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Title:
MULTI-PLY SEPARABLE INTERLACED YARNS, METHODS FOR MANUFACTURING THEREOF AND WOVEN TEXTILE FABRICS THEREOF
Document Type and Number:
WIPO Patent Application WO/2019/038784
Kind Code:
A1
Abstract:
The disclosure provides a multi-ply separable interlaced yarn having at least one filament yarn of 3-9 denier, a multi-ply separable interlaced yarn made of bio- polymer including poly-lactic acid, a woven textile fabric having a thread count more 2000 threads per square inch, a woven textile fabric having thread count more 400 threads per square inch and comprising plurality of bio polymer multi-ply separable interlaced filament yarns as weft yarns, a method for manufacturing a multi-ply separable interlaced filament yarn from poly-lactic acid polymer and a method for manufacturing a multi-ply separable interlaced filament yarn having interlacing at a pressure in a range of 7-14 bar.

Inventors:
GUPTA RONAK RAJENDRA (IN)
Application Number:
PCT/IN2018/050539
Publication Date:
February 28, 2019
Filing Date:
August 21, 2018
Export Citation:
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Assignee:
GUPTA RONAK RAJENDRA (IN)
International Classes:
D02G1/00; D02G1/18; D02G1/20; D02J1/08; D03D13/00; D03D15/00
Foreign References:
IN285236B
US20120132309A12012-05-31
US8186390B22012-05-29
EP1058745B12002-02-06
US20150259831A12015-09-17
US8317826B22012-11-27
CN105970315A2016-09-28
US5665293A1997-09-09
US20110133011A12011-06-09
Attorney, Agent or Firm:
SHETH, Girish Vijayanand (IN)
Download PDF:
Claims:
C L AIM S

1. A multi-ply separable interlaced yarn comprising a plurality of filament yarns, wherein at least one filament yarn comprises a plurality of filaments separably interlaced to each other and has a denier in a range from 3 to 9.

2. The multi-ply separable interlaced yarn as claimed in claim 1, wherein the multi-ply separable yarn is a textured yarn.

3. The multi-ply separable interlaced yarn as claimed in claim 1 or claim 2, wherein the multi-ply separable yarn is a polymeric material including a polyester, polyamide, polypropylene, polytri methylene terephthalate, Polybutylene terephthalate, etc.

4. A multi-ply separable interlaced yarn comprising a plurality of filament yarns, wherein at least one filament yarn comprises a plurality of filaments separably interlaced to each other and has a denier ranging from 3 to 32, wherein the multi-ply separable yarn is made of bio-polymer including poly- lactic acid.

5. The multi-ply separable interlaced yarn as claimed in claim 4, wherein the multi-ply separable yarn is a textured yarn.

6. A woven textile fabric having a plurality of warp and weft yarns, the fabric comprising a plurality of multi-ply separable interlaced yarns as weft yarns, said yarns having a denier in a range from 3-9 providing the woven fabric havi ng a thread count more 2000 threads per square i nch.

7. The woven textile fabric as claimed in claim 6, wherein the multi-ply separabl e yarn is a textured yarn.

8. A woven textile fabric having a plurality of warp and weft yarns, said fabric comprising a plurality of multi-ply separable interlaced filament yarns made of bio-polymer including poly-lactic acid as the weft yarns, wherein the yarns have a denier in a range from 3 to 32 for providing the fabric having thread count more 400 threads per square inch.

9. The woven textile fabric as claimed in claim 8, wherein the multi-ply separabl e yarn is a textured yarn.

10. A method for manufacturing a multi-ply separable interlaced filament yarn from poly-lactic acid polymer comprising steps of:

melting poly- lactic acid polymer;

passing melt of poly-lactic acid polymer through a spinning unit to form plurality of molten streams at a temperature between 220-280 deg C;

cooling the molten streams in a quenching zone to form a plurality of bio- polymer filaments;

interlacing the bio-polymer filaments to form a separable interlaced filament bio- polymer yarn and

converging two or more separable interlaced filament bio- polymer yarns to provide a multi-ply separable interlaced filament bio- polymer yarn;

wherein the step interlacing includes grouping of 7-24 filaments to form a multi-ply interlaced separable filament bio-polymer yarn in a range from 3 to 32 denier.

11. A method for manufacturing a multi-ply separable interlaced filament yarn comprising steps of:

melting a polymeric material;

passing melt of polymeric material through a spinning unit to form plurality of molten streams;

cooling the molten streams in a quenching zone to form a plurality of polymer filaments; interlacing the filaments to form a separable interlaced filament polymer yarn at a pressure i n a range from 7- 14 bar; and

converging two or more separable interlaced filament yarns to provide a multi - ply separabl e i nterl aced f i I ament yarn;

wherein the step interlacing includes grouping of 7-24 filaments to form a multi -ply interlaced separable filament yarn from 3 to 9 denier.

AMENDED CLAIMS

received by the International Bureau on 29 Dec 2018(29.12.2018)

1. A multi-ply separable interlaced yarn comprising a plurality of filament yarns, wherein at least one filament yarn comprises a plurality of filaments separably interlaced to each other and has a denier ranging from 3 to 32, wherein the multi-ply separable yarn is made of bio-polymer including poly-lactic acid.

2. The multi-ply separable interlaced yarn as claimed in claim 1, wherein the multi-ply separable yarn is a textured yarn.

3. A woven textile fabric having a plurality of warp and weft yarns, the fabric comprising a plurality of multi-ply separable interlaced yarns as weft yarns, said yarns having a denier in a range from 3-9 providing the woven fabric having a thread count more 2000 threads per square inch.

4. The woven textile fabric as claimed in claim 3, wherein the multi-ply separable yarn is a textured yarn.

5. A woven textile fabric having a plurality of warp and weft yarns, said fabric comprising a plurality of multi-ply separable interlaced filament yarns made of bio-polymer including poly-lactic acid as the weft yarns, wherein the yarns have a denier in a range from 3 to 32 for providing the fabric having thread count more 400 threads per square inch.

6. The woven textile fabric as claimed in claim 5, wherein the multi-ply separable yarn is a textured yarn.

7. A method for manufacturing a multi-ply separable interlaced filament yarn from poly-lactic acid polymer comprising steps of:

melting poly-lactic acid polymer; passing melt of poly-lactic acid polymer through a spinning unit to form plurality of molten streams at a temperature between 220-280 deg C;

cooling the molten streams in a quenching zone to form a plurality of bio- polymer filaments;

interlacing the bio-polymer filaments to form a separable interlaced filament bio-polymer yarn and

converging two or more separable interlaced filament bio-polymer yarns to provide a multi-ply separable interlaced filament bio-polymer yarn;

wherein the step interlacing includes grouping of 7-24 filaments to form a multi-ply interlaced separable filament bio-polymer yarn in a range from 3 to 32 denier.

8. A method for manufacturing a multi-ply separable interlaced filament yarn comprising steps of:

melting a polymeric material;

passing melt of polymeric material through a spinning unit to form plurality of molten streams;

cooling the molten streams in a quenching zone to form a plurality of polymer filaments;

interlacing the filaments to form a separable interlaced filament polymer yarn at a pressure in a range from 7-14 bar; and

converging two or more separable interlaced filament yarns to provide a multiply separable interlaced filament yarn;

wherein the step interlacing includes grouping of 7-24 filaments to form a multi-ply interlaced separable filament yarn from 3 to 9 denier.

Description:
M UL TI-PLY SE PARA BL E INT E R L AC E D YARNS, M E T H ODS FOR MA NUFACT U RING T H E R E OF A ND WOV E N T EXTIL E FABRICS

T H E R E OF

The present disclosure is the Patent of addition to the Patent application number 201621014375 dated 25 th April, 2016. The patent has been granted to the parent application vide patent number 285236 on 14.07.2017.

T E C H NICAL FIE L D

The present disclosure relates to the field of textiles. More particularly, the present disclosure relates to multi-ply separable filament yarns and multi-ply separable textured yarns and a method to manufacture it.

BAC K G ROU ND

Textile manufacturing industry includes conversion of fiber or filaments into yarn and from yarn to fabric that is further processed.

Conventionally, filament yarn is produced by melting and extrusion of polymer chips in an extruder or directly from polymer melt coming from a continuous polymerization plant. Polymer may be a polyester, polyamide, polypropylene, polytri methylene terephthalate, Polybutylene terephthalate, etc. Polymer melt is pressed through holes in spinnerets to form streams that are quenched to form filaments. The filaments are grouped to form a filament yarn with desired evenness, strength, shrinkage, elongation and other properties. During the processing, the filament yarns may be oriented or drawn to form low, medium, partially, high, fully oriented or fully drawn yarn.

The filament yarns are put through an additional process called texturing or texturizing ( ' Texturizing Process ) to give texture, crimp, bulk, strength to the filament yarn and to vary its look and feel. Textured filament yarn includes draw textured yarn and air textured yarn (together ¾ DTY _) etc. In the texturizing process, the filament yarn is given an texture either by false twisting in an false twist unit wherein twisting and detwi sting takes place or by an fluid like air. Textured yarn is mainly used in weaving & knitting of fabrics for making clothes outer/inner garments, skin-clinging garments, home furnishings, seat covers, bags upholstery, bed sheets and many other uses.

' Plying , is done by taking two or more strands of yarn (filament yarn or a textured yarn) and putting them together.

" Multi-ply yarns , as referred herein are basically two or more yarns plyed together. Each yarn in the multi-ply may be referred to as a ply. Multi-ply yarns may be untwisted or unplyed to an individual ply.

" Interlaced yarns.: The yarns during processing may be passed through interlacing jets to interlace the filaments within the yarn. Such yarns are referred herein as " Interlaced yarns_. Interlacing helps to bind the filaments within the yarns.

" Separable interlaced yarn_ as referred herein is a single ply interlaced yarn and that can be split/ unplyed from the multi-ply yarns.

" N on- separable yarn_ as referred herein is single ply yarn that cannot be split/ unplyed from the multi-ply yarns.

" Multi-ply separable interlaced filament yarn_ as referred herein is a multi-ply yarn that is separable in to at least two separable interlaced filament yarn, wherein the interlacing of the filaments within each separable interlaced filament yarn is retained during further processing of the yarn to fabric and in the fabric.

" Multi-ply separable textured yarn , as referred herein is a multi-ply yarn that is separable in to at least two separable interlaced textured yarn, wherein the interlacing of the filaments within each separable interlaced draw textured yarn is retained during further processing of the yarn to fabric and in the fabric.

Separable interlaced yarns are used amongst other in bed sheets wherein fine and super fine separable interlaced yarns are used to increase the thread count of the fabric.

Thread count is the number of threads woven into one square inch of fabric. This number is based on the threads woven horizontally ("weft") and vertically ("warp"). Weft insertions in an fabric are called as " picks , . Thread count is increased by using multi-ply separable draw textured yarns and inserting in the weft. For example a Thread count of 1100 could be formed by taking 200 yarns per inch of any material in the warp say 50s cotton and inserting in weft 75 picks per inch in the weft and each pick will have 12 ply separable textured yarn. So, the weft would have 900 (75*12) yarns per inch and total thread count is 1100 (900+200). Accordingly the warp may also have multi-ply separable yarns to achieve very high thread counts.

For manufacturi g multi-ply separable draw textured yarn in conventional processes, filament yarn is fed through a feed roller and passed through a heater, cooling plate and a false-twist unit having disks where the twisting and de- twisting, also known as false twisting takes place at a high speed. The yarn is further passed through an intermediate roller or a :draw roller " . The draw roller draws the yarn while it is heated in the primary heater and getting twisted and de- twisted in the false-twist unit. This gives the yarn the required bulkiness or f I uff i ness, al so referred to as texturi z i ng. T he yarn comi ng out of the draw rol I er i s called as textured yarn. The yarn is then passed through interlacing jets to i nterlace the fi laments withi n the yarn.

In order to make separable texturized yarns, two or more texturized yarns are wound/plied/grouped together in a single bobbin after passing through an interlacing process. Since the filaments of each yarn are interlaced, each yarn ply gets separated resulting in multi-ply separable textured yarns.

On an industrial scale the textured yarns are produced on a textured machine. In a texture machine there are " X _ number of spindles, and " X _ number of textured packages are formed at a time if no plying is done. When, plying is done for making multi-ply separable texturized yarns, the number of packages formed at a time is ' X _ divided by the number of plies. If " n_ ply separable textured yarns are made having d_ denier of ply yarns, then the number of textured yarn packages that is made is X/n. This requires _ number of filament yarn packages and the denier of the wound yarn is d*n. However, if one ply breaks, the other remaining ply or plies are also required have to be broken, which makes the industrial process inefficient.

The US20110133011 A1 document title ^ Multiend package of multifilament polyester bi-component yarn_. The document discloses multiend packages of multi component yarns, where the yarn is separable into individual ends upon unwinding. The multi component yarn may be a bi-component yarn, such as a yarn including compositional ly different polyesters in a side-by-side or eccentric sheath-core configuration. The document further discloses a process for producing a multiend package, wherein the process comprises melt-spinning two or more compositional ly different polyesters from a single pre- coal esc ent or post- coalescent spinneret to form multiple side-by-side or eccentric sheath-core polyester bi-component filaments

Thus the conventional system and/or method of manufacturing multi-ply separable textured yarn has inherent issues such as low productivity, high production cost per kilogram of yarn of a particular denier, and poor capability produce low/fine and ultra-low/fine denier yarns.

SUM MA RY

Accordingly, the present disclosure provides means to solve at least one of the aforementioned problems through its various aspects and embodiments.

In the first aspect provided herein is a multi-ply separable interlaced yarn comprising a plurality of filament yarns, wherein at least one filament yarn comprises a plurality of filaments separably interlaced to each other and has a denier in a range from 3 to 9. According to an embodiment the multi-ply separable yarn can be a textured yarn and is a polymeric material including a polyester, polyamide, polypropylene, polytri methylene terephthalate,

Polybutyleneterephthalate, etc.

The second aspect provides a multi-ply separable interlaced yarn comprising a plurality of filament yarns, wherein at least one filament yarn comprises a plurality of filaments separably interlaced to each other and has a denier ranging from 3 to 32, wherein the multi-ply separable yarn is made of bio-polymer including poly-lactic acid. According to an embodiment, the yarn can be a textured yarn.

In third aspect provided herein is a woven textile fabric having a plurality of warp and weft yarns, the fabric comprising a plurality of multi-ply separable interlaced yarns as weft yarns, said yarns having a denier in a range from 3-9 providing the woven fabric having a thread count more 2000 threads per square inch. Advantageously, the multi-ply separable yarn can be a textured yarn.

In forth aspect, it is provided herein is a woven textile fabric having a plurality of warp and weft yarns, said fabric comprising a plurality of multi-ply separable interlaced filament yarns made of bio-polymer including poly-lactic acid as the weft yarns, wherein the yarns have a denier in a range from 3 to 32 for providing the fabric having thread count more 400 threads per square inch. Advantageously, the multi-ply separable yarn can be a textured yarn.

In fifth aspect, provided herein is a method for manufacturing a multi-ply separable interlaced filament yarn from poly-lactic acid polymer comprising steps of: melting poly-lactic acid polymer, passing melt of poly-lactic acid polymer through a spinning unit to form plurality of molten streams at a temperature between 220-280 deg C, cooling the molten streams in a quenching zone to form a plurality of bio-polymer filaments, interlacing the bio-polymer filaments to form a separable interlaced filament bio-polymer yarn and converging two or more separable interlaced filament bio-polymer yarns to provide a multi-ply separable interlaced filament bio-polymer yarn. According to an embodiment, the step interlacing includes grouping of 7-24 filaments to form a multi-ply interlaced separable filament bio- polymer yarn in a range from 3 to 32 denier.

Sixth aspect provides method for manufacturing a multi-ply separable interlaced filament yarn comprising steps of melting a polymeric material, passing melt of polymeric material through a spinning unit to form plurality of molten streams, cooling the molten streams in a quenching zone to form a plurality of polymer filaments, interlacing the filaments to form a separable interlaced filament polymer yarn at a pressure in a range from 7-14 bar and converging two or more separable interlaced filament yarns to provide a multi-ply separable interlaced filament yam. According to an embodiment the interlacing step includes grouping of 7-24 filaments to form a multi-ply interlaced separable filament yarn from 3 to 9 denier.

B RIE F DE SC RIPT ION OF T H E AC COM PANY ING DRAWING

Characteristics and advantages of the subject matter as disclosed i the present disclosure will become clearer from the detailed description of an embodiment thereof, with reference to the attached drawing, given purely by way of an example, in which:

FIGU RES 1 and 2 illustrate examples of conventional filament yarn manufacturing;

FIGU RES 3A , 3 B and 3C ill ustrate vari ous types of i nterl ac i ng of yarns;

FIGU RES 4 illustrate example of manufacturing separable interlaced filament yarn using a system and method in accordance with the present disclosure;

FIGU RES 4A, 4B, 4C, 5A, 5B and 5C illustrate various examples of manufacturing multi-ply separable interlaced filament yarn in a productive manner usi ng a system and method in accordance with the present disclosure; FIGU RES 6A, illustrate an example of manufacturing multi-ply separable textured yarn using a conventional system;

FIGU RES 6B and 6C, illustrate an example of manufacturing multi-ply separable textured yarn in a productive manner using a system and method in accordance with the present disclosure; and

FIGU RES 7, illustrates a significant gain in Output and Capability by using the system and method of manufacturing in accordance with the present disclosure compared to the conventional way.

The present disclosure will now be described with reference to the following non- I i mi ti ng embodi merits.

DE TAIL E D DE SC RIPTION

The disclosure will now be described with reference to the accompanying embodiments which do not limit the scope and ambit of the disclosure. The description provided is purely by way of example and illustration.

The novel added features of the patent of addition application described as under in addition to the novel inventive features claimed and described in the parent application.

According to disclosure the additional embodiments and/or aspects with respect to the Patent of additions are a multi-ply separable interlaced yarn having at least one filament yarn of 3-9 denier, a multi-ply separable interlaced yarn made of bio- polymer including poly-lactic acid, a woven textile fabric having a thread count more 2000 threads per square inch, a woven textile fabric having thread count more 400 threads per square inch and comprising plurality of bio polymer multiply separable interlaced filament yarns as weft yarns, a method for manufacturing a multi-ply separable interlaced filament yarn from poly-lactic acid polymer and a method for manufacturing a multi-ply separable interlaced filament yarn having interlacing at a pressure in a range of 7-14 bar.

Figures 1 and 2 illustrate conventional method of manufacturing filament yarn, wherein polymer melt is received in a spinning unit (100) via an inlet line (104) and is pressurized or extruded with a melt pump (102) through nozzles (two or more in numbers) in spinnerets (110) placed in a spin pack (108). This results in the generation of two or more polymer filaments (114). These filaments (114) are cooled in a quenching chamber (112) with air in order to solidify. The solidified filaments (114) are bunched in groups of two or more to make a yarn (120).

As shown in the embodiment illustrated in Figure 1, ten filaments (114) are grouped to make one filament yarn (120). In this way, ten yarns (120) are formed. In this embodiment, there is one spi n pack ( 108) and hence one spi nneret (110) for maki ng one f i I ament yarn ( 120) . T he f i I ament yarns ( 120) are passed through spi n f i ni sh oi I appl i cator ( 118) , spi n f i ni sh oi I is appl i ed on the yarns ( 120) usi ng a spi n finish pump and spin finish application nozzles to give it oiling/greasing. Spin finish may also be applied using a roller dipped in spin finish oil. The polymer filaments used in accordance to the present invention are not side- by-side or seath-core bi-component fi lament.

Y arns may also be plied, i.e., multiple yarns wound or grouped together on a single bobbin to increase the denier of each yarn, or increase the filaments per yarn or improve the quality of the yarn. In this embodiment two filament yarns (120) are plied together to form a 2-ply filament yarn. In this way, five 2-ply filament yarns are formed.

The plied yarns are passed through one or more enclosure/device referred to as interlacing/ migration/ interlacing/ comingling/ fluid jets/ nozzles (124), (130), and (132) ( " Interlacing J et_). In the interlacing jet the filaments of the yarn are subjected to a pressured fluid passed through one or more nozzles from fluid inlet pi pe ( 126), to achi eve one or more of the f ol I owi ng obj ects: I Interlacing of filaments with each other;

Comingling of filaments with each other;

I E qual distribution of spin finish oil across the yarn;

K notti ng of f i I aments i n a yarn.

I Binding of filaments in a yarn.

C onventionally, interlacing is carried out at fluid pressure of 1 to 3 bar for filament yarns. Interlacing results in better processing speeds in filament yarn manufacturing, improves bobbin package build, even distribution of spin finish, reduces filaments and yarn breaks.

In Figure 1, the interlaced yarns are represented by B. In different embodiments, the number of interlacing jets per yarn may vary in the entire yarn path (nil to many). In Figure 1 such varying sets of interlacing jets are shown.

When the plied yarns are passed through the interlacingj et (124, 130, 132) having sufficient fluid pressure, the filaments of the yarn plies intermingle/bind and become a singular yarn, the plies of which are non- separable. In Figure 1, non- separable filament yarns are formed as the yarns are plied before interlacing.

The interlaced yarns are passed through separator rollers (also referred to as godets). Preferably, two such separator rollers (128), (134) are provided for good quality of filament yarn. The number of separator rollers, however, may vary depending upon the requirement. The separator rollers help achieve the following objectives amongst others:

I Provide stability to yarns and assist drawing or underfeeding or over feeding the yams;

A dj ustment of yarn tensi on;

Finally, the interlaced yarns are sent to a winder (136) provided with one or more bobbins (also referred to as tubes or cones) (140). Each interlaced yarn is wound around a discrete bobbin. The winder may have a capacity to wind yarn on 10 bobbins at a time. Reference numeral (138) denotes the number of bobbi s (140) of yarn wounded i each case.

Figure 2 illustrate manufacturing of the filament yarns without plying to form filament yarn. In this embodiment, five filament yarns are formed. In this embodiment, the filaments of yarn are subjected to pressurized fluid between 1 to 3 bar in the interlacing jets, resulting in interlaced yarns and are wound directly. In this embodiment, 5 single interlaced filament yarns are wound onto 5 bobbins.

Figures 3A, 3B, and 3C illustrate effects of intermingling or interlacing of filaments of a yarn, when the yarn is passed through the interlacing jet having pressured fluid jet. In said Figures, an arrow head represents the flow of pressurized fluid through a nozzle or Interlaci g J et (124), (130), (132), shown as a block. This results in knotting or intermingling or interlacing or comingling or bonding of the filaments of yarn. The intensity or strength of interlacing can be varied with amongst others, the changing of fluid pressure, nozzle diameter and the number of nozzles, nozzle angle, etc.

On an industrial scale, a filament yarn manufacturing system has plurality of winders 136. Production of a filament yarn line is given by the following formula at 100% Efficiency:

Production per day in Kgs per Line = Number of winders * Number of bobbins wound at a time * Denier of wound yarn * Speed (meters per minute - mpm) * 60 (min) * 24 (hours)/ 9000000.

It has been found that the multi-ply filaments yarns produced in accordance with the prior art are not separable in to individual yarns after further process like texturizing and in fabric after processing when unplyed or ungrouped.

In the present disclosure, there is provided a method of manufacturing a separable interlaced filament yarn, the method comprising:

a) melting a polymeric material

b) passing the polymer melt through a spinning unit to form a plurality of molten streams;

c) cooling the molten streams in a quenching zone to form plurality of polymer filaments; wherein said polymer filaments are not side-by-side or seath-core bi- component filament;

d) interlacing the filaments to form a separable interlaced filament polymer yarn at a pressure in a range from 7-14 bar wherein the step interlacing includes grouping of 7-24 filaments to form a multi-ply interlaced separable filament yarn from 3 to 9 denier; and

e) converging two or more separable interlaced filament yarns to provide a multi-ply separable interlaced filament yarn.

The present disclosure also provides a method of manufacturing a separable interlaced filament yarn from poly-lactic acid polymer wherein the method comprises steps of

a) melting poly-lactic acid polymer;

b) passing melt of poly-lactic acid polymer through a spinning unit to form plurality of molten streams at a temperature between 220-280 deg C; c) cooling the molten streams in a quenching zone to form a plurality of bio- polymer fi laments;

d) interlacing the bio- polymer filaments to form a separable interlaced filament bio-polymer yarn and

e) converging two or more separable interlaced filament bio- polymer yarns to provide a multi-ply separable interlaced filament bio-polymer yarn.

According to this method, the step interlacing includes grouping of 7-24 filaments to form a multi-ply interlaced separable filament bio-polymer yarn i n a range from 3 to 32 denier. Figure 4 illustrate the manufacturing method of separable interlaced filament yarn using method in accordance with the present disclosure.

As illustrated in figure 4, the polymer melt including bio-polymer is received in a spinning unit (100) via an inlet line (104) and is pressurized or extruded with a melt pump (102) through nozzles (two or more in numbers) in spinnerets (110) placed in a spin pack (108). This results in the generation of two or more polymer filaments (114). These filaments (114) are cooled in a quenching chamber (112) with air in order to solidify. The solidified filaments (114) are bunched in groups of two or more to make a yarn (120). Ten filaments (114) are grouped to make one filament yarn (120). In this way, ten yarns (120) are formed. The filament yarns (120) are passed through spin finish oil applicator (118), spin finish oil is applied on the yarns (120) using a spin finish pump. The yarns are then passed through one or more enclosure device referred to as interlacing/ migration/ interlacing/ comingling/ fluid jets/ nozzles (124), (130), and (132) ( ' Interlacing J et_). In the interlacing jet the filaments of yarn are subjected to a pressured fluid passed through one or more nozzles from fluid inlet pipe (126), to achieve one or more of the f ol I owi ng obj ects:

I Interlacing of filaments with each other;

I Comingling of filaments with each other;

I E qual distribution of spin finish oil across the yarn;

I K notti ng of f i I aments i n a yarn.

I Binding of filaments in a yarn.

Interlacing results in better processing speeds in further processing, improves bobbin package build, even distribution of spin finish, reduces filaments and yarn breaks. Separable interlaced filament yarn is formed by interlacing in such a way that the interlacing remains in further processing of yarn and in the fabric. In this figure, separable interlaced filament yarns are represented by D. In different embodiments, the number of interlacing jets per yarn may vary in the entire yarn path. The interlacing may include grouping of 7-24 filaments to form a multi-ply separabl e f i I ament yarn. The interlaced yarns may be passed through separator rollers (also referred to as godets). Preferably, two such separator rollers (128), (134) are provided for good quality of filament yarn. The number of separator rollers, however, may vary depending upon the requirement. The separator rollers help achieve the following objectives amongst others:

I Provide stability to yarns and assist drawing or underfeeding or over feeding the yams;

A dj ustment of yarn tensi on;

Finally, the yarns are sent to a winder (136) provided with one or more bobbins (also referred to as tubes or cones) (140). Each yarn is wound around a discrete bobbin. The winder has a capacity to wind yarn on 10 bobbins at a time. Reference numeral (138) denotes the number of bobbins (140) of yarn wounded in each case.

In one embodiment of the present disclosure, the separable interlaced filament yarn is converged with at least one more separable interlaced filament yarn to provide a multi-ply separable interlaced filament yarn.

In case of bio-polymer including poly-lactic acid polymer, the spinning unit is operated at a reduced temperature preferably between 220-280 deg C.

Figures 4A, 4B and 4C illustrate various examples of manufacturing multi-ply separable interlaced filament yarn using a system and method in accordance with the present disclosure.

In relation to the set of Figures 4A, 4B and 4C, the structural features of the spinning unit (200), common to the spinning unit (200), are obviated for the sake of brevity. The plying of the filament yarn as illustrated in figures 4A, 4B and 4C is done after passing them through at least one interlacing jet (124, 130, and 132) where the combination of fluid pressure, nozzle size, number of nozzles are used in a way that very strong interlacing (bondi ng/ intermingli ng/ comingling/ entangling) between the filaments of a yarn ply takes place and the interlacing does not open during further processing on a texturizing machine and i n fabric resulting in separable interlaced filament yarn.

Following are the examples of interlacing done for different denier of Polymers in accordance with the present disclosure the interlacing of which is significantly retained after Texturizing Process and also in the fi nished fabric:

POY

Polyester

14 POY 3000 1.4 4.2 1 Air Yes 129%

Polyester

14 POY 3000 1.6 3.8 1 Air Yes 129%

Polyester

14 POY 3000 1.2 2.0 1 Air No 135%

Polyester

10 POY 3000 1.2 5.5 1 Air Yes 132%

Polyester

10 POY 3000 1.4 5.0 1 Air Yes 132%

Polyester

10 POY 3000 1.2 1.2 1 Air No 138%

Polyester

14 POY 3000 1.2 4.5 1 Air Yes 125%

Polyester

14 POY 3000 1.4 4.0 1 Air Yes 124%

Polyester

14 POY 3000 1.6 3.7 1 Air Yes 124%

Polyester

14 POY 3000 1.2 1.4 1 Air No 128%

Polyester

7 POY 3000 1.2 5.0 1 Air Yes 130%

Polyester

7 POY 3000 1.4 4.3 1 Air Yes 129%

Polyester

7 POY 3000 1.4 1.2 1 Air No 132%

Polyamide

14 6 POY 3750 1.2 6.0 1 Air Yes 55%

14 Polyamide 3750 1.4 5.5 1 Air Yes 54% 6 POY

Polyamide

14 6 POY 3750 1.4 1.2 1 Air No 55 %

Polyamide

12 6 POY 3650 0.9 6.5 1 Air Y es 50 %

Polyamide

12 6 POY 3650 1.2 5.5 1 Air Y es 51 %

Polyamide

12 6 POY 3650 1.2 1.6 1 Air No 51 %

Polyamide

07 6 POY 3700 1.2 7.0 1 Air Y es 55 %

Polyamide

07 6 POY 3700 1.2 1.8 1 Air No 55 %

The above are only examples and the parameters may vary depending on spinning machine, filament yarn type, process speeds, nozzle dia, nozzle angle, fluid used, number of nozzles and various other factors.

In Figures 4A, 4B, and 4C, multi-ply separable interlaced filament yarn at various stages are represented by E, G, and I. In accordance to the disclosure, the multiply interlaced filament yarn can be manufactured with 3 to 9 denier in addition to the denier claimed in the parent patent/ application. Further, the disclosure also allows to manufacture a multi-ply interlaced filament bio-polymer yarn having denier in the range from 3-32.

In Figure 4A, there is grouping of two separable interlaced filament yarn represented by _ between the separator roller (134) and the winder (136), after the interlacing jet (132) to form a 2- ply separable interlaced yarn as represented by Έ ..

In Figure 4B, there is a grouping of two separable interlaced filament yarns represented by " F_ between two separator roller (128) and (134), after the interlacing jet (130) to form a 2-ply separable interlaced yarn as represented by

In Figure 4C, there is a grouping of two separable interlaced filament yarns represented by Ή _ between the quenching chamber (112) and the separator roller (134), after the interlacing jet (124) to form a 2-ply separable interlaced yarn as represented by " I_.

In Figures 4B and 4C, the migration block (302) is either treated as a : bypass " block having no or very little fluid pressure. The interlacing jets (124, 130, and 132) can be placed at any location in the entire yarn path between the spinnerets (110) and the winder (136), for example, as shown in Figure 4A.

In an embodiment, fluid pressure in the interlacing jets (124, 130, 132) may also be increased/decreased and/or a nozzle diameter of the interlacing jet (124, 130, 132) may be increased/decreased to achieve more strong and effective interlacing of the filaments before plying. Due to this, the filaments of one yarn ply do not mix with the filaments of another yarn ply during processing, and results in a multi-ply, separable filament yam. In each of the cases shown in Figures 4A, 4B and 4C, five packages of 2-ply/ separable interlaced filament yarns are formed. The present disclosure allows to raise the interlacing pressure in a range of 7-14 bar.

With this process, the output of a particular line producing a particular denier of a ply can be increased manifolds by just increasing the number of interlacing jets in the yarn path. The number of spin finish application nozzles (118) may be increased as necessary. The capital investment of doing this is very low compared to the conventional filament yarn manufacturing process. Further, the increased output also results in reduced production cost per kg of yarn of a particular denier. In fact, the more the number of plies of yarns of a particular denier, more the capacity in a single li e.

As shown in Figures 5A and 5B, the output of a particular denier (before plying) at a particular speed is doubled as compared to system shown in Figures 4A, 4B, and 4C by just doubling the number of the interlacing jet (124, 130, 132) and spin finish application nozzles (118).

In Figure 5C, the output is quadrupled as compared to the rest. Thus, in accordance with the process of the present disclosure, the output can be made triple or five times or :x~ times. In Figures 5A, 5B, and 5C, separable interlaced filament yarn at various stages are represented by K, M and O.

In Figure 5A, J represents two separable interlaced filament yarn grouped between the quenching chamber (112) and the separator roller (134), after the interlacing jet (124) to form a 2- ply separable yarn represented by Ί _.

In Figure 5B, L represents four separable interlaced filament yarn grouped between the quenching chamber (112) and the separator roller (134), after the interlacing jet (124), to form a 4-ply separable interlaced yarn represented by

In Figure 5C, N represents four separable interlaced filament yarn grouped between the quenching chamber (112) and the separator roller (134), after the i nterl ac i ng j et ( 124) , to f orm a 4- pi y separabl e i nterl aced represented by Ό _ .

In the embodiments as illustrated in the Figures 5A, 5B and 5C, production of ten packages of 2-plyseparable interlaced filament yarn, five packages of 4-ply separable interlaced filament yarn, and 10 packages of 4-ply separable interlaced filament yarn are shown.

Further, by using this method and increasing the output for a multi-ply separable interlaced filament yarn, it would also be possible to make fine and ultra-fine denier yarns up to 3 denier per yarn ply, which is a not possible using conventional technique due to the limitations of a minimum melt pump throughout, high residence time.

In a process for manufacturing multi-ply separable textured yarn using conventional processes (Figure 6A), a filament yarn package (202) is placed on a filament yarn stand creel of a texturizing/DTY machine and filament yarn (203) is fed through a primary input roller (206) or feed roller. Through a primary heater (208), the filament yarn is oriented and is passed on a cooling plate (210). The cooled yarn is then passed through a false twist unit (212) having disks in which twisting and de-twisting, also known as false twisting, takes place at high speed. A twist unit is also called as a :texturizing spindle " and the capacity of such a machine depends on the number of spindles it has. The yarn is further passed through an intermediate roller (214) or a :draw roller. " The draw roller draws the yarn while it is heated in the primary heater and getting twisted and de- twisted in the false- twist unit. This gives the yarn the required bulkiness or fluffiness, also referred to as ' texturize_. The yarn coming out of the draw roller is called as DTY or textured yarn (222).

The interlacing (if any) in filament yarn in the conventional method gets majorly opened during the texturing process, as it is very weak. Interlacing of the filament yarn barely remains and not seen in the texturing process. High interlacing is then done on the Texturizing Machine with interlacing/intermingling jets (215) for getting the filaments of yarn interlaced/intermingled/knotted. The yarn is further optionally passed through a secondary heater (216) where the properties of the yarn, such as shrinkage, bulkiness, twist, dyeing, and affinity, are stabilized with the help of an output roller (218). Further, oil is optionally applied through an oi I i ng rol I er (220) or an oi I appl i cati on nozz I e whi ch acts I i ke a grease for the yarn enabling good performance in end uses of yarn. Finally, two or more yarns (222) are grouped/plied to form multi-ply separable textured yarns (239) and wound onto a tube to create a multi-ply separable textured yarn package (240).

In Figure 6A there are 2 spindles of texturizing machine and a 2 Ply Separable textured yarn package (240) is formed.

The production of a texturizing machine is given by the following formula at 100% Efficiency:

Production per day in Kgs = Number of bobbins wound at a time* Denier of wound yarn * Speed (m/min) * 60 (min)*24 (hours)/ 9000000.

In a texturized machine if there are _ number of spindles, then " X _ number of bobbins would wound at a time if no plying is done in machine. If plying is done for making multi-ply separable texturized yarns, then the number of bobbins wound at a time is " X _ divided by the number of plies :n " . If :n " ply separable textured are made having :d " denier of each ply, then the number of textured yarn package that would be made at a time will be :X/n " . This would require :X " filament yarn packages. Further, the denier of the wound yarn would be d*n.

Disadvantage associated with such process is that if one ply breaks, the other remaining ply or plies would also have to be broken, which is not efficient also process speeds are much si ower for f i ner deni ers of yarns.

The system/method of manufacturing multi-ply, separable textured yarn, in accordance with the present disclosure, aims to resolve amongst others issues of low production and low productivity associated with conventional yarn manufacturing.

Present disclosure provides a method for manufacturing a multi-ply separable textured yarn, the method comprising:

i. passing a multi-ply separable interlaced filament yarn through a texturizing unit to form a multi-ply separable draw textured yarn, wherein the multi-ply separable interlaced filament yarn is separable in to at least two separable interlaced filament yarn, wherein the interlacing of the filaments within each separable interlaced filament yarn is retained during further processing of the yarn to fabric and in the fabric.

As illustrated in figure 6B, 2 spindles of a texturizing machine is having an output 2 packages (250) of 2- ply separable textured yarns (239) by using 2-ply separable interlaced filament yarns (253) from 2 packages (252).

In one embodiment of the present disclosure, the multi-ply separable interlaced filament yarn is formed by converging at least two separable interlaced filament yarn.

As illustrated in figure 6C, 2 spindles of a texturizing machine is having an output 2 packages (250) of 2-ply separable textured yarns (239) by using 2-ply separable interlaced filament yarn (253) from 4 packages of separable interlaced filament yarn(252).

As illustrated in Figure 6C, total 4 packages of separable interlaced filament yarn are used on 2 spindles to form two numbers of 2-ply separable textured yarns. Likewise the output would be of 4- ply separable textured yarns (239) per spindle if two numbers of 2- ply separable interlaced filament yarn (255) would be used for each spindle and output would be 8-Ply separable textured yarns (239) per spindle if two numbers 4-ply separable interlaced filament yarn(255) would be used for each spi ndle.

The advantage in the present method of yarn manufacturing is due to the strong binding or interlacing of the filaments of each yarn ply of the resulting interlaced separable filament yarn manufactured in accordance with the present disclosure, which does not completely open and remains during the texturizing process and also the fabric after the fabric is made and finished. Further, each ply remains separate after texturizing and even in the fabric. Moreover, unlike the conventional textured yarn manufacturing process, here, it is important not to give high interlacing by i terlacing jet (215) on the texturizing machine as all filaments of the pi i es of the yarn woul d get i ntermi ngl ed and woul d not remai n separabl e.

To achieve less interlacing, in the present technique of manufacturing, either the fluid pressure is decreased or the interlacing jet nozzle size is decreased.

The present method results in significant increase in production of textured yarns and results in huge cost saving as compared to the conventional process of plying the yarns in texturizing. Further, the efficiency is more in this process, as a ply breakage does not hamper the whole yarn. Furthermore, increased speeds are used as the denier to be processed per spindle increases.

In one embodiment of the disclosure, at least one multi-ply separable textured yarn is converged with at least one multi-ply separable textured yarn to increase the number of plies and denier.

Figure 7 illustrates a significant gain in Output and Capability by using the system and method of manufacturing in accordance with the present disclosure compared to the conventional way.

As shown in table in Column 7A 1 for producing 20 Denier 2-ply separable interlaced textured yarn using the conventional method, a two 32 denier filament yarns having elongation in range of 125-150 as per conventional process are made at process speed of 3000 MPM and texturized on a texturized machine at draw ratio of 1.7 at process speed of 750 MPM to yield two textured yarn of 20 denier per spindle which are then highly interlaced and finally 2 textured yarns from 2 spindles are wound together on an tube. So an texturizing machine having 312 spindles would get an output of about 748 kgs per day at 100% efficiency as wound denier would be 40 and 156 bobbins would be wound at a time, and filament yarn machine consisting of 1 winder having 10 bobbin winding capacity would give an output of about 153 kgs at 100% efficiency as 10 bobbins would be wound at a time.

Now as using the method as per present disclosure as shown in column 7A2 with reference to Figure 4, 10 Bobbins of separable interlaced filament yarn is made by in such a way that the interlacing is very strong and is retained in further process and in fabric. 2 such separable interlaced filament yarn are texturized per spindle, (i.e. 624 yarns ) on texturizing machine as shown in figure 6C and with an output of 312 packages winding at the same time of 2 ply separable textured yarns and the output is doubled about 1497 kgs as compared to the conventional process.

As shown column 7A3 by using the method as per present disclosure with reference to Figure 4A.4B and 4C, 2- ply separable interlaced filament yarn of final denier 64 having two separable interlaced filament yarn of 32 denier. On texturizing machine with reference to figure 6B by using this filament yarn on 312 spindles, 20 denier 2- ply separable textured yarn would be wound on 312 tubes at a time and 312 packages would be formed at a time and output of texturize machine would double to about 1497 kgs at 100% efficiency and the same product would be formed. It is very essential that the interlacing on texturizing machine has to be nil or very low as high interlacing would mix the plies and would not result in separable textured yarns.

In column 7A4 in accordance with the present disclosure the filament yarn spinning capacity is doubled as shown with reference to Figure 5A where the number of jets and other related parts are doubled, and the same line will give double production as 20 numbers separable interlaced filament yarn are formed and wound in 2-ply on ten bobbins to form 10 packages of 2- ply separable interlaced filament yarn having final denier of 64. So in 7A 4 using the method of the present disclosure filament yarn and texturize production is doubled.

In column 7B1 for producing 20 denier 4- ply separable textured yarns using the conventional method the filament yarn is made using conventional method as in column 7A1. 4 filament yarns are wound together after texturizing in a package resulting in 78 packages formed at a time with winding denier being 80 ( 20 x4 ).

The output remains the same as 7A 1. Now using the method as shown in present disclosure with reference to filament yarn produced in column 7A3, yarn from 2 packages of 2- ply separable interlaced filament yarn having total denier of 64 per yarn package is fed to an spindle of texturizing machine with reference to Figure 6C, total fed denier being 128 per texturizing spindle results in 4- ply separable textured yarns being produced at all 312 spindles at a time and the texturizing production is quadruple compared to conventional way of 7B1.

In column 7B3 with regards to filament yarn, the process as in column 7A4 is carried out except that 20 numbers separable interlaced filament yarn each having deni er of 32 are wound i n a groups of 4 on the wi nder usi ng 5 bobbi ns to create 4- Ply separable interlaced filament yarn having wound denier 128. And in Column 7B4 with reference to figure 5C using 40 J ets 40 numbers of separable interlaced filament yarn each having denier of 32 are wound on 10 bobbins to get 4-ply separable interlaced filament yarn in accordance with the present disclosure and output is quadrupled for filament yarn. The filament yarn produced as per column 7B3 and 7B4 is loaded on the texturizing machine as shown with reference to figure 6C for one per spindle and at the output is 4- ply separable DTY having total denier .Thus the texturizing production is quadrupled compared to the conventional method as shown in column 7B1.

As shown in column 7C1 for producing 10 denier 4- ply separable interlaced filament yarn, 16 denier of separable interlaced filament yarn would be required.

To produce 16 denier yarn, the line output would be about 78 kgs and it is assumed that the line has a minimum capacity of 150 kgs per day. So it would not be possible to produce the filament yarn for 10 denier unless changes are made to reduce its capacity by changing the melt line size, reducing melt pump capacity, reducing residence time, etc. Now by using the method in accordance with the present disclosure for preparing 4-ply separable interlaced filament yarn, the number of interlacing jets is increased to 2 times or 4 times as shown in Column 7C2 with respect to Figure 5B and Column 7C3 with respect to figure 5C respectively and an output for 16 denier 4-ply separable interlaced filament yarn having total denier of 64 denier with each separable interlaced filament having denier of 16. This filament yarn when used on texturizing machine in accordance with the present disclosure as shown in column 7C2 and 7C3 would give an output of 4 times compared to the output possible using conventional method as shown in column 7C1.

Likewise more the number of plies more the output would be possible for a particular denier of yarn. The examples shown are in illustration and figures are with respect to 2- ply and 4-ply. Using the method as per present disclosure it is possible to make any number of plies including 3-ply, 5- ply, 10- ply, 40-ply, 100- ply, etc. and the production would be increasing manifold in texturizing and at filament yarn stage.

Accordingly, the disclosure in an aspect provides a multi-ply separable interlaced yarn comprising a plurality of filament yarns, wherein at least one filament yarn comprises a plurality of filaments separably interlaced to each other and has a denier in a range from 3 to 9. Hence the present disclosure also provides a woven textile fabric having a plurality of warp and weft yarns, the fabric comprising a plurality of multi-ply separable interlaced yarns as weft yarns, said yarns having a denier in a range from 3-9 providing the woven fabric having a thread count more 2000 threads per square i nch. T he yarn may be textured yarn.

The present disclosure in another aspect provides a multi-ply separable interlaced yarn comprising a plurality of filament yarns, wherein at least one filament yarn comprises a plurality of filaments separably interlaced to each other and has a denier ranging from 3 to 32, wherein the multi-ply separable yarn is made of bio- polymer including poly-lactic acid. Accordingly, the present disclosure also provides a woven textile fabric having a plurality of warp and weft yarns, said fabric comprising a plurality of multi-ply separable interlaced filament yarns made of bio-polymer including poly-lactic acid as the weft yarns, wherein the yarns have a denier in a range from 3 to 32 for providing the fabric having thread count more 400 threads per square inch. The yarn may be textured yarn.

The preferred embodiment does not limit the scope and ambit of the disclosure. The description provided is purely by way of example and illustration.

T E C H NICAL ADVA NC E M E NTS AND E C ONOMIC SIG NIFICA NC E

The technical advancements offered by the method of manufacturing yarns disclosed in the present disclosure are as follows:

I Very high output of multi-ply separable filament yarn including bio- polymer as well as woven textile fabric having very high thread count. I Very high output of multi-ply separable textured yarns as well as woven textile fabric having very high thread count of textured yarns.

I Very high efficiency as compared to conventional system/method in textured and fi lament yarn.

I Much stable process.

I Increased capability to produce super-fine/low and ultra-fine/low denier multi-ply separable textured yarns.

I R educti on i n wastage and i ncreased speeds of processi ng yarns

Very low costs of producing multi-ply separable interlaced filament yarn and multi-ply separable textured yarn including bio-polymer yarns making environment friendly also.

I V ery I ow capital cost i nvolved i n i ncreasi ng output.

I Better quality yarns. I More plies in multi-ply separable textured yarns.

I Increasing plies in multi-ply separable textured yarn results in decreasing cost instead of increasing cost.

i H ighest possi bl e quality of yarns with mi ni mal cost i nvolvement.

Throughout this specification the word ' comprise., or variations such as " comprises , or " comprising., will be understood to imply the inclusion of a stated element, integer or step, or group of elements, integers or steps, but not the exclusion of any other element, integer or step, or group of elements, integers or steps.

The use of the expression " at least, or " at least one. suggests the use of one or more elements or ingredients or quantities, as the use may be i the embodiment of the disclosure to achieve one or more of the desired objects or results.

Any discussion of documents, acts, materials, devices, articles or the like that has been included in this specification is solely for the purpose of providing a context for the disclosure. It is not to be taken as an admission that any or all of these matters form a part of the pri or art base or were common general knowl edge i n the field relevant to the disclosure as it existed anywhere before the priority date of this application.

The numerical values mentioned for the various physical parameters, dimensions or quantities are only approximations and it is envisaged that the values higher/lower than the numerical values assigned to the parameters, dimensions or quantities fall within the scope of the disclosure, unless there is a statement in the specification specific to the contrary.

The embodiments herein and the various features and advantageous details thereof are explained with reference to the non-limiting embodiments in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.

While considerable emphasis has been placed herein on the components and component parts of the preferred embodiments, it will be appreciated that many embodiments can be made and that many changes can be made in the preferred embodiments without departing from the principles of the disclosure.

The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modifilament yarn and or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.