APPARATUS AND PROCESS OF PREPARATION THEREOF

FIELD

The present disclosure relates to a multifilament yarn having varying denier along its length, apparatus and process of preparation thereof.

DEFINITION As used in the present disclosure, the following term is generally intended to have the meaning as set forth below, except to the extent that the context in which they are used indicate otherwise.

Texturized filament refers to a filament having lengthwise variation in denier.

Draw ratio refers to the ratio of speed of rotation of a feed roller to the speed of rotation of a take-up roller.

BACKGROUND

The aesthetics of a fabric can be greatly improved by introducing various texturizing effects such as varying shades or color. The variation in shades/color is achieved conventionally by use of two or more feeder units bearing two or more differently shaded/colored filaments. Hence, the conventional techniques of preparing yarn with dye shade variation require multiply apparatus with complicated setup. There is no such yarn or filament and/or single bath dyeing process that can impart such variation in dye shade along its length.

There is, therefore, felt a need for a simple and direct method for preparing yarn with dye shade variation along its length. OBJECTS

Some of the objects of the present disclosure, which at least one embodiment herein satisfies, are as follows. An object of the present disclosure is to ameliorate one or more problems of the prior art or to at least provide a useful alternative.

An object of the present disclosure is to provide variation in denier along the length of yarn without using a multi-ply apparatus typically for differential dyeing in single bath. Another object of the present disclosure is to provide a process of preparing the yarn wherein the variation in denier can be controlled.

Still another object of the present disclosure is to provide variation in denier along the length of a doped dyed yarn.

Yet another object of the present disclosure is to improve the aesthetics of the yarn by producing texturized pattern using a simple set-up.

Other objects and advantages of the present disclosure will be more apparent from the following description, which is not intended to limit the scope of the present disclosure.

SUMMARY

In one aspect, the present disclosure provides a texturized multifilament yarn comprising a plurality of texturized filaments wherein each filament varies in denier along its length.

In one embodiment, the lengthwise variation in denier is periodic and regular. In another embodiment, the lengthwise variation in denier is random.

In an embodiment, the yarn is a dyed yarn characterized by lengthwise variation in dye shade.

In another aspect, the present disclosure provides a texturized textile comprising texturized multifilament yarn, wherein the texturized textile is characterized by variation in texture in one dimension.

Typically, the texturized textile is characterized by variation in dye shade in one dimension.

Typically, the textile is characterized by variation in dye color and dye shade in one dimension.

Typically, the textile further comprises non-texturized yarn. In yet another aspect, the present disclosure provides a process for preparing the texturized multifilament yarn. The process comprises the following steps:

(i) feeding filaments into a processing unit using a feed roller;

(ii) processing and drawing the filaments simultaneously to obtain texturized filaments characterized by lengthwise variation in denier, wherein the processing step comprises subjecting the filaments to heating in a heating module, cooling in a cooling module and twisting-untwisting in a twisting- untwisting unit, wherein the step of drawing said filaments is carried out at a pre-determined draw ratio between the feed roller and a take up roller; wherein variation in draw ratio is done in a pre-determined manner;

(iii) obtaining a plurality of texturized filaments comprising variation in denier along its length; and

(iv) combining the plurality of texturized filaments to obtain a texturized multifilament yarn.

Typically, the step of combining further comprises combining the plurality of texturized filaments with non-texturized filaments.

Typically, the filaments are dye-doped.

The process further comprises a step of dyeing the texturized multifilament yarn to obtain a multifilament yarn varying in shade along its length, wherein the yarn has differential uptake of dye along its length.

Typically, the variation in the draw ratio is in the range of 0.01 to 2.5.

Typically, the variation in the draw ratio is carried out over a time interval in the range of 1 to 50 seconds.

In one embodiment, the variation in the draw ratio with time is regular. In another embodiment, the variation in the draw ratio with time is random.

Typically, the variation in draw ratio with time is carried out by changing electrical parameters of either the feed roller or the take up roller or combination thereof. In an embodiment, the filaments are selected from the group consisting of partially oriented yarn (POY), low oriented yarn (LOY), medium oriented yarn (MOY) and Fully Drawn yarn (FDY).

Typically, each of the filaments has a cross section selected from the group consisting of circular, non-circular and combinations thereof.

Typically, the filaments are in the form of a melt spun yarn selected from the group consisting of lustre yarn and non-lustre yarn.

Typically, the filaments are at least one selected from the group consisting of polyester blend and functionalized polyester.

In yet another aspect, the present disclosure provides an apparatus for preparing texturized multifilament yarn. The apparatus comprises:

• a processing unit for processing filaments;

• a feed roller for feeding the filaments to the processing unit;

• a take-up roller for receiving filaments from the processing unit;

• a first driving means coupled to the feed roller for rotating the feed roller;

• a second driving means coupled to the take-up roller for rotating the take-up roller; and

• a controlling means coupled to at least one of the feed roller and the take-up roller for controlling variation of draw ratio between the feed roller and the take-up roller,

wherein the processing unit comprises a heating module and a cooling module for sequential heating and cooling pre-determined length sections of the filaments traversing through the processing unit.

The processing unit further comprises a twisting-untwisting unit for twisting and untwisting pre-determined length sections of the filaments traversing through the processing unit.

The apparatus further comprises a nip generation unit and a heat-setting unit.

In an embodiment, the take-up roller receives non-texturized filaments.

Typically, the controlling means is programmable logic controller (PLC) or a manual controller. BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING

The single ply multifilament yarn of the present disclosure will now be described with the help of the accompanying drawing, in which:

Figure 1 illustrates an apparatus (100) for preparing multifilament yarn varying in denier along its length, in accordance with the present disclosure.

Figure 2 illustrates a variation in draw ratio profile with time in accordance with the present disclosure.

Figure 3 illustrates a variation in draw ratio profile with time in accordance with the present disclosure. Figure 4 shows dyed samples obtained at a machine speed of 300 m/min in accordance with the present disclosure.

Figure 5 shows dyed samples obtained at a machine speed of 400 m/min in accordance with the present disclosure.

Figure 6 shows dyed samples obtained at a machine speed of 500 m/min in accordance with the present disclosure.

Figure 7 shows dyed samples obtained at a machine speed of 600 m/min in accordance with the present disclosure.

Figure 8 shows cationic dyeable polyester dyed samples obtained in accordance with the present disclosure. Figure 9 shows dyed samples obtained by dyeing a yarn comprising two different types of yarns combined before texturizing, in accordance with the present disclosure.

Figure 10 shows dyed samples obtained by dyeing a yarn comprising a texturized yarn and a non-texturized yarn, in accordance with the present disclosure.

DETAILED DESCRIPTION It is desirable to produce texture in a yarn for improving the aesthetics of a fabric. However, the conventional production of textures such as variation in dye shade of the yarn requires complicated apparatus having multiple feeding units carrying filaments of varying dye shades.

The lengthwise variation in shade of a filament can lead to the desired texture in the fabric. The variation in thickness of a filament along its length leads to different dye pick-up ability and thereby variation in the shade along its length. There is no single bath dyeing process that can impart such variation in dye shade along its length.

The present disclosure provides a texturized multifilament yarn varying in denier along its length, and an apparatus and a process of preparation thereof. The present disclosure uses a simple and direct process to achieve the lengthwise variation in denier of the yarn. In one aspect, the present disclosure provides a texturized multifilament yarn comprising a plurality of texturized filaments wherein each filament varies in denier along its length.

In accordance with one embodiment, the variation in denier along the length of the yarn is periodic and regular.

In accordance with another embodiment, the variation in denier along the length of the yarn is random.

In an embodiment, the yarn is a dyed yarn characterized by lengthwise variation in dye shade.

In accordance with one embodiment, the present disclosure relates to a texturized multifilament yarn having varying denier along its length typically for differential dyeing in single bath. In accordance with another embodiment, the yarn is doped dyed.

In one embodiment, the yarn has different shades of the same color. In another embodiment, the yarn has different shades of varying color.

In another aspect, the present disclosure provides a texturized textile comprising texturized multifilament yarn, wherein the texturized textile is characterized by variation in texture in one dimension.

Typically, the textile is characterized by variation in dye shade in one dimension. Typically, the textile is characterized by variation in dye color and dye shade in one dimension.

In an embodiment, the textile further comprises non-texturized yarn.

In yet another aspect, the present disclosure provides a process for preparing the texturized multifilament yarn, by using the apparatus as depicted in Figure 1. The process comprises a step of feeding filaments (101) into a processing unit (103) using a feed roller (102). The filaments (101) are subjected to processing and drawing simultaneously to obtain texturized filaments characterized by lengthwise variation in denier.

In one embodiment, one set of filaments (101) are fed to the feed roller (102). In another embodiment, two sets of filaments (101 and 111) are fed to the feed roller (102) (filaments 111 shown as dotted lines in Figure 1). The two sets of filaments (101 and 111) are of same type or different type.

The processing step comprises subjecting the filaments (101) to heating in a heating module (103a), cooling in a cooling module (103b) and twisting-untwisting in a twisting-untwisting unit (103c).

The step of drawing the filaments (101) is carried out at a pre-determined draw ratio between the feed roller (102) and a take up roller (104).

In accordance with the process of the present disclosure, a plurality of texturized filaments varying in denier along its length is obtained. The plurality of texturized filaments is combined to obtain a texturized multifilament yarn (107).

Further, the texturized multifilament yarn (107) passes through a nip generation unit (105), and a heat setting unit (106). The resultant yarn (107) varies in denier along its length in accordance with the variation in the draw ratio with time.

In an embodiment, the step of combining further comprises combining plurality of texturized filaments with non-texturized filaments (108). The non-texturized filaments (108) are fed to the take up roller (104), wherein the texturized filaments prepared in accordance with the present disclosure are combined with the non-texturized filaments (108) using the heat setting unit (106). In an embodiment, the texturized filaments and the non-texturized filaments (108) are of same type or different type.

Typically, the lengthwise variation in denier depends on the denier of the filaments (101) and the draw ratio. The variation in the draw ratio with time leads to differential drawing of the filaments (101) thereby causing lengthwise variation in denier. Figures 2 and 3 depict the change in the draw ratio profile with time wherein the draw ratio (DR) is varied for a particular time interval (Tn) such that Tn>0.5 sec. The time interval (Tn) is changed so as to obtain variable draw ratios and thereby the desired variation in denier along the length of the yarn. In one embodiment, the filaments (101) are dye-doped.

In another embodiment, the process further comprises a step of dyeing the texturized multifilament yarn to obtain a multifilament yarn varying in shade along its length, wherein the yarn has differential uptake of dye along its length.

In accordance with the present disclosure, the variation in the draw ratio is in the range of 0.01 to 2.5. Typically, the variation in the draw ratio is carried out for a time interval in the range of 1 to 50 seconds. The length of the dye shade variation is controlled by repeating time interval cycle for a desired length.

In one embodiment, the variation in the draw ratio with time is regular. The time interval (Tn) is varied in a periodic manner such that the resulting variation in denier is also periodic in nature. In an embodiment, the time interval cycle is repeated in the order as 1 second, 2 seconds, 3 seconds, 4 seconds and so on.

In another embodiment, the variation in the draw ratio with time is random. The time interval (Tn) is varied in a random manner such that the resulting variation in denier is also random in nature. In one embodiment, the time interval cycle is repeated in the order as 1 second, 3 seconds, 5 seconds, 2 seconds and so on. In another embodiment, the time interval cycle is repeated in the order of any combination of time interval.

The variation in the draw ratio with time is carried out by changing electrical parameters of either the feed roller (102) or the take up roller (104) or combination thereof. In one embodiment, the electrical parameter is voltage. In accordance with an embodiment of the present disclosure, the filaments (101) are taken in the form of a yarn. Typically, the yarn is thermoplastic in nature. Typically, the yarn is selected from the group consisting of Partially oriented yarn (POY), Low oriented yarn (LOY), Medium oriented yarn (MOY) and Fully Drawn yarn (FDY). In accordance with an embodiment of the present disclosure, the non-texturized filaments (108) are taken in the form of a yarn. Typically, the yarn is thermoplastic in nature. Typically, the yarn is selected from the group consisting of Low oriented yarn (LOY), Medium oriented yarn (MOY) and Fully Drawn yarn (FDY). Typically, each of the filaments (101) has a cross section selected from the group consisting of circular, non-circular and combinations thereof. Typically, the filaments (101) are taken in the form of a melt spun yarn selected from the group consisting of lustre yarn and non-lustre yarn.

Typically, the filaments (101) are at least one selected from the group consisting of polyester blend and functionalized polyester.

In one embodiment, the yarn is dyed after texturizing step, wherein the yarn picks up varying amount of dye to give differentially dyed yarn.

In one embodiment, the texturized multi-filament yarn is space dyed for obtaining differentially dyed multi-colored yarn. In another embodiment, the texturized yarn is dyed by multi-color package dyeing for obtaining multi-colored yarn having variation in dye color and dye shade in one direction. In accordance with the present disclosure, the length of the dye shade varies with machine production speed. In an embodiment, machine production speed varies from 100 m/min to 1100 m/min.

In yet another aspect, the present disclosure provides an apparatus (100), as depicted in Figure 1, for preparing the texturized multifilament yarn. The apparatus (100) comprises a processing unit (103) for processing filaments (101), a feed roller (102) for feeding the filaments (101) to the processing unit (103) and a take-up roller (104) for receiving filaments from the processing unit (103).

The feed roller (102) is rotated by a first driving means coupled to the feed roller (102). The take-up roller (104) is rotated by a second driving means coupled to the take-up roller (104). The apparatus (100) further comprises a controlling means coupled to at least one of the feed roller (102) and the take-up roller (104) for controlling variation in the draw ratio between the feed roller (102) and the take-up roller (104).

The processing unit (103) comprises a heating module (103a) and a cooling module (103b) for sequential heating and cooling pre-determined length sections of the filaments (101) traversing through the processing unit (103).

The processing unit (103) further comprises a twisting-untwisting unit (103c) for twisting and untwisting pre-determined length sections of the filaments (101) traversing through the processing unit (103). The apparatus (100) further comprises a nip generation unit (105) and a heat-setting unit (106).

In an embodiment, the take-up roller (104) receives non-texturized filaments (108).

Typically, the controlling means is programmable logic controller (PLC) or a manual controller. In an embodiment, the PLC controller is used for rapidly varying the time interval while changing the draw ratio.

In an embodiment, texturing units in the apparatus (100) for producing includes, but is not limited to, Disc type, Nip-disc, Nip-nip and Air-jet.

The present disclosure is further described in light of the following experiments which are set forth for illustration purpose only and not to be construed for limiting the scope of the disclosure. The following experiments can be scaled up to industrial/commercial scale and the results obtained can be extrapolated to industrial scale.

Examples 1-6:

A semi dull PET partially oriented yarn with 250/48 d was textured by false twist method in a machine. The draw ratio of machine was changed from 1.3 to 1.5 within different time intervals as given in Table 1 (3 seconds for Example 1) at constant machine speed of 300 m/min. The processing parameters were kept constant for examples 1-6, wherein the D/Y ratio (ratio of disk surface speed to the yarn speed) was 1.55, primary heater temperature was 180 °C, secondary heater temperature 160 °C, and disc configuration was 1-4-k. The resultant yarn was textured having average denier 190+1, Elongation 50+2% Tenacity 3.2+1 (gpd), Crimp contraction (CC%) 19+1, Hot Shrinkage (SH%) 1.2+1 and oil pick-up% with respect to yarn (OPU) as 3.5 (Table -1).

The developed yarn was used to prepare the knitted hose in 48 gauge machine. The hose was dyed with Dianix Blue with 1% shade at 130 °C for 30 min followed by cooling to 80 °C, hot washing and finally drying at room temperature. The dyed samples for examples 1-6 are shown in Figure 4.

Table 1 provides the parameters for obtaining the yarn having variation in denier with machine speed of 300 m/min and the characteristic values of the resultant yarn.

Elongation

52.9 48.3 53.1 52.6 49.9 50.7

%

Tenacity

3.3 3 3.2 3.2 3.3 3.2

(gpd)

Crimp

contraction

(CC %) 19.2 18.2 18.1 18.9 20.4 19.8

Hot

Shrinkage 1.3 1.3 1.2 1.3 1.1 1.1

(SH %)

Oil pick-up

with respect

3.5 3.6 3.6 3.5 3.5 3.5

to yarn (OPU

%)

Length of

Light shade 6.45 8.85 11.15 13.45 26.15 28.55

(m)

Length of

Dark shade 7.55 11.15 14.05 17.55 22.15 23.25

(m)

The dyed samples so obtained have a lengthwise variation in denier and lengthwise variation in shade.

Examples 7-12:

A semi dull PET partially oriented yarn with 250/48 d was textured by false twist method in a machine. All the parameters were same as in examples 1-6 except that the constant machine speed was 400 m/min (Please refer Table 2). The resultant yarn was textured having the average denier 190+1, Elongation 54+2% Tenacity 3.2+0.1 (gpd), Crimp contraction (CC%) 16+0.5, Hot Shrinkage (SH%) 1.7+0.1 and oil pick-up% with respect to yarn (OPU) as 3.0.

The developed yarn was used to prepare the knitted hose in 48 gauge machine which was subsequently dyed as per example 1. The dyed samples for examples 7-12 are shown in Figure 5.

Table 2 provides the parameters for obtaining the yarn having variation in denier with machine speed of 400 m/min and the characteristic values of the resultant yarn.

Elongation

57.2 54.3 56.2 53.4 55.3 56.9

%

Tenacity

3.1 3.1 3.2 3.2 3.2 3.20 (gpd )

Crimp

contraction 16.5 17.6 17.4 16.2 17 15.2

(CC %)

Hot

Shrinkage 1.6 1.8 1.7 1.7 1.6 1.6

(SH %)

Oil pick-up

with respect

2.8 2.9 2.8 3.3 2.9 2.9 to yarn (OPU

%)

Length of

Light shade 7.25 9.75 12.35 14.35 26.95 27.25

(m)

Length of

Dark shade 9.15 11.75 14.85 18.25 21.65 25.35

(m)

The dyed samples so obtained have a lengthwise variation in denier and lengthwise variation in shade.

Examples 13-18: A semi dull PET partially oriented yarn with 250/48 d was textured by false twist method in a machine. All the parameters were same as in examples 1-6 except that the constant machine speed was 500 m/min (Please refer Table 3). The resultant yarn was textured having the average denier 188+1, Elongation 47+10% Tenacity 3.1+0.1 (gpd), Crimp contraction (CC%) 14+2, Hot Shrinkage (SH%) 1.8+0.1 and oil pick-up% with respect to yarn (OPU) as 2.3 (Table-3).

The developed yarn was used to prepare the knitted hose in 48 gauge machine which was subsequently dyed as per example 1. The dyed samples for examples 13-18 are shown in Figure 6. Table 3 provides the parameters for obtaining the yarn having variation in denier with machine speed of 500 m/min and the characteristic values of the resultant yarn.

Av. Denier 190.6 187.7 188.3 188.2 188.4 188.1

Elongation 38.7 61.3 47.7 57 55.8 54.8

%

Tenacity 3 3.2 2.7 3.2 3.2 3.2

(gpd)

Crimp

contraction 15 15 11 14.7 12.9

(CC %) 13.2

Hot

Shrinkage 2.3 1.8 1.9 2 2.1 2

(SH %)

Oil pick-up %

with respect

2.4 2.4 2.3 2.4 2.2 2.1 to yarn (OPU

%)

Length of

Light shade 7.45 10.85 13.15 14.45 27.25 29.95

(m)

Length of

9.65 12.15 15.25 18.95 22.65 23.85

Dark shade

(m)

The dyed samples so obtained have a lengthwise variation in denier and lengthwise variation in shade.

Examples 19-24: A semi dull PET partially oriented yarn with 250/48 d was textured by false twist method in a machine. All the parameters were same as in examples 1-6 except that the constant machine speed was 600 m/min (Please refer Table 4). The resultant yarn was textured having the average denier 187+1, Elongation 57+5% Tenacity 3.0+0.1 (gpd), Crimp contraction (CC%) 14+5, Hot Shrinkage (SH%) 1.8+0.4 and oil pick-up% with respect to yarn (OPU) as 1.7.

The developed yarn was used to prepare the knitted hose in 48 gauge machine which was subsequently dyed as per example 1. The dyed samples for examples 19-24 are shown in Figure 7.

Table 4 provides the parameters for obtaining the yarn having variation in denier with machine speed of 600 m/min and the characteristic values of the resultant yarn.

Secondary

160 160 160 160 160 160 Heater

Av. Denier 187.9 186.8 187.7 189 187.9 187

Elongation

50.3 62.4 60.8 53.6 50.8 62.9

%

Tenacity

2.8 3 3.1 3.1 2.8 2.9 (gpd )

Crimp

contraction 16.2 15 10 18 14.7 10.9 (CC %)

Hot

Shrinkage 1.3 1.8 1.4 2 2.2 2 (SH %)

Oil pick-up

with respect

1.8 1.8 1.7 1.7 1.8 1.7 to yarn (OPU

%)

Length of

7.95 9.45 12.15 15.45 21.25 23.65 Light shade

(m)

Length of

10.75 14.15 15.95 19.95 27.35 30.25 Dark shade

(m) The dyed samples so obtained have a lengthwise variation in denier and lengthwise variation in shade.

Examples 25-28:

A cationic dyeable PET partially oriented yarn with 126/72 d was textured by false twist method in a machine. The draw ratio of machine was changed from 1.3 to 1.5 within different time intervals as given in Table 5 (3 seconds for Example 25) at constant machine speed of 300 m/min. The processing parameters were kept constant for all the examples (25-28) as given in Table 5. The resultant denier was textured having average denier 98+1, Elongation 51+3% Tenacity 2.3+0.1 (gpd), Crimp contraction (CC%) 7.4+0.55, Hot Shrinkage (SH%) 0.6+0.2 and oil pick-up% with respect to yarn (OPU) were 5.1 (Table -5).

The developed yarn was used to prepare the knitted hose in 48 gauge machine. The hose was dyed with Coracryl Red CF38 with 1% shade at 100 °C for 45 min followed by cooling at 70 °C, hot washing and finally drying at room temperature. The dyed samples for examples 25- 28 are shown in Figure 8. Table 5 provides the parameters for obtaining the yarn having variation in denier with machine speed of 300 m/min (for cationic dyeable PET partially oriented yarn) and the characteristic values of the resultant yarn.

Primary Heater 170 170 170 170

Secondary Heater 175 175 175 175

Av. Denier 98.8 98.2 98.6 98.7

Elongation % 49 47.9 52.8 53

Tenacity (gpd ) 2.3 2.3 2.3 2.2

Crimp contraction

7 7.8 7.1 7.8 (CC %)

Hot Shrinkage

0.7 0.8 0.5 0.7

(SH %)

Oil pick-up with

respect to yarn 5.2 4.7 4.9 5.1

(OPU %)

The dyed samples so obtained have a lengthwise variation in denier and lengthwise variation in shade.

Example-29:

A semi dull PET partially oriented yarn with 126/90 d with multi cross section (Circular, Plus, Trilobal) was textured by false twist method in a machine. All the parameters were same as in examples 1-6 except that the constant machine speed was 500 m/min and draw ratio of machine was changed from 1.4 to 1.8 within time interval of 6 seconds, as provided in Table 6.The resultant yarn was textured having the average denier 90+3, Elongation 42+10% Tenacity 3.3+0.2 (gpd), CC% 7+2, SH% 0.9+0.2 and OPU as 3.3+0.2. The developed yarn was used to prepare the knitted hose in 48 gauge machine which was subsequently dyed as per example 1.

Table 6 provides the parameters for obtaining the yarn having variation in denier with machine speed of 500 m/min and the characteristic values of the resultant yarn.

shade (m)

Length of Dark shade

18.35

(m)

Example-30:

Slub yarn produced, using semi dull PET partially oriented yarn with 122/72 d semi dull was textured by false twist method in a machine, and 150/48 d Bright FDY (fully drawn yarn) was introduced after the twisting-untwisting unit and before take up roller and combine with twist-untwist yarn, and further heat setting was done to combine yarn. The machine speed was 500 m min and draw ratio of machine was changed from 1.4 to 1.8 within time intervals of 3 seconds, as provided in Table 7The resultant yarn was textured having the average denier 280+3, Elongation 55+10% Tenacity 2.0+0.2 (gpd), CC% 4+2, SH% 11+2 and OPU as 3.0+0.2.

The developed yarn was used to prepare the knitted hose in 48 gauge machine which was subsequently dyed as per example 1. The dyed samples for example 30 are shown in Figure 9.

Table 7 provides the process parameters for obtaining the dyed sample by dyeing a yarn comprising a texturized and a non-texturized yarn.

Av. Denier 280.7

Elongation % 60.01

Tenacity (gpd) 1.95

Crimp contraction

2.1

(CC %)

Hot Shrinkage (SH

11.5

%)

Oil pick-up with

respect to yarn (OPU 3.0

%)

Length of Light

7.75

shade (m)

Length of Dark shade

10.15

(m)

The dyed samples so obtained have a lengthwise variation in denier and lengthwise variation in shade.

Example-31:

Linen yarn produced from 330/96 d - Bright FDY (fully drawn yarn) was textured by false twist method in a machine, after twist untwist yarn was further heat set. The machine speed was 500 m/min and draw ratio of machine was changed from 1.05 to 1.12 within time intervals of 3 seconds, as provided in Table 8. The resultant yarn was textured having the average denier 310 ±5, Elongation 25+10% Tenacity 2.0+0.2 (gpd), CC% 4+2, SH% 11+4 and OPU as 3.0+0.2.

The developed yarn was used to prepare the knitted hose in 48 gauge machine which was subsequently dyed as per example 1. The dyed samples for examples 31 are shown in Figure 10. Table 8 provides the process parameters for obtaining dyed samples obtained by combining two yarns before texturizing.

The dyed samples so obtained have a lengthwise variation in denier and lengthwise variation in shade.

TECHNICAL ADVANCEMENTS

The texturized multifilament yarn of the present disclosure described herein above has several technical advantages, including but not limited to, the realization of:

- the yarn has varying denier along its length;

- the process used to achieve the variation in denier is simple and straightforward along with the scope of controlling the nature of variation in denier; and

- improved aesthetic characteristics of yarn by forming multi-colored pattern.

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 in the embodiment of the disclosure to achieve one or more of the desired objects or results.

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.

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. These and other changes in the preferred embodiment as well as other embodiments of the disclosure will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the disclosure and not as a limitation