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Title:
METHOD OF MAKING WATER RESISTANT FLEXIBLE PACKAGE FROM A WEB OF POLYMERIC WOVEN FABRIC AND A WATER RESISTANT PACKAGE THEREOF
Document Type and Number:
WIPO Patent Application WO/2017/051431
Kind Code:
A1
Abstract:
A method for making a water resistant package (322) with a valve (330) is provided. The method includes forming a continuous tube (318) with nano perforations (310, 312) on first and second predefined portions (310, 312) along the first and the second sides (302, 304) of the web (201) respectively. The method includes attaching a strip of absorbent substrate (202) over at least one of the first and the second nano-perforated predefined portions (310, 312). The method further includes folding the web (201) such that the nano perforated predefined portions are overlapped forming a pocket having the strip of absorbent substrate within and sealing the longitudinal edges of the web (201) to form the continuous tube (318). The woven flexible package formed used to prevent water ingress and at the same time allows air to exit from the package while filling the product.

Inventors:
CHATURVEDI ASHOK (IN)
Application Number:
PCT/IN2016/050295
Publication Date:
March 30, 2017
Filing Date:
September 05, 2016
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
CHATURVEDI ASHOK (IN)
International Classes:
B65D30/24; B65D33/01; B65D81/26
Foreign References:
US5493844A1996-02-27
IN1417DE2014A2015-06-26
Other References:
None
Attorney, Agent or Firm:
SINGH, Raghavendra Pratap (IN)
Download PDF:
Claims:
I Claim:

1 . A method of manufacturing water resistant flexible package from a web (201 ) of polymeric woven fabric, the method comprising the steps of:

providing a web (201 ) of laminated woven fabric having a first edge (302) and a second edge (304);

providing nano-perforations (308a, 308b) on first and second predefined portions (310, 312) along the first and the second edges (302, 304) of the web (201 ) respectively;

attaching a strip of absorbent substrate (202) over at least one of the first and the second nano-perforated predefined portions (310, 312);

folding the web (201 ) such that the nano perforated predefined portions (310, 312) overlap each other forming a pocket thereby and the strip of absorbent substrate remains inside the pocket;

sealing the longitudinal edges (302, 304) of the web (201 ) to form the continuous tube (318);

cutting-off the continuous tube (318) into tube pieces (320) such that each tube piece (320) has at least a first open end (324) and a second open end (326); forming a first pair of flaps (F1 , F2) and a second pair of flaps (F3, F4) on the first open end (324) and the second open end (326) respectively;

sealing a cut laminate piece (326) to the second pair of flaps (F3, F4) on the second open end (326) and folding said cut laminate piece (328) to form a valve (330);

folding and flattening both the pairs of flaps (F1 , F2, and F3, F4) at both the open ends (324, 326) of the tube piece (320) so that the edges of the flaps (F1 , F2, and F3, F4) meet at the centre; and

sealing a pre-cut cover patch (332) onto the folded and flattened pairs of flaps (F1 , F2, and F3, F4) at both the ends of the tube piece (320) to close the open- ends (324, 326) of the package.

2. The method as claimed in claim 1 , wherein the web (201 ) is a printed or an unprinted laminated woven fabric such as Woven Polypropylene (WPP) or Woven High Density Polyethylene (WPE).

3. The method as claimed in claim 1 , wherein woven laminate is at least extrusion coated, printed, or coated with radiation curable coating over printing and radiation cured or a combination thereof.

4. The method as claimed in claim 1 , wherein the nano perforated predefined portions (310, 312) are provided at a predetermined distance (D) from the longitudinal edges (302,304) of the web (201 ), leaving sealing spaces (314, 316).

5. The method as claimed in claim 1 , wherein the predefined portions (310, 312) have a width within a range of about 200mm to 250mm with a hole density of 50 to 250 holes per square inch.

6. The method as claimed in claim 1 , wherein the nano-perforations (308a, 308b) are of size less than 50 microns.

7. The method as claimed in claim 1 , wherein the nano-perforations (308a, 308b) are made by using at least one of needles and laser perforation techniques.

8. The method as claimed in claim 1 , wherein the strip of absorbent substrate (202) is larger than the width of the nano perforated predefined portions (310, 312), such that the strip of absorbent substrate (202) must cover all the nano- perforations (308a, 308b) on the web (201 ).

9. The method as claimed in claim 1 , wherein the strip of the absorbent substrate (202) is attached over the nano-perforated predefined portion (310) by sealing using hot melt adhesive, hot air sealing, ultrasonic sealing, laser sealing or any other suitable sealing method.

10. The method as claimed in claim 1 , wherein the step of providing the valve (330) further includes: sealing a cut laminate piece (328) to the second pair of flaps (F3, F4) of the second open end, wherein the cut laminate piece (328) is protruding out of the edges of the tube by a predefined offset distance (Do) and a predefined mouth distance (Dm) from the side of the flap on the second open end (326); and folding the cut laminate piece (328) to form the valve (330).

1 1 . The method as claimed in claim 10, wherein the length of cut laminate piece (326) is provided such that the mouth distance is null and the valve (330) does not protrude outside the edge of the tube.

12. The method as claimed in claim 1 , wherein the cut laminate piece (328) is made up of at least one of Woven Polypropylene (WPP) or High Density Woven Polyethylene (WPE) fabric with or without extrusion coating of Polypropylene or Polyethylene or a combination of both, on one or both the sides.

13. The method as claimed in claim 1 , wherein the step of providing the valve (330) on the second pair of flaps (F3, F4) includes sealing an offline pre-formed tube as valve to the second pair of flaps (F3, F4) on the second open end.

14. The method as claimed in claim 1 , wherein the sealing is performed using at least one of heat sealing, sealing with hot melt adhesive, hot air sealing, ultrasonic sealing, sealing using glue, sealing with hot extrusion layer or by Laser welding.

15. A water resistant flexible package (322), with valve, the package (322) comprising:

a first panel (604) and a second panel (606) joined at a longitudinal seals (608a & 608b);

a pocket formed by overlapping edges of web (201 ) having nano-perforations (310 & 312) at a predefined location and a strip of absorbent substrate (202) between the nano-perforated and overlapping web surfaces

a valve (330) having a valve open mouth (610) for filling the package (322) with the desired content.

Description:
METHOD OF MAKING WATER RESISTANT FLEXIBLE PACKAGE FROM A WEB OF POLYMERIC WOVEN FABRIC AND A WATER RESISTANT PACKAGE THEREOF

FIELD OF THE INVENTION

The invention generally relates to flexible packaging and more particularly relates to water resistant packages with valve, made of laminated woven fabric such as Woven Polypropylene (WPP), or Woven Poly Ethylene (WPE), and method of making such packages.

BACKGROUND OF THE INVENTION

Flexible packages with valve are used to store various types of products such as cement, building materials, fertilizers, food grains, pet foods etc. Flexible packages commonly used for storing such products are made of Woven Polypropylene (WPP), or Woven Poly Ethylene (WPE), un-laminated or laminated.

The most common problem associated with such un-laminated woven fabric packages is air and water ingress which may spoil the product stored therein. Additionally such woven packages have micro gaps between the woven tapes allowing leakage of the product through package surface, if the product is an easy flowing material or a powdery material such as cement or similar other building materials, etc.

To overcome such problem of air and water ingress and product leakage, the woven fabric packages with valve are laminated with a film. Generally, such products are filled into the laminated woven packages through the valve using nozzle pushing air-fluid mixture at high speed & pressure which requires the air already inside the package to exit to allow filling of the product into the package at high speed. Therefore, simply laminated packages fail to provide proper filling of the product as there is very limited space for exit of air already present inside the package.

For allowing the air inside the package to exit while filling the product, a number of micro perforations are sometimes provided on the laminated woven fabric package with valve. However, these micro perforations allow exit of air from inside of the package but also allow air and water ingress from outside to a certain extent, thereby limiting the storage conditions for such packages and reducing the shelf life of the product stored therein.

Therefore, there exists a need for an improved package which prevents air and water ingress and at the same time allows air to exit from the package while filling the product, thereby allowing smooth filling of product and increasing the shelf life of these products. Also, there is a need for an improved package which is cost efficient and easy to manufacture.

SUMMARY OF THE INVENTION

In view of the foregoing limitations inherent in the prior - art, an object of the invention is to provide a water resistant flexible package having a number of nano perforation over woven laminate to prevent air and water ingress and at the same time allows air to exit from the package while filling the product.

These together with the other aspects of the invention, along with the various features of novelty that characterize the invention, are pointed out with particularity in the description, along with the abovementioned summary, annexed hereto and form a part of the invention. For a better understanding of the invention, its operating advantages and the specified object attained by its uses, reference should be made to the accompanying drawings and descriptive matter in which there are illustrated exemplary embodiments of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The advantages and features of the invention shall be better understood with reference to the following description taken in conjunction with the accompanying drawing, wherein like elements are identified with like symbols and in which :

FIG. 1 illustrates an exemplary flowchart for a method of making a water resistant package with valve, according to an embodiment of the present invention;

FIG. 2 is a diagrammatic representation of the method of forming a continuous tube for making water resistant package with valve, according to an embodiment of the present invention;

FIG. 3 is an enlarged diagrammatic representation of steps of providing perforations and attachment of absorbent substrate on the web for making the water resistant package with valve, in accordance with an embodiment of the present invention;

FIG. 4 is a diagrammatic representation of the method of making the water resistant package with valve, according to an embodiment of the present invention;

FIGS. 4A-F are diagrammatic depictions of various steps of forming the water resistant package with valve, in accordance with an embodiment of the present invention;

FIG. 5 and FIG. 5A are cross sectional views of the structures of web, in accordance with an embodiment of the present invention; and

FIG. 6 is an isometric view of a water resistant woven package with valve, according to an embodiment of the present invention.

Like reference numerals refer to like parts throughout the description of several views of the drawings.

DESCRIPTION OF THE INVENTION

For a thorough understanding of the invention, reference is to be made to the following description in connection with the above-mentioned drawings. Although the invention is described in connection with exemplary embodiments, the invention is not intended to be limited to the specific forms set forth herein. It is understood that various omissions and substitutions of equivalents are contemplated as circumstances may suggest or render expedient, but these are intended to cover the application or implementation without departing from the spirit or scope of the invention. Further, it will nevertheless be understood that no limitation in the scope of the invention is thereby intended, such alterations and further modifications in the figures and such further applications of the principles of the invention as illustrated therein being contemplated as would normally occur to one skilled in the art to which the invention relates. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, characteristic, or function described in connection with the embodiment is included in at least one embodiment of the invention. Furthermore, the appearances of such phrase at various places herein are not necessarily all referring to the same embodiment. The terms "a" and "an" herein do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item.

FIG. 1 illustrates an exemplary flowchart and FIGS. 2 to 4F illustrate exemplary diagrammatic representations of a method (100) for making a water resistant flexible woven package with valve (hereinafter referred to as the package) in accordance with an embodiment of the present invention.

Initially, at step (102), a web (201 ) of woven fabric is provided. For example, the web (201 ) may be a printed or an unprinted woven fabric made of a woven polymeric substrate such as Woven Polypropylene (WPP) or woven High Density Polyethylene (HDPE). In an embodiment, the web (201 ) has a first longitudinal edge (302) and a second longitudinal edge (304), as shown in FIG. 3. According to an embodiment of the present invention, the web (201 ) is provided from a web roll (203) on an unwinder, through pair of Pull-Rollers (204, 206), as shown in FIG. 2 and 3.

At step (104), a number of nano-perforations (308a, 308b) are provided on predefined portions (310, 312) along the first and the second edges (302, 304) of the web (201 ) respectively. In an embodiment of the present invention, the predefined portions (310 and 312) are in the form of longitudinal band provided along the length of web (201 ) adjacent to the first and the second edges (302, 304). In various alternative embodiments, the predefined portions (310, 312) may be in any other shape such as patches in square, circular, or any other shape without deviating from the scope of the claimed subject matter.

In an embodiment of the present invention, the nano-perforations (308) are provided on the web (201 ) by a number of nano-perforators (208, 210) provided along the first and the second longitudinal edges (302, 304) of the web (201 ), as shown in FIG. 3.

Further, according to an embodiment of the present invention, the predefined portions (310, 312) are provided at a predetermined distance "D" from the longitudinal edges (302 and 304) respectively, leaving sealing spaces (314, 316) as shown in FIG. 3. In an exemplary embodiment of the present invention, the predefined portions (310, 312) have a width within a range of about 50mm to 250mm with a hole density of 50 to 150 holes per square inch and the nano-perforations are of size less than 50 microns. According to various embodiments of the present invention, the nano-perforations may be made by needles, laser scoring, or any other technique known in the art.

Furthermore, at step (106), a strip of absorbent substrate (202) is attached over the first and / or the second nano-perforated predefined portions (310, 312). According to an embodiment of the present invention, the strip of absorbent substrate (202) is attached to the first nano-perforated predefined portion (310) of the web (201 ). For example, width of the strip of absorbent substrate (202) is larger than the width of the nano perforated predefined portions (310, 312), such that the strip of absorbent substrate (202) must cover all the nano-perforations (308a, 308b) on the web (201 ). In an embodiment of the present invention, the absorbent substrate (202) is a water absorbent material which is permeable to air as well. It may be contemplated that the strip of absorbent substrate (202) may be provided from a roll (212 of continuous web) of absorbent substrate (202) from an unwinder or as pre-cut strips pieces of absorbent substrate (202) in case patches of the nano- perforated predefined portions (310 and 312) are to be covered. Furthermore, as shown in FIG. 3, the strip of absorbent substrate (202) is pulled from the roll (212) through a pair of pull rollers (214). According to an embodiment of the present invention, the strip of the absorbent substrate (202) is attached over the nano- perforated predefined portion (310) by sealing using hot melt adhesive, hot air sealing, ultrasonic sealing, laser sealing or any other sealing method known in the art. For example, a pair of adhesive dispensing means (216a, 216b) dispense sealing material, such as hot melt adhesive layer in bands at predefined locations on the web (201 ). The adhesive bands are located such that portion near the edges of the strip of absorbent substrate (202) falls over the adhesive bands for sealing with the web (201 ) over the first nano-perforated predefined portion (310). Subsequently, the web (201 ) and the strip of absorbent substrate (202) are passed through a pair of pressing rollers (218) and a pair of chilled rollers (220) for sealing the two.

At step (108), the web (201 ) is folded such that the nano-perforated predefined portions (310, 312) overlap each other forming a pocket thereby and the strip of absorbent substrate (202) comes inside the pocket between the two nano- perforated predefined portions (310, 312). In an embodiment, second edge (304) of the web (201 ) is folded towards centre of the web (201 ) to form a first fold (221 ) such that nano-perforation (312) remain on top side. A second pair of adhesive dispensing means (222a, 222b) dispense sealing material, such as hot melt adhesive, over the first fold of the web (201 ) in two bands positioned on two sides of the nano- perforations (312) longitudinally along the web (201 ) movement direction. Subsequently, the first edge (302) of the web (201 ) is folded to form a second fold (223) such that second nano-perforations (312) are overlapped by first nano- perforations (310) and the edges of strip of absorbent substrate (202) fall over the corresponding two adhesive bands (224a, 224b) provided on the first fold (221 ).

Furthermore, at step (1 10) the web (201 ) having strip of absorbent substrate (202) and folded as explained at step 108, is sealed at the adhesive bands (224a, 224b) by using a pressing roller (225) to form a continuous tube (318) taken on a roll

(319) .

Once the continuous tube (318) is formed, then it is cut into tube pieces (320) of preset length in accordance with the desired package length. These tube pieces

(320) may be then formed into packages of any desired shape and size. In an exemplary embodiment, the tube pieces (320) are formed into water resistant packages (322) with valve. However, it may be contemplated that the type of package (322) is exemplary and is not to be construed in a limiting manner. For example, the continuous tube (318) may be used to make flat bottom packages, two, three, and four side gusseted packages, pinch bottom packages, etc. The method (100) and the steps disclosed herein under are with respect to forming a water resistant package with valve, as the invention is related to packages where the product is filled under high pressure as a mixture of air with powder / granules of the product.

For example, at step (1 12), tube pieces (320), hereinafter referred to as the tubes (320), are cut in accordance with the desired package length such that each of the tube piece (320) has at least two open ends - a first open-end (324) and a second open-end (326) (as shown in FIGS. 4A & 4B(i)).

At step (1 14), pairs of flaps - a first pair of flaps (F1 , F2) and a second pair of flaps (F3, F4) are formed at each of the first open-end (324) and the second open- end (326) respectively (as shown in FIGS. 4B and 4C).

In accordance with an embodiment of the invention, step (1 14) further includes folding of the open-ends (324, 326) of the tube (320), spreading of the mouth of the folded open-ends (324, 326) of the tube (320), and flattening of each spread mouth of the folded open-ends to form the pair of flaps (F1 , F2 and F3, F4). In an embodiment, the two ends (324, 326) are folded as shown in FIGS. 4B(ii) and (iii) and 4C(ii) and (iii) respectively.

In an embodiment, open-ends (324, 326) are spread by means of suction cups (327). It should be noted that FIG. 4B(iv) and 4C(i) shows the spreading and flattening of the first open-end (324) of the tube (320). The same is done on the second open-end (326) as well (shown in FIG. 4C(iv) and 4D(i)).

Further, at step (1 16), a cut laminate piece (328) is sealed to the second pair of flaps (F3, F4) on the second open-end (326) as shown in FIG. 4E (i). At step (120), flattening of both the pairs of flaps (F1 , F2 and F3, F4) is done, whereby the cut laminate piece (328) already sealed to the second pair of flaps (F3, F4) is folded to form a valve (330) shown in FIG. 4E(ii). At step (122), sealing of a pre cut-cover patch (332) onto each of the flattened pairs of flaps (F1 , F2 and F3, F4) is done to close the open-ends of the tube (320) to form the package (322) as shown in FIG. 4C(iv) and FIG. 4F(ii). Here, the sealing of a pre cut-cover patch (332) completely closes and seals the first open-end (324) and the package is filled with the content through the valve (330) formed at the second end (326). It may be contemplated that the package may be filled through the valve (330) by using a high pressure nozzle (not shown) which sprays the air - product mixture, such as cement.

According to an embodiment of the present invention, the cut laminate piece (328) is cut from a roll (334) by means of a cutter (C2). As shown in FIG. 4D(ii), the cut laminate piece (328) is protruding out of the edges of the tube (320) by an offset distance "Do" and mouth distance "Dm" from the side of flap F4. As a result, the valve (330) formed subsequently has a mouth for filling from the side of the package (322).

In some embodiments, the mouth distance Dm can be zero or null so that valve (330) does not protrude out of the side of the package (322). In an embodiment of the present invention, an open end of the valve (330) can be closed / sealed at the side ends of the bag, so that the insects and unwanted elements can be restricted from entering the package (322). This may be required especially in case of packaging of food articles. It may be contemplated that the open mouth of the valve (330) may be sealed directly through the inner surface material of the cut laminate piece (328) or may be folded and sealed using any sealing method known in the art.

In accordance with an embodiment of the invention as the cut laminate piece (328) is sealed at the second end (326) to the second pair of flaps (F3, F4), flaps (F3, F4) are flattened at step (1 18), along lines L3 and L4 respectively along with the cut laminate piece (328) as shown in FIG. 4E(ii). It should be noted that the flap to which the distance has been left or offset while sealing the cut laminate piece (328) should be flattened first and should be overlapped by the opposite flap. For example, flaps F3 and F4 are flattened in such a manner that enables forming the valve (330) from the cut laminate piece (328) as shown in FIG. 4E(ii). Similarly, the flaps (F1 , F2) are also flattened along lines L1 and L2 as shown in FIG. 4C(ii).

It may be noted that in the preferred embodiment, no cut laminate piece is provided at flaps F1 , and F2 and therefore, no valve formation happens thereat. Since the valve in the package is required at one end only, therefore placing cut laminate piece and forming the valve at the first end (324) is redundant and therefore not required. However, embodiments are possible where addition of a cut laminate piece and subsequent formation of valve at either or both the pair of flaps may be done. In an alternative embodiment, a valve in the form of an offline pre-formed tube can also be placed and sealed between flaps F3 and F4 to obtain a similar effect.

In an embodiment of the present invention, at step (120), the tube (320) is advanced for sealing of the pre-cut cover patch (332) onto the flattened pairs of flaps (F1 - F2 and F3-F4) as shown in FIG. 4C(iv) and FIG. 4F(ii). The flaps are so flattened that the edges meet at the center. In some embodiments they can be overlapping each other also. The cover patch (332) is in the roll form on a cover patch roll (332A and 332B) and is cut by means of a cutter (C1 ) as shown in FIG. 4C(iv). The cover patch (332) can also be fed in precut form using suitable mechanism.

FIG. 5 is a cross sectional view of the web (201 ) depicting the structure thereof, in accordance with an embodiment of the present invention. Web (201 ) is a printed or unprinted woven fabric made of a base layer (502) of a woven polymeric material such as Woven Polypropylene (WPP) or woven High Density Polyethylene (HDPE) having a first surface (outer surface 504) and a second surface (inner surface 506).

First surface (504) of the base layer (502) is provided with hot extrusion coating (508) to make the first surface (504) conducive to printing. The hot extrusion coating (508) may be of Polypropylene or Polyethylene or a combination of both.

Subsequently, the web (201 ) may be printed on the first surface (504) over the hot extrusion coating shown as printed layer (510). The printed layer (510) may be further coated with E-beam curable layer or UV curable layer (512). It has been discussed later that curable layer may be applied on the whole surface of the web (201 ) excluding the portion of the surface along the edge (306b) of the web (201 ) which is overlapped by the other edge (306a) of the web (201 ) and sealed using hot air in particular over other methods of sealing. However same principle may be adopted if curable layer affects the sealing by any other method adversely.

As shown in FIG. 5A, in an embodiment, a film such as Biaxially Oriented Polypropylene (BOPP) or Biaxially Oriented Polyethylene terephthalate (BOPET) (512A), may be surface printed or reverse-printed with text, graphics and / or product labeling etc., shown as (51 OA) and then adhered to the first surface (504A) of the base layer (502A) over the hot extrusion coating layer (508) over the base layer (502A) using adhesives, hot extrusion lamination or some other known means of attaching the two layers.

Inner surfaces (506, 506A) may or may not be coated with hot extrusion layer (508A) of Polypropylene or Polyethylene or a combination of both and no printing or curing is performed on inner surface (506, 506A) generally. The purpose of such coating is to provide smooth inside surface.

In various embodiments, the structure of the web of the pre-cut cover patch (332) is either similar to the web (201 ) or WPP / WPE fabric or WPP / WPE fabric with extrusion coating of Polypropylene or Polyethylene or a combination of both on one side or both the sides which may be unprinted or printed on outside and may or may not be subsequently coated with E-beam cured layer or UV cured layer (512), duly cured. However, the cover patch (332) web may also be printed or unprinted, single layer or multilayer film or laminate having compatible surface material for sealing with flaps surface F1 , F2, F3 & F4. The substrate for cut laminate piece (328) for making the valve (330) may be made up of either WPP / WPE fabric or WPP / WPE fabric with extrusion coating of Polypropylene or Polyethylene or a combination of both, on one side or both the sides. However the substrate for cut laminate piece (328) may also be single layer or multilayer film or laminate having compatible surface material for sealing with flaps surface F1 , F2, F3, F4 and cover patch (332).

In various embodiments, various sealing steps in method (100) may be done using heat sealing, sealing with hot melt adhesive, hot air sealing, ultrasonic sealing, sealing using glue, sealing with hot extrusion layer or by Laser welding. The hot air sealing is done at temperature of about 700 deg. Celsius.

In an embodiment, where sealing at step (1 12) is performed by means of hot air, the surfaces of the web (201 ) in contact, which need to be hot air sealed, should not have E-beam cured layer or UV cured layer (512). Hence the band on the surface along the edge (306b) of the web (201 ) which is overlapped by the other edge (306a) of the web (201 ) is excluded from E-beam cured layer or UV cured layer (512). Similarly for hot air sealing at step (1 16) and (120) the surface of F1 , F2, F3 and F4 coming in contact with the cover patch (332), should also be without E-beam cured layer or UV cured layer (512). To achieve this, uncoated bands are left after printing on the web (201 ) across it's width at predefined pitch depending upon the length of the cut tube required. The width of the uncoated bands is decided based upon the width of the sealing surfaces of the flaps F1 , F2, F3 and F4.

However same principle may be adopted if E-beam cured layer or UV cured layer (512) adversely affects the sealing by any other method.

The sequence of the steps and each sub-step thereof of process (100) may be broken, altered and adjusted depending upon the requirement based upon constraints of space and machine design in-line with process and manufacturing optimization.

FIG. 6 illustrates an exemplary water resistant woven package (322) with valve, obtained from the method (100), according to an embodiment of the present invention. The package (322) includes a first panel (604) and a second panel (606) joined at a longitudinal seals (608a & 608b). According to an embodiment of the present invention, the package (322) includes overlapping edges of web (201 ) having nano-perforations (310 & 312) at a predefined location and a strip of absorbent substrate (202) between the nano-perforated and overlapping web surfaces.

Further, the package (322) includes the valve (330) having a valve open mouth (610) which may be closed or sealed after filling the package (322) with the desired content in order to provide sealed package (322). In an embodiment of the present invention, the open mouth (610) may be sealed by sealing the inner surfaces of the valve (330) using any sealing methods known in the art. In an alternative embodiment, the protruding valve (330) may be folded and sealed to close the bag (322) and provide a sealed package (322).

The water resistant package (322) with valve (330), obtained from the method (100) is nano-perforated which allows air already inside the package to exit the package while filling the high pressure air - product mixture into the package (322). Further, in order to prevent the water ingress through these nano-perforations (308), the strip of absorbent substrate (202) is provided, which absorbs the little water that may enter through the nano-perforations (308). Therefore, the package (322) provides leak resistant and water resistant packaging of the products, such as cement, building materials, food grains, pet food etc., and simultaneously allows easy de-aeration of the package (322) while filing the product therein. Furthermore, the package (322) is easy to manufacture and cost efficient as well.

The foregoing descriptions of specific embodiments of the invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. It is understood that various omission and substitutions of equivalents are contemplated as circumstance may suggest or render expedient, but such are intended to cover the application or implementation without departing from the spirit or scope of the invention.