Bag manufacturing method

Abstract

To provide a fabrication method for a bag that uses less plastic or no plastic and has desirable biodegradability.SOLUTION: A fabrication method for a bag, the bag made by overlapping two pieces, which have the same width in a lateral direction, of non-woven fabric made from a natural material and having biodegradability, and by bonding at least right and left side end parts with an adhesive, includes: an adhesive application step of applying the adhesive to joint parts of the two pieces of non-woven fabric; a non-woven fabric overlapping step of overlapping the two pieces of non-woven fabric; a mount sandwiching step of sandwiching upper and lower parts of the two pieces of non-woven fabric with two pieces of mount; and a press bonding step of bonding the joint parts to form the bag by pressing the joint parts via the two pieces of mount. Accordingly, since the adhesive application can be limited only to the joint parts and the area to be used is reduced, the amount of adhesive used can be reduced. In addition, although the adhesive may exude to a rear surface of the non-woven fabric during press bonding, it is possible to prevent the adhesive from adhering to production equipment and the like by using the mount.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing a pouch, and more particularly to a method for manufacturing a pouch having good biodegradability. [Background technology]

[0002] In recent years, from the perspective of protecting the global environment, there has been a growing demand for plastic-reduced or plastic-free bags, for example, for storing electronic devices. In addition, there has been a shift from conventional petroleum-derived plastics to biomass-derived plastics and those with good biodegradability.

[0003] One such packaging bag is the bag disclosed in Patent Document 1. This bag is formed by stacking a first sheet and a second sheet of equal width, each of which has a first layer made of a nonwoven fabric made of pulp or cotton and a second layer made of a material with excellent heat-sealing properties and laminated on the inward surface of the first layer, the second layer of the first sheet and the second layer of the second sheet being arranged to face each other, and at least both side edges have sealed portions welded to each second layer by heat sealing.

[0004] That is, instead of the conventional petroleum-derived plastic sheet bags, the bags are made by using a pulp or cotton nonwoven fabric as the base material and providing the inner surface with a thin layer of polyethylene resin (PE resin), a material with excellent heat-sealing properties. The inner heat-seal layer prevents the pulp or cotton nonwoven fabric from coming into direct contact with the contents and causing scratches, while also allowing them to be welded by heat sealing. Note that Figure 1 of Patent Document 1 shows a bag made by folding a strip-shaped sheet and welding both side edges, and Figure 9 shows a bag made by welding three sides of two separate sheets.

[0005] Here, the heat seal layer is thin, so plastic is reduced, and if biodegradable materials such as PLA resin (polylactic acid), PBS (polybutylene succinate), or PBAT (polybutylene adipate terephthalate) are used as the heat seal layer, there is an advantage in that waste is reduced.

[0006] Another example of a product using such a bag is the biodegradable disposable warmer disclosed in Patent Document 2. This disposable warmer is produced by laminating a polylactic acid film and paper or nonwoven fabric made from natural fibers to produce a biodegradable laminate, and then heat-sealing the surfaces of the polylactic acid film of this laminate to form a biodegradable packaging material with the natural fiber paper or nonwoven fabric surface facing outward, and then containing a breathable exothermic composition in the biodegradable packaging material.

[0007] That is, as described in Example 1 in paragraph 0023, for example, a two-layer biodegradable laminate was formed by heat-pressing a cotton nonwoven fabric onto one side of a 15 μm-thick polylactic acid film, and the polylactic acid film surfaces were heat-sealed together to form a bag with the cotton nonwoven fabric side on the outside and the polylactic acid film side on the inside. 14 g of a breathable exothermic composition used in commercially available hand warmers was placed in this biodegradable packaging material to produce a disposable hand warmer.

[0008] As stated in paragraph 0020, polylactic acid has excellent biodegradability, so that this disposable warmer will be rapidly biodegraded even if disposed of in the soil as industrial waste after use, and is effective in reducing waste. Moreover, by inserting an adhesive layer containing a natural polymer as an active ingredient, this natural polymer becomes a nutrient source for microorganisms, thereby accelerating the biodegradation rate and contributing even more effectively to waste reduction. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Utility Model Registration No. 3241249 [Patent Document 2] Japanese Patent Application Laid-Open No. 2003-250830 Summary of the Invention [Problem to be solved by the invention]

[0010] However, the technology described in Patent Document 1 uses a heat-sealable layer on a pulp or cotton nonwoven fabric, and a thin plastic layer made of a material with excellent heat-sealing properties is laminated at least in the area where the contents are placed, which has the disadvantage of using a large amount of plastic.

[0011] In addition, the technology described in Patent Document 2 involves laminating a polylactic acid film with paper or nonwoven fabric made from natural fibers to produce a biodegradable laminate, thereby forming a biodegradable packaging material. Here, polylactic acid is a biomass plastic made from plant-derived starch and sugar through a scientific process, and since the plants that serve as the raw material can be harvested every year, it is considered a material that contributes to a sustainable society.

[0012] However, polylactic acid is considered to be difficult to decompose in normal soil or water environments, although it decomposes in high-temperature and humid environments such as compost. In other words, the technology described in Patent Document 2 also has the disadvantage of using a large amount of plastics that are difficult to decompose.

[0013] An object of the present invention is to provide a method for producing a bag body that is plastic-reduced, using a reduced amount of plastic, or plastic-free, and that has good biodegradability. [Means for solving the problem]

[0014] In order to solve the above problems, the present invention employs the following configuration.

[0015] The present invention relates to a method for manufacturing a bag body having a first joint formed by overlapping a first nonwoven fabric and a second nonwoven fabric of equal width in the horizontal direction and joining at least the left and right side edges with an adhesive. The first nonwoven fabric and the second nonwoven fabric are made of biodegradable nonwoven fabrics made from natural materials, and the method includes an adhesive application process for applying adhesive to a first joint between the first nonwoven fabric and the second nonwoven fabric; a nonwoven fabric overlapping process for overlapping the first nonwoven fabric and the second nonwoven fabric to which the adhesive has been applied; a backing sandwiching process for sandwiching the top and bottom of the overlapped first nonwoven fabric and second nonwoven fabric between a first backing and a second backing; and a press joining process for pressing the first joint between the first nonwoven fabric and the second nonwoven fabric sandwiched between the first backing and the second backing via the first backing and the second backing to join the first joint and form a bag body.

[0016] Furthermore, at least the portions of the first and second backing sheets facing the first joint are provided with non-adhesive portions coated with a non-adhesive agent that prevents the first and second non-woven fabrics from adhering to the first and second backing sheets even when adhesive is applied, and the size of the non-adhesive portions is formed larger than the size of the first joint portion.

[0017] The first and second backing sheets also have slits or notches at the same opposing positions, and the method is characterized by including a bag removal step in which the bag sandwiched between the first and second backing sheets is removed by gripping and pulling the bag at the slit or notch.

[0018] The method is also characterized in that the first backing sheet and the second backing sheet are supplied continuously in a strip shape, and the first nonwoven fabric and the second nonwoven fabric are supplied in a continuous strip shape to form a bag body continuously, and includes a predetermined size cutting process in which the bag body is cut to a predetermined size together with the first backing sheet and the second backing sheet.

[0019] The bag body, which is continuous with the first backing and second backing that are continuous in a strip shape, is fixed at a second joint where a portion is glued, and is characterized in that after being cut to a predetermined size in the predetermined size cutting process, a second joint cutting process is provided in which the second joint between the first backing, the second backing, and the bag body is cut, and after the second joint is cut, the bag body is removed in the bag body removal process.

[0020] The second joint cutting step and the bag removing step are characterized in that they are performed with a plurality of bags stacked one on top of another.

[0021] The method is also characterized in that at least some of the adhesive application step, nonwoven fabric overlapping step, backing paper sandwiching step, pressure bonding step, and predetermined size cutting step are carried out by a roll collator.

[0022] The adhesive used to bond the first bonding portion is a biodegradable adhesive made from natural materials. [Effects of the Invention]

[0023] According to the present invention, since it has the above-mentioned characteristics, the following becomes possible.

[0024] A method for manufacturing a bag body having a first joint portion formed by overlapping a first nonwoven fabric and a second nonwoven fabric, each having the same predetermined width in the lateral direction, and joining at least the left and right side edges with an adhesive, wherein the first nonwoven fabric and the second nonwoven fabric are made of biodegradable nonwoven fabrics made from natural materials, and the method includes an adhesive application step of applying adhesive to the first joint portion of the first nonwoven fabric and the second nonwoven fabric, a nonwoven fabric overlapping step of overlapping the first nonwoven fabric and the second nonwoven fabric to which the adhesive has been applied, and a first support step of joining the top and bottom of the overlapped first nonwoven fabric and the second nonwoven fabric. The method includes a backing sandwiching step in which the first nonwoven fabric and the second nonwoven fabric are sandwiched between paper and a second backing, and a pressure joining step in which the first joint of the first and second nonwoven fabrics sandwiched between the first and second backings is pressed via the first and second backings to join the first joint and form a bag. This means that only the joint between the first and second nonwoven fabrics is bonded with adhesive, and even if the adhesive is made of plastic, the adhesive can be limited to the joint, reducing the area used and therefore the amount used. Furthermore, if adhesive is applied to the nonwoven fabric, it can seep out onto the back of the nonwoven fabric during pressure joining, but even if the adhesive does seep out, the backing can prevent the adhesive from adhering to manufacturing equipment, etc.

[0025] In addition, at least the portions of the first backing sheet and the second backing sheet facing the first joint are provided with non-adhesive portions coated with a non-adhesive agent that prevents the first nonwoven fabric and the second nonwoven fabric from adhering to the first backing sheet and the second backing sheet even if adhesive is applied, and the size of the non-adhesive portions is formed to be larger than the first joint portion, so that adhesive that has seeped out onto the back surface of the nonwoven fabric adheres to the backing sheet, preventing the backing sheet and the nonwoven fabric from being joined at the first joint portion, and even if there is a slight misalignment between the first joint portion and the non-adhesive portions, this misalignment can be absorbed.

[0026] In addition, the first and second backing sheets have slits or notches at opposing positions, and a bag removal process is provided in which the bag sheet sandwiched between the first and second backing sheets is removed by grasping and pulling the bag sheet at the slit or notch, making it possible to smoothly remove the bag sheet sandwiched between the backing sheets without having to flip the backing sheets over.

[0027] In addition, the first backing sheet and the second backing sheet are supplied continuously in a strip shape, and the first nonwoven fabric and the second nonwoven fabric are supplied in a continuous strip shape to form bag bodies continuously, and a predetermined size cutting process is provided in which the first backing sheet and the second backing sheet are cut to a predetermined size, making it possible to manufacture bag bodies in a continuous state.

[0028] In addition, the bag body, which is continuous with the first and second backing sheets that are continuous in a strip shape, is fixed at a second joint where a portion is glued, and after being cut to a predetermined size in the predetermined size cutting process, a second joint cutting process is provided in which the second joint between the first and second backing sheets and the bag body is cut, and the bag body is removed in the bag body removal process after the second joint is cut, so that the bag body and backing sheets do not shift in position and can be cut accurately to the predetermined size.

[0029] Furthermore, the second joint cutting step and the bag removal step are performed with a plurality of bags stacked on top of each other, so that the bags can be removed all at once.

[0030] Furthermore, at least some of the adhesive application process, nonwoven fabric overlapping process, backing paper sandwiching process, pressure bonding process, and predetermined size cutting process are performed using a roll collator, which allows for accurate mass production.

[0031] Furthermore, the adhesive used to join the first joint is a biodegradable adhesive made from natural materials, making it possible to manufacture a plastic-free or nearly plastic-free bag body that has good biodegradability. [Brief explanation of the drawings]

[0032] [Figure 1] 1 is a perspective view showing a bag body according to a first embodiment of the present invention. [Figure 2] 1 is a perspective view showing an outline of a method for manufacturing a bag body according to a first embodiment of the present invention. [Figure 3] FIG. 3 is a perspective view showing details of a method for manufacturing a bag body according to the first embodiment of the present invention. [Figure 4] 1A and 1B show a work-in-progress of a bag body according to a first embodiment of the present invention, in which (A) is a perspective view of the work-in-progress, and (B) is a perspective view showing the configuration of the work-in-progress. [Figure 5] 1A and 1B show a manufacturing method for finishing a work-in-progress bag body according to a first embodiment of the present invention, in which (A) and (B) are perspective views of the manufacturing method, and (C) is a perspective view showing the finished state of the bag body. [Figure 6] 1 is a perspective view showing an example of use of a bag body according to a first embodiment of the present invention. [Figure 7] 3 is a flowchart showing a method for manufacturing a bag according to the first embodiment of the present invention. [Figure 8] FIG. 10 is a perspective view showing a bag body according to a second embodiment of the present invention. [Figure 9] FIG. 10 is a perspective view showing details of a method for manufacturing a bag body according to a second embodiment of the present invention. [Figure 10] 10A and 10B show a work-in-progress of a bag body according to a second embodiment of the present invention, in which (A) is a perspective view of the work-in-progress and (B) is a perspective view showing the configuration of the work-in-progress. [Figure 11] 10A and 10B show a manufacturing method for finishing a work-in-progress bag body according to a second embodiment of the present invention, in which (A) and (B) are perspective views of the manufacturing method, and (C) is a perspective view showing the finished state of the bag body. DETAILED DESCRIPTION OF THE INVENTION

[0033] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following explanation, when a bag with a step at the open end is placed flat, the open end is the front direction and the closed end is the rear direction, and the shorter side of the nonwoven fabric that makes up the bag is the upper direction (top direction) and the opposite side is the lower direction (back direction), and these directions are referred to as the front-to-back direction (or vertical direction), left-to-right direction (or horizontal direction), and up-down direction. However, the directions such as front-back, up-down, left-right, etc. shown below are shown for the convenience of explanation, and the application of the present technology is not limited to these directions.

[0034] The bag manufacturing method of the present invention uses biodegradable nonwoven fabrics made from natural materials to produce bags by overlapping a first nonwoven fabric and a second nonwoven fabric of equal width in the lateral direction. The method uses adhesive only at the joint between the first and second nonwoven fabrics. Even if the adhesive is plastic, the adhesive area required is reduced, enabling the production of bags with good biodegradability and reduced plastic content. Furthermore, by using a biodegradable adhesive made from natural materials, it is possible to produce bags that are plastic-free or close to being plastic-free, yet with good biodegradability. While adhesive can seep out onto the backside of the nonwoven fabric when applied to the nonwoven fabric and pressure-bonded, this method proposes a manufacturing method that allows for smooth production even if the adhesive seeps out. Furthermore, this method proposes a manufacturing method that utilizes a roll collator, a finishing device that typically collates and folds multiple parts of rolled printed materials, performs partial siliconization, die-cutting, and other processes, to mass-produce such bags. Details of this method are described below.

[0035] (First embodiment) A method for manufacturing a bag body 1 according to a first embodiment of the present invention will be described with reference to FIGS. Fig. 1 is a perspective view showing the structure of bag body 1, Fig. 2 is a perspective view showing a simple method for manufacturing bag body 1, and Fig. 3 is a perspective view showing a method for manufacturing a work-in-progress of bag body 1 using a roll collator. Figs. 4(A) and (B) are perspective views showing the structure of the work-in-progress of bag body 1, Figs. 5(A) to (C) are perspective views showing the process from the work-in-progress to finishing bag body 1, Fig. 6 is a perspective view showing an example of how bag body 1 is used, and Fig. 7 is a flowchart showing the main steps of the manufacturing method.

[0036] As shown in Figure 1, the bag 1 of this embodiment is made by folding a strip of nonwoven fabric having a predetermined bag width W in two along a folding line with a step at the open end, and then joining the left and right side edges with adhesive. Here, the lower nonwoven fabric with a longer vertical length is referred to as the bottom nonwoven fabric (first nonwoven fabric) 2, the upper nonwoven fabric with a shorter vertical length is referred to as the top nonwoven fabric (second nonwoven fabric) 3, and the joints at both ends are referred to as the end joints (first joints) 4. The nonwoven fabric of this bag 1 is made from biodegradable natural materials.

[0037] Figure 2 shows how bag 1 is manufactured, focusing on bag 1 with a bag width W. As shown in step (a) (adhesive application step) of Figure 2, adhesive is first applied to the edge joining portion 4 of the joining surfaces of bottom nonwoven fabric 2 and top nonwoven fabric 3. Here, adhesive is not applied near the folding lines, as a jig will be inserted during mass production. Next, the nonwoven fabrics are overlapped as shown in step (b) (nonwoven fabric overlapping step) of Fig. 2. Here, the length in the vertical direction of the lower nonwoven fabric 2 is formed slightly longer than the vertical dimension of the finished bag body 1.

[0038] As shown in steps (c) and (d) of Figure 2, a lower backing sheet 100 and an upper backing sheet 200 are prepared before the next step. Here, the lower backing sheet 100 and the upper backing sheet 200 are made of paper such as fine paper or a thin plastic sheet, and are also called carrier sheets. The lower backing sheet 100 in step (c) has a width equal to the bag width W, and its vertical length is slightly longer in both the front and rear directions than the vertical length of the lower nonwoven fabric 2 in step (b) of Figure 2.

[0039] The portions of the lower base sheet 100 and the upper base sheet 200 facing the end joint 4 have non-adhesive portions (non-adhesive portions) 110, 110 that are larger than the end joint 4 and are printed with a non-adhesive agent such as silicone or silicone-like to prevent adhesive from adhering. Also, the center of the front side of the lower base sheet 100 has a bag body joint (second joint) 120 that is applied with adhesive and extends widthwise, and the front right corner has a notch (cutout) 130 that is cut out in a roughly triangular shape. The upper backing board 200 in step (d) has the same configuration as the lower backing board 100, and has non-adhesive portions (non-adhesive portions) 210, 210, a bag body joint portion (second joint portion) 220, and a notch portion (notch) 230.

[0040] As shown in step (e) of Figure 2 (backing paper sandwiching step), first, the bag body 1 of step (b) of Figure 2 is placed on the lower backing paper 100 of step (c). At this time, the bag body width W is the same and fits perfectly in the width direction, and the lower backing paper 100 protrudes beyond the bag body 1 in both the front and rear longitudinal directions. In addition, the rear part of the bag body joint 120 is covered by the front part of the bag body 1, and the front part of the bag body joint 120 is exposed as is.

[0041] As shown in step (f) of Figure 2 (mounting paper sandwiching step), next, the upper mount 200 of step (d) is overlapped on the one of step (e) in the same manner. At this point, the outer shapes of the lower mount 100 and the upper mount 200 are perfectly overlapped. In addition, the corners of the bag body 1 protrude and are exposed from the cutouts 230, 130. In this explanation, the lower backing 100 and the upper backing 200 are stacked in separate steps and the bag body 1 is sandwiched between them, but this is for the purpose of making the explanation easier to understand using the diagrams. Of course, the top and bottom backings can also be sandwiched between them simultaneously.

[0042] As shown in step (g) (pressure bonding step) in Figure 2, in this step, the cross-hatched areas of the end joints 4, 4 and the bag joints 120, 220 are pressed with a pressure roller or the like to bond the respective joints. When the joints are pressed at this time, the adhesive will seep out onto the back surface of the nonwoven fabric. However, because the pressure is applied via the lower backing 100 and upper backing 200, the adhesive does not adhere to the manufacturing equipment, such as the pressure rollers. This reduces the maintenance of the pressure rollers and the like.

[0043] In addition, non-adhering portions 110, 110 and 210, 210 are formed on the lower backing paper 100 and the upper backing paper 200 facing the end joint portions 4, 4, respectively, so that even if the adhesive seeps out, the lower backing paper 100 and the upper backing paper 200 will not be joined to the bag body 1. On the other hand, the bag body 1, the lower backing board 100, and the upper backing board 200, which face the bag body joints 120, 220, are joined and fixed together at the bag body joints 120, 220. By fixing the lower backing board 100, the upper backing board 200, and the bag body 1 together in this manner, there is no mutual misalignment, which has the effect of making them easier to handle.

[0044] As shown in step (h) of Figure 2, in this way, a work-in-progress of the bag body 1 is completed in which the bag body 1, the lower backing board 100, and the upper backing board 200 are integrated together. Since a long piece is used in mass production, it is cut along parting lines to the bag body width W, and the work-in-progress of the bag body 1 is created.

[0045] Steps (i) to (k) in Figure 2 will be used to explain how the bag 1 work-in-progress produced in step (g) in Figure 2 is turned into the finished bag 1. As shown in (i) in Figure 2 (second joint cutting step), the bag joints 120, 220 are cut and removed from the bag 1, lower backing sheet 100, and upper backing sheet 200. For this reason, the vertical length of the lower nonwoven fabric 2 of the bag 1 is formed slightly longer than the dimensions of the finished bag 1. Furthermore, even after the bag joints 120, 220 are cut, the portions behind the cutouts 230, 130 remain, and the corners of the bag 1 are exposed.

[0046] As shown in step (j) (bag removal step) in Fig. 2, the rear portions of the lower backing board 100 and the upper backing board 200 that do not sandwich the bag 1 are fixed, and the front right corner of the bag 1 exposed from the cutouts 130 and 230 is pinched and pulled out, thereby obtaining the bag 1 of the product shown in step (k) in Fig. 2. Then, the bag 1 is packaged in step (k) and shipped.

[0047] Next, we will explain how the process explained in Fig. 2 was realized in mass production using Fig. 3 to Fig. 5. Each process in Fig. 3 is given the same symbol as the process used in Fig. 2, to clearly show which process in Fig. 2 it corresponds to.

[0048] As shown in Figure 3, the work-in-process of the bag body 1 is produced using a roll collator. As mentioned above, a roll collator is a finishing device that generally collates and folds multiple parts of a roll of printed material, performs partial siliconization, die-cutting, etc. The strip-shaped paper supplied in roll form has sprocket holes, which are evenly spaced continuous holes, on both ends, allowing for extremely accurate transport. In the present invention, by using this strip-shaped paper as the lower backing 100 and upper backing 200, we have succeeded in dramatically increasing the productivity of the bag body 1. In the following explanation, the nonwoven fabric and each backing paper process are shown using diagrams of the products that have been produced as a result of printing, coating, pressing, and cutting, but it goes without saying that each of these processes is the result of using a roll collator in the usual manner.

[0049] As shown in Figure 3, the bag having the width W described in Figure 2 is manufactured by arranging the dividing lines of the bag width W in contact with each other in the longitudinal direction of the long nonwoven fabric and each backing sheet. First, as shown in step (a) of Figure 3, adhesive is applied to a total of four end joints 4 of a long piece of nonwoven fabric per bag width W, two on the bottom nonwoven fabric 2 and two on the top nonwoven fabric 3, using pattern glue processing.

[0050] Next, as shown in step (b) of Figure 3, the nonwoven fabric coated with adhesive is plow-folded along the folding line using a plow 300 to cut it in half, and the upper nonwoven fabric 3 and the lower nonwoven fabric 2 are overlapped. As mentioned above, no adhesive is applied near the folding line, so the adhesive does not adhere to the plow 300. In this case, other folding methods may be used instead of plow folding. In either case, the nonwoven fabric is folded in half along the folding line and overlapped.

[0051] In steps (c) and (d) of Figure 3, strip-shaped bottom backing paper 100 and top backing paper 200 are prepared. The bottom backing paper 100 and top backing paper 200 have the same length in the short side direction, and sprocket holes for feeding are provided on both sides. The length in the short side direction of the part inside the sprocket holes is the same as the length in the vertical direction of bottom backing paper 100 or top backing paper 200 in steps (c) and (d) of Figure 2. The part inside the sprocket holes is the part used to create the bag body 1 in process.

[0052] 3, the portion of the lower backing sheet 100 facing the end joint 4 has non-adhesive areas 110, 110 that are wider than the end joint 4 and are pattern-printed with silicone or the like. Also, a diagonal cut is made in the front right corner of the lower backing sheet 100, and this cut will form a notch 130 in the bag body 1 in-process.

[0053] The lower mount 100 up to this point may be created and prepared in advance. Here, a line glue is applied to the center of the front side of the lower backing board 100 by a nozzle (or dispenser) 400, forming a bag body joint portion 120 to which adhesive is applied. The upper backing sheet 200 in step (d) is similar to the lower backing sheet 100, and has non-adhesion portions 210, 210, a notch portion 230, and a bag body joining portion 220 formed therein.

[0054] As shown in step (e) of Figure 3, first, the nonwoven fabric in which the upper nonwoven fabric 3 and the lower nonwoven fabric 2 are overlapped in step (b) is placed on the lower backing 100. Here, it is necessary to align the relative positions of the end joint portion 4 and the non-bonded portion 110, but the non-bonded portion 110 is formed slightly wider than the end joint portion 4 so that it is okay if there is some misalignment. Also, here, the rear portion of the bag body joint portion 120 is covered by the lower nonwoven fabric 2, while the front portion is left exposed.

[0055] Next, as shown in step (f) of Figure 3, the upper backing sheet 200 is placed on top of the lower backing sheet 100 in the same manner. Here, the lower backing sheet 100 and the upper backing sheet 200 are placed on top of each other, including the sprocket holes, and the upper nonwoven fabric 3 and the lower nonwoven fabric 2 sandwiched between them are sandwiched between the lower backing sheet 100 and the upper backing sheet 200. In this explanation, the lower backing 100 and the upper backing 200 are stacked in separate steps and the bag body 1 is sandwiched between them, but this is for the purpose of making the explanation easier to understand using the diagrams. Of course, the top and bottom backings can also be sandwiched between them simultaneously.

[0056] As shown in step (g) of Figure 3, the end joints 4, 4 and the bag joints 120, 220 are pressed with a pressure roller or the like to join the respective joints. When the joints are pressed at this time, the adhesive will seep out onto the back surface of the nonwoven fabric. However, because the pressure is applied via the lower backing 100 and the upper backing 200, the adhesive does not leak from the lower backing 100 and the upper backing 200, and the adhesive does not adhere to manufacturing equipment such as the pressure rollers. This reduces the maintenance of the pressure rollers and the like.

[0057] In addition, since non-adhering portions 110, 110 and 210, 210 are formed on the lower backing paper 100 and the upper backing paper 200 facing the end joint portions 4, 4, even if the adhesive seeps out, the lower backing paper 100 and the upper backing paper 200 will not be bonded to the lower nonwoven fabric 2 or the upper nonwoven fabric 3.

[0058] Meanwhile, the front end of the lower nonwoven fabric 2 facing the bag body joints 120, 220, the lower backing 100, and the upper backing 200 are joined and fixed together at the bag body joints 120, 220. That is, at the bag body joints 120, 220, the lower backing 100 and the upper backing 200 are joined together via the lower nonwoven fabric 2 at the rear of the bag body joint 120, and the lower backing 100 and the upper backing 200 are joined together directly at the front. By fixing them together in this way, there is no misalignment or the like, and they will not come apart, making them easier to handle.

[0059] In step (h) of Fig. 3 (predetermined size cutting step), the long piece is cut into pieces of bag width W, and the sprocket holes are removed to create work-in-progress bags 1. How this is done will now be described. As shown in step (h) of Figure 3, first, using a roller with a cutter or similar tool, cut the inside of the sprocket holes on both sides in the short direction along the dividing line of the bag width W, leaving the sprocket holes. Next, when the sprocket holes are cut out using a slitter or similar tool, the triangular parts with diagonal cuts are removed together with the sprocket holes, since the short cuts have already been made.

[0060] Then, as shown in step (h) of Figure 3, the bag body 1 is sandwiched between the lower backing sheet 100 and the upper backing sheet 200, and an integrated bag body 1 work-in-progress is completed, and the stacked bag body 1 work-in-progress is removed from the roll collator.

[0061] Figures 4(A) and (B) show details of the work-in-progress bag body 1, with Figure 4(A) being an oblique view from the front, and Figure 4(B) being an oblique view from the upper left of the work-in-progress bag body 1 when the lower backing paper 100 and upper backing paper 200 are flipped up relative to the bag body 1. As shown in FIG. 4(A), the right front corner of the lower nonwoven fabric 2 of the bag body 1 is exposed from the cutouts 130, 230 of the lower backing board 100 and the upper backing board 200. As shown in FIGS. 4(A) and 4(B), the bag 1, the lower backing board 100 and the upper backing board 200 are connected at their front ends by the bag joints 120 and 220 at their front ends.

[0062] 5(A), (B), and (C) explain the process of turning the work-in-progress bag body 1 produced in step (g) of Fig. 2 into the finished bag body 1. Fig. 5(A) shows step (i), Fig. 5(B) shows step (j), and Fig. 5(C) shows step (k).

[0063] As shown in step (i) of Figure 5(A), the rear part of the stacked bag bodies 1 work-in-progress where the bag bodies 1 are not sandwiched is fixed by clamper 500. Then, the bag body joint parts 120, 220 at the front part of the bag body 1 work-in-progress where the lower backing board 100, the upper backing board 200 and the bag bodies 1 are fixed together are cut along cutting line AA with a cutter 600 or the like. At this time, cutting line AA is located midway through cutout parts 130, 230, and the bag bodies 1 are exposed from the remaining cutout parts 130, 230 even after cutting.

[0064] As shown in step (j) of Figure 5(B), by grasping and pulling out the portions of the bag body 1 exposed from the cutout portions 130, 230 remaining after cutting, a bundle of bag bodies 1 can be removed. In this way, a bundle of bag bodies 1 of the product shown in step (k) of Figure 5(C) can be obtained. The bag bodies 1 are then packaged in step (k) and shipped.

[0065] FIG. 6 shows an example of how the bag body 1 is used. 6, this is an example of a protective bag used to store a small electronic device 700, etc. In this case, the electronic device 700, etc., comes into direct contact with the inner surface of the bag body 1, but the quality of the nonwoven fabric is improved, and scratches on the electronic device 700, etc., are suppressed.

[0066] FIG. 7 is a flowchart showing the main steps of the method for manufacturing the bag body 1. First, in the nonwoven fabric adhesive application step S10, adhesive is applied to predetermined locations on a strip of nonwoven fabric. Next, in the nonwoven fabric overlapping step S20, the nonwoven fabrics are overlapped to form a bag. Finally, in the backing paper sandwiching step S30, the bag is sandwiched between upper and lower strips of backing paper.

[0067] In the press-bonding process at S40, the bonded portion of the bag sandwiched between the upper and lower backing sheets is pressed to bond it. During this process, adhesive seeps out of the nonwoven fabric, but the backing sheets prevent the adhesive from adhering to other equipment. Then, in the cut-to-size process at S50, the bag is cut to the size of the work-in-progress. By performing the above steps using a roll collator, it is possible to mass-produce work-in-progress bags. Of course, performing only some of the above steps using a roll collator will also increase the efficiency of mass production.

[0068] In the bag joint cutting process of S60, the bag joints joining the bag to the upper and lower backing sheets are cut. Then, in the bag removal process of S70, the bag is pulled out from the backing sheets that had been holding it, completing the product bag. The completed bag is then packaged and shipped.

[0069] As biodegradable nonwoven fabrics made from natural materials, there are nonwoven fabrics made from ordinary rayon fibers, etc., but particularly preferred are Asahi Kasei's Bemliese (registered trademark), which is naturally derived and has excellent biodegradability, and Unitika's Cot Ace (registered trademark), which has excellent flexibility. Examples include Ecorona (registered trademark) manufactured by Daiwabo Rayon and TCF (registered trademark) manufactured by Futamura Chemical.

[0070] Other examples of biodegradable adhesives made from natural materials include H-BCB2 White manufactured by Resitex, which is made from natural rubber and other natural origins; biodegradable adhesive manufactured by Toyochem, which is a biomass adhesive; and Ecoad (registered trademark) manufactured by Toyo-Morton.

[0071] Furthermore, the bag 1 is configured by overlapping the lower nonwoven fabric 2, which has a longer vertical length at the bottom, with the upper nonwoven fabric 3, which has a shorter vertical length at the top, and providing a step at the front of the bag 1, but this is not limiting. This step does not have to be present, and the lower nonwoven fabric 2 and the upper nonwoven fabric 3 may have the same vertical length. This step is provided to make it easier to open the opening end when storing or removing a small electronic device 700 or the like from the bag 1.

[0072] Furthermore, in the bag body joints 120, 220, the rear part of the bag body joint 120 is joined to the lower backing 100 and the upper backing 200 via the lower surface nonwoven fabric 2, and the front part is joined to the lower backing 100 and the upper backing 200 directly, but this is not limiting. In other words, the part where the lower backing 100 and the upper backing 200 are directly joined may not be used, and the lower backing 100 and the upper backing 200 may be joined to each other via the lower surface nonwoven fabric 2 to form a single unit.

[0073] (Second embodiment) A method for manufacturing the bag body 1 according to the second embodiment of the present invention will be described with reference to FIGS. In the first embodiment, one sheet of nonwoven fabric is folded to form the bottom nonwoven fabric 2 and the top nonwoven fabric 3, and both sides are glued together to form the bag 1, but in this second embodiment, two sheets of nonwoven fabric having the same width but different vertical lengths are overlapped with each other along three sides excluding the open end, and joined with an adhesive to form the bag 1. Hereinafter, the same parts as in the first embodiment will be given the same reference numerals, and explanations will be omitted, and only the different parts will be explained in detail.

[0074] Fig. 6 is a perspective view showing the structure of the bag body 1, Fig. 9 is a perspective view showing a manufacturing method of the work-in-progress of the bag body 1 using a roll collator, Fig. 10(A)(B) are perspective views showing the structure of the work-in-progress of the bag body 1, and Fig. 11(A) to (C) are perspective views showing the process from the work-in-progress to finishing the bag body 1.

[0075] As shown in Figure 8, bag 1 of this embodiment has a bag width W and is made by overlapping two substantially rectangular nonwoven fabrics with different vertical lengths, a bottom nonwoven fabric 2 and an top nonwoven fabric 3, with the closed ends aligned in width and the open ends stepped, and then joining the three sides other than the open ends with adhesive. Here, the bottom nonwoven fabric with the longer vertical length is bottom nonwoven fabric 2, the top nonwoven fabric with the shorter vertical length is top nonwoven fabric 3, and the joints of the three sides are called end joints 4, 4, 4. As with the first embodiment, the nonwoven fabric of bag 1 is made from a biodegradable natural material.

[0076] As shown in Fig. 9, a work-in-progress of the bag body 1 is manufactured using a roll collator. The order of the steps is different from that of the first embodiment, but the main steps are the same. In the manufacturing method shown in Fig. 9, the open end of the bag body 1 is positioned front to back in the manner shown in Fig. 3, so the upper part of the paper surface of Fig. 9 will be described as the front, and the opposite side as the rear.

[0077] 9, in steps (m) and (n), strip-shaped lower base board 100 and upper base board 200 having the same length in the short direction are prepared. The lower base board 100 and upper base board 200 have sprocket holes on both sides for feeding, and the inner width of these holes is the part used to create the bag body 1 in process.

[0078] 9, the portion of the lower base board 100 facing the end joint portion 4 has a non-adhesive portion (non-adhesive portion) 110 that is larger than the end joint portion 4 described below and has silicone or the like printed in a strip shape in the longitudinal direction. Also, a substantially oval hole that is long in the width direction is opened in the center of the front side of the lower base board 100, forming a slit portion (slit) 140. In addition, between adjacent notches 140 on the front side of the lower backing board 100, a line glue process is performed using a nozzle (or dispenser) 400, forming a bag body joint (second joint) 120 to which adhesive is applied. The step (n) of the upper backing board 200 is similar to that of the upper backing board 200, and has a non-adhesive portion 210 and a slit portion 240, and a bag body joining portion 220 that has been line glued is formed.

[0079] Next, as shown in step (p) (adhesive application step) of Fig. 9, the lower nonwoven fabric 2 is placed on the lower backing 100 in step (m), and adhesive is applied to the lower nonwoven fabric 2 by pattern glue processing in a roughly U-shape with an opening at the front, forming an end joint portion (first joint portion) 4. Here, a portion of the roller used to place the lower nonwoven fabric 2 is formed with a narrow outer diameter so that the adhesive at the bag body joint portion 120 does not adhere to this roller. Here, in this step (p), the rear portion of the bag body joint portion 120 is covered by the lower nonwoven fabric 2, and the front portion is left exposed. The step (q) (adhesive application step) for the upper backing sheet 200 is the same as for the upper backing sheet 200, in which the upper nonwoven fabric 3 is placed and pattern glued to form the end joints 4.

[0080] Here, the end joints 4 were formed after the lower nonwoven fabric 2 and the upper nonwoven fabric 3 were placed on the lower backing 100 and the upper backing 200, respectively, but it is also possible to apply adhesive to the upper nonwoven fabric 3 and the lower nonwoven fabric 2 in advance, form the end joints 4, and then place them on the upper backing 200 and the lower backing 100. However, if the end joints 4 are formed after the fabric is placed on the lower backing 100 and the upper backing 200, the end joints 4 can be formed without misalignment with respect to the lower backing 100 and the upper backing 200. In any case, between steps (p) and (q), the lower nonwoven fabric 2 and the upper nonwoven fabric 3, on which the end joint portion 4 has been formed, are placed on the lower backing paper 100 and the upper backing paper 200.

[0081] 9 (nonwoven fabric overlapping step) (backing paper sandwiching step), the upper backing paper 200, on which the upper nonwoven fabric 3 has been placed, is placed on the lower backing paper 100, on which the lower nonwoven fabric 2 has been placed. Here, the lower backing paper 100 and the upper backing paper 200 are perfectly overlapped, including the sprocket holes, and the lower nonwoven fabric 2 and the upper nonwoven fabric 3 are sandwiched between the lower backing paper 100 and the upper backing paper 200. In other words, the nonwoven fabrics are overlapped and sandwiched between the backing papers at the same time.

[0082] As shown in steps (s) and (t) in Figure 9, the process after step (r) is the same as in the first embodiment. In step (s) (pressure bonding process), pressure is applied with a pressure roller or the like to bond the end joints 4, 4 and the bag body joints 120, 220. However, because the pressure is applied via the lower backing sheet 100 and the upper backing sheet 200, the adhesive does not adhere to the manufacturing equipment such as the pressure roller. Furthermore, because non-adhesive areas 110 and 210 are formed on the lower backing sheet 100 and the upper backing sheet 200 facing the end joints 4, 4, respectively, the lower backing sheet 100 and the upper backing sheet 200 will not bond to the lower nonwoven fabric 2 or the upper nonwoven fabric 3 even if the adhesive seeps out.

[0083] Meanwhile, the front end of the lower nonwoven fabric 2 facing the bag body joints 120, 220, the lower backing 100, and the upper backing 200 are joined and fixed together at the bag body joints 120, 220. By fixing them together in this manner, there is no misalignment when cutting, and they do not come apart, making them easier to handle. In step (t) of Figure 9 (predetermined size cutting step), the long piece is cut to a predetermined size for each bag width W, the sprocket holes are removed, and the work-in-progress bag 1 is created. Here, the front portions of the slits 140, 240, which were shaped like oval holes, are cut away, leaving slits with a roughly U-shaped recess.

[0084] Figures 10(A) and (B) show details of the work-in-progress bag body 1, Figure 4(A) is an oblique view from the front, and Figure 4(B) is an oblique view from the upper right of the work-in-progress bag body 1 when the lower backing paper 100 and upper backing paper 200 are flipped up relative to the bag body 1. As shown in FIG. 4(A), the front center portion of the lower nonwoven fabric 2 of the bag body 1 is exposed from the slits 140, 240 of the lower backing board 100 and the upper backing board 200. As shown in FIGS. 4(A) and 4(B), the bag 1, the lower backing board 100 and the upper backing board 200 are connected at their front ends by the bag joints 120 and 220 at their front ends.

[0085] Then, similarly to the first embodiment, the work-in-progress bag body 1 is turned into the finished bag body 1 through steps (u), (v), and (w) shown in Figures 11(A), (B), and (C), respectively. As shown in step (i) (second joint cutting step) of Figure 11(A), the rear part of the in-process bag body 1 is fixed by clamper 500. Then, the front part of the in-process bag body 1 is cut along cutting line BB at bag body joints 120, 220 using cutter 600 or the like. At this time, cutting line AA is located midway between approximately U-shaped slits 140, 240, and the bag body 1 is exposed from the remaining part after cutting.

[0086] As shown in step (v) (bag removal step) in Figure 11(B), a bundle of bags 1 can be removed by grasping and pulling out the portion of the bag 1 exposed from the remaining slits 140, 240 after cutting. In this way, a bundle of bags 1 can be obtained, as shown in step (k) in Figure 11(C). The bags 1 are then packaged in step (w) and shipped.

[0087] Now, referring to the flowchart of FIG. 7 showing the main steps of the manufacturing method of the bag body 1, it will be confirmed how this flowchart corresponds to the second embodiment. In the nonwoven fabric adhesive application step S10, adhesive is applied to predetermined locations on the upper and lower strip-shaped nonwoven fabrics. Next, in the second embodiment, the nonwoven fabric overlapping step S20 and the backing paper sandwiching step S30 are performed simultaneously in step (r), and the nonwoven fabrics are overlapped and sandwiched between the upper and lower backing papers.

[0088] In the press-bonding process at S40, the bonded portion of the bag sandwiched between the upper and lower backing sheets is pressed and bonded. During this process, adhesive seeps out from the nonwoven fabric, but the backing sheets prevent the adhesive from adhering to manufacturing equipment, etc. Then, in the cut-to-size process at S50, the bag is cut to the size of the work-in-progress. In the second embodiment, the above steps S10 to S50 are also performed using a roll collator, making it possible to mass-produce in-process bags.

[0089] In the bag joint cutting process of S60, the bag joints joining the bag to the upper and lower backing sheets are cut. Then, in the bag removal process of S70, the bag is pulled out from the backing sheets that had been holding it, completing the product bag. The completed bag is then packaged and shipped.

[0090] Note that the bag 1 is configured by overlapping the lower nonwoven fabric 2, which has a longer vertical length at the bottom, with the upper nonwoven fabric 3, which has a shorter vertical length at the top, and providing a step at the front of the bag 1, but this is not limiting. This step does not have to be present, and the lower nonwoven fabric 2 and the upper nonwoven fabric 3 may have the same vertical length. This step is provided to make it easier to open the opening end when storing or removing a small electronic device 700 or the like from the bag 1.

[0091] Furthermore, in the bag body joints 120, 220, the rear part of the bag body joint 120 is joined to the lower backing 100 and the upper backing 200 via the lower surface nonwoven fabric 2, and the front part is joined to the lower backing 100 and the upper backing 200 directly, but this is not limiting. In other words, the part where the lower backing 100 and the upper backing 200 are directly joined may not be used, and the lower backing 100 and the upper backing 200 may be joined to each other via the lower surface nonwoven fabric 2 to form a single unit.

[0092] As explained above in the first and second embodiments, according to the manufacturing method of this bag body 1, when adhesive is applied to the upper nonwoven fabric 3 and the lower nonwoven fabric 2, the adhesive may seep out onto the back surface of the nonwoven fabrics during pressure joining. However, because the nonwoven fabrics are sandwiched between the lower backing paper 100 and the upper backing paper 200, even if the adhesive seeps out, it is possible to prevent the adhesive from adhering to manufacturing equipment, etc., even during the cutting process, etc.

[0093] Furthermore, non-adhesion areas 110, 210 are provided on at least the portions of the lower backing sheet 100 and the upper backing sheet 200 facing the end joint portion 4, so that even if adhesive is applied, the bag body 1 will not adhere to the lower backing sheet 100 and the upper backing sheet 200. This prevents adhesive that has seeped out onto the back surface of the nonwoven fabric from adhering to the lower backing sheet 100 and the upper backing sheet 200 and joining the bag body 1. Furthermore, since the non-adhesion area 110 is formed larger than the end joint portion 4, even if there is some misalignment, this misalignment can be absorbed and it can also be accommodated if the adhesive overflows during pressure joining.

[0094] In addition, the lower backing board 100 and the upper backing board 200 have slits at the same opposing positions, and the bag body 1 sandwiched between the lower backing board 100 and the upper backing board 200 can be removed by gripping and pulling the bag body 1 at the slit, so that the bag body sandwiched between the backing boards can be smoothly removed without turning over the lower backing board 100 or the upper backing board 200. In addition, multiple bags 1 can be removed at once.

[0095] In addition, the lower backing 100 and the upper backing 200 are continuous strip-shaped sheets, and the upper nonwoven fabric 3 and the lower nonwoven fabric 2 are supplied in a continuous strip-shaped state to form the bag body continuously, and are configured to be cut to a predetermined width W together with the lower backing 100 and the upper backing 200, so that the bag body 1 can be manufactured in a continuous state.

[0096] Furthermore, the bag body 1, which is continuous with the lower backing board 100 and upper backing board 200 that are continuous in a strip shape, is fixed at bag body joints 120, 220 that are partially glued together, and after being cut to a predetermined width W, the bag body 1 is removed by cutting the bag body joints 120, 220, so that the bag body 1, the lower backing board 100, and the upper backing board 200 do not shift in position, and the bag body 1 can be accurately cut to the predetermined width W. This also makes it easier to handle work-in-progress.

[0097] Furthermore, the bag joint cutting process and bag removal process are carried out with multiple bags stacked on top of each other, making it possible to remove and manufacture bags in bulk, making the process suitable for mass production.

[0098] Furthermore, at least some of the adhesive application process, nonwoven fabric overlapping process, backing paper sandwiching process, pressure joining process, and specified width cutting process are performed by a roll collator, enabling mass production with high precision. Furthermore, the roll collator technology that has been cultivated up to now can be applied to the production of the bag body 1, making it possible to mass-produce the bag body 1 easily.

[0099] Furthermore, the adhesive used to join the end joints 4 is a biodegradable adhesive made from natural materials, so it is possible to manufacture bags that are plastic-free or close to being plastic-free, with the joints also being biodegradable, making it possible to greatly contribute to environmental issues.

[0100] The method for manufacturing a bag body according to the present invention is not limited to the embodiment described above and shown in the drawings, and various modifications can be made without departing from the spirit and scope of the invention. For example, in the above-described embodiment, the bag body is described as being made of a nonwoven fabric made of natural materials, but this is not limiting. It goes without saying that the bag body may also be made of thin paper made of natural pulp, fabric made of cotton thread, or the like. When adhesive is used to join such thin paper or fabric, the adhesive will seep out, but by sandwiching the bag body between backing sheets and applying pressure through the backing sheet, the adhesive can be prevented from adhering to the device.

[0101] W Bag width 1 bag body 2 Bottom non-woven fabric 3 Top non-woven fabric 4 End joint 100 Lower mount 110 Non-adhesive area 120 Bag joint 130 Notch 140 Notch 200 Upper mount 210 Non-adhesive area 220 Bag joint 230 Notch 240 Notch 300 Plow 400 nozzles 500 Clamper 600 Cutter 700 Electronic equipment

Claims

1. A method for manufacturing a bag body having a first joint portion in which a first nonwoven fabric and a second nonwoven fabric, each having the same predetermined width in the lateral direction, are overlapped and at least the left and right side end portions are joined with an adhesive, the first nonwoven fabric and the second nonwoven fabric are made of biodegradable nonwoven fabrics made from natural materials, an adhesive application step of applying the adhesive to the first joint portion between the first nonwoven fabric and the second nonwoven fabric; a nonwoven fabric overlapping step of overlapping the first nonwoven fabric coated with the adhesive and the second nonwoven fabric; a backing sheet sandwiching step of sandwiching the top and bottom of the overlapped first nonwoven fabric and the second nonwoven fabric between a first backing sheet and a second backing sheet; a pressure joining step of pressing the first joint portions of the first nonwoven fabric and the second nonwoven fabric sandwiched between the first mount and the second mount via the first mount and the second mount to join the first joint portions and form the bag body; Equipped with a non-adhering portion is provided in at least a portion of the first mount and the second mount facing the first joint portion, the non-adhering portion being coated with a non-adhering agent that prevents the first non-woven fabric and the second non-woven fabric from adhering to the first mount and the second mount even when the adhesive is applied thereto, and the size of the non-adhering portion is formed larger than the size of the first joint portion, the first and second backing sheets have slits or notches at opposing positions, and a bag removal step is provided in which the bag is removed from between the first and second backing sheets by gripping and pulling the bag at the slit or notch; a predetermined size cutting step in which the first backing sheet and the second backing sheet are continuously supplied in a strip shape, the first nonwoven fabric and the second nonwoven fabric are continuously supplied in a strip shape, the bag body is continuously formed, and the bag body is continuously formed by cutting the first backing sheet and the second backing sheet together to a predetermined size, the first and second backing sheets and the continuous bag body, which are continuous in a strip shape, are fixed at a second joint portion, which is partially bonded, and a second joint portion cutting step is provided in which the second joint portions of the first and second backing sheets and the bag body are cut to the predetermined size in the predetermined size cutting step, After the second joint is cut, the bag is removed in the bag removal step. A method for manufacturing a bag body, comprising:

2. The second joint cutting step and the bag body removing step are performed with a plurality of the bags stacked one on top of another.

2. The method for manufacturing the bag according to claim 1.

3. At least some of the adhesive application step, the nonwoven fabric overlapping step, the backing paper sandwiching step, the press joining step, and the predetermined size cutting step are performed by a roll collator.

2. The method for manufacturing the bag according to claim 1.

4. The adhesive used to bond the first bonding portion is a biodegradable adhesive made from natural materials.

4. The method for manufacturing the bag according to claim 1, wherein the bag is made of a polyethylene terephthalate.

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