Method for manufacturing continuous body and method for manufacturing bag body

Abstract

To ensure the quality of a continuous body or bag body that can be cut from a continuous body.SOLUTION: A continuous body manufacturing method of the invention in which a bag body in which two materials are pasted together is sequentially cut includes: a gluing step (step S10) in which an adhesive is applied to the materials; a pasting step (step S20) in which the materials are pasted together with adhesive; and a folding step (step S40) in which the bags are folded bellows-like one on top of the other to produce a continuous body. The adhesives require a predetermined period of time to cure, from a soft state in which relative misalignment between bonded materials is allowed before curing is completed, to a hard state in which relative misalignment between bonded materials is not allowed and curing is completed. In the folding step (step S40), a folding back at the turnup line is performed during a predetermined period of time when the adhesive bonding the materials together is in a soft state before it cures to a hard state.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a method for producing a continuous piece of bag bodies made of two laminated materials, which are then cut into pieces, and to the bag bodies produced by this method. [Background technology]

[0002] One known bag-making technique involves bonding two strip-like pieces of material together and producing a continuous piece of material from the bonded materials that can be cut into bags. For example, a technique has been proposed for producing a continuous body from which bag bodies are cut out in sequence by carrying out the following three steps (see Patent Document 1). Gluing process: The U-shaped areas that are glued together in the bag are arranged in a repeated pattern. The process of applying adhesive to materials using a roller - Bonding process: The two materials are bonded together with the adhesive applied in the gluing process to form a continuous bag. The process of manufacturing semi-finished products lined up Folding process: The bags are stacked one by one and then folded over the adhesive coated areas. The semi-finished product is folded like fanfold paper at the overlapping fold lines. The process of manufacturing the continuum [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-7154 Summary of the Invention [Problem to be solved by the invention]

[0004] In the folded continuum as described above, as shown in Fig. 10, the inner material 1' of the two materials 1', 2' is folded back at a fold line 50' where the outer material 2' is folded back at a mountain fold while the inner material 1' is folded back at a valley fold. Therefore, the minimum dimension required for folding back at the fold line 50' of the inner material 1' is shorter than that of the outer material 2'. Despite such dimensional differences, the relative positions of the materials 1', 2' are fixed by adhesive, so that the inner material 1' may get stuck and cause wrinkles or twists in the continuum. Therefore, there is room for improvement in ensuring the quality of the continuous body and the bags cut from the continuous body.

[0005] The present invention was invented in consideration of the above problems, and one of its objectives is to ensure the quality of the continuous body and the bags cut from the continuous body. However, other objectives of the present invention are to provide actions and effects derived from the configurations shown in the "Mode for Carrying Out the Invention" described later, which are not obtainable by conventional techniques. [Means for solving the problem]

[0006] The continuous body manufacturing method disclosed here is a continuous body manufacturing method for manufacturing a continuous body in which bag bodies each having two materials bonded together are cut out in sequence. This continuous body manufacturing method includes a gluing step of applying adhesive to at least one of the materials extending in a strip shape in a pattern in which the areas to be bonded in the bag body are repeated along the strip length direction of the materials extending in a strip shape, a bonding step of bonding the materials together with the adhesive after the gluing step to manufacture a semi-finished product in which the bag bodies are continuously lined up along the strip length direction, and a folding step of folding the semi-finished product in an accordion-like manner so that the bag bodies are stacked one by one and a first folding step of folding one of the materials in a valley fold and the other in a mountain fold and a second folding step of folding one of the materials in a mountain fold and the other in a valley fold are alternately repeated along a folding line at least partially overlapping the areas coated with the adhesive, thereby manufacturing the continuous body by folding the semi-finished product in an accordion-like manner so that the bag bodies are stacked one by one. The adhesive requires a predetermined period of time to harden from a soft state in which the materials bonded together by the adhesive are allowed to shift relative to each other before the adhesive is completely hardened, to a hard state in which the adhesive is completely hardened and the materials bonded together by the adhesive are not allowed to shift relative to each other. The folding step involves folding the materials along the fold lines during the predetermined period in which the adhesive bonding the materials together is in the soft state before the adhesive is hardened to the hard state.

[0007] The bag body disclosed here is a bag body in which the continuous body manufactured by the above-mentioned continuous body manufacturing method is cut at the fold line, and a first edge cut at the fold line on one side of the material and a second edge cut at the fold line on the other side of the material are offset by a length corresponding to the difference between the minimum dimensions required for folding at the fold line on each of the one side and the other side of the material. Effect of the Invention

[0008] According to the present invention, the quality of the continuous body and the bags cut from the continuous body can be ensured. [Brief description of the drawings]

[0009] [Figure 1] 1 is an overall configuration diagram showing a schematic diagram of a continuous body manufacturing apparatus for carrying out a continuous body manufacturing method. [Diagram 2] FIG. 2 is a perspective view showing a schematic view of a main part of a gluing part. [Diagram 3] 1 is a flowchart illustrating a continuum manufacturing method. [Figure 4] FIG. 2 is a schematic diagram illustrating the mechanism by which wrinkles and kinks in materials are eliminated. [Diagram 5] FIG. 2 is a cross-sectional view showing a main portion of a bag body cut out from a continuous body. [Figure 6] FIG. 11 is a plan view showing a first modified example of an area where adhesive is applied. [Figure 7] FIG. 11 is a plan view showing a second modified example of an area coated with adhesive. [Figure 8] FIG. 13 is a plan view showing a third modified example of an area coated with adhesive. [Figure 9] FIG. 11 is a plan view showing a fourth modified example of an area where adhesive is applied. [Figure 10] FIG. 1 is a schematic diagram illustrating a problem that causes wrinkles and kinks in materials. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment for carrying out the continuous body manufacturing method will be described. The continuous body manufacturing method of this embodiment is a method for manufacturing a continuous body. The continuous body to be manufactured by this method is a state in which a plurality of bags are continuously connected, and the bags are folded back so that they are overlapped one by one. The continuous body folded in this state can be cut out one by one at the fold lines, and in the cut bag, two materials are bonded together.

[0011] The continuous body manufacturing method for manufacturing a continuous body in which the bags each having two bonded materials bonded thereto are successively cut out as described above is carried out in a continuous body manufacturing apparatus for manufacturing the continuous body. In this embodiment, an example is given in which the bag cut from the continuum has a rectangular shape in a front view. This bag has U-shaped regions along three of the four sides constituting the rectangular outline, and an opening is provided along the remaining side.

[0012] In the description of this embodiment, the direction in which the manufacturing process of the continuum progresses from upstream to downstream is defined as the MD direction (Machine Direction), and the direction perpendicular to the MD direction in a plane along the MD direction is defined as the CD direction (Cross Direction). The direction perpendicular to both the MD direction and the CD direction is defined as the TD direction (Transverse Direction). The MD direction is the so-called "flow direction", the CD direction is the so-called "width direction", and the TD direction is the so-called "thickness direction".

[0013] I. One embodiment In the following embodiment, a configuration relating to a continuous body manufacturing method will be described in item [1]. Then, the action and effect of the configuration of item [1] will be described in item [2]. [1. Configuration] In this section [1], a continuous body manufacturing apparatus for carrying out the continuous body manufacturing method is explained in subsection [1-1], and then the continuous body manufacturing method is explained in subsection [1-2].

[0014] [1-1. Equipment] As shown in FIG. 1, the continuous body manufacturing apparatus is an apparatus for bonding two strip-like extending materials 1, 2 together with an adhesive 3 to manufacture a continuous body 5 in which a bag body 4 (only two parts are marked with reference numerals in FIG. 1) is continuously connected. This manufacturing apparatus is provided with the following four parts 10, 20, 30, and 40. Gluing part 10: This part applies adhesive 3 to materials 1 and 2. - Bonding part 20: Bonding materials 1 and 2 together with adhesive 3 Cutting part 30: A part that makes a cut 9 in the bonded materials 1 and 2 Folding part 40: A part that folds materials 1 and 2 with slits 9.

[0015] These four parts 10, 20, 30, 40 are arranged in series along the MD direction. Specifically, the laminating part 20 is provided downstream of the gluing part 10 to which the materials 1 and 2 are fed. The cutting part 30 is provided downstream of the laminating part 20, and the folding part 40 is provided downstream of the cutting part 30. In this embodiment, a paper material (base paper) is exemplified as the materials 1 and 2 fed to the gluing part 10. However, the materials 1 and 2 are not limited to being made of paper, and various materials can be used as long as they have physical properties that allow them to be bonded together with the adhesive 3 and to be folded back.

[0016] The adhesive 3 used for coating in the gluing part 10 and for lamination in the laminating part 20 is of a type that requires a certain period of time to harden from the soft state described below to the hard state described below. Soft state: The material bonded with adhesive 3 before the adhesive 3 has completely hardened. A state in which the relative deviation between 1 and 2 is permitted Hard state: The relative displacement between materials 1 and 2 bonded together by adhesive 3 The adhesive 3 has cured completely without being allowed to cure.

[0017] The adhesive 3 of this embodiment is in a soft state when it is applied in the gluing part 10 or when the materials 1, 2 are attached to each other in the bonding part 20, and also maintains its soft state when the slits 9 are made in the cutting part 30 or when it is folded in the folding part 40. That is, an adhesive 3 is selected that has a predetermined hardening period that is longer than the time (period) required for the manufacturing process from the gluing part 10 to the folding part 40 to progress. Such an adhesive 3 can be said to be a slow-hardening adhesive, rather than a type of adhesive with a short hardening period such as a so-called instant adhesive or a fast-hardening type.

[0018] <Gluing part> The two materials 1, 2 fed to the gluing part 10 each extend in a strip shape. Of the materials 1, 2, the first material 1 corresponds to, for example, a half portion of the bag body 4 that forms the front side, and the other, the second material 2 corresponds to, for example, a half portion of the bag body 4 that forms the back side. In the gluing part 10, the adhesive 3 is applied to at least one of the materials 1 and 2. The surface to which the adhesive 3 is applied is the surface (front surface) of the materials 1 and 2 that face each other, and is the so-called back surface of the bag body 4 that is not exposed to the outside. Here, the gluing part 10 in which the adhesive 3 is applied only to the first material 1 is exemplified. However, the adhesive 3 may be applied only to the second material 2, or the adhesive 3 may be applied to both the materials 1 and 2.

[0019] The coated area 6 (shown by dots in FIG. 2) of the adhesive 3 on the first material 1 is the surface facing the second material 2, and the areas to be bonded in the bag body 4 are set in a repeated pattern along the MD direction (the direction of the length of the material extending in a strip shape). This coated area 6 includes areas that are continuous along the MD direction. As a specific example of the coated region 6, as shown in FIG. 2, there is a first pattern region 6A in which U-shaped unit regions 60 are repeated.

[0020] In the first pattern region 6A, unit regions 60, each having an open side facing one side in the CD direction (the lower side in FIG. 2), are repeated along the MD direction. If the U-shape of the unit region 60 is divided into three regions 61, 62, and 63 as described below, the horizontal regions 61 and 62 extend along the CD direction and are alternately provided along the MD direction, and the vertical region 63 extends along the MD direction. First horizontal region 61: A region corresponding to the upper horizontal side of the two horizontal sides of the U-shape Second horizontal region 62: A region corresponding to the lower horizontal side of the two horizontal sides of the U-shape Vertical area 63: Area corresponding to the vertical side of the U-shape

[0021] The lateral regions 61, 62 illustrated here are set to be slightly smaller than the dimension in the CD direction of the first material 1, and are set to be equal or approximately equal to the dimension in the CD direction of the second material 2 (see FIG. 1). In other words, the first material 1 is used which is wider than the second material 2. Also, the end portions T1, T2 on one side in the CD direction of the lateral regions 61, 62 are spaced apart from the edge 11 on one side in the CD direction of the first material 1.

[0022] These lateral regions 61, 62 are disposed at a distance from each other. Specifically, the downstream lateral region in one unit region 60 of interest (the second lateral region 62 in FIG. 2) is disposed at a gap 69 between itself and the upstream lateral region in the unit region 60 adjacent to the downstream side of the one unit region 60 of interest (the first lateral region 61 in FIG. 2). In addition, in one unit area 60, the upstream horizontal area (first horizontal area 61 in Figure 2) is spaced apart from the downstream horizontal area (second horizontal area 62 in Figure 2) in the MD direction, as they correspond to the horizontal sides of the U-shape as described above.

[0023] The vertical region 63 illustrated here includes the edge 12 on the other side (upper side in FIG. 2) of the first material 1 in the CD direction. The vertical region 63 of one unit region 60 in question is connected to the vertical regions 63 of the unit regions 60 adjacent to the upstream and downstream sides of the one unit region 60 in question. Since the gap 69 is provided as described above, this vertical region 63 can be said to be a region that extends slightly in the MD direction relative to the horizontal regions 61, 62. The vertical region 63 thus set is continuous along the MD direction. Therefore, on the other side of the gap 69 in the CD direction, the vertical region 63 extends along the MD direction.

[0024] <Laminating part> As shown in FIG. 1, the bonding part 20 bonds materials 1 and 2 together with an adhesive 3 applied in the gluing part 10 to produce a semi-finished product 5' in which bags 4 are continuously arranged along the MD direction. The "semi-finished product 5'" referred to here is a semi-finished product of the continuum 5. The continuum 5 is folded and configured in layers, whereas the semi-finished product 5' is not folded and configured in a planar shape along the MD direction.

[0025] In this bonding part 20, the materials 1 and 2 are bonded together such that the other edge 12 (see FIG. 2) of the first material 1 in the CD direction and the other edge of the second material 2 in the CD direction coincide with each other when viewed in the TD direction. Since the first material 1 is wider than the second material 2, one edge 11 (see FIG. 2) in the CD direction of the first material 1 is located to one side in the CD direction of the one edge in the CD direction of the second material 2. The area of ​​the first material 1 extending to one side in the CD direction from the one edge in the CD direction of the second material 2 becomes a flap (also called a "flap" or "lid") in each bag 4 that can swing freely and open and close the opening.

[0026] <Cutting part> The cut-out part 30 is a part that provides discontinuous cuts (hereinafter referred to as "perforations" and shown by two-dot chain lines in Fig. 2) 9 in the materials 1 and 2 along the CD direction (direction intersecting with the MD direction) at the boundaries between the bag bodies 4 in the semi-finished product 5'. The perforations 9 provided by the cut-out part 30 extend across the above-mentioned gaps 69 and the vertical regions 63 over the entire CD direction of the semi-finished product 5'. However, the perforations 9 may be cut only in the gaps 69 (the perforations 9 may not be cut in the vertical regions 63).

[0027] <Folding part> The folding part 40 is a part that alternately repeats the first fold and the second fold described below at a fold line 50 that straddles the above-mentioned coating area 6 (see Figure 2) (at least partially overlaps the coating area 6) and produces a continuous body 5 by folding the semi-finished product 5' in an accordion-like shape with the bag bodies 4 stacked one on top of the other. First fold: The first material 1 is folded in a valley and the second material 2 is folded in a mountain. - Second fold: Fold the first material 1 in half and fold the second material 2 in half Note that a "valley fold" means folding so that the crease is on the inside, and a "mountain fold" means folding so that the crease is on the outside.

[0028] The folding line 50 along which the folding in the folding part 40 is performed is a fold including two types of folds, a first folding line 51 along which the above-mentioned first folding is performed and a second folding line 52 along which the above-mentioned second folding is performed. In the folding part 40, the semi-finished product 5' is alternately folded at the first folding line 51 and folded at the second folding line 52. In this manner, the continuous body 5 in which the semi-finished product 5' is folded like fanfold paper is manufactured.

[0029] The folding line 50 illustrated here crosses the vertical region 63 (see FIG. 2) of the first pattern region 6A and is a fold line on the perforation 9. That is, the fold line that crosses the gap 69 and the vertical region 63 and extends over the entire area in the CD direction is the folding line 50. In this manner, the semi-finished product 5' is folded in an accordion-like shape at the folding line 50 on the perforation 9 provided by the cut part 30. As described above, since the fold line 50 crosses the gap 69 where no adhesive 3 is applied, it can be said that the glued part 10 does not apply adhesive 3 to a portion (i.e., the area of ​​the gap 69) of the area that is to become the fold line 50 that is folded back in the folding part 40. It can also be said that the glued part 10 applies adhesive 3 only to a portion of the area that is to become the perforation 9 that crosses the vertical area 63 (the other portion excluding a portion of the area that is to become the fold line 50).

[0030] In the folding part 40 of this embodiment, the semi-finished product 5' is folded back before the adhesive 3 that bonds the materials 1 and 2 together hardens to the above-mentioned hard state. That is, in the folding part 40, the semi-finished product 5' is folded back at the folding line 50 during a predetermined period in which the adhesive 3 is in the above-mentioned soft state.

[0031] [1-2. Method] Next, a continuous body manufacturing method carried out by the continuous body manufacturing apparatus will be described with reference to the flow chart of FIG. In this manufacturing method, the above-mentioned parts 10, 20, 30, and 40, which are components of the continuous body manufacturing apparatus, carry out processes in which the word "part" in the name is replaced with "process." In detail, the gluing part 10 carries out a gluing process, the laminating part 20 carries out a laminating process, the cutting part 30 carries out a cutting process, and the folding part 40 carries out a folding process.

[0032] First, a gluing process is carried out on the first material 1 (at least one of materials 1 and 2) in which adhesive 3 is applied in a pattern in which the areas to be bonded in the bag body 4 are repeated along the MD direction (step S10). In this gluing process, adhesive 3 is not applied to some of the areas that will become the fold lines 50 that will be folded back in the folding process and the perforations 9 that will be cut in the cutting process. After the gluing process in which adhesive 3 is applied to the coating areas 6 set in the above pattern, a bonding process is carried out in which the materials 1, 2 are bonded together with the adhesive 3 to produce a semi-finished product 5' in which bag bodies 4 are continuously lined up along the MD direction (step S20).

[0033] After the laminating step (before the folding step), a cutting step is carried out to provide perforations 9 in the materials 1, 2 along the CD direction at the boundaries between the bag bodies 4 in the semi-finished product 5' (step S30). After the cutting step (after the bonding step), a folding step is carried out (step S40) in which the above-mentioned first fold and the above-mentioned second fold are alternately repeated at a fold line 50 across the application area 6 of the adhesive 3, and the semi-finished product 5' is folded in an accordion-like manner with the bags 4 overlapping one by one to manufacture the continuous body 5. In this folding step, the semi-finished product 5' is folded in an accordion-like manner at the fold line 50 on the perforation 9 provided in the cutting step. Furthermore, in this folding step, folding at the fold line 50 is carried out during the above-mentioned predetermined period when the adhesive 3 bonding the materials 1 and 2 together is in a soft state before hardening to a hard state.

[0034] [2. Actions and Effects] Since the continuous body manufacturing method of the present embodiment is configured as described above, it is possible to obtain the following actions and effects. (1) In the folding step of the present continuous body manufacturing method, the semi-finished product 5' is folded back at the fold line 50 during a predetermined period when the adhesive 3 that bonds the materials 1 and 2 together is in a soft state before it hardens to a hard state. This folding step of folding back the semi-finished product 5' at the fold line 50 before the adhesive 3 hardens is premised on the fact that the materials 1 and 2 have different dimensions (i.e., there is a circumference difference) that are minimum necessary for folding back at the fold line 50. In addition, this folding step is configured to fold back the semi-finished product 5' at the fold line 50 during a predetermined period, based on the fact that if the materials 1 and 2 are bonded together by the adhesive 3 in a hard state, no relative misalignment is permitted, which leads to the occurrence of wrinkles and twists.

[0035] As illustrated in Fig. 4, the minimum dimension required for folding at the first fold line 51 is shorter for the inner first material 1 than for the outer second material 2. In addition, because the adhesive 3 that bonds the materials 1 and 2 together is in a soft state, the inner first material 1 is allowed to shift relative to the outer second material 2, and the inner first material 1 naturally shifts relative to the outer second material 2 as if smoothing out the wrinkles and kinks (the shift is illustrated by a wavy arrow in Fig. 4).

[0036] On the other hand, the minimum dimension required for folding at the second fold line 52 is longer for the outer first material 1 than for the inner second material 2. Furthermore, because the adhesive 3 that bonds the materials 1 and 2 together is in a soft state, the inner second material 2 is allowed to shift relative to the outer first material 1, and the inner second material 2 naturally shifts relative to the outer first material 1 as if smoothing out wrinkles and kinks.

[0037] The shift of the first material 1 on the inside of the first fold line 51 is offset at the second fold line 52 adjacent to the first fold line 51 where the shift occurred. Similarly, the shift of the second material 2 on the inside of the second fold line 52 is offset at the first fold line 51 adjacent to the second fold line 52 where the shift occurred. The offset at the fold lines 51, 52 prevents the shifts of the materials 1, 2 from accumulating, and prevents wrinkles and twists from occurring in the continuum 5. Therefore, the quality of the continuous body 5 and the bag bodies 4 cut from the continuous body 5 can be ensured.

[0038] (2) Because the materials 1 and 2 are misaligned at the fold line 50 due to the above-mentioned mechanism of action, in each bag 4 cut from the continuous body 5 manufactured by the continuous body manufacturing apparatus of this embodiment, one of the end edges 41 and 42 of the materials 1 and 2 extends further than the other, as shown in Fig. 5. In detail, the first end edge 41 cut at the fold line 50 on the perforation 9 in the first material 1 and the second end edge 42 cut at the fold line 50 on the perforation 9 in the second material 2 are misaligned by a length corresponding to the difference between the minimum dimensions required for folding at the fold line 50 in each of the materials 1 and 2. In this way, the bag 4 whose end face at the perforation 9 is not flush is prevented from wrinkling or twisting, ensuring quality.

[0039] (3) Since the semi-finished product 5' is folded in an accordion-like shape at the fold lines 50 on the perforations 9 provided in the materials 1 and 2 along the CD direction at the boundaries between the bags 4 in the semi-finished product 5', the semi-finished product 5' can be smoothly folded at the fold lines 50. Since the continuous body 5 can be smoothly folded in this manner, the quality of the continuous body 5 can be improved. The quality of the bags 4 cut out from the continuous body 5 can also be improved.

[0040] (4) In the gluing process, the adhesive 3 is not applied to a portion of the area that is to become the fold line 50 in the folding process, so that the portion of the fold line 50 that is not applied with the adhesive 3 allows the materials 1 and 2 to shift relative to each other without being restricted by the adhesive 3. This contributes to preventing wrinkles and twists in the continuum 5, and contributes to improving the quality of the continuum 5 and the bag 4. Since the fold-back line 50 is located on the perforation 9 that will be cut in the cutting process, the adhesive 3 is not applied to a part of the area that will become the perforation 9. This makes it possible to prevent the adhesive 3 from spilling out through the perforation 9. This also makes it possible to improve the quality of the continuous body 5 and the bag bodies 4 cut from the continuous body 5.

[0041] (5) In addition, the use of paper materials 1 and 2 can promote the so-called "plastic-free" approach compared to the use of materials made of resin films, thereby contributing to the reduction of environmental load. The continuous body manufacturing apparatus can provide the same functions and effects as the continuous body manufacturing method.

[0042] [II. Modifications] The above-described embodiment is merely an example, and is not intended to exclude various modifications and application of techniques not explicitly stated in the embodiment. Each configuration of the present embodiment can be modified in various ways without departing from the spirit of the embodiment. In addition, the configurations can be selected as necessary, and can be combined appropriately.

[0043] For example, the area where the adhesive is applied to the material in the gluing step is not limited to the first pattern area 6A described above, and various areas may be used. A first modified example of the coating region 6 is a second pattern region 6B as shown in Fig. 6. The second pattern region 6B is different from the above-mentioned first pattern region 6A (see Fig. 2) in that the lateral regions 61, 62 of the first pattern region 6A are extended to extend over the entire region in the CD direction, but the other configurations are the same. That is, the lateral regions 61', 62' extending over the entire region in the CD direction and a vertical region 63' similar to the vertical region 63 of the first pattern region 6A are set as a unit region 60', and a second pattern region 6B in which the unit regions 60' are repeated may be adopted.

[0044] A second modified example of the coating region 6 is a third pattern region 6C as shown in Fig. 7. The third pattern region 6C is a pattern symmetrical in the CD direction (band width direction). In detail, unit regions 60'' with the open side of the U-shape facing one side in the MD direction (the upstream side in Fig. 7) are repeated along the MD direction. In this unit region 60'', horizontal regions 61'' and 62'' extend along the MD direction, and a vertical region 63'' extends along the CD direction.

[0045] When the third pattern region 6C is adopted, the adhesive is applied in a pattern symmetrical in the CD direction (strip width direction) in the gluing part or gluing process. By applying the adhesive in such a balanced manner, it is possible to suppress the difference in thickness between one side and the other side of the continuous body in the CD direction, which contributes to improving the quality of the continuous body and the bag body. The area where the adhesive is applied to the material by the gluing process may be a fourth pattern area 6D (see FIG. 8) where the gaps 69 of the first pattern area 6A are also coated with adhesive, or a fifth pattern area 6E (see FIG. 9) where the gaps 69' of the second pattern area 6B are also coated with adhesive. In these cases where adhesive is applied to most or all of the areas that are to become perforations (shown by two-dot chain lines in FIGS. 8 and 9), the material is folded back at a folding line that overlaps most or all of the area where the adhesive is applied. When the areas 6D and 6E where the adhesive is applied to the gaps 69 and 69' are used as described above, the maintenance and adjustment work of the glued part (the part where the gluing process is performed) can be reduced by simply setting the application area.

[0046] The cutting process (cutting part) may be performed at least before the folding process (arranged upstream of the folding part). On the other hand, the cutting process may be omitted. If the cutting process is omitted, the continuous body can be manufactured with a simple process (apparatus configuration). In addition, when an adhesive that hardens as the solvent evaporates can be used, the period during which it transitions from a soft state to a hard state (i.e., the specified period) can be adjusted by adjusting the degree of solvent evaporation.

[0047] An example of a case where an adhesive that hardens to the extent that the water-based solvent evaporates (volatilizes) is used is when a paper material laminated with a resin film is used as the first material and an unlaminated paper material is used as the second material. When these materials are used, the unlaminated second material ensures the evaporation of the water-based solvent, and the laminated first material suppresses the evaporation of the water-based solvent, so that the specified period can be extended while preventing the adhesive from remaining unhardened. In other words, the length of the specified period can be adjusted by selecting the material.

[0048] Finally, specific examples of materials and adhesives that can be used in the present continuous body manufacturing method are listed below. The material is preferably a commonly used paper whose main component is plant-derived pulp, and more preferably a paper whose main component is wood pulp.Specific examples include bleached kraft paper, unbleached kraft paper, fine paper, paperboard, liner paper, coated paper, one-sided glazed paper, glassine paper, graphene paper, etc., and among these, it is preferable to use bleached kraft paper and unbleached kraft paper as the material. Examples of adhesives include acrylic, urethane, epoxy, vinyl acetate, rubber, vinyl, etc. Among these, it is preferable to use an ethylene-vinyl acetate adhesive. [Explanation of symbols]

[0049] 1. First Materials (Materials) 10 Gluing part 11 Edge on one side in CD direction 12 The other edge in the CD direction 2. Secondary materials (materials) 20 Lamination part 3. Glue 30 Cutting part 4 Bag body 40 Folding Part 41 First edge 42 Second edge 5. Continuum 5′ Semi-finished product 50 return line 51 First turning line 52 Second turn line 6 Coating area 6A First Pattern Area 6B Second pattern area 6C Third pattern area 60 Unit Area 61 First horizontal area 62 Second horizontal area 63 Vertical Region 69 Gap 9 Perforations (intermittent cuts) T1 end T2 end

Claims

1. A continuous body manufacturing method for manufacturing a continuous body in which a bag body having two materials bonded together is successively cut, comprising the steps of: a gluing step of applying adhesive to at least one of the materials extending in a strip shape in a pattern in which the areas to be bonded in the bag body are repeated along the strip length direction of the material extending in a strip shape; a bonding process for bonding the materials together with the adhesive after the gluing process to produce a semi-finished product in which the bag bodies are continuously arranged along the strip length direction; a folding process in which, after the laminating process, a first fold in which one of the materials is folded in a valley manner and the other of the materials is folded in a mountain manner and a second fold in which one of the materials is folded in a mountain manner and the other of the materials is folded in a valley manner are alternately repeated along a fold line at least partially overlapping the area coated with the adhesive, thereby folding the semi-finished product in an accordion-like manner so that the bags are stacked one on top of the other, thereby manufacturing the continuous body; a cutting step, which is performed after the laminating step and before the folding step, of making intermittent cuts in the material along a strip width direction intersecting with the strip length direction at the boundaries between the bag bodies in the semi-finished product, the adhesive requires a predetermined period of time to harden from a soft state in which relative misalignment between the materials bonded together by the adhesive is permitted before hardening of the adhesive is complete, to a hard state in which relative misalignment between the materials bonded together by the adhesive is not permitted and hardening of the adhesive is complete; The gluing step includes applying the adhesive only to a portion of the area that is to become the folding line in the folding step, without applying the adhesive to the portion, and applying the adhesive only to the remaining portion excluding the portion, The cutting step provides the cut only in the portion where the adhesive is not applied, The folding step folds the semi-finished product in an accordion-like shape at the folding lines on the intermittent slits provided in the cutting step, and performs folding at the folding lines during the predetermined period in which the adhesive bonding the materials together is in the soft state before hardening to the hard state. A method for manufacturing a continuous body.

2. The gluing step applies the adhesive in a pattern that is symmetrical in a strip width direction that intersects with the strip length direction.

2. The method for producing a continuous body according to claim 1 .

3. A method for producing a bag body in which the continuous body produced by the continuous body production method according to claim 1 or 2 is cut at the folding lines, comprising the steps of: The bag body is cut out from the continuous body in a state in which a first edge cut by the fold line on one side of the material and a second edge cut by the fold line on the other side of the material are offset by a length corresponding to a difference between the minimum dimensions required for folding at the fold line on each of the one side and the other side of the material. A method for manufacturing a bag body comprising the steps of:

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