Manufacturing method of packaging bag and manufacturing apparatus of packaging bag

Abstract

To provide a manufacturing method of a packaging bag and a manufacturing apparatus of a packaging bag capable of manufacturing a packaging bag with a center folded middle material film such as an inner lid sheet being arranged with good location accuracy.SOLUTION: A manufacturing method includes a center-folding process, using a center-folding mechanism 2 including an introduction part 21 for introducing a long belt-like middle material original sheet S3 and a center-folding part 22 for folding the middle material original sheet introduced from the introduction part, of center-folding in a manner that a pleat 93a is formed along a long direction, wherein the center-folding process is a process of sending the middle material original sheet by using the introduction part from one introduction area A1 of one side where a pleat is located in a width direction than a center folded part to the other introduction area A2 on the opposite side that is on the other side of the one side in the width direction than the center folded part, and introducing the middle material original sheet from the other introduction area to the center folded part.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a method and an apparatus for manufacturing a packaging bag. [Background technology]

[0002] A conventional packaging bag is described in Patent Document 1. The packaging bag includes a bag-shaped bag body and an inner lid sheet attached to the bag body. This type of packaging bag is manufactured by overlapping a folded second sheet between a third sheet and a fourth sheet and heat welding them.

[0003] However, it is difficult to properly position the second sheet between the third sheet and the fourth sheet, which can result in poor positioning accuracy of the inner lid sheet in the packaging bag. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-134649 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a method and an apparatus for manufacturing a packaging bag that can manufacture a packaging bag in which a half-folded inner material film such as an inner lid sheet can be positioned with high positional accuracy. [Means for solving the problem]

[0006] The method for manufacturing a packaging bag of the present invention is a method for manufacturing a packaging bag including a first surface film, a second surface film disposed opposite the first surface film, and a core film disposed in a half-folded state between the first surface film and the second surface film, the method including a half-folding step of folding a long strip-shaped core raw sheet that will become the core film in half so as to form a fold along the longitudinal direction of the long strip using a half-folding mechanism including an introduction section that introduces the core raw sheet and a half-folding section that folds the core raw sheet introduced from the introduction section; and a method for manufacturing a packaging bag including a long strip-shaped core raw sheet that will become the core film and a long strip-shaped second raw sheet that will become the second surface film disposed opposite the first raw sheet and folded in half in the half-folding step. The method includes a supplying process in which a core material sheet is supplied between the first and second raw sheets in the supplying process, with its longitudinal direction aligned with the longitudinal direction of the first raw sheet and the second raw sheet, and is supplied to a mid-width position of the first and second raw sheet; and a heat welding process in which the first raw sheet, the second raw sheet, and the core material sheet are heat-welded together, with the core material sheet being supplied between the first and second raw sheet in the supplying process.The half-folding process is a process in which the core material sheet is fed using the introduction section from one introduction area on one side where the fold is located in the width direction from the half-folding section to another introduction area on the other side opposite the one side in the width direction from the half-folding section, and the core material sheet is introduced from the other introduction area to the half-folding section.

[0007] According to this configuration, in the half-folding process, the core material raw sheet is fed from one introduction area to the other introduction area using the introduction section, and then introduced into the half-folding section, so the supplying process and the heat welding process can be performed with the core material raw sheet in a stable position in the width direction. Therefore, according to this manufacturing method, it is possible to manufacture packaging bags in which the core material film is positioned with high precision.

[0008] In addition, the introduction section comprises a first wrapping section arranged in one introduction area and a second wrapping section arranged in the other introduction area, and the first wrapping section and the second wrapping section are configured so that their positions can be adjusted relative to each other in at least one direction of the width direction and the length direction, and the half-folding process can also be a process of wrapping the core material raw sheet around the first wrapping section and the second wrapping section to introduce the core material raw sheet.

[0009] According to this configuration, the core material raw sheet is introduced by wrapping it around the first wrapping portion and the second wrapping portion, the positions of which can be adjusted relative to each other, so that the introduction position can be adjusted and the position of the core material raw sheet is stabilized.

[0010] Furthermore, the supplying process is a process of supplying the core material raw sheet with a guide portion interposed inside the core material raw sheet that has been folded in half in the folding process, and the heat welding process can also include a first heat welding process of heat welding the first raw material sheet and the core material raw sheet, and the second raw material sheet and the core material raw sheet with a guide portion interposed inside the core material raw sheet.

[0011] According to this configuration, the core raw sheet is supplied via the guide portion and heat-sealed, so that the core raw sheet can be appropriately positioned relative to the first raw sheet and the second raw sheet and heat-sealed.

[0012] In addition, the heat welding process may include a second heat welding process after the first heat welding process, in which the first raw sheet and the second raw sheet, and the inner surfaces of the half-folded core raw sheet are heat-welded together without the guide portion being interposed.

[0013] According to this configuration, the first raw sheet, the second raw sheet, and the core raw sheet can be appropriately heat-sealed.

[0014] The packaging bag manufacturing apparatus of the present invention is a packaging bag manufacturing apparatus for manufacturing packaging bags including a first side film, a second side film arranged opposite the first side film, and a core film arranged in a half-folded state between the first side film and the second side film, and is provided with an introduction section for introducing a long strip-shaped core raw sheet that will become the core film, and a half-folding section for folding the core raw sheet introduced from the introduction section, and a half-folding mechanism for folding the core raw sheet in half so that a fold is formed in the long strip-shaped core raw sheet, and a long strip-shaped first raw sheet that will become the first side film, and a long strip-shaped second raw sheet that will become the second side film arranged opposite the first raw sheet, and a folding mechanism for folding the core raw sheet in half so that a fold is formed in the long strip-shaped core ... between the long strip-shaped first raw sheet that will become the first side film, and a long strip-shaped second raw sheet that will become the second side film. The device is equipped with a supply mechanism that aligns the long direction of the raw material sheet with the long direction of the first raw material sheet and the second raw material sheet and supplies the raw material sheet to a midpoint in the width direction of the first raw material sheet and the second raw material sheet, and a heat welding mechanism that heat welds the first raw material sheet, the second raw material sheet, and the intermediate material sheet together when the intermediate material sheet is supplied between the first raw material sheet and the second raw material sheet by the supply mechanism, and the introduction section is configured to feed the intermediate material sheet from one introduction area on one side where the fold is located in the width direction from the half-fold section to another introduction area on the other side opposite the one side in the width direction from the half-fold section, and introduce the intermediate material sheet from the other introduction area to the half-fold section.

[0015] According to this configuration, the intermediate film can be fed from one introduction area to the other introduction area using the introduction section by the folding mechanism, and then introduced into the folding section, so that the intermediate film can be supplied and heat-sealed with its widthwise position stabilized. Therefore, this manufacturing device can manufacture packaging bags in which the intermediate film is positioned with high accuracy.

[0016] In addition, the introduction section is equipped with a first wrapping section that is arranged in the one introduction area and around which the core material raw sheet is wrapped, and a second wrapping section that is arranged in the other introduction area and around which the core material raw sheet sent from the one introduction area is wrapped, and the first wrapping section and the second wrapping section can be configured so that their positions relative to each other can be adjusted in at least one of the width direction and the length direction.

[0017] According to this configuration, the core material raw sheet is introduced by wrapping it around the first wrapping portion and the second wrapping portion, the positions of which can be adjusted relative to each other, so that the introduction position can be adjusted and the position of the core material raw sheet is stabilized.

[0018] In addition, the intermediate material raw sheet may be configured to include a guide portion that is positioned inside the intermediate material raw sheet folded in half by the folding mechanism and extends to the heat welding mechanism, and the heat welding mechanism may be configured to include a first heat welding portion that heat welds the first raw material sheet and the intermediate material raw sheet, and the second raw material sheet and the intermediate material raw sheet, with the guide portion interposed inside the intermediate material raw sheet.

[0019] According to this configuration, the core raw sheet is supplied via the guide portion and heat-sealed, so that the core raw sheet can be appropriately positioned relative to the first raw sheet and the second raw sheet and heat-sealed.

[0020] In addition, the heat welding mechanism may include a second heat welding portion that heat-welds the first raw sheet, the second raw sheet, and the inner surfaces of the half-folded core raw sheet together after heat welding at the first heat welding portion, and the guide portion may be configured so as not to extend to the second heat welding portion.

[0021] According to this configuration, the first raw sheet, the second raw sheet, and the core raw sheet can be appropriately heat-sealed. [Effects of the Invention]

[0022] According to the present invention, a method and an apparatus for manufacturing a packaging bag can be obtained that can manufacture a packaging bag in which a half-folded inner material film such as an inner lid sheet can be positioned with high positional accuracy. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is a plan view showing an outline of a packaging bag manufacturing apparatus according to an embodiment of the present invention. [Figure 2] FIG. 2 is a front view showing an outline of the manufacturing apparatus for the packaging bag. [Figure 3] 4 is a plan view showing a half-folding mechanism of the packaging bag manufacturing apparatus. FIG. [Figure 4] FIG. [Figure 5] 4 is a diagram showing a hole mechanism of the manufacturing apparatus for the packaging bag. FIG. [Figure 6] 10 is a diagram showing a first raw sheet, a second raw sheet, a core raw sheet, and a bottom raw sheet supplied to a supply mechanism of the packaging bag manufacturing device. FIG. [Figure 7] 10 is a diagram showing the first raw sheet, the second raw sheet, the inner raw sheet, and the bottom raw sheet heat-sealed to the first heat-sealing section of the packaging bag manufacturing device. FIG. [Figure 8] FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. 7. [Figure 9] 10 is a diagram showing the first raw sheet, the second raw sheet, the inner raw sheet, and the bottom raw sheet heat-sealed to the second heat-sealing section of the packaging bag manufacturing device. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0024] An apparatus 1 for manufacturing a packaging bag 9 and a method for manufacturing a packaging bag 9 according to one embodiment of the present invention will be described with reference to Figures 1 to 9. For convenience of explanation, the longitudinal direction, width direction, and thickness direction will be described based on the directions shown in Figure 1 or Figure 2. In other words, the longitudinal direction, width direction, and thickness direction will be described based on the orientation of each raw sheet after the supplying process.

[0025] First, the packaging bag 9 manufactured by the manufacturing device 1 for manufacturing the packaging bag 9 and the manufacturing method for the packaging bag 9 according to this embodiment will be described with reference to FIGS.

[0026] 9, the packaging bag 9 includes a first side film 91, a second side film 92 arranged on the back side of the first side film 91 in the thickness direction and overlapping the first side film 91, a bottom portion 94 arranged between the first side film 91 and the second side film 92 in the thickness direction and forming the bottom of the packaging bag 9, and an inner material film 93 arranged between the first side film 91 and the second side film 92 in the thickness direction. The first side film 91 and the second side film 92 are sheet-like and have approximately the same shape, with one end side in the width direction being the upper end side of the packaging bag 9 and the other end side in the width direction being the lower end side (bottom side) of the packaging bag 9.

[0027] The bottom 94 is a sheet member that is attached to the lower ends of the first surface film 91 and the second surface film 92 and is configured to be expandable in the thickness direction while attached. Specifically, the bottom 94 is formed by folding a single sheet member halfway, and is arranged so that one side of the fold is located on the front side and the other side is located on the back side. The bottom 94 also has notches 94a formed by cutting out portions in the width direction at both ends of the longitudinal direction. The portion of the bottom 94 that is located on the front side is attached to the back side of the first surface film 91, and the portion that is located on the back side is attached to the surface of the second surface film 92. In this embodiment, the fold of the bottom 94 is located on the upper side, and the bottom 94 is attached by heat welding to the first surface film 91 and the second surface film 92 below the fold.

[0028] As shown in FIGS. 7 and 8 , the first and second films 91 and 92 each include a base layer 95 that forms the outer surface of the bag body 97, and a welding layer 96 that is disposed on the inner surface of the base layer 95. The welding layer 96 is a layer that melts when heat is applied for thermal welding, and is made of, for example, polypropylene. The base layer 95 is a layer that does not melt when heat is applied for thermal welding, and is made of, for example, polyester. The bottom 94 includes a bottom welding layer (not shown) that faces the inner surfaces of the first and second films 91 and 92, and a bottom base layer (not shown) that is located on the opposite side of the bottom welding layer from the inner surfaces of the first and second films 91 and 92. The bottom welding layer is a layer that melts when heat is applied for thermal welding, and is made of, for example, polypropylene. The bottom base layer is a layer that does not melt when heat is applied for thermal welding, and is made of, for example, polyester.

[0029] As shown in Fig. 9, the first side film 91, the second side film 92, and the bottom 94 are welded to one another to form a bag main body 97 capable of containing contents. In the bag main body 97 of this embodiment, the bottom 94 forms a gusset. Specifically, in the bag main body 97 of this embodiment, both longitudinal end portions of the first side film 91 and the second side film 92, which are overlapped in the thickness direction, are heat-welded along the width direction to form the sides of the bag main body 97, and the first side film 91 and the bottom 94, and the second side film 92 and the bottom 94 are heat-welded along the longitudinal direction to form the bottom of the bag main body 97. In other words, the bag main body 97 is formed with vertical seal portions 98 located at both longitudinal ends and extending in the width direction, and a first horizontal seal portion 991 located at the bottom end and extending in the longitudinal direction. Here, a bottom portion 94 is interposed between the lower end portions of the first surface film 91 and the second surface film 92 in the thickness direction, and a notch portion 94a is formed in the bottom portion 94, so that the notch portion 94a allows the inner surface of the first surface film 91 and the inner surface of the second surface film 92 to come into contact with each other. Therefore, even if the bottom portion 94 is interposed at the lower end portion, the side portions of the bag main body 97 can be heat-sealed as a whole. Moreover, the bag main body 97 of this embodiment is configured so that the top is open.

[0030] As shown in Figures 7 to 9, the interlayer film 93 is a sheet that is attached to the inner surfaces of the first and second films 91 and 92 and is configured to be expandable in the thickness direction while attached. Specifically, the interlayer film 93 is formed by folding a single sheet in half, with one side of the fold 93a positioned on the front side and the other side positioned on the back side. The interlayer film 93 has an interlayer outer surface 931 positioned on the outside in the thickness direction when folded in half, and an interlayer inner surface 932 positioned on the inside in the thickness direction when folded in half. The interlayer film 93 has a fold 93a extending longitudinally and a through-hole 93b penetrating the thickness direction formed in the middle of the width direction. Specifically, the interlayer film 93 has a fold 93a formed in the center of the width direction, and a through-hole 93b formed in the center of the length direction so as to overlap with the fold 93a. The through-hole 93b is a hole through which the contents are inserted, and the peripheral portion of the through-hole 93b supports the contents. Furthermore, a pinhole 93c is formed in the inner material film 93, penetrating in the thickness direction. The pinhole 93c is, for example, a hole for venting air when inserting a storage section into the through-hole 93b. The inner material film 93 is disposed between the first surface film 91 and the second surface film 92 in the thickness direction and at a position midway in the width direction of the bag body 97, folded at a fold 93a. Specifically, the inner material film 93 is disposed so that the outer surface 931 of the inner material faces the inner surfaces of the first surface film 91 and the second surface film 92, and the inner surface 932 of the inner material faces each other. In the inner material film 93 of this embodiment, the fold 93a extends along the longitudinal direction of the bag body 97 and is disposed so that the fold 93a faces upward in the vertical direction of the bag body 97.

[0031] As shown in Fig. 8, the filling film 93 includes a filling base layer 933 and filling welding layers 934 disposed on one and the other thickness-wise sides of the filling base layer 933. The filling welding layer 934 is a layer configured to melt when heat is applied for thermal welding, and is made of, for example, polypropylene. The filling base layer 933 is a layer that does not melt when heat is applied for thermal welding, and is made of, for example, polyester.

[0032] As shown in FIG. 8, at both longitudinal ends of the infill film 93, the first film 91 and the infill outer surface 931, and the second film 92 and the infill outer surface 931, are heat-sealed. At both longitudinal ends of the infill film 93, the infill inner surfaces 932 are also heat-sealed. As shown in FIG. 9, in this embodiment, the first film 91, the infill film 93, and the second film 92 are heat-sealed at positions that overlap with vertical seal portions 98 formed on the sides of the bag body 97. Also, as shown in FIG. 8, at the midpoint of the infill film 93 in the longitudinal direction, the first film 91 and the infill outer surface 931, and the second film 92 and the infill outer surface 931 are heat-sealed. At the midpoint of the infill film 93 in the longitudinal direction, the infill inner surfaces 932 are not heat-sealed. In other words, at the midpoint of the longitudinal direction, the infill inner surfaces 932 of the infill film 93 can move toward and away from each other in the thickness direction. As shown in Figure 9, a second horizontal seal portion 992 extending in the longitudinal direction is formed in the middle of the width direction of the bag body 97 by welding the first surface film 91 to the outer surface 931 of the inner material and the second surface film 92 to the outer surface 931 of the inner material.

[0033] Next, a description will be given of a manufacturing apparatus 1 for manufacturing the packaging bags 9. The manufacturing apparatus 1 for the packaging bags 9 manufactures the packaging bags 9 by stacking multiple long sheets while transporting them in the longitudinal direction and heat-sealing them in the thickness direction to manufacture the packaging bags 9. Specifically, the packaging bag 9 is manufactured by heat-sealing a first raw web sheet S1 that becomes the first surface film 91, a second raw web sheet S2 that becomes the second surface film 92 and is arranged to face each other in the thickness direction perpendicular to the longitudinal and width directions of the first raw web sheet S1, a bottom raw web sheet S4 that becomes the bottom 94 and is arranged between the first raw web sheet S1 and the second raw web sheet S2, and an inner material raw web sheet S3 that becomes the inner material film 93.

[0034] As shown in Figures 1 and 2, the manufacturing device 1 for packaging bags 9 includes a half-folding mechanism 2 that folds the core material raw sheet S3 and the bottom material raw sheet S4 in half, a hole-punching mechanism 11 that punches holes in the core material raw sheet S3 and the bottom material raw sheet S4, a supply mechanism 3 that supplies the first material raw sheet S1, the second material raw sheet S2, and the core material raw sheet S3 and the bottom material raw sheet S4 that have been folded in half by the half-folding mechanism 2 so that they are arranged in a predetermined thickness direction, a guide section 4 that guides the core material raw sheet S3 supplied by the supply mechanism 3 in the longitudinal direction, a heat-sealing mechanism 5 that heat-seals the first material raw sheet S1, the second material raw sheet S2, the core material raw sheet S3, and the bottom material raw sheet S4, and a cutting mechanism 12 that cuts the heat-sealed first material raw sheet S1, the second material raw sheet S2, the core material raw sheet S3, and the bottom material raw sheet S4 midway in the longitudinal direction. The manufacturing device 1 for the packaging bag 9 also includes a conveying mechanism that conveys the first raw sheet S1, the second raw sheet S2, the inner material raw sheet S3, and the bottom raw sheet S4 while applying tension in the longitudinal direction. The conveying mechanism includes, for example, a plurality of rollers, and is configured to convey the first raw sheet S1, the second raw sheet S2, the inner material raw sheet S3, and the bottom raw sheet S4 while applying tension by pulling them in the conveying direction with the plurality of rollers.

[0035] The first raw sheet S1, the second raw sheet S2, the inner material raw sheet S3, and the bottom raw sheet S4 are all long strip-shaped sheets. The first raw sheet S1, the second raw sheet S2, the inner material raw sheet S3, and the bottom raw sheet S4 are, for example, wound around the outer periphery of a core material and arranged in the manufacturing apparatus 1 for the packaging bag 9 with the sheets stacked in the radial direction of the core material.

[0036] The half-folding mechanism 2 folds the core raw sheet S3 and the bottom raw sheet S4 in half upstream in the conveying direction from the supply mechanism 3. As shown in Figures 3 and 4, the half-folding mechanism 2 includes a core half-folding mechanism 2A that folds the core raw sheet S3 in half, and a bottom half-folding mechanism (not shown) that folds the bottom raw sheet S4 in half. The core half-folding mechanism 2A and the bottom half-folding mechanism are arranged side by side in the width direction, and the bottom half-folding mechanism is arranged on the other side in the width direction (the side that will become the bottom of the packaging bag 9) of the core half-folding mechanism 2A.

[0037] The core material half-folding mechanism 2A includes an introduction section 21 that introduces the core material raw sheet S3, a half-folding section 22 that folds the core material raw sheet S3 introduced from the introduction section 21, and a fixing section 23 that fixes the introduction section 21 and the half-folding section 22. The core material half-folding mechanism 2A of this embodiment is configured to fold the core material raw sheet S3 in half by the tension applied when the core material raw sheet S3 is conveyed in the conveyance direction.

[0038] The fixing portion 23 is a rod-shaped body extending in the width direction, and is configured to be able to fix the introduction portion 21 and the half-folded portion 22 at a plurality of positions in the width direction. In the present embodiment, the fixing portion 23 is formed with a long hole 23a that extends in the width direction and penetrates in the thickness direction, and the introduction portion 21 and the half-folded portion 22 can be fixed at any position in the width direction within the range where the long hole 23a is formed. In addition, the fixing portion 23 is fixed to, for example, a base portion (not shown) of the manufacturing apparatus 1 for the packaging bag 9.

[0039] The introduction section 21 includes a first winding portion 211 and a second winding portion 212 around which the core raw sheet S3 is wound. The first winding portion 211 and the second winding portion 212 are spaced apart from each other in the width direction. Specifically, the first winding portion 211 is located on the other side of the second winding portion 212 in the width direction.

[0040] The first winding portion 211 includes a connecting portion 24 fixed to the fixing portion 23, and a winding roller 25 connected to the connecting portion 24 and around which the core raw sheet S3 is wound.

[0041] The connecting portion 24 is a plate-like body extending in a direction intersecting the thickness direction and the width direction. The connecting portion 24 includes a fixed connecting portion 241 connected to the fixed portion 23 and a winding connecting portion 242 connected to the winding roller 25. The connecting portion 24 in this embodiment is a plate-like body extending in the longitudinal direction, and is configured such that the fixed connecting portion 241 is located at one end side in the longitudinal direction (downstream side in the conveying direction) and the winding connecting portion 242 is located at the other end side in the longitudinal direction (upstream side in the conveying direction). The winding connecting portion 242 constitutes the other end side in the longitudinal direction of the connecting portion 24 and is a plate-like portion to which the winding roller 25 is connected. The winding roller 25 is fixed in an upright position to the winding connecting portion 242.

[0042] The fixed connecting part 241 is a plate-like body extending in the longitudinal direction that constitutes one longitudinal end of the connecting part 24. The fixed connecting part 241 has an elongated hole 24a formed therein that penetrates in the up-down direction and extends in a direction intersecting the up-down direction and the width direction. The fixed connecting part 241 of this embodiment has an elongated hole 24a formed therein that extends along the longitudinal direction. The fixed connecting part 241 is fixed with bolts and nuts by overlapping the elongated hole 24a formed in the fixed connecting part 241 with the elongated hole 23a formed in the fixed part 23.

[0043] The winding roller 25 comprises a cylindrical roller body 251 and a winding guide 252 arranged on the roller body 251. The roller body 251 has a circular outer circumferential surface and is arranged so that its axis coincides with the thickness direction. The winding guide 252 is an annular body provided so as to protrude radially outward from the roller body 251, and in this embodiment, is arranged at two locations spaced apart in the axial direction of the roller body 251.

[0044] The second winding portion 212 has the same configuration as the first winding portion 211. Therefore, a description of the specific configuration of the second winding portion 212 will be omitted and the same reference numerals will be used.

[0045] When the first winding portion 211 and the second winding portion 212 are fixed to the fixed portion 23, the winding rollers 25 of the first winding portion 211 and the second winding portion 212 are located on the other end side in the longitudinal direction (upstream side in the conveying direction) than the fixed portion 23.

[0046] The half-folded portion 22 includes a half-folded guide portion 26 that guides the core raw sheet S3 introduced from the introduction portion 21, a triangular plate portion 27 fixed to the half-folded guide portion 26, and a half-folded connecting portion 28 that connects the half-folded guide portion 26 and the fixing portion 23. The half-folded portion 22 is disposed between the first winding portion 211 and the second winding portion 212 in the width direction. In other words, the half-folded portion 22 is located on the other side of the first winding portion 211 and on one side of the second winding portion 212 in the width direction.

[0047] The half-folded connecting portion 28 is a rod-shaped body extending in a direction intersecting the thickness direction and the width direction. The half-folded connecting portion 28 has a long hole 28a formed therein that penetrates in the up-down direction and extends in a direction intersecting the up-down direction and the width direction. The long hole 28a formed in the half-folded connecting portion 28 of this embodiment extends along the longitudinal direction. The half-folded connecting portion 28 can be connected to the half-folded guiding portion 26. Specifically, the half-folded connecting portion 28 can be connected to the half-folded connecting portion 28 at any position within the range in which the long hole 28a is formed.

[0048] Half-folded guide portion 26 is a cylindrical body erected on half-folded connecting portion 28, and has a circular outer circumferential surface. Half-folded guide portion 26 is connected to half-folded connecting portion 28 at a position closer to one end in the longitudinal direction than the position at which half-folded connecting portion 28 is connected to fixed portion 23. Therefore, half-folded guide portion 26 is located closer to one end in the longitudinal direction than first winding portion 211 and second winding portion 212, which are located on the other end in the longitudinal direction relative to fixed portion 23. Half-folded connecting portion 28 and half-folded guide portion 26 are wrapped around core material raw sheet S3 introduced from introduction portion 21, and guide the wrapped core material raw sheet S3 to triangular plate portion 27.

[0049] As shown in FIG. 4, the triangular plate portion 27 is a triangular plate-like body. Specifically, the triangular plate portion 27 has a vertex portion 271 located at one end in the longitudinal direction (downstream portion in the conveying direction), a base portion 272 located at the other end in the longitudinal direction (upstream portion in the conveying direction), and a pair of oblique sides 273 extending from the end of the base portion 272 to the vertex portion 271. The triangular plate portion 27 also has a triangular surface 27a with which the core material raw sheet S3 comes into contact. The triangular plate portion 27 is arranged so that the triangular surface 27a extends in a direction intersecting the longitudinal direction and the width direction. The triangular plate portion 27 of this embodiment is an isosceles triangular plate-like body in which the pair of oblique sides 273 have approximately equal lengths. The triangular plate portion 27 is connected to one end in the longitudinal direction of the half-folding guide portion 26, and is configured so that the core material raw sheet S3 guided by the half-folding guide portion 26 can move in the longitudinal direction along the triangular surface 27a. That is, the core material raw sheet S3 moves along the triangular surface 27a from the bottom surface toward the apex 271. Then, the core material raw sheet S3 is folded in half at the midpoint in the width direction by the oblique side 273 and the apex 271. As the core material raw sheet S3 moves, folds 93a are continuously formed, and the core material raw sheet S3 has folds 93a that are continuous in the longitudinal direction.

[0050] In the core half-folding mechanism 2A configured as described above, the positions of the first and second winding portions 211 and 212 and the half-folded portion 22 relative to the fixed portion 23 extending in the width direction can be changed. Therefore, the relative positions of the first and second winding portions 211 and 212 and the half-folded portion 22 can be adjusted in the width direction. Furthermore, the first and second winding portions 211 and 212 can fix the fixed connecting portion 241 to the fixed portion 23 by changing the position in the longitudinal direction where the elongated hole 24a of the fixed connecting portion 241 overlaps with the elongated hole 23a of the fixed portion 23. Therefore, the relative positions of the first and second winding portions 211 and 212 can be adjusted in the conveying direction. Furthermore, the half-folded portion 22 can adjust the longitudinal positions of the half-folded guide portion 26 and the triangular plate portion 27 relative to the fixed portion 23 by changing the position in the longitudinal direction where the half-folded guide portion 26 is erected in the elongated hole 28a of the half-folded connecting portion 28.

[0051] The bottom half-folding mechanism is disposed on the other widthwise end side of the core half-folding mechanism 2A. The bottom half-folding mechanism is configured to fold the bottom raw sheet S4 so that the fold faces one widthwise end side. In other words, the bottom half-folding mechanism folds the bottom raw sheet S4 so that the fold of the bottom raw sheet S4 faces in the same direction as the fold 93a formed in the core raw sheet S3.

[0052] As shown in Figure 5, the hole mechanism 11 forms holes in the core material raw sheet S3 folded in half by the folding mechanism 2. Specifically, the hole mechanism 11 includes a pinhole forming unit 111 that forms pinholes 93c in the core material raw sheet S3, and a through hole forming unit 112 that forms through holes 93b. The pinhole forming unit 111 includes a needle unit 113 that opens the pinholes 93c in the core material raw sheet S3, and a needle drive unit 114 that moves the needle unit 113 toward and away from the core material raw sheet S3. The through hole forming unit 112 includes a hole punching unit 115 that forms through holes 93b in the core material raw sheet S3, and a hole drive unit 116 that moves the hole punching unit 115 toward and away from the core material raw sheet S3. The hole punching unit 115 cuts out one widthwise end of the half-folded core raw sheet S3 so as to include the fold 93a, thereby forming a through hole 93b that penetrates the core raw sheet S3 when unfolded. The hole mechanism 11 also includes a notch forming unit (not shown) that forms a notch 94a in the half-folded bottom raw sheet S4.

[0053] As shown in FIG. 2, the supply mechanism 3 supplies a first web sheet S1, a second web sheet S2, a core web sheet S3, and a bottom web sheet S4. Specifically, the supply mechanism 3 includes a first supply unit 31 that supplies the first web sheet S1, a second supply unit 32 that supplies the second web sheet S2, a core supply unit 33 that supplies the core web sheet S3, and a bottom supply unit 34 that supplies the bottom web sheet S4. In this embodiment, the first supply unit 31 supplies the first web sheet S1 from above, and the second supply unit 32 supplies the second web sheet S2 from below, so that the second web sheet S2 overlaps the first web sheet S1. The core supply unit 33 also supplies the core web sheet S3, which is folded in half between the first web sheet S1 and the second web sheet S2. The bottom supply unit 34 supplies the bottom raw sheet S4, which is folded in half at the other end in the width direction, between the first raw sheet S1 and the second raw sheet S2. The raw sheets supplied to the supply mechanism 3 are overlapped in the thickness direction so that their longitudinal directions coincide, as shown in FIG.

[0054] As shown in FIG. 1, the guide unit 4 is a plate-like body that guides the core material raw sheet S3 to a predetermined position in the width direction. Specifically, the guide unit 4 is located inside the folded core material raw sheet S3, and guides the fold 93a of the core material raw sheet S3 to a predetermined position halfway in the width direction, thereby guiding the core material raw sheet S3 to a predetermined position in the width direction. The guide unit 4 is a plate-like body that extends from one side of the supply mechanism 3 in the longitudinal direction to a portion halfway in the thermal welding mechanism 5. The guide unit 4 is also heat-resistant enough to withstand the heat of the thermal welding described below. In this embodiment, the guide unit 4 is made of metal.

[0055] 1 and 2, the heat-sealing mechanism 5 heat-seals the first raw sheet S1, the second raw sheet S2, the core raw sheet S3, and the bottom raw sheet S4 together when the core raw sheet S3 and the bottom raw sheet S4 are supplied between the first raw sheet S1 and the second raw sheet S2. The heat-sealing mechanism 5 includes a first heat-sealing unit 51 that heat-seals along the length direction (horizontal sealing) and a second heat-sealing unit 52 that heat-seals along the width direction (vertical sealing). The first heat-sealing unit 51 is located closer to the other end of the length direction (upstream in the conveying direction) than the second heat-sealing unit 52.

[0056] 1, the guide portion 4 is disposed so as to extend between the first heat-sealing portion 51 and the second heat-sealing portion 52. In other words, when the first heat-sealing portion 51 heat-seals the first raw sheet S1, the second raw sheet S2, and the core raw sheet S3 together, the guide portion 4 extends inside the half-folded core raw sheet S3, and when the second heat-sealing portion 52 heat-seals the first raw sheet S1, the second raw sheet S2, and the core raw sheet S3 together, the guide portion 4 does not extend inside the half-folded core raw sheet S3.

[0057] As shown in Figures 1 and 2, the first heat-sealing section 51 includes a first heat-sealing main body 511 that applies heat to heat-seal the first raw sheet S1, the second raw sheet S2, the inner raw sheet S3, and the bottom raw sheet S4, and a first cooling section 512 that cools the portion that has been heated by the first heat-sealing main body 511.

[0058] The first heat-sealing body 511 includes a heating portion extending longitudinally. The heating portions of the first heat-sealing body 511 are provided in pairs, spaced apart in the width direction. Specifically, the heating portions are positioned at widthwise positions for heat-sealing the inner material sheet S3 to the first and second web sheets S1 and S2, and at widthwise positions for heat-sealing the bottom web sheet S4 to the first and second web sheets S1 and S2. The first heat-sealing body 511 of this embodiment is configured to heat-seal the first and second web sheets S1, S2, the inner material sheet S3, and the bottom web sheet S4. Specifically, the welding layers 96 and the bottom welding layers of the first and second web sheets S1 and S2 are melted by heat to weld adjacent layers in the thickness direction. The welding layers 96 and the core welding layers 934 of the first and second raw sheets S1 and S2 are melted by heat to weld adjacent layers in the thickness direction. As shown in Fig. 8, the guide portion 4 extends inside the folded core sheet S3, so the core inner surfaces 932 of the core sheets S3 facing each other in the thickness direction are not heat-welded. Even when heat-welded by the first heat-welding portion 51, the core sheets S3 can move in a direction that separates the core inner surfaces 932.

[0059] 1 and 2, the first cooling section 512 is disposed closer to one end in the longitudinal direction (downstream in the conveying direction) than the first heat-sealing main body 511, and cools the portion heated by the first heat-sealing main body 511. The first cooling section 512, for example, brings a cooled metal plate into contact with the portion heated by the first heat-sealing main body 511, thereby cooling the portion heated by the first heat-sealing main body 511. In this embodiment, the guide section 4 extends to the first cooling section 512, and the core raw sheet S3 is cooled while being guided by the guide section 4. The cooling by the first cooling section 512 reliably solidifies the resin melted by the heat of the first heat-sealing main body 511, and adjacent layers are welded to each other.

[0060] In the first heat-sealing section 51 as described above, the core material raw sheet S3 is heat-sealed to the first raw sheet S1 and the second raw sheet S2 while the guide section 4 is extended. Therefore, heat-sealing can be performed while the position of the core material raw sheet S3 in the width direction relative to the first raw sheet S1 and the second raw sheet S2 is determined, so the position of the core material raw sheet S3 relative to the first raw sheet S1 and the second raw sheet S2 can be stabilized. When heat-sealing in the first heat-sealing section 51 is completed, the core material raw sheet S3 is heat-sealed to the first raw sheet S1 and the second raw sheet S2, so the core material raw sheet S3 does not shift in the width direction.

[0061] As shown in Figures 1 and 2, the second heat-sealing section 52 includes a second heat-sealing main body section 521 that applies heat to heat-seal the first raw sheet S1, the second raw sheet S2, the inner raw sheet S3, and the bottom raw sheet S4, and a second cooling section 522 that cools the portions that have been heated by the first heat-sealing main body section 511.

[0062] The second heat-sealing main body 521 includes a heating portion extending in the width direction. Specifically, the heating portion is positioned so as to heat-seal the end of the packaging bag 9 in the longitudinal direction (the position indicated by the two-dot chain line in FIGS. 6, 7, and 9) across the width. The second heat-sealing main body 521 of this embodiment is configured to heat-seal the first raw sheet S1, the second raw sheet S2, the inner material raw sheet S3, and the bottom raw sheet S4. Specifically, in the region in the width direction where the inner material raw sheet S3 and the bottom raw sheet S4 are not disposed, the welding layers 96 of the first raw sheet S1 and the second raw sheet S2 are melted by heat, thereby heat-sealing the inner surface of the first raw sheet S1 and the inner surface of the second raw sheet S2. Additionally, in the widthwise region where the bottom sheet S4 is located, the welding layers 96 and bottom welding layers of the first and second sheets S1 and S2 are thermally melted, thermally welding adjacent layers in the thickness direction. Because the guide portion 4 does not extend inside the folded core sheet S3, the welding layers 96 and core welding layers 934 of the first and second sheets S1 and S2, which face each other in the thickness direction, are thermally melted in the widthwise region where the core sheet S3 is located, thermally welding the inner surface of the first sheet S1 to the outer surface of the core sheet S3, the inner surface of the second sheet S2 to the outer surface of the core sheet S3, and the core inner surfaces 932 of the core sheets S3 to each other. In other words, the core inner surfaces 932 of the core sheets S3 are thermally welded to each other at the longitudinal end of the packaging bag 9.

[0063] The second cooling section 522 is disposed closer to one end in the longitudinal direction than the second thermal welding main body 521 (downstream in the conveying direction), and cools the portion heated by the second thermal welding main body 521. The second cooling section 522, for example, brings a cooled metal plate into contact with the portion heated by the first thermal welding main body 511, thereby cooling the portion heated by the second thermal welding main body 521. The cooling by the second cooling section 522 reliably solidifies the resin melted by the heat of the second thermal welding main body 521, and adjacent layers are welded to each other.

[0064] The cutting mechanism 12 cuts the heat-sealed first raw sheet S1, second raw sheet S2, inner material raw sheet S3, and bottom raw sheet S4 at intermediate positions in the longitudinal direction. Specifically, the cutting mechanism 12 cuts the intermediate portions heat-sealed by the second heat-sealing section 52 (positions indicated by two-dot chain lines in Figures 6, 7, and 9). As a result of cutting by the cutting mechanism 12, individual packaging bags 9 are formed from the respective raw sheets.

[0065] A method for manufacturing packaging bags 9 using the above-described manufacturing apparatus 1 for manufacturing packaging bags 9 will be described. First, as a preliminary step in the manufacturing process, the positions of introduction section 21 and half-folding section 22 in half-folding mechanism 2 in the width direction and length direction are adjusted.

[0066] The manufacturing method of the packaging bag 9 of this embodiment includes a half-folding step, a hole-punching step, a feeding step, a guiding step, a heat-sealing step including a first heat-sealing step and a second heat-sealing step, and a cutting step.

[0067] As shown in Figures 3 and 4, the half-folding process involves folding the core raw sheet S3 and the bottom raw sheet S4 in half at their widthwise intermediate portions. In this process, the core raw sheet S3 is introduced by the introduction section 21, and the core raw sheet S3 introduced from the introduction section 21 is folded in half by the half-folding section 22 so that a fold 93a is formed along the longitudinal direction. Specifically, in this process, the core raw sheet S3 is wrapped around a first wrapping section 211 located in a one-side introduction area A1, which is an area on one side of the half-folding section 22 in the width direction, and the wrapped core raw sheet S3 is sent to a second wrapping section 212 located in a other-side introduction area A2, which is an area on the other side of the half-folding section 22 in the width direction. The core raw sheet S3 is then wrapped around the second wrapping section 212, and the wrapped core raw sheet S3 is sent to the half-folding section 22 (specifically, the half-folding guide section 26). Then, the core material raw sheet S3 is folded in half at the half-folding section 22. Specifically, the core material raw sheet S3 is folded in half so that the fold 93a formed faces one side in the width direction. Also, in the half-folding process, the bottom material raw sheet S4 is folded in half at a mid-section in the width direction. In the half-folding process of this embodiment, the core material raw sheet S3 and the bottom material raw sheet S4 are folded in half so that the fold formed in the bottom material raw sheet S4 and the fold 93a formed in the core material raw sheet S3 face in the same direction.

[0068] 5, the hole punching process is a process of forming through holes 93b and pinholes 93c using the hole punching mechanism 11. Specifically, in the hole punching process, the through hole forming unit 112 forms the through hole 93b in the core raw sheet S3 that has been folded in half, and the pinhole forming unit 111 forms the pinhole 93c.

[0069] 2, the supplying step is a step of supplying the first raw sheet S1, the second raw sheet S2, the core raw sheet S3, and the bottom raw sheet S4 so that they overlap each other in the thickness direction. Specifically, in the supplying step, the second raw sheet S2 is supplied so as to overlap the underside of the first raw sheet S1, the core raw sheet S3 folded in half is supplied at a midpoint in the width direction between the first raw sheet S1 and the second raw sheet S2, and the bottom raw sheet S4 folded in half is supplied at the other end in the width direction between the first raw sheet S1 and the second raw sheet S2.

[0070] 1 and 8, the guide step is a step of guiding the core material raw sheet S3 to an appropriate position in the width direction. Specifically, in the guide step, a guide portion 4 extending in the longitudinal direction is placed inside the core material raw sheet S3 folded in half, and the core material raw sheet S3 is conveyed in the longitudinal direction along the guide portion 4, thereby guiding the core material raw sheet S3 to a position corresponding to the position where the guide portion 4 is placed. In this embodiment, the guide portion 4 abuts against the fold 93a portion of the core material raw sheet S3 from the inside, thereby guiding the core material raw sheet S3 to a position corresponding to one end of the guide portion 4 in the width direction. In addition, the guide process includes a step of pressing the first raw sheet S1, the second raw sheet S2, the core raw sheet S3 and the bottom raw sheet S4 in the thickness direction with the guide portion 4 positioned inside the half-folded core raw sheet S3, and adjusting the positions of the first raw sheet S1, the second raw sheet S2, the core raw sheet S3 and the bottom raw sheet S4 in the thickness direction.

[0071] 1, 2, 7, and 8, the first heat-sealing step is a step in which the first heat-sealing unit 51 heat-seals the first core sheet S1 to the core sheet S3 and the second core sheet S2 to the core sheet S3 with the guide unit 4 interposed inside the core sheet S3. In the first heat-sealing step, the first heat-sealing unit 51 heat-seals the first core sheet S1 to the bottom sheet S4 and the bottom sheet S4 to the second core sheet S2. In the first heat-sealing step, the core sheets are heat-sealed along the longitudinal direction. Specifically, the first heat-sealing body 511 heat-melts the welding layers 96 and bottom welding layers of the first and second web sheets S1 and S2, melting adjacent layers in the thickness direction and thermally welding the first and bottom web sheets S4 and the bottom and second web sheets S4 and S2. The first and second web sheets S1 and S2 heat-melts the welding layers 96 and the core welding layer 934, melting adjacent layers in the thickness direction and thermally welding the first and second web sheets S1 and S3 and the second and second web sheets S2 and S3. In this embodiment, the first cooling unit 512 cools the melted portions of the first heat-sealing body 511, solidifying the melted layers again and ensuring a reliable welding. In the first heat welding step, the inner surface 932 of the inner material raw sheet S3 facing each other in the thickness direction is not heat-welded. In this embodiment, since the guide portion 4 is interposed between the folded inner material raw sheet S3, the inner surface 932 of the inner material raw sheet S3 is not heat-welded to each other.

[0072] 1, 2, and 9, the second heat-sealing step is a step performed after the first heat-sealing step in which the second heat-sealing unit 52 heat-seals the inner surfaces of the half-folded first and second raw sheets S1 and S2, and the inner surfaces of the half-folded core sheet S3, without the guide unit 4. In the second heat-sealing step, the second heat-sealing unit 52 heat-seals the first and bottom raw sheets S1 and S4, and the second and bottom raw sheets S2 and S4. In the second heat-sealing step, each raw sheet is heat-sealed across the width at positions that will become the ends of the packaging bag 9 in the longitudinal direction (positions shown by two-dot chain lines in FIGS. 6, 7, and 9). Specifically, the second heat-sealing body 521 heat-melts the welding layers 96 and bottom welding layers of the first and second web sheets S1 and S2, melting adjacent layers in the thickness direction and thermally welding the first and bottom web sheets S4 and the bottom and second web sheets S4 and S2. The welding layers 96 and the core welding layers 934 of the first and second web sheets S1 and S2 are also heat-melted, melting adjacent layers in the thickness direction and thermally welding the first and second web sheets S1 and S3, the second and second web sheets S2 and S3, and the core inner surface 932. In this embodiment, the second cooling unit 522 cools the melted portions of the second heat-sealing body 521, solidifying the melted layers again and ensuring a reliable welding of the layers. In this way, in the second heat sealing step, heat sealing is performed without the guide portion 4 being interposed inside the core raw sheet S3, so that the core inner surfaces 932 of the core raw sheet S3 can be heat sealed together. In the second heat sealing step of this embodiment, the positions that become the ends of the packaging bag 9 in the longitudinal direction are heat sealed, so that the core inner surfaces 932 are heat sealed together at the ends of the packaging bag 9, and in the middle part, the core inner surfaces 932 can move away from each other.

[0073] In the cutting process, the heat-sealed first raw sheet S1, second raw sheet S2, inner material raw sheet S3, and bottom raw sheet S4 are cut at intermediate positions in the longitudinal direction. Specifically, the cutting mechanism 12 cuts the intermediate portions heat-sealed by the second heat-sealing section 52 (positions indicated by two-dot chain lines in FIGS. 6, 7, and 9).

[0074] Through the above steps, the packaging bag 9 is manufactured.

[0075] According to the manufacturing method of the packaging bag configured as described above, in the half-folding step, the core raw sheet S3 is fed from one introduction area A1 to the other introduction area A2 using the introduction section 21, and then introduced into the half-folding section 22, so that the supplying step and the heat welding step can be performed with the position of the core raw sheet S3 in the width direction stable. Therefore, according to this manufacturing method, it is possible to manufacture the packaging bag 9 in which the core film 93 is positioned with high positional accuracy.

[0076] Furthermore, since the core material raw sheet S3 is introduced by being wrapped around the first wrapping part 211 and the second wrapping part 212, the positions of which are adjustable, the introduction position can be adjusted and the position of the core material raw sheet S3 is stabilized.

[0077] Furthermore, since the core raw sheet S3 is supplied and heat-sealed via the guide section 4, the core raw sheet S3 can be appropriately positioned relative to the first raw sheet S1 and the second raw sheet S2 and heat-sealed.

[0078] Furthermore, since the heat welding is performed without using the guide portion 4 in the second heat welding step, the first raw sheet S1, the second raw sheet S2 and the core raw sheet S3 can be heat welded appropriately.

[0079] Furthermore, with the manufacturing device 1 for the packaging bag 9, the half-folding mechanism 2 can feed the core raw sheet S3 from one introduction area A1 to the other introduction area A2 using the introduction section 21, and then introduce it into the half-folding section 22, so that the core raw sheet S3 can be supplied and heat-sealed with the widthwise position of the core raw sheet S3 stable. Therefore, with this manufacturing device 1, it is possible to manufacture packaging bags 9 in which the core film 93 is positioned with good positional accuracy.

[0080] Furthermore, since the core material raw sheet S3 is introduced by being wrapped around the first wrapping part 211 and the second wrapping part 212, the positions of which are adjustable, the introduction position can be adjusted and the position of the core material raw sheet S3 is stabilized.

[0081] Furthermore, since the core raw sheet S3 is supplied and heat-sealed via the guide section 4, the core raw sheet S3 can be appropriately positioned relative to the first raw sheet S1 and the second raw sheet S2 and heat-sealed.

[0082] Furthermore, since the heat welding is performed in the second heat welding section without using the guide section 4, the first raw sheet S1, the second raw sheet S2 and the core raw sheet S3 can be heat-welded appropriately.

[0083] The above describes an embodiment of the present invention using an example, but the present invention is not limited to the above embodiment, and various modifications can be made within the scope that does not deviate from the gist of the present invention.

[0084] For example, although the case where the packaging bag 9 has the bottom 94 has been described, the present invention is not limited to this configuration, and the packaging bag 9 may have a configuration without the bottom 94. When such a configuration is adopted, for example, the bottom of the packaging bag 9 can be formed by heat welding the lower end of the first raw sheet S1 and the lower end of the second raw sheet S2.

[0085] Furthermore, although heat sealing has been described as an example of thermal welding, the present invention is not limited to this configuration, and other means of thermal welding, such as melt cutting, can also be used.

[0086] Furthermore, although an example of a configuration has been described in which holes are punched in the core raw sheet S3 that has been folded in half by the folding mechanism 2 using the hole punching mechanism 11, the configuration is not limited to this, and the core raw sheet S3 that has been punched with holes can also be folded in half by the folding mechanism 2.

[0087] Furthermore, although the configuration in which the positions of the first winding portion 211, the second winding portion 212, and the half-folded portion 22 can be adjusted by using elongated holes has been described as an example, the present invention is not limited to such a configuration, and various position-adjustable configurations can be adopted. Furthermore, the first winding portion 211, the second winding portion 212, and the half-folded portion 22 are not limited to being position-adjustable in both the width direction and the length direction, and may be configured so that their positions are adjustable only in either the width direction or the length direction. [Explanation of symbols]

[0088] 1... manufacturing apparatus, 11... hole mechanism, 111... pinhole forming section, 112... through-hole forming section, 113... needle section, 114... needle driving section, 115... hole punching section, 116... hole driving section, 12... cutting mechanism, 2... half-folding mechanism, 2A... core material half-folding mechanism, 21... introduction section, 211... first winding section, 212... second winding section, 22... half-folding section, 23... fixing section, 23a... long hole, 24... connecting section, 241... fixing Connection portion, 242...winding connection portion, 24a...long hole, 25...winding roller, 251...roller body, 252...winding guide, 26...half-folded guide portion, 27...triangular plate portion, 27a...triangular surface, 271...vertex portion, 272...bottom portion, 273...oblique side portion, 28...half-folded connection portion, 28a...long hole, 3...supply mechanism, 31...first supply portion, 32...second supply portion, 33...intermediate material supply portion, 34...bottom supply portion, 4 ...guide section, 5...heat sealing mechanism, 51...first heat sealing section, 511...first heat sealing main body section, 512...first cooling section, 52...second heat sealing section, 521...second heat sealing main body section, 522...second cooling section, 9...packaging bag, 91...first surface film, 92...second surface film, 93...internal material film, 93a...fold, 93b...through hole, 93c...pinhole, 931...internal material outer surface, 932...internal material Inner surface, 933...filler base layer, 934...filler welding layer, 94...bottom, 94a...cutout portion, 95...base layer, 96...welding layer, 97...bag body, 98...vertical seal portion, 991...first horizontal seal portion, 992...second horizontal seal portion, A1...one side introduction area, A2...other side introduction area, S1...first raw sheet, S2...second raw sheet, S3...filler raw sheet, S4...bottom raw sheet

Claims

1. A method for manufacturing a packaging bag comprising: a first surface film; a second surface film disposed opposite the first surface film; and an inner material film disposed in a half-folded state between the first surface film and the second surface film, a half-folding step of half-folding a long strip-shaped intermediate sheet that will become the intermediate film, using a half-folding mechanism including an introduction section for introducing the intermediate sheet and a half-folding section for folding the intermediate sheet introduced from the introduction section, so that a fold is formed along the longitudinal direction of the long strip; a supplying step of supplying the intermediate material raw sheet folded in half in the half-folding step between a long strip-shaped first raw sheet that will become the first surface film and a long strip-shaped second raw sheet that will become the second surface film and is arranged opposite the first raw sheet, with the long length direction aligned with the long length direction of the first raw sheet and the second raw sheet, and at a midpoint in the width direction of the first raw sheet and the second raw sheet; a heat welding step of heat welding the first raw sheet, the second raw sheet, and the intermediate raw sheet together in a state in which the intermediate raw sheet is supplied between the first raw sheet and the second raw sheet in the supply step, A method for manufacturing a packaging bag, wherein the half-folding process is a process of using the introduction section to feed the inner material raw sheet from one introduction area on one side where the fold is located in the width direction from the half-folding section to another introduction area on the other side opposite the one side in the width direction from the half-folding section, and introducing the inner material raw sheet from the other introduction area to the half-folding section.

2. the introduction section includes a first winding section disposed in the one introduction area and a second winding section disposed in the other introduction area, and the first winding section and the second winding section are configured to be adjustable in position relative to each other in at least one direction of a width direction and a length direction; 2. The method for manufacturing a packaging bag according to claim 1, wherein the half-folding step is a step of introducing the inner material raw sheet by wrapping the inner material raw sheet around the first wrapping portion and the second wrapping portion.

3. The supply step is a step of supplying the core material raw sheet with a guide portion interposed inside the core material raw sheet folded in half in the folding step, The method for manufacturing a packaging bag described in claim 2, wherein the heat welding process includes a first heat welding process of heat welding the first raw material sheet and the core raw material sheet, and the second raw material sheet and the core raw material sheet, with the guide portion interposed inside the core raw material sheet.

4. The method for manufacturing a packaging bag described in claim 3, wherein the heat welding process includes a second heat welding process after the first heat welding process, in which the first raw sheet, the second raw sheet, and the inner surfaces of the half-folded core raw sheet are heat-welded together without the guide portion being interposed.

5. A packaging bag manufacturing device that manufactures a packaging bag including a first surface film, a second surface film disposed opposite the first surface film, and a core film disposed in a half-folded state between the first surface film and the second surface film, A half-folding mechanism includes an introduction section that introduces a long strip-shaped intermediate raw sheet that becomes the intermediate film, and a half-folding section that folds the intermediate raw sheet introduced from the introduction section, and folds the intermediate raw sheet in half so that a fold is formed along the longitudinal direction of the long strip-shaped intermediate raw sheet; a supply mechanism for supplying the intermediate raw sheet folded in half by the folding mechanism between a long strip-shaped first raw sheet that will become the first surface film and a long strip-shaped second raw sheet that will become the second surface film and is arranged opposite the first raw sheet, with the long length direction aligned with the long length direction of the first raw sheet and the second raw sheet, to a midway position in the width direction of the first raw sheet and the second raw sheet; A heat welding mechanism that heat-welds the first raw sheet, the second raw sheet, and the intermediate raw sheet in a state where the intermediate raw sheet is supplied between the first raw sheet and the second raw sheet by the supply mechanism, The introduction section is configured to feed the inner material raw sheet from one introduction area on one side where the fold is located in the width direction from the half-fold section to another introduction area on the other side opposite the one side in the width direction from the half-fold section, and to introduce the inner material raw sheet from the other introduction area to the half-fold section.

6. The introduction section is disposed in the one introduction area and includes a first wrapping section around which the intermediate material raw sheet is wrapped, and a second wrapping section is disposed in the other introduction area and around which the intermediate material raw sheet sent from the one introduction area is wrapped, The packaging bag manufacturing device according to claim 5 , wherein the first and second winding portions are configured so that their positions relative to each other can be adjusted in at least one of the width direction and the length direction.

7. A guide portion is provided inside the inner material raw sheet folded in half by the folding mechanism and extends to the thermal welding mechanism, The packaging bag manufacturing device described in claim 5 or 6, wherein the heat welding mechanism includes a first heat welding section that heat welds the first raw material sheet and the core material sheet, and the second raw material sheet and the core material sheet, with the guide section interposed inside the core material sheet.

8. The heat welding mechanism includes a second heat welding section that heat-welds the first raw sheet and the second raw sheet, and the inner surfaces of the half-folded core raw sheet together after the heat welding at the first heat welding section, The packaging bag manufacturing device according to claim 7 , wherein the guide portion does not extend to the second heat-sealing portion.

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