Method for manufacturing packaging bag

Abstract

To manufacture a highly convenient packaging bag.SOLUTION: A first bonding step (A20) of bonding a peripheral edge, excluding one end edge portion, of a sheet-shaped inner surface sheet material to be an inner surface portion to the other surface portion having the other one end edge portion of a sheet-shaped exterior sheet material to be an exterior bag; a second bonding step (A50) of bonding first edge regions respectively set at one end edge portion of one surface portion of the exterior sheet material and one end edge portion of the inner surface sheet material, and second edge regions set at both end edge portions in a direction intersecting a predetermined direction without stretching a cushion sheet material to be a cushion portion in the direction intersecting the predetermined direction; And a folding-back step (A60) of interposing the cushioning sheet material between the inner surface sheet material and the one surface part without interposing the cushioning sheet material between the inner surface sheet material and the other surface part.SELECTED DRAWING: Figure 9

Description

[Technical Field]

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

[0002] One type of packaging material known is a sheet-like cushioning material with multiple slits arranged in a staggered pattern. This cushioning material, also known as cushion paper or honey paper, develops a honeycomb-like, three-dimensional cell structure when stretched in a direction intersecting the direction of the slits. When an item is wrapped in this stretched cushioning material, the three-dimensional cell structure cushions the impact on the item. Therefore, bags with the above-mentioned cushioning material inside have been proposed. For example, a packaging bag has been considered in which a cushioning material with multiple slits extending along the edges of the main bag is stretched between the opposing edges of the opening on the opposite side of the bottom (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-193376 Summary of the Invention [Problem to be solved by the invention]

[0004] In a packaging bag in which the above-described sheet-like cushioning material is bridged between the opposing edges around the opening of the bag, the internal space is divided by the cushioning portion into two areas, an area on the opening side and an area on the bottom side. This makes it difficult to store an article in the area separate from the area on the opening side (i.e., the area on the bottom side), which may result in the packaging bag being less convenient. Therefore, there is room for improvement in producing highly convenient packaging bags.

[0005] The invention disclosed herein was devised in view of the above-mentioned problems, and one of its objectives is to manufacture a highly convenient packaging bag. However, in addition to this objective, other objectives of the present invention include the effects and advantages derived from the configurations shown in the "Mode for Carrying Out the Invention" described below, which cannot be obtained with conventional technologies. [Means for solving the problem]

[0006] The method for manufacturing a packaging bag disclosed herein comprises the following components (1) to (7). (1) a bag-shaped outer bag having two opposing side surfaces, openings formed by one longitudinal edge portion of each of the side surfaces, and a bottom formed by the other longitudinal edge portion of each of the side surfaces, the bag-shaped outer bag being exposed to the outside; a sheet-like inner surface portion, the one longitudinal edge portion being provided at a position dividing the openings into a first opening which is a part adjacent to the one longitudinal edge portion of one of the openings, and a second opening which is a part adjacent to the one longitudinal edge portion of the other of the openings, the sheet-like inner surface portion dividing the inner space of the outer bag into a first internal space between the first opening and the bottom, and a second internal space between the second opening and the bottom; and a stretchable sheet-like buffer portion suspended only in the first internal space, the buffer portion having a plurality of slits provided in a staggered pattern and extending in a predetermined direction intersecting the suspension direction, a first laminating step of laminating a peripheral edge of a sheet-like inner sheet material that will become the inner portion, excluding the one end edge, to the other surface portion having the other one end edge of the sheet-like outer sheet material that will become the outer bag; a second lamination step in which, after the first lamination step has been performed, one of the surface portions having one of the one end edges of the exterior sheet material to which the peripheral edge of the inner sheet material has been laminated is folded at a fold along the horizontal direction and superimposed on the other surface portion via the inner sheet material, and the fold is disposed between the one end edge of one of the surface portions and the one end edge of the inner sheet material, and then laminating together first end edge regions set on the one end edge of one of the surface portions of the exterior sheet material and the one end edge of the inner sheet material, and second end edge regions set on both end edges in a direction intersecting the predetermined direction, without stretching the buffer sheet material serving as the buffer portion in a direction intersecting the predetermined direction; and a folding-back process, after the second laminating process is performed, in which the folded portion is returned to a flat state and the buffer sheet material is folded at the fold line portion along the predetermined direction, so that the buffer sheet material is interposed between the inner sheet material and one of the surface portions without being interposed between the inner sheet material and the other surface portion. A method for manufacturing a packaging bag. (2) In the first bonding step, the entire peripheral area of ​​the inner sheet material except for the one edge portion of the inner sheet material is bonded. A method for manufacturing a packaging bag according to (1). (3) a bag-shaped outer bag having two opposing side portions, an opening formed by one longitudinal edge portion of each of the side portions, and a bottom formed by the other longitudinal edge portion of each of the side portions, the bag-shaped outer bag being exposed to the outside; one longitudinal edge portion being provided at a position dividing the opening into a first opening which is a part adjacent to the one longitudinal edge portion of one of the openings, and a second opening which is a part adjacent to the one longitudinal edge portion of the other of the openings; a sheet-like inner surface portion arranged in an internal space of the outer bag; and an extensible sheet-like buffer portion suspended between one of the side portions and the inner surface, the extensible sheet-like buffer portion having a plurality of slits arranged in a staggered pattern and extending in a predetermined direction intersecting the suspension direction, wherein the other longitudinal edge portion of the inner surface is provided at a distance from the bottom in the vertical direction, a first laminating step of laminating only a lateral side edge portion of a sheet-like inner sheet material that will become the inner surface portion to one of the surface portions having one of the one end edges of a sheet-like outer sheet material that will become the outer bag; a second lamination step in which, after the first lamination step has been performed, one of the surface portions having one of the one end edges of the exterior sheet material to which the side end edge of the inner sheet material has been laminated is folded at a folding portion along the lateral direction and superimposed on the other surface portion, and the folding portion is disposed between the one end edge of the other surface portion and the one end edge of the inner sheet material, and first end edge regions set on the one end edge of the other surface portion of the exterior sheet material and the one end edge of the inner sheet material are laminated together, without stretching the buffer sheet material serving as the buffer portion in a direction intersecting the predetermined direction; and a folding back process, after the second laminating process is performed, in which the folded portion is returned to a flat state and the buffer sheet material is folded at the fold line portion along the predetermined direction, so that the buffer sheet material is interposed between the inner sheet material and one of the surface portions without being interposed between the inner sheet material and one of the surface portions. A method for manufacturing a packaging bag. (4) A method for manufacturing a packaging bag in which a flap for opening and closing the opening is provided so as to protrude from the one end edge portion of the other surface portion, a flap preparation step of preparing the exterior sheet material in which a flap sheet piece corresponding to the flap is provided in advance from the one end edge of the other surface portion, The first bonding step is carried out after the preparation step is carried out. A method for producing a packaging bag according to any one of (1) to (3). (5) A method for manufacturing a packaging bag in which a flap for opening and closing the opening is provided so as to protrude from the one end edge portion of the other surface portion, a flap-free preparation step of preparing the exterior sheet material without a flap sheet piece corresponding to the flap; a third laminating step of laminating the flap sheet piece to the exterior sheet material prepared in the no-flap preparation step, and extending the flap sheet piece from the one edge portion of the other surface portion. A method for producing a packaging bag according to any one of (1) to (3). (6) A manufacturing method of a packaging bag in which a window for visually observing an item in the internal space from the outside is provided on the other surface, a window-formed preparation step of preparing the exterior sheet material having a hole formed in advance on the other surface thereof corresponding to the window, The first lamination step is carried out after the window preparation step is carried out. A method for producing a packaging bag according to any one of (1) to (5). (7) A manufacturing method of a packaging bag in which a window through which an article in the internal space can be viewed from the outside is provided on the other surface, a windowless preparation step of preparing the exterior sheet material without holes corresponding to the windows; a window-making step of drilling the holes corresponding to the windows in the other surface of the exterior sheet material prepared in the windowless preparation step, The first bonding step is carried out after the window opening step. A method for producing a packaging bag according to any one of (1) to (5). (8) A window pasting step is included in which a transparent or translucent material is pasted on the window after the window opening step and before the first pasting step. A method for producing a packaging bag according to (6) or (7). [Effects of the Invention]

[0007] According to the disclosed method for manufacturing a packaging bag, a highly convenient packaging bag can be manufactured. [Brief explanation of the drawings]

[0008] [Figure 1]1 is a perspective view showing an unused packaging bag according to a first embodiment. FIG. [Figure 2] FIG. 2 is a longitudinal sectional view of FIG. [Figure 3] FIG. 2 is an enlarged plan view showing a main part of the buffer section in an unstretched state. [Figure 4] FIG. 2 is a vertical cross-sectional view showing the packaging bag according to the first embodiment in use. [Figure 5] FIG. 2 is an enlarged perspective view showing a main part of the buffer section in an extended state. [Figure 6] FIG. 6 is a cross-sectional view showing the cross section AA of FIG. 5. [Figure 7] 1A and 1B are plan views of sheet materials constituting a packaging bag according to a first embodiment, in which (A) shows a plan view of the sheet material constituting the outer bag, (B) shows a plan view of the sheet material constituting the inner surface, (C) shows a plan view of the sheet material (A) overlapped with the sheet material (B) and folded in a Z shape, and (D) shows a plan view of the sheet material constituting the buffer section. [Figure 8] 1A and 1B are schematic diagrams illustrating a method for manufacturing a packaging bag according to a first embodiment, in which (A) shows a first supplying step and a first bonding step, (B) shows a folding step, (C) shows a second supplying step and a second bonding step, (D) and (E) show a folding back step, and (F) shows a bag-making step. [Figure 9] 4 is a flowchart illustrating a manufacturing procedure for the packaging bag according to the first embodiment. [Figure 10] 10 is a flowchart illustrating a manufacturing procedure for a packaging bag according to a modified example of the first embodiment. [Figure 11] FIG. 10 is a vertical cross-sectional view showing an unused packaging bag according to a second embodiment. [Figure 12] FIG. 10 is a vertical cross-sectional view showing a packaging bag according to a second embodiment in use. [Figure 13] 10A and 10B are schematic diagrams illustrating a method for producing a packaging bag according to a second embodiment, in which (A) shows a first supplying step and a first laminating step, (B) shows a folding step, and (C) shows a second supplying step and a second laminating step. [Figure 14] FIG. 10 is a vertical cross-sectional view showing an unused packaging bag according to a third embodiment. [Figure 15] FIG. 10 is a vertical cross-sectional view showing a packaging bag according to a third embodiment in use. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, a method for manufacturing a packaging bag according to an embodiment will be described. The packaging bag manufactured by the method of this embodiment is a bag for packaging an article. In this embodiment, a packaging bag in which a buffer part and an inner surface part are provided inside an outer bag will be described. The outer bag, buffer section, and inner surface can be formed from sheet materials such as paper or paperboard, such as kraft paper, fine paper, medium-quality paper, art paper, coated paper, cast-coated paper, inkjet recording paper, Clupak paper, greaseproof paper, water-resistant paper, water-repellent paper, liner, and white paperboard; laminated paper, in which a thermoplastic resin such as polyethylene resin is laminated on one or both sides of such paper; nonwoven fabrics such as spunbond and spunlace; and plastic sheets, such as synthetic paper and film. Of these, paper and paperboard are preferred, and kraft paper and Clupak paper are particularly preferred. The outer bag, buffer section, and inner surface are preferably formed from the same type (identical) of material. However, the outer bag, buffer section, and inner surface may also be formed from different materials.

[0010] [I. First embodiment] In the first embodiment described below, the configuration of the product related to the packaging bag to be manufactured will be explained in item [1], and then the configuration of the method for manufacturing the packaging bag will be explained in item [2]. The actions and effects of the configurations of items [1] and [2] will be described in item [3]. [1. Packaging bag] In this section [1], the assembled packaging bag is described in subsection [1-1], and the sheet material that is assembled into the packaging bag is described in subsection [1-2]. In other words, the finished packaging bag is explained in subsection [1-1], and the sheet material that is the bag-making material for the packaging bag is explained in subsection [1-2].

[0011] [1-1. Packaging bag] In the explanation of this item [1-1], the horizontal direction is subdivided into four directions: forward (indicated by "F" in the drawings), rearward (indicated by "B" in the drawings), leftward (indicated by "L" in the drawings), and rightward (indicated by "R" in the drawings). The vertical direction is further subdivided into two directions: downward (indicated by "D" in the drawings) and upward (indicated by "U" in the drawings). The up-down direction along the upward and downward directions may be referred to as the vertical direction or the direction of inserting and removing items, and the left-right direction along the leftward and rightward directions may be referred to as the horizontal direction or the width direction.

[0012] As shown in Figs. 1 and 2, the packaging bag has two types of members inside a bag-shaped outer bag 10 exposed to the outside. One of the components inside the outer bag 10 is a buffer section 20 (first inner body) that protects the packaged item, and the other is an inner surface section 50 (second inner body) that forms a space like an inner pocket. Both the buffer section 20 and the inner surface section 50 are provided in the internal space of the outer bag 10, and therefore can also be said to be the inner body of the packaging bag. Hereinafter, the configuration of each of the exterior bag 10, the inner surface portion 50, and the buffer portion 20 will be described in that order.

[0013] <Outer bag> The outer bag 10 is an envelope-type bag without a gusset, with an opening 9 formed at the top that is opened and closed by a flap 19. Here, a rectangular envelope is exemplified as the outer bag 10, but a long envelope, a Western-style envelope, or a non-standard envelope may also be used as the outer bag. The outer bag 10 has a first surface 11 and a second surface 12 that face each other. For example, the first surface 11 is disposed on the rear side of the outer bag 10, and the second surface 12 is disposed on the front side of the outer bag 10.

[0014] These surface portions 11, 12 are connected to each other at a bottom portion 13 provided below the opening 9 of the outer packaging bag 10 and two side portions 14, 15 provided upright to connect the bottom portion 13 and the opening 9. An upper edge portion 110 (one of the edges) of the first surface portion 11 is located on one side of the opening 9 (the lower left side in FIG. 1), and an upper edge portion 120 (the other edge) of the second surface portion 12 is located on the other side of the opening 9 (the upper right side in FIG. 1). The opening 9 is defined and formed by the upper edge portion 110 of the first surface portion 11 and the upper edge portion 120 of the second surface portion 12. The bottom portion 13 is formed by connecting a lower edge portion 130 (one of the edges) of the first surface portion 11 and a lower edge portion 140 (the other edge) of the second surface portion 12.

[0015] The opening 9 of the outer packaging bag 10 is defined by an upper edge 110 of the first surface 11 and an upper edge 120 of the second surface 12, and therefore the entire area of ​​the opening 9 is surrounded by the upper edges 110, 120. An internal space S of the outer packaging bag 10 is formed in the area between the opening 9 and the bottom 13 and between the first surface 11 and the second surface 12. The illustrated first surface portion 11 has a folding portion 16 (described later) extending in the left-right direction in the vertically intermediate portion.

[0016] 2, the second surface portion 12 exemplified here is provided with a window 18. The window 18 is configured to allow the items (so-called "contents") stored in the internal space S to be viewed from the outside. This window 18 may be a simple hole drilled in the front and back of a part of the second surface portion 12, or a hole with a transparent or translucent material pasted on it (so-called window pasting).

[0017] 1 and 2, a flap 19 that opens and closes the opening 9 is connected to the second surface 12. The flap 19 shown here is provided to protrude upward from the second surface 12. In the exterior bag 10 provided as described above, the internal space S is partitioned by the inner surface portion 50, which will be described next.

[0018] <Inner part> The inner surface portion 50 is a sheet material disposed between the first surface portion 11 and the second surface portion 12 (midway in the front-to-rear direction) and divides the internal space S into two internal spaces S1 and S2. Of the two internal spaces S1 and S2, one is the first internal space S1 on the first surface portion 11 side, and the other is the second internal space S2 on the second surface portion 12 side. An upper edge 510 (one edge) of the inner surface portion 50 is provided at a position that divides the opening 9 into two regions.

[0019] A first opening 91 is defined between the upper edge 510 of the inner surface 50 and the upper edge 110 of the first surface 11. A second opening 92 is defined between the upper edge 510 of the inner surface 50 and the upper edge 120 of the second surface 12. The first opening 91 is a partial area of ​​the opening 9 adjacent to the upper edge 110 of the first surface 11. The second opening 92 is a partial area of ​​the opening 9 adjacent to the upper edge 120 of the second surface 12.

[0020] Below the first opening 91 and above the bottom 13 (between the first opening 91 and the bottom 13), a first internal space S1 is defined, sandwiched from the front and rear by the first surface 11 and the inner surface 50. Furthermore, below the second opening 92 and above the bottom 13 (between the second opening 92 and the bottom 13), a second internal space S2 is defined, sandwiched from the front and rear by the second surface 12 and the inner surface 50.

[0021] Since the second internal space S2 is divided by the second surface portion 12, the interior of the second internal space S2 can be seen through a window 18 (see FIG. 2) provided in the second surface portion 12. The inner surface portion 50 illustrated here has its peripheral edge, excluding the upper edge portion 510, adhered to the outer bag 10 without any gaps. Here, an example is shown in which the peripheral edge of the inner surface portion 50 is adhered to the second surface portion 12.

[0022] <Buffer section> The buffer section 20 is also called cushion paper or honey paper, and is a sheet-like buffer material with a plurality of slits 23a arranged in a staggered pattern. The buffer section 20 is suspended between one of the two surface sections 11, 12 and the inner surface section 50. Specifically, the buffer section 20 is suspended between the upper edge section 110 of the first surface section 11 and the upper edge section 510 of the inner surface section 50, and is provided in the first internal space S1. The buffer section 20 suspended in this manner is not provided in the second internal space S2, but is provided only in the first internal space S1.

[0023] This buffer portion 20 is broadly divided into two parts: attached end portions 21, 22 that are attached to the upper edge portions 110, 510 of the surface portions 11, 50, and a main body portion 23 that is provided inside the outer bag 10 in a suspended state (hanging state) between these attached end portions 21, 22. Here, the first attachment end portion 21 is attached to the inner surface 111 of the upper edge portion 110 of the first surface portion 11, and similarly, the second attachment end portion 22 is attached to the inner surface 511 of the upper edge portion 510 of the inner surface portion 50. On the other hand, the main body portion 23 is not attached to either portion.

[0024] Here, the buffer section 20 is shown in a state where it is folded in half at the central fold line 230 in the suspension direction connecting the first attachment end 21 and the second attachment end 22. The main body 23 of the buffer section 20 folded in half in this manner is roughly divided into two parts, a first main body 231 on the first attachment end 21 side and a second main body 232 on the second attachment end 22 side, as shown in Figure 2, sandwiched between the fold line 230.

[0025] Furthermore, when an article 1 (see FIG. 4) placed in the first internal space S1 of the packaging bag is placed on the main body 23 through the opening 9, the main body 23 expands due to the weight of the article 1. In other words, before the item 1 is placed in the packaging bag (when the packaging bag is unused), the buffer section 20 is in an unstretched state (hereinafter referred to as the "unstretched state"), and after the item 1 is placed in the packaging bag (when the packaging bag is in use), the buffer section 20 is in a stretched state (hereinafter referred to as the "stretched state"). The structure that enables the buffer section 20 to be stretched in this manner is provided in the main body section 23 . Below, the main body portion 23 in the unstretched state will be described, followed by the main body portion 23 in the stretched state.

[0026] First, the main body portion 23 in an unstretched state will be described with reference to FIG. A large number of notches 23a are cut into the main body 23. These notches 23a are provided in at least the main body 23 of the buffer section 20. The notch 23a extends in a direction (hereinafter referred to as the "width direction") perpendicular to the suspension direction (here, the up-down direction).

[0027] The notches 23a are arranged discontinuously in the width direction, that is, between adjacent notches 23a in the width direction, there are provided non-notched portions 23b. The width direction dimension of the notched portion 23a is set to be larger than the width direction dimension of the non-notched portion 23b. In other words, if the dimension of the notched portion 23a is "L1" and the dimension of the non-notched portion 23b is "L2", then Inequality 1 "L1>L2" is satisfied.

[0028] Here, a first pattern P1 is defined as one row in which the notched portions 23a and the non-notched portions 23b are arranged alternately along the width direction. A second pattern P2 is defined as another row in which the notched portions 23a' and the non-notched portions 23b' are arranged alternately along the width direction and are shifted by half a pitch from the notched portions 23a and the non-notched portions 23b of the first pattern P1. The first pattern P1 and the second pattern P2 are arranged alternately along the suspension direction.

[0029] Specifically, the width direction center C of the cut portion 23a in the first pattern P1 a and the width direction center C of the non-slit portion 23b′ in the second pattern P2 b Similarly, the width direction center C of the non-slit portion 23b in the first pattern P1 is b and the width direction center C of the cut portion 23a′ in the second pattern P2 a' are arranged side by side along the suspension direction.

[0030] The buffer section 20 having the main body 23 provided with the cut portions 23a, 23a' and the non-cut portions 23b, 23b' is manufactured by cutting an uncut sheet material while rotating it using a rotary die cutter having blades (cutter) on its outer periphery that correspond to the cut portions 23a, 23a'. Alternatively, the buffer section 20 is manufactured by cutting an uncut sheet material while pressing it using a flat die cutter having blades that correspond to the cut portions 23a, 23a'.

[0031] The sheet piece on one side of the suspension direction (upward in Figure 3) relative to the cut portion 23a of the first pattern P1 is broadly divided into a first piece portion 31, a second piece portion 32, and a third piece portion 33 depending on its position relative to the cut portion 23a' and non-cut portion 23b' of the second pattern P2. The first piece 31 is a portion sandwiched between one widthwise side of the notch 23a of the first pattern P1 (the left side in FIG. 3) and the other widthwise side of the notch 23a' of the second pattern P2 (the right side in FIG. 3). The second piece 32 is a portion sandwiched between the widthwise center of the notch 23a of the first pattern P1 and the non-notch 23b' of the second pattern P2. The third piece 33 is a portion sandwiched between the other widthwise side of the notch 23a of the first pattern P1 and one widthwise side of the notch 23a' of the second pattern P2.

[0032] The other sheet piece in the suspension direction relative to the cutout portion 23a of the first pattern P1 is roughly divided into a fourth piece 34, a fifth piece 35 and a sixth piece 36, similar to the pieces 31, 32 and 33 described above. The fourth piece 34 is sandwiched between one widthwise side of the notch 23a of the first pattern P1 and the other widthwise side of the notch 23a' of the second pattern P2. The fifth piece 35 is sandwiched between the widthwise center of the notch 23a of the first pattern P1 and the non-notch portion 23b' of the second pattern P2. The sixth piece 36 is sandwiched between the other widthwise side of the notch 23a of the first pattern P1 and one widthwise side of the notch 23a' of the second pattern P2.

[0033] Next, the main body 23 in the stretched state will be described with reference to FIGS. As shown in Fig. 4, the main body portion 23 in the stretched state is elongated in the suspension direction compared to the main body portion 23 in the unstretched state (see Fig. 3). In this state, the pieces 31 to 36 (see Figs. 5 and 6) of the main body portion 23 rise from the suspension direction in the thickness direction of the surface portions 11, 12 (the thickness direction of the main body portion 23 in the unstretched state), and the rising pieces 31 to 36 form a three-dimensional buffer cell 40. In other words, the pieces 31 to 36 arranged around one slit 23a rise up, and one buffer cell 40 appears.

[0034] In detail, as shown in Figure 5, a first wall portion 41 corresponding to the first arm portion 31, a second wall portion 42 corresponding to the second arm portion 32, a third wall portion 43 corresponding to the third arm portion 33, a fourth wall portion 44 corresponding to the fourth arm portion 34, a fifth wall portion 45 corresponding to the fifth arm portion 35, and a sixth wall portion 46 corresponding to the sixth arm portion 36 are erected in the buffer cell 40 to form each side wall of the hexagonal tube.

[0035] In addition, when the main body 23 is geometrically stretched to the maximum extent possible without being damaged (hereinafter referred to as the "maximum stretched state"), the first wall 41 and the fourth wall 44 are aligned along the same plane, the third wall 43 and the sixth wall 46 are aligned along another same plane, and the second wall 42 and the fifth wall 45 face each other. Therefore, in the buffer cell 40 in the maximum stretched state, the walls 41 to 46 are erected to form the side walls of a rectangular cylinder.

[0036] As described above, the main body portion 23 after stretching is in a state (hereinafter referred to as a "mat-like") that is thicker than the sheet-like state of the main body portion 23 before stretching. In this mat-like state where the dimension in the thickness direction is secured, a deformation allowance for shock absorption, i.e., a buffer allowance, is formed in the main body portion 23. In this way, the shape of the main body portion 23 that has changed from an unstretched state to an extended state changes from the sheet-like state to the mat-like state by stretching. Note that, basically, the main body portion 23 that has changed from the sheet-like state to the mat-like state will not return to the sheet-like state, and the shape of the main body portion 23 will change irreversibly with only a slight recovery due to a restoring force.

[0037] As shown in FIG. 4, the buffer section 20 in the stretched state is provided so as not to come into contact with the bottom section 13 of the outer bag 10. Specifically, the fold line 230 located at the lowest position in the buffer section 20 in the maximally stretched state is arranged not to come into contact with the bottom 13 of the outer bag 10. In other words, if the vertical dimension between the upper ends 21a, 22a of the attached ends 21, 22 of the buffer section 20 and the bottom 13 of the outer bag 10 is "M1," and the vertical dimension between the upper ends 21a, 22a and the fold line 230 in the buffer section 20 in the maximally stretched state is "M2," then inequality 2 "M1>M2" is satisfied.

[0038] Furthermore, it is preferable to set "M2" as large as possible while satisfying Inequality 2, so that it approaches "M1". 2, the fold line 230 of the buffer section 20 in an unstretched state is provided above the bottom 13 of the outer bag 10 by a predetermined dimension "M3" so that the buffer section 20 in a maximally stretched state does not come into contact with the bottom 13 of the outer bag 10. In other words, the buffer section 20 is formed short in anticipation of expansion margins.

[0039] Next, with reference to FIG. 4, an example of setting the dimensions of the buffer section 20 to achieve the above-mentioned non-contact structure will be described. If the number of rows of patterns P1, P2 in buffer section 20 is "N" and the vertical dimension of attachment ends 21, 22 is "M4", approximate formula 3 "M2-M4≈(L1-L2)×(N / 4)" holds. The left side of this approximation formula 3 represents the vertical dimension of the first main body portion 231 or the second main body portion 232 in the maximum stretched state. On the other hand, (L1-L2) on the right side of approximation formula 3 represents the dimension in the suspension direction per buffer cell 40 in the maximum stretched state, that is, the dimension in the suspension direction of the first wall portion 41 and the fourth wall portion 44.

[0040] Furthermore, since the number of buffer cells 40 arranged in the suspension direction in the main body portion 23 is half (N / 2) of the number of rows in patterns P1 and P2, (N / 4) on the right side of approximation formula 3 represents the number of buffer cells 40 arranged in the suspension direction in the first main body portion 231 or the second main body portion 232. Here, if we ignore the suspension direction dimensions of the second wall portion 42 and the fifth wall portion 45 extending in the width direction, the value obtained by multiplying the number (N / 4) of buffer cells 40 lined up in the suspension direction in the first main body portion 231 or the second main body portion 232 by the suspension direction dimension (L1-L2) per buffer cell 40 in the maximum extended state (the right side of approximation formula 3) can be said to approximate the vertical dimension of the first main body portion 231 or the second main body portion 232 in the maximum extended state.

[0041] Therefore, the above-mentioned non-contact structure can be designed by appropriately setting the parameters corresponding to each term in approximate formula 3, such as the widthwise dimensions L1, L2 of the notched portion 23a or non-notched portion 23b, the number of rows of the patterns P1, P2, and the vertical dimension M4 of the attachment ends 21, 22.

[0042] [1-2. Sheet material] Next, with reference to FIG. 7, the sheet material to be assembled into the above-mentioned packaging bag will be described. The sheet material exemplified here is composed of three members: an exterior sheet material 10S assembled into the exterior bag 10; an inner sheet material 50S assembled into the inner surface portion 50; and a buffer sheet material 20S assembled into the buffer portion 20.

[0043] In other words, the packaging bag is made up of an outer bag 10 having a first surface portion 11 and a second surface portion 12, an inner surface portion 50, and a buffer portion 20, which are separate components, and is assembled by bonding together the three components of the outer sheet material 10S, the inner sheet material 50S, and the buffer sheet material 20S. However, the outer bag 10 and the buffer section 20 may be one component, the inner surface section 50 and the buffer section 20 may be one component, or the outer sheet material 10S, the inner surface sheet material 50S and the buffer sheet material 20S may be one component.

[0044] In the explanation of this section [1-2], we will describe a sheet material placed on a horizontal surface. This sheet material will be explained using the X direction (horizontal direction) and the Y direction (vertical direction), which are orthogonal to each other in the horizontal direction. The X direction and the Y direction each extend in two directions opposite to each other. Therefore, for each of the X direction and the Y direction, one will be indicated with a subscript "1" and the other with a subscript "2." For example, one of the X directions will be indicated as the X1 direction, and the other as the X2 direction. The configurations of the exterior sheet material 10S, the interior sheet material 50S, and the buffer sheet material 20S will be described below in that order.

[0045] <Exterior sheet material> As shown in FIG. 7(A), the exterior sheet material 10S has three horizontal lines R extending in the X direction. X1 ,R X2 ,R X3 (fold lines) are arranged side by side in the Y direction, and two vertical creases R extending in the Y direction Y1 ,R Y2 (fold lines) are arranged in the X direction. X1 ,R X2 ,R X3 are arranged in this order in the Y2 direction. X1 Second horizontal line R X2 is placed on the Y2 side, and the second horizontal ruled line R X2 Third horizontal line R X3 is located on the Y2 side. Y1 ,R Y2 is the first vertical ruled line RY1 The other second vertical ruled line R Y2 It is located on the X1 side of the

[0046] Three horizontal lines R X1 ,R X2 ,R X3 Among them, the first horizontal ruled line R X1 is a folding line for sealing the outer bag 10, and the second horizontal line R X2 is a folding line for assembling the exterior sheet material 10S into a bag shape. X3 is a folding line for easily bonding the exterior sheet material 10S to the buffer sheet material 20S. X3 Although not an essential component for assembling the exterior sheet material 10S, it has the function of facilitating the production of the packaging bag.

[0047] The exterior sheet material 10S has a second horizontal crease R X2 and two vertical lines R Y1 ,R Y2 and folded along the first horizontal crease R X1 The flap 19 is folded at the second horizontal line R to close the opening 9 (see FIGS. 1 and 2). X2 is a folding line corresponding to the bottom 13 of the outer bag 10 (see FIGS. 1 and 2, the portion facing the opening 9).

[0048] First horizontal ruled line R X1 and second horizontal ruled line R X2 and two vertical lines R Y1 ,R Y2 The rectangular shape defines the second sheet piece 12S corresponding to the second surface portion 12. The second sheet piece 12S has a first horizontal crease R X1 A flap sheet piece 19S corresponding to the flap 19 is connected to the Y1 direction side via the second horizontal line R X2 A first sheet piece 11S corresponding to the first surface portion 11 is connected to the Y2 direction side via the hole 11. In addition, a hole corresponding to the window 18 (in Figure 7(A) the hole 18 is shown with the same reference numeral as the window 18) is drilled in the second sheet piece 12S. The first sheet piece 11S has a third horizontal crease R X3 The inner sheet piece 111S is provided on the Y1 direction side of the third horizontal crease R X3 An outer sheet piece 112S is provided on the Y2 direction side of the sheet piece 112S.

[0049] In the illustrated exterior sheet material 10S, adhesive sheet pieces 18S are provided on both the X1 direction side and the X2 direction side of the second sheet piece 12S, along the longitudinal crease R Y1 ,R Y2 The adhesive sheet piece 18S is connected to the exterior sheet material 10S along the second horizontal crease R X2 The adhesive sheet piece 18S is attached to the surface of the first sheet piece 11S (corresponding to the outer surface of the first surface portion 11) that faces when the sheet is folded. However, the adhesive sheet piece 18S may be connected to the first sheet piece 11S.

[0050] Furthermore, an exterior attachment area 110S to which the buffer sheet material 20S is attached is set on the edge of the first sheet piece 11S on the Y2 direction side. The exterior attachment area 110S is an area corresponding to the inner surface 111 of the upper edge portion 110 of the first surface portion 11. In other words, the exterior attachment area 110S is provided on the surface of the first sheet piece 11S that will become the inside of the exterior bag 10.

[0051] <Inner sheet material> As shown in Fig. 7(B), the inner sheet material 50S has no ruled lines and has attachment areas 510S, 520S to which the second sheet piece 12S and the buffer sheet material 20S are attached. The inner sheet material 50S is approximately the same size as or slightly smaller than the second sheet piece 12S in a plan view.

[0052] Of the attachment regions 510S, 520S, the peripheral attachment region 510S attached to the second sheet piece 12S is set on the edge (corresponding to the peripheral edge of the inner surface portion 50) along three sides in the X1 direction, X2 direction, and Y2 direction. In other words, the peripheral attachment region 510S extends along the entire peripheral region of the inner sheet material 50S except for the upper edge portion 510 that defines the second opening 92. This peripheral attachment region 510S is set on the surface of the inner sheet material 50S that faces the second sheet piece 12S.

[0053] Of the attachment areas 510S, 520S, the inner surface attachment area 520S that is attached to the buffer sheet material 20S is set on the edge on the Y1 direction side (corresponding to the upper edge 510 of the inner surface portion 50). The inner surface attachment area 520S is set on the surface (front side) of the inner sheet material 50S opposite to the peripheral edge attachment area 510S. In other words, the inner surface attachment area 520S is set on the surface (front side) that faces the first sheet piece 11S across the buffer sheet material 20S. The inner sheet material 50S is placed on the surface that will be the inner side of the second sheet piece 12S of the unfolded exterior sheet material 10S as shown in FIG. 7(A).

[0054] Here, the configuration in which the exterior sheet material 10S and the interior sheet material 50S are superimposed will be described in detail. In the manufacturing process of the packaging bag, the exterior sheet material 10S is formed along the second horizontal line R as shown in FIG. 7(C). X2 and the third horizontal ruled line R X3 and are folded in opposite directions to each other, thereby forming a Z-shape when viewed from the X direction. In the exterior sheet material 10S folded in a Z-shape, the second sheet piece 12S, the inner sheet piece 111S, and the outer sheet piece 112S are arranged overlapping each other in this order.

[0055] With respect to the exterior sheet material 10S folded in a Z-shape in this way, the inner sheet material 50S is arranged in a state in which the Y2-direction half of the inner sheet material 50S is sandwiched between the second sheet piece 12S and the inner sheet piece 111S. In this state, a third horizontal ruled line R is formed in the approximate middle between the inner surface attachment area 520S of the inner sheet material 50S and the exterior attachment area 110S of the first sheet piece 11S, which are spaced apart from each other in the Y direction. X3 The folded portion 16 is formed corresponding to the above-mentioned. The folded portion 16 is a mountain-folded portion of the surface of the first sheet piece 11S that will become the inside of the outer packaging bag 10 (the inner surface of the first surface portion 11). When the exterior sheet material 10S is folded in a Z-shape, the dimension L3 between the attachment areas 110S and 520S is shorter than when it is not folded (unfolded).

[0056] <Buffer sheet material> 7(D), buffer attachment areas 21S, 22S (second edge areas) are set at the Y1-direction and Y2-direction end portions of the buffer sheet material 20S to be attached to the exterior attachment area 110S (first edge area) and the inner attachment area 520S (first edge area). The buffer attachment areas 21S, 22S correspond to the attachment ends 21, 22 of the buffer section 20 described above. Note that the buffer attachment areas 21S, 22S do not have the notches 23a. Further, the buffer sheet material 20S has a fourth horizontal ruled line R extending in the X direction (predetermined direction). X4 is provided in the center in the Y direction. X4 is a fold line corresponding to the fold line portion 230.

[0057] A main body sheet piece 23S corresponding to the main body portion 23 is provided in the area of ​​the buffer sheet material 20S excluding the buffer attachment areas 21S and 22S. The main body sheet piece 23S has the above-mentioned slits 23a formed in a staggered pattern. Each slit 23a extends along the X direction. Furthermore, the main body sheet piece 23S has a fourth horizontal line R X4 On the Y2 direction side of the fourth horizontal ruled line RX4 On the other hand, a second main body sheet piece 232S corresponding to the second main body portion 232 is provided on the Y1 direction side.

[0058] 7(C) and (D), the dimension L4 between the cushioning attachment areas 21S and 22S of the cushioning sheet material 20S is set equal to the dimension L3 between the exterior attachment area 110S of the exterior sheet material 10S in the Z-folded state as described above and the inner attachment area 520S of the inner sheet material 50S superimposed on the second sheet piece 12S of the exterior sheet material 10S in the Z-folded state. In other words, the third horizontal ruled line R X3 The position of the folding portion 16 in the Y direction is set so that the above dimensions L3 and L4 are equal to each other.

[0059] This third horizontal ruled line R X3 With this setting, when the Z-folded exterior sheet material 10S, the interior sheet material 50S, and the buffer sheet material 20S are arranged in an overlapping manner, the exterior attachment area 110S and the first buffer attachment area 21S overlap, and the interior attachment area 520S and the second buffer attachment area 22S overlap. Therefore, the exterior attachment area 110S and the interior attachment area 520S can be attached to the buffer attachment areas 21S and 22S without stretching the buffer sheet material 20S in the Y direction. Note that when the attachment areas 110S, 520S, 21S, and 22S are arranged in an overlapping manner, the fold 16 (third horizontal line R X3 ) and fourth horizontal ruled line R X4 also overlap each other.

[0060] [2. Packaging bag manufacturing method] Next, a method for manufacturing the packaging bag will be described. As described above, the packaging bag to be manufactured by this method changes into a state in which the buffer cells 40 stand up and appear, thereby providing a buffering function, when the buffer section 20 is stretched by the item 1. In other words, because the buffer section 20 in an unstretched state is sheet-shaped, the bulkiness of the packaging bag when unused can be reduced compared to packaging bags that use a buffer material with a buffering deformation allowance, such as an air cushion or a foam cushion.

[0061] Therefore, in the manufacturing method described in detail below, the first interior material that becomes the buffer portion 20 is bonded to the exterior material that becomes the outer bag 10 without stretching the first interior material, and the second interior material that becomes the inner surface portion 50 is also bonded to the exterior material. In the manufacturing method exemplified here, a pre-cut sheet of exterior sheet material 10S is used as the exterior material that becomes the exterior bag 10, and a sheet of cushioning sheet material 20S is used as the first interior material that becomes the cushioning section 20. Similarly, a sheet of inner sheet material 50S is used as the second interior material that becomes the inner surface section 50.

[0062] However, the second interior material to be the buffer section 20 may be a continuous strip (hereinafter referred to as "interior material raw material"), and the unwound interior material raw material may be cut to obtain the individual cushioning sheet materials 20S. The arrangement of the interior material raw material is not particularly limited as long as it can be unwound. For example, the arrangement of the interior material raw material may be wound or folded in a Z-shape.

[0063] Hereinafter, the manufacturing method according to this embodiment will be described step by step with reference to FIG. First, as shown in FIG. 8(A), an exterior sheet material 10S and an interior sheet material 50S are supplied. Then, the peripheral attachment region 510S of the inner sheet material 50S is attached to the second sheet piece 12S of the exterior sheet material 10S. By attaching the peripheral attachment region 510S to the second sheet piece 12S in this manner, a space corresponding to the second internal space S2 (see FIGS. 1, 2, and 4) is formed between the second sheet piece 12S and the inner sheet material 50S.

[0064] Next, as shown in Fig. 8(B), the exterior sheet material 10S to which the inner sheet material 50S has been attached is folded into a Z shape. Specifically, the exterior sheet material 10S is folded along the second horizontal line R so that the first sheet piece 11S faces the second sheet piece 12S. X2 Fold it at the second horizontal line R X2 The first sheet piece 11S is folded in the opposite direction to the folding direction along the third horizontal crease R X3Fold along the second horizontal line R. X2 and the third horizontal ruled line R X3 and bend them in opposite directions.

[0065] As a result, the Y2-side half of the inner sheet material 50S is sandwiched between the second sheet piece 12S and the inner sheet piece 111S. In this state, the Y2-side half of the second sheet piece 12S, the Y2-side half of the inner sheet material 50S, the inner sheet piece 111S, and the outer sheet piece 112S are stacked in this order, forming the bottom 13 and the folded portion 16. The folded portion 16 is positioned between the exterior attachment area 110S and the inner attachment area 520S.

[0066] 8(C), a buffer sheet material 20S is supplied, and then the buffer attachment areas 21S and 22S of the supplied buffer sheet material 20S are attached to the exterior attachment area 110S and the inner attachment area 520S. 8(D) and 8(E), the folded portion 16 is returned to a flat state, and the cushioning sheet material 20S is folded along the fourth horizontal line R. X4 The first sheet piece 11S, which has been folded into a V shape at the folding portion 16, is returned to a flat state, whereby the exterior sheet material 10S is folded back from a Z shape to a V shape, and the buffer sheet material 20S is folded in half in conjunction with this.

[0067] As a result, as shown in FIG. 8(E), the exterior sheet material 10S is folded in half at the bottom 13, and the first sheet piece 11S and the second sheet piece 12S are arranged with the inner sheet material 50S sandwiched therebetween. Inside the exterior sheet material 10S folded in half in this way, the cushioning sheet material 20S folded in half is placed between the inner sheet material 50S and the first sheet piece 11S. Therefore, the cushioning sheet material 20S is interposed between the first sheet piece 11S (specifically, the outer sheet piece 112S) and the inner sheet material 50S, which face each other. The exterior sheet material 10S is thus made into a bag at the same time as the cushioning sheet material 20S is placed inside.

[0068] Finally, as shown in FIG. 8(F), the adhesive sheet piece 18S is folded over and glued onto the first sheet piece 11S in the same manner as in normal bag making.

[0069] In the above-described manufacturing method, the steps shown in FIG. 9 are carried out in order. First, a first supplying step (step A10) of supplying the exterior sheet material 10S is carried out. The first supplying step can also be called a preparation step, since it prepares materials to be made into packaging bags.

[0070] In the first supplying step exemplified here, an exterior sheet material 10S in which a flap sheet piece 19S is connected to a second sheet piece 12S is prepared and supplied. The first supplying step, which involves preparing an exterior sheet material 10S in which a flap sheet piece 19S corresponding to the flap 19 is pre-set to protrude from one edge portion corresponding to the upper edge portion 120 of the second surface portion 12, may also be referred to as a flap preparation step. In the first supplying step given as an example here, an exterior sheet material 10S is prepared and supplied in which holes corresponding to the windows 18 have been drilled in advance. The first supplying step involving the preparation of an exterior sheet material 10S in which holes have been drilled in advance in this manner may also be referred to as a windowed preparation step.

[0071] After the first supplying step, a first bonding step (step A20) is carried out in which the peripheral bonding region 510S of the inner sheet material 50S is bonded to the second sheet piece 12S of the exterior sheet material 10S. In this first bonding step, the entire peripheral bonding region 510S of the inner sheet material 50S is bonded. Since the inner sheet material 50S is bonded in the first bonding step, preparation steps such as a flap preparation step and a windowless preparation step for preparing the inner sheet material 50A are naturally carried out before the first bonding step. Note that if a material without a transparent or translucent material attached to the hole (window 18) is prepared in the first supply step, a window attachment step for attaching a transparent or translucent material to the hole (window 18) may be carried out after the first supply step and before the first bonding step.

[0072] After the first laminating step is performed, the outer sheet material 10S in which the inner sheet material 50S is laminated to the second sheet piece 12S in the first laminating step is laminated along the second horizontal crease R corresponding to the bottom portion 13. X2 and the third horizontal crease R corresponding to the fold 16 X3 Then, a folding step (step A30) is carried out in which the exterior sheet material 10S is folded into a Z shape by folding the exterior sheet material 10S at both ends. In the folding step, the exterior sheet material 10S is folded along the second horizontal crease R so that the first sheet piece 11S faces the second sheet piece 12S. X2 After the first folding step (step A32) of folding the sheet along the second horizontal line R X2 The first sheet piece 11S is folded in the opposite direction to the folding direction along the third horizontal crease R X3 Then, a second folding step (step A34) is carried out.

[0073] In parallel with the execution of the first supplying step, the first bonding step, and the folding step, a second supplying step is executed to supply the buffer sheet material 20S (step A40). After the first supplying step, the first bonding step, and the folding step are performed and after the second supplying step is performed, the second bonding step (step A50) is performed. The second bonding step is performed in a state where the first sheet piece 11S is folded at the folding portion 16 and overlapped on the second sheet piece 12S via the inner sheet material 50S, and the folding portion 16 is disposed between the exterior attachment area 110S (one edge) of the first sheet piece 11S and the inner attachment area 520S (one edge) of the inner sheet material 50S. In the second bonding step, the buffer attachment areas 21S, 22S of the buffer sheet material 20S are bonded to the exterior attachment area 110S and the inner attachment area 520S.

[0074] After the second lamination step, the folded portion 16 of the exterior sheet material 10S is returned to a flat state, and the buffer sheet material 20S is folded along the fourth horizontal crease R corresponding to the fold line 230. X4 Then, a folding back step (step A60) is carried out in which the first sheet piece 11S of the exterior sheet material 10S is folded back and the double-folded buffer sheet material 20S is interposed between the first sheet piece 11S of the exterior sheet material 10S and the inner sheet material 50S. The folding back process can also be said to be a process of interposing the buffer sheet material 20S between the inner sheet material 50S and the first sheet piece 11S without interposing the buffer sheet material 20S between the inner sheet material 50S and the second sheet piece 12S. After the folding back step is performed, another bag-making step is performed in which the adhesive margin sheet piece 18S is folded over and glued onto the first sheet piece 11S, as in the normal bag-making step (step A70).

[0075] [3. Actions and Effects] The packaging bag and the manufacturing method of the packaging bag of this embodiment have the above-mentioned configuration, and therefore can achieve the following actions and effects. In this section [3], the actions and effects achieved by the manufactured packaging bag are described in subsection [3-1], and then the actions and effects achieved by the manufacturing method of the packaging bag are described in subsection [3-2].

[0076] [3-1. Packaging bag] (1A) By placing the item 1 in the first internal space S1 of the packaging bag and placing it on the main body 23 of the buffer section 20, the sheet-like main body 23 stretches in an unstretched state, and three-dimensional buffer cells 40 corresponding to each of the slits 23a appear in the stretched main body 23. By surrounding the item 1 with the buffer cells 40 appearing in the first internal space S1 of the outer bag 10, the protection of the item 1 can be ensured and the packaging bag can have buffering properties. Since the main body 23 in an unstretched state is sheet-shaped, the bulkiness of the packaging bag when unused can be reduced compared to packaging bags that use cushioning materials with deformation allowances for cushioning, such as air cushions, foam cushions, and single-sided corrugated cardboard.

[0077] In addition, when providing a cushioning material separately from the outer bag in a conventional packaging bag, the entire cushioning material needs to be attached to the outer bag in order to fix the cushioning material to the outer bag. In contrast, in the present packaging bag, since the cushioning section 20 is suspended, it is sufficient to attach only a portion of the cushioning section 20 to the outer bag 10, which reduces the amount of adhesive or sticky material used. Furthermore, the buffer section 20 is formed short to allow for expansion, as it exerts its buffering function by expanding in the first internal space S1 of the outer bag 10. Therefore, the amount or weight of the buffer material can be reduced compared to packaging bags in which single-faced corrugated cardboard sheets, which are manufactured by fluting a flat material sheet, are used as the buffer material.

[0078] As mentioned in the "Background Art" section, in conventional packaging bags in which a sheet-like cushioning material is stretched between the opposing edges around the opening of the bag, the internal space is divided by the cushioning portion into two areas: an area on the opening side and an area on the bottom side. In such conventional packaging bags, when attempting to store an item whose length or size is close to the vertical dimensions of the first or second surface, it is necessary to stretch the buffer section more than necessary or fold the item. In other words, in conventional packaging bags, it is difficult to store an item whose length or size spans both the opening and bottom regions of the buffer section in the internal space without stretching the buffer section or folding another item. In other words, in conventional packaging bags, it is difficult to store an item (such as an invoice or instruction manual) other than the item stored in the opening region in a region other than the opening region (i.e., the bottom region). This may result in insufficient convenience for the packaging bag.

[0079] (2A) In contrast, the packaging bag has an inner surface 50 that divides the inner space S into a first inner space S1 in which the buffer section 20 is suspended and a second inner space S2 in which the buffer section 20 is not provided. Therefore, unlike the first inner space S1, the second inner space S2 is not divided into two areas, an area on the opening side and an area on the bottom side relative to the buffer section 20, but rather forms a continuous space between the opening side and the bottom side. By dividing the second inner space S2 into a space separate from the second inner space S2 by the inner surface 50, an item 1′ (hereinafter referred to as “another item”) separate from the item 1 contained in the first inner space S1 can be contained in the second inner space S2. That is, while the item 1 to be protected by the buffer section 20 is contained in the first inner space S1, a separate item 1′ such as an invoice or instruction manual, which has a length or size that spans both the opening side and the bottom side, can be contained in the second inner space S2. This increases the convenience of the packaging bag.

[0080] (3A) The inner surface portion 50 has its peripheral edge, excluding the upper edge portion 510, adhered to the outer bag 10 without any gaps. This prevents the items 1, 1' from moving or leaking from either the first inner space S1 or the second inner space S2 separated by the inner surface portion 50 to the other. In this way, the storage capacity of the inner space S separated by the inner surface portion 50 can be improved. (4A) The flap 19 that opens and closes the opening 9 is provided to protrude upward from the second surface portion 12. That is, the flap 19 protrudes from the second surface portion 12 that partitions the second internal space S2, which is one of the first internal space S1 and the second internal space S2 and does not have the buffer portion 20. Therefore, when storing another item 1' such as an invoice or instruction manual, the flap 19 can be used as a guide to guide the other item 1' into the second internal space S2. In this way, the storage capacity of the second internal space S2 can be improved.

[0081] (5A) The second surface portion 12 is provided with a window 18 through which another item 1' stored in the second internal space S2 can be viewed from the outside, and the item 1' stored in the second internal space S2 can be viewed through the window 18. When a transparent or translucent material is attached to the window 18, it is possible to prevent the contamination of another item 1' stored in the second internal space S2 and also to prevent foreign matter from entering the second internal space S2, compared to a configuration in which a simple hole is provided as the window 18 (a so-called configuration in which the window is not attached). (6A) In addition, since the buffer portion 20 in the stretched state is arranged so as not to come into contact with the bottom 13 of the outer bag 10, contact (bottoming) between the item 1 placed in the packaging bag and the bottom 13 of the outer bag 10 is reduced, thereby improving the protection of the item 1.

[0082] [3-2. Packaging bag manufacturing method] (1B) According to the method for manufacturing a packaging bag according to this embodiment, a packaging bag that can achieve the functions and effects described in (1A) to (6A) above can be manufactured. Therefore, a highly convenient packaging bag can be manufactured.

[0083] Specifically, in the manufacturing method of this embodiment, the peripheral edge attachment region 510S of the inner sheet material 50S is attached to the second sheet piece 12S of the exterior sheet material 10S in the first bonding step. This first bonding step allows a second internal space such as an inner pocket to be partitioned and formed in the internal space S of the packaging bag. Furthermore, the second laminating step performed after the second laminating step is performed in a state in which the first sheet piece 11S is folded at the folding portion 16 and overlapped on the second sheet piece 12S via the inner sheet material 50S, and the folding portion 16 is disposed between the exterior attachment area 110S (one edge) of the first sheet piece 11S and the inner attachment area 520S (one edge) of the inner sheet material 50S. Therefore, the cushioning sheet material 20S can be laminated without being stretched, which contributes to improving the manufacturing efficiency of packaging bags.

[0084] (2B) According to the first bonding process, the entire peripheral bonding area 510S of the inner sheet material 50A can be bonded, so that a packaging bag can be manufactured in which the peripheral edge of the inner surface portion 50, except for the upper edge portion 510, is bonded to the outer bag 10 without any gaps.

[0085] (3B) In addition, in the flap preparation step of the first supply step, an exterior sheet material 10S is prepared in which a flap sheet piece 19S corresponding to the flap 19 is pre-protruded from one edge portion corresponding to the upper edge portion 120 of the second surface portion 12. Therefore, a packaging bag provided with the flap 19 can be manufactured without a separate step of adding or expanding the flap 19 to the exterior bag 10. (4B) In addition, in the window preparation step of the first supplying step, an exterior sheet material 10S is prepared in which holes corresponding to the windows 18 are pre-formed. Therefore, a packaging bag with a window 18 can be manufactured without a separate step of opening the window 18 in the exterior bag 10.

[0086] [II. Second Embodiment] Next, a packaging bag according to a second embodiment will be described. [1. Configuration] The packaging bag according to the second embodiment differs from the first embodiment in the configuration of the inner surface. However, except for the points described here, the second embodiment has the same configuration as the first embodiment. These components are denoted by the same reference numerals, and the description of each part will be omitted.

[0087] As shown in Figures 11 and 12, the packaging bag of this embodiment is provided with an inner surface portion 50' that is spaced above the bottom portion 13. Specifically, a lower edge 53' (other edge) of the inner surface portion 50' is spaced above the bottom portion 13. In other words, the vertical dimension (lengthwise dimension) of the inner surface portion 50' is set shorter than the vertical dimension of the internal space S. Therefore, the internal space S is in communication below the inner surface portion 50'.

[0088] The vertical dimension of the inner surface portion 50' exemplified in the second embodiment is set to be equal to or greater than the vertical dimension of the buffer section 20 folded in half in an unstretched state, as shown in Fig. 11. That is, the vertical dimension of the inner surface portion 50' is set to be the same as the vertical dimension of the buffer section 20. However, the vertical dimension of the inner surface portion 50' may be set to be longer than the vertical dimension of the buffer section 20. In other words, the inner surface portion 50' is set to be large enough to cover the buffer section 20 in an unstretched state when viewed from the direction in which the surface portions 11, 12 face each other.

[0089] 11 and 12, the buffer section 20 is suspended between the second surface section 12 and the inner surface section 50' (i.e., only in the area corresponding to the second internal space S2 in the first embodiment). Therefore, in the packaging bag exemplified here, an article 1 can be accommodated between the second surface section 12 and the inner surface section 50', and another article 1' can be accommodated between the first surface section 11 and the inner surface section 50', as shown in FIG.

[0090] Hereinafter, with reference to FIG. 13, a method for manufacturing a packaging bag according to the second embodiment will be described. First, as shown in Fig. 13(A), an exterior sheet material 10S and an inner sheet material 50S' that will become the inner surface portion 50' are supplied. At this time, a first supplying step of supplying the exterior sheet material 10S is carried out. Then, only the side edge portion 540S' of the inner sheet material 50S' is bonded to the first sheet piece 11S of the exterior sheet material 10S. At this time, a first bonding step is carried out in which the side edge portion 540S' of the inner sheet material 50S' is bonded to the first sheet piece 11S. Note that the "side edge portion 540S'" here refers to the edge portion of the inner sheet material 50S' in the X direction (horizontal direction).

[0091] Next, as shown in Fig. 13(B), the exterior sheet material 10S to which the inner sheet material 50S' has been attached is folded into a Z shape. Specifically, the exterior sheet material 10S is folded along the second horizontal line R so that the first sheet piece 11S faces the second sheet piece 12S. X2 After the first folding process is performed, the second horizontal crease R X2 The first sheet piece 11S is folded in the opposite direction to the folding direction along the third horizontal crease R X3 The second folding step is performed by folding the sheet along the second horizontal line R. X2 and the third horizontal ruled line R X3 A folding step is carried out in which the sheet is folded in opposite directions.

[0092] As a result, the Y2-side half of the second sheet piece 12S and the inner sheet piece 111S are arranged facing each other without the inner sheet material 50S' sandwiched between them. In this arrangement, the Y2-side half of the second sheet piece 12S, the inner sheet piece 111S, the outer sheet piece 112S, and the inner sheet material 50S are stacked in this order, and the bottom portion 13 and the fold portion 16 are formed.

[0093] In the second sheet piece 12S and the inner sheet material 50S' arranged in this manner, an exterior attachment area 120S (first edge area) is set at the Y1-direction edge (one edge portion) of the second sheet piece 12S, and an inner surface attachment area 510S (corresponding to the inner surface attachment area 520S described above in the first embodiment, first edge area) is set at the Y2-direction edge (one edge portion) of the inner sheet material 50S'. A fold 16 is arranged between the Y1-direction edge of the second sheet piece 12S where the exterior attachment area 120S is set and the Y2-direction edge of the inner sheet material 50S' where the inner surface attachment area 510S is set.

[0094] 13(C), the buffer sheet material 20S is supplied, at which time the second supplying step is carried out. Then, the buffer attachment areas 21S, 22S of the supplied buffer sheet material 20S are attached to the exterior attachment area 120S and the inner attachment area 510S, thereby completing the second attachment step of attaching the buffer sheet material 20S.

[0095] After this, the folding back process and bag making process are carried out as already described with reference to FIGS. 8(D) to 8(F) and 9 in the first embodiment. In addition, the folding back process of the second embodiment differs from the first embodiment in that the buffer sheet material 20S is interposed between the inner sheet material 50S' and the second sheet piece 12S, rather than between the inner sheet material 50S' and the first sheet piece 11S.

[0096] [2. Actions and Effects] The packaging bag according to the second embodiment, which includes the above-described inner surface portion 50', is provided with the inner surface portion 50 having a lower edge 53' (other edge) spaced above the bottom portion 13. Therefore, the inner space S is not completely partitioned by the inner surface portion 50', and the inner space S can be communicated below the inner surface portion 50' and above the bottom portion 13. This improves the capacity to store another item 1'.

[0097] Since the vertical dimensions of the inner surface portion 50' of the second embodiment are shorter than those of the inner surface portion 50 of the first embodiment, the amount of material used for the inner surface portion 50' can be reduced, making the packaging bag lighter and reducing material costs. Furthermore, because the vertical dimension of the inner surface portion 50' is set to be the same as the vertical dimension of the buffer portion 20, when the separate article 1' is inserted between the first surface portion 11 and the inner surface portion 50', it is possible to structurally prevent the separate article 1' from coming into contact with the buffer portion 20 in an unstretched state. If the inner surface portion 50' has a vertical dimension longer than that of the buffer portion 20, it is possible to reliably prevent the separate article 1' from coming into contact with the buffer portion 20 in an unstretched state. Therefore, it is possible to prevent damage to the buffer portion 20 due to contact with the separate article 1'.

[0098] According to the manufacturing method of the packaging bag according to the second embodiment, it is possible to manufacture the packaging bag according to the second embodiment that has the inner surface portion 50'. Therefore, it is possible to manufacture a highly convenient packaging bag. Specifically, in the manufacturing method of the second embodiment, only the side edge portion 540S' of the inner sheet material 50S' is bonded to the first sheet piece 11S of the exterior sheet material 10S in the first bonding step. This first bonding step makes it possible to form a continuous interior space S of the packaging bag without completely partitioning it.

[0099] [III. Third Embodiment] Next, a packaging bag according to a third embodiment will be described. [1. Configuration] The packaging bag according to the third embodiment has an inner surface with a shorter vertical dimension than that of the second embodiment. The configuration is the same as that of the first and second embodiments except for the points described here. The same reference numerals are used for these components, and the description of each component will be omitted.

[0100] The vertical dimension of the inner surface portion 50" exemplified in the third embodiment is set to be shorter than the vertical dimension of the buffer section 20 folded in half in an unstretched state, as shown in Figures 14 and 15. In other words, the vertical dimension of the inner surface portion 50" is set to be shorter than the vertical dimension of the buffer section 20. Therefore, the inner surface portion 50" is set to a size that allows the buffer section 20 in an unstretched state to protrude when viewed from the direction in which the surface portions 11 and 12 face each other. The manufacturing method of the packaging bag according to the third embodiment is the same as the manufacturing method of the packaging bag described above in the second embodiment, except that an inner sheet material 50S″ (a sheet material having a shorter Y-direction dimension than the inner sheet material 50S′ of the second embodiment) is used to form the inner surface portion 50″.

[0101] [2. Actions and Effects] The packaging bag according to the third embodiment is provided with an inner surface 50" having a shorter vertical dimension than the inner surface 50' of the second embodiment, so that the area below the inner surface 50" and above the bottom 13 that connects the internal space S can be expanded, thereby further increasing the capacity to store other items 1'. Since the vertical dimension of the inner surface portion 50" of the third embodiment is shorter than that of the inner surface portion 50' of the second embodiment, the amount of material used for the inner surface portion 50" can be further reduced, making the packaging bag even lighter and further reducing material costs.

[0102] [VI. Variations] The above-described embodiment is merely an example, and is not intended to exclude various modifications and application of techniques not explicitly stated in this embodiment. Each configuration of this embodiment can be modified and implemented in various ways without departing from the spirit of the invention. Furthermore, it is possible to select and combine as needed. In this section [VI], variations relating to the manufactured packaging bags and their sheet materials are described in section [1], and then variations relating to the manufacturing method of the packaging bags are described in section [2].

[0103] [1. Packaging bags, sheet materials] For example, the notched and non-notched portions of the buffer section are not limited to being oriented in the width direction, but may be oriented in at least a direction intersecting the suspension direction. Such an orientation allows the buffer section to stretch in the suspension direction. The outer bag is not limited to a gussetless envelope type with a flap, but various types of bags such as square bottom bags, gusseted bags, pillow bags, and standing pouches can be used, and bags with gussets or bags without flaps can also be used.

[0104] The inner surface portion in the first embodiment is not limited to a form in which the peripheral edge excluding the upper edge portion is bonded to the second surface portion without any gaps, as long as at least a portion of the peripheral edge excluding the upper edge portion is bonded to the outer bag. The flap is not limited to being provided so as to protrude from the second surface portion, but may be provided so as to protrude from the first surface portion. Note that the flap may be omitted from the packaging bag. The window is not limited to being provided on the second surface portion, but may be provided at any position on the outer bag, although the window may be omitted from the outer bag. The sheet material assembled into the packaging bag may also have a configuration corresponding to the modified example of the packaging bag described above.

[0105] [2. Packaging bag manufacturing method] For example, the first supply process is not limited to a process of preparing an exterior sheet material 10S having a flap sheet piece 19S corresponding to the flap 19 and a hole corresponding to the window 18 pre-formed therein, but may also include a process of preparing an exterior sheet material 10S that does not have a hole corresponding to the window 18 or a flap sheet piece 19S pre-formed therein.

[0106] For example, as shown in Fig. 10, when a process for preparing an exterior sheet material 10S that does not have a hole corresponding to the window 18 (hereinafter referred to as the "windowless preparation process") is performed, a window-punching process (step A12') for drilling a hole corresponding to the window 18 is performed after the window-less preparation process (first supply process, step A10'). When a packaging bag in which a transparent or translucent material is attached to the window 18 is produced, a window-attaching process (step A14') for attaching a transparent or translucent material to the hole (window 18) drilled in the window-punching process is performed. After the window-punching process or the window-attaching process is performed, a first laminating process (step A20') is performed, and the other processes described above (steps A30', A40', A50', A60', A70') are similarly performed.

[0107] After the first laminating step is performed, the inner sheet material 50S is laminated to and overlaps the second sheet piece 12S, making it difficult to form a window 18 only in the second sheet piece 12S without perforating the inner sheet material 50S. Therefore, the window punching step and window bonding step are performed before the first laminating step. By setting the order in which the window punching step and window bonding step are performed before lamination in the first laminating step in this way, a packaging bag with a window 18 can be easily manufactured.

[0108] Furthermore, when a process for preparing an exterior sheet material 10S without a flap sheet piece 19S (hereinafter referred to as the "no-flap preparation process") is performed, the no-flap preparation process (first supply process, step A10') is followed by a third laminating process (step A11') in which the flap sheet piece 19S is bonded to the second sheet piece 12S of the exterior sheet material 10S so that the flap sheet piece 19S extends from one edge of the second sheet piece 12S. While FIG. 10 shows an example in which this third laminating process is performed after the first supply process and before the window-punching process, it can be performed at any timing as long as the flap sheet piece 19S is bonded to the surface of the second sheet piece 12S that faces outward in the packaging bag. According to this no-flap preparation process and third laminating process, simply adding the preparation process and the third laminating process to a production line for packaging bags without flaps 19 allows the production line to be converted into a production line for packaging bags with flaps 19.

[0109] The manufacturing method of the packaging bag according to the first embodiment may include at least a first laminating step, a second laminating step, and a folding back step. The second laminating step, which is included in this manufacturing method, may be performed in a state in which the first sheet piece is folded at the fold and overlapped on the second sheet piece with the inner sheet material interposed therebetween, and the first sheet piece is disposed between the exterior attachment area (one edge) of the first sheet piece and the inner attachment area (one edge) of the inner sheet material. [Explanation of symbols]

[0110] 1 Article (contents) 10 outer bag 10S exterior sheet material 11 First surface (one surface) 110 Upper edge (one edge) 110S Exterior attachment area (first edge area) 111 Inside 111S Inner sheet piece 112S outer sheet piece 11S First sheet piece 12 Second surface portion (other surface portion) 12S Second sheet piece 120 Upper edge (other edge) 13 Bottom 14,15 Side 18 Windows 19 Flap 20 Buffer section (first inner body) 20S buffer sheet material 21 First attachment end 21a top end 22 Second attachment end 22a top end 23 Main body 230 Broken line part 231 First body part 232 Second body part 23a Notch 23b Non-notched part 31~36 One side 40 buffer cells 41~46 Wall part 50,50′,50″ Inner surface (second inner body) 50S inner sheet material 510 Upper edge (one edge) 510S Peripheral attachment area 511 Inside 520S Inner surface attachment area (first edge area) 53′ Lower edge (other edge) 540S′ side edge 9 aperture 91 First opening 92 Second opening P1 first pattern P2 second pattern S interior space S1 First internal space S2 Second internal space

Claims

1. a bag-shaped outer bag having two opposing side surfaces, openings formed by one longitudinal edge portion of each of the side surfaces, and a bottom formed by the other longitudinal edge portion of each of the side surfaces, the bag-shaped outer bag being exposed to the outside; a sheet-like inner surface portion, the one longitudinal edge portion being provided at a position dividing the openings into a first opening which is a part adjacent to the one longitudinal edge portion of one of the openings, and a second opening which is a part adjacent to the one longitudinal edge portion of the other of the openings, the sheet-like inner surface portion dividing the inner space of the outer bag into a first internal space between the first opening and the bottom, and a second internal space between the second opening and the bottom; and a stretchable sheet-like buffer portion suspended only in the first internal space, the buffer portion having a plurality of slits provided in a staggered pattern and extending in a predetermined direction intersecting the suspension direction, a first laminating step of laminating a peripheral edge of a sheet-like inner sheet material that will become the inner portion, excluding the one end edge, to the other surface portion having the other one end edge of the sheet-like outer sheet material that will become the outer bag; a second lamination step in which, after the first lamination step has been performed, one of the surface portions having one of the one end edges of the exterior sheet material to which the peripheral edge of the inner sheet material has been laminated is folded at a fold along the horizontal direction and superimposed on the other surface portion via the inner sheet material, and the fold is disposed between the one end edge of one of the surface portions and the one end edge of the inner sheet material, and then laminating together first end edge regions set on the one end edge of one of the surface portions of the exterior sheet material and the one end edge of the inner sheet material, and second end edge regions set on both end edges in a direction intersecting the predetermined direction, without stretching the buffer sheet material serving as the buffer portion in a direction intersecting the predetermined direction; and a folding-back process, after the second laminating process is performed, in which the folded portion is returned to a flat state and the buffer sheet material is folded at the fold line portion along the predetermined direction, so that the buffer sheet material is interposed between the inner sheet material and one of the surface portions without being interposed between the inner sheet material and the other surface portion. A method for manufacturing a packaging bag.

2. In the first bonding step, the entire peripheral area of ​​the inner sheet material except for the one edge portion of the inner sheet material is bonded. The method for manufacturing a packaging bag according to claim 1 .

3. a bag-shaped outer bag having two opposing side portions, an opening formed by one longitudinal edge portion of each of the side portions, and a bottom formed by the other longitudinal edge portion of each of the side portions, the bag-shaped outer bag being exposed to the outside; one longitudinal edge portion being provided at a position dividing the opening into a first opening which is a part adjacent to the one longitudinal edge portion of one of the openings, and a second opening which is a part adjacent to the one longitudinal edge portion of the other of the openings; a sheet-like inner surface portion arranged in an internal space of the outer bag; and an extensible sheet-like buffer portion suspended between one of the side portions and the inner surface, the extensible sheet-like buffer portion having a plurality of slits arranged in a staggered pattern and extending in a predetermined direction intersecting the suspension direction, wherein the other longitudinal edge portion of the inner surface is provided at a distance from the bottom in the vertical direction, a first laminating step of laminating only a lateral side edge portion of a sheet-like inner sheet material that will become the inner surface portion to one of the surface portions having one of the one end edges of a sheet-like outer sheet material that will become the outer bag; a second lamination step in which, after the first lamination step has been performed, one of the surface portions having one of the one end edges of the exterior sheet material to which the side end edge of the inner sheet material has been laminated is folded at a folding portion along the lateral direction and superimposed on the other surface portion, and the folding portion is disposed between the one end edge of the other surface portion and the one end edge of the inner sheet material, and first end edge regions set on the one end edge of the other surface portion of the exterior sheet material and the one end edge of the inner sheet material are laminated together, without stretching the buffer sheet material serving as the buffer portion in a direction intersecting the predetermined direction; and a folding back process, after the second laminating process is performed, in which the folded portion is returned to a flat state and the buffer sheet material is folded at the fold line portion along the predetermined direction, so that the buffer sheet material is interposed between the inner sheet material and one of the surface portions without being interposed between the inner sheet material and one of the surface portions. A method for manufacturing a packaging bag.

4. A method for manufacturing a packaging bag in which a flap for opening and closing the opening is provided so as to protrude from the one end edge portion of the other surface portion, a flap preparation step of preparing the exterior sheet material in which a flap sheet piece corresponding to the flap is provided in advance from the one end edge of the other surface portion, The first bonding step is carried out after the preparation step is carried out. The method for manufacturing a packaging bag according to claim 1 or 3.

5. A method for manufacturing a packaging bag in which a flap for opening and closing the opening is provided so as to protrude from the one end edge portion of the other surface portion, a flap-free preparation step of preparing the exterior sheet material without a flap sheet piece corresponding to the flap; a third laminating step of laminating the flap sheet piece to the exterior sheet material prepared in the no-flap preparation step, and extending the flap sheet piece from the one edge portion of the other surface portion. The method for manufacturing a packaging bag according to claim 1 or 3.

6. A manufacturing method of a packaging bag in which a window through which an article in the internal space can be viewed from the outside is provided on the other surface, a window-formed preparation step of preparing the exterior sheet material having a hole formed in advance on the other surface thereof corresponding to the window, The first lamination step is carried out after the window preparation step is carried out. The method for manufacturing a packaging bag according to claim 1 or 3.

7. A manufacturing method of a packaging bag in which a window through which an article in the internal space can be viewed from the outside is provided on the other surface, a windowless preparation step of preparing the exterior sheet material without holes corresponding to the windows; a window-making step of drilling the holes corresponding to the windows in the other surface of the exterior sheet material prepared in the windowless preparation step, The first bonding step is carried out after the window opening step. The method for manufacturing a packaging bag according to claim 1 or 3.

8. A window pasting step is included in which a transparent or translucent material is pasted on the window after the window opening step and before the first pasting step. The method for manufacturing a packaging bag according to claim 7 .

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