Manufacturing method for packaging bags

Abstract

The manufacturing process for packaging bags will be simplified to reduce manufacturing effort and costs. [Solution] The method for manufacturing a packaging bag comprises: a sheet material supply step S1 of supplying integrally connected sheet material; a cut portion forming step S2 of forming a plurality of cut portions extending in a predetermined direction in a third sheet piece; a first folding step S3 of folding the third sheet piece toward the second sheet piece along a horizontal line located at the connection point with the second sheet piece so that it overlaps the second sheet piece; a second folding step S4 of folding the third sheet piece toward the third sheet piece toward a horizontal line existing within the third sheet piece at a position a predetermined distance from the horizontal line, in the opposite direction to the first folding step S3; and a third folding step S6 of folding the second sheet piece toward the first sheet piece along a horizontal line located at the connection point with the first sheet piece so that the third sheet piece is located between the first and second sheet pieces.

Description

[Technical Field]

[0001] This invention relates to a method for manufacturing packaging bags for packaging articles. [Background technology]

[0002] Conventionally, packaging bags have been developed that are lined with mat-like cushioning materials such as air cushions with multiple air chambers or foam cushions to protect the items being packaged.

[0003] Patent Document 1 discloses a method for making a bag in which an inner air cushion is attached to an outer bag. Patent Document 2 discloses a method for manufacturing a packaging bag in which an outer material that will form a bag-shaped outer body and an inner material that will form an inner body having staggered cuts are bonded together, a fold portion that has been previously provided on one side of the outer material is returned to a flat state, and the inner material is folded along a fold line in a predetermined direction, thereby interposing the inner material between the two sides of the outer material. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2004-026160 [Patent Document 2] Japanese Patent Publication No. 2019-099231 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] Conventional packaging bags disclosed in Patent Documents 1 and 2 require the preparation of two components, an outer outer material and an inner inner material, and the two components to be glued together, which increases the effort and cost of manufacturing.

[0006] This invention provides a method for manufacturing packaging bags that reduces manufacturing effort and costs by employing a simpler process compared to conventional methods. [Means for solving the problem]

[0007] The present invention is a method for manufacturing a packaging bag, comprising: a sheet material supply step of supplying a sheet material having a first sheet piece, a second sheet piece integrally connected to the first sheet piece, and a third sheet piece integrally connected to the second sheet piece; a notch forming step of forming a plurality of notches extending in a predetermined direction in the three sheet pieces; a first folding step of folding the third sheet piece toward the second sheet piece along a second fold line located at the connection point with the second sheet piece so that the third sheet piece with the plurality of notches formed thereon overlaps the second sheet piece; a second folding step of folding the third sheet piece toward the second sheet piece along a third fold line located within the third sheet piece at a position a predetermined distance from the second fold line in the opposite direction to the first folding step; and a third folding step of folding the second sheet piece toward the first sheet piece along a first fold line located at the connection point with the first sheet piece so that the third sheet piece folded in the second folding step is located between the first and second sheet pieces. [Effects of the Invention]

[0008] According to the present invention, a third sheet piece, which has a cut portion formed to become a cushioning portion upon completion, is integrally formed with the sheet material that is the material for the packaging bag. As a result, it is not necessary to prepare a separate cushioning component from the main bag when manufacturing the packaging bag, and the number of bending and bonding processes can be reduced, simplifying the manufacturing process of the packaging bag and reducing manufacturing effort and costs. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a perspective view of a packaging bag according to one embodiment, showing the packaging bag in its unused state. [Figure 2] Figure 2 is a longitudinal cross-sectional view of Figure 1. [Figure 3] Figure 3 is a plan view showing an enlarged view of the main part of the buffer in its unstretched state. [Figure 4] Figure 4 is a longitudinal cross-sectional view showing the packaging bag in use. [Figure 5] Figure 5 is a magnified perspective view showing the main part of the cushioning section in its extended state. [Figure 6] Figure 6 is a cross-sectional view showing section AA of Figure 5. [Figure 7] Figure 7 is a plan view of a sheet material constituting a packaging bag according to one embodiment. [Figure 8A] Figure 8A is an explanatory diagram illustrating the sheet material supply process in a packaging bag manufacturing method according to one embodiment. [Figure 8B] Figure 8B is an explanatory diagram illustrating the process of forming a notch in the manufacturing method of a packaging bag. [Figure 8C] Figure 8C is an explanatory diagram illustrating the first and second folding steps in the manufacturing method of a packaging bag. [Figure 8D] Figure 8D is an explanatory diagram illustrating the application process in the manufacturing method of packaging bags. [Figure 8E] Figure 8E is an explanatory diagram illustrating the third folding step and the bonding step in the manufacturing method of a packaging bag. [Figure 8F] Figure 8F is an explanatory diagram illustrating the bag-making process in the manufacturing method of packaging bags. [Figure 9] This is a flowchart illustrating the steps of a method for manufacturing a packaging bag according to one embodiment. [Modes for carrying out the invention]

[0010] An embodiment of a method for manufacturing a packaging bag will be described with reference to the drawings. Note that the embodiment shown below is merely illustrative, and there is no intention to exclude various modifications or applications of techniques not explicitly shown in the embodiment below. Each component of this embodiment can be modified in various ways without departing from its spirit. Furthermore, components can be selected or combined as needed.

[0011] A packaging bag is a bag used to package articles. This embodiment describes a packaging bag in which a cushioning section is provided in the main bag to protect the articles being packaged. The main bag (outer body) and cushioning section (inner body) that make up this packaging bag can be formed from paper or cardboard such as kraft paper, fine paper, medium-quality paper, art paper, coated paper, cast coated paper, inkjet recording paper, Kurupack paper, liner, and white cardboard, laminated paper obtained by laminating a thermoplastic resin such as polyethylene resin to one or both sides of these papers, nonwoven fabrics such as spunbond and spunlace, and plastic sheets such as synthetic paper and film. It is particularly preferable to use kraft paper or Kurupack paper.

[0012] The main bag and the cushioning section are basically made from the same material, such as paper or resin.

[0013] In this embodiment, the packaging bag to be manufactured is described first, followed by a description of the sheet material assembled into the packaging bag. Then, the manufacturing method for the packaging bag is described. The description of the packaging bag focuses on a packaging bag with its opening facing upwards. The direction of gravity is defined as downwards, and the opposite direction is defined as upwards.

[0014] The description of the sheet material refers to the sheet material in a state where it is placed on a horizontal surface. This sheet material will be described using the X direction (horizontal direction) and Y direction (vertical direction), which are mutually orthogonal in the horizontal direction. Each of the X and Y directions extends in two opposite directions. Therefore, for each of the X and Y directions, one direction will be indicated with the subscript "1" and the other with the subscript "2". For example, one direction of the X direction will be indicated as the X1 direction and the other as the X2 direction. Furthermore, the X direction is also the second direction described later, and the Y direction is also the first direction described later.

[0015] (Packaging bag composition) First, the main body bag 10 of the packaging bag 1 according to the embodiment will be described with reference to Figures 1 and 2. The main body bag 10 is provided in the form of a gussetless envelope with an opening 9 at the top that is opened and closed by a flap 19. Here, a square envelope is given as an example for the main body bag 10, but a long envelope, a Western-style envelope, or a non-standard envelope may also be used for the main body bag. The main body bag 10 is provided with a first surface 11 and a second surface 12 that face each other.

[0016] The first surface section 11 and the second surface section 12 are connected to each other by a bottom section 13 located below the opening 9 in the main bag 10, and by two side sections 14 and 15 erected to connect the bottom section 13 and the opening 9. The upper edge (one end edge) 110 of the first surface section 11 is located on one side of the opening 9 (upper right side in Figure 1), and the upper edge (one end edge) 120 of the second surface section 12 is located on the other side of the opening 9 (lower left side in Figure 1). The opening 9 is demarcated by the upper edge 110 of the first surface section 11 and the upper edge 120 of the second surface section 12. The bottom section 13 is formed by connecting the lower edge (other end edge) 130 of the first surface section 11 and the lower edge (other end edge) 140 of the second surface section 12.

[0017] Furthermore, the first surface portion 11 is provided with a series of flaps 19 that protrude upward.

[0018] Next, the cushioning section 20 of the packaging bag 1 will be described. The cushioning section 20 is also called cushion paper or honey paper, and is a sheet-like cushioning material with multiple notches 23a arranged in a staggered pattern. The cushioning section 20 is placed between the first surface 11 and the second surface 12, and is installed inside the main bag 10, and is suspended by being stretched between the upper edge 110 of the first surface 11 and the upper edge 120 of the second surface 12.

[0019] The buffer portion 20 comprises a first end portion 21 attached to the upper edge portion 110 of the first surface portion 11, a second end portion 22 connected to the upper edge portion 110 of the second surface portion 12, and a main body portion 23 provided inside the main body bag 10 in a suspended state between the first end portion 21 and the second end portion 22.

[0020] The first end portion 21 is attached to the inner surface 111 of the upper edge 110 of the first surface portion 11. On the other hand, the second end portion 22 is integrally connected to the upper edge 120 of the second surface portion 12 in a bent state.

[0021] The buffer portion 20 is folded in half along the main body portion 23 at a central fold line 230 in the suspension direction connecting the first end portion 21 and the second end portion 22. The main body portion 23 of the buffer portion 20, when folded in half in this way, is broadly divided into two parts, as shown in Figure 2: the first main body portion 231 on the first end portion 21 side and the second main body portion 232 on the second end portion 22 side, with the fold line 230 in between.

[0022] Furthermore, the main body 23 expands under the weight of item A (see Figure 4) placed in the packaging bag 1 through the opening 9. In other words, before item A is placed in the packaging bag 1 (when the packaging bag 1 is unused), the cushioning part 20 is in an unstretched state (hereinafter referred to as the "unstretched state"), and after item A is placed in the packaging bag 1 (when the packaging bag 1 is in use), the cushioning part 20 becomes stretched (hereinafter referred to as the "stretched state").

[0023] The structure that allows the buffer portion 20 to be extended is provided in the main body portion 23. The main body portion 23 in its unextended state will be described below, followed by the main body portion 23 in its extended state.

[0024] First, with reference to Figure 3, the main body 23 in its unextended state will be described. The main body 23 is formed by cutting out numerous notches 23a. These notches 23a are provided in at least the main body 23 of the buffer portion 20. The notches 23a extend in a direction perpendicular to the suspension direction (here, the vertical direction) (hereinafter referred to as the "width direction").

[0025] These notches 23a are arranged intermittently along the width direction. That is, between adjacent notches 23a in the width direction, there are unnotched portions 23b.

[0026] The widthwise dimension of the notched portion 23a is set to be larger than the widthwise dimension of the non-notched portion 23b. That is, 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.

[0027] Here, the arrangement in one row in which notched portions 23a and non-notched portions 23b are arranged alternately along the width direction is defined as the first pattern P1. The arrangement in another row in which notched portions 23a' and non-notched portions 23b' are arranged alternately along the width direction, offset by half a pitch from the notched portions 23a and non-notched portions 23b of the first pattern P1 is defined as the second pattern P2. These first pattern P1 and second pattern P2 are arranged alternately along the suspension direction.

[0028] More specifically, the widthwise center C of the notch 23a in the first pattern P1. a and the widthwise center C of the non-cut portion 23b' in the second pattern P2 b ′ and are arranged side by side along the suspension direction. Similarly, the widthwise center C of the non-cut portion 23b in the first pattern P1 b and the widthwise center C of the notch 23a' in the second pattern P2 a The ′ and are arranged in a line along the suspension direction.

[0029] A cushioning portion 20 having a main body portion 23 provided with such notches 23a, 23a' and non-notched portions 23b, 23b' is manufactured by rotating and cutting an uncut sheet material with a rotary die cutter having a blade portion (cutter) on its outer circumference shaped to correspond to the notches 23a, 23a'. Alternatively, the cushioning portion 20 is manufactured by pressing and cutting an uncut sheet material with a flat die cutter having a blade portion shaped to correspond to the notches 23a, 23a'.

[0030] With respect to the notched portion 23a of the first pattern P1, the sheet piece on one side in the suspension direction (upward in Figure 3) is broadly classified into a first piece 31, a second piece 32, and a third piece 33 depending on its position relative to the notched portion 23a' and the non-notched portion 23b' of the second pattern P2.

[0031] The first piece 31 is the portion sandwiched between one side of the cut portion 23a of the first pattern P1 in the width direction (the left side in Figure 3) and the other side of the cut portion 23a' of the second pattern P2 in the width direction (the right side in Figure 3). The second piece 32 is the portion sandwiched between the center of the cut portion 23a of the first pattern P1 in the width direction and the non-cut portion 23b' of the second pattern P2. The third piece 33 is the portion sandwiched between the other side of the cut portion 23a of the first pattern P1 in the width direction and one side of the cut portion 23a' of the second pattern P2 in the width direction.

[0032] Furthermore, the other sheet piece in the suspension direction relative to the notched portion 23a of the first pattern P1 is broadly divided into a fourth piece 34, a fifth piece 35, and a sixth piece 36, similar to the first piece 31, second piece 32, and third piece 33 described above.

[0033] The fourth piece 34 is sandwiched between one widthwise portion of the notch 23a of the first pattern P1 and the other widthwise portion 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-notched portion 23b' of the second pattern P2. The sixth piece 36 is sandwiched between the other widthwise portion of the notch 23a of the first pattern P1 and one widthwise portion of the notch 23a' of the second pattern P2.

[0034] Next, the main body 23 in the extended state will be described with reference to Figures 4, 5, and 6. As shown in Figure 4, the main body 23 in the extended state is extended in the suspension direction compared to the main body 23 in the non-extended state. In the main body 23 at this time, the first to sixth pieces 31 to 36 (see Figure 3) rise up from the suspension direction in the thickness direction of the first surface 11 and the second surface 12 (the thickness direction of the main body 23 in the non-extended state), and a three-dimensional buffer cell 40 is formed by the rising first to sixth pieces 36. In other words, a buffer cell 40 appears when the first to sixth pieces 36 arranged around a single cutout 23a rise up.

[0035] More specifically, as shown in Figure 5, the first wall portion 41 corresponding to the first piece portion 31, the second wall portion 42 corresponding to the second piece portion 32, the third wall portion 43 corresponding to the third piece portion 43, the fourth wall portion 44 corresponding to the fourth piece portion 34, the fifth wall portion 45 corresponding to the fifth piece portion 35, and the sixth wall portion 46 corresponding to the sixth piece portion 36 are erected in the buffer cell 40 so as to form the side walls of the hexagonal tube.

[0036] In the geometrically most extended state (hereinafter referred to as the "maximum extended state") within the limits that do not damage the main body 23, the first wall portion 41 and the fourth wall portion 44 are aligned along the same plane, while the third wall portion 43 and the sixth wall portion 46 are aligned along other planes opposite the first wall portion 41 and the fourth wall portion 44. Therefore, in the buffer cell 40 in the maximum extended state, the first wall portion 41 to the sixth wall portion 46 are erected to form the side walls of a rectangular tube.

[0037] As described above, the stretched main body portion 23, unlike the sheet-like shape of the main body portion 23 before stretching, takes on a thicker state (hereinafter referred to as "mat-like") than the sheet-like shape of the main body portion 23 before stretching. In this mat-like main body portion 23, which has a dimension in the thickness direction, a cushioning deformation allowance, i.e., a cushioning allowance, is formed. Thus, the shape of the main body portion 23 changes from a sheet-like shape to a mat-like shape when stretched. In principle, the main body portion 23 that has changed from a sheet-like shape to a mat-like shape will not revert to a sheet-like shape again, and the shape of the main body portion 23 changes irreversibly, only slightly restoring due to restoring force.

[0038] Furthermore, as shown in Figure 4, the cushioning portion 20 in its extended state is provided so as not to be in contact with the bottom 13 of the main bag 10. Specifically, it is provided so that the fold line portion 230 located at the lowest point of the cushioning portion 20 in its maximum extended state does not come into contact with the bottom 13 of the main bag 10. In other words, if the vertical dimension between the upper end 21a of the first end portion 21 of the cushioning portion 20 and the bottom 13 of the main bag 10 is "M1", and the vertical dimension between the upper end 21a and the fold line portion 230 in the cushioning portion 20 in its maximum extended state is "M2", then inequality 2 "M1 > M2" is satisfied.

[0039] Furthermore, it is preferable to set "M2" as large as possible while satisfying inequality 2, so as close to "M1" as possible. Conversely, as shown in Figure 2, the fold line portion 230 of the unstretched cushioning portion 20 is pre-positioned above the bottom 13 of the main bag 10 by a predetermined dimension "M3" so that the cushioning portion 20 in its maximum stretched state does not come into contact with the bottom 13 of the main bag 10. In other words, the cushioning portion 20 is formed to be short in anticipation of the stretching allowance.

[0040] Next, with reference to Figure 4, an example of setting the dimensions of the buffer portion 20 to realize the above non-contact structure will be described. If the number of rows of the first pattern P1 and the second pattern P2 in the buffer portion 20 is "N", and the vertical dimension of the first end portion 21 is "M4", then the approximate formula 3 "M2-M4≈(L1-L2)×(N / 4)" holds true.

[0041] The left-hand side of this approximation formula 3 represents the vertical dimension of the first main body 231 or the second main body 232 in the maximum extension state.

[0042] On the other hand, (L1-L2) on the right-hand side of approximation equation 3 represents the suspension direction dimension for each buffer cell 40 in the maximum extension state, that is, the suspension direction dimension of the first wall portion 41 and the fourth wall portion 44.

[0043] In addition, since the number of buffer cells 40 arranged in the suspension direction in the main body 23 is half (N / 2) of the number of rows of the first pattern P1 and the second pattern P2, (N / 4) in the right side of the approximate formula 3 represents the number of buffer cells 40 arranged in the suspension direction in the first main body 231 or the second main body 232.

[0044] Here, if the suspension direction dimensions of the second wall portion 42 and the fifth wall portion 45 extending in the width direction are ignored, the value obtained by multiplying the number (N / 4) of buffer cells 40 arranged in the suspension direction in the first main body 231 or the second main body 232 by the suspension direction dimension (L1 - L2) per buffer cell 40 in the maximum extension state (the right side of the approximate formula 3) can be said to approximate the vertical dimension of the first main body 231 or the second main body 232 in the maximum extension state.

[0045] Therefore, by appropriately setting the parameters corresponding to each term in the approximate formula 3, such as the width direction dimensions L1 and L2 of the cut portion 23a or the non - cut portion 23b, the number of rows of the first pattern P1 and the second pattern P2, and the vertical dimension M4 of the first end portion 21 and the second end portion 22, the above non - contact structure can be designed.

[0046] (Configuration of the sheet material) Next, referring to FIG. 7, a sheet material which is a material assembled into the above - mentioned packaging bag 1 will be described. As shown in FIG. 7, the sheet material 10S includes a first sheet piece 11S corresponding to the first surface portion 11, a second sheet piece 12S connected to the first sheet piece 11S and corresponding to the second surface portion 12, and a third sheet piece 20S connected to the second sheet piece 12S and corresponding to the buffer portion 20.

[0047] Four horizontal grid lines R extending in the X direction X0 , R X1 , R X2 , R X3 are provided side by side in the Y direction, and two horizontal grid lines R X1 , R X2 divide the sheet material 10S into the first sheet piece 11S, the second sheet piece 12S, and the third sheet piece 20S respectively. The horizontal grid lines R X0 , R X1 , R X2, R X3 These are arranged in this order toward the Y2 direction. That is, horizontal line R X0 Horizontal ruled lines R X1 It is positioned on the Y2 direction side, and the horizontal ruled line R X1 Horizontal ruled lines R X2 It is positioned on the Y2 direction side, and the horizontal ruled line R X2 Horizontal ruled lines R X3 These are positioned on the Y2 direction side. These horizontal lines may actually be invisible virtual battle lines, or they may be fold lines corresponding to creases, as will be described later.

[0048] Four horizontal lines R X0 , R X1 , R X2 , R X3 Among them, horizontal ruled line R X0 This is a folding curve, i.e., a sealing fold, for folding the flap sheet piece 19S corresponding to the flap 19 to seal the main bag 10, and is not folded in the manufacturing process of the packaging bag 1. X1 , R X2 , R X3 Their personalities are different.

[0049] Horizontal ruled line R X1 This line is located at the point where the first sheet piece 11S and the second sheet piece 12S are connected. In the manufacturing process of the packaging bag 1, the second sheet piece 12S is folded towards the first sheet piece 11S to form the first fold line, which is the point where the sheet material 10S is assembled into a bag.

[0050] Horizontal ruled line R X2 and horizontal ruled line R X3 This is a folding curve for positioning the third sheet piece 30S, corresponding to the cushioning portion 20, inside the main bag 10, which is composed of a first surface 11 corresponding to the first sheet piece 11S and a second surface 12 corresponding to the second sheet piece 12S, during the manufacturing process of the packaging bag 1. X2 This forms the second curved line, horizontal line R X3 This constitutes the third fold.

[0051] Sheet material 10S has horizontal ruled lines R X1 , horizontal ruled line R X2 , horizontal ruled line R X3 It is assembled into the main bag 10 by being folded, and after inserting item A through the opening 9 of the main bag 10, the horizontal ruled line R X0 The opening 9 is sealed by folding it. Note that horizontal ruled line R X1 This is the fold line corresponding to the bottom 13 of the main bag 10 (see Figures 1 and 2, the part facing the opening 9).

[0052] The first sheet piece 11S and the second sheet piece 12S have two vertical lines R extending in the Y direction. Y1 , R Y2 (Bending curves) are arranged in the X direction. Vertical ruled line R Y1 , R Y2 This is the first vertical ruled line R Y1 However, the other side is the second vertical line R Y2 It is positioned closer to the X1 direction than the other side. On the other hand, the third sheet piece 20S has two vertical lines R extending in the Y direction. Y3 , R Y4 (Bending curves) are arranged in the X direction. Vertical ruled line R Y3 , R Y4 This is the third vertical line R on one side. Y3 However, the other fourth vertical line R Y4 It is positioned closer to the X1 direction than the X1 direction.

[0053] Horizontal ruled line R X0 and horizontal ruled line R X1 And the first vertical ruled line R Y1 and the second vertical line R Y2 This forms a rectangular outline that demarcates the first sheet piece 11S corresponding to the first surface 11. On the Y-direction side with respect to the first sheet piece 11S, there is a horizontal ruled line R X0 A flap sheet piece 19S corresponding to the flap 19 is connected to the Y1 direction side via the horizontal ruled line R X1 A second sheet piece 12S corresponding to the second surface portion 12 is connected to the Y2 direction side via the second sheet piece 12.

[0054] Horizontal ruled line R X1 and horizontal ruled line R X2 And the first vertical ruled line R Y1and the second vertical line R Y2 This forms a rectangular outline that demarcates the second sheet piece 12S corresponding to the second surface 11. On the Y-direction side of the second sheet piece 12S, there is a horizontal ruled line R X2 A third sheet piece 20S corresponding to the buffer portion 20 is connected to the Y2 direction side via the .

[0055] An edge 17 is provided on the opposite side of the flap sheet piece 19S in the Y direction of the sheet material 10S. The edge 17 is the horizontal ruled line R in the Y direction of the third sheet piece 20S. X2 It is also the edge of the third sheet piece 20S on the opposite side of the (second folding curve). Therefore, horizontal ruled line R X2 and edge 17, and the third vertical ruled line R Y3 and the fourth vertical line R Y4 This has a rectangular outline that demarcates the third sheet piece 20S corresponding to the buffer portion 20.

[0056] Also, the first vertical ruled line R Y1 and the second vertical line R Y2 Dimension W between X1 (The width of the first sheet piece 11S and the second sheet piece 12S) is the third vertical ruled line R Y3 and the fourth vertical line R Y4 Dimension W between X2 (The width of the third sheet piece 20S) is greater than this.

[0057] The third sheet piece 30S has horizontal ruled lines R extending in the X direction (a predetermined direction). X3 However, it is located in the center of the third sheet piece 30S in the Y direction. This horizontal ruled line R X3 This is a folded curve corresponding to the folded line section 230.

[0058] Furthermore, the third sheet piece 20S has the aforementioned notches 23a arranged in a staggered pattern. Each notch 23a extends along the X direction. However, as shown in Figure 8A later, the sheet material 10S may also be provided without the notches 23a.

[0059] Furthermore, the third sheet piece 20S has horizontal ruled lines R X3On the Y1 side, a first main body sheet piece 231S corresponding to the first main body 231 is provided. Meanwhile, horizontal ruled line R X3 On the Y2 side, a second main body sheet piece 232S corresponding to the second main body portion 232 is provided.

[0060] The dimensions LL1 in the Y direction of the first sheet piece 11S, LL2 in the Y direction of the second sheet piece 12S, and LL3 in the Y direction of the third sheet piece 20S are set to be equal. In other words, the horizontal lines R in the main sheet material 10S X0 , horizontal ruled line R X1 , horizontal ruled line R X2 , and horizontal ruled lines R X3 The position in the Y direction is set such that dimensions LL1 to LL3 are equal to each other.

[0061] Furthermore, the adhesive sheet piece 18S has vertical ruled lines R on both the X1 direction side and the X2 direction side of the first sheet piece 11S. Y1 , R Y2 They are connected via a link. The adhesive sheet piece 18S has a sheet material 10S with horizontal lines R X1 It is attached to the surface of the second sheet piece 12S (corresponding to the outer surface of the second surface portion 12) that faces the second sheet piece 12S when it is folded.

[0062] In the third sheet piece 20S, the area adjacent to the edge 17 on the Y2 direction side is set as the first adhesive area 22S, and the horizontal ruled line R of the first sheet piece 11S X0 In the area adjacent to it, the sheet material 10S has horizontal ruled lines R X1 A second adhesive area 110S is provided to which the first adhesive area 22S is attached when the sheet is folded. The second adhesive area 110S is the area corresponding to the inner surface 111 of the upper edge 110 of the first surface 11 described above. In other words, the second adhesive area 110S is provided on the inner surface of the main bag 10, among the surfaces of the first sheet piece 11S and the second sheet piece 12S.

[0063] Of the sheet material 10S, the third sheet piece 20S is formed in the manufacturing process of the packaging bag 1 with horizontal lines R X2 and horizontal ruled line R X3By being folded in opposite directions, the third sheet piece 20S is folded so that it forms a Z shape when viewed from the X direction. In this Z-shaped folded state, the first main sheet piece 231S and the second main sheet piece 232S are placed on top of the second sheet piece 12S in that order.

[0064] Furthermore, with respect to the third sheet piece 20S folded in a Z-shape, the horizontal ruled line R of the third sheet piece 20S is located approximately in the center of the second sheet piece 12S in the Y direction. X3 The corresponding folded line portion 230 (see Figure 1) is located there. Also, the upper end 21a of the first end portion 21 of the buffer portion 20 is the horizontal ruled line R X0 It roughly matches.

[0065] With the third sheet piece 20S folded in a Z shape, the second sheet piece 12S is placed along the first vertical ruled line R Y1 When folded towards the first sheet piece 11S, the first adhesive area 22S of the third sheet piece 20S faces the second adhesive area 110S of the first sheet piece 11S and is attached to it.

[0066] (Instructions for using the packaging bag) Next, we will explain how to use the packaging bag 1. As shown in Figures 1 and 2, first open the flap 19 to open the opening 9 and then open the main bag 10.

[0067] Next, item A is placed in the packaging bag 1, and item A is placed or inserted into the main body 23 of the cushioning section 20. At this time, as shown in Figure 4, as the main body 23 of the cushioning section 20 extends in the suspension direction, the first pieces 31 to the sixth pieces 36 around the cut portion 23a rise up in the thickness direction of the first surface 11 and the second surface 12, and as shown in Figures 5 and 6, cushioning cells 40 appear in the main body 23. Then, the flap 19 is attached to the upper edge 120 of the second surface 12 of the main bag 10, and the packaging bag 1 is sealed. At this time, item A is surrounded by cushioning cells 40.

[0068] (Manufacturing method for packaging bags) Next, a method for manufacturing the packaging bag 1 will be described. As described above, when the buffer portion 20 of the unextended packaging bag 1 is extended by the article A, the buffer cells 40 rise and appear, and the packaging bag changes to a state where the cushioning function is exerted. Conversely, since the unextended buffer portion 20 is in the form of a sheet, compared with a packaging bag using a cushioning material provided with a cushioning deformation allowance such as an air cushion or a foam cushion, the bulkiness of the packaging bag when not in use can be suppressed.

[0069] Also, one sheet material 10S includes not only the first sheet piece 11S and the second sheet piece 12S, but also the third sheet piece 20S that becomes the buffer portion 20 during manufacturing. Therefore, according to the manufacturing method of the present embodiment, there is no need to separately prepare a member that becomes the buffer portion 20, and the packaging bag 1 can be manufactured by a simple process, reducing the labor and cost of manufacturing.

[0070] In the manufacturing method exemplified here, a sheet material 10S in the form of a single sheet cut out in advance is used as the main body bag 10 and the member that becomes the buffer portion 20. Hereinafter, referring to FIGS. 8A to 8F, the manufacturing method according to the present embodiment will be described step by step.

[0071] First, as shown in FIG. 8A, a sheet material 10S having a first sheet piece 11S, a second sheet piece 12S integrally connected to the first sheet piece 11S, and a third sheet piece 20S integrally connected to the second sheet piece 12S is supplied (sheet material supply step).

[0072] At this point, the horizontal grid lines R X0 , R X1 , R X2 , R X3 do not necessarily need to form respective folding lines. Although they are merely virtual lines, the horizontal grid lines R X0 , R X1 , R X2 , R X3 may be formed in the manner of making folds. The horizontal grid lines R X0 , R X1 , R X2 , R X3Regardless of whether or not they are present, the first sheet piece 11S, the second sheet piece 12S, and the third sheet piece 20S are arranged continuously in a predetermined first direction, which in this embodiment is the Y direction.

[0073] Next, as shown in Figure 8B, a plurality of notches 23a are formed in the third sheet piece 20S along a predetermined direction, in an embodiment, the X direction (a second direction perpendicular to the first direction) (notch formation step). The notches 23a can be formed using a rotary die cutter, a flat die cutter, etc. The plurality of notches 23a are arranged, for example, in a staggered pattern, as described above. The formation of the notches 23a may be performed simultaneously with the supply of the sheet material 10S shown in Figure 8A.

[0074] Next, as shown in Figure 8C, the third sheet piece 20S is folded into a Z shape (first folding step, second folding step). Specifically, first, the entire third sheet piece 20S is folded so that the third sheet piece 20S, which has multiple cuts 23a formed on it, overlaps the second sheet piece 12S, along the horizontal ruled line R located at the connection point with the second sheet piece 12S. X2 That is, fold it along the second fold line toward the second sheet piece 12S (first fold step). Furthermore, horizontal rule line R X2 At a predetermined distance from the third sheet piece 20S, the horizontal ruled line R X3 That is, along the third folding curve, the horizontal ruled line R of the third sheet piece 20S X2 The first folding step involves folding in the opposite direction (second folding step).

[0075] Horizontal ruled line R X3 (Third fold line) is the horizontal line R X2 It is set at a predetermined distance away from the horizontal ruled line R, but specifically, it is located midway between the third sheet piece 20S in the first direction (Y direction). That is, horizontal ruled line R X3The folded portion 230 of the cushioning portion 20, formed by folding along the (third fold line), is located in the middle of the third sheet piece 20S. Therefore, when the packaging bag 1 is completed, the first end 21 and the second end 22 of the cushioning portion 20 are at equal distances from the folded portion 230, ensuring sufficient space from the opening 9 to the folded portion 230, and allowing the item A to be held stably when placed through the opening 9.

[0076] Furthermore, the dimension LL2 of the second sheet piece 12S in the first direction and the dimension LL3 of the third sheet piece 20S in the first direction are equal (see Figure 7). Therefore, the horizontal rule line R of the third sheet piece 20S X3 After the folding process (second folding step), the horizontal ruled line R is formed in the first direction. X2 The edge 17 of the third sheet piece 20S, opposite to the (second folding curve), is the horizontal ruled line R X2 This will result in an overlap (see Figure 8D). Therefore, when the packaging bag 1 is completed, the positions of the first end 21 and the second end 22 of the cushioning portion 20 can be aligned, and the dimensions of the first main body portion 231 and the second main body portion 232 as seen from the fold line portion 230 of the cushioning portion 20 can be made equal, ensuring the dimensions up to the fold line portion 230 as seen from the opening 9, and allowing the item A to be held stably when it is placed in from the opening 9.

[0077] The second sheet piece 12S, the first main sheet piece 231S, and the second main sheet piece 232S are stacked in this order, and a fold line portion 230 is formed. The fold line portion 230 has a horizontal ruled line R in the first direction (Y direction). X1 and horizontal ruled line R X2 It is placed between them.

[0078] Next, as shown in Figure 8D, adhesive is applied to the first adhesive area 22S adjacent to the edge 17 of the third sheet piece 20S in the first direction using the adhesive application device 200 (application step). In this embodiment, adhesive is applied not only to the first adhesive area 22S but also to the adhesive margin sheet piece 18S of the first sheet piece 11S. Here, known adhesives and tacks (hereinafter abbreviated as "adhesive") can be used. Various application methods for the adhesive include application by spraying or brushing, application by printing, and application in tape form.

[0079] Next, as shown in Figure 8E, the horizontal ruled line R of the third sheet piece 20S X3 In the second bending step, the third sheet piece 20S, which has been folded, is positioned between the first sheet piece 11S and the second sheet piece 12S, by the horizontal ruled line R located at the connection point with the first sheet piece 11S. X1 That is, it is folded along the first fold line toward the first sheet piece 11S (third folding step).

[0080] Furthermore, the horizontal ruled line R of the second sheet piece 12S mentioned above X1 After the folding (third folding step) is performed, the adhesive applied to the first adhesive area 22S of the third sheet piece 20S is used to bond the first adhesive area 22S to the second adhesive area 110S on the inner surface of the first sheet piece 11S (bonding step). This allows the first sheet piece 11S and the third sheet piece 20S to be easily bonded together, and also forms the main bag 10 and the buffer portion 20.

[0081] The dimension LL1 of the first sheet piece 11S in the first direction (Y direction), the dimension LL2 of the second sheet piece 12S in the first direction, and the dimension LL3 of the third sheet piece 20S in the first direction are equal. Therefore, the horizontal rule line R of the second sheet piece 12S X1 After the folding (third folding step), the edge 17 and the horizontal ruled line R X2 (Second folding curve) is, in the first direction, horizontal line R X1 (The first folding curve) is on the opposite side of the horizontal ruled line R of the first sheet piece 1S. X0, in other words, it coincides with the sealing fold curve. As a result, when the packaging bag 1 is completed, the positions of the first end 21 and the second end 22 of the buffer portion 20 coincide with the position of the opening 0, so that the buffer portion 20 can be formed to be continuous from the opening 9.

[0082] Finally, as shown in Figure 8F, the adhesive sheet piece 18S is folded over the second sheet piece 12S and glued together, similar to the usual bag-making process, to form the sheet material 10S into a bag (bag-making process). This completes the packaging bag.

[0083] As described above, the first sheet piece 11S and the second sheet piece 12S have two vertical lines R extending in the Y direction. Y1 , R Y2 These are arranged in a second direction (X direction), and the dimension of the first sheet piece 11S in the second direction perpendicular to the first direction (Y direction) and the dimension (width) of the second sheet piece 12S in the second direction are W X1 They are equal. On the other hand, the vertical ruled line R of the third sheet piece 20S Y3 , R Y4 This is a vertical ruled line R Y1 , R Y2 It is located further inward in the second direction than the third sheet piece 20S. That is, the dimension (width) W of the third sheet piece 20S in the second direction. X2 This refers to the dimension W in the second direction of the first sheet piece 11S and the second sheet piece 12S. X1 It is set to be smaller. Because the dimensions of the third sheet piece 20S in the second direction are smaller than the dimensions of the first sheet piece 11S and the second sheet piece 12S in the second direction, the third sheet piece 20S, which forms the cushioning portion 20, can be smoothly positioned between the first sheet piece 11S and the second sheet piece 12S, which form the main bag 10.

[0084] Furthermore, the first bending process and the second bending process may be performed simultaneously, as shown in Figure 8C. This reduces the time required for the first and second bending processes.

[0085] Figure 9 is a flowchart showing each step of the manufacturing method described above. First, a sheet material supply step is performed in which sheet material 10S is supplied (step S1). Next, a cut portion forming step is performed in which a plurality of cut portions 23a are formed in the third sheet piece 20S (step S2). Next, the third sheet piece 20S is formed along a horizontal line R X2 A first folding step is performed in which the sheet is folded towards the second sheet piece 12S along the (second folding curve) (step S3). Furthermore, the horizontal ruled line R within the third sheet piece 20S is performed. X2 A second bending process is performed in which the third sheet piece 20S is bent in the opposite direction to the first bending process along the (third bending curve) (step S4).

[0086] Next, in the first direction (Y direction), an adhesive application step is performed in which adhesive is applied to the first adhesive area 22S adjacent to the edge 17 of the third sheet piece 20S (step S5). Then, the second sheet piece 12S is connected to the horizontal ruled line R located at the connection point with the first sheet piece 11S. X1 A third folding step is performed in which the first sheet piece 11S is folded along the (first folding curve) (step S6).

[0087] Furthermore, an adhesive bonding step is performed in which the first bonding area 22S and the first sheet piece 11S are bonded together with the adhesive applied in the bonding step (step S7). Finally, a bag-making step is performed in which the adhesive allowance sheet piece 18S is folded and glued onto the second sheet piece 12S to form a bag of sheet material 10S (step S8).

[0088] Let's reiterate the configuration of the packaging bag 1 according to this embodiment, from the perspective of its relationship to the sheet material 10S and the manufacturing method. The packaging bag 1 according to this embodiment comprises a main bag 10 having a first surface portion 11 and a second surface portion 12 facing each other, and a buffer portion 20 disposed between the first surface portion 11 and the second surface portion 12. An opening 9 is formed at the upper edge portions (one end edge portion) 110, 120 of the first surface portion 11 and the second surface portion 12, and a bottom portion 13 is formed at the lower edge portions (other end edge portion) 130, 140 of the first surface portion 11 and the second surface portion 12.

[0089] Here, the buffer portion 20 comprises a first end portion 21 attached to the inner surface of the upper edge portion 110 of the first surface portion 11, a second end portion 22 connected to the upper edge portion 120 of the second surface portion 12 in a bent state, and a main body portion 23 positioned in the space between the first surface portion 11 and the second surface portion 12, connecting the first end portion 21 and the second end portion 22, and having a plurality of notches 23a formed therein that extend along a predetermined direction.

[0090] Furthermore, the second end portion 22 of the buffer portion 20 is connected to the upper edge portion 120 of the second surface portion 12 in a folded state. In other words, the packaging bag 1 is composed of a single sheet material 10S as shown in Figure 7, with the first surface portion 11, the second surface portion 12, and the buffer portion 20 connected in that order, and is manufactured by processing the sheet material 10S.

[0091] According to the packaging bag 1 of this embodiment, the cushioning portion 20 with a notched portion 23a is integrally formed with the sheet material 10S, which is the material of the packaging bag 1. As a result, there is no need to prepare a separate component for the cushioning portion 20 from the main bag 10, and the number of bending and bonding processes can be reduced, making the manufacturing process simpler and providing a packaging bag 1 that reduces manufacturing effort and cost.

[0092] In this embodiment, the main body 23 of the buffer portion 20 has a first main body 231 located on the first end 21 side and a second main body 232 located on the second end 22 side, with the fold line portion 230 in between. By having the main body 23 of the buffer portion 20 have the first main body 231 and the second main body 232 with the fold line portion 230 in between, the dimensions up to the fold line portion 230 as seen from the opening 9 are secured, and when the article A is inserted from the opening 9, the article A can be held stably.

[0093] Furthermore, in this embodiment, the dimensions of the first main body portion 231 from the first end 21 to the folded line portion 230 are equal to the dimensions of the second main body portion 232 from the second end 22 to the folded line portion 230. This ensures that the dimensions of the first main body portion 231 and the second main body portion 232, with the folded line portion 230 in between, are equal, thereby securing the dimensions up to the folded line portion 230 as seen from the opening 9, and allowing the article A to be held stably when it is inserted through the opening 9.

[0094] Furthermore, in this embodiment, multiple notches 23a are arranged in a staggered pattern on the main body 23. This makes it easy to form multiple cushioning cells 40 that can protect article A when it is placed in the packaging bag 1.

[0095] Furthermore, the notched portion 23a and the non-notched portion 23b are not limited to being oriented in the width direction (X direction, second direction), but only need to be oriented in a direction that intersects with the suspension direction of the buffer portion 20. Such orientation allows the buffer portion 20 to be extended in the suspension direction.

[0096] The main bag 10 is not limited to an envelope type without a gusset and equipped with a flap 19; 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 may also be used. In this case, sheet material 10S with shapes corresponding to various types of bags is used.

[0097] The materials that can be used for sheet material 10S are not particularly limited, as long as they are sheet-like materials with sufficient strength to prevent damage during use. For example, the aforementioned paper, cardboard, nonwoven fabric, and plastic sheets can be used as sheet materials. Laminated materials (such as laminated paper and corrugated cardboard, in addition to the laminated materials mentioned above) can also be used as sheet materials. Among these, paper and cardboard are particularly suitable for use as sheet materials because it is easy to recycle waste paper. Kraft paper, Kurupack paper, and cardboard are especially preferable for use as sheet materials because of their excellent strength. The sheet material may have a coating layer on one or both sides for purposes such as providing water resistance, printability, or strength.

[0098] The adhesive does not necessarily have to be applied to the first adhesive area 22S and the adhesive margin sheet piece 18S simultaneously. The adhesive application area may also be the second adhesive area 110S, in addition to or instead of the first adhesive area 22S.

[0099] The third sheet piece 20S that forms the buffer portion 20 has a third folding curve (horizontal ruled line R) corresponding to the folding line portion 230. X3 In addition to the above, multiple fold lines may be provided. For example, if the third sheet piece 20S is folded in an accordion shape along three or more fold lines, a packaging bag 1 is manufactured in which the cushioning portion 20 is folded into four or more sections and suspended.

[0100] In the sheet material supply process shown in Figure 8A, sheet material 10S may be supplied that has been pre-cut into individual sheets. Alternatively, strip-shaped or roll-shaped material may be fed out, and the fed-out material may be cut to supply sheet material 10S. In this case, sheet material 10S can be manufactured continuously, further improving the manufacturing efficiency of the packaging bag 1.

[0101] Furthermore, in the manufacturing method of the packaging bag 1, a sealing adhesive portion such as double-sided tape, glassine tape, or gum arabic may be added to the flap sheet piece. When tape is used for the sealing adhesive portion, cutting this tape at the same time as the inner material can contribute to improving manufacturing efficiency.

[0102] Herein, the features of the embodiments of the packaging bag manufacturing method according to the present invention described above are briefly summarized and listed below in [1] to [9].

[0103] [1] A sheet material supply step of supplying a sheet material (sheet material 10S) having a first sheet piece (first sheet piece 11S), a second sheet piece (second sheet piece 12S) integrally connected to the first sheet piece, and a third sheet piece (third sheet piece 20S) integrally connected to the second sheet piece, A process of forming cuts in the three sheet pieces, in which a plurality of cuts (cuts 23a) extending in a predetermined direction are formed, The third sheet piece, on which the plurality of notches are formed, is placed on top of the second sheet piece, and the second folding curve (horizontal ruled line R) located at the connection point with the second sheet piece is used to connect the third sheet piece. X2 A first bending step involves folding the second sheet piece along the line, At a position a predetermined distance from the second folding curve, the third folding curve (horizontal ruled line R) exists within the third sheet piece. X3 A second bending step in which the third sheet piece is bent in the opposite direction to the first bending step along the line, The third sheet piece, which was folded in the second folding step, is positioned between the first sheet piece and the second sheet piece, and the second sheet piece is positioned at the connection point with the first sheet piece, along the first folding curve (horizontal ruled line R X1 A third bending step involves folding the first sheet piece toward the side along the line, A method for manufacturing packaging bags that include the following features.

[0104] According to the configuration described in [1] above, the third sheet piece, which has a cut portion formed to become a cushioning portion when completed, is integrally formed with the sheet material that is the material of the packaging bag. As a result, when manufacturing the packaging bag, it is not necessary to prepare a separate cushioning component from the main bag, and the number of bending and bonding processes can be reduced, simplifying the manufacturing process of the packaging bag and reducing the effort and cost of manufacturing.

[0105] [2] The first sheet piece, the second sheet piece, and the third sheet piece are arranged in the first direction (Y direction), The third folding curve is located midway through the third sheet piece in the first direction, [1] The method for manufacturing the packaging bag described above.

[0106] According to the configuration described in [2] above, the folded line of the buffer portion formed by bending at the third fold line in the second bending process is located in the middle of the third sheet piece. Therefore, the first and second ends of the buffer portion are at equal distances from the folded line, ensuring the distance from the opening to the folded line and allowing the item to be held stably when it is inserted through the opening.

[0107] [3] The dimensions of the second sheet piece in the first direction are equal to the dimensions of the third sheet piece in the first direction, After the second bending process is carried out, the edge (edge ​​17) of the third sheet piece on the side opposite to the second bending curve in the first direction overlaps with the second bending curve. [2] The method for manufacturing the packaging bag described above.

[0108] According to the configuration described in [3] above, in the first direction, the dimensions of the second sheet piece and the third sheet piece are equal, so after the second bending process, the edge of the third sheet piece on the opposite side of the second fold line overlaps with the second fold line. This aligns the positions of the first and second ends of the buffer section, and makes the dimensions of the first main body section as seen from the fold line of the buffer section equal to the dimensions of the second main body section, ensuring the dimensions from the opening to the fold line and allowing the item to be held stably when it is inserted through the opening.

[0109] [4] The dimensions of the first sheet piece in the first direction are equal to the dimensions of the second sheet piece in the first direction and the dimensions of the third sheet piece in the first direction. After the third folding step is performed, the edge and the second folding curve are aligned with the sealing folding curve (horizontal ruled line R) of the first sheet piece on the opposite side of the first folding curve in the first direction.X0 ) overlaps, [3] The method for manufacturing the packaging bag described above.

[0110] According to the configuration described in [4] above, in the first direction, the dimensions of the first sheet piece, the second sheet piece, and the third sheet piece are equal. Therefore, after the third bending process, the edge of the third sheet piece and the second fold line overlap with the sealing fold line of the first sheet piece. As a result, the positions of the first and second ends of the buffer portion coincide with the positions of the opening, allowing the buffer portion to be formed to be continuous with the opening.

[0111] [5] An application step of applying adhesive to a region adjacent to the edge in the first direction (first application region 22S), The process further comprises, after the third bending step, an adhesive step of bonding the region and the first sheet piece with the adhesive applied in the application step, [3] The method for manufacturing the packaging bag described above.

[0112] According to the configuration described in [5] above, the first sheet piece and the third sheet piece can be easily bonded together, and the main bag and the cushioning portion can be formed.

[0113] [6] The first sheet piece, the second sheet piece, and the third sheet piece are arranged in a first direction, The dimension of the first sheet piece in the second direction (X direction) perpendicular to the first direction is equal to the dimension of the second sheet piece in the second direction. The dimensions of the third sheet piece in the second direction are smaller than the dimensions of the first and second sheet pieces in the second direction. [1] The method for manufacturing the packaging bag described above.

[0114] According to the configuration described in [6] above, the dimensions of the third sheet piece in the second direction are smaller than the dimensions of the first and second sheet pieces in the second direction, so that the third sheet piece, which serves as a buffer, can be smoothly positioned between the first and second sheet pieces, which form the main bag.

[0115] [7] The first bending process and the second bending process are performed simultaneously. [1] The method for manufacturing the packaging bag described above.

[0116] According to the configuration described in [7] above, the time required for the first and second bending processes can be reduced.

[0117] [8] In the cut portion forming step, the plurality of cut portions are provided in a staggered pattern on the third sheet piece. [1] The method for manufacturing the packaging bag described above.

[0118] According to the configuration described in [8] above, multiple cushioning cells that can protect the article can be easily formed when the article is placed in a packaging bag.

[0119] [9] The third bending step is followed by a bag-making step of forming the sheet material into a bag, [1] The method for manufacturing the packaging bag described above.

[0120] According to the configuration described in [9] above, a packaging bag can be produced. [Explanation of Symbols]

[0121] 1 packaging bag 9 aperture 10 Main bag 10S sheet material 11 First side 11S First Sheet Piece 12 Second surface section 12S 2nd sheet piece 13 Bottom 17 Edge 18S Adhesive Sheet Piece 19 Flap 19S Flap Sheet Piece 20 Buffer section 20S Third Sheet Piece 21 First end 22 Second end 22S First application area (area) 23 Main body 23a Notch 23b Non-cut section 110 Upper edge (one edge) 120 Upper edge (one edge) 110S Second application area 130 Lower edge (other edge) 140 Lower edge (other edge) 230 Broken line part 231 First main body 232 Second Main Body A Goods R X0 Horizontal ruled lines (sealing fold curve) R X1 Horizontal ruled line (first curve) R X2 Horizontal ruled line (second curve) R X3 Horizontal ruled line (third curve)

Claims

1. A sheet material supply process for supplying a sheet material having a first sheet piece, a second sheet piece integrally connected to the first sheet piece, and a third sheet piece integrally connected to the second sheet piece, A process of forming a cut portion in the three sheet pieces, which involves forming a plurality of cut portions extending in a predetermined direction, A first folding step involves folding the third sheet piece, which has the plurality of notches formed thereon, along a second fold line located at the connection point with the second sheet piece, so that the third sheet piece overlaps the second sheet piece, A second bending step in which, at a position a predetermined distance from the second bending curve, the third sheet piece is bent in the opposite direction to the first bending step along the third bending curve present within the third sheet piece, A third bending step in which the second sheet piece is bent along a first fold line located at the connection point with the first sheet piece so that the third sheet piece bent in the second bending step is positioned between the first sheet piece and the second sheet piece, A method for manufacturing packaging bags that include the following features.

2. The first sheet piece, the second sheet piece, and the third sheet piece are arranged in a first direction, The third folding curve is located in the middle of the third sheet piece in the first direction, A method for manufacturing a packaging bag according to claim 1.

3. The dimensions of the second sheet piece in the first direction are equal to the dimensions of the third sheet piece in the first direction. After the second bending process is carried out, the edge of the third sheet piece on the side opposite to the second bending curve in the first direction overlaps with the second bending curve. A method for manufacturing a packaging bag according to claim 2.

4. The dimensions of the first sheet piece in the first direction are equal to the dimensions of the second sheet piece in the first direction and the dimensions of the third sheet piece in the first direction. After the third bending process is carried out, the edge and the second fold line overlap with the sealing fold line of the first sheet piece on the opposite side of the first fold line in the first direction. A method for manufacturing a packaging bag according to claim 3.

5. A step of applying adhesive to a region adjacent to the edge in the first direction, The process further comprises, after the third bending step, an adhesive step of bonding the region and the first sheet piece with the adhesive applied in the application step, A method for manufacturing a packaging bag according to claim 3.

6. The first sheet piece, the second sheet piece, and the third sheet piece are arranged in a first direction, The dimension of the first sheet piece in a second direction perpendicular to the first direction is equal to the dimension of the second sheet piece in the second direction. The dimensions of the third sheet piece in the second direction are smaller than the dimensions of the first and second sheet pieces in the second direction. A method for manufacturing a packaging bag according to claim 1.

7. The first bending process and the second bending process are performed simultaneously. A method for manufacturing a packaging bag according to claim 1.

8. In the process of forming the notches, the plurality of notches are provided in a staggered pattern on the third sheet piece. A method for manufacturing a packaging bag according to claim 1.

9. The third bending step is followed by a bag-making step of forming the sheet material into a bag. A method for manufacturing a packaging bag according to claim 1.

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