Packaging bags

Abstract

To provide a packaging bag that enables air to be easily filled into the space between the contained article and the inner surface of the packaging bag, and to easily maintain the function as a cushioning material.SOLUTION: A packaging bag 100 is formed of a bag-shaped film having an opening portion 11, a body portion 12, a bottom portion 13, and a pair of side edges 14a, 14b, and includes a cushioning body 1 functioning as a cushioning material when the interior of the body portion 12 is filled with air. The cushioning body 1 includes: a folded portion 112 having a peripheral edge of the opening portion 11 folded back inside the body portion 12; a linear adhesive portion 114 which adheres outer surfaces 113 opposing each other of the folded portion 112 and extends in a straight line from one side edge 14a of the cushioning body 1 to the other side edge 14b and is interrupted at a predetermined position; and an air supply hole 115 for supplying air to the interior of the body 12 of the cushioning body 1. The packaging bag 100 includes: a paper layer 2 covering the cushioning body 1; and an insertion opening 251 provided in the paper layer 2, which corresponds to the position in the cushioning body 1 where the air supply hole 115 is formed.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a packaging bag for protecting stored items with a cushioning material provided inside. [Background technology]

[0002] Conventionally, when packaging an item in a packaging bag, it has been common to place a cushioning material between the item and the inner wall of the packaging bag in order to cushion the item from external shocks during transportation (shock cushioning) and to prevent the item from moving up, down, left, and right inside the packaging box (sealing).The cushioning material is often separate from the packaging bag and has multiple components, which may require separate disposal after opening the package, which can be time-consuming.

[0003] Therefore, for example, Patent Document 1 discloses a packaging bag in which an outer bag and an inner bag are integrated together, and the space between the outer bag and the inner bag is filled with air to function as a cushioning material for the contained items. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2012-176770 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, with the packaging bag described in Patent Document 1, a dedicated device is required to fill the space between the outer bag and the inner bag with air and seal it, and it is expected that preparing such a device will be costly and operating it will be tedious.

[0006] An object of the present invention is to provide a packaging bag that makes it possible to easily fill the space between the contained item and the inner surface of the packaging bag with air, thereby easily maintaining its function as a cushioning material. [Means for solving the problem]

[0007] The packaging bag according to the present invention is a packaging bag comprising a cushioning body made of a bag-shaped film having an opening, a body, a bottom, and a pair of side edges, and which functions as a cushioning material when the inside of the body is filled with air, the cushioning body comprising a folded portion where the peripheral edge of the opening is folded back inwardly to the inside of the body, a linear adhesive portion where opposing outer surfaces of the folded portion are bonded together, extending in a straight line from one side edge of the cushioning body to the other side edge and interrupted at a predetermined position, and an air supply hole formed at the predetermined position for supplying air to the inside of the body of the cushioning body, the packaging bag having a paper layer covering the cushioning body, and an insertion port provided in the paper layer corresponding to the position where the air supply hole of the cushioning body is formed. Effect of the Invention

[0008] According to the present invention, an air supply hole is formed by bonding the opposing outer surfaces of the folded-over portions of the bag-shaped film together, leaving a portion uncovered, and when air is filled in through the air supply hole, the area around the air supply hole functions as a check valve, so that the filled air does not easily escape from the inside of the packaging bag, making it possible to achieve the above-mentioned shock absorption and airtightness at low cost and with little effort. [Brief description of the drawings]

[0009] [Figure 1] 1 is a perspective view of a packaging bag according to a first embodiment of the present invention. [Diagram 2] 1 is a developed plan view of a packaging bag according to a first embodiment of the present invention. [Diagram 3] 3A and 3B are cross-sectional views of the packaging bag according to the first embodiment of the present invention, where (a) is a cross-sectional view taken along the line IIIa-IIIa in FIG. 2, and (b) is a cross-sectional view taken along the line IIIb-IIIb in FIG. [Figure 4] FIG. 1 is a developed plan view of a packaging bag according to a first embodiment of the present invention, in the middle of assembly with a portion folded back. [Diagram 5]1A and 1B are cross-sectional views of a packaging bag according to a first embodiment of the present invention, where (a) is a cross-sectional view taken along the Va-Va direction in FIG. 1, and (b) is a cross-sectional view taken along the Vb-Vb direction in FIG. [Figure 6] This is a part of the cross-sectional view shown in Figure 3(a), and is a figure for explaining the internal pressure applied near the air supply hole of the cushioning of the packaging bag, where (a) shows the state in which a long, thin tube for filling air into the cushioning of the packaging bag is inserted into the air supply hole and air filling has begun, (b) shows the state in which air filling has been completed in the cushioning of the packaging bag, and (c) shows the state in which the long, thin tube has been removed from the cushioning of the packaging bag. [Figure 7] FIG. 4 is a developed plan view of a packaging bag according to a second embodiment of the present invention. [Figure 8] FIG. 11 is a developed plan view of a packaging bag according to a third embodiment of the present invention. [Figure 9] 1. FIG. 4 is a cross-sectional view of a packaging bag according to a third embodiment of the present invention, taken along the Va-Va direction in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the embodiment.

[0011] First Embodiment <Structure> Fig. 1 is a perspective view of a packaging bag 100 according to a first embodiment of the present invention, Fig. 2 is a developed plan view of the packaging bag 100 according to this embodiment, and Fig. 3 is a cross-sectional view of the packaging bag 100 according to this embodiment, Fig. 3(a) is a cross-sectional view in the IIIa-IIIa direction of Fig. 2, and Fig. 3(b) is a cross-sectional view in the IIIb-IIIb direction of Fig. 2. For convenience of explanation, in Fig. 3 and Figs. 5 and 6 described below, the thickness of the cushioning body 1 is represented by a single line.

[0012] The packaging bag 100 of the present invention is capable of containing an item 3 such as a small item (e.g., a wristwatch, represented in the figure as an elliptical cylinder) inside, and is equipped with a bag-shaped film having a space between the contained item 3 and the inner wall of the packaging bag 100 that can be filled with air.

[0013] As shown in Figures 1 and 2, the packaging bag 100 of this embodiment is composed of a cushioning body 1 made of a bag-shaped film having an opening 11, a body 12, a bottom 13, and a pair of side edges 14a, 14b, and a paper layer 2.

[0014] The cushioning body 1 functions as a cushioning material when air is filled inside the body 12. The cushioning body 1 and the paper layer 2 are bonded together at their opposing surfaces via an adhesive part 4.

[0015] As shown in Fig. 2, two adhesive parts 4 are provided, one on the opening 11 side and one on the body 12 side, so as to extend linearly from one side edge 14a to the other side edge 14b of the cushioning body 1. In this embodiment, the adhesive parts 4 are linear, but the present invention is not limited to this and may be dot-like. In this embodiment, taking into consideration that the cushioning body 1 will be filled with air and will expand and change shape, it is preferable that the cushioning body 1 is adhered to the paper layer 2 via the two adhesive parts 4 with a little slack in the cushioning body 1 compared to the taut state of the paper layer 2.

[0016] As shown in Figures 1 and 2, the cushioning body 1 is provided with a folded portion 112 formed by folding back the peripheral portion of the opening 11 toward the inside of the body portion 12, a linear adhesive portion 114 which bonds opposing outer surfaces 113 of the folded portion 112 together and extends in a straight line from one side edge portion 14a to the other side edge portion 14b of the cushioning body 1 and terminates at a predetermined position, and an air supply hole 115 formed at a predetermined position for supplying air to the inside of the body portion 12 of the cushioning body 1.

[0017] At the bottom 13 of the cushioning body 1, the first layer (upper layer) and the second layer (lower layer) are continuous and are bonded by adhesive portion 141a so as to extend in a straight line along the left edge portion 14a, and are bonded by adhesive portion 141b so as to extend in a straight line along the right edge portion 14b, so that the cushioning body 1 is bag-shaped.

[0018] Furthermore, a first cut line C1a and a second cut line C1b are formed from the edge of the paper layer 2 toward the center so that the paper layer 2 is positioned at the position where the air supply hole 115 of the cushioning body 1 is formed, thereby providing an insertion hole 251 indicating the position of the air supply hole 115 into which a thin and long air supply tube S described below can be inserted. The position of this insertion hole 251 of the paper layer 2 is aligned with the position of the air supply hole 115 of the cushioning body 1 when or after bonding the cushioning body 1 to the paper layer 2 during the manufacturing process of the paper layer 2.

[0019] The cushioning body 1 is arranged and configured to surround the item 3 to be contained in the packaging bag 100, and the packaging bag 100 has one or more paper layers 2 that cover the cushioning body 1 arranged and configured to surround it.

[0020] As shown in Figures 1 and 2, the paper layer 2 has a first surface portion 21, a second surface portion 22, a third surface portion 23, a fourth surface portion 24, a fifth surface portion 25, a first left folding portion Fa, a second left folding portion Fd, a first right folding portion Fb, and a second right folding portion Fc.

[0021] The second surface portion 22 includes a first side surface portion 221 and a second side surface portion 222 , and the third surface portion 23 includes a third side surface portion 231 and a fourth side surface portion 232 .

[0022] The first left folding section Fa includes a first left surface section 21a, a second left surface section 221a, a third left surface section 222a, a fourth left surface section 231a, a fifth left surface section 232a, a sixth left surface section 24a, and a seventh left surface section 25a.

[0023] The second left folding portion Fd includes a sixth surface 26. In this embodiment, the second left folding portion Fd is configured by one surface of the sixth surface 26, but may have a similar configuration to the other folding portions.

[0024] The first right folding section Fb includes a first right surface section 21b, a second right surface section 221b, a third right surface section 222b, a fourth right surface section 231b, a fifth right surface section 232b, a sixth right surface section 24b, and a seventh right surface section 25b.

[0025] The second right side folding section Fc includes a first right side surface section 21c, a second right side surface section 221c, a third right side surface section 222c, a fourth right side surface section 231c, a fifth right side surface section 232c, a sixth right side surface section 24c, and a seventh right side surface section 25c.

[0026] The first surface portion 21 is connected to the first side surface portion 221 via a first line L1, and the first side surface portion 221 is connected to the second side surface portion 222 via a thirteenth line L13.

[0027] The first surface portion 21 is connected to the third side surface portion 231 via the second line L2, and the third side surface portion 231 is connected to the fourth side surface portion 232 via the twenty-fourth line L24.

[0028] The first surface portion 21 is connected to the first left surface portion 21a via a fifth line L5, and is connected to the first right surface portion 21b via a seventh line L7.

[0029] The first left surface portion 21a is connected to the sixth surface portion 26 via a sixth line L6, and the first right surface portion 21b is connected to the first right end surface portion 21c via an eighth line L8.

[0030] The fourth surface portion 24 is connected to the second side surface portion 222 via a third line L3, and the fifth surface portion 25 is connected to the fourth side surface portion 232 via a fourth line L4.

[0031] The first left surface portion 21a and the first side surface portion 221 are connected via the second left surface portion 221a, the first left surface portion 21a is connected to the second left surface portion 221a via the first left ruling line L1a, and the first side surface portion 221 is connected to the second left surface portion 221a via the 51st ruling line L51.

[0032] The second left surface portion 221a and the second side surface portion 222 are connected via the third left surface portion 222a, the second left surface portion 221a is connected to the third left surface portion 222a via the second left ruling line L13a, and the second side surface portion 222 is connected to the third left surface portion 222a via the 52nd ruling line L52.

[0033] The third left surface portion 222a and the fourth surface portion 24 are connected via the sixth left surface portion 24a, the third left surface portion 222a is connected to the sixth left surface portion 24a via the third left line L3a, and the fourth surface portion 24 is connected to the sixth left surface portion 24a via the fifty-third line L53.

[0034] The first left surface portion 21a and the third side surface portion 231 are connected via the fourth left surface portion 231a, the first left surface portion 21a is connected to the fourth left surface portion 231a via the fourth left ruling line L2a, and the third side surface portion 231 is connected to the fourth left surface portion 231a via the 54th ruling line L54.

[0035] The fourth left surface portion 231a and the fourth side surface portion 232 are connected via the fifth left surface portion 232a, the fourth left surface portion 231a is connected to the fifth left surface portion 232a via the fifth left ruling line L24a, and the fourth side surface portion 232 is connected to the fifth left surface portion 232a via the fifth left ruling line L55.

[0036] The fifth left surface portion 232a and the fifth surface portion 25 are connected via the seventh left surface portion 25a, the fifth left surface portion 232a is connected to the seventh left surface portion 25a via the sixth left line L4a, and the fifth surface portion 25 is connected to the seventh left surface portion 25a via the fifty-sixth line L56.

[0037] The first right surface portion 21b and the first side surface portion 221 are connected via the second right surface portion 221b, the first right surface portion 21b is connected to the second right surface portion 221b via the first right ruling line L1b, and the first side surface portion 221 is connected to the second right surface portion 221b via the 71st ruling line L71.

[0038] The second right surface portion 221b and the second side surface portion 222 are connected via the third right surface portion 222b, the second right surface portion 221b is connected to the third right surface portion 222b via the second right ruling line L13b, and the second side surface portion 222 is connected to the third right surface portion 222b via the 72nd ruling line L72.

[0039] The third right surface portion 222b and the fourth surface portion 24 are connected via the sixth right surface portion 24b, the third right surface portion 222b is connected to the sixth right surface portion 24b via the third right line L3b, and the fourth surface portion 24 is connected to the sixth right surface portion 24b via the seventy-third line L73.

[0040] The first right surface portion 21b and the third side surface portion 231 are connected via the fourth right surface portion 231b, the first right surface portion 21b is connected to the fourth right surface portion 231b via the fourth right ruling line L2b, and the third side surface portion 231 is connected to the fourth right surface portion 231b via the 74th ruling line L74.

[0041] The fourth right surface portion 231b and the fourth side surface portion 232 are connected via the fifth right surface portion 232b, the fourth right surface portion 231b is connected to the fifth right surface portion 232b via the fifth right ruling line L24b, and the fourth side surface portion 232 is connected to the fifth right surface portion 232b via the seventy-fifth ruling line L75.

[0042] The fifth right surface portion 232b and the fifth surface portion 25 are connected via the seventh right surface portion 25b, the fifth right surface portion 232b is connected to the seventh right surface portion 25b via the sixth right line L4b, and the fifth surface portion 25 is connected to the seventh right surface portion 25b via the 76th line L76.

[0043] The first right end surface portion 21c and the second right surface portion 221b are connected via the second right end surface portion 221c, the first right end surface portion 21c is connected to the second right end surface portion 221c via the first right end line L1c, and the second right surface portion 221b is connected to the second right end surface portion 221c via the 81st line L81.

[0044] The second right end surface portion 221c and the third right surface portion 222b are connected via the third right end surface portion 222c, the second right end surface portion 221c is connected to the third right end surface portion 222c via the second right end line L13c, and the third right surface portion 222b is connected to the third right end surface portion 222c via the 82nd line L82.

[0045] The third right end surface portion 222c and the sixth right surface portion 24b are connected via the sixth right end surface portion 24c, the third right end surface portion 222c is connected to the sixth right end surface portion 24c via the third right end line L3c, and the sixth right surface portion 24b is connected to the sixth right end surface portion 24c via the 83rd line L83.

[0046] The first right end surface portion 21c and the fourth right surface portion 231b are connected via the fourth right end surface portion 231c, the first right end surface portion 21c is connected to the fourth right end surface portion 231c via the fourth right end line L2c, and the fourth right surface portion 231b is connected to the fourth right end surface portion 231c via the 84th line L84.

[0047] The fourth right end surface portion 231c and the fifth right surface portion 232b are connected via the fifth right end surface portion 232c, the fourth right end surface portion 231c is connected to the fifth right end surface portion 232c via the fifth right end line L24c, and the fifth right surface portion 232b is connected to the fifth right end surface portion 232c via the fifth line L85.

[0048] The fifth right end surface portion 232c and the seventh right surface portion 25b are connected via the seventh right end surface portion 25c, the fifth right end surface portion 232c is connected to the seventh right end surface portion 25c via the sixth right end line L4c, and the seventh right surface portion 25b is connected to the seventh right end surface portion 25c via the eighth line L86.

[0049] The cushioning body 1 is made of a synthetic resin film. The cushioning body 1 is formed by welding two or more layers of film into a bag shape. As described above, the cushioning body 1 serves as a cushioning material for the packaging bag 100 by filling the inside of the body 12 of the cushioning body 1 with air. In this embodiment, the paper layer 2 is made of kraft paper. The kraft paper specified in JIS P 3401 can be used.

[0050] In order to obtain the effects of the present invention, the basis weight of the kraft paper is preferably 50 g / m 2 More than 150g / m 2 More preferably, the basis weight is 70 g / m 2 That's all.

[0051] The paper layer 2 is not limited to the kraft paper of this embodiment, and a layer containing synthetic resin fibers may be further laminated on the kraft paper.

[0052] In addition, the packaging bag according to this embodiment is approximately rectangular when viewed from above, but is not limited to this, and the packaging bag 100 may be any type of bag selected from the group of light packaging bags such as square bottom lined bags and hexagonal bottom lined bags, and heavy packaging bags made of kraft paper, etc.

[0053] <Flow of packaging bag production using a bag making machine> A bag making machine is used in the manufacturing process of the packaging bag according to this embodiment. The web-like paper layer 2 and film layer (the film that will become the cushioning body 1) supplied from rolls are overlapped as they flow, and the paper layer and film layer are glued or welded as necessary to form the bag material for the packaging bag.

[0054] The bag material in which each layer is overlapped has both ends inward in the flow direction and pasted together into a tube to form a folded portion 112, and the opposing outer surfaces 113 of the folded portion 112 are bonded together by linear adhesive portions 114. The both end edges are pasted together in a direction perpendicular to the flow direction and bonded by adhesive portions 141a and 141b, and then the bag material is cut into a tube of a certain length (one packaging bag 100).

[0055] As described above, air supply hole 115 having a check valve function is formed in folded-back portion 112. The inventors have devised a method for forming air supply hole 115 so that it can be incorporated into the manufacturing process of a normal heavy-duty packaging bag.

[0056] The inventor also discovered that, in order for the folded-back portion 112 and the air supply hole 115 to function as a check valve, the length of the folded-back portion 112 of the packaging bag 100 in the direction perpendicular to the flow direction (the left-right direction in FIG. 2) (i.e., the folded-back width of the folded-back portion 112 when the peripheral portion of the opening 11 is folded back to the inside of the body portion 12) is preferably 40 mm or more when the thickness of the film layer (plastic film) used in the cushioning body 1 is 50 μm. In addition, the inventor discovered that, considering that the air supply tube S is inserted into the air supply hole 115 using a long and thin air supply tube S to blow air into the cushioning body 1, or conversely, air is removed from the cushioning body 1 through the air supply tube S, the folded-back width of the folded-back portion 112 is preferably about 200 mm or less. The folded-back width of the folded-back portion 112 can be shorter than 40 mm when the film layer used in the cushioning body 1 is a thinner and more flexible plastic film.

[0057] The material for the film layer used in the cushioning body 1 can be any flexible, heat-processable resin, such as polyethylene, polypropylene (CPP, OPP, etc.), PET, polyamide, etc., which are used as packaging materials, and CPP, which is particularly flexible and has excellent heat processability, is preferably used.

[0058] <Packing Instructions> Fig. 4 is a developed plan view of the packaging bag 100 according to this embodiment, partly folded, during assembly, and Fig. 5 is a cross-sectional view of the packaging bag 100 according to this embodiment, Fig. 5(a) is a cross-sectional view taken along the Va-Va direction in Fig. 1, and Fig. 5(b) is a cross-sectional view taken along the Vb-Vb direction in Fig. 1. In Fig. 5, the dotted hatched portion represents filled air.

[0059] An item 3 is placed inside the bag-shaped film cushion 1, which is then folded back along the lines formed in the paper layer 2, folding the first left folding portion Fa, the second left folding portion Fd, the first right folding portion Fb, and the second right folding portion Fc, respectively. The ends created during folding are then sealed, and air is filled in through the air supply hole 115, resulting in a packaging bag as shown in FIG. 1.

[0060] Specifically, first, with the article 3 placed in the cushioning body 1, the first line L1, the first left line L1a, the first right line L1b, and the first right edge line L1c are folded in a valley shape, the thirteenth line L13, the second left line L13a, the second right line L13b, and the second right edge line L13c are folded in a mountain shape, and the third line L3, the third left line L3a, the third right line L3b, and the third right line L3c are folded in a mountain shape, so that gusset portions are formed on a pair of side portions of the paper layer 2, respectively. Valley-fold the third right edge ruled line L3c to obtain the first side surface portion 221, the second left side portion 221a, the second right side portion 221b, the second right side portion 221c, the second side surface portion 222, the third left side portion 222a, and the third right side portion 22. 2b, third right end surface portion 222c, fourth surface portion 24, sixth left surface portion 24a, sixth right surface portion 24b, and sixth right end surface portion 24c, and first surface portion 21, first left surface portion 21a, first right surface portion 21b, and and the first right end surface portion 21c, the second ruled line L2, the fourth left ruled line L2a, the fourth right ruled line L2b, and the fourth right end ruled line L2c are valley-folded, the 24th ruled line L24, the fifth left ruled line L24a, the fifth right ruled line L24b, and the fifth right end ruled line L24c are mountain-folded, and the fourth ruled line L4, the sixth left ruled line L4a, the sixth right ruled line L4b, and the sixth right end ruled line L4c are valley-folded to form the third side surface portion 231, the fourth left surface portion 231a, The fourth right surface portion 231b, the fourth right end surface portion 231c, the fourth side surface portion 232, the fifth left surface portion 232a, the fifth right surface portion 232b, the fifth right end surface portion 232c, as well as the fifth surface portion 25, the seventh left surface portion 25a, the seventh right surface portion 25b, and the seventh right end surface portion 25c are folded back relative to the first surface portion 21, the first left surface portion 21a, the first right surface portion 21b, and the first right end surface portion 21c to result in the state shown in Figure 4.

[0061] Next, the second right folding portion Fc is folded inward via the eighth line L8, the 81st line 81, the 82nd line 82, the 83rd line 83, the 84th line 84, the 85th line 85, and the 86th line 86, and further, the first right folding portion Fb is folded inward via the seventh line L7, the 71st line 71, the 72nd line 72, the 73rd line 73, the 74th line 74, the 75th line 75, and the 76th line 76, and fixed to the fourth surface portion 24 and the fifth surface portion 25 by fixing means (not shown, for example tape).

[0062] Then, the second left folding portion Fd is folded inward along the sixth line L6, and further, the first left folding portion Fa is folded inward along the fifth line L5, the fifty-first line 51, the fifty-second line 52, the fifty-third line 53, the fifty-fourth line 54, the fifty-fifth line 55, and the fifty-sixth line 56, and fixed to the fourth surface 24 and the fifth surface 25 by fixing means (not shown, for example tape).

[0063] Figure 6 is a part of the cross-sectional view shown in Figure 3(a) and is a figure for explaining the internal pressure applied near the air supply hole 115 of the cushioning 1 of the packaging bag 100, with Figure 6(a) showing the state in which a long, thin tube S for filling air A into the cushioning 1 of the packaging bag 100 has been inserted into the air supply hole 115 and filling with air A has begun, Figure 6(b) showing the state in which filling of air A into the cushioning 1 of the packaging bag 100 has been completed, and Figure 6(c) showing the state in which the long, thin tube S has been removed from the cushioning 1 of the packaging bag 100.

[0064] A long, thin tube (e.g., a straw) S is inserted into the air supply hole 115 (via the insertion port 251), and as shown in FIG. 6(a), the packer fills the cushioning body 1 with air A via the long, thin tube S. As shown in FIG. 6(b), when the inside of the cushioning body 1 is filled with air A, internal pressure P is applied to the long, thin tube S via the upper film 1u and lower film 1d near the air supply hole 115 of the cushioning body 1. As shown in FIG. 6(c), when the long, thin tube S is removed from the cushioning body 1 from the state shown in FIG. 6(b), a packaging bag 100 such as that shown in FIG. 1 is completed. As shown in Fig. 6(c), in this state, internal pressure P is applied to the upper film 1u and the lower film 1d near the air supply hole 115 through the film of the cushioning body 1 with respect to the elongated tube S, so that the upper film 1u and the lower film 1d do not open easily up and down, and the vicinity of the air supply hole 115 functions as a check valve, so that air A does not easily escape from inside the cushioning body 1, and the cushioning body 1 functions as a cushioning material. That is, as shown in Figs. 5(a) and 5(b), the article 3 contained in the packaging bag 100 is wrapped almost without gaps by the film layer of the cushioning body 1 which is filled with air A and expanded, and is suspended in the cushioning body 1, so that the contained article 3 is prevented from moving up, down, left and right in the packaging bag 100, and the article 3 can be stably held in the packaging bag 100.

[0065] Conventionally, when packaging an item in a packaging bag, it has been common to place cushioning material between the item and the inner wall of the packaging bag to absorb external shocks during transportation of the item (shock absorption) and to prevent the item from moving up, down, left, and right inside the packaging box (airtightness). However, the cushioning material is often separate from the packaging bag and consists of multiple components, which may require separate disposal after opening the package, which may be time-consuming. In light of this, for example, Patent Document 1 discloses a packaging bag in which an outer bag and an inner bag are integrated together, and the space between the outer bag and the inner bag is filled with air to function as a cushioning material for the contained item.

[0066] However, with the packaging bag described in Patent Document 1, a dedicated device is required to fill the space between the outer bag and the inner bag with air and seal it, and it is expected that preparing such a device will be costly and operating it will be tedious.

[0067] According to this embodiment, an air supply hole is formed by bonding the opposing outer surfaces of the folded-over portions of the bag-shaped film together, leaving a portion uncovered, and when air is filled in through the air supply hole, the area around the air supply hole functions as a check valve, so that the filled air does not easily escape from the inside of the packaging bag, making it possible to achieve the above-mentioned shock absorption and airtightness at low cost and with little effort.

[0068] Furthermore, the packaging bag described in Patent Document 1 is transparent, so the contents contained therein can be seen, but according to this embodiment, the cushioning body 1, which is a transparent bag-shaped film, is covered with an impermeable paper layer 2, making it possible to maintain the confidentiality and secrecy of the contained items.

[0069] Furthermore, when the packaging bag 100 of this embodiment is not in use, no air is allowed into the bag-shaped portion formed by the two synthetic resin films, so it can be stored without taking up too much space, just like a regular paper packaging bag.

[0070] In addition, the packaging bag 100 of this embodiment can be manufactured without making major changes to the known manufacturing process for heavy-duty packaging bags, and is manufactured without bonding the paper layer 2 and the synthetic resin film layer (the film layer of the cushioning body 1) entirely. Therefore, when disposing of the packaging bag 100 after use, the paper layer 2 and the synthetic resin film layer can be easily separated, which is also favorable in terms of recycling resources.

[0071] The bag described in Patent Document 1 is made of synthetic resin, and therefore when air is filled in, the entire bag swells outward and inevitably becomes spherical, which may make the package difficult to handle when storing or transporting it. However, in this embodiment, by providing a paper layer 2 as the outer layer, the shape of the packaging bag 100 after filling with air can be made box-like, and it is further possible to prevent the load from collapsing due to friction between the paper layers 2.

[0072] Specifically, the surface layer has a basis weight of 50 g / m 2 More than 150g / m 2 By using the paper layer 2 described below, the top and bottom surfaces of the packaging bag 100 are kept flat when air is blown into it, allowing efficient transportation and storage. The basis weight of the paper layer 2 is 70 g / m 2 More preferably, the above is used, and it is even more preferable to use craft paper, since it can prevent the packaging bags 100 from slipping against each other and causing the load to collapse. Also, it is even more preferable to use a glued bag such as a square bottom bag or a hexagonal bottom bag as the packaging bag 100, since the packaging bag 100 filled with the contents will have a more stable shape such as a box shape.

[0073] <Second embodiment> In the second embodiment of the present invention, unlike the first embodiment, opposing inner surfaces of the cushioning body 1' are sealed by a seal portion so that the bag-shaped film cushioning body 1' expands into a desired shape when air is supplied inside. Among the elements constituting the packaging bag 100' according to this embodiment, those having similar functions are given the same reference numerals as in the first embodiment, and their description will be omitted.

[0074] 7 is an exploded plan view of a packaging bag 100' according to this embodiment. In this embodiment, the cushioning body 1' further includes sealing parts that weld opposing surfaces of the cushioning body 1' together to define air chambers having a predetermined space. The sealing parts are provided in the cushioning body 1' to define two or more air chambers, and an air supply hole 115 is provided for each air chamber.

[0075] In this embodiment, as shown in FIG. 7, the seal portions 15a, 15b are provided in the cushioning body 1' so as to define three air chambers, and an air supply hole 115 is provided for each air chamber.

[0076] As shown in FIG. 7, the cushioning body 1' includes a folded portion 112 formed by folding back the peripheral portion of the opening 11 toward the inside of the body portion 12, a linear adhesive portion 114 formed by bonding opposing outer surfaces 113 of the folded portion 112 together and extending in a straight line from one side edge portion 14a to the other side edge portion 14b of the cushioning body 1' and interrupted at three predetermined positions, and air supply holes 115, 115a, 115b formed at three predetermined positions for supplying air to the inside of the cushioning body 1'.

[0077] In the bottom 13 of the cushioning body 1', the first layer (upper layer) and the second layer (lower layer) are continuous, and are bonded by the adhesive portion 141a so as to extend linearly along the left edge 14a, and are bonded by the adhesive portion 141b so as to extend linearly along the right edge 14b, as in the first embodiment, so that the cushioning body 1' is bag-shaped. In this embodiment, furthermore, the seal portions 15a and 15b are formed along the first direction from the opening 11 through the body portion 12 to the bottom 13, that is, the seal portion 15a extends substantially parallel to the extending direction of the adhesive portion 141a, and the seal portion 15b extends substantially parallel to the extending direction of the adhesive portion 141b, so that three bag portions are formed.

[0078] In addition, a first cut line C1a and a second cut line C1b, a third cut line C2a and a fourth cut line C2b, and a fifth cut line C3a and a sixth cut line C3b are formed from the edge of the paper layer 2 toward the center so that they are positioned at the positions where the air supply holes 115, 115a, 115b of the cushioning body 1' are formed, thereby providing three insertion openings 251, 252, 253 indicating the positions of the three air supply holes 115, 115a, 115b into which the elongated air supply tube S can respectively be inserted.

[0079] According to this embodiment, in addition to obtaining the same effect as the first embodiment, the opposing inner surfaces of the cushioning body 1', which is a bag-shaped film, can be sealed by a seal part so that the cushioning body 1' expands into a desired shape when air is supplied inside, so that various functions can be imparted to the packaging bag 100'. For example, by forming a plurality of air chambers as described above, it is possible to avoid losing the function as a cushioning material even if one bag is torn.

[0080] In this embodiment, two sealed portions are provided linearly on the cushioning body 1', but the present invention is not limited to this, and the sealed portions may be formed by welding in an interlocking comb-like pattern. Also, in this embodiment, three air supply holes are provided, but the present invention allows an embodiment in which there is only one air supply hole and a non-sealed portion is provided in part of the sealed portions 15a and 15b defining the air chambers so that air can be distributed throughout two or more air chambers when air is filled into the body 12 of the cushioning body 1' through the single air supply hole 115 (see the third embodiment below).

[0081] <Third embodiment> In the second embodiment of the present invention, the opposing inner sides of the cushioning body 1' are sealed together at two locations by the sealing parts 15a and 15b so that three bags are formed in the cushioning body 1' when air is supplied to the inside, and three air supply holes are provided in each bag. In the third embodiment, unlike the second embodiment, in addition to the sealing parts 15a and 15b, sealing parts 16 and 17a to 17f are provided to seal the opposing inner sides of the cushioning body 1'' along a direction perpendicular to the extending direction of the sealing parts 15a and 15b, so that a plurality of raft-shaped bags are formed in the cushioning body 1'' when air is supplied to the inside, thereby sealing in a vertical and horizontal lattice pattern, and one air supply hole is provided in the raft-shaped bag (see FIG. 8 described later). With this configuration, the air chambers of the raft-shaped bags formed in the cushioning body 1'' make it possible to prevent the air from being shifted to one side (see FIG. 9 described later). Sealed portion 15a, sealed portion 15b, sealed portion 16, and sealed portions 17a to 17f function as, so to speak, seals to prevent bulging. Of the various elements constituting packaging bag 100'' according to this embodiment, those having similar functions are given the same reference numerals as in the first and second embodiments, and descriptions thereof will be omitted.

[0082] FIG. 8 is a developed plan view of a packaging bag 100'' according to this embodiment. In this embodiment, in addition to the sealed parts 15a and 15b, the cushioning body 1'' further includes a sealed part 16 and sealed parts 17a to 17f that weld the opposing surfaces of the cushioning body 1'' in a vertical and horizontal lattice pattern so that three raft-shaped bag parts each having eight air chambers with a predetermined space are formed. That is, the sealed parts 15a, 15b, 16, and 17a to 17f are provided so that the air chambers have a raft shape when the body part 12 of the cushioning body 1'' is filled with air. In this embodiment, the cushioning body 1'' is provided with one air supply hole 115, and the arrangement of the air supply hole 115 is the same as in the first embodiment.

[0083] In this embodiment, as shown in Fig. 8, the seal portions 15a and 15b are each formed along a first direction extending from the opening 11 through the body portion 12 to the bottom portion 13, similarly to the second embodiment. Also, in this embodiment, as shown in Fig. 8, the linear seal portion 16 and seven seal portions 17a to 17f are each formed along a second direction perpendicular to the first direction (which may be a direction intersecting the first direction in the present invention).

[0084] In this embodiment, a non-sealed portion 18 that is not sealed is provided in a part of the sealed portion surrounding the air chamber so that air can be distributed throughout all 24 air chambers by supplying air into the cushioning body 1'' from one air supply hole 115 (the portion where the linear hatching indicating the sealed portion in FIG. 8 is interrupted). Specifically, as shown in FIG. 8, at least one non-sealed portion 18 is provided for one air chamber so that sealed portion 15a, sealed portion 15b, sealed portion 16, and sealed portions 17a to 17f extend linearly and are interrupted at a predetermined position. In other words, non-sealed portions 18 provided in sealed portion 15a, sealed portion 15b, sealed portion 16, and sealed portions 17a to 17f are provided so as not to be completely separated as air chambers so that they are inflated with air from one blowing port (air supply hole 115).

[0085] The seal portion 16 is formed by welding two opposing surfaces, namely, an inner surface of an inner portion of the folded portion 112 of the cushioning body 1″ (a portion indicated by reference symbol 1u in FIGS. 6(a) to 6(c)) and an inner surface of an inner portion of the folded portion facing the folded portion 112 of the opening 11 of the cushioning body 1″ (a portion indicated by reference symbol 1 in FIGS. 6(a) to 6(c) where the lead wire is in contact). On the other hand, the seal portions 15a, 15b and the seal portions 17a to 17f are formed by welding (e.g., sandwiching and heat sealing) all the film layers of the cushioning body 1″. In the case of four layers in the folded portion 112 and the folded portion, the four layers are welded, and in the case of two layers in the area other than the folded portion 112 and the folded portion, the two layers are welded.

[0086] As in the first embodiment, the cushioning body 1'' of this embodiment includes, as shown in FIG. 8, a folded portion 112 formed by folding back the peripheral portion of the opening 11 toward the inside of the body portion 12, a linear adhesive portion 114 which bonds opposing outer surfaces 113 of the folded portion 112 together and extends in a straight line from one side edge portion 14a to the other side edge portion 14b of the cushioning body 1 and terminates at a predetermined position, and an air supply hole 115 formed at a predetermined position for supplying air to the inside of the cushioning body 1''.

[0087] Furthermore, in this embodiment, similar to the first embodiment, a first cut line C1a and a second cut line C1b are formed from the edge of the paper layer 2 toward the center so that the cut lines are positioned at the positions where the air supply holes 115 of the cushioning body 1'' are formed, thereby providing insertion openings 251 indicating the positions of the air supply holes 115 into which the elongated air supply tubes S can each be inserted.

[0088] FIG. 9 is a cross-sectional view of the packaging bag 100″ according to this embodiment, taken along the Va-Va direction in FIG. 1. Referring to FIG. 9, it can be seen that when air is supplied from the air supply holes 115, there are 12 air chambers in the bag portion of the cushioning body 1″, and the arrangement of these air chambers forms a raft shape. In the unfolded packaging bag 100″ shown in FIG. 8, there are eight air chambers in the bag portion corresponding to the cross section, but when the packaging bag 100″ is folded back along the first line L1 to the fourth line L4 formed in the paper layer 2 and air is supplied to the cushioning body 1″, the first line L1 to the fourth line L4 function as boundaries that define the air chambers, so to speak, and the four air chambers become eight air chambers.

[0089] According to this embodiment, when air is supplied from the air supply hole 115, the item 3 contained in the packaging bag 100'' is wrapped by the film layer of the cushioning body 1'' which is filled with air A and expanded into a raft shape, as shown in Figure 9, and is suspended in the cushioning body 1, preventing the contained item 3 from moving up, down, left, or right within the packaging bag 100'', and allowing the item 3 to be held stably in the packaging bag 100''.

[0090] Furthermore, since the sealing portions are formed in a vertical and horizontal grid pattern in the cushioning body 1'', the amount of air filled in each air chamber is essentially determined, and as shown in Figure 9, when air is filled into the cushioning body 1'', each air chamber expands into an air mat-like shape with a relatively constant thickness. Compared to the first and second embodiments, this prevents the filled air in the cushioning body 1'' from becoming unevenly distributed, and makes it possible to more reliably protect the contained items 3 from external impacts. [Explanation of symbols]

[0091] 1 Buffer 2 paper layers 3 Goods 4 Adhesive part 11 Opening 12 Torso 13 Bottom 14 Side edge 14a Left edge 14b Right edge 15a, 15b Seal part 100 packaging bags 112 Folded part 113 External surface 114 Linear adhesive part 115 Air supply hole

Claims

1. A packaging bag is made of a bag-shaped film having an opening, a body, a bottom, and a pair of side edges, and is provided with a cushioning body that functions as a cushioning material when air is filled inside the body, The buffer body is a folded portion in which a peripheral portion of the opening is folded back toward the inside of the body portion; a linear adhesive portion that bonds opposing outer surfaces of the folded portion to each other, extends linearly from one side edge portion of the buffer body to the other side edge portion, and is interrupted at a predetermined position; an air supply hole formed at the predetermined position for supplying air to the inside of the body of the cushioning body; Equipped with The packaging bag has a paper layer covering the cushioning body, A packaging bag, characterized in that an insertion hole is provided in the paper layer so as to correspond to the position where the air supply hole of the cushioning body is formed.

2. The cushioning body is arranged to surround the article contained in the packaging bag, 2. The packaging bag according to claim 1, wherein the paper layer is one or more paper layers that cover the cushioning body arranged so as to surround the cushioning body.

3. The paper layer arranged at a position corresponding to a pair of side edges of the cushioning body has a pair of gusset portions, and a crease that allows mountain folds and valley folds is formed on the paper layer, The packaging bag according to claim 1, characterized in that the paper layer arranged at a position of the opening of the cushioning body corresponding to the folded-over portion and the bottom of the cushioning body has a line formed thereon for folding inward.

4. The packaging bag according to any one of claims 1 to 3, wherein the buffer body is made of a synthetic resin film.

5. The packaging bag according to claim 4, wherein the buffer body is formed by welding two or more layers of the film into a bag shape.

6. The packaging bag according to any one of claims 1 to 5, characterized in that the cushioning body functions as a cushioning material for the packaging bag by filling the inside of the body of the cushioning body with air.

7. 2. The packaging bag according to claim 1, wherein the paper layer is made of kraft paper.

8. The basis weight of the kraft paper is 50 g / m 2 Above, 150g / m 2 The packaging bag according to claim 7, characterized in that:

9. The basis weight of the kraft paper is 70 g / m 2 The packaging bag according to claim 8, characterized in that

10. 3. The packaging bag according to claim 2, wherein the packaging bag is any one of the following: a light-duty packaging bag having a square bottom, a light-duty packaging bag having a hexagonal bottom, and a heavy-duty packaging bag made of kraft paper.

11. The packaging bag according to any one of claims 1 to 10, further comprising a seal portion that welds opposing surfaces of the buffer body together so as to define an air chamber having a predetermined space.

12. The seal portion is provided in the cushioning body so as to define two or more air chambers, 12. The packaging bag according to claim 11, wherein the air supply hole is provided for each air chamber.

13. 13. The packaging bag according to claim 11 or 12, wherein the seal portion is formed by welding in a comb-like pattern in which two comb-shaped members intermesh with each other.

14. The packaging bag according to claim 11, characterized in that a non-sealed portion is provided in a part of the sealed portion that defines the air chamber so that air can be distributed throughout two or more air chambers when air is filled inside the body of the cushioning body through one of the air supply holes.

15. The packaging bag according to claim 14, wherein the seal portion is provided so that the air chamber has a raft shape when the inside of the body portion of the buffer body is filled with air.

16. 16. The packaging bag according to claim 1, wherein the folded-back portion has a folded-back width of 40 mm or more.

17. 17. The packaging bag according to claim 16, wherein the folded width of the folded portion is 200 mm or less.

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