Bag, bag bundle

Abstract

To provide a bag bundle in which transparency of each bag is improved.SOLUTION: A bag bundle of the present invention is a bag bundle in which bags capable of containing articles are bundled by a bag structure, and the bag comprises a sheet-like first bag portion, a sheet-like second bag portion disposed opposite the first bag portion and constituting the bag structure with the first bag portion and having an opening at a top end in a vertical direction, and a sheet-like extension portion extending further upward from the top end of the second bag portion and having perforations formed therein extending in a width direction thereof, and the first bag portion, the second bag portion, and the extension portion are formed from a sheet whose main component is low-density polyethylene, and when a length of a cut portion, which is a portion where the perforation is cut, is used as a reference, a length of an uncut portion, which is a portion where the perforation is not cut, is 3 / 5 or more of the length of the cut portion.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a bag, a bag bundle using the bag, etc. [Background technology]

[0002] For example, in fast food restaurants, when an ordered item includes accessories such as sauces or straws, the items are placed in a bag and served to the customer. A waiter separates a bag from a stack of such bags. Patent Document 1, for example, discloses an example of such a stack of bags, in which multiple bags for storing items are stacked. This stack of bags has an engagement hole near the center that can engage with an external member. To integrate the multiple bags, each bag has an extension piece extending upward, which connects the bags to each other. This stack of bags is held by being hooked onto a hook of a bag holding structure through the engagement hole. Perforations are formed in the extension piece of each bag, and when a bag is pulled from the stack, it separates from the stack via the perforation.

[0003] The type of bag bundle described in Patent Document 1 is made of high-density polyethylene. This is because high-density polyethylene has high rigidity, which allows the entire bag bundle to retain its shape well and makes it easy for workers to handle. Furthermore, the perforated portion of each bag in the bundle is significantly larger than the unperforated portion, with the perforated portion being 8 mm long and the unperforated portion being 1 mm long. This allows the bag to be separated from the bundle by pulling the bag with an appropriate amount of force. However, if the unperforated portion were longer than this, the bag would not be able to be separated from the bundle, even when pulled with the appropriate amount of force. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Utility Model Registration No. 3204195 Summary of the Invention [Problem to be solved by the invention]

[0005] The bundle of bags in Patent Document 1 is made of high-density polyethylene, so it is cloudy and translucent, making it difficult to check the contents inside the bags.

[0006] Furthermore, in Patent Document 1, in the case of a type of bag bundle in which the connecting portion is provided near both ends of the extension piece in the width direction, when the bag bundle bends, the position of the central engagement hole shifts, which causes a problem in that it is time-consuming to hook the bag bundle onto the hook of the bag holding structure through the engagement hole.

[0007] The present invention has been made in consideration of the above-mentioned circumstances, and aims to increase the transparency of each bag in a bag bundle, and to provide bags with increased transparency and a bag bundle made by bundling such bags. [Means for solving the problem]

[0008] The bag bundle of the present invention is a bag bundle formed by bundling bags capable of containing articles with a bag structure, the bags comprising: a sheet-like first bag portion; a sheet-like second bag portion disposed opposite the first bag portion and cooperating with the first bag portion to form the bag structure with an opening at the top end in the vertical direction; and a sheet-like extension portion extending further upward from the top end of the second bag portion and having perforations formed therein in the width direction, the first bag portion, the second bag portion, and the extension portion being formed from a sheet primarily composed of low-density polyethylene, and the length of the uncut portion, i.e., the length of the cut portion, i.e., the portion where the perforations are cut, is at least 3 / 5 of the length of the cut portion. In this case, the thickness of the sheet is preferably 10 μm to 30 μm, more preferably 15 μm to 25 μm, and even more preferably 15 μm to 20 μm.

[0009] In the bag bundle of the present invention, the length of the uncut portion is at least 2 / 3 of the length of the cut portion.

[0010] The bag bundle of the present invention is a bag bundle in which bags capable of containing articles are bundled together by a bag structure, the bags comprising: a sheet-like first bag portion; a sheet-like second bag portion arranged opposite the first bag portion and cooperating with the first bag portion to form the bag structure having an opening at the upper end in the vertical direction; and a sheet-like extension portion extending further upward from the upper end of the second bag portion and having perforations formed therein extending in the width direction of the second bag portion; the first bag portion, the second bag portion and the extension portion are formed from a sheet whose main component is low-density polyethylene, and the length of the uncut portion, which is the part of the perforation that is not cut, is 2 mm or more.

[0011] In the bag bundle of the present invention, the length of the cut portion, which is the portion where the perforation is cut, is 5 mm or less.

[0012] In the bag bundle of the present invention, when the upper end of the first bag portion in the vertical direction is separated from the second bag portion to open the opening, the maximum separation distance between the center of the width direction of the upper end of the second bag portion in the vertical direction and the center of the width direction of the upper end of the first bag portion in the vertical direction is 3 cm or more.

[0013] In the bag bundle of the present invention, the extension portion is characterized by having an engagement hole for hanging the bag above the perforation in the vertical direction, and a connecting portion near the engagement hole for connecting multiple stacked bags.

[0014] In the bag bundle of the present invention, the connecting portions are characterized by being arranged in pairs at positions that sandwich the engagement holes in at least one direction of the width direction, the vertical direction, and directions inclined toward both the width direction and the vertical direction.

[0015] In the bag bundle of the present invention, the extension portion is characterized by having an engagement hole for hanging the bag above the perforation in the vertical direction, a distal joining portion formed at a position far from the engagement hole for joining the plurality of stacked bags, and a proximal joining portion formed at a position close to the engagement hole for joining the plurality of stacked bags.

[0016] In the bag bundle of the present invention, the extension portion is formed with an engagement hole located above the perforation in the vertical direction for hanging the bag and a connecting portion for connecting multiple stacked bags, two of the engagement holes are formed in parallel in the width direction, and when the extension portion is divided into three equal parts in the width direction, one of the engagement holes is formed in one end region and the other of the engagement holes is formed in the other end region, and when the extension portion is divided into three regions in the width direction using two lines that pass through the centers of the one engagement hole and the other engagement hole and extend in the vertical direction as boundaries, at least one connecting portion is formed in each of the two regions located on both outer sides in the width direction.

[0017] In the bag bundle of the present invention, at least one of the joint portions is formed in a central region located in the center of the three regions.

[0018] In the bag bundle of the present invention, the connecting portions located in each of the three regions are formed at a position that passes through the centers of each of the two engagement holes and overlaps with an engagement hole center passing line that extends in the width direction, or are formed at a position shifted upward from the engagement hole center passing line and overlaps with a parallel line that is parallel to the engagement hole center passing line.

[0019] In the bag bundle of the present invention, the extension portion is formed with an engagement hole for hanging the bag above the perforation in the vertical direction, and a connecting portion for connecting multiple stacked bags, and two of the engagement holes are formed in parallel in the width direction, and when the extension portion is divided into three equal parts in the width direction, one of the engagement holes is formed in one end region and the other of the engagement holes is formed in the other end region, and when the extension portion is divided into three regions in the width direction using two lines that pass through the centers of one of the engagement holes and the other of the engagement holes and extend in the vertical direction as boundaries, two or more of the connecting portions are formed in each of the two regions located on both outer sides in the width direction.

[0020] The bag bundle of the present invention is a bag bundle in which bags capable of containing articles are bundled together by a bag structure, the bags comprising: a sheet-like first bag portion; a sheet-like second bag portion arranged opposite the first bag portion and cooperating with the first bag portion to form the bag structure having an opening at the upper end in the vertical direction; and a sheet-like extension portion extending further upward from the upper end of the second bag portion and having perforations formed therein extending in the width direction of the extension portion, the extension portion being characterized by having an engagement hole for hanging the bag above the perforations in the vertical direction, a distal joining portion formed at a position far from the engagement hole for joining multiple stacked bags, and a proximal joining portion formed at a position close to the engagement hole for joining multiple stacked bags.

[0021] The bag of the present invention is a bag that can contain items through its bag structure, and comprises a sheet-like first bag portion, a sheet-like second bag portion that is arranged opposite the first bag portion and cooperates with the first bag portion to form the bag structure having an opening at the upper end in the vertical direction, and a sheet-like extension portion that extends further upward from the upper end of the second bag portion and has perforations formed therein that extend in the width direction of the second bag portion, and is characterized in that the first bag portion, the second bag portion, and the extension portion are formed from a sheet whose main component is low-density polyethylene, and when the length of the cut portion, which is the portion where the perforations are cut, is used as a reference, the length of the uncut portion, which is the portion where the perforations are not cut, is 3 / 5 or more of the length of the cut portion. [Effects of the Invention]

[0022] According to the present invention, it is possible to provide bags and bag bundles with improved transparency. [Brief explanation of the drawings]

[0023] [Figure 1] 1A is a front view of a bag constituting a bag bundle according to an embodiment of the present invention, and FIG. 1B is a cross-sectional view (side cross-sectional view) taken along the line EE in FIG. [Figure 2] 1A is a side cross-sectional view of a bag bundle according to an embodiment of the present invention held by a holding structure. FIG. [Figure 3] 1A is a side cross-sectional view showing a bag bundle in which a plurality of bags are bundled together, and FIG. 1B and FIG. 1C are side views showing the overall configuration of a bag opening device. [Figure 4] 10(A) and 10(B) are plan views of modified examples of the bag bundle according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0024] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. The accompanying drawings are an example of an embodiment of the present invention, and in the drawings, parts with the same reference numerals represent the same objects. Furthermore, the shapes and dimensional ratios of each part in each drawing are not necessarily accurate.

[0025] <Overall structure> With reference to Figure 1, the overall structure of a bag 1 constituting a bag bundle in an embodiment of the present invention will be described. The bag 1 is for containing items, and as shown in Figures 1(A) and (B), it comprises a first bag portion 2, a second bag portion 3, an extension portion 4, and an overlapping portion 5. In the following description, the direction in which the second bag portion 3 and extension portion 4 of the bag 1 are aligned is defined as the vertical direction H (the opening side is upward and the bottom side is downward), and the direction perpendicular to this vertical direction H is defined as the width direction W of the bag 1. Note that this bag 1 refers to a state before being bundled or separated from the bag bundle. Furthermore, examples of items include accessories such as sauces and straws that come with products, but are not limited to these and include other items.

[0026] For example, the bag 1 may have a width (length in the width direction W) in the range of 160 to 180 mm and a length (length in the vertical direction H) in the range of 330 to 350 mm, but is not limited to these and may have other widths and lengths.

[0027] <First bag section> As shown in FIG. 1(B), the first bag portion 2 constitutes the front surface of the bag structure of the bag 1, which contains an item. The first bag portion 2 is made of, for example, a rectangular or square flexible sheet. The flexible sheet is made of low-density polyethylene (LDPE). Flexible sheets made of low-density polyethylene have higher transparency than high-density polyethylene (HDPE), allowing for high visibility of the contents of the bag 1 from the outside. On the other hand, low-density polyethylene has lower rigidity and tensile strength than high-density polyethylene. The flexible sheet may be made of a material whose main component is low-density polyethylene. The term "main component" refers to the component with the highest content in the material of the flexible sheet. In particular, the main component of the material of the flexible sheet preferably accounts for 50% by mass or more of all components constituting the material of the flexible sheet, more preferably 70% by mass or more, and even more preferably 90% by mass or more. Furthermore, materials containing low-density polyethylene as the main component also include materials that are entirely made of low-density polyethylene.

[0028] The length in the up-down direction H of the first bag portion 2 is preferably 200 mm or more and 400 mm or less, and preferably 250 mm to 300 mm. In this embodiment, it is 290 mm. The length in the width direction W of the first bag portion 2 is preferably 130 mm or more and 250 mm or less, and preferably 140 mm to 200 mm. In this embodiment, it is 168 mm. Furthermore, to increase the transparency of the bag 1, it is preferable that the thickness of the flexible sheet of the first bag portion 2 is as thin as possible. Therefore, the thickness of the flexible sheet of the first bag portion 2 is preferably 10 μm or more and 30 μm or less, more preferably 15 μm or more and 25 μm or less, and even more preferably 15 μm or more and 20 μm or less. In this embodiment, it is 18 μm. Note that, while increasing the thickness of the flexible sheet can increase the rigidity of the flexible sheet, doing so would decrease transparency and reduce the number of bags stacked in the bag bundle, reducing practicality. The above description of the flexible sheet also applies to the second bag portion 3 and the extension portion 4 described below.

[0029] <Second bag section> As shown in Figure 1(B), the second bag portion 3 constitutes the rear surface of the bag structure of bag 1. The second bag portion 3 is made of, for example, a rectangular or square flexible sheet having approximately the same shape and size as the first bag portion 2. The length in the up-down direction H, the length in the width direction W, and the thickness of the second bag portion 3 are the same as those of the first bag portion 2.

[0030] <Bag structure> The first bag portion 2 and the second bag portion 3 are connected to each other at their opposite edges in the width direction W or at their vicinity. The lower edge portions of the first bag portion 2 and the second bag portion 3 are also connected to each other or at their vicinity. As a result, a bag structure is formed by the first bag portion 2 and the second bag portion 3. The upper edge portions of the first bag portion 2 and the second bag portion 3 are not connected to each other, forming an opening 11 of the bag structure. The opening 11 extends to both ends of the width direction W of the first bag portion 2 and the second bag portion 3, which uniquely determines the position of the opening 11 in the up-down direction H.

[0031] The peripheries of the first bag portion 2 and the second bag portion 3 are welded (fused) to each other by applying heat to the cutter simultaneously with the cutting operation using a cutter to define the contours of the first bag portion 2 and the second bag portion 3. However, the manufacturing method is not limited to this, and they may be connected by other methods such as adhesion. Furthermore, it is sufficient that the edges of the first bag portion 2 and the second bag portion 3 at both ends in the width direction W or their vicinity, and the edges of the lower ends or their vicinity, are at least partially connected. From the viewpoint of preventing leakage of the liquid contained in the bag, it is desirable that they are completely connected.

[0032] <Extension part> As shown in FIGS. 1(A) and 1(B), the extension 4 extends further upward from the upper end of the second bag portion 3. The extension 4 is made of, for example, a rectangular or square flexible sheet having a length in the width direction W that is approximately the same as that of the second bag portion 3 and a length in the up-down direction H that is shorter than that of the second bag portion 3. The extension 4 and the second bag portion 3 may be made of a single flexible sheet, or may be made by joining separate independent flexible sheets. The length of the extension 4 in the up-down direction H is preferably 40 mm or more and 80 mm or less, and is desirably set to 45 mm to 60 mm. In this embodiment, it is 52 mm. The length and thickness of the extension 4 in the width direction W are the same as those of the first bag portion 2.

[0033] Perforations 40 extending in the width direction W are formed in the extension 4 midway in the up-down direction H. The perforations 40 have cut portions 40A, which are portions where the extension 4 is cut, and uncut portions 40B, which are portions where the extension 4 is not cut. The cut portions 40A and the uncut portions 40B are alternately arranged in the width direction W to form the perforations 40.

[0034] For example, if the length of cut portion 40A is longer than the length of uncut portion 40B, and there is a large difference in length between uncut portion 40B and cut portion 40A (e.g., if uncut portion 40B is 1 mm long and cut portion 40A is 8 mm long), and the thickness of the flexible sheet constituting extension portion 4 is thin (e.g., 10 μm or more and 20 or 30 μm or less), bag 1 may be more transparent, but even if an extremely lightweight item is placed in bag 1, the bag 1 may unintentionally separate at perforation 40 due to its own weight and fall. For this reason, it is preferable to increase the length of uncut portion 40B and reduce the difference in length between cut portion 40A and uncut portion 40B to prevent bag 1 from unintentionally separating at perforation 40. In the above example where uncut portion 40B is 1 mm long and cut portion 40A is 8 mm long, the length of uncut portion 40B is 1 / 8 the length of cut portion 40A. In other words, when the total length of one cut portion 40A and one uncut portion 40B is used as a standard, the length of the uncut portion 40B is 1 / 9 of the total length. This makes it easy for the bag 1 to unintentionally separate at the perforation 40, so the length of the uncut portion 40B is preferably 3 / 5 or more of the length of the cut portion 40A, more preferably 2 / 3 or more, and even more preferably 3 / 4 or more. Furthermore, when the total length of one cut portion 40A and one uncut portion 40B is used as a standard, the length of the uncut portion 40B is preferably 3 / 8 or more of the total length, more preferably 2 / 5 or more, and even more preferably 3 / 7 or more. However, the length of the uncut portion 40B is preferably equal to or shorter than the length of the cut portion 40A. To explain the above more specifically, for example, if the length of the cut portion 40A is 4 mm, the length of the uncut portion 40B is preferably 2 mm to 4 mm, more preferably 2.5 mm to 4 mm, and even more preferably 3 mm to 4 mm. Furthermore, to prevent bag 1 from unintentionally separating at perforation 40, the length of cut portion 40A is preferably 7 mm or less, more preferably 6 mm or less, and even more preferably 5 mm or less.

[0035] The extension portion 4 is separated by a perforation 40 into a proximal extension portion 4A that is closer to the opening 11 of the bag structure and a distal extension portion 4B that is farther from the opening 11. The proximal extension portion 4A is continuous with the upper end of the second bag portion 3 in the vertical direction H. The distal extension portion 4B is also continuous with the upper end of the proximal extension portion 4A. The length of the proximal extension portion 4A in the vertical direction H is shorter than that of the distal extension portion 4B. In this embodiment, the proximal extension portion 4A is 23 mm, and the distal extension portion 4B is 29 mm.

[0036] 1(A) and 1(B), an engagement hole 41 is provided in the distal extension portion 4B. For example, when a bag bundle 10, which is a bundle of a plurality of bags 1, is held by a bag holding structure 100 for suspending and holding the bag bundle 10, as shown in FIG. 2, an engagement rod 110 of the bag holding structure 100 is inserted into the engagement hole 41, whereby the bag bundle 10 is held by the bag holding structure 100 in a suspended state.

[0037] In this embodiment, two engagement holes 41 are formed in the distal extension 4B (region above the perforation 40). In this embodiment, the center C of each engagement hole 41 is preferably located in the vertical direction H between the center F1 of the distal extension 4B (a position 1 / 2 of the vertical length of the distal extension 4B starting from the upper end of the distal extension 4B) and a position F2 that is 2 / 3 of the vertical length of the distal extension 4B starting from the upper end of the distal extension 4B.

[0038] Here, the boundaries of the regions obtained by dividing the extension portion 4 into three equal parts in the width direction W are defined as a first boundary K1 and a second boundary K2, and the outer edge of the extension portion 4 in the width direction W that is closest to the first boundary K1 is defined as a first outer edge G1, and the outer edge of the extension portion 4 in the width direction W that is closest to the second boundary K2 is defined as a second outer edge G2. The center C of one engagement hole 41 is preferably located at a position shifted toward the first outer edge G1 in the width direction W from the first boundary K1. The center C of the other engagement hole 41 is preferably located at a position shifted toward the second outer edge G2 in the width direction W from the second boundary K2.

[0039] Furthermore, as shown in Figure 1(A), if the areas partitioned in the width direction W by the first boundary K1 and the second boundary K2 are defined as a first right end area, a first central area, and a first left end area, respectively, from right to left, it is preferable to provide at least one engagement hole 41 in each of the first right end area and the first left end area.

[0040] As already mentioned, low-density polyethylene has low rigidity, so the bag bundle 10 shown in Fig. 2 has extremely low overall rigidity and is soft. Therefore, if an engagement hole were provided in the first central region and the engagement rod 110 were suspended only by this engagement hole, the first right end region and the first left end region would bend, making it difficult to maintain the rectangular shape of the bag bundle 10. Therefore, as in this embodiment, the bag bundle 10 is held by a pair of engagement holes 41 located at both upper corners, making it possible to maintain the rectangular shape of the bag bundle 10.

[0041] <Overlapping section> The overlapping portion 5 is continuous with the first bag portion 2 at its upper end and overlaps the upper end band-like region 25 of the first bag portion 2 inside the bag structure (region R between the first bag portion 2 and the second bag portion 3: see Figure 1(B)). The upper end band-like region 25 is a band-like region of the first bag portion 2 that starts from the upper end of the first bag portion 2. The overlapping portion 5 is preferably made of the same flexible sheet as the first bag portion 2. Furthermore, the first bag portion 2 and the overlapping portion 5 may be made of a single flexible sheet, or may be made by joining separate independent flexible sheets. When the first bag portion 2 and the overlapping portion 5 are made of a single flexible sheet, the overlapping portion 5 is made by folding it back inside the bag structure.

[0042] The overlapping portion 5 is made of a strip-shaped flexible sheet and has the same length in the width direction W as the flexible sheet of the first bag portion 2. The length in the up-down direction H of the strip-shaped flexible sheet that forms the overlapping portion 5 is 1 / 10 or less of the length in the up-down direction H of the flexible sheet of the first bag portion 2, and is 10 mm in this embodiment.

[0043] Because the bag 1 has the overlapping portion 5, the rigidity of the upper end band region 25 can be locally increased even if it is made of low-density polyethylene. Moreover, because the overlapping portion 5 is folded back inside the bag structure, it has the advantage of remaining in a state that is difficult to unravel. As a result, the stability of the operation when opening the upper end band region 25 in the bag-opening structure (Figure 3) described below can be increased. Furthermore, because the overlapping portion 5 is partially thick, air can easily enter the bag from the upper end band region 25 of the first bag portion 2, making it less likely to stick to the second bag portion 3. As a result, the opening 11 can be easily opened.

[0044] <Bag function> Next, the operation of the bag 1 will be described with reference to FIG. 3. When the bag-opening mechanism V is inserted into the opening 11 of the bag 1 as shown in FIG. 3(A) and the opening 11 of the bag 1 is opened, ideally, the entire area of ​​the first bag portion 2 should be separated from the second bag portion 3, tilting around the portion connecting the lower end of the first bag portion 2 and the second bag portion 3 as an axis, as shown in FIG. 3(B). However, due to the flexibility of low-density polyethylene, the first bag portion 2 and the second bag portion 3 may be difficult to separate due to static electricity in the lower regions near the lower ends of the first bag portion 2 and the second bag portion 3, as shown in FIG. 3(C). Here, the state in which the entire area of ​​the first bag portion 2 is separated from the second bag portion 3, as shown in FIG. 3(B), and the opening area surrounded by the opening 11 is maximized, is defined as the fully opened state of the opening 11, and the above state is defined as the incompletely opened state of the opening 11. Naturally, the opening area of ​​the opening 11 in the incompletely opened state is smaller than the opening area of ​​the opening 11 in the fully opened state. Nevertheless, if the opening area of ​​opening 11 in the fully open state is large enough, the opening area is likely to be large enough to put an object in even if opening 11 is in the incompletely open state as described above.

[0045] Here, to index the fully open state of the opening 11, attention is focused on the distance between the first upper end center 21, which is the center in the width direction W of the upper end of the first-bag-side facing surface 20 of the first bag portion 2 relative to the second bag portion 3, and the second upper end center 31, which is the center in the width direction W of the upper end of the second-bag-side facing surface 30 of the second bag portion 3 relative to the first bag portion 2. When the opening 11 is fully open, the separation distance between the first upper end center 21 and the second upper end center 31 is at its maximum. If this maximum separation distance T is large, the opening 11 is likely to have an opening area large enough to hold an item, even in an incompletely open state. The maximum separation distance T is preferably 3 cm or more, more preferably 3.5 cm or more, and even more preferably 4 cm or more.

[0046] <Bundle of bags> As shown in FIG. 2 , the bag bundle 10 is formed by bundling a plurality of bags 1. In the bag bundle 10, the plurality of bags 1 are stacked with the positions of the corresponding engagement holes 41 and sides aligned, and are joined to one another at joints. In this embodiment, the joints are formed by welding portions 12 formed by piercing a needle heated to a high temperature through the entire thickness of the bag bundle 10 to open welding holes, and then thermally welding the bags 1 together through the welding holes. However, this is only one example of a joint, and the bag bundle 10 may of course be formed by joining the bags 1 using external members such as clips or staples, or by joining the bags 1 with adhesive or the like. The following description will be given taking the case where the joints are formed by welding portions 12 as an example, but the following description can also be applied to other types of joints.

[0047] As shown in FIGS. 1A and 2B, the welded portions 12 are provided on the distal extension 4B. Various positions on the distal extension 4B are conceivable. For example, when the distal extension 4B is divided into two equal parts in the width direction W, at least one welded portion 12 may be provided in each of the two equal parts. In this case, as shown in FIG. 1A, the welded portions 12 may be formed near both ends of the distal extension 4B in the width direction W. That is, in FIG. 1, one welded portion 12 is preferably formed at a position shifted toward the first outer edge G1 from the first boundary K1 in the width direction W. The other welded portion 12 is preferably formed at a position shifted toward the second outer edge G2 from the second boundary K2 in the width direction W.

[0048] Furthermore, when the bag bundle 10 is made of a low-rigidity material such as low-density polyethylene, as in this embodiment, the rigidity of the entire bag bundle 10 is also low. As a result, when the bag bundle 10 bends, the positions of the engagement holes 41 of the multiple bags 1 constituting the bag bundle 10 become misaligned. For this reason, it is preferable to provide the welded portions 12 at positions that maintain the alignment of the engagement holes 41 of the multiple bags 1. Specifically, as shown in FIG. 4(A), it is preferable to provide the welded portions 12 near the engagement holes 41. Specifically, a first welded portion 12A may be provided near either the left or right of each engagement hole 41 in the width direction W, or near both the left and right sides of each engagement hole 41. In this case, it is preferable to form the first welded portion 12 separately from the welded portion 12. Furthermore, a second welded portion 12B may be provided near either the up-down direction H of each engagement hole 41, or near both the up-down and down-side of each engagement hole 41. In this case, it is preferable to form the second welded portion 12 separately from the welded portion 12. Furthermore, third welded portions 12C may be provided near each engagement hole 41 in an inclined direction inclined in both the vertical direction H and the width direction W. In this case, it is preferable to form these third welded portions 12 in addition to the above-mentioned welded portions 12. Furthermore, the first welded portion 12A, the second welded portion 12B, and the third welded portion 12C may be provided simultaneously. This makes it difficult for the positions of the engagement holes 41 of the stacked bags 1 to shift even if the entire bag bundle 10 is bent.

[0049] 4(B), lines passing through the centers C of two engagement holes 41 arranged in parallel in the width direction W in the up-down direction H are defined as boundaries K3 and K4, and the region between the two engagement holes 41 (the region between boundaries K3 and K4) is defined as a second central region, one region adjacent to the second central region on both sides of the second central region in the width direction W (the region between boundaries K3 and G1) is defined as a second right end region, and the other region (the region between boundaries K4 and G2) is defined as a second left end region. For example, in order to maintain the rectangular shape of the bag-bundle 10, it is preferable to provide one or more welded portions 12 in each of the second right end region and the second left end region.

[0050] Furthermore, for example, to eliminate misalignment of the engagement holes 41 of the multiple bags 1, it is preferable to provide one or more welded portions 12 in the second central region. When providing multiple welded portions 12 in the second central region, it is preferable to provide each welded portion 12 at a position where a line L1 (hereinafter referred to as the engagement hole center passing line) that passes through each of the centers C of the two engagement holes 41 and extends in the width direction W passes through each welded portion 12. Furthermore, when the second central region is divided into four equal parts in the width direction W, it is preferable to provide a welded portion 12 in each of regions R1 and R2 at both ends of the second central region.

[0051] Furthermore, for example, it is preferable to provide a plurality of welded portions 12 in each of the second right end region and the second left end region. In this case, one welded portion 12 (distal joint portion) is formed far from the engagement hole 41, and the other welded portion 12 (proximal joint portion) is formed close to the engagement hole 41. This allows the distal welded portion 12 to maintain the rectangular shape of the bag bundle 10, while the proximal welded portion 12 prevents the engagement hole 41 from shifting out of position. Specifically, when each of the second right end region and the second left end region is divided into three equal parts in the width direction W, it is preferable that some of the multiple welded portions 12 be provided in an end region R3 adjacent to the engagement hole 41, and the remaining some of the multiple welded portions 12 be provided in an end region R4 including the outer edge of the distal extension 4B in the width direction W. Furthermore, it is preferable that the welded portion 12 included in the end region R3 be provided at a position where the engagement hole center passing line L1 passes. Furthermore, the welded portions 12 included in the end region R4 are preferably located higher than the welded portions 12 in the end region R3, specifically, at a position shifted upward from the center line L1 of the engagement hole (i.e., toward the corner of the bag bundle 10). In this case, the welded portions 12 provided in each of the end regions R4 on both ends are preferably located above the center line L1 of the engagement hole and overlap with a parallel line L2 that is parallel to the center line L1 of the engagement hole. Furthermore, one or more welded portions 12 may also be formed in the second central region at a position overlapping with the parallel line L2. In this case, it is preferable that the welded portion 12 is formed in the center of the second central region in the width direction W.

[0052] As described above, the welded portions 12 can be provided in various positions, but increasing the number of welded portions 12 increases the manufacturing cost of the bag bundle 10. If two welded portions 12 are formed to reduce the manufacturing cost of the bag bundle 10, it is preferable that each of the two welded portions 12 be formed in a position overlapping the parallel line L2 in each of the end regions R4 at both ends. Furthermore, if three welded portions 12 are formed, it is preferable that each of the three welded portions 12 be provided in each of the end regions R4 at both ends and in the second central region, and that all be formed in a position overlapping the parallel line L2. Note that the welded portions 12 may be provided in a position where the parallel line L2 is replaced with the center line L1 passing through the engagement holes.

[0053] As described above, in the bag bundle 10 of this embodiment, the rectangular posture of the entire bag bundle 10 is maintained by the welded portions 12 on the end region R4 side, i.e., the distal welded portions 12 located at a distance from the engagement hole 41 in the width direction and / or up-down direction. At the same time, displacement of the engagement hole 41 is suppressed by the welded portions 12 in regions R1, R2 and end region R3, i.e., the proximal welded portions 12 located closer to the engagement hole 41 in the width direction and / or up-down direction. Of course, the rigidity of the entire bag bundle 10 can also be increased by the welded portions 12 in regions R1, R2 and end region R3.

[0054] Furthermore, if the welding portions 12 are provided as described above in each of the second central region, the second right end region, and the second left end region, the degree of positional misalignment of each engagement hole 41 can be reduced even if the position of the welding portions 12 is somewhat distant from the engagement holes 41.

[0055] Alternatively, multiple matching and overlapping engagement holes 41 may be heat-sealed to form the welded portion 12. This can be achieved by passing a needle or the like heated to a high temperature through the engagement holes 41 and bringing the needle or the like into contact with multiple locations. Furthermore, the top end surface 13 (see FIG. 4(B)) of the bag bundle 10 may be heat-sealed to form the welded portion 12. This can be achieved by bringing a needle or the like heated to a high temperature into contact with multiple locations on the top end surface 13 of the bag bundle 10.

[0056] The present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention. [Explanation of symbols]

[0057] 1 bag 2 First bag section 3 Second bag section 4 Extension 4A Proximal Extension 4B Distal extension 5 Superimposed section 10 bags bundle 11 Aperture 12 Welded area 12A First weld part 12B Second Welding Portion 12C Third Welding Portion 20 First Bag Side Opposing Surface 21 First Upper End Center 25 Upper End Band Region 30 Second Bag Side Opposing Surface 31 Second Upper End Center 40 Stitch [[ID=I7]]40A Cut Portion 40B Uncut Portion 41 Engagement Hole 100 Bag Holding Structure 110 Engagement Rod C Center F1 Center G1 First Outer Edge G2 Second Outer Edge H Vertical Direction K1 First Boundary K2 Second Boundary K3 Boundary K4 Boundary L Engagement Hole Center Passing Line R Region R1 Region R2 Region R3 End Region R4 End Region T Maximum Separation Distance W Width Direction

Claims

1. A bag bundle in which bags capable of containing articles are bundled by a bag structure, The bag is a sheet-like first bag portion; a sheet-like second bag portion arranged opposite the first bag portion and constituting the bag structure in cooperation with the first bag portion, the second bag portion having an opening at an upper end in the vertical direction; A sheet-like extension portion extending further upward from the upper end of the second bag portion and having perforations extending in its width direction; Equipped with the first bag portion, the second bag portion, and the extension portion are formed from a sheet whose main component is low-density polyethylene; When the length of the cut portion, which is the portion where the perforation is cut, is used as a reference, the length of the uncut portion, which is the portion where the perforation is not cut, is 3 / 5 or more of the length of the cut portion. Bag bundle.

2. The length of the uncut portion is at least 2 / 3 of the length of the cut portion. The bag bundle according to claim 1.

3. A bag bundle in which bags capable of containing articles are bundled by a bag structure, The bag is a sheet-like first bag portion; a sheet-like second bag portion arranged opposite the first bag portion and constituting the bag structure in cooperation with the first bag portion, the second bag portion having an opening at an upper end in the vertical direction; A sheet-like extension portion extending further upward from the upper end of the second bag portion and having perforations extending in its width direction; Equipped with the first bag portion, the second bag portion, and the extension portion are formed from a sheet whose main component is low-density polyethylene; The length of the uncut portion, which is the portion of the perforation that is not cut, is 2 mm or more. Bag bundle.

4. The length of the cut portion, which is the portion where the perforation is cut, is 5 mm or less. The bag bundle according to claim 3.

5. When the upper end of the first bag portion in the vertical direction is separated from the second bag portion to open the opening, a maximum separation distance between the center of the width direction of the upper end of the second bag portion in the vertical direction and the center of the width direction of the upper end of the first bag portion in the vertical direction is 3 cm or more. The bag bundle according to any one of claims 1 to 4.

6. The extension portion has: an engagement hole for hanging the bag above the perforation in the vertical direction; a connecting portion for connecting the plurality of stacked bags in the vicinity of the engagement hole; is formed, The bag bundle according to claim 1.

7. The coupling portions are arranged in pairs at positions that sandwich the engagement hole in at least one direction selected from the width direction, the vertical direction, and directions inclined toward both the width direction and the vertical direction. The bag bundle according to claim 6.

8. The extension portion has: an engagement hole for hanging the bag above the perforation in the vertical direction; a distal joining portion formed at a position far from the engagement hole and joining the plurality of stacked bags together; a proximal joining portion formed at a position close to the engagement hole and joining the plurality of stacked bags together; is formed, The bag bundle according to claim 1.

9. The extension portion has: an engagement hole for hanging the bag, the engagement hole being located above the perforation in the vertical direction; a joining portion for joining the plurality of stacked bags together; is formed, The engagement holes are formed in two in parallel in the width direction, When the extension portion is divided into three equal parts in the width direction, One of the engagement holes is formed in one end region, The other engagement hole is formed in the other end region, When the extension portion is divided into three regions in the width direction by two lines that pass through the centers of the one engagement hole and the other engagement hole and extend in the up-down direction as boundaries, At least one of the connecting portions is formed in each of the two regions located on both outer sides in the width direction. The bag bundle according to claim 1.

10. At least one of the coupling portions is formed in a central region located in the center of the three regions. The bag bundle according to claim 9.

11. The connecting portions located in each of the three regions are formed at positions that pass through the centers of the two engagement holes and overlap with an engagement hole center passing line that extends in the width direction, or are positioned at positions that are shifted upward from the engagement hole center passing line and overlap with a parallel line that is parallel to the engagement hole center passing line. The bag bundle according to claim 10.

12. The extension portion has: an engagement hole for hanging the bag above the perforation in the vertical direction; a joining portion for joining the plurality of stacked bags together; is formed, The engagement holes are formed in two in parallel in the width direction, When the extension portion is divided into three equal parts in the width direction, One of the engagement holes is formed in one end region, The other engagement hole is formed in the other end region, When the extension portion is divided into three regions in the width direction by two lines that pass through the centers of the one engagement hole and the other engagement hole and extend in the up-down direction as boundaries, The connecting portions are formed in two or more of the two regions located on both outer sides in the width direction. The bag bundle according to claim 1.

13. A bag bundle in which bags capable of containing articles are bundled by a bag structure, The bag is a sheet-like first bag portion; a sheet-like second bag portion arranged opposite the first bag portion and constituting the bag structure in cooperation with the first bag portion, the second bag portion having an opening at an upper end in the vertical direction; A sheet-like extension portion extending further upward from the upper end of the second bag portion and having perforations extending in its width direction; Equipped with The extension portion has: an engagement hole for hanging the bag above the perforation in the vertical direction; a distal joining portion formed at a position far from the engagement hole and joining the plurality of stacked bags together; a proximal joining portion formed at a position close to the engagement hole and joining the plurality of stacked bags together; is formed, Bag bundle.

14. A bag that can store items using a bag structure, a sheet-like first bag portion; a sheet-like second bag portion arranged opposite the first bag portion and constituting the bag structure in cooperation with the first bag portion, the second bag portion having an opening at an upper end in the vertical direction; A sheet-like extension portion extending further upward from the upper end of the second bag portion and having perforations extending in its width direction; Equipped with the first bag portion, the second bag portion, and the extension portion are formed from a sheet whose main component is low-density polyethylene; When the length of the cut portion, which is the portion where the perforation is cut, is used as a reference, the length of the uncut portion, which is the portion where the perforation is not cut, is 3 / 5 or more of the length of the cut portion. bag.

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