JP2022019514A - Flat bag for packaging and laminate thereof - Google Patents

Abstract

To provide a flat bag for packaging capable of being stored in a thin flat bag and its laminate.SOLUTION: Both left and right sides of a bag body 2 in a cylindrical shape are folded inside to form side gussets, a projection piece 6 projecting upward from an upper end opening is formed at a flat bag for packaging obtained by applying a heat seal on a bottom of the bag body 2 and a laminate is structured by multiple flat bags for packaging overlapped. A tear line 7 is formed at an overlap part of the projection piece 6 and the projection pieces 6 are welded each other by perforating a hole 11 above by a heated rod-like member. The tear line 7 comprises slits 7a and a coupling part 7b interposed between the slits 7a, and a length of the coupling part 7b is formed to be significantly shorter than a length of each slit 7a. The bag is configured to open easily when the bag body 2 is removed from the projection piece 6 by a structure of the tear line 7 and a thickness difference of the side gussets.SELECTED DRAWING: Figure 4

Description

The present invention relates to a wrapping flat bag for packaging products sold in supermarkets and convenience stores, and a laminate thereof.

Supermarkets and convenience stores offer thin synthetic resin packaging bags for packaging products. Similar to the tissue in the case, this kind of packaging bag is stored in the case in a separated state, and the bag is taken out from the case and used for packaging the product.

However, in this aspect, not only is it inconvenient to use because the bags are separated one by one, and when opening the upper end opening of the flat bag, the fingertips are moistened with a hand towel or the like to shift the front and back films back and forth and left and right. However, this makes the opening work complicated, and it is not preferable in terms of hygiene to wet the fingertips with a hand towel used by an unspecified number of users.

In addition, we also provide a form in which a flat bag that is continuously made into a roll that can be separated by perforations is held on a roll holding table, and the tip of the flat bag is pulled out while being separated at the perforation of the bottom portion. Has been done.

However, in this aspect, since a dedicated holding table is used, not only the securing of the installation place becomes an issue, but also the opening work of the opening becomes complicated and hygienic is not preferable as described above. do not have.

In Patent Document 1, a large number of packaging bags are provided in which a tubular resin film having both ends folded in half in the longitudinal direction is subjected to corona discharge treatment, the bottom side is hermetically sealed, and the upper end side is open. Stack them into a bundle, make holes in multiple places at the same time near the ends of these packaging bags by punching means, and use these holes to integrally bundle the packaging bags, and then combine the packaging bags from this bundle. A laminate of bags that can be taken out one by one is disclosed. Patent Document 1 also discloses a configuration in which a protrusion is provided on the opening side of the packaging bag, and a hole for inserting a bundle of packaging bags and a notch for separating the protrusion from the bag body are provided in the protrusion. There is.

The characteristic configuration of Patent Document 1 is the effect of the adhesive force due to the corona discharge treatment, and when the packaging bags are peeled off one by one, the second packaging bag is placed on the peeled first packaging bag. A configuration is disclosed in which the opening of the second packaging bag is naturally opened by being adhered. As a result, the opening of the second packaging bag can be easily opened and the product can be easily stored.

Further, Patent Document 2 discloses a garbage bag with a handbag, and a tongue piece is formed in the center of the opening thereof, and the tongue piece is heated as a binding element for integrally binding a plurality of bags to the tongue piece. Disclosed is a configuration in which a rod is made to penetrate through a plurality of stacked bags to form a bonding hole, and a sheet around the rod is melted to integrally bond the plurality of bags to form a bag aggregate. There is. It is also disclosed that the tongue piece uses a perforation or a weakening line for separation to separate from the bag body.

Japanese Unexamined Patent Publication No. 2004-262531 Japanese Unexamined Patent Publication No. 2013-86860

By the way, in Patent Document 1, the opening of the opening of the thin synthetic resin packaging bag is left in the bundle with the second packaging bag opened by the effect of the adhesive force due to the corona discharge treatment. In this case, the packaging bag is naturally opened and is already opened when the next user uses it, which is not preferable in terms of hygiene.

Further, in Patent Document 2, thick garbage bags are used in layers and peeled off one by one from the inside, and can be used as a form of a flat bag for packaging in which products are stored separately one by one. It's not a thing.

In view of the above, an object of the present invention is to provide a packaging flat bag and a laminate thereof, which are convenient for individually storing products in a packaging flat bag in a supermarket or the like.

In order to achieve the above object, in the flat bag for packaging of the present invention, the left and right sides of the bag body formed in a tubular shape are folded inward to form a side gusset, and the bottom of the bag body is heat-sealed to form a bottom seal portion. A flat bag with a side gusset or a flat bag without a side gusset formed by heat-sealing the bottom of the bag body formed in a tubular shape to form a bottom seal, and is on the upper end side of the bag body. A flat bag for packaging is formed with an upper end opening and a protruding piece protruding upward, and a tear line for separating the protruding piece and the bag body is formed between the protruding piece and the vicinity of the upper end of the bag body. , A large number of sheets are stacked to form a laminated body of flat bags for packaging. Then, in the overlapping portion of the protruding pieces, the protruding pieces are welded to each other by making a hole above the tear line by a heating means, and the tear line is composed of a slit and a connecting portion, and the connecting portion is formed. The length of the portion is formed to be significantly shorter than the length of the slit.

The tear line is formed by perforations, etc., but by forming the length of the connecting portion significantly shorter than the length ratio between the connecting portion of the normal perforation and the slit, the bag body is projected. It is easy to separate from the opening and the opening is also easy to open. The tear line is composed of two slits, a left and right connecting portion, and a connecting portion between both slits, and it is preferable to set the ratio of the length of the connecting portion to the length of the slit to 3: 7 to 1: 9. As a result, the bag body can be easily separated from the protruding piece, and the opening can be easily opened. Then, two slits are formed, connecting portions are formed on the left and right sides of each slit, the left and right connecting portions are located between the rising portion of the protruding piece and the slit, and the connecting portion in the middle is the two slits. Located in between. As a result, the connecting portions on both the left and right sides can be torn smoothly, and a clean rift with few protrusions can be obtained.

Further, the bag body is a film containing any one or more of high-density polyethylene (HDPE), low-density polyethylene (LDPE), and polypropylene (PP), and further, the high-density polyethylene (HDPE) and calcium carbonate. The thickness of the polyethylene (PE) -based film is preferably 0.004 mm to 0.05 mm, and the thickness of the polypropylene (PP) -based film is preferably 0.01 mm to 0.05 mm. Even in a thin flat bag for packaging, the presence of the side gusset makes it easier to open the opening by shifting the film on the front and back toward the surface of the film.

In addition, by providing diagonal seals from the left and right ends to the bottom of the lower part of the bag body, a bottom gusset can be formed so that the products can be stably stored.

According to the present invention, the ratio of the length between the slit and the connecting portion is made so that the connecting portion is significantly reduced, so that when the flat bag is cut from the bundle, it is easy to separate from the protruding piece and the upper end opening of the flat bag is opened. The part is also easy to open, and it is hygienic because the upper end opening is opened by its own opening operation. And since it is a flat bag with side gussets, even though it is a thin packaging bag, the side gussets for folding on both the left and right sides make it easy to create a gap between the front and back films, making it easy to move the films to the left and right. It becomes easier to open the upper end opening by shifting it back and forth.

It is a perspective view which shows the use state of the flat bag laminated body for packaging which is 1st Embodiment of this invention. It is also a perspective view of a flat bag for packaging with a side gusset separated from a protruding piece. It is a front view of the wrapping flat bag with a side gusset which also has a protruding piece. It is an enlarged view of the tear line between a protrusion piece and a bag body. It is a front view which shows the other embodiment which has a bottom gusset. A front view showing another embodiment of the projecting piece, in which (a) a mode having a pair of left and right projecting pieces, (b) a mode having a semicircular projecting piece, and (c) a mode having a trapezoidal projecting piece. , (D) is a trapezoidal projecting piece, and the tear line is located below the projecting piece. It is a perspective view which shows the use state of the flat bag laminate for packaging without a side gusset which is a 2nd Embodiment. It is also a perspective view of a flat bag for packaging without a side gusset separated from a protruding piece. It is a front view of the flat bag for packaging without a side gusset which also has a protruding piece. It is an enlarged view of the tear line between a protrusion piece and a bag body. It is a front view which shows the other embodiment which has a bottom gusset. A front view showing another embodiment of the projecting piece, in which (a) a mode having a pair of left and right projecting pieces, (b) a mode having a semicircular projecting piece, and (c) a mode having a trapezoidal projecting piece. , (D) is a trapezoidal projecting piece, and the tear line is located below the projecting piece.

An embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 3, in the packaging flat bag 1 of the first embodiment, the left and right sides of the bag body 2 formed in a cylindrical shape by inflation processing are folded inward to form a side gusset 3 and a bag. The bottom of the main body 2 is heat-sealed to form the bottom seal portion 4.

The upper end side of the bag body 2 is punched to form an upper end opening 5 and a rectangular protruding piece 6 projecting upward. A tear line 7 for separating the projecting piece 6 and the bag body 2 is formed between the projecting piece 6 and the vicinity of the upper end of the bag body 2.

A large number of such packaging flat bags 1 are stacked to form a laminated body 10 of the packaging flat bags 1. Then, by making a hole 11 above the tear line 7 in the overlapping portion of the protruding pieces 6 by a heating means such as a heated rod-shaped member (not shown), the periphery of the hole is melted and the protruding pieces 6 are welded to each other. However, the laminated body 10 is configured so that the bundle of the flat packaging bags 1 is not separated into pieces. The hole 11 has a function of welding the protruding pieces to each other and a function of penetrating and holding the laminated laminated body through the rod-shaped hooking member 13 (see FIG. 1). The number of stacking flat bags 1 is not particularly limited, and depending on the usage situation, 2 to 500 sheets, preferably 50 to 300 sheets, and more preferably 50 to 100 sheets are laminated. It can be a body 10.

As shown in FIG. 4, the tear line 7 is composed of a plurality of slits 7a and a plurality of connecting portions 7b. The length B of the connecting portion 7b is formed to be significantly shorter than the length A of the slit 7a. Two slits 7a having the same length are formed, and connecting portions 7b are formed on the left and right sides of each slit 7a. The slit 7a is located on the extension of the upper opening edge, the left and right connecting portions 7b are located between the rising portion of the protruding piece 6 and the slit 7a, and the middle connecting portion 7b is located between the two slits 7a. .. The left and right connecting portions 7b and the middle connecting portion 7b have the same length. Further, the length of the rising portion of the protruding piece 6 in the left-right direction is smaller than the length of the upper opening edge of the bag body 2. That is, the ratio of the length of the rising portion of the protruding piece 6 in the left-right direction to the length of the upper opening edge of the bag body 2 is 1: 8.

The tear line 7 is formed by a perforation or the like, but the length B of the connecting portion 7b is significantly shorter than the ratio B: A of the length between the connecting portion 7b of the normal perforation and the slit 7a. By forming the bag body 2, the bag main body 2 can be easily separated from the protruding piece 6, and the upper end opening 5 can be easily opened. For the length B of the connecting portion 7b, the ratio of the length B of the connecting portion 7b to the length A of the slit 7a is preferably set to 3: 7 to 1: 9, and more preferably 2: 8. .. As a result, the bag body 2 can be easily separated from the protruding piece 6, and the upper end opening 5 can also be easily opened. The tear line 7 is not limited to the linear line shown in FIG. 4, but may be a curved line shape (for example, a wavy shape or an arc shape). Therefore, the shape of the slit 7a can be applied regardless of whether it is linear or curved.

The bag body 2 is a film containing any one or more of high-density polyethylene (HDPE), low-density polyethylene (LDPE), and polypropylene (PP), and further, the high-density polyethylene (HDPE) and calcium carbonate. The polyethylene (PE) -based film has a thickness of 0.004 mm to 0.05 mm, preferably 0.004 mm to 0.03 mm, and more preferably 0.004 mm to 0.02 mm. Is. The thickness of the polypropylene (PP) -based film is preferably 0.01 mm to 0.05 mm, preferably 0.01 mm to 0.03 mm, and more preferably 0.01 mm to 0.02 mm. Even in the thin packaging flat bag 1, due to the presence of the side gusset 3, that is, the left and right sides are stacked with four films, and the central part is stacked with two films. Is shifted in the direction of the surface of the film to make it easier to open the opening 5.

A method for manufacturing the packaging flat bag 1 with the side gusset will be described. For example, the left and right sides of a synthetic resin film formed into a tubular shape by inflation molding are folded inward to form a side gusset 3, and the bottom side of the bag body 2 is heat-sealed to form a bottom seal portion 4. The bottom seal portion 4 cuts to form the bag body 2. The upper end side of the bag body 2 is continuously formed by punching the upper end opening 5 and the projecting piece 6 projecting upward, and further, the projecting piece 6 is formed between the projecting piece 6 and the vicinity of the upper end of the bag body 2. A tear wire 7 that separates the 6 and the bag body 2 is formed.

A large number of bag bodies 2 molded as described above are stacked, and a heated rod-shaped member (not shown) is pressed above the tear line 7 of the overlapped portion of the protruding pieces 6 to penetrate the laminated body 10. The holes 11 are formed, and the protruding pieces 6 are welded to each other by melting the holes 11 to form a laminated body 10 so that the bundles of the packaging flat bags 1 do not separate from each other.

At the time of use, the hole 11 of the protruding piece 6 of the laminated body 10 is locked to the hooking member 13 for use. At this time, when the bag main body 2 is pulled downward, the projecting piece 6 is left on the bag member 13 and torn, and a flat bag 1 with a side gusset 3 as shown in FIG. 2 can be obtained.

At this time, since it is a flat bag 1 with a side gusset 3, even though it is a thin flat bag for packaging, the side gussets 3 for folding on both the left and right sides make it easy to create a gap between the front and back films, which is easy. The upper end opening 5 can be easily opened by shifting the films back and forth and left and right. Further, since the ratio of the lengths of the slit 7a of the tear line 7 and the connecting portion 7b is set so that the connecting portion 7b is significantly reduced, the flat bag 1 protrudes when the flat bag 1 is cut from the bundle of the laminated body 10. It is easy to separate from the piece 6, and the upper end opening 5 of the flat bag 1 is also easy to open, and the opening operation of the upper end opening 5 is also hygienic.
Moreover, since the projecting piece 6 is formed to be narrower in width than the upper opening edge of the bag body 2, when the bag body 2 is pulled, the force is likely to be concentrated on the projecting piece 6. By opening the two slits 7a, the connecting portion 7b between the two slits 7a is first torn, and the connecting portions 7b on both the left and right sides can be smoothly torn, and a clean rift with few protrusions can be obtained.

Next, the packaging flat bag 1 without the side gusset of the second embodiment is shown in FIGS. 7 to 9. The left and right sides of the bag body 2 formed into a tubular shape by inflation processing are folded, and the bottom of the bag body 2 is heat-sealed to form the bottom seal portion 4.

The upper end side of the bag body 2 is punched to form an upper end opening 5 and a rectangular protruding piece 6 projecting upward. A tear line 7 for separating the projecting piece 6 and the bag body 2 is formed between the projecting piece 6 and the vicinity of the upper end of the bag body 2. As shown in FIG. 4, the tear line 7 is composed of a slit 7a and a connecting portion 7b interposed between the slits 7a.

A large number of such packaging flat bags 1 are stacked to form a laminated body 10 of the packaging flat bags 1. Then, by making a hole 11 above the tear line 7 in the overlapping portion of the protruding pieces 6 by a heating means such as a heated rod-shaped member (not shown), the periphery of the hole is melted and the protruding pieces 6 are welded to each other. However, the laminated body 10 is configured so that the bundle of the flat packaging bags 1 is not separated into pieces. The hole 11 has a function of welding the protruding pieces to each other and a function of penetrating and holding the laminated laminated body through the rod-shaped hooking member 13 (see FIG. 7). Other configurations are the same as those in the first embodiment.

A method for manufacturing a flat bag for packaging without a side gusset will be described. For example, the bottom side of a synthetic resin film formed into a tubular shape by inflation molding is heat-sealed to form a bottom seal portion 4, and the bottom seal portion 4 cuts to form a bag body 2. The upper end side of the bag body 2 is continuously formed by punching the upper end opening 5 and the projecting piece 6 projecting upward, and further, the projecting piece 6 is formed between the projecting piece 6 and the vicinity of the upper end of the bag body 2. A tear wire 7 that separates the 6 and the bag body 2 is formed.

A large number of bag bodies 2 molded as described above are stacked, and a heated rod-shaped member (not shown) is pressed above the tear line 7 of the overlapped portion of the protruding pieces 6 to penetrate the laminated body 10. The holes 11 are formed, and the protruding pieces 6 are welded to each other by melting the holes 11 to form a laminated body 10 so that the bundles of the packaging flat bags 1 do not separate from each other.

At the time of use, the hole 11 of the protruding piece 6 of the laminated body 10 is locked to the hooking member 13 for use. At this time, when the bag main body 2 is pulled downward, the bag 1 is cut by the tear wire 7 leaving the projecting piece 6 on the hook member 13, and the flat bag 1 without the side gusset can be obtained.

At this time, the ratio of the lengths of the slit 7a of the tear wire 7 to the connecting portion 7b is set so that the connecting portion 7b is significantly reduced, so that when the flat bag 1 is cut from the bundle of the laminated body 10. It becomes easy to separate from the projecting piece 6. Moreover, since the center of the bag body in the left-right direction is pulled and the protruding piece 6 is torn, a gap is created at the upper end opening edge after the torn bag, and the upper end opening 5 of the flat bag 1 is easily opened, and the upper end is easily opened. The opening operation of the opening 5 is also hygienic.

It should be noted that the present invention is not limited to the above embodiment, and it goes without saying that many modifications and changes can be made within the scope of the present invention. For example, as a modification of the above embodiment, as shown in FIGS. You can also do it. With this bottom gusset 15, the bottom of the bag can be opened widely, and products can be stably stored.

Further, the shape and number of the protruding pieces 6 are not limited to the above embodiment, and various aspects shown in FIGS. 6 and 12 can be adopted. The figure (a) has a pair of left and right projecting pieces 6, the figure (b) has a semicircular projecting piece 6 in the center, and the figure (c) has a trapezoidal projecting piece 6 in the center. The embodiment (d) shows a trapezoidal projecting piece 6 in which the tear line 7 is located above the upper opening end and below the projecting piece 6. In either case, the distance between the slit 7a of the tear line 7 and the connecting portion 7b is the same as that of the above embodiment.
The configuration of the tear wire 7 is not limited to the above embodiment, and the two slits 7a may be brought close to each other. That is, the length of the connecting portion 7b in the middle is made shorter than the length of the left and right connecting portions 7b, and the distance between the two slits 7a is narrowed. As a result, one long slit 7a is formed, and even if the bag body 2 is pulled with a light force, the bag body 2 can be easily separated from the projecting piece 6.

Further, in the above embodiment, the laminated body 10 in which a large number of packaging flat bags 1 are stacked has been described, but it goes without saying that a single packaging flat bag may be used. That is, in the flat bag 1 for packaging, the left and right sides of the bag body 2 formed in a tubular shape are folded inward to form a side gusset 3, and the bottom of the bag body 2 is heat-sealed to form a bottom seal portion 4. A flat bag with a side gusset, or a flat bag without a side gusset in which the bottom of the bag body 2 formed in a tubular shape is heat-sealed to form the bottom seal portion 4, and the upper end opening is on the upper end side of the bag body 2. The portion 5 and the projecting piece 6 projecting upward are formed, and a tear line 7 for separating the projecting piece 6 and the bag body 2 is formed between the projecting piece 6 and the vicinity of the upper end of the bag body 2, and the tearing line 7 is formed. A locking hole 11 for locking the packaging flat bag is formed above the wire 7, and the tear wire 7 is composed of a slit 7a and a connecting portion 7b, and the length of the connecting portion 7b is long. It is formed to be significantly shorter than the length of the slit, and the ratio of the length of the connecting portion to the length of the slit is set to 3: 7 to 1: 9. Also in this configuration, the same material film and film thickness as in the above embodiment can be adopted.

The molding of the bag body 2 of the flat wrapping bag 1 is not limited to the inflation process, and the sheet-shaped film may be folded back and pasted together on the back side.

1 Flat bag for packaging 2 Bag body 3 Side gusset 4 Bottom seal part 5 Upper end opening 6 Protruding piece 7 Tear line 7a Slit 7b Connecting part 10 Laminated body 11 Hole 13 Baging member 14 Diagonal heat seal part 15 Bottom gusset

Claims (11)

A flat packaging bag made by folding the left and right sides of a tubular bag body inward to form a side gusset and heat-sealing the bottom of the bag body to form a bottom seal. An upper end opening and a projecting piece projecting upward are formed on the upper end side, and a tear line for separating the projecting piece and the bag body is formed between the projecting piece and the vicinity of the upper end of the bag body. A large number of bags are stacked to form a laminated body of flat bags for packaging, and the protruding pieces are welded to each other by making a hole in the overlapping portion of the protruding pieces above the tear line by a heating means. , The tear line is composed of a slit and a connecting portion, and the length of the connecting portion is formed to be significantly shorter than the length of the slit. A flat packaging bag formed by heat-sealing the bottom of a tubular bag body to form a bottom sealing portion. An upper end opening and an upwardly projecting piece are formed on the upper end side of the bag body. A large number of wrapping flat bags having a tear line for separating the projecting piece and the bag body are formed between the protruding piece and the vicinity of the upper end of the bag body, and a laminated body of the wrapping flat bag is formed. The protruding pieces are welded to each other by making a hole in the overlapping portion of the protruding pieces above the tear line by a heating means, and the tear line is composed of a slit and a connecting portion. A flat bag laminate for packaging in which the length of the connecting portion is significantly shorter than the length of the slit. The flat bag laminate for packaging according to claim 1 or 2, wherein the ratio of the length of the connecting portion to the length of the slit is set to 3: 7 to 1: 9. The bag body contains one or more of high-density polyethylene (HDPE), low-density polyethylene (LDPE), and polypropylene (PP), and further contains the high-density polyethylene (HDPE) and calcium carbonate. Any of claims 1 to 3, wherein the polyethylene (PE) -based film has a thickness of 0.004 mm to 0.05 mm and the polypropylene (PP) -based film has a thickness of 0.01 mm to 0.05 mm. Flat bag laminate for packaging described in Crab. The flat bag laminate for packaging according to any one of claims 1 to 4, wherein a bottom gusset is formed by applying diagonal seals from both left and right ends toward the bottom in the lower part of the bag body. Two slits are formed, connecting portions are formed on the left and right sides of each slit, the left and right connecting portions are located between the rising portion of the protruding piece and the slit, and the connecting portion in the middle is between the two slits. The flat bag laminate for packaging according to any one of claims 1 to 5, which is located. A flat packaging bag made by folding the left and right sides of a tubular bag body inward to form side gussets and heat-sealing the bottom of the bag body to form a bottom seal. An upper end opening and a protruding piece protruding upward are formed on the upper end side, and a tear line for separating the protruding piece and the bag body is formed between the protruding piece and the vicinity of the upper end of the bag body, and the tear line is formed from the tear line. A locking hole for locking the flat bag for packaging is formed on the upper side of the bag, and the tear line is composed of a slit and a connecting portion, and the length of the connecting portion is significantly larger than the length of the slit. A flat bag for packaging that is formed short. A flat packaging bag formed by heat-sealing the bottom of a tubular bag body to form a bottom sealing portion. An upper end opening and an upwardly projecting piece are formed on the upper end side of the bag body. A tear line for separating the projecting piece and the bag body is formed between the projecting piece and the vicinity of the upper end of the bag body, and a locking flat bag for locking the flat bag for packaging is formed above the tear line. A flat bag for packaging in which a hole is formed, the tear line is composed of a slit and a connecting portion, and the length of the connecting portion is significantly shorter than the length of the slit. The flat bag for packaging according to claim 7 or 8, wherein the ratio of the length of the connecting portion to the length of the slit is set to 3: 7 to 1: 9. The bag body is a film containing one or more of high-density polyethylene (HDPE), low-density polyethylene (LDPE), and polypropylene (PP), and further contains the high-density polyethylene (HDPE) and calcium carbonate. 7. The polyethylene (PE) -based film has a thickness of 0.004 mm to 0.05 mm, and the polypropylene (PP) -based film has a thickness of 0.01 mm to 0.05 mm. Flat bag for packaging according to any one of 9. The flat packaging bag according to any one of claims 7 to 10, wherein a bottom gusset is formed by applying an oblique seal from both left and right ends toward the bottom in the lower part of the bag body.

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