JP7156767B2 - Flat packaging bag and its laminate - Google Patents

Description

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

Supermarkets and convenience stores provide thin synthetic resin packaging bags for packaging products. This type of packaging bag is stored individually in a case in the same manner as cased tissues, and the bag is taken out from the case and used for product packaging.

However, in this embodiment, the bags are separated one by one, which is inconvenient to use. In addition, when opening the upper end opening of the flat bag, the fingertips are moistened with a towel or the like and the front and back films are shifted back and forth and left and right. However, this complicates the opening operation, and it is not preferable from a sanitary point of view to wet the fingertips with a hand towel used by many and unspecified users.

In addition, there is also provided a type in which a flat bag is continuously detachable by perforations in a roll form, is held on a roll holding table, and is used by being separated by the perforations in the bottom part while pulling out the tip of the flat bag. It is

However, in this embodiment, since a dedicated holding base is used, not only is it necessary to secure a place to install it, but the work of opening the opening is complicated as described above, and it is not preferable from a sanitary point of view. do not have.

In Patent Document 1, a cylindrical resin film folded in half at both ends in the longitudinal direction is subjected to corona discharge treatment, the bottom side is hermetically sealed, and the top side is open. A plurality of holes are simultaneously punched in the vicinity of the ends of these packaging bags by punching means, and these holes are used to integrally bundle the packaging bags. A stack of bags designed to be taken out one by one is disclosed. This 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 that when the packaging bags are peeled off one by one, the second packaging bag is attached to the first peeled packaging bag due to the effect of the adhesive force due to the corona discharge treatment. A configuration is disclosed in which the opening of the second packaging bag is naturally opened by sticking. As a result, the opening of the second packaging bag can be easily opened and the product can be easily accommodated.

Further, Patent Document 2 discloses a garbage bag with a handle portion, in which a tongue is formed in the center of the opening of the bag. A structure is disclosed in which a rod is passed through a plurality of stacked bags to form a connecting hole, and a sheet around the rod is melted to integrally bond the plurality of bags to form a bag assembly. there is It is also disclosed that the tongue uses perforations or weakened lines for separation from the bag body.

JP-A-2004-262531 JP 2013-86860 A

By the way, in Patent Document 1, the opening of the opening of the thin synthetic resin packaging bag is made to remain in the bundle with the second packaging bag opened by the effect of the adhesive force due to the corona discharge treatment. However, in this case, the packaging bag is naturally opened, and the packaging bag is already opened when the next user uses it.

In addition, in Patent Document 2, thick garbage bags are piled up and used one by one from the inside and used, and it can be used as a mode of a packaging flat bag that separates and stores products one by one. not a thing

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

In order to achieve the above object, the flat packaging bag of the present invention has a cylindrical bag body which is folded inward on both left and right sides to form side gussets, and the bottom of the bag body is heat-sealed to form a bottom seal portion. A flat bag with side gussets formed by forming a flat bag or a flat bag without side gussets formed by heat-sealing the bottom of a cylindrically formed bag body to form a bottom seal portion, the upper end side of the bag body A flat packaging bag having an upper end opening and a protruding piece projecting upward formed in the body, and a tear line separating the protruding piece and the bag body between the projecting piece and the vicinity of the upper end of the bag body. , are laminated to form a stack of flat packaging bags. Then, in the overlapped portion of the projecting pieces, a hole is formed by a heating means above the tear line to weld the projecting pieces to each other, and the tear line is composed of a slit and a connection portion, and the connection The length of the portion is formed significantly shorter than the length of the slit.

The tear line is formed by a perforation or the like, and by making the length of the connecting portion significantly shorter than the length ratio between the connecting portion of the perforation and the slit, the protruding piece of the bag body is formed. It makes it easy to separate from, and makes it easy to open the opening. The tear line is composed of two slits, left and right connecting portions, and a connecting portion between both slits, and the ratio of the length of the connecting portion to the length of the slit is preferably set 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. Two slits are formed, and connecting portions are formed on both left and right sides of each slit. located in between. As a result, the right and left connecting portions can be torn smoothly, and a clean tear with little projection can be obtained.

In addition, the bag body is made of a film blended with 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) film is 0.004 mm to 0.05 mm, and the thickness of the polypropylene (PP) film is preferably 0.01 mm to 0.05 mm. Even with a thin flat packaging bag, the presence of side gussets makes it easier to open the opening by shifting the front and back films in the plane direction of the film.

In addition, a bottom gusset can be formed by applying oblique seals from both left and right sides toward the bottom in the lower part of the bag body, so that the products can be stored stably.

According to the present invention, the length ratio between the slit and the connecting portion is set so that the connecting portion is greatly reduced, so that when the flat bag is cut off from the bundle, the flat bag can be easily separated from the protruding piece and the upper end opening of the flat bag can be easily separated. It is hygienic because the upper end opening is opened by the user's own opening operation. In addition, since the flat bag has 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 separate the films from side to side. It becomes easier to open the upper end opening by shifting it back and forth.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing a state of use of the flat bag laminate for packaging according to the first embodiment of the present invention; Fig. 10 is a perspective view of a flat packaging bag with side gussets, which is similarly separated from the protruding piece; FIG. 10 is a front view of a flat packaging bag with side gussets that also have protruding pieces. 4 is an enlarged view of the tear line between the projecting piece and the bag body; FIG. FIG. 11 is a front view of another embodiment having a bottom gusset; It is a front view showing another embodiment of the projecting piece, (a) an aspect having a pair of left and right projecting pieces, (b) an aspect having a semicircular projecting piece, and (c) an aspect having a trapezoidal projecting piece. , (d) show an embodiment in which the tear line is located at the bottom of the trapezoidal protruding piece. FIG. 10 is a perspective view showing a state of use of a laminated flat bag bag without side gussets, which is the second embodiment. Fig. 10 is a perspective view of a flat packaging bag without side gussets, similarly separated from the protruding piece; FIG. 10 is a front view of a side gussetless packaging flat bag having projecting pieces. 4 is an enlarged view of the tear line between the projecting piece and the bag body; FIG. FIG. 11 is a front view of another embodiment having a bottom gusset; It is a front view showing another embodiment of the projecting piece, (a) an aspect having a pair of left and right projecting pieces, (b) an aspect having a semicircular projecting piece, and (c) an aspect having a trapezoidal projecting piece. , (d) show an embodiment in which the tear line is located at the bottom of the trapezoidal protruding piece.

An embodiment according to the present invention will be described based on the drawings. As shown in FIGS. 1 to 3, the flat packaging bag 1 of the first embodiment includes side gussets 3 formed by folding inward the left and right sides of a bag body 2 which is formed in a cylindrical shape by inflation processing. A bottom seal portion 4 is formed by heat-sealing the bottom of the main body 2 .

The upper end of the bag body 2 is punched to form an upper end opening 5 and a rectangular protruding piece 6 protruding upward. A tear line 7 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 stack 10 of flat packaging bags 1 is formed by stacking a large number of such flat packaging bags 1 . Then, a hole 11 is made by a heating means such as a heated rod-shaped member (not shown) at the overlapped portion of the projecting pieces 6 above the tear line 7, so that the periphery of the hole melts and the projecting pieces 6 are welded together. Then, a stack 10 is constructed such that the bundle of flat packaging bags 1 is not separated into pieces. The holes 11 have the function of welding the protruding pieces together and the function of allowing a bar-shaped locking member 13 (see FIG. 1) to pass through and hold the superimposed laminate. The number of overlapping flat packaging bags 1 is not particularly limited, and about 2 to 500 sheets, preferably 50 to 300 sheets, more preferably 50 to 100 sheets are laminated depending on the usage situation. It can be body 10 .

The tear line 7 is composed of a plurality of slits 7a and a plurality of connecting portions 7b, as shown in FIG. The length B of the connecting portion 7b is much 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 positioned on the extension line of the upper opening edge, the left and right connecting parts 7b are positioned between the rising part of the projecting piece 6 and the slit 7a, and the middle connecting part 7b is positioned between the two slits 7a. . The left and right connecting portions 7b and the middle connecting portion 7b have the same length. Moreover, 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 lateral length of the rising portion of the projecting piece 6 to the length of the upper opening edge of the bag body 2 is 1:8.

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

The bag body 2 is made of a film blended with one or more of high-density polyethylene (HDPE), low-density polyethylene (LDPE), and polypropylene (PP). The thickness of the polyethylene (PE) film is 0.004 mm to 0.05 mm, preferably 0.004 mm to 0.03 mm, more preferably about 0.004 mm to 0.02 mm. is. The thickness of the polypropylene (PP) film is preferably 0.01 mm to 0.05 mm, preferably 0.01 mm to 0.03 mm, more preferably about 0.01 mm to 0.02 mm. Due to the presence of the side gussets 3 even in the thin packaging flat bag 1, four sheets of film are stacked on both the left and right sides, and two sheets of film are stacked in the central portion. is shifted in the plane direction of the film so that the opening 5 can be easily opened.

A method of manufacturing the flat packaging bag 1 with side gussets will be described. For example, the side gussets 3 are formed by folding inward the left and right sides of a synthetic resin film formed into a cylindrical shape by inflation molding, and the bottom side of the bag body 2 is heat-sealed to form the bottom seal portion 4, The bag body 2 is formed by cutting at the bottom seal portion 4 . Continuously with this, the upper end side of the bag body 2 is punched to form an upper end opening 5 and a protruding piece 6 protruding upward. A tear line 7 separating 6 and the bag body 2 is formed.

A number of bag bodies 2 formed as described above are stacked, and a heated rod-shaped member (not shown) is pressed above the tear line 7 at the overlapped portion of the protruding piece 6 to penetrate the stack 10. Holes 11 are formed by fusing the holes 11, and the projecting pieces 6 are fused together to form a laminate 10 in which the bundle of flat packaging bags 1 is not separated into pieces.

When used, the hole 11 of the projecting piece 6 of the laminate 10 is engaged with the hooking member 13 for use. At this time, when the bag body 2 is pulled downward, the protruding piece 6 is left on the hooking member 13 and is torn, and the flat bag 1 with the side gussets 3 as shown in FIG. 2 can be obtained.

At this time, since the flat bag 1 with the side gussets 3 is a thin flat bag for packaging, the side gussets 3 for folding on both the left and right sides tend to create a gap between the front and back films, making it easy to open. In addition, the upper end opening 5 can be easily opened by shifting the films in the front, rear, left, and right directions. In addition, since the length ratio between the slit 7a of the tear line 7 and the connecting portion 7b is set so that the connecting portion 7b is greatly reduced, the flat bag 1 is cut off from the bundle of the laminated body 10, and the length of the flat bag 1 does not protrude. It is easy to separate from the piece 6, and it becomes easy to open the upper end opening 5 of the flat bag 1, and the opening operation of the upper end opening 5 is hygienic.
Moreover, since the protruding piece 6 is narrower than the upper opening edge of the bag body 2, when the bag body 2 is pulled, the force tends to be concentrated on the protruding piece 6.例文帳に追加By opening the two slits 7a, the connecting part 7b between the two slits 7a is torn first, and the connecting parts 7b on both the left and right sides can be torn smoothly, and a neat tear with little protrusion can be obtained.

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

The upper end of the bag body 2 is punched to form an upper end opening 5 and a rectangular protruding piece 6 protruding upward. A tear line 7 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 stack 10 of flat packaging bags 1 is formed by stacking a large number of such flat packaging bags 1 . Then, a hole 11 is made by a heating means such as a heated rod-shaped member (not shown) at the overlapped portion of the projecting pieces 6 above the tear line 7, so that the periphery of the hole melts and the projecting pieces 6 are welded together. Then, a stack 10 is constructed such that the bundle of flat packaging bags 1 is not separated into pieces. This hole 11 has the function of welding the protruding pieces together and the function of allowing a rod-shaped locking member 13 (see FIG. 7) to pass through and hold the superimposed laminate. Other configurations are the same as those of the first embodiment.

A method for manufacturing the side gussetless flat packaging bag will be described. For example, the bottom side of a synthetic resin film formed in a cylindrical shape by inflation molding is heat-sealed to form the bottom seal portion 4 , and the bag main body 2 is formed by cutting at the bottom seal portion 4 . Continuously with this, the upper end side of the bag body 2 is punched to form an upper end opening 5 and a protruding piece 6 protruding upward. A tear line 7 separating 6 and the bag body 2 is formed.

A number of bag bodies 2 formed as described above are stacked, and a heated rod-shaped member (not shown) is pressed above the tear line 7 at the overlapped portion of the protruding piece 6 to penetrate the stack 10. Holes 11 are formed by fusing the holes 11, and the projecting pieces 6 are fused together to form a laminate 10 in which the bundle of flat packaging bags 1 is not separated into pieces.

When used, the hole 11 of the projecting piece 6 of the laminate 10 is engaged with the hooking member 13 for use. At this time, when the bag body 2 is pulled downward, the tear line 7 cuts it leaving the projecting piece 6 on the hooking member 13, and the flat bag 1 without side gussets can be obtained.

At this time, the length ratio between the slit 7a of the tear line 7 and the connecting portion 7b is set so that the length of the connecting portion 7b is significantly reduced. It becomes easy to separate from the projecting piece 6. - 特許庁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 formed at the edge of the upper end opening after being torn, and the upper end opening 5 of the flat bag 1 can be 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-described embodiments, and of course 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. 5 and 11, a bottom gusset 15 is formed by forming heat-sealed portions 14 slanted from both left and right sides toward the bottom in the lower portion of the bag body. You can also With this bottom gusset 15, the bottom of the bag can be opened widely, and the products can be stored stably.

Also, the shape and the number of projecting pieces 6 are not limited to those of the above embodiment, and various modes shown in FIGS. 6 and 12 can be adopted. 4(a) shows a mode having a pair of left and right projecting pieces 6, FIG. 4(b) shows a mode having a semicircular projecting piece 6 in the center, and FIG. 4(c) has a trapezoidal projecting piece 6 in the center. FIG. 4(d) shows a trapezoidal protruding piece 6 in which the tear line 7 is located above the upper opening end and below the protruding piece 6. FIG. In either case, the distance between the slit 7a of the tear line 7 and the connecting portion 7b is the same as in the above embodiment.
The configuration of the tear line 7 is not limited to the above embodiment, either, and it may be in a form in which two slits 7a are brought close to each other. That is, the length of the middle connecting portion 7b is made shorter than the length of the left and right connecting portions 7b to narrow the interval between the two slits 7a. As a result, one long slit 7a is formed, and the bag body 2 can be easily separated from the projecting piece 6 even if the bag body 2 is pulled with a light force.

Further, in the above embodiment, the laminate 10 in which a large number of flat packaging bags 1 are superimposed has been described, but it is of course possible to use a single flat packaging bag. That is, the flat packaging bag 1 is formed by folding the left and right sides of a tubular bag body 2 inward to form side gussets 3, and by heat-sealing the bottom of the bag body 2 to form a bottom seal portion 4. A flat bag with side gussets, or a flat bag without side gussets formed by heat-sealing the bottom of a cylindrically formed bag body 2 to form a bottom seal part 4, with an upper end opening on the upper end side of the bag body 2. A portion 5 and a protruding piece 6 protruding upward are formed, and a tear line 7 separating the protruding piece 6 and the bag body 2 is formed between the protruding piece 6 and the vicinity of the upper end of the bag body 2, and the tear line 7 is formed. A locking hole 11 for locking the flat packaging bag is formed above the line 7. The tear line 7 is composed of a slit 7a and a connecting portion 7b, and the length of the connecting portion 7b is The length of the slit is significantly shorter than that 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 employed.

Forming of the bag body 2 of the flat packaging bag 1 is not limited to the inflation process, and may be formed by folding back a sheet-like film and pasting the palms together on the back side.

1 flat packaging bag 2 bag body 3 side gusset 4 bottom seal portion 5 upper end opening 6 projecting piece 7 tear line 7a slit 7b connecting portion 10 laminate 11 hole 13 latching member 14 slanted heat seal portion 15 bottom gusset

Claims (10)

A flat packaging bag formed by folding the left and right sides of a cylindrical bag body inward to form side gussets and heat-sealing the bottom of the bag body to form a bottom seal portion, the bag body comprising: An upper end opening and a projecting piece projecting upward are formed on the upper end side, and a tear line 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 stack of flat packaging bags is constructed by stacking a large number of bags, and the projecting pieces are welded together by forming a hole above the tear line at the overlapped portion of the projecting pieces by a heating means. , the tear line is composed of a slit and a connection part, the length of the connection part is much shorter than the length of the slit, two slits are formed, and the connection parts are formed on both left and right sides of each slit. are respectively formed, the left and right connecting portions are located between the rising portions of the projecting pieces and the slits, and the middle connecting portion is located between the two slits . A flat packaging bag formed by heat-sealing the bottom of a cylindrically formed bag body to form a bottom seal portion, wherein an upper end opening and an upward projecting piece are formed on the upper end side of the bag body. and a tear line 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. The projecting pieces are welded together by forming a hole above the tear line at the overlapped portion of the projecting pieces with a heating means, and the tear line is composed of a slit and a connecting portion, The length of the connecting part is much shorter than the length of the slit, two slits are formed, and connecting parts are formed on both left and right sides of each slit, and the left and right connecting parts are formed with the rising parts of the protruding pieces. A laminated flat bag for packaging , which is positioned between two slits, and a connecting portion in the middle is positioned between two slits . 3. The flat bag laminate for packaging according to claim 1 or 2, wherein the ratio of the length of the connecting portion and the length of the slit is set to 3:7 to 1:9. The bag body is made by blending one or more of high-density polyethylene (HDPE), low-density polyethylene (LDPE), and polypropylene (PP), and further blending the high-density polyethylene (HDPE) and calcium carbonate. The thickness of the polyethylene (PE)-based film is 0.004 mm to 0.05 mm, and the thickness of the polypropylene (PP)-based film is 0.01 mm to 0.05 mm. The flat bag laminate for packaging described in (1). 5. The flat packaging bag laminate according to any one of claims 1 to 4, wherein a bottom gusset is formed by applying an oblique seal from both left and right sides toward the bottom in the lower portion of the bag body. A flat packaging bag formed by folding the left and right sides of a cylindrical bag body inward to form side gussets and heat-sealing the bottom of the bag body to form a bottom seal portion, the bag body comprising: An upper end opening and a projecting piece projecting upward are formed on the upper end side, and a tear line 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 the tear line is formed. A locking hole for locking the flat packaging bag is formed on the upper side of the tear line, 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. Two slits are formed, and connecting portions are formed on both left and right sides of each slit. A flat packaging bag positioned between two slits . A flat packaging bag formed by heat-sealing the bottom of a cylindrically formed bag body to form a bottom seal portion, wherein an upper end opening and an upward projecting piece are formed on the upper end side of the bag body. A tear line 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 hole is formed, the tear line is composed of a slit and a connection part, the length of the connection part is formed much shorter than the length of the slit, and the connection parts are formed on both left and right sides of each slit. The left and right connecting parts are positioned between the rising parts of the projecting pieces and the slits, and the central connecting part is positioned between the two slits . 8. The flat packaging bag according to claim 6 , wherein the ratio of the length of the connecting portion and the length of the slit is set to 3:7 to 1:9. The bag body is made of a film blended with one or more of high density polyethylene (HDPE), low density polyethylene (LDPE), and polypropylene (PP), and further blended with the high density polyethylene (HDPE) and calcium carbonate. The thickness of the polyethylene (PE)-based film is 0.004 mm to 0.05 mm, and the thickness of the polypropylene (PP)-based film is 0.01 mm to 0.05 mm. 9. The flat packaging bag according to any one of 8 . 10. The flat packaging bag according to any one of claims 6 to 9 , wherein a bottom gusset is formed by applying an oblique seal from both left and right sides toward the bottom in the lower portion of the bag body.

Images