JP2001225849A - Bag and filling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gusset type flat-bottomed bag which makes it possible to see contents through the bag while permitting lightproofness or a design effect not to be deteriorated as much as possible, which is allowed to be held in a self-supporting state on a table or the like while the contents are being kept in it after it is unsealed, and which is conveniently used as a container until the contents are used up. SOLUTION: Since a pair of plane portions constituting a fore and a rear walls of the gusset type flat-bottomed bag are opaque or semitransparent, lightproofness and/or a design effect of the bag is not so deteriorated. Since at least one region of a pair of gusset parts constituting both side walls of the bag is transparent, contents can be seen therethrough. An upper end of this bag is sealed and, when each plane portion and a folding piece of each gusset part, which is adjacent to the corresponding plane portion, are superposed on each other and are fixed together at a place lower than a position where the upper end of the bag is unsealed, the bag has excellent shape retention when the upper end thereof is unsealed, and has excellent self-supporting properties even after it is unsealed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat bottom bag, that is, a bag having a flat bottom surface which stands up with contents therein.

[0002]

2. Description of the Related Art Bags made of a flexible film material and having flat bottom and side gussets are known. Such a gusset type flat bottom bag and a method for manufacturing the same are disclosed in, for example, JP-A-7-314587 and JP-A-11-91013.

FIG. 18 shows an example (300) of a conventionally known gusset type flat bottom bag. The flat bottom bag body 300 includes a pair of flat portions 301 and 302 forming front and rear walls of the bag, a pair of gusset portions 303 and 304 forming both side walls of the bag, and a flat bottom portion 30.
5 and an opening 306 whose upper end is open.
Each gusset portion is folded in a fold shape so as to protrude toward the inside of the bag, and fold pieces 303a, 304a connected to the front wall and rear portions are formed by fold lines 303c, 304c extending in the height direction of the bag. Folding piece 3 connected to the wall
03b and 304b are defined. Such a gusset-type flat bottom bag is formed of a flexible film.
05 becomes flat and can be self-supporting.

[0004] When contents that require or are desired to be shielded from light are stored or filled in a gusset-type flat bottom bag, the bag is formed of a film having light-shielding properties. However, if the contents are put into a bag formed of a light-shielding film and sealed, the contents cannot be seen through and checked. The same applies when printing is performed on the entire outer surface of the bag with priority given to the design of the bag, and the contents cannot be seen through.

After the upper end of the gusset-type flat bottom bag is opened, the bag is opened and allowed to stand on a table or the like, and the contents are taken out little by little whenever necessary. There are cases. For example, a flat bottom bag in which a plurality of elongate small bags of coffee sugar are put and sealed is often used in this way. If the gusset type flat bottom bag used in this way is formed of a film that cannot be seen through,
If you look into the opening of the bag that is opened and set up on a table etc., you can see the contents visually, but it is inconvenient, and if the upper opening is resealed with a zipper that can be opened, It is also inconvenient because it is necessary to open the resealing means of the opening each time to check the contents.

Further, when the gusset type flat bottom bag is filled with the contents and sealed, and then the upper end is opened,
Because the area around the opening formed at the top of the bag is too flexible,
It is difficult to keep the shape of the opening always constant. In particular, when a plurality of slender solids such as slender small bags of coffee sugar are stored in the flat bottom bag body, the content is reduced, the independence becomes unstable, and the bag tends to fall. In addition, when the flat bottom bag is filled with fluid contents such as liquid or powder, the shape of the opening changes during the work of injecting the contents by tilting the bag. The direction of pouring out is off and the contents are easy to spill.

Even if the upper end of the gusset type flat bottom bag is opened, a film having a certain degree of rigidity is used or the dimensional balance is adjusted if the bag is kept in a state of being gently self-standing. The shape of the opening is kept constant by forming the bag body by performing such a method. However, as described above, when the content of such a flat bottom bag is reduced and the load is uneven, the opening of the bag becomes unstable, and there is a problem that the independence is lost.

[0008]

SUMMARY OF THE INVENTION The present invention has been accomplished in view of the above circumstances, and a first object of the present invention is to provide a gusset capable of seeing through contents without impairing light-shielding properties or design as much as possible. An object of the present invention is to provide a flat bottom bag of a type.

A second object of the present invention is to maintain the independence to the end even if the contents are taken out a plurality of times by a required amount after being opened on a table or a shelf after opening, and It is an object of the present invention to provide a gusset-type flat bottom bag body in which the remaining amount of the gusset can be easily confirmed.

[0010]

The bag provided in the present invention is formed of a flexible film, and comprises a pair of flat portions forming the front wall and the rear wall of the bag, and both side walls of the bag. A bag body comprising a pair of gussets folded in a fold shape toward the inside of the bag, and a flat bottom portion, wherein the pair of flat portions are opaque or translucent, and the gusset portion Is characterized in that at least one region is transparent.

In the present invention, a pair of flat portions of the gusset type flat bottom bag body, that is, a front wall and a rear wall,
Since it is a part that is easily exposed to light rays from the outside and is conspicuous in appearance, it is formed of an opaque or translucent flexible film such as a light-shielding film giving priority to securing light-shielding properties or a printing film giving priority to improving designability. In addition, since the pair of gusset portions of the flat bottom bag body are less susceptible to light irradiation than the flat portion and are inconspicuous in appearance, a film having a transparent film or a transparent portion with priority on the visibility of the contents. Formed. Therefore, even if the light-shielding property and / or the design property of the bag is slightly sacrificed, it is not so much impaired, and the contents can be seen through.

In the bag of the present invention, the pair of gusset portions may be formed of a transparent film. When the entire gusset portion is transparent, the visibility of the contents is improved.

The bag according to the present invention includes the pair of flat portions,
Along with the pair of gussets and the flat bottom portion, further comprising a sealed upper end, and when the upper end is opened to form an opening, at the upper end of the inner peripheral portion of the opening. Opposite to each other, between the inner surface of at least one flat portion of the front wall and the rear wall and the inner surface of each gusset portion on both sides, so as not to open between the flat portion and each gusset portion adjacent to the flat portion. The two may be fixed at a position lower than the upper end by overlapping the folded pieces.

When the upper end portion of the bag body according to this aspect is opened above a position where the flat portion and the folded piece of each gusset portion adjacent to the flat portion are fixed, a formed opening is formed. Has excellent shape retention. Since the shape of the opening is excellent, the load balance of the contents fluctuates while the bag is opened on a table or shelf after opening, and the contents are taken out little by little multiple times. Even if it is difficult to fall down, it is hard to spill even if the fluid content is repeatedly poured out from the opening at the upper end of the bag. In addition, this bag allows the remaining contents to be seen through the gusset portion, does not impair the light-shielding property so much, and has a good design when stand alone in a conspicuous place such as a table. is there.

Therefore, the bag body belonging to this embodiment can be used not only as a package at the time of distribution but also as a container until the contents can be completely taken out after being opened and made to stand alone on a table or the like with the contents kept therein. It is very convenient.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A bag according to the present invention will be described below with reference to the drawings. First, the bag body belonging to the first aspect of the present invention is formed of a flexible film, and has a pair of flat portions forming the front wall and the rear wall of the bag, and forming both side walls of the bag and forming the inner side of the bag. And a flat bottom surface portion, wherein at least one region of the gusset portion is transparent.

FIG. 1 shows an example (10) of a bag according to the present invention.
1) is shown. The bag body 101 is formed of a flexible film, and has a pair of flat portions forming a front wall 1 and a rear wall 2 of the bag, and a pair of gusset portions 3 and 4 forming both side walls of the bag.
And a flat bottom portion 5 and an opening 6 having an open upper end. The gusset parts 3, 4 are folded in a fold shape toward the inside of the bag, and are divided by folding lines 3c, 4c extending in the height direction of the bag, and the folding pieces 3a,
3b, 4a and 4b are defined. The bag body 101 has a structure in which peripheral portions 7 where films constituting each part of the bag are abutted to each other are joined by a method such as heat sealing.
A part of the gusset part and the bottom part may be defined.

The front wall 1 and the rear wall 2 of the bag 101 are made of an opaque or translucent flexible film such as a light-shielding film having an aluminum foil layer or a film entirely printed with opaque ink. It is formed with. on the other hand,
The pair of gusset parts 3, 4 are formed of a transparent film that allows the contents to be seen through. The pair of gusset portions may be formed of a film having a partially transparent area.

FIG. 2 shows a bag 102 obtained by putting the contents into the bag 101 and sealing the opening at the upper end. In the bag body 102, a pair of flat portions, that is, the front wall 1 and the rear wall 2 are easily exposed to light rays from the outside and are conspicuous portions in appearance. It is formed of an opaque or translucent flexible film such as a film which is preferentially printed on the entire surface, and the pair of gusset parts are less susceptible to light irradiation than the flat part and have an appearance. Since it is an inconspicuous part, it is formed of a transparent film giving priority to the visibility of the contents. Therefore, even if the light-shielding property and / or the design property of the bag are slightly sacrificed, the bag body 102 is not significantly impaired, and the contents can be seen through.

The flexible film for forming the flat portion of the bag according to the present invention may be any film material selected according to the contents to be filled and the product form as long as it is opaque or translucent. May be used. For example, a plastic film such as biaxially oriented polyester or biaxially oriented polypropylene or a paper such as a high-quality paper of about 52.3 g / m ² is used as a base material, and the same or different kinds of plastics or papers are laminated, or an aluminum foil is used. A composite film in which a layer having a particularly high barrier property such as a metal foil layer such as an aluminum oxide layer or a vapor-deposited layer such as an aluminum oxide layer can be used.

In particular, when it is desired to package foods and chemicals requiring light-shielding properties, gas barrier properties, and water vapor barrier properties, a composite film comprising a plastic film laminated with an aluminum foil layer or a light-shielding metal vapor-deposited layer is used. It is preferable to form a part. Specifically, from the outer surface side to the inner surface side of the bag body, polyethylene terephthalate (PET)
(Thickness 12 μm) / polyethylene (thickness 15 μm) / aluminum foil (thickness 7 μm) / polyethylene (thickness 30)
μm) or aluminum vapor-deposited PET (thickness 12 μm) / polyethylene (thickness 15 μm)
m) / Unstretched polypropylene (CPP) (thickness 30μ)
m) can be exemplified.

On the other hand, as the flexible film for forming the gusset portion of the bag according to the present invention, as long as at least one area is transparent, any flexible film is selected according to the contents to be filled and the form of the product. A film material may be used.
For example, a transparent vapor-deposited film in which a silicon oxide (SiO _x ) or aluminum oxide (Al ₂ O ₃ ) vapor-deposited film is provided on a substrate film such as PET (polyethylene terephthalate) has transparency and barrier properties. Is preferable because it easily opens when used as a gusset part. More specifically, a silicon oxide-based deposited PET (thickness: 12 μm) /
A composite film having a layer configuration composed of polyethylene (thickness 15 μm) / unstretched polypropylene (CPP) (thickness 30 μm) can be exemplified.

In the present invention, in order to give priority to the light shielding property or the design property of the bag as much as possible, it is sufficient that at least one region of either the right or left gusset portion is transparent. When it is desired to make only one area of the gusset part transparent, for example, a film made of vapor-deposited PET in which a vapor-deposited film of aluminum-deposited PET is partially removed, or a composite having such a partially transparent aluminum-deposited PET layer Use a film.

Since the bottom of the bag according to the present invention is less susceptible to light irradiation and less noticeable in appearance than the flat part, unlike the flat part, there is little need to make it opaque or translucent. Further, since the bottom portion is not a portion suitable for seeing through the contents, it is not necessary to be transparent unlike the gusset portion. Therefore, the bottom portion may be formed using any flexible film, but if the bottom portion is formed using a transparent vapor-deposited film used to form a gusset portion, the bottom surface is formed when the contents are put in a bag. This is preferable because the portion is easily opened and the barrier property is good.

The bag 103 shown in FIG.
01, but a pair of gussets 3, 4
Are all formed of partially transparent films. Each gusset portion is formed of a light-shielding film or a printed film, and transparent portions 3d and 4d that are narrower than the width of the gusset portion are provided from the upper end to the lower end of the bag. Even when the gusset part is made partially transparent, by providing a transparent part from the upper end to the lower end of the bag, the degree of reduction of fluid contents such as powder and liquid after opening is completed. You can see it.

The bag 104 shown in FIG.
01, but a pair of gussets 3, 4
Are all formed of partially transparent films. Each gusset portion is formed of a light-shielding film or a printed film, and narrow transparent portions 3d and 4d crossing the gusset portion from the joint with the front wall to the joint with the rear wall. The transparent portion 3d of the gusset portion 3 is not shown in the drawing. Even when the gusset part is made partially transparent, by providing a transparent portion in the horizontal direction of the bag body, after opening, the number of elongated solid contents, for example, the remaining number of elongated small bags of coffee sugar, can be reduced. You can keep checking until the end.

Next, the bag belonging to the second embodiment of the present invention is:
A pair of flat portions, which are formed of a flexible film and form the front wall and the rear wall of the bag, are formed by folding both sides of the bag and folded inward toward the inside of the bag. A bag body having a pair of gusset portions having a folding piece, a flat bottom portion, and a sealed upper end portion, wherein the pair of flat portions is opaque or translucent, and at least one of the gusset portions is provided. The region is transparent, and, when the upper end is opened to form an opening, when facing at the upper end of the inner peripheral portion of the opening, the inner surface of at least one flat portion of the front wall and the rear wall. Make sure that there is no gap between the inner surfaces of the gussets on both sides.
The flat portion and the folded pieces of each gusset portion adjacent to the flat portion are overlapped with each other and are fixed at a position below the upper end portion.

FIG. 5 shows an example (105) of such a bag. The bag 105 is shown in FIG.
5A shows an example (201) of an intermediate product obtained during the production of the bag body 105 to facilitate understanding of the bag body 105.

The bag 201 of the intermediate product shown in FIG.
Is exactly the same as the bag body 101 shown in FIG. 1, and includes a pair of flat portions forming the front wall 1 and the rear wall 2 of the bag, and gusset portions 3 and 4 forming both side walls of the bag. The bottom part 5,
An opening 6 having an open upper end is provided, a pair of flat portions are formed of an opaque or translucent film, and a pair of gusset portions are formed of a transparent film.

The bag 105 shown in FIG.
A, while sealing the opening 6 of the bag body 201 shown in FIG. 1A by a method such as heat sealing, the back wall 2 and the folded pieces 3b, 4b of each gusset portion adjacent to the back wall are overlapped,
The superposed surfaces of the two are bonded by heat sealing at a position below the upper end to be unsealed to form a bonded portion 8.

FIG. 6 shows a state in which the upper end of such a bag body 105 is opened (105 '). When the bag body 105 is torn at a position above the bonding portion 8 and the upper end portion 9 is removed,
The opening 10 is formed with the bonding portion 8 remaining. Accordingly, the inner surface 2 (i) of the rear wall 2 facing the upper end of the inner peripheral portion of the opening 10 (see FIG. 5A) and the inner surfaces 3b (i), 4b (i) of the gussets 3, 4 on both sides. ) (See FIG. 5A), the back wall 2 and the folded pieces 3b, 4b of each gusset portion adjacent to the back wall can be fixed by the adhesive portion 8 so that the back wall 2 is not opened. The mouth 10 shows excellent shape retention.

Since the bag body 105 is excellent in shape retention of the opening, the load balance of the contents fluctuates while the contents are taken out a plurality of times by a required amount after being opened on a table or a shelf after opening. However, the shape of the opening of the bag and the shape of the entire bag are hard to change. Therefore, for example, the bag 10
Even if a plurality of slender pouches such as coffee sugar are stored in 5 and one by one is taken out, independence is not lost to the end. In addition, even if the bag 105 is filled with a fluid content such as liquid or powder, and the content is poured out in small quantities, the outflow direction is stable, and the content is Can be taken out without spilling.

In addition, the flat portion of the bag 105 is opaque or translucent in order to secure light-shielding properties and / or improve design, but the gusset portion is transparent, and the contents can be seen through the gusset portion. Since the contents can be taken out little by little, the remaining amount can be easily checked while using.

In the bag body 105, the rear wall 2 and the folding pieces 3b and 4b of the gussets adjacent to the rear wall are fixed, but the front wall 1 and the gussets adjacent to the front wall are also fixed. The folding pieces 3a and 4a may be fixed in the same manner.

In the bag body 105, the rear wall 2, which is a plane portion, and the folded pieces 3b, 4b of the gussets adjacent thereto are bonded and fixed by heat sealing. It may be fixed by a method. For example,
The inner surface of the flat portion and the inner surface of each gusset portion facing this may be bonded via an adhesive. Further, as described later, a through hole is provided in the gusset portion, and the inner surface of the front wall and the inner surface of the rear wall facing each other through the through hole are joined by a method such as heat sealing, so that the flat portion is adjacent to the flat portion. The folded piece of the gusset part to be formed may be fixed.

In the bag body 105, the rear wall 2 and each of the folded pieces 3b and 4b are formed at a height very close to the sealed upper end, and the overlapping surface of the two is placed in the horizontal direction of the bag. It is fixed throughout. However, in the present invention, the gap between the inner surface of at least one flat portion of the front wall and the rear wall and the inner surface of each gusset portion on both sides facing each other at the upper end of the inner peripheral portion of the opening is the side of the bag body. If it can be prevented from opening from the edge, the flat part and the gusset part may be fixed at a position considerably below the upper end part, or without fixing over the entire horizontal direction of the bag, It may be fixed only in some areas. When the flat portion and the gusset portion are fixed at a position considerably below the upper end of the bag body or in an area extending only partially in the horizontal direction, the inner surface of the flat portion at the upper end of the inner peripheral portion of the opening is opened. A slight gap may be formed between the gusset portion and the inner surface of the gusset portion facing the gusset portion. However, even in such a case, it is prevented that the space between the flat portion and the gusset portion facing the flat portion is completely opened from the side edge portion of the bag body, so that the shape retention of the opening is improved. Can be.

In the bag of the present invention, at least one of the front wall and the rear wall and the gussets on both sides are fixed, and the upper end of the bag is opened to form an opening. When doing, so that the gap between the outer surfaces of the gusset portions on both sides facing each other at the upper end of the outer peripheral portion of the opening is not opened, the folded pieces of each gusset portion are overlapped with each other, and Both may be fixed in position.

FIG. 7 shows an example (106) of such a bag. The bag 106 is shown at 7B in FIG.
7A shows an example (201) of an intermediate product obtained during the production of the bag 106 in order to facilitate understanding of the bag 106.

The intermediate product bag 201 shown in FIG.
Is exactly the same as the bag body 101 shown in FIG. The bag 106 shown in FIG. 7B is the bag 201 shown in FIG. 7A.
And has a structure in which an adhesive portion 8 is formed at a position below the sealed upper end portion 9. The bonding portion 8 of the bag body 106 overlaps the rear wall 2 with the folded pieces 3b and 4b of each gusset portion adjacent to the rear wall, and also folds the gusset portions 3 and 4, that is, the folded pieces 3a, 3b and the folded pieces 4a and 4b are overlapped, and their respective overlapping surfaces are bonded by heat sealing at a position below the sealed upper end portion 9.

FIG. 8 shows a state in which the upper end of such a bag 106 is opened (106 '). The bag 106 is bonded to the bonding portion 8
When the upper end 9 is removed by tearing at a position higher than the above, an opening 10 is formed with the adhesive portion 8 remaining. Therefore, the inner surface 2 (i) of the rear wall 2 facing the upper end of the inner peripheral portion of the opening 10 (see FIG. 7A) and the inner surfaces 3b (i), 4b (i) of the gusset portions 3, 4 on both sides. ) (See FIG. 7A), the rear wall 2 and the folded pieces 3b, 4b of each gusset portion adjacent to the rear wall can be fixed by the bonding portion 8 so as not to open. , Opening 10
The outer surfaces of the gusset portions on both sides that face each other at the upper end of the outer peripheral portion of the outer surface 3a (o), 3b (o) and the outer surfaces 4a (o), 4b (o) (see FIG. 7A).
The fold pieces of each gusset portion, that is, the fold pieces 3a and 3b and the fold pieces 4a and 4b can be fixed to each other by the bonding portion 8 so that the gap does not open. Therefore, in the bag 106, the bag 1
As in 05, the opening 10 shows excellent shape retention and allows the contents to be seen through each gusset.

In the bag of the present invention, when the sealed upper end portion is opened to form an opening, each gusset on the inner surface of the front wall and both sides facing each other at the upper end of the inner peripheral portion of the opening. Between the outer surfaces of the gusset portions facing each other at the upper end of the outer peripheral portion of the opening, and the rear wall facing each other at the upper end of the inner peripheral portion of the opening. Between the inner surface and the inner surface of each gusset part on both sides, the front wall, the folded piece of each gusset part, and the rear wall are overlapped with each other so as not to open, and May be fixed.

FIG. 9 shows an example (107) of such a bag. The bag 107 is shown at 9B in FIG.
9A shows an example (201) of an intermediate product obtained during the production of the bag 107 in order to facilitate understanding of the bag 107.

The intermediate product bag 201 shown in FIG.
Is exactly the same as the bag body 101 shown in FIG. The bag 107 shown in FIG. 9B is the same as the bag 201 shown in FIG. 9A.
And has a structure in which an adhesive portion 8 is formed at a position below the sealed upper end portion 9. The bonding portion 8 of the bag body 107 overlaps the rear wall 2 with the folded pieces 3b, 4b of the gusset portions adjacent to the rear wall, and the folded pieces of the gusset portions 3, 4, ie, the folded pieces 3a. , 3b and the folded pieces 4a and 4b are overlapped, and the front wall 1 and the folded pieces 3a and 4a of each gusset portion adjacent to the front wall are overlapped, and their respective overlapping surfaces are sealed. It is formed by bonding by heat sealing at a position below the upper end 9.

FIG. 10 shows a state in which the upper end of such a bag 107 is opened (107 '). When the bag 107 is torn at a position above the bonding portion 8 and the upper end 9 is removed,
The opening 10 is formed with the bonding portion 8 remaining. Therefore, the inner surface 2 (i) of the rear wall 2 facing the upper end of the inner peripheral portion of the opening 10 (see FIG. 9A) and the inner surfaces 3b (i), 4b (i) of the gussets 3, 4 on both sides. ) (FIG. 9A)
The rear wall 2 and the folded pieces 3b and 4b of each gusset portion adjacent to the rear wall can be fixed by the bonding portion 8 so that the opening between the rear wall 2 and the opening 1 is not opened.
The outer surfaces of the gussets on both sides facing each other at the upper end of the outer peripheral portion of the outer surface 3a, ie, the outer surfaces 3a (o), 3b (o) and the outer surfaces 4a (o), 4b (o) (see FIG. 9A). The fold pieces of each gusset portion, that is, the fold pieces 3a and 3b and the fold pieces 4a and 4b can be fixed to each other by the adhesive portion 8 so that the gap is not opened. Inner surface 1 (i) of front wall 1 facing at the upper end of the inner peripheral portion (see FIG. 9A)
And inner surfaces 3a (i), 4a of the gusset portions 3, 4 on both sides
(I) The front wall 1 and the folded pieces 3 of each gusset portion adjacent to the front wall so as not to open between them (see FIG. 9A).
a and 4 a can be fixed by the bonding portion 8. Therefore, in the bag body 107, similarly to the bag body 105, the opening 10 exhibits excellent shape retention properties, and the contents can be seen through each gusset portion.

In the bag 107, the bonding portion 8
However, since it is formed only in the area near both side edges of the overlapping surface of the front wall, the folded piece and the rear wall, when the upper end is opened, between the front wall and the folded piece adjacent thereto, and
A slight gap may be formed between the back wall and the adjacent fold. However, as described above, even when the area of the bonding portion 8 extends only partially in the horizontal direction of the bag, the gap between the flat portion and the inner surface of the gusset portion facing the flat portion is the side of the bag. Since the situation of completely opening from the edge is prevented, the shape retention of the opening can be improved.

FIG. 11 shows another example (108) in which the front wall of the bag, the folded pieces of each gusset portion, and the rear wall are all overlapped and fixed. The bag 108 is shown in FIG. 11B, and FIG. 11A shows an example of an intermediate product obtained during the production of the bag 108 in order to facilitate understanding of the bag 108. (202) is shown. Note that FIG.
In A, a part of the front wall 1 is cut away.

The bag 20 of the intermediate product shown in FIG.
2 has almost the same configuration as the bag body 101 shown in FIG.
a, 3b, 4a, and 4b, the inner surface 1 (i) of the front wall and the rear wall are positioned slightly lower than the height at which the bag 108 obtained by sealing the bag is torn when the bag is opened. Inner surface 2 (i)
Are provided with through holes 11, 12, 13 and 14. Then, the bonding portion 8 is formed by bonding the inner surface of the front wall and the inner surface of the rear wall through the through hole (see FIG. 11B).

The bag 108 shown in FIG. 11B seals the opening 6 of the bag 202 shown in FIG.
02, on the outer surface of the front wall and on the outer surface of the rear wall, there is provided opening guidance means 15 that crosses horizontally at a height that is torn when the bag is opened, and a notch 16 is provided at one end of the opening guidance means 15.
Further, it is formed by bonding the inner surface of the front wall and the inner surface of the rear wall through the through holes 11, 12, 13, and 14 at a position slightly lower than the opening guidance means 15.

The opening guide means 15 is provided with two tapes 15a, 15a on the outer surface of the front wall and on the outer surface of the rear wall of the bag, respectively.
b side by side next to each other and aligned horizontally from one side edge of the bag to the other side edge,
Glue it. The boundary 15c between adjacent tapes bonded to the outer surface of the front wall of the bag and the boundary (not shown) between adjacent tapes bonded to the outer surface of the rear wall of the bag just overlap. Is aligned with In addition, a notch 16 is provided on one side edge of the flat portion of the bag body,
The apex of the notch 16 is connected to one end of a boundary 15c between adjacent tapes. When the bag starts to be torn from the notch 16, the bag can be torn along the boundary 15c between the adjacent tapes constituting the opening guidance means, and a clean opening can be formed.

As the tape forming the opening guide means 15, for example, a plastic film having a layer made of a polyolefin film such as polyethylene or a polyester film such as polyethylene terephthalate can be used. Such plastic films are
It may be a single layer or a multilayer, or may have a layer made of a material other than plastic. A pressure-sensitive adhesive tape with a pressure-sensitive adhesive layer on the surface of the tape, or a heat-sensitive adhesive tape with a heat-sensitive adhesive layer on the tape surface,
Glue to the front and / or back wall of the bag.

As a pressure-sensitive adhesive tape, for example, OP
Alternatively, an adhesive tape having a width of about 7 mm in which a layer of a pressure-sensitive adhesive is provided on the surface of a substrate made of PET can be used. On the other hand, as a heat-sensitive adhesive tape, for example, PE
(20 μm) / PET (16 μm) / PE (20 μm)
m) or CP (20 μm) / DL / PET (16
μm) / DL / CP (20 μm) or the like and a plastic tape having a width of about 7 mm can be used. Here, PE is polyethylene, PET is polyethylene terephthalate, OP is expanded polypropylene, CP
Represents a non-stretched polypropylene, and DL represents a dry laminate layer. The numerical value in parentheses is the thickness of each layer.

FIG. 12 shows a state in which the upper end of the bag body 108 is opened (108 '). The bag 108 is moved by the notch 16 to the boundary 15 of the opening guidance means 15.
When tearing along c, the upper end 9 is removed, but the opening 10 is formed while the adhesive portion 8 remains. The gusset portions 3 and 4 are provided between the front wall 1 and the rear wall 2 by the bonding portion 8.
Are folded and pressed down, the parts are secured to one another such that their respective overlapping surfaces do not open at the upper end of the opening.

In this example, between the front wall 1 and the folded pieces 3a and 4a adjacent thereto, between the folded pieces 3a and 3b of the gusset part 3, and between the folded pieces 4a and 4b of the gusset part 4. Neither is bonded between the rear wall 2 nor between the folded pieces 3b and 4b adjacent to the rear wall. Further, the bonding portion 8 of the bag 108 is formed only in the portion of the through hole. Therefore, when the upper end of the bag body 108 is opened, a slight gap may be formed between the front wall and the folded piece adjacent thereto and between the rear wall and the folded piece adjacent thereto. However, as described above, the gap between the flat portion and the inner surface of the gusset portion facing the flat portion is
Since the situation of completely opening from the side edge of the bag body is prevented, the shape retention of the opening can be improved. Therefore, in the bag body 108, similarly to the bag body 105, the opening 10 exhibits excellent shape retention, and the contents can be seen through each gusset portion.

The bag of the present invention as described above can be manufactured by a known method for producing a gusset type flat bottom bag. For example, the bag 101 described above
(FIG. 1) can be manufactured by the following method.
That is, first, an opaque or translucent film forming a pair of flat portions 1 and 2 and a transparent film forming a pair of gusset portions 3 and 4 are prepared, and their side edges 17 are heat sealed or the like. Then, the bag body 18 as shown in FIG. 13 is formed. Next, as shown in FIG. 14, a square-shaped bottom surface forming sheet 5 'is prepared, and this is folded back at the center line to form a bottom folding line 19. Is formed by folding the first bottom fold line 19 from the base point P, P to the bottom end of the bottom-formed sheet in the opposite direction to the original fold direction at both ends. At the same time, the lines connecting the four corners at the two ends of the bottom portion forming sheet 5 'or the vicinity thereof to the base points P and P are folded as four ridge lines 20 protruding inwardly of the bag to form folds on the side surfaces of the bag. Corresponding bottom forming sheet opening surfaces 21a, 21
b, 21c and 21d are formed.

Next, as shown in FIG. 15, the folding lines 19 ', 19' of the bottom forming sheet 5 'are aligned with the folding lines 3c, 4c of the gusset portions 3, 4 of the bag body 18. The bottom forming sheet 5 ′ is inserted into one opening of the bag body 18. Next, as shown in FIG.
A heat plate is pressed against a portion where the peripheral edge of the opening on the side to be the bottom and the opening surface of the bottom forming sheet are overlapped to form a heat seal portion 22, and the two are joined. After joining the two, if there is an overhang 23 of the bottom forming sheet 5 ′, this is cut off along the line F. The films forming the pair of flat portions 1 and 2 and the pair of gusset portions 3 and 4 and the bottom forming sheet 5 ′ are overlapped so as to have a predetermined positional relationship, and a side seal of the bag body is formed. The portion and the bottom seal portion between the bag body and the bottom forming sheet may be heat-sealed at the same time. Thus, the bag 101 as shown in FIG. 1 is obtained.

When the above-mentioned bag 108 (FIG. 11B) is to be manufactured, it can be manufactured by the following method. That is, first, as shown in FIG. 17, an opaque or translucent film constituting a pair of flat portions, a transparent film constituting a pair of gusset portions, and a bottom forming sheet 5 ′ as shown in FIG. Prepare Here, the films 1 ′ and 2 ′ for plane portions are provided at positions on the side that will be the upper ends of the bags, which are lower than the portions that are joined to other films when the upper ends of the bags are sealed. Book tape 1
5a and 15b are arranged side by side next to each other, and are positioned in the horizontal direction from one side edge to the other side edge of the bag, and are bonded to each other to provide the opening guidance means 15. On the other hand, the gusset portions are folded into the gusset portion films 3 ′ and 4 ′ at a position that is the upper end of the bag and is lower than the opening inducing means 15 when the upper end of the bag is sealed. Occasionally, through holes 11, 12, 13, 14 are formed to allow the inner surface of the front wall and the inner surface of the rear wall of the bag body to come into contact.

Then, by the steps as shown in FIGS. 13, 15 and 16, the butted peripheral portions of the respective films are joined by a method such as heat sealing, and the bag of the intermediate product whose upper end portion is opened. Form the body.

An adhesive portion 8 (see FIG. 12) is formed so that the space between the front wall 1, each gusset portion 3, 4 and the rear wall 2 does not open at the upper end of the bag when the bag 108 is opened. Need to be fixed. The bonding portion 8 can be formed simultaneously with the heat sealing portion at the peripheral portion at the stage of forming the bag of the intermediate product. It is preferable that the bonding portion 8 is formed before the filling step, because the bag exhibits excellent shape retention in the filling step and the failure of filling is reduced. Alternatively, the bonding portion 8 of the bag 108 may be formed simultaneously with the heat sealing portion at the upper end in the step of sealing the upper end of the bag after filling the contents of the bag of the intermediate product.

The notch 16 of the bag 108 can be placed at any stage after the formation of the bag body.
1 between the tapes 15a and 15b whose vertices are adjacent to each other
5c is formed so as to be continuous with one end. Thus, the bag 108 according to the present invention is obtained.

[0060]

As described above, according to the first aspect of the present invention, the pair of flat portions, that is, the front wall and the rear wall of the gusset type flat bottom bag are easily exposed to light rays from the outside. The flat bottom bag body is made of an opaque or translucent flexible film such as a light-shielding film that prioritizes securing of light-shielding properties or a print film that prioritizes improvement of design properties because it is a part that is conspicuous in appearance. The pair of gusset portions are less susceptible to light irradiation than the flat portion and are inconspicuous in appearance. Therefore, the gusset portions are formed of a transparent film or a film having a transparent portion with priority given to the visibility of the contents. Therefore, even if the light-shielding property and / or the design property of the bag is slightly sacrificed, it is not so much impaired, and the contents can be seen through.

According to the second aspect of the present invention, the pair of flat portions of the gusset type flat bottom bag are formed of an opaque or translucent film, and the gusset portion is formed of a film in which at least one region is transparent. Formed. Further, when the sealed upper end of the flat bottom bag is opened to form an opening, at least one flat portion of the front wall and the rear wall facing each other at the upper end of the inner peripheral portion of the opening. The flat portion and the folded piece of each gusset portion adjacent to the flat portion are overlapped with each other so that the inner surface of the gusset portion and the inner surface of each gusset portion on both sides are not opened. Is fixed.

When the upper end portion of the bag body belonging to the second aspect is opened above a position where the flat portion and the folded pieces of the gusset portions adjacent to the flat portion are fixed,
The formed opening is excellent in shape retention. Since the shape of the opening is excellent, the load balance of the contents fluctuates while the bag is opened on a table or shelf after opening, and the contents are taken out little by little multiple times. Even if it is difficult to fall down, it is hard to spill even if the fluid content is repeatedly poured out from the opening at the upper end of the bag. In addition, this bag allows the remaining contents to be seen through the gusset portion, does not impair the light-shielding property so much, and has a good design when stand alone in a conspicuous place such as a table. is there.

Therefore, the bag belonging to the second embodiment is used not only as a package at the time of distribution but also as a container until the contents are completely taken out after being opened and left standing on a table or the like with the contents still contained. It is very convenient.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example (101) of a bag according to the present invention.

FIG. 2 is a perspective view showing an example (102) of a bag according to the present invention.

FIG. 3 is a perspective view showing an example (103) of the bag according to the present invention.

FIG. 4 is a perspective view showing an example (104) of a bag according to the present invention.

FIG. 5 is a perspective view showing an example (105) of the bag according to the present invention. FIG. 5A shows an example (201) of an intermediate product obtained during the production of the bag 105, and FIG. 5B shows the bag 105 according to the present invention.

FIG. 6 is a perspective view showing a state in which an example (105) of the bag body according to the present invention is opened.

FIG. 7 is a perspective view showing an example (106) of the bag according to the present invention. FIG. 7A shows an example (201) of an intermediate product obtained during the production of the bag 106, and FIG. 7B shows the bag 106 according to the present invention.

FIG. 8 is a perspective view showing a state where an example (106) of the bag body according to the present invention is opened.

FIG. 9 is a perspective view showing an example (107) of the bag according to the present invention. FIG. 9A shows an example (201) of an intermediate product obtained during the production of the bag 107, and FIG. 9B shows the bag 107 according to the present invention.

FIG. 10 is a perspective view showing a state where an example (107) of the bag body according to the present invention is opened.

FIG. 11 is a perspective view showing an example (108) of the bag according to the present invention. FIG. 11A shows an example (202) of an intermediate product obtained during the production of the bag 108, and FIG.
Shows a bag 108 according to the present invention.

FIG. 12 is a perspective view showing a state in which an example (108) of the bag body according to the present invention is opened.

FIG. 13 is a view for explaining one step of the method for manufacturing a bag according to the present invention.

FIG. 14 is a view for explaining one step of a method for manufacturing a bag according to the present invention.

FIG. 15 is a view for explaining one step of a method for manufacturing a bag according to the present invention.

FIG. 16 is a view for explaining one step of a method for manufacturing a bag according to the present invention.

FIG. 17 is a view for explaining one step of the method for manufacturing a bag according to the present invention.

FIG. 18 is a perspective view showing a conventional gusset type flat bottom bag.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Front wall 2 Rear wall 3, 4 Gusset part 5 Bottom part 6 Opening part 7 Perimeter part 8 Adhesion part 9 Sealed upper end part 10 Opening opening 11, 12, 13, 14 Through hole 15 Opening guidance means 16 Notch 17 side Edge 18 Bag body 19 Bottom fold line 20 Ridge 21a, 21b, 21c, 21d Bottom forming sheet open surface 22 Heat seal portion 23 Overhang portion

Claims (3)

[Claims] 1. A pair of flat portions which are formed of a flexible film and form a front wall and a rear wall of a bag, and which are formed on both side walls of the bag and are folded inward toward the inside of the bag. A bag body comprising a pair of gusset portions and a flat bottom portion, wherein the pair of flat portions is opaque or translucent, and at least one region of the gusset portion is transparent. body. 2. The bag according to claim 1, wherein the pair of gussets are formed of a transparent film. 3. The apparatus according to claim 1, further comprising a sealed upper end together with the pair of flat portions, the pair of gusset portions and the flat bottom portion, and when the upper end is opened to form an opening. Facing the upper end of the inner peripheral portion of the opening, so as not to open between the inner surface of at least one flat portion of the front wall and the rear wall and the inner surface of each gusset portion on both sides, the flat portion and The bag body according to claim 1, wherein the folded pieces of each gusset part adjacent to the flat part are overlapped and fixed at a position below the upper end part.