JP2010275018A - Double self-supporting bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bag which is a double bag for protecting a weak product against shocks and has a self-supporting property. <P>SOLUTION: A double folded member is inserted into a self-supporting bag having a bottom gusset section at a bottom section by turning down a folded section above the folded section of the bottom gusset, and a side of the member is sealed by overlapping front and back films of the self-supporting bag. Each of both upper ends of the double folded member is sealed with each of front and back films at its upper part, and a space surrounded by the front and back films and the double folded member is prepared at the upper part. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a self-supporting double self-supporting bag capable of buffering an external impact on a packaged product.

  Conventionally, for pharmaceuticals, for example, eye drops or PTP-packed tablets in glass containers, for foods, for example, chocolate containing western liquor, for precision instruments, for example, ink cartridges for printers or glass solar cells As a packing body for storing contents that need to be protected from external impact or heat, such as panels, the so-called back-in box and packing bag have a double structure, and the outer layer is sealed with air to provide cushioning There is a packing bag that protects the packaged goods by holding the bag.

As a packaging bag for such a purpose, for example, it has a double structure of an inner bag that seals an object to be packed and an outer bag that seals the inner bag through a certain space. A double-structure sealed packing bag that is integrated at more than one place has been proposed (Patent Document 2).
However, the conventional packaging bag like Patent Document 2 has a problem that once the package is opened and the packaged item can be taken out, the outer layer portion is also torn and the gas escapes and cannot be reused as a cushioning packaging bag. was there.

  At present, there is a normal flat pouch or a gusset pouch for a double bag for protecting an impact-sensitive product from external force, but there is no self-supporting one. Therefore, in order to make it easier to see the front of the product for sale, a troublesome method such as attaching a hook hole and hanging it on a hanger is necessary.

  Conventionally, a standing pouch that is self-supporting is, for example, a bottom gusset type bag-like container (Patent Documents 1 and 3) formed by heat-sealing a body member and a bottom member formed of a laminated film. In order to protect the contents from external forces with this structure, the only way to create a large space inside the pouch was to inflate with a large amount of air inside. In this way, the product inside is protected from external forces, but because the space inside the pouch has expanded, it can be played in the bag, and the product can be broken or sprinkled by the play.

  Also, if the bottom tape is inserted inside the inner bag like a conventional standing pouch in the double bag state, the inner bag is pushed inward by the air pressure outside the inner bag, and the bottom tape does not open. The independence of the pouch is at risk.

As a method for improving the self-supporting property of the standing pouch, the non-fused portion 3 having a closed contour extending in the vertical direction is formed between the laminated films constituting the front and back surfaces at the side edge portion 2 of the self-standing bag 1 There has been proposed a method for improving the self-supporting and shape-retaining properties of a bottom gusseted self-supporting bag by using an air bag that is blown and sealed with pressurized air (Patent Document 4).
This is also a self-supporting auxiliary means, and it is unavoidable to have a complicated configuration requiring a large area not directly used as a container by providing the airbag portion perpendicularly to the side of the bag.

  As described above, it has been difficult in the past to provide a double bag for protecting a product that is vulnerable to impacts and having a self-supporting bag.

JP-A-8-119294 JP-A-9-240730 Japanese Patent Laid-Open No. 2004-256126 JP 2006-123931 A

  It is an object of the present invention to provide a double self-supporting bag that is a double bag for protecting a product that is vulnerable to impact and has self-supporting properties.

  In the invention according to claim 1 of the present invention, a member folded in two is inserted with the folded portion facing downward above the folded portion of the bottom gusset of the self-standing bag having a bottom gusset portion at the bottom, and the side portion of the member is self-supporting. Double-sided and sealed with the front and back films of the bag body, and the upper part has a space surrounded by the front and back films and the folded parts. It is a free-standing bag.

  In the invention according to claim 2 of the present invention, the front and back films are not sealed inward of the bag from the four-ply seal part of the side part overlapped with the front and back films of the main body of the self-supporting bag, and are folded in two. The double self-supporting bag according to claim 1, wherein a content support seal portion to which only the members are attached is provided.

  In the invention according to claim 3 of the present invention, a blowing port for blowing gas into a space surrounded by the front and back films and the folded member is provided on at least one of the front and back films of the main body of the self-supporting bag. The double self-supporting bag according to claim 1, wherein the double self-supporting bag is provided.

  In the invention according to claim 4 of the present invention, the front and back films of the self-supporting bag are films having low gas permeability, the folded member is a film having high gas permeability, and is surrounded only by the folded member. The double self-supporting method according to any one of claims 1 to 3, wherein the space is filled with contents, and the space surrounded by the front and back films and the folded member is filled with an inert gas. A method for preventing oxidation of contents, characterized by using a bag.

According to the invention according to claim 1 of the present invention, the folded member is inserted downward with the folded portion facing downward from the folded portion of the bottom gusset of the self-standing bag having the bottom gusset portion at the bottom, and the side portion of the member is Because the upper part of the body of the self-supporting bag is overlapped and sealed with the front and back films, and the upper part has a space surrounded by the front and back films and the folded parts. Thus, a shock-absorbing effect against impact is obtained, and the protection of the contents is improved.
In addition, the folded part is inserted with the folded part facing downward above the folded part of the bottom gusset of the self-standing bag having a bottom gusset at the bottom, and the side of the member overlaps the front and back films of the body of the free-standing bag In order to seal and fix, the bottom gusset can be easily inflated to the extent that self-sustainability can be ensured without being restricted by a member inside the bag when the space is filled with gas.

  As a result, it is possible to provide a double bag for protecting products that are vulnerable to shocks and a self-supporting bag, and a double bag with cushioning and heat insulation to protect the contents from shock and heat. The bag was self-supporting, so it could be a double self-supporting bag that requires less storage and exhibition space.

According to the invention according to claim 2 of the present invention, the front and back films are not sealed inward of the bag from the four-ply seal part of the side part overlapped with the front and back films of the main body of the self-standing bag. By providing a content support seal with only folded members attached, it has a buffering effect against impact from the outside in a space created by gas filling, and it is effective for backlash of contents and damage due to collision It was possible to make a double self-supporting bag that can be prevented.

  According to the invention of claim 3 of the present invention, at least one of the front and back films of the main body of the self-supporting bag is provided with a blowing port for blowing gas into a space surrounded by the front and back films and the folded member. As a result, gas can be easily blown into the space when the contents are filled.

  According to the invention according to claim 4 of the present invention, the front and back films of the self-supporting bag are films with low gas permeability, the folded member is a film with high gas permeability, and is surrounded only by the folded members. Filling the inner space with the contents, and filling the space surrounded by the front and back film and the folded member with an inert gas such as nitrogen, the front and back film and the folded member The inert gas filled in the space surrounded by the permeate passes through the folded member and moves to the inner bag to prevent the contents enclosed in the inner bag from being oxidized.

  For this purpose, the film constituting the inner bag is preferably a single layer structure of a polyethylene film or a polypropylene film having a large nitrogen permeability. In addition, as long as the films are bonded, a three-layer structure of polyethylene / stretched polypropylene / polyethylene or a three-layer structure of polypropylene / stretched polypropylene / polypropylene is desirable. If the content is a substance that gradually oxidizes, it is possible to use a film having a smaller inert gas permeability.

  As the front and back films constituting the outer bag, a film having low gas permeability is suitable for preventing the escape of the inert gas to the outside and the permeation of oxygen gas from the outside. As an example of such a film, a film in which an aluminum foil, aluminum, aluminum oxide, or silicon oxide is deposited is given.

In addition, since the contents are enclosed in a bag inside the double bag, a large amount of volume necessary for the expression of cushioning is not required, and rattling is less likely to occur inside compared to a single bag. The amount of nitrogen gas used can be reduced compared with the case where nitrogen is replaced with a single bag. The method of enclosing the deoxidized material is safer than food because there is still a risk of accidental eating.
Since the inert gas is sealed in the space surrounded by the front and back films and the folded member, there is an effect that excess gas in the inner bag is pushed out by the pressure at the time of sealing. It should be noted that a gasizable liquid or solid such as liquid nitrogen may be used instead of the inert gas, but it is necessary to limit the filling amount in consideration of the volume when vaporized.
As described above, according to the method of claim 4, the effect of preventing the oxidation of contents such as easily oxidizable food and easily oxidized metal such as iron can be expressed using the double self-supporting bag. .

It is the cross-sectional schematic diagram in the X-X 'line | wire which shows one Embodiment of the double self-supporting bag of this invention (left side) front schematic diagram (right side). It is the cross-sectional schematic diagram in the X-X 'line | wire which shows one Embodiment of the conventional double bag (left side) front schematic diagram (right side). It is the cross-sectional schematic diagram in the Z-Z 'line | wire (the upper side) front schematic diagram (lower side) which shows one Embodiment of the double self-supporting bag of this invention. It is the cross-sectional schematic diagram in the Z-Z 'line | wire (the upper side) front schematic diagram (lower side) which shows one Embodiment of the double self-supporting bag of this invention.

  Hereinafter, an embodiment of the double self-supporting bag of the present invention will be described with reference to FIGS. 1 to 4. The double self-supporting bag described here inserts the contents into the inside thereof, and cushions the external impact on the contents and has self-supporting properties.

  FIG. 1 shows a state in which the contents A are inserted into the double self-supporting bag of the present invention and filled with a buffer gas, and the left side view is a schematic view seen from the front, and the right side view is The cross-sectional schematic diagram in the XX 'line | wire of a front schematic is shown.

FIG. 3 and FIG. 4 show an example of an embodiment corresponding to claim 2 of the present invention, so that the contents are not fixed inside the bag so that it does not roll or hit and get damaged. The example in the case of providing a seal part in the inner bag is represented by a schematic view seen from the upper front and a schematic sectional view taken along the line ZZ ′ of the lower front schematic.
FIG. 2 is a diagram for expressing a part of a problem when a bottom gusset is simply formed with the intention of giving a conventional double bag self-supporting, and a schematic diagram viewed from the front is shown on the left side. The diagram on the right side shows a schematic cross-sectional view taken along line XX ′ of the schematic front view. Here, FIG. 2 will be referred to as necessary for comparison with the conventional method for providing the double bag with self-supporting properties.

  As shown in FIG. 1, the double self-supporting bag of the present invention is a self-supporting bag provided with a bottom gusset portion by a bottom tape (3) and a bottom seal portion (6) of a front and back film (1) forming an outer bag at the bottom. The folded part of the bottom gusset, that is, the upper end edge folded part (10) of the bottom tape (3), the folded member forming the inner bag, that is, the inner bag film (2) is inserted downward with the folded part facing downward. The side part of the self-standing bag is sealed with the front and back films of the body of the self-supporting bag and the upper side seal part (5), and the upper part is sealed with the upper and lower films and the top seal part (4), respectively. The double self-standing bag having a gas-filled space (7) surrounded by a front and back film and a folded member, that is, an inner bag film (2).

As the inner bag film (2), sealant materials such as a low density polyethylene film (LDPE), a linear low density polyethylene film (LLDPE), and an unstretched polypropylene film (CPP) that can be thermally welded with a thermoplastic resin are used. Used.
As the inner bag film (2), for example, Ny, PET, OPP, Al foil, or a deposited film obtained by depositing an inorganic substance such as metal aluminum, alumina, or silica on Ny, PET, or OPP, etc. It is also possible to use a single-layer or multilayer substrate film provided with a sealant material such as LDPE, LLDPE, or CPP as a thermoplastic resin capable of heat welding on both surfaces of the substrate. Thereby, it becomes possible to adjust the barrier property and strength of the inner bag film.

For the front and back film (1) forming the outer bag, nylon film (Ny), polyethylene terephthalate film (PET), biaxially stretched polypropylene film (OPP), aluminum foil (Al foil), or Ny, PET, OPP LDPE, LLDPE, CPP that can be heat-welded with a thermoplastic resin to a single-layer or multi-layer substrate film made of a vapor-deposited film on which an inorganic material such as metal aluminum (Al), alumina, or silica is deposited A material provided with a sealant material such as is used.
The front film and the back film of the front and back films (1) are both formed into a substantially rectangular shape. The film (2) is joined in close contact with the belt in the form of a sandwich.

The inner bag film (2) and the front and back films (1) are the lower end of the inner bag of the side seal portion (5) provided slightly above the folded upper end edge (10) of the bottom tape (3) of the bottom gusset portion. Edge (9
) From the top to the top and are joined in a band shape.
In the top seal part (4) of the bag, the inner bag film (2) and the front and back films (1) are stuck together in a band shape after the contents (A) are inserted into the inner bag film (2). It is joined.

  The front and back films (1) are provided with a cross-shaped gas blowing port (8), and the contents (A) are enclosed by the inner bag film (2) before sealing the top seal portion (4). After inserting the inside and sealing the top seal part, air is introduced into the gas filling space (7) surrounded by the front and back film (1), the bottom tape (3) and the inner bag film (2) using a nozzle or the like After filling with a buffering gas such as, it is sealed.

  The shape of the gas blowing port (8) is not limited to the cross-shaped cut, and an appropriate shape can be selected according to the shape and operation of the blowing nozzle. The position where the gas blowing port is provided may be any position other than the seal part of the front and back film (1), and any number may be provided. However, providing an unnecessarily large number not only complicates the manufacturing process but also seals off. This is not a good idea.

  Thus, according to the present invention, it is possible to provide a double bag for protecting a product vulnerable to impact and a self-supporting bag, and cushioning for protecting contents from impact and heat. In addition, a double self-supporting bag that is self-supporting can be obtained.

  Here, a part of the problem in the case where the bottom gusset is simply formed on the double bag for the purpose of giving the self-supporting property to the conventional double bag will be described with reference to FIG.

  As shown in FIG. 2, when a bottom gusset is provided like a conventional standing pouch in the state of a normal double bag, the front and back films (1) forming the outer bag and the inner bag film (2) forming the inner bag are obtained. Since the bottom tape (3) enters the inside of the inner bag film (2) in an overlapped state, the gas filling space outside the inner bag surrounded by the inner bag film (2) and the front and back films (1) The inner bag is pushed inward by the pressure of the air filled in (7), and the bottom tape (3) of the bottom seal part (6) does not open sufficiently, so the bottom area of the bag does not widen and the double bag Independence is at risk.

  On the other hand, the double self-supporting bag of the present invention is composed of an outer bag by separating the inner bag and the bottom gusset portion of the double bag in order to achieve both the content protection and self-supporting properties of the double bag. Protect the contents as a double bag by providing a content storage part as an inner bag inside a self-supporting bag with a bottom gusset, and filling the space between the inner bag and the outer bag with a gas such as air Is ensured.

  Further, the double self-supporting bag of the present invention has a front and back film (1) on the inner side (11) of the bag from the four-layer seal part (5) on the side part overlapped with the front and back film (1) of the main body of the self-supporting bag. ) Is not sealed, and only the inner bag film (2), which is a member folded in two, is attached to the outside by providing a content support seal portion (11) as shown in FIG. It is possible to effectively prevent the contents from being rattled in the space inside the inner bag or being damaged due to the collision while having a buffering effect against the shock from the inside.

  3 is not limited to the shape as shown in FIG. 3, for example, as shown in FIG. 4, that is, only the inner bag film (2) is bonded to the side seal portion (5). The region of the content support seal part (11) is provided so as to surround the content (A), and the inner bag part where the two inner bags are stacked is anchored to the side seal part and the content is kept inside. It can also be made into a shape that reduces vibrations inside the bag.

  It is preferable that the content support seal portion between the inner bags provided in the double self-supporting bag of the present invention has an appropriate shape corresponding to the shape of the content.

Next, the usage method of the double self-supporting bag of this invention is demonstrated.
Using the bag having the side seal and the bottom seal, the contents (A) are inserted into the inner bag from the top seal portion (4) shown in FIG.

  Next, both upper end edges of the front and back films (1) and the inner bag film (2) are overlapped by the top seal part (4) and heat sealed to be sealed. At this time, since no gas is fed into the gas filling space (7), the contents (A) inside the inner bag are in a state of being freely movable.

  In this state, a gas inlet nozzle (not shown) is connected to the inner bag film (2) and the outer bag front and back films (1) from the gas blowing port (8) provided in the front and back films (1) shown in FIG. It inserts in the gas filling space (7) between and injects gas.

  When an appropriate amount of gas is fed into the gas filling space, the nozzle is pulled out while holding the gas blowing port (8) so that the gas does not leak from the gas filling space (7), and the gas blowing port is welded by thermal fusion. And seal.

  In addition, before the upper and lower edges of the front and back films (1) and the inner bag film (2) are overlapped by the top seal part (4) and thermally sealed and sealed, the gas blowing provided on the front and back films (1) is blown If gas is sent in from the opening | mouth (8), an inner bag film (2) will be pushed from the outer side, and will be in a deaeration state more.

  In this manner, the upper end edges of the front and back films (1) and the inner bag film (2) are reduced in a state where the play space in the inner bag film (2) is reduced and the backlash of the contents (A) is reduced. A method of heat sealing and sealing is also conceivable.

The gas fed into the gas-filled space may be air as long as it provides cushioning properties for buffering purposes, but an inert gas such as nitrogen can also be used from the viewpoint of barrier properties.
In addition, as an application example of the present invention, it is possible to obtain a desired effect using various gases. For example, it is said that a mixed gas of nitrogen and carbon dioxide is effective for preserving cheese, and the cheese is preserved by enclosing the mixed gas of nitrogen and carbon dioxide in the outer space of the double bag of the present invention. Can provide a packaging material suitable for.
In addition, by using water as the storage contents and gas enclosed in the outer space of the double bag as oxygen or hydrogen gas, these gases are dissolved in water to form a package of oxygen water or hydrogen water. Is also possible.

  As shown in the schematic cross-sectional view on the right side of FIG. 1, the double self-supporting bag has the contents (A) surrounded by the gas-filled space (7), and the space in the inner space of the inner bag film (2) is greatly reduced. It becomes difficult to move and is protected by the gas filling space (7) filled with gas.

  The effect is that the front and back films (1) are sealed to the inner side (11) of the bag from the four-ply seal part (5) on the side part overlapped with the front and back films (1) of the main body of the self-supporting bag. It is more improved by providing a content support seal portion (11) as shown in FIG. 3 and FIG. While having a buffering effect against an impact from the outside, it is possible to more effectively prevent the contents from being loose in the space inside the inner bag or being damaged due to a collision.

  As described above, a double self-supporting bag having a cushioning property and a heat insulating property for protecting contents from impact and heat and having self-supporting properties can be obtained.

DESCRIPTION OF SYMBOLS 1 ... Front and back film 2 ... Inner bag film 3 ... Bottom tape 4 ... Top seal part 5 ... Side seal part 6 ... Bottom seal part 7 ... Gas filling space 8 ... Gas blowing inlet 9 ... Inner bag lower end edge 10 ... Bottom tape upper end edge 11 ... Contents support seal part A ... Contents

Claims (4)

  A self-standing bag with a bottom gusset at the bottom is inserted above the folded part of the bottom gusset, the folded part is inserted with the fold facing downward, and the side of the member overlaps with the front and back films of the body of the free-standing bag The upper part is a double free-standing bag having a space part that is sealed with the front and back films and the front and back films and the folded members in the upper and lower ends.   Supports the contents that are not sealed with the front and back films inside the bag from the four-ply seals on the sides of the self-supporting bag that overlaps the front and back films. The double self-supporting bag according to claim 1, wherein a seal portion is provided.   3. A blowing port for blowing gas into a space surrounded by the front and back films and the folded member is provided in at least one of the front and back films of the main body of the self-standing bag. Double self-supporting bag as described in.   The front and back film of the self-supporting bag is a film with low gas permeability, the folded member is a film with high gas permeability, and the contents enclosed in the space surrounded only by the folded member are filled with the front and back films. And a double self-supporting bag according to any one of claims 1 to 3 in a packaging method for filling an inert gas into a space surrounded by a member folded in half. How to prevent oxidation.

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