JP4326911B2 - Packaging bag - Google Patents

Description

  The present invention relates to a packaging bag. More specifically, the present invention relates to a packaging bag suitable for storing an object to be packaged having a sharp portion such as a protrusion having a square shape on the surface or a protrusion such as a spine.

Frozen seafood, for example, is stored in a packaging bag in a frozen state in a food manufacturer or the like, vacuum packed, and then stored as a product, frozen, or distributed and sold in a frozen state. Yes.
Of frozen seafood and the like, an object to be packaged having a sharp portion such as an angular protrusion on the surface or a protrusion such as a spine (hereinafter referred to as a “package having an acute portion” unless otherwise specified). When the packaging bag is stored in a state and vacuum-packed, the packaging bag and the package are in close contact with each other, and irregularities corresponding to the surface shape of the package are formed on the packaging bag. In general, the packaging bags containing the objects to be packaged with the sharp parts in this manner are stacked in the storage and distribution process in the freezer, but the transport and packaging bags are stacked. Defects such as pinholes are likely to occur in the packaging bag due to sharp parts of the package due to impacts applied during the load, load from above due to stacking, vibration, rubbing, etc. during transportation, etc. As a result, the object to be packaged is frozen and burned, the quality is deteriorated, or the surface of the object to be packaged is frosted. Also, when thawing, liquid components such as moisture of the packaged goods flow out of the packaging bag through the pinhole, etc., and the packaging bag is soiled, and not only the outside air and humidity but also germs are pinholed. Etc., it may enter into the inside through the like, and proliferate, and hygiene problems arise.

If the bag material used for the packaging bag is made thick (for example, a polyamide / polyamide / polyethylene composite film and the thickness of polyethylene is considerably increased), pinholes can be prevented. This is not preferable because air drawing from the packaging bag deteriorates.
For this reason, a packaged object having a frozen sharp portion is wrapped with a film or the like, placed in a plastic bag, and then stored in a packaging bag sealed in two or three directions, and vacuum packaged. This is not preferable because it takes time and effort to wrap the article to be wrapped with a film or put it in a plastic bag. In addition, after thawing and opening, it is troublesome for consumers and the like to remove the film themselves or take out the items to be packaged from the plastic bags.

By the way, in order to prevent the pinhole of the packaging bag by the packaged object having the sharp end such as skewered food, grilled fish, Chinese medicine raw material, a double-structured packaging bag composed of an inner bag and an outer bag has been proposed. (For example, refer to Patent Document 1).
The packaging bag 61 described in Patent Document 1 includes an inner bag 62 made of a single film and an outer bag 63 made of a composite film, and a sealing edge 62a of the inner bag 62 is sealed by the outer bag 63. located at a distance L ₄ from the edge 63a, the opening side for filling the object to be packaged in packaging bag 61, the opening end edge 63b of the opening edge 62b of the inner bag 62 is the outer bag 63 A structure that protrudes outwardly (see FIG. 12), or the opening edge 62b of the inner bag 62 is the same as the opening edge 63b of the outer bag 63, and the inner surface of the outer bag and the inner bag along the opening edge. A structure (see FIG. 13) is adopted in which the outer surface of each is heat-sealed in a dot shape.

In the case of such a packaging bag, for example, when the item to be packaged is a skewered dumpling, the inner bag 62 is larger than the protruding length of the skewer from the sharp end of the skewer to the leading dumpling (the protruding skewer dimension). by setting the Futometan'en 62a and the distance L ₄ which separates the Futometan'en 63a of outer bag 63 increases, even if it penetrates the inner bag 62 is sharp tip portion of the skewer dumplings, outer bag 63 The sealing edge 63a does not reach the outer bag 63, and the outer bag 63 is not easily damaged. However, after the article to be packaged is stored in the packaging bag by a food manufacturer or the like, the four sheets constituting the packaging bag such as the inner surface of the outer bag, the outer surface of the inner bag, and the inner surfaces of the inner bag are integrated. The opening must be sealed by heat sealing with a heat seal bar or the like. If the sheet is thick, the seal temperature is increased or the seal time is increased to sufficiently transfer heat to the inner surface of the inner bag. However, these methods all increase the unit price of packaging bags.

Moreover, when opening the packaging bag described in Patent Document 1, four sheets must be opened at the same time, which is difficult to open. In particular, since the inner bag is composed of a single film, there is a drawback that the single film extends and is very difficult to open at the time of opening, and it cannot be said that the package is easy for the user. Moreover, in the packaging bag described in Patent Document 1, the opening edge 62b of the inner bag 62 protrudes outward from the opening edge 63b of the outer bag 63 on the opening side for filling the article to be packaged. Since the structure (see FIG. 12) or the opening edge 62b of the inner bag 62 is the same as the opening edge 63b of the outer bag 63 (see FIG. 13), a fish or the like having a sharp portion only at the tip In the case of packaged items, pinholes can be prevented by making only the sharp part of such a double structure, but the entire structure has a double structure and the entire inner bag covers the packaged object, so there is no need for pinhole resistant parts. The inner bag will be covered up to a certain part, and the sheet for the inner bag will be used more than necessary, which will increase the cost. In addition, as described above, in Patent Document 1, the inner bag is made of a single film, and the bag is made while being stretched by the tension during bag making, so that heat treatment such as boil and retort is performed. If done, the single film will return to its original shape due to heat, shrink and deteriorate in appearance. For this reason, it is not suitable for packaging bags that require heat treatment.
JP-A-7-257463 (first page, FIG. 2, FIG. 3)

  The present invention was devised as a result of earnest research in view of the above situation, and is a double bag composed of an inner bag and an outer bag, which can be easily and reliably sealed by heat sealing after storing the package. In particular, in the vacuum packaging after storing the packaged object, it is easy to open, and even when the packaged object having the sharp part is stored, pinholes are not easily generated by the sharp part. An object of the present invention is to provide a packaging bag that has good pulling, good adhesion with a packaged object, and less space with the packaged object.

In order to solve the above-described problems, the present invention provides (1) a lateral width formed of an outer bag having an inner surface having heat sealability, and a multilayer single-piece film or a composite film having inner and outer surfaces having heat sealability and different densities. Is a packaging bag having an inner bag having the same width as the outer bag and a vertical width shorter than the outer bag, the opening edge of the inner bag being set at a predetermined position below the opening edge of the outer bag In addition, the outer surface of the inner bag and the inner surface of the outer bag are heat-sealed over the entire width direction along the opening edge of the inner bag, and the inner bag is located at both sides where the inner bag is interposed. opposing inner surfaces, and the inner surface of the outer bag and the outer surface of the inner bag is heat sealed, in a portion where the inner bag is not interposed, inner surfaces of the outer bag is heat sealed, the vertical width of the inner bag The length according to the sharp part of the packaged object having the sharp part Is set to, pointed portion of the packaged articles is housed with the pointed portion in the inner bag, characterized in that the generation of pinholes in the packaging bag is adapted to be prevented and, ( 2) The outer bag is preferably made of a composite film. Further, (3) composite film in said bag, der Rukoto those heat sealing temperature is higher than the heat sealing temperature of the outer surface of the inner surface is preferred. (4) More preferably, the inner bag is a heat-resistant LLDPE / ONY / CPP composite film, and the outer bag is an ONY / heat-resistant LLDPE composite film.
( 5 ) The bottom of the inner bag may be a predetermined distance above the bottom of the outer bag.
( 6 ) In the bottom part of the packaging bag, the inner surfaces facing each other of the inner bag and the outer surface of the inner bag and the inner surface of the outer bag may be heat-sealed.

Since the present invention is configured as described above, the following effects can be obtained.
That is, according to the present invention, the opening edge of the inner bag is set at a predetermined position below the opening edge of the outer bag. What is necessary is just to heat-seal the inner surfaces of an outer bag with a heat-seal bar etc., and it can seal easily and reliably, and an outer bag should just be cut for opening, and opening property is also favorable.
By be paying the pointed portion of the packaged articles having an apex sharp portion inside the inner bag, the handling of the packaging bag, such as pinholes in the packaging bag by the pointed portion of the housing has been packaged articles is Hard to occur.
Moreover, since the length of the inner bag should just be the length according to the sharp part of the to-be-packaged object, the cost as a packaging bag will be reduced.

In addition, the total thickness of the inner bag and the outer bag can be made thinner than the thickness required for a single bag. Adhesion is good and there is little space with the package.
In order to manufacture special bags, it is usually necessary to remodel the bag making machine, which requires high remodeling costs, and the bag making machine that was stable due to remodeling often becomes unstable. However, since the packaging bag of the present invention has a simple structure, it can be manufactured by using a bag-making machine for manufacturing a general standing pouch almost as it is without any special modification, and it is inexpensive.

  The best mode for carrying out the invention will be described below, and the present invention will be described in more detail. Of course, the present invention is not limited to the following embodiments.

For the outer bag, it is preferable to use a film that can be formed into a bag by a seat heel, that is, a composite film having a thermoplastic synthetic resin layer whose inner surface has heat sealing properties, but has heat sealing properties. A single film made of a thermoplastic synthetic resin may be used.
Examples of the thermoplastic synthetic resin having heat sealability used for the innermost layer of the composite film or for a single film include low density polyethylene, linear low density ethylene-α-olefin copolymer (LLDPE), linear ultra-low Density polyethylene-α-olefin copolymer, ethylene-vinyl acetate copolymer, polypropylene, ionomer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl methacrylate copolymer, metathelon catalyst An ethylene polymer polymerized by the above can be used, but is not limited thereto. In the present invention, the term “simple” refers to a single layer produced by extruding one kind of thermoplastic synthetic resin, or a multilayer in which similar thermoplastic synthetic resins form a layer, for example, a film having a slightly different density in LLDPE. Is used to mean a film laminated with three layers.

As the intermediate layer and the outer layer in the composite film, various materials having a melting point higher than that of the thermoplastic synthetic resin used for the innermost layer can be used, and biaxially oriented polypropylene, propylene-based polymer, biaxially oriented polyamide, biaxial Examples include, but are not limited to, stretched polyester, nonwoven fabric, paper, cellophane, and aluminum foil. The thermoplastic synthetic resin used for the outer layer may be unstretched. In order to improve the gas barrier property of the composite film, for example, a gas barrier film deposited with silicon oxide, aluminum oxide or the like may be employed. An added film, a film coated with an ultraviolet ray inhibitor, or a film to which various additives are added according to the purpose can be used.
Aluminum foil is used to obtain gas barrier properties, light shielding properties, etc., but is generally used as an intermediate layer.
Biaxially stretched polyamide is preferably used for an intermediate layer or an outer layer of a composite film because pinholes hardly occur.
For the production of the composite film, an appropriate lamination method such as an adhesive lamination method, an extrusion lamination method, or a thermal lamination method may be used depending on the combination of materials to be combined. In the case of the adhesive lamination method, an appropriate adhesive is selected according to the combination of materials to be combined.

Further, when the packaging bag is used in a low temperature range such as freezing, the following composite film is suitable.
・ ONY / PE
ONY / ionomer Here, ONY represents a biaxially stretched polyamide, and PE represents a linear low density ethylene-α-olefin copolymer.
Three or more composite films may be used.

  The inner bag has inner and outer surfaces that are heat-sealable, and can be made into a bag by seat heel, and is heat-sealed with the inner surface of the outer bag that has heat-sealability and integrated with the outer bag. A single film of the same thermoplastic synthetic resin as exemplified as the innermost layer of the outer bag can be used. However, the present invention is not limited to this, and a composite film may be used.

  In general, the inner bag is not limited to a packaging bag used in a low temperature range such as freezing when a heat treatment such as boiling or retort is not necessary, but also in a packaging bag used in a normal temperature range, a single film An inner bag made of is preferable because pinholes are less likely to occur. As a single film used in a temperature range such as freezing, a linear low density ethylene-α-olefin copolymer single film is flexible even in a low temperature range such as freezing, and has a sharp portion. It is preferable because no pinhole or the like is generated. When heat treatment such as boil and retort is required, the single film is made with the film stretched by the tension during bag making, so the single film returns to its original shape due to heat and shrinks and the appearance deteriorates. Therefore, an inner bag made of a composite film is preferable. For the innermost layer and the outermost layer of this composite film, the same thermoplastic synthetic resin as exemplified as the innermost layer of the outer bag can be used. As the intermediate layer, the same thermoplastic synthetic resin as exemplified as the intermediate layer and the outer layer in the outer bag can be used. Examples of the composite film include heat resistant LLDPE / ONY / CPP. CPP is unstretched polypropylene.

Examples of the article to be packaged having a sharp portion in this invention include foods such as seafood, but are not limited thereto.
Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings. Of course, the present invention is not limited to the following embodiments.

FIG. 1 shows one embodiment of the packaging bag of the present invention, where (a) is a front view and (b) is a central longitudinal sectional view.
As shown in FIG. 1, the packaging bag 1 is provided with an inner bag 3 in an outer bag 2 having a width that is the same as that of the outer bag 2 and a width K that is shorter than that of the outer bag 2. is there. The outer bag 2 is composed of a pair of rectangular front sheets and rear sheets. The inner bag 3 is a rectangular sheet folded in half at the center. The outer bag 2 has a composite film. The film layer used as the inner surface of the outer bag is made of a thermoplastic synthetic resin having heat sealability, and a single film of the thermoplastic synthetic resin having heat sealability is used for the inner bag. In addition, although the composite film used for an outer bag is shown as two layers as shown in FIG. 2, it cannot be overemphasized that two or more layers may be sufficient.

The opening edge 3a of the inner bag 3 is located at an intermediate position in the longitudinal width of the outer bag 2 (a position L below the opening edge 2a of the outer bag 2), and extends along the opening edge 3a of the inner bag 3. Thus, the outer surface of the inner bag 3 and the inner surface of the outer bag 2 are heat-sealed over the entire width direction to form the fused portion 5a. The bottom portion 3 b of the inner bag 3 is above the distance H from the bottom portion 2 b of the outer bag 2. By being sealed three-way, the packaging bag 1 is located on the left and right side portions where the inner bag is interposed, the inner surfaces of the inner bag 3 facing each other, and the inner surface of the inner bag 3 and the inner surface of the outer bag 2. Are heat-sealed to form the fused portion 5b, and the inner surface of the outer bag 2 is heat-sealed to form the fused portion 5c where the inner bag is not interposed. And the inner surface of the outer bag 2 is heat-sealed in the bottom part of the packaging bag 1, and the melt | fusion part 5d is formed. Therefore, the outer bag 2 and the inner bag 3 are in a sealed state that does not communicate with the outside air, and the unsealed portion of the outer bag 2 is an opening for storing the items to be packaged in the packaging bag 1. It becomes part 6.
As is clear from FIG. 1, the storable length of the package in the packaging bag 1 is determined by the K, L, and the seal width required for sealing at the opening 6.

FIG. 3 shows an object to be packaged having a sharp portion in the packaging bag 1 (in the figure, a frozen fish having a sharp portion at the head, for example, an opening of barracuda), and vacuum packaging. Shows the state. The vertical width K of the inner bag 3 is set so as to exceed the range where the sharp portion of the packaged object exists.
In vacuum packaging, an article to be packaged is put through the opening 6 of the packaging bag 1, the sharp part of the article to be packed is placed in the inner bag 3, and then vacuum suction is applied from the opening 6 of the packaging bag 1. The opening 6 can be sealed by heat-sealing the inner surfaces along the opening edge of the outer bag 2 with a seal bar or the like. During vacuum packaging, the inner bag and the outer bag are in close contact with each other by the pulling in the vacuum packaging, and the outer bag is also deformed due to the tight deformation of the inner bag and the inner package. When the inner bag and the outer bag do not overlap with each other, the outer bag is in close contact with the object to be packaged, the suction by vacuum suction is good, the adhesion between the packaging bag 1 and the object to be packaged is good, and the packaging bag 1 There are few gaps between packages. Moreover, in the vicinity of the opening of the packaging bag 1, the inner surfaces of the outer bags 2 may be heat-sealed, and as in the packaging bag described in Patent Document 1, heat sealing is performed so that four sheets are integrated. Since there is no need to do this, it is possible to easily and surely seal without requiring skill by a food manufacturer or the like. Moreover, an outer bag should just be cut for opening, and opening property is favorable.
And the opening part of the inner bag is set to the intermediate part of the packaging bag, and has a length necessary to cover at least the sharp part of the packaged article. Thus, it is not necessary to cover even a portion that does not require an inner bag, and the cost as a packaging bag is reduced.

  Moreover, since the sharp part of the packaged object is vacuum-packed in a state in which it is housed in the inner bag 3 of the packaging bag 1, irregularities are formed in the packaging bag 1 by the sharp part of the packaged object. In the storage and distribution process in the freezer, the impact given when transporting and stacking the packaging bags 1 with the packaged items sealed, the load from above due to stacking, transporting and transporting in the stacked state, etc. Even if vibration, rubbing, etc. are applied to the outer bag 2, pinholes or the like hardly occur in the outer bag 2, the packaged item may be frozen and burned, the quality may deteriorate, or the surface of the packaged item may be frosted. Absent. Therefore, even when thawing, liquid components such as moisture of the packaged goods will flow out of the packaging bag, contaminating the packaging bag, and not only outside air and moisture but also germs will enter the inside of the packaging bag 1 In addition, there is no risk of proliferation and hygiene is good.

  This is because, in vacuum packaging, the packaging bag 1 is in close contact with the object to be packaged, and irregularities are formed on the packaging bag 1 by the sharp part of the object to be packaged, but the outer bag 2 and the object to be packaged are sharp. It is considered that the inner bag 3 intervenes between the two portions effectively functions to prevent the occurrence of pinholes and the like. The inner bag 3 and the outer bag 2 of the packaging bag 1 are blocked from the outside air and are not in communication with each other. After the vacuum packaging, the air remaining between the inner bag 3 and the outer bag 2 functions as a kind of air cushion. Especially when the inner bag is not damaged by the sharp part of the package, It is also conceivable that the influence of the sharp portion of the article to be packaged on the bag 2 is alleviated. As a material of the inner bag 3, it is preferable that a pinhole etc. is hard to generate | occur | produce, it is flexible, and it adapts to the sharp part of a to-be-packaged item, and deform | transforms well. For example, when LLDPE is used for an inner bag, the present inventors have confirmed that even if the film thickness is 120 μm, the inner bag is in close contact with the shape of the package by vacuum packaging. is doing.

  By the way, for example, when the frozen fish that is to be packaged has a sharp head, the inner bag 3 is caused by the sharp head due to inexperience or omission when stored in the packaging bag 1 or inadequate handling after vacuum packaging. Although it may be damaged and a part of the sharp head pierces the inner bag 3, the bottom 3b of the inner bag 3 and the bottom 2b of the outer bag 2 are separated by a distance H. If the protruding length of the sharp head that has been pierced is up to a distance H, the damage of the inner bag 3 does not reach the outer bag 2. The distance H between the bottom 3b of the inner bag 3 and the bottom 2b of the outer bag 2 may be set as appropriate according to the sharp head of the article to be packaged. In this way, when the inner bag 3 is damaged by the sharp head of the article to be packaged, and the sharp head pierces the inner bag 3, the material of the inner bag 3 may be difficult to propagate or expand. Even from this point, a linear low-density ethylene-α-olefin copolymer is desirable as the single film of the thermoplastic synthetic resin.

  In the case of a packaged item having a sharp head, the inner bag 3 is damaged by the sharp end of the packaged item due to inexperience and inadequate storage in the packaging bag 1, even if the sharp head is the inner bag. Since the outer bag 2 is not damaged even if it is stabbed 3, when vacuum suction is performed from the opening 6 during vacuum packaging, the air from the packaging bag 1 is excluded, and the packaging bag 1 There is little adhesion between the packaging bag 1 and the packaging bag 1 and the packaging material. Therefore, the storage state is good, and unnecessary wrinkles and the like are hardly generated near the opening 6 of the packaging bag 1, and sealing by heat sealing using a heat seal bar or the like is easy and reliable. The product value can be increased.

  Also, the sharp head pierces the inner bag 3 or the inner bag 3 is damaged by the sharp head when the packaged item is stored or when the packaging bag 1 after vacuum packaging is handled. As is apparent from the above, pinholes or the like are not easily generated in the outer bag 2, and the packaged item is frozen and burned, the quality is deteriorated, or the surface of the packaged item is frosted. There is nothing to do. Therefore, even when thawing, liquid components such as moisture of the packaged goods will flow out of the packaging bag, contaminating the packaging bag, and not only outside air and moisture but also germs will enter the inside of the packaging bag 1 However, there is no risk of multiplication and there is no problem with hygiene.

The packaging bag 1 can be manufactured, for example, according to the method shown in FIG. In order to manufacture special bags, it is usually necessary to modify the bag making machine, which requires high remodeling costs, and the bag making machine that was stable due to the modification often becomes unstable. Such a manufacturing method has an advantage that it can be performed by using a bag making machine for manufacturing a standing pouch almost as it is without any modification, and can reduce the manufacturing unit price of the packaging bag. .
In this manufacturing method, as shown in FIG. 4, the inner bag sheet 8 folded in the longitudinal direction is sandwiched between the long front sheet 7a and the rear sheet 7b for the outer bag, and heat sealing is performed. First, in the first heat seal part I, the outer surface of the inner bag sheet 8 and the inner surfaces of the outer bag front sheet 7a and the rear sheet 7b are long at the edge of the inner bag sheet 8. Heat-sealed in the direction, and then heat-sealed in the second heat-sealing part II in the direction perpendicular to these long sheets and in the longitudinal direction at the location corresponding to the bottom of the packaging bag, in cutting part III The packaging bags 1 are individually separated.

In the first heat seal part I, as is clear from FIGS. 4 and 5, a sheet 9 made of tetrafluoroethylene is interposed between the sheets 8 for the inner bag, and the heat seal is performed by the heat seal bar 10. Even if it goes, the inner surfaces of the inner bag sheet 8 are not fused to each other. The seal width of the inner bag and the outer bag by the heat seal bar 10 is preferably 3 to 5 mm.
In the second heat seal part II, among the portions that become the side portions of the packaging bag, at the locations where the inner bag sheet 8 is interposed, the opposing inner surfaces of the inner bag sheet 8, the inner bag sheet 8. The outer surface of the outer bag and the inner surfaces of the front sheet 7a and the rear sheet 7b for the outer bag are heat-sealed, and the inner surface of the front sheet 7a for the outer bag and the inner surface of the rear sheet 7b are heated at a place where the inner bag sheet 8 is not interposed. Sealed. Further, the inner surface of the front sheet 7a and the inner surface of the rear sheet 7b are heat-sealed at the lower end edges of the front sheet 7a and the rear sheet 7b for the outer bag.

Regardless of the manufacturing method as shown in FIG. 4, a packaging bag is individually manufactured using a rectangular sheet cut to the size of the inner bag, a front sheet and a rear sheet cut to the size of the outer bag. It may be. In this case, the widths of the inner bag and the outer bag are not necessarily the same, and they may be substantially the same as long as they fulfill the intended function as a packaging bag.
The packaging bag manufactured by the manufacturing method as shown in FIG. 4 has the same lateral width of the inner bag and the outer bag.

  In the case where a composite film is used for the inner bag, the innermost layer of the composite film and the outermost thermoplastic synthetic resin film have a heat seal temperature higher than that of the outermost layer. In heat seal part I, there is an advantage that it is not necessary to interpose a sheet 9 made of tetrafluoroethylene between the sheets 8 for the inner bag.

The packaging bag 11 shown in FIG. 6 is different from the packaging bag 1 shown in FIG. 1 in that the outer bag 12 is also formed by folding a rectangular sheet in half at the center.
To manufacture the packaging bag 11 shown in FIG. 6, instead of the long front sheet 7 a and the rear sheet 7 b for the outer bag in FIG. 4, a long sheet for the outer bag is provided along the longitudinal direction. Detailed description will be omitted because it is sufficient to use a folded product.

The packaging bag 21 shown in FIG. 7 is that the inner bag 23 is made of a pair of rectangular sheets, and the bottom edge is heat-sealed to form the fusion part 25. The packaging bag 1 shown in FIG. Is different.
In order to manufacture the packaging bag 21 shown in FIG. 7, instead of the inner bag sheet 8 folded in the longitudinal direction in FIG. 4, the bottom edges of the pair of long sheets for the inner bag were heat sealed. Detailed description will be omitted because it is only necessary to use a device.

The packaging bag 31 shown in FIG. 8 is different from the packaging bag 1 shown in FIG. As shown in FIG. 8, the packaging bag 31 is suitable for storing, for example, a bone-cut string.
As shown in FIG. 8, the vertical width of the inner bag may be appropriately changed according to the sharp part of the package.

The packaging bag 41 shown in FIG. 9 corresponds to the packaging bag shown in FIG. 8 that is shortened in the vertical direction and extended in the horizontal direction. This packaging bag 41 is suitable for heat treatment by boil retort. As shown in FIG. 9, the packaging bag 41 accommodates shrimp or a crab having a pointed portion at the end of the leg. In FIG. 9, the shrimp with skewers inserted from the tail side is shown as being stored. As is apparent from FIG. 9, the distance H from the bottom 42a of the outer bag 42 to the bottom 43a of the inner bag 43, the vertical width K of the inner bag, from the opening edge 42b of the outer bag 42 to the opening edge 43b of the inner bag By appropriately selecting the distance L and the lateral width of the packaging bag, there is also an advantage that an article to be packaged having a sharp portion can be stored at an arbitrary position of the packaging bag.
Since the packaging bag 41 containing the shrimp is vacuum-sucked, the opening is heat-sealed, sterilized at a high temperature, and then stored in the refrigerator. A composite film composed of two layers of / LLDPE and a composite film composed of three layers of LLDPE / ONY / CPP for the inner bag 43 are suitable because they need to be sterilized. A packaging bag made of such a composite film is also suitable for retort use. Of course, depending on the articles to be packaged, a composite film composed of three layers may not be used for the inner bag.

The packaging bag 51 shown in FIG. 10 is different from the packaging bag 1 shown in FIG. 1 in that the bottom of the outer bag 52 and the bottom of the inner bag 53 are heat-sealed at the same position.
Although this packaging bag 51 has a sharp portion on the body-side body portion, it is suitable for storing an article to be packaged that does not have a sharp head.

FIG. 11 shows an example of a manufacturing method of the packaging bag 51 shown in FIG. This is shown in FIG. 4 so that the lower end edges of the long front sheet 55a and the rear sheet 55b for the inner bag coincide with the lower end edges of the long front sheet 56a and the rear sheet 56b for the outer bag. Detailed description will be omitted because it may be performed in accordance with the manufacturing method of the packaging bag.
Moreover, it is clear from the above that the packaged object having the sharpened portion to be stored is not limited to frozen seafood.

  Next, an example is shown with a comparative example, and it explains in more detail.

(Example 1) A composite film of 15 μm thick ONY / polyester adhesive / 15 μm thick ONY / polyester adhesive / 70 μm thick LLDPE is used as a sheet for an outer bag, and a single film of 70 μmL LLDPE is used. As a sheet for the inner bag, the packaging bag shown in FIG. 1 was produced. The manufacturing method of the packaging bag was performed according to the manufacturing method of the packaging bag shown in FIG. The heat seal temperature was 180 ° C.
Here, ONY is a biaxially stretched polyamide, and LLDPE is a linear low density ethylene-α-olefin copolymer.
The packaging bag (outer bag) has a width of 140 mm and a vertical width of 440 mm, and the inner bag has a width of 140 mm and a vertical width (K) of 200 mm. The opening edge of the inner bag and the opening edge of the outer bag The distance L is 210 mm, and the distance H from the bottom of the outer bag to the bottom of the inner bag is 20 mm.

One open barracuda frozen as a packaged object having a sharp portion was stored in a packaging bag and vacuum-packed (see FIG. 3). The heat seal temperature of the opening of the packaging bag was 150 ° C. The seal width of the opening of the packaging bag is 10 mm. The pinhole resistance test was performed as follows.
[Test method]
The article to be packaged was stored, the bottom of the packaging bag with the heat-sealed opening was directed downward, dropped vertically from a height of 30 cm toward the dropping surface, and the number of pinholes was confirmed visually. The falling surface was a 3 mm thick rubber cutting mat placed on a wooden base, and a 0.3 mm thick paper towel was stacked on the cutting mat.
This packaging bag had good pinhole resistance.

  In addition, the packaging bag can be made thinner in the total thickness of the inner bag and the outer bag than the thickness required in the case of a single bag, and the pulling in the vacuum packaging after storing the package is good. Good adhesion to the packaged object, less space with the packaged object, and unnecessary wrinkles hardly occur near the opening of the packaging bag. Heat using a heat seal bar or the like Sealing with a seal could be performed easily and reliably. Moreover, when the notch was put in the heat seal location which only the sheet | seat for outer bags of the packaging bag was fuse | melted, and this notch was opened, it was able to open easily. Therefore, this packaging bag has sufficient commercial value.

(Example 2) ONY / polyester adhesive having a thickness of 15 μm / heat-resistant LLDPE composite film having a thickness of 60 μm was used as a sheet for an outer bag, and heat-resistant LLLDPE / polyester adhesive / polyester adhesive having a thickness of 15 μm / ONY / A packaging bag shown in FIG. 9 was manufactured using a CPP composite film having a thickness of 50 μm as a sheet for an inner bag. The manufacturing method of the packaging bag was performed according to the manufacturing method of the packaging bag shown in FIG. The heat seal temperature was 200 ° C.
Here, ONY is biaxially stretched polyamide, LLDPE is a linear low density ethylene-α-olefin copolymer, and CPP is unstretched polypropylene.
The size of the packaging bag (outer bag) is 215 mm in width and 180 mm in length, the size of the inner bag is 215 mm in width and 130 mm in length (K), and the distance L between the opening edge of the inner bag and the outer bag is 20 mm. The distance H from the bottom of the outer bag to the bottom of the inner bag is 25 mm.
The reason why the composite film is used for the inner bag in this packaging bag is that heat treatment is performed after packaging.

In a packaging bag, three headed skewered shrimps were stored in parallel and packaged in vacuum as a packaged item having a sharp portion and requiring heat treatment after packaging (see FIG. 9). The heat seal temperature at the opening of the packaging bag was 130 ° C. The seal width of the opening of the packaging bag is 10 mm. After heat sealing, heat treatment was performed at 110 ° C. for 20 minutes. And when the pinhole-proof test was done according to the test method mentioned above, this packaging bag was favorable in pinhole-proof property.
This packaging bag is brought into close contact with the article to be packaged at the place where the inner bag and the outer bag overlap by pulling in vacuum packaging, and the outer bag is also brought into close contact with the article to be packaged. Deformation, where the inner bag and the outer bag do not overlap, the outer bag is in close contact with the object to be packaged, the vacuum suction is good and the object is in close contact with the object to be packaged, creating a space with the object to be packaged In addition, unnecessary wrinkles and the like hardly occur even in the vicinity of the opening of the packaging bag, and sealing by heat sealing using a heat seal bar or the like could be easily and reliably performed. Moreover, when the notch was put in the heat seal location which only the sheet | seat for outer bags of the packaging bag was fuse | melted, and this notch was opened, it was able to open easily. Therefore, this packaging bag has sufficient commercial value.

Comparative Example 1 A three-sided bag heat-sealed on three sides was produced using a composite film of 15 μm thick ONY / polyester adhesive / 15 μm thick ONY / polyester adhesive / 70 μm thick LLDPE. The heat seal temperature was 180 ° C.
The ONY and LLDPE used here are of the same type as in the first embodiment.
The size of this packaging bag is 140 mm in width and 440 mm in length, and the heat seal width of the three-side seal is 10 mm.
One frozen barracuda was stored as a packaged object having a sharp portion in a packaging bag and vacuum-packed. The heat seal temperature at the opening of the packaging bag was 150 ° C. The seal width of the opening of the packaging bag is 10 mm.
When the pinhole resistance test of this packaging bag was performed according to the test method described above, the pinhole resistance was not good.

  In addition, although the size is different, a packaging bag having a shape similar to that of Example 2 is manufactured, and the crab scissors are stored in the packaging bag so that the tip of the scissors faces the bottom of the inner bag. After heat sealing, the pinhole resistance was tested according to the pinhole resistance test method described above. As a result, this packaging bag also showed good pinhole resistance.

The one aspect | mode of the packaging bag of this invention is shown, (a) is a front view, (b) is a center longitudinal cross-sectional view. It is an expanded sectional view near the fusion part of an inner bag and an outer bag. It is explanatory drawing which shows the state which accommodated the to-be-packaged article in the packaging bag shown in FIG. 1, and was vacuum-packed. It is explanatory drawing which shows an example of the manufacturing method of the packaging bag shown in FIG. It is AA sectional view taken on the line in the manufacturing method of the packaging bag shown in FIG. It is a front view which shows the other aspect of the packaging bag of this invention. It is a front view which shows the other aspect of the packaging bag of this invention. It is a front view which shows the further another aspect of the packaging bag of this invention, Comprising: It is explanatory drawing which shows the state which accommodated the to-be packaged object and was vacuum-packed. It is a front view which shows the further another aspect of the packaging bag of this invention, Comprising: It is explanatory drawing which shows the state which accommodated the to-be packaged object and was vacuum-packed. The further another aspect of the packaging bag of this invention is shown, (a) is a front view, (b) is a center longitudinal cross-sectional view. It is explanatory drawing which shows an example of the manufacturing method of the packaging bag shown in FIG. It is a front view which shows an example of the conventional packaging bag. It is a perspective view which shows the other example of the conventional packaging bag.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Packaging bag 2 Outer bag 3 Inner bag 5a, 5b, 5c, 5d Fusion part

Claims (6)

In the outer bag having an inner surface having heat sealability, the inner and outer surfaces are heat-sealable and the width of the multi-layer single film or composite film having different densities is the same as that of the outer bag and the vertical width is greater than that of the outer bag. A packaging bag with a short inner bag,
The opening edge of the inner bag is set at a predetermined position below the opening edge of the outer bag, and the outer surface of the inner bag and the outer bag of the outer bag are spread over the entire width direction along the opening edge of the inner bag. The inner surface is heat sealed,
On both sides, the inner bag is located at the location where the inner bag is opposed, and the inner surfaces facing each other, and the outer surface of the inner bag and the inner surface of the outer bag are heat-sealed. The inner surfaces of each are heat sealed ,
The length of the inner bag is set to a length corresponding to the sharp part of the packaged object having the sharp part, the sharp part of the packaged object having the sharp part is accommodated in the inner bag, and the packaging bag A packaging bag characterized in that the occurrence of pinholes in the bag is prevented . The packaging bag according to claim 1, wherein the outer bag is made of a composite film. The packaging bag according to claim 1 or 2, wherein the composite film of the inner bag has an inner surface heat seal temperature higher than an outer surface heat seal temperature . The inner bag is heat resistant LLDPE / ONY / CPP composite film, according to claim 3 packaging bag according to the outer bag and said ONY / heat-resistant LLDPE composite film der Rukoto. The packaging bag according to claim 1, 2 , 3, or 4 , wherein the bottom portion of the inner bag is located a predetermined distance above the bottom portion of the outer bag. At the bottom of the packaging bag, the inner surface facing each other of the inner bag, and the outer surface and the inner surface of the outer bag in said bag, according to claim 1, characterized by comprising heat sealed, 3 or 4. The packaging bag according to 4 .

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