JP2001163352A - Packaging material and vacuum packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging material and a vacuum packaging bag which can be made up simply and inexpensively because an outer bag and an inner bag thereof can be stcuk together partly by employing a widely-used processing machine. SOLUTION: The packaging material is such that is made up by sticking an outer bag film and an inner bag film having a heatsealable resin layer at its inside partly together at sticking parts provided at peripheral areas thereof. While sticking layers are formed at the inside of the outer bag film on positions corresponding to the sticking parts, mold releasing layers are formed at areas excluding the sticking parts, and the inside of the outer bag film and the outside of the inner bag film are laminated together with the heat-sealable resin layer, and thereby the packaging material made up by sticking the outer bag film and the inner bag film partly together at the areas where the sticking layers are formed and the vacuum packaging bags made up of the said packaging material can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum packaging bag which comprises an outer bag and an inner bag and can form a smooth outer bag surface in a vacuum packed state.

[0002]

2. Description of the Related Art Conventionally, as for a packaging bag capable of obtaining a smooth surface in a vacuum-packaged state, for example, US Pat.
No. 5037, an outer bag made of a polyester film or the like, and a gas barrier inner bag made of a laminate of a thermoadhesive resin such as polypropylene, aluminum foil and polyethylene, etc. A packaging bag is known which is partially bonded and integrated. However, in the case of the vacuum packaging bag having the above configuration, in a printing process of printing a pattern on a polyester film or the like constituting the outer bag, a register is applied to the pattern, and an adhesive is partially applied. In the method of laminating by laminating the laminated film constituting the inner bag partially in-line, or in the printing process of printing the pattern on the polyester film constituting the outer bag, etc. It is manufactured by a method of applying an adhesive and partially bonding by lamination with the laminated film constituting the inner bag in a separate process,
The former method requires a machine that performs dry lamination in-line with printing, while the latter method requires a heat laminator to perform heat lamination in a separate process, and it is difficult to perform the heat lamination process at high speed. However, there is a disadvantage that the workability is poor and the cost is increased.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a packaging material which can be manufactured easily and can be reduced in cost because the outer bag and the inner bag can be partially bonded by using a general-purpose processing machine. It is to provide a vacuum packaging bag.

[0004]

A packaging material comprising an outer bag film and an inner bag film having a heat-adhesive resin layer on the inner surface, which is partially bonded at a bonding portion in a peripheral region, wherein the inner bag film has an inner surface. An adhesive layer is formed in an area corresponding to the adhesive part of the mold, and a release layer is formed in an area excluding the adhesive part,
By laminating the inner surface of the outer bag film and the outer surface of the inner bag film via the adhesive resin layer, the outer bag film and the inner bag film are partially adhered in the region where the adhesive layer is formed, and the release layer By using a packaging material having a configuration that is not adhered in the area where is formed, the packaging bag made by using this packaging material has an outer bag film and an inner bag film at the thermal bonding portion at the edge. Due to the partially adhered structure, when the packaging bag is filled with granular or powdered content such as coffee and vacuum packaged, irregularities occur due to the granular content in the inner bag film, Since the inner bag film and the outer bag film are not bonded to each other in the area other than the heat-bonded portion at the edge of the packaging bag, the outer bag film has a smooth surface without any unevenness, so that a vacuum with excellent appearance can be obtained. Can be packaging bag Further, only by laminating the inner surface of the outer bag film on which the partial adhesive layer and the release layer are formed and the outer surface of the inner bag film via the adhesive resin layer, the outer bag film and the inner bag are formed in a region corresponding to the adhesive layer. Since the bag film can be partially adhered, the manufacturing process of the packaging material can be simplified and the manufacturing can be efficiently performed, so that the cost can be reduced.

[0005] In the above packaging material, the release layer is formed on the inner surface of the outer bag film so as to correspond to a portion to be folded when the packaging material is made into a packaging bag. Due to this, the outer bag film and the inner bag film are weakly adhered to each other when they are laminated with the adhesive resin layer. The inner bag film and the inner bag film can be easily separated from each other so that the outer bag film and the inner bag film do not adhere to each other.

In the above packaging material, the adhesive resin layer is made of low-density polyethylene having a density of 0.920 to 0.925, so that the density of the release layer formed on the inner surface of the outer bag film is reduced to 0. The adhesive layer made of low-density polyethylene of .920 to 0.925 is in a weakly adhered state immediately after lamination, but a release layer on the inner surface of the outer bag film is formed in a post-process such as slitting or bag making. Packaging material in which the outer bag film and the inner bag film can be easily separated from each other in the region where the adhesive layer is formed on the inner surface of the outer bag film. It can be.

[0007] An outer bag film and an inner bag film are partially adhered at the edge of the packaging bag obtained by making the packaging material into a bag. By forming a vacuum packaging bag that is degassed and packed, even if the inner bag film has irregularities when the packaging bag is filled with contents such as regular coffee powder and vacuum packed, the outer bag can be used. Since the film and the inner bag film are not bonded, the surface of the outer bag film can be kept in a smooth state, and a package having excellent design properties can be obtained.

In the above vacuum packaging bag, the outer bag film is made of biaxially stretched polyethylene terephthalate, the inner bag film is made of a laminate of biaxially stretched nylon, aluminum foil and a heat-adhesive resin layer. The gusseted pillow type configuration ensures that when this packaging bag is filled with regular coffee powder, etc. and vacuum-packed, the inner bag has excellent pinhole resistance and the outer bag has excellent strength and gloss, so it is stored. A rectangular parallelepiped package excellent in properties and design can be obtained. In addition, by using the gusset pillow type, a package having a rectangular parallelepiped outer shape can be accommodated with a large amount of contents.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing a packaging material according to a first embodiment of the present invention, and FIG. 2 is an enlarged view of I- in FIG.
I sectional view, FIG. 3 is a perspective view showing a vacuum packaging bag made of the packaging material of the present invention, FIG. 4 is a II sectional view in FIG. 3, and FIG. 5 shows the packaging material of the second embodiment of the present invention. 1 is an outer bag film, 11 is an adhesive layer, 12 is a release layer, 2 is an inner bag film, 3 is an adhesive resin layer, 4 is an adhesive portion,
Reference numeral 5 denotes a non-adhesive portion, 6 denotes a joint thermal bonding portion, 7 denotes an upper edge thermal bonding portion, and 8 denotes a lower edge thermal bonding portion.

A packaging material according to a first embodiment of the present invention is shown in FIG.
As shown in FIG. 2, it is a packaging material for producing a pillow-type gusset bag. The inner bag film 2 having the same rectangular shape as the outer bag film 1 having the rectangular shape is bonded by the bonding portion 4 partially provided on the peripheral edge portion, and the area other than the bonding portion 4 is formed as the non-bonding portion 5 to form the outer bag. Bag film 1
And the inner bag film 2 are integrated.

As shown in FIG. 2, the cross-sectional structure is such that an adhesive layer 11 is formed in a region corresponding to the bonding portion 4 on the inner surface of the outer bag film 1 and a region corresponding to the non-bonding portion 5 is formed. A release layer 12 is formed, and a surface of the outer bag film 1 on which the adhesive layer 11 and the release layer 12 are formed and an outer surface of the inner bag film 2 are laminated by an adhesive resin layer 3. The film 1 and the inner bag film 2 are bonded together at the bonding portion 4 via the bonding resin layer 3 to be integrated. In the region of the inner surface of the outer bag film 1 where the release layer 12 is formed, the surface of the release layer 12 and the adhesive resin layer 3 are not adhered to each other, and the non-adhered portion 5 is formed. The picture layer is formed between the outer bag film 1 and the adhesive layer 11 or the release layer 12.

A plan view of the packaging material according to the second embodiment of the present invention is as shown in FIG. 5, in which the position of the bonding portion 4 partially provided on the peripheral portion is different from that of the first embodiment. Except for the difference, the configuration is basically the same as that of the first embodiment. Second
In the embodiment, a non-adhesive portion 5 is formed at the upper and lower peripheral edges of the wrapping material at the vertical fold when a pillow type gusset bag is manufactured. In this case, when the surface on which the adhesive layer 11 and the release layer 12 on the inner surface of the outer bag film 1 are formed and the outer surface of the inner bag film 2 are laminated by the adhesive resin layer 3, the release layer 12 and the adhesive resin layer Although the gap between the three pieces is weakly adhered, a part that becomes a longitudinal fold is handled when making a pillow type gusset bag, and the outer bag film 1 and the inner bag film 2 are reliably peeled off. Is what you can do. In the first and second embodiments, a packaging material for producing a pillow-type gusset bag has been described, but the shape of the packaging bag to be produced is a pillow-type bag, a three-side seal bag, a four-side seal bag, and a self-supporting bag. Any part such as a plastic bag may be used, and the partial adhesive portion may be formed on the peripheral portion that is thermally bonded when the packaging bag is manufactured.

As the outer bag film 1, a biaxially oriented film having excellent strength, heat resistance and surface gloss, such as biaxially oriented polyethylene terephthalate, biaxially oriented nylon, and biaxially oriented polypropylene, is used. As the inner bag film 2,
Low density polyethylene on the inner surface of the gas barrier film,
A film having a configuration in which a heat-adhesive resin layer made of a linear low-density polyethylene, an ethylene-vinyl acetate copolymer, an ionomer, or the like is laminated is used. As the gas barrier film, a biaxially oriented polyethylene terephthalate or a laminate of biaxially oriented nylon and aluminum foil, a biaxially oriented polyethylene terephthalate or a biaxially oriented nylon having a metal deposited layer or a metal oxide deposited layer is used. .

As the adhesive resin layer 3, a hot-melt extruded layer of a polyolefin resin or an adhesive for urethane-based dry lamination can be used, but an adhesive layer made of low-density polyethylene having a density of 0.920 to 0.925 can be used. preferable.
By using a low-density polyethylene having a density of 0.920 to 0.925, the surface of the outer bag film 1 on which the adhesive layer 11 and the release layer 12 are formed and the inner bag film 2 are subjected to hot-melt extrusion and lamination, and Release layer 12 surface and density 0.920 ~
Since the adhesive strength with low-density polyethylene of 0.925 becomes extremely weak, the density in close contact with the release layer 12 by hot-melt extrusion lamination is 0.920 to 0.9.
Since the 25 low-density polyethylene layers are easily peeled off, it is possible to easily form a non-adhesion portion corresponding to the release layer 12. Further, it is preferable that the melting temperature at the time of hot-melt extrusion of low-density polyethylene having a density of 0.920 to 0.925 be about 300 ° C., which is lower than that at the time of ordinary extrusion lamination.

Adhesive layer formed on inner surface of outer bag film 1
Acrylic resin (MMA,
EMA), cellulosic resins (cellulose acetate, butyl cellulose acetate, propyl cellulose acetate), butyral resin, and the like can be used. Examples of the resin forming the release layer 12 include an ethylene-vinyl acetate copolymer, a urethane resin, and a polyamide resin. And those obtained by adding 0.01 to 1.0% of silicone oil to these resins. Urethane-based resins are preferred as inks for printing pictures.
At the same time as printing a pattern by gravure printing or the like using an ink made of these resins, an adhesive layer and a release layer are formed in a predetermined shape at a predetermined position in register with the pattern printed in the pattern printing process. Things.

The specific formula of the ink for the adhesive layer and the ink for the release layer is as follows: 30 parts of a polyamide resin (Versamide 940, Henkel Javan) 70 parts of a solvent (IPA: toluene = 1: 1) 70 parts of a mold release Layer ink MMA (Balloid A-11, Rohm and Haas) 20 parts Silicone (KP356, Shin-Etsu Silicone) 1 part Solvent (MEK: toluene = 1: 1) 79 parts or Adhesive layer ink Ethylene-vinyl acetate copolymer 10 Part (Evaflex 220, Mitsui Polychemicals) Solvent (Toluene) 90 parts Ink for release layer Cellulose acetate 5 parts (Acetate Flakes L-20, Daicel Chemical Industries) Silicon (KP356, Shin-Etsu Silicon) 1 part Solvent (MEK: Ethanol) = 9: 1) 94 parts.

In laminating the outer bag film 1 and the inner bag film 2 with the adhesive resin layer 3, a pattern layer, an adhesive layer 11, and a release layer 12 are formed on the inner surface of the outer bag film 1 by printing. The outer surface of the bag film 2 is subjected to extrusion lamination by hot-melt extrusion of a polyolefin resin such as low-density polyethylene, medium-low-density polyethylene, or polypropylene, or by dry lamination using a solventless urethane resin adhesive or the like. Done. As a resin to be subjected to hot melt extrusion lamination, the density is 0.920 to 0.9.
By using the low-density polyethylene of 25, the adhesion of the inner surface of the outer bag film 1 to the release layer 12 can be extremely weakened and a strong adhesive strength to the outer surface of the outer bag film 2 can be obtained. Because of the excellent properties, the production of the packaging material becomes easy.

Immediately after the outer bag film 1 and the inner bag film 2 are laminated, the adhesive strength between the release layer 12 formed on the inner surface of the outer bag film 1 and the adhesive resin layer 3 cannot be measured as a peel strength. Although the strength is weak, the release layer 12 and the adhesive resin layer 3 are in close contact with each other. The packaging material composed of the outer bag film 1 and the inner bag film 2 laminated as described above is peeled off in a post-process such as rewinding, slitting, and bag making, where the release layer 12 and the adhesive resin layer 3 are in close contact with each other. Can be done. When the adhesion between the release layer 12 and the adhesive resin layer 3 is strong, the region where the release layer 12 of the packaging material is formed in the slitting step or the bag making step is handled by using a metal roll or the like. Separation between the release layer 12 and the adhesive resin layer 3 can be promoted.

As a specific constitution of the packaging material, for example, biaxially stretched polyethylene terephthalate 25 μm / pattern layer / adhesive layer and release layer / extruded polyethylene 15 μm
/ Biaxially stretched nylon 15μm / Dry lamination /
Aluminum foil 9 μm / dry lamination / polyethylene 80 μm, biaxially stretched polyethylene terephthalate 25 μm / pattern layer / adhesive layer and release layer / urethane adhesive (dry lamination) / biaxially stretched nylon 15
μm / dry lamination / aluminum foil 9μm /
Dry lamination / polyethylene 80 μm, biaxially stretched polyethylene terephthalate 25 μm / pattern layer / adhesive layer and release layer / extruded polyethylene 15 μm / biaxially stretched nylon 15 μm / dry lamination / ethylene-
Vinyl alcohol copolymer 15 μm / dry lamination / polyethylene 80 μm, biaxially stretched polyethylene terephthalate 25 μm / pattern layer / adhesive layer and release layer /
Extruded polyethylene 15μm / biaxially stretched nylon 15μm
/ Aluminum deposited layer 500 nm / Dry lamination / Polyethylene 80 μm, Biaxially stretched polyethylene terephthalate 25 μm / Picture layer / Adhesive layer and release layer / Extruded polyethylene 15 μm / Biaxially stretched polyethylene terephthalate 12 μm / Aluminum deposited layer 500 nm / Dry lamination / Polyethylene 80 μm And so on.

As shown in FIG. 3, the vacuum packaging bag according to the embodiment of the present invention is a gusseted pillow-type bag formed by the jointed thermal bonding portion 6, the upper edge thermal bonding portion 7, and the lower edge thermal bonding portion 8. . It is filled with regular coffee powder, molded into a cube, and vacuum-packed. In this state, the outer bag film 1 and the inner bag film 2 constituting the vacuum packaging bag are partially formed in the region where the joint thermal bonding portion 6, the upper edge thermal bonding portion 7, and the lower edge thermal bonding portion 8 are formed. Since it is only adhered, the area other than the area where the joint thermal bonding part 6, the upper edge thermal bonding part 7 and the lower edge thermal bonding part 8 are formed is the non-bonding part 5, and the outer bag film 1 and inner bag film 2
And separated. Therefore, as shown in FIG. 4, the inner bag film 2 is in a state where the surface is uneven when the contents are filled and vacuum packaged, but the outer bag film is in a state where the surface is smooth and excellent. It forms the outer surface.

When the contents are filled and vacuum packaged, FIG.
As shown in (2), the surface of the inner bag film 2 is in a state in which irregularities are formed in a region other than the region where the palm joint thermal bonding portion 6, the upper edge thermal bonding portion 7 and the lower edge thermal bonding portion 8 are formed. ,
When the outer bag film 1 and the inner bag film 2 were laminated with the adhesive resin layer 3, there was a portion remaining in a state where the surface of the release layer 12 and the surface of the adhesive resin layer 3 were in close contact with each other without being separated. Even if
Since air enters through the concave portion on the surface of the inner bag film 2, the outer bag film 1 and the inner bag film 2
In the region where the release layer 12 is formed, the outer bag film 1 is completely separated and the outer bag film 1 has a smooth surface.

[0022]

According to the present invention, there is provided a packaging material in which an outer bag film and an inner bag film having a heat-adhesive resin layer on the inner surface are partially bonded at a bonding portion in a peripheral region, and the inner bag film has a bonding portion on an inner surface of the outer bag film. An adhesive layer is formed in a corresponding area and a release layer is formed in an area excluding an adhesive portion, and the inner surface of the outer bag film and the outer surface of the inner bag film are laminated via an adhesive resin layer to form an outer bag. This packaging material is used by using a packaging material having a configuration in which the film and the inner bag film are partially adhered in the region where the adhesive layer is formed and not adhered in the region where the release layer is formed. Since the outer bag film and the inner bag film are partially bonded to each other at the heat-bonded portion at the edge, the contents of the granular bag or the powdered coffee or the like are contained in the packaging bag. Filled and vacuum packed However, the inner bag film has irregularities due to the granular content, but the outer bag film is not adhered to the outer bag film because the inner bag film and the outer bag film are not bonded in the area other than the heat-bonded portion at the edge of the packaging bag. , And a smooth surface can be obtained, so that a vacuum packaging bag having excellent appearance can be obtained. Further, only by laminating the inner surface of the outer bag film on which the partial adhesive layer and the release layer are formed and the outer surface of the inner bag film via the adhesive resin layer, the outer bag film and the inner bag are formed in a region corresponding to the adhesive layer. Since the bag film can be partially adhered, the manufacturing process of the packaging material can be simplified and the manufacturing can be efficiently performed, so that the cost can be reduced.

In the above-mentioned packaging material, the release layer is formed on the inner surface of the outer bag film so as to correspond to a portion to be folded when the packaging material is made into a packaging bag. Due to this, the outer bag film and the inner bag film are weakly adhered to each other when they are laminated with the adhesive resin layer. The inner bag film and the inner bag film can be easily separated from each other so that the outer bag film and the inner bag film do not adhere to each other.

In the above packaging material, the adhesive resin layer is made of low-density polyethylene having a density of 0.920 to 0.925, so that the release layer formed on the inner surface of the outer bag film has a density of 0%. The adhesive layer made of low-density polyethylene of .920 to 0.925 is in a weakly adhered state immediately after lamination, but a release layer on the inner surface of the outer bag film is formed in a post-process such as slitting or bag making. Packaging material in which the outer bag film and the inner bag film can be easily separated from each other in the region where the adhesive layer is formed on the inner surface of the outer bag film. It can be.

The outer bag film and the inner bag film are partially adhered at the edge of the packaging bag obtained by making the above packaging material, and after the contents are filled inside, the vacuum is applied. By forming a vacuum packaging bag that is degassed and packed, even if the inner bag film has irregularities when the packaging bag is filled with contents such as regular coffee powder and vacuum packed, the outer bag can be used. Since the film and the inner bag film are not bonded, the surface of the outer bag film can be kept in a smooth state, and a package having excellent design properties can be obtained.

In the above vacuum packaging bag, the outer bag film is made of biaxially stretched polyethylene terephthalate, the inner bag film is made of a laminate of biaxially stretched nylon, aluminum foil and a heat-adhesive resin layer, and the shape of the packaging bag is The gusseted pillow type configuration ensures that when this packaging bag is filled with regular coffee powder, etc. and vacuum-packed, the inner bag has excellent pinhole resistance and the outer bag has excellent strength and gloss, so it is stored. A rectangular parallelepiped package excellent in properties and design can be obtained. In addition, by using the gusset pillow type, a package having a rectangular parallelepiped outer shape can be accommodated with a large amount of contents.

[Brief description of the drawings]

FIG. 1 is a plan view showing a packaging material according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along the line II in FIG. 1;

FIG. 3 is a perspective view showing a vacuum packaging bag made of the packaging material of the present invention.

FIG. 4 is a sectional view taken along the line II in FIG. 3;

FIG. 5 is a plan view showing a packaging material according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer bag film 11 Adhesive layer 12 Release layer 2 Inner bag film 3 Adhesive resin layer 4 Adhesive part 5 Non-adhesive part 6 Joint thermal adhesive part 7 Upper edge thermal adhesive part 8 Lower edge thermal adhesive part

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) B65D 30/08 B65D 30/08 33/01 33/01 75/30 75/30 B (72) Inventor Kenichi Asaoka Kyoto Inside Dai Nippon Printing Co., Ltd. (72) Inventor Takeshi Nishizono 10 Uzumasa Kamibecho, Ukyo-ku, Kyoto-shi

Claims (5)

[Claims] 1. A packaging material in which an outer bag film and an inner bag film having a heat-adhesive resin layer on the inner surface are partially bonded at a bonding portion in a peripheral region, wherein the bonding of the inner surface of the outer bag film is performed. An adhesive layer is formed in a region corresponding to the portion and a release layer is formed in a region excluding the adhesive portion, and an inner surface of the outer bag film and an outer surface of the inner bag film are laminated via an adhesive resin layer. Thereby, the outer bag film and the inner bag film are partially adhered in a region where the adhesive layer is formed, and are not adhered in a region where the release layer is formed. And packaging material. 2. The method according to claim 1, wherein the release layer has a structure formed on an inner surface of the outer bag film so as to correspond to a portion to be folded when the packaging material is formed into a packaging bag. The packaging material according to claim 1, characterized in that: 3. The adhesive resin layer has a density of 0.920 to 0.920.
The packaging material according to claim 1, wherein the packaging material is made of low-density polyethylene having a density of 0.925. 4. An outer bag film and an inner bag film are partially adhered at an edge portion of a packaging bag obtained by producing the packaging material according to claim 1. A vacuum packaging bag characterized by being vacuum-degassed and packed after the contents are filled therein. 5. The outer bag film is made of biaxially stretched polyethylene terephthalate, the inner bag film is made of a laminate of biaxially stretched nylon, aluminum foil and a heat-adhesive resin layer, and the shape of the packaging bag is gusset pillow. 5. The vacuum packaging bag according to claim 4, wherein the bag is a type.