JPS60240664A - Packaging material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to packaging materials. More specifically, a non-breathable outer material made of plastic film (1), a sealing layer (2)
) 1 A breathable inner material (3) and a breathable sealing layer 14) are laminated and bonded, and only the cross section of the packaging material is breathable.This invention relates to (6).

Conventionally, breathable packaging materials have been used as desiccants, insect repellents, etc., but recently they have come to be used as quality-preserving agents for various articles, such as oxygen absorbers and freshness-preserving agents.

Since these quality preservatives are mainly used in the food field, important requirements for breathable packaging materials include water resistance, breakage resistance, and safety and hygiene in addition to breathability. Ta.

For example, the packaging material for oxygen absorbers has conventionally been a laminate of paper and perforated polyethylene film, and the air permeability in this case has been adjusted by the porosity of the polyethylene film.

However, when this oxygen absorber is applied to foods with a high moisture content, conventional packaging materials are not water resistant, so the packaging material becomes damp and the oxygen absorber packaging bag is damaged or the holes in the perforated polyethylene are exposed. The contents may ooze out through the process, which is unfavorable in terms of food safety and hygiene.

Furthermore, even when adjusting the air permeability, the air permeability becomes unstable due to the deformation of the air holes during thermal bonding during the production of the packaging material, resulting in variations in the oxygen absorption rate.

As a packaging material that improves the above drawbacks, JP-A-53-51
No. 096 discloses a packaging material in which holes are made in two plastic films having different melting points, and the films are stacked on top of each other or laminated and bonded with paper sandwiched between them.

Also, JP-A-56-124440 or JP-A-56-12
No. 444 similarly discloses a packaging material using a plastic film with holes in its surface.

In these cases, one surface is made of plastic film, so it has better water resistance than paper, but it has many holes for breathability, so it can be used for humid foods. That is, when the packaging material comes into contact with food containing a large amount of water, the packaging material becomes wet and the contents ooze out, resulting in safety and health problems.

In addition, since the packaging material had many holes, its strength was low.

Furthermore, since thermal bonding or adhesives are used during the production of packaging materials, there are drawbacks such as holes being deformed and air permeability changing due to the influence of the adhesive.

In addition, when applied to humid foods, the plastic film on one surface and the paper may peel off, making it impossible to use it as a packaging material for oxygen scavengers or alcohol-based freshness-preserving agents.

The inventors of the present invention have completed the present invention as a result of intensive research into packaging materials that do not cause health and safety problems even when applied to humid foods, are strong, durable, and have stable air permeability. Ta.

When the packaging material according to the present invention is used to make a bag for use as an oxygen absorber, desiccant, etc., one bag is produced because the packaging material uses a non-porous non-porous plastic film as the outer material. Because of its high water resistance and great strength,
The contents do not ooze out, and the packaging material according to the present invention can be printed on the back side, which is sanitary and safe because there is no direct contact between the food and the ink.

In addition, ventilation of the packaging material according to the present invention is not performed through holes on the surface of the plastic film, but rather through the packaging material (
Since this is carried out through the cross section of the inner material (3) having air permeability in step 6), the air permeability of one bag is stable with little variation.

In the present invention, the non-breathable outer material (1) made of a plastic film preferably has a high strength from the viewpoint of manufacturing or use of the package.For example, a film of polyethylene terephthalate, polyamide, polypropylene, polycarbonate, or cellophane is used. It will be done.

Among these, polyethylene terephthalate film or polyamide film is preferred in consideration of strength, ease of handling during manufacture, and the like.

The thickness of the outer material (No. 11) is preferably 50 microns or less from the viewpoint of ease of handling during production, and most preferably 10 to 20 microns.

In addition, the film has an oxygen permeability of 1000cc/r.
d ・2411r-atm or less is preferable, especially 500r-atm or less
Films of cc/rtr・2411r-atm or less are preferred.

In the case of the packaging material according to the present invention, since the printing is performed on the back side of the outer material (1), the ink does not come into direct contact with the food, so it is hygienically safe.

Furthermore, it is possible to perform solid printing on top of single character printing, and even if the contents ooze out onto the breathable inner material (3), there will be solid printing, that is, concealment printing. The appearance of the package will not be impaired.

The sealing layer (2) is for bonding the outer material (1) and the inner material (3) when manufacturing the package.
2) Examples include polyethylene, polyethylene vinyl acetate copolymer, ionomer resin, polybutadiene,
Alternatively, a plastic film such as vinyl chloride or a heat sealant is used.

In this case, the heat sealing agent used is, for example, a conventional hot melt agent, hot melt emulsion, ionomer latex, ionomer emulsion, polyethylene emulsion or ethylene vinyl acetate emulsion.

If Seal N (2) is a plastic film.

The thickness of the film is generally 10-70 microns, preferably 15-40 microns.

In addition, the amount of heat sealant applied is generally 0.5g/d~
30g/+vf, preferably 5g/i to 20g/i
− is.

The seal N (2) is used by being laminated or coated in close contact with the outer material (1) made of a non-porous, non-porous plastic film. The length of the seal N (2) is not limited to 1 m, and two seal layers may be used depending on the adhesion between the outer material (1) and the inner material (3) during bag making.

In this case, a common method is to apply a heat sealant to the surface of the inner material (3).

In the present invention, the inner material (3) having 9 air permeability is 1
Paper or non-woven fabric is used. In this case, it is possible to use any paper such as Japanese paper, rayon mixed Japanese paper, Western paper, etc., but considering the adhesiveness with the external material (1),
Among these papers, Japanese paper or rayon-mixed Japanese paper is preferred.

Also, for the paper used, for example, in the case of Japanese paper, the weight of 1 tsubo is 15
~100g/n? are used.

As the nonwoven fabric, any nonwoven fabric such as wet type, dry type or spunbond type nonwoven fabric can be used, and various materials such as polyamide, polyethylene terephthalate, and rayon are used.

゛ The feature of the present invention is that the outer material (1) is made of a non-porous plastic film that does not have holes, and the inner material (3) is made of a breathable inner material (3). The point is that it is breathable from all directions.

Therefore, the air permeability of a package using the packaging material according to the present invention is mainly controlled by the quality and thickness of the paper or nonwoven fabric, the cross-sectional area of the cut portion of the package, etc.

In order to impart water repellency or oil repellency to these papers or nonwoven fabrics, it is possible to use paper or nonwoven fabrics coated with a water repellent or oil repellent.

In the present invention, the sealing layer (4) having 5 air permeability is made by making holes in a film made of polyethylene, polyethylene vinyl acetate copolymer, ionomer, polybutadiene, vinyl chloride, etc., similar to the sealing layer (2). A sealing layer that is pasted to the inside of the inner material (3), or a sealing layer that is made with holes after being pasted to provide breathability, or a heat sealant that is applied to the inside of the inner material (3) to make it breathable. This means a layer of sealing material. Note that if the heat sealant is coated on the entire surface and air permeability is inhibited, a pattern-coated one is used.

It is generally preferable to have as many pores as possible in the sealing layer (4) as long as it does not impede adhesion, and in this case the porosity is generally 0.2 to 30%, preferably 1 to 20%. %.

Furthermore, if it is desired to make the air permeability of the package extremely low, this can be done by lowering the porosity of the sealing layer (4) and adjusting the paper quality or thickness.

In order to increase the strength of the package, for example, split fibers may be laminated and bonded in close contact between the inner material (3) and the seal ii 14) or on the inside of the seal M (4).

A breathable packaging body using the packaging material according to the present invention has the following characteristics:
It is used for various purposes such as base agent, desiccant, insect repellent, and alcohol-based freshness-preserving agent.

In the present invention, the oxygen scavenger is sulfite.

Bisulfite, dithionite, hydroquinone.

Catechol, resorcinol, pyrogallol, 't1 edible acid, longalisotho, ascorbic acid, isoascorbic acid and its salts, sorbose, glucose, lignin, dibutylhydroxytoluene.

Oxygen scavengers containing metal powder such as butylhydroxyanisole, ferrous salts, or iron powder, as well as carbon dioxide gas-generating type oxygen agents or carbon dioxide absorption type skin oxygen agents, are used.

Furthermore, when food is preserved using the packaging material according to the present invention, that is, the packaging material that has air permeability only in the cross section of the packaging material, the effect of retaining aroma is superior to that when conventional packaging materials are used. It has a particularly remarkable effect on preserving the aroma of coffee, tea, yam kelp, etc.

The present invention will be explained in more detail with reference to Examples below.Example 1 A 12 micron thick polyethylene terephthalate film (outer material (1
)) with a 15 micron thick polyethylene sealing layer (
2) Laminated film extruded and laminated, basis weight 5
0g/cd Japanese paper (inner material 13)), hole diameter 1
Medium 1 made by laminating a perforated polyethylene film (sealing layer (4)) with pores uniformly distributed in mm and a porosity of 10%.
A 100fi laminated packaging material was prepared.

This packaging material is guided to a three-sided seal automatic filling packaging machine (4
) while filling 1.5 g of iron-based oxygen absorber inside the (1
) was sealed from the outside with a bar heater and cut to obtain an oxygen absorber package with dimensions of 50 x 50 m.

As a comparative example, a packaging material made by laminating pure white paper (basis weight 50 g/rrr) and the same perforated polyethylene film as above was used, and 1.5 g of iron-based oxygen scavenger was filled in to make a 50X50++
An oxygen absorber package of m was obtained.

These oxygen absorber packages were placed on a water-containing line made by soaking 2 g of absorbent cotton with 10 cc of water, and 500 cc of air was added. : Both K
It was sealed in an OPlPH bag and stored in a constant temperature bath at 35°C.

The oxygen concentration after 2 days was analyzed, and the state of the oxygen absorber was observed after 14 days. The results are shown in Table 1.

Table 1 Example 2゜ Laminated film (seal) made by extruding and laminating polyethylene to a thickness of 15 mm on a 12 mm thick polyethylene terephthalate film (outer material (1)) with text printing and white solid printing on the back side. Layer (21)
, Japanese paper (inner material (3) basis weight 40g/rrf) and the diameter of the pores is ln+m, the pores are evenly distributed, and the porosity is 1
2% perforated polyethylene film (sealing layer (4)
) was laminated and bonded together to prepare a laminated packaging material with a width of 80 mm.

This packaging material was introduced into a three-sided seal automatic filling packaging machine, filled with 2 g of quicklime, sealed with a bar heater, and cut to obtain a desiccant package with dimensions of 40 x 5 Qm.

As a comparative example, Japanese paper (basis weight 50g/nf) and porosity 12
% and a polyethylene film with a thickness of 30 microns, and 2 g of quicklime was filled into the packaging material to obtain a desiccant package of 40×50 size in the same manner as in the example.

These desiccant packages were placed on a water-containing line made by moistening 2 g of absorbent cotton with 10 cc of water, and KOP/
It was sealed in a PE bag and stored in a constant temperature bath at 35°C.

After 2 days, the wet cotton that had been in contact with it was taken out, and several drops of 171% alcoholic solution of phenol phthalate were added dropwise.

As a result, in Example 1, the color did not change, but in Comparative Example, the color changed to red, and elution of alkaline components was observed.

Regarding the appearance of the desiccant package, there was no abnormality in the example, but the entire surface of the desiccant package was wet in the comparative example.

Example 3 A 12 micron thick polyethylene terephthalate film (outer material (1
)) with a 15 micron thick polyethylene sealing layer (
2)) Laminated film extruded and laminated and basis weight 5
0g/rrf Japanese paper (inner material (3)) and hole diameter 1
Width 12mm made by laminating a perforated polyethylene film (sealing layer (4)) with a uniform distribution of holes and a porosity of 10%.
A 0 mm laminated packaging material was prepared.

This packaging material is guided to a three-sided seal automatic filling packaging machine (4
) was filled with a carbon dioxide absorbing type oxygen scavenger in an amount of 4°08 each, sealed from the outside of (1) with a bar heater, and cut to obtain an oxygen scavenger package with dimensions of 60 x 60 squares.

As Comparative Example 1, a carbon dioxide absorbing oxygen scavenger 4. Filled with Og and 60x
A 60 mm oxygen absorber package was obtained.

In addition, as Comparative Example 2, a polyethylene terephthalate film (thickness: 12 microns) and a polyethylene film (thickness: 15 microns) were laminated together. % perforated laminated film, the same Japanese paper as in Example 3, and a perforated polyethylene film with a thickness of 100 mm, each bag was filled with 4 g of a carbon dioxide absorbing oxygen scavenger.
An oxygen absorber package of 0x60 mm was obtained.

These oxygen absorber packages were sealed together with 10 g of powdered roasted coffee in an ON/aluminum/PE bag and stored in a high temperature bath at 60°C. Further, as Comparative Example 3, only the coffee was sealed and stored without enclosing the oxygen absorber package.

Along with analyzing the oxygen concentration inside the bag after 70 days.

The package was opened and the scent retention effect was confirmed through a sensory test.

Table 2

[Brief explanation of the drawing]

FIG. 1 shows the structure of a packaging material (6) according to the invention.
In the drawings, 1 is a non-breathable outer material made of plastic film (11, 2 is a seal layer (2); 3 is a breathable inner material (31, 4 is a breathable seal M (4); 5 is a breathable seal layer (2); (4) and 6 indicate the packaging material (6), respectively. Figure 2 shows a cross-sectional view of the breathable packaging with the sealing layer (4) of the packaging material (6) inside. , 7 shows the inclusions.Representative: Nagano Washo #1 Figure Hata 2 Figure !) 6 4/7

Claims (1)

[Claims] non-breathable outer material made of plastic film (1);
Packaging material (6) characterized by laminating and bonding a sealing layer (2), a breathable inner material (3), and a breathable sealing layer (4).