JPH0648472A - Water resisting pack for quality retaining agent - Google Patents

Abstract

PURPOSE:To carry out the adjustment of the air permeability of quality retaining agent pack with a high degree of accuracy and the stabilization thereof and the maintenance of the printing patterns on the pack and of the safety and sanitation in use by a method wherein a finely-pored plastic film is laminated on one or two sides of the nonwoven fabric or porous film impermeable to water under normal pressure. CONSTITUTION:The quality retaining agent pack has a quality retaining agent packed and sealed therein to retain the quality of food, etc. In this case, an air-permeable packing material 4 having a fine-pored plastic film laminated on one or two sides of nonwoven fabric or a porous film impermeable to water under normal pressure is used wholly or partly in the pack. As for the plastic film, a heat resisting plastic film 1 and/or heat-sealable plastic film 5 is used. In this way is obtained the quality retaining agent pack whose air permeability can be adjusted with a high accuracy and also stabilized be adjusted with a high accuracy and also stabilized and which is not subjected to impairment of the printing patterns on the pack and is safe and sanitary in use for watery food.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a quality-preserving agent package used for maintaining the quality of foods and the like. More specifically, a breathable packaging material with perforated micropores is used for all or part of the package, The present invention relates to a quality-retaining agent package, which is obtained by packaging and sealing a quality-retaining agent. The quality-retaining agent package according to the present invention is a quality-retaining agent package such as an oxygen scavenger, a carbon dioxide gas absorbent, an ethylene absorbent, a rust preventive or a desiccant, and is used in foods such as foods, beverages and fruits and vegetables. In addition, it can be effectively used for quality preservation in a wide range of fields such as metal parts and pharmaceuticals.

[0002]

2. Description of the Prior Art Preservatives have recently come into widespread use for the preservation of foods and other articles. Particularly in the food field, oxygen absorber packages are often used.
In the case of an oxygen absorber package, unlike the conventional desiccant package, it is highly accurate to adjust the air permeability unlike the case where there is no problem even if there is variation if the air permeability is maintained above a certain level. Has become an important requirement. That is, when the target food is high in moisture and easily deteriorates in quality by oxygen, it is necessary to adjust the oxygen permeability of the oxygen scavenger package to be large and highly accurate to keep the oxygen absorption rate within a certain range. However, if there is a mixture of air permeability that has a large variation and oxygen absorption rate that is low, the quality of the food will deteriorate before absorbing oxygen, and the original purpose of maintaining quality cannot be achieved.

As described above, the air permeability of the oxygen absorber package is
Its oxygen absorption rate, the exchange of water with food, and the important thing to determine the oxygen absorption capacity, it has been desired to accurately adjust from low air permeability to high air permeability according to the characteristics of the target food. . In addition to the above-mentioned air permeability, water resistance, breakage resistance, safety and hygiene properties, food scent retention, appearance retention, etc. are important requirements according to the characteristics of a wide variety of foods.
In particular, unlike conventional desiccant packages, in the case of oxygen absorbers, the contents are likely to appear as rust and stains through the package, not only impairing the appearance but also unfavorable for safety and hygiene, maintaining appearance. Sex is an important requirement.

Conventionally, the packaging material for the oxygen scavenger is generally a paper and a polyethylene film with holes, which is heat-laminated.
The air permeability in this case was controlled by the porosity (pore diameter, number of pores) of the polyethylene film. However, in adjusting the air permeability, there are drawbacks such that the air holes are deformed and the air permeability becomes unstable at the time of thermal bonding during the production of the packaging material, and the oxygen absorption rate varies. In addition, if the porosity of the polyethylene film is increased in order to adjust the air permeability, there is a drawback that rust and stains increase. Furthermore, when this oxygen absorber is applied to foods with a high water content, the packaging material is inferior in water resistance, so the moisture may damage the oxygen absorber packaging bag, or the contents may pass through the holes in the perforated polyethylene film. May exude, which is not preferable in terms of food safety and hygiene.

As a packaging material for improving the above-mentioned drawbacks, Japanese Unexamined Patent Publication (Kokai) No. 57-194961 uses a non-woven fabric or a microporous membrane which is impermeable to water at normal pressure on one side and a thermoplastic synthetic resin laminate on the other side. The oxygen absorber packaging used is disclosed. In this case, there are drawbacks such that the air permeability is determined by the characteristics of the non-woven fabric and the necessary air permeability cannot be adjusted, and the direction of use is limited because one side is not air permeable. In addition, Japanese Utility Model Laid-Open No. 56-094324 and Japanese Utility Model Laid-Open No. 57-011765 disclose packaging materials in which a water-impermeable non-woven fabric or a microporous membrane is laminated with a plastic film on one side of which a plastic film is laminated. An oxygen package is disclosed. However, even in these cases, since the plastic film in which the holes have been formed is heat-bonded by a hot needle or the like, the holes may be deformed or blocked during bonding, so that a packaging material having a uniform air permeability in a desired range can be obtained. There is a drawback that it is difficult to obtain it stably. Further, there is a drawback in that the air permeability cannot be kept above a certain level due to the opening method and the bonding method, and the oxygen absorption rate cannot be increased. Further, since the holes have to be made large in order to secure the air permeability, there is a problem that it is difficult to distinguish the printing by the holes when the plastic film is printed. Also, in manufacturing packaging materials,
After opening the plastic film once, the process of thermal lamination is performed, but it has been pointed out that in each process, the processing speed is low and the productivity is poor.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems of the conventional packaging material and to enable stable adjustment from low air permeability to high air permeability with high accuracy. It has air permeability, good productivity, and it does not damage the printed pattern because it perforates micropores with a small pore size.
Moreover, it is to provide a quality-preserving agent package having no safety and health problem even when applied to humid foods.

[0007]

The present inventors have completed the present invention as a result of intensive studies in view of the problems of the prior art. That is, the quality-preserving agent package of the present invention comprises a breathable packaging material obtained by laminating and bonding a plastic film having micropores perforated on one or both surfaces of a non-woven fabric or a microporous membrane that is impermeable to water at normal pressure, or the entire packaging body. It is used as a part and is required to be packaged and sealed with a quality retention agent.

The present invention will be described in detail below. The nonwoven fabric or microporous membrane used in the present invention,
It has fine pores of 0.01 to 50 μm and has a Gurley type air permeability of 0.01.
It is ~ 10000sec / 100ml and impermeable to water at normal pressure. As a material for the microporous film, a synthetic resin such as polyethylene or polypropylene is used. This microporous membrane is a method of cold stretching a synthetic resin film, a method of stretching a synthetic resin film containing a foreign substance, a method of extracting a foreign substance from a synthetic resin film containing a foreign substance,
It is manufactured by means such as a method of extracting a foreign material from a synthetic resin film containing the foreign material and then stretching, a method of irradiating the film with an electron beam, and the like. Examples of such microporous membranes include Duraguard (made by Ceranizu), NOP (made by Nippon Petrochemical Co., Ltd.), NF sheet (made by Tokuyama Soda Co., Ltd.), and poll (made by Tokuyama Soda Co., Ltd.). ), Serpore (manufactured by Sekisui Chemical Co., Ltd.) and the like. The non-woven fabric is made of polyolefin, polyethylene terephthalate, or the like, and is a method of joining long fibers together by hot pressing after cross-dispersion of a bundle of fibers.
It is produced by a method such as wet calendering synthetic pulp and synthetic fiber and then heat calendering. Examples of such a non-woven fabric include Tyvek (manufactured by DuPont), Luxa (manufactured by Asahi Kasei Kogyo Co., Ltd.), Alto (manufactured by Awa Paper Co., Ltd.) and the like.

In the present invention, the following are used as the plastic film laminated and adhered to the microporous membrane or the nonwoven fabric. (1) Films made of polyethylene terephthalate, polyamide, polypropylene, polycarbonate, cellophane, polymethylpentene or polyvinyl alcohol, polyvinylidene chloride coated films, aluminum foil laminated films, and heat-resistant films such as aluminum vapor deposited films. (2) Polyethylene terephthalate, polyamide, polypropylene, polycarbonate, cellophane, films made of polymethylpentene or polyvinyl alcohol, polyvinylidene chloride coated various films, aluminum foil laminated films, and also heat-resistant films such as aluminum vapor deposited various films Polyethylene, polypropylene, ethylene acrylic acid copolymer resin, ethylene ethyl acrylate copolymer resin, ionomer, polybutadiene,
Shear consisting of ethylene vinyl acetate copolymer resin film, etc.
Laminated film made by laminating adhesive films. (3) A film of heat-sealable polyethylene terephthalate, polypropylene, or the like having a heat sealing property as a single film. (4) polyethylene, polypropylene, ethylene acrylic acid copolymer resin, ethylene ethyl acrylate copolymer resin,
A sealable film composed of an ionomer, polybutadiene, an ethylene vinyl acetate copolymer resin film, or the like. Although the above configuration is exemplified, the packaging material used in the present invention,
The present invention is not limited to the above examples, and other combinations can be used as long as the object of the present invention can be achieved.

The plastic film used in the constitution of the present invention preferably has a thickness of 10 to 100 μm from the viewpoints of wrapping suitability, handling strength, easiness of perforation, etc., but when a nonwoven fabric, a microporous membrane or the like is laminated, , Not limited to this.
Moreover, compounding various reinforcing materials for reinforcement is also appropriately implemented.

The method of laminating and bonding is not particularly limited, and dry laminating, extrusion laminating, heat laminating and the like can be freely selected. Further, the above configuration is not limited to being used as a film in advance, and for example, a polyethylene film layer is formed on a heat resistant film by extrusion lamination, or a laminated film is manufactured and used at one time by a coextrusion method. It is also possible.

In the above-mentioned structure, polyethylene terephthalate, polyamide, polymethylpentene, polypropylene or the like is preferably used as the heat-resistant film in consideration of packaging suitability, easiness of perforation, oxygen permeability and the like. Further, as the seal layer, preferably, ethylene acrylic acid copolymer resin, ethylene ethyl acrylate copolymer resin, ionomer, ethylene vinyl acetate copolymer resin film is used. When printing the breathable packaging material used in the present invention, it is preferable to print on the back side of the transparent plastic film on the surface for safety and hygiene.

The structure of the breathable packaging material used in the present invention is exemplified as follows. (1) Non-woven fabric that is impermeable to water under normal pressure or a microporous membrane laminated with a heat-resistant plastic film with microporous holes laminated on one side (Fig. 1) (2) Non-woven fabric or micro-film that is impermeable to water under normal pressure Laminated material obtained by laminating and adhering a heat-sealing plastic film having micropores perforated on one side of a porous membrane (Fig. 2) (3) Non-woven fabric impermeable to water under normal pressure or micropores perforated on one side of the microporous membrane Laminated material in which heat-resistant plastic films are laminated and adhered, and a heat-sealing plastic film with micropores perforated on the other surface is laminated and adhered (Fig. 3).

In the present invention, as the method for forming the non-penetrating micropores, including mechanical pretreatment, mechanical perforation method, laser light perforation method, electron irradiation perforation method, plasma perforation method, high pressure discharge. Although various perforation methods such as the perforation method can be applied, the high-pressure discharge perforation method is preferable and effective.

As the high-pressure discharge perforation method, any of the spark gap method, the vacuum tube method and the solid state method can be applied, but the solid state method is the preferred method. The perforation by the high-pressure discharge perforation method is performed by passing a target packaging material while applying a high voltage between the discharge electrode and the dielectric roll to cause electric discharge. And the perforation density is
It is appropriately adjusted according to the distance between the discharge electrode and the dielectric roll, the voltage, the shape of the discharge electrode, the characteristics of the dielectric roll, and the like.
In this case, adjustment is also required depending on the thickness of the material to be punched, the material, and the passing speed.

In order to perforate the micropores of the present invention, it is not sufficient to simply apply a high voltage between the discharge electrode and the dielectric roll to allow the target packaging material to pass while discharging, and various measures are taken. Will be needed. As one of the pretreatments, it is also effective to perform a pretreatment step of mechanically making fine scratches with a file-shaped roll or the like before discharge perforation. Alternatively, it is also effective to carry out discharge perforation after forming a polar group on the film surface by acid treatment. Further, since a local discharge part is provided in the dielectric roll, it is possible to disperse the missing part in the covered dielectric layer or to form a dielectric layer in which a conductive material is dispersed to reduce the perforation density and perforation depth. It is effective for adjustment.

The material of the electrode used is aluminum, stainless steel or the like, but aluminum is preferably used. As the shape of the electrode, a knife edge type, a bar type, a shoe type or the like is used, but a knife edge type or a type in which the tip of the discharge part is made into a large number of needles is preferable. The processing power needs to be adjusted depending on the thickness, material, passing speed, etc. of the perforation target packaging material, but is carried out, for example, in the range of 5 to 200 W / m ² / min. The drilling direction is such that the residual film portion side is in contact with the dielectric roll.

The gas permeability represented by the oxygen permeability of the liquid-permeation-resistant packaging material according to the present invention can be suitably adjusted by the perforation density and the pore diameter when the packaging material is perforated. The perforation density is in the range of 1,000 to 10,000,000 holes / cm ² , and preferably 10,000 holes / cm ² or more, more preferably 50,000 holes / cm ^{2 in} order to secure sufficient oxygen permeability.
Perforated in a range of ² or more.

The pore size is similarly adjusted in consideration of the oxygen permeability, the packaging material strength, etc., but if the pore size is too large at the time of printing, it becomes difficult to distinguish the printed pattern, and thus it is usually 500 μm.
The following is preferably adjusted in the range of 200 μm or less, and more preferably in the range of 100 μm or less.

When perforating a laminated packaging material, it is necessary to perforate the film to be perforated completely, but even if the perforations reach the laminated paper or nonwoven fabric, the function of the breathable packaging material can be improved. There is no problem as long as it does not interfere with. When there are films to be punched on both sides, it is possible to punch one side or both sides simultaneously.

The air permeability of the breathable packaging material used in the present invention is adjusted to a desired range depending on the use of the quality retention agent. By carrying out the perforation by the above method, it becomes possible to accurately adjust the air permeability, which has been difficult in the past, and it becomes possible to achieve a large air permeability which cannot be obtained by the plastic film packaging material.

In order to produce a liquid-resistant quality-preserving agent package using the liquid-permeation-resistant packaging material, a three-way seal method or a four-way seal method is generally used. Three-way series
In the sealing method, the packaging material is introduced into a three-way seal type automatic filling and packaging machine, folded in two with the sealing layer side facing inward, and the peripheral portion of the bag is heat-sealed while an appropriate amount of oxygen scavenger or It is manufactured by filling contents such as other quality retention agents. 4-way series
In the sealing method, two sets of packaging materials are guided to a four-way seal automatic filling and packaging machine while facing each other with the sealing layer facing inside, and the peripheral portion of the bag is heat-sealed and contents such as oxygen absorber are contained. It is manufactured by filling.

As the quality preserving agent according to the present invention, a package of an oxygen absorber, a carbon dioxide gas absorbent, an ethylene absorbent, a rust preventive agent, etc. is used depending on the purpose of maintaining the quality of foods, fruits and vegetables, metal parts, pharmaceuticals and the like. It Examples of the quality retention agent include oxygen scavengers, and examples of the oxygen scavenger include sulfite, bisulfite, dithionite, hydroquinone, catechol, resorcin, pyrogallol, gallic acid, rongalit, and ascorbine. A composition containing an acid and / or a salt thereof, isoascorbic acid and / or a salt thereof, sorbose, glucose, lignin, dibutylhydroxytoluene, butylhydroxyanisole, a ferrous salt, or a metal powder such as iron powder. With the deoxidizing ability,
Those having a carbon dioxide generating deoxidizing ability or a carbon dioxide absorbing deoxidizing ability are used.

The shape of the quality-retaining agent is powder, granules, lumps,
It does not matter whether it is a sheet or the like. Further, a sheet obtained by mixing an oxygen absorber with pulp or the like to form a sheet, a sheet obtained by mixing with a thermoplastic resin or the like and then made into a sheet, and a deoxidant material obtained by blending a polymer material and a metal catalyst are also used. The quality preserving agent is not limited to the shape, composition, etc.

[0025]

EXAMPLES Next, more detailed description will be given with reference to examples.
The present invention is not limited to this embodiment. Example 1 Polyethylene terephthalate film (thickness 12 μm)
After printing characters and white solid on the back surface of the, the porous film porous (made by Tokuyama Soda Co., Ltd., thickness 100 μm) with 100 m
A dry lamination was performed at a speed of 1 / min to obtain a laminated sheet which was laminated and adhered. This laminated film was perforated with a solid-state type electric discharge machine to form micropores having a pore size of 2.5 μm and an opening density of 50,000 pores / cm ² to obtain a breathable packaging material. 10
The breathable packaging material slit to a width of 0 mm was introduced into a three-way seal type automatic filling and packaging machine, folded in half with the non-woven fabric side inside, and the peripheral edge of the bag was heat-sealed while iron-based oxygen scavenger was used. 3 g
Was filled and packaged to obtain a 50 × 50 mm oxygen absorber package. This oxygen absorber package was placed on absorbent cotton impregnated with 10 ml of water, sealed in a bag made of vinylidene chloride 200 × 300 mm stretched nylon / polyethylene with 250 ml of air, sealed and sealed at 25 ° C. Stored in. Then, the oxygen concentration in the bag was measured over time using an oxygen analyzer, and the time required for deoxidation until the oxygen concentration reached 0.1% or less was calculated.

Comparative Example 1 Polyethylene terephthalate film (thickness 12 μm)
After character printing and white solid printing were performed on the back surface of the product, an ethylene vinyl acetate copolymer film (EVA) was extrusion-laminated to a thickness of 15 μm to obtain a laminated film. On this laminated film, 10 holes with a hole diameter of 0.7 mm were made with a hot needle with a needle diameter of 0.5 mm.
A breathable film was obtained by punching at a density of holes / cm ² . This air-permeable film and microporous membrane porous film (manufactured by Tokuyama Soda Co., Ltd., thickness 100 μm) were combined with the EVA side of the air-permeable film and the microporous membrane, and heat was applied from the polyethylene terephthalate film side of the air-permeable film. Thermal lamination was performed at a speed of 20 m / min to obtain a breathable laminated sheet. Using this air-permeable sheet, an oxygen absorber package was prepared in the same manner as in Example 2 and subjected to the same test. The results are shown in Table 1 together with the results of Example 1. In addition, the polyethylene terephthalate film, a breathable film with hot needle holes,
Adhesion by dry lamination was tried in the same manner as in Example 1, but it was impossible to make the adhesive sticky to the roll because of the presence of the perforated portion.

[Table 1]

From the above results, in the examples, the workability was good, the time required for deoxidation was small, and the micropores were perforated, but the hole diameter was small, so the printed pattern was clear. On the other hand, in the comparative example, dry laminating is difficult, and a low-speed thermal laminating process is performed after laminating the EVA layer. Therefore, not only the productivity is inferior, but also the pores are partially blocked during the thermal laminating and the deoxidation time varies. There has occurred.

[0028]

EFFECTS OF THE INVENTION According to the present invention, the problems of conventional products are solved, the air permeability is small, and the water resistance is good.
A quality-retaining agent package having high productivity and excellent safety and hygiene can be obtained. That is, various laminate methods with excellent productivity can be adopted, and by perforating fine pores after lamination processing, it is possible to eliminate the cause of air permeability variation in perforation processing and laminating process, Since the hole diameter is small, it is possible to achieve clear printing without leakage or bleeding of the contents. Further, it is possible to perforate up to a large air permeability. The quality-preserving agent package according to the present invention is used as a package for deoxidizing agents, carbon dioxide absorbents, ethylene absorbents, rust preventives, desiccants, etc., for maintaining quality of foods, fruits and vegetables, metal parts, pharmaceuticals, etc. It can be used effectively.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a breathable packaging material composed of a laminated sheet of heat resistant film / microporous membrane or nonwoven fabric.

FIG. 2 is a cross-sectional view of a breathable packaging material composed of a microporous membrane or a non-woven fabric / low softening point film laminated sheet.

FIG. 3 is a cross-sectional view of a breathable packaging material composed of a laminated sheet of heat resistant film / microporous film or nonwoven fabric / low softening point film.

FIG. 4 is a cross-sectional view of a quality preservation agent package using a breathable packaging material.

[Explanation of symbols]

 1 Heat Resistant Film 2 Microporous Membrane or Nonwoven Fabric 3 Microporous 4 Breathable Packaging Material 5 Heat Sealing Film 6 Quality Retaining Agent or Sheet Quality Retaining Agent

Claims (4)

[Claims] 1. A breathable packaging material obtained by laminating and adhering a plastic film having perforated micropores on one or both sides of a non-woven fabric or a microporous membrane that is impermeable to water at normal pressure for the whole or a part of a package, and quality. A quality-retaining agent package, which is obtained by packaging and sealing a retaining agent. 2. The quality-preserving agent package according to claim 1, wherein the breathable packaging material is a non-woven fabric impermeable to water under normal pressure or a laminated material obtained by laminating and adhering a heat-resistant plastic film having micropores perforated on one surface of a microporous membrane. body. 3. The quality of claim 1, wherein the breathable packaging material is a non-woven fabric impermeable to water under normal pressure or a laminated material obtained by laminating and adhering a heat-sealing plastic film having micropores perforated on one surface of a microporous membrane. Retention agent package. 4. A heat-sealing sheet, wherein the breathable packaging material is a water-tight non-woven fabric or microporous membrane, and a heat-resistant plastic film having micropores perforated on one surface thereof is laminated and adhered, and the other surface has micropores perforated. The quality-preserving agent package according to claim 1, which is a laminated material obtained by laminating and bonding a flexible plastic film.