JPH03200546A - Package of oxygen absorbent - Google Patents

Abstract

PURPOSE:To improve ability of oxygen absorption by using a specific plastic laminate film consisting of a porous film selected from the group of a nonwoven fabric water-impermeable at normal pressure, a fine-pored plastic film and a water and oil resisting converting paper and a specific porous film made from the resin having a softening point not high than that of the aforesaid porous film, both being bonded together. CONSTITUTION:A porous film 1 is one member selected from the group consisting of a nonwoven fabric water-impermeable at normal pressure, a fine- pored plastic film and a water and oil resisting converting paper and the fine- pored film 2 consists of the resin having a softening point not higher than that of the film 1 and has Gurley permeability of 0.1-1000sec/100ml. A plastic laminate film consists of the film 1 and the fine-pored film 2 heat sealed together and has a Gurley permeability of 1-10000sec/100ml. The above features provides a stable permeability and can improve ability of oxygen absorption and adhesive strength.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an oxygen absorber package, and more particularly, the present invention relates to an oxygen absorber package, and more specifically, the present invention relates to an oxygen absorber package, and more specifically, an oxygen absorber packaged in a packaging material having a specific laminate structure and a specific air permeability. This invention relates to a packaged oxygen absorber package.

The present invention not only facilitates the production and bag making of the oxygen absorber packaging material that constitutes the oxygen absorber packaging material, but also enables the oxygen absorber packaging material to have stable air permeability, lamination strength, seal strength, and water resistance. It exhibits stable oxygen scavenging performance due to its excellent durability such as acid resistance and alcohol resistance, and is suitably used as a preservative for many processed foods.

[Conventional technology]

Oxygen scavengers are made of a composition that has the property of absorbing oxygen, and are usually used by being enclosed in a breathable pouch.

In general, the packaging materials that make up breathable sachets include, for example:
Packaging materials in which paper and perforated polyethylene film are laminated, packaging materials in which perforated plastic film, paper, and perforated polyethylene film are laminated and bonded together, and packaging materials using nonwoven fabrics, microporous membranes, and the like are used.

[Problem to be solved by the invention]

Oxygen absorber Packaging materials have a technical problem in preserving oxygen absorbers. Oxygen absorbers are used in various foods such as dry foods, high-moisture foods, acidic foods, oil-processed foods, and alcohol-containing foods. Moisture contained in the oxygen absorber composition transfers to dry foods, impairing oxygen scavenging performance, and moisture from high-moisture foods transfers to the oxygen scavenger composition, causing stains on the surface of the packaging material and impairing its appearance. Food oils may seep into the packaging material, impairing its air permeability and deoxidizing performance. Due to these drawbacks, the material composition of the packaging material is changed depending on the situation in which the oxygen absorber is used.
It is not a perfect packaging material for oxygen absorbers.

In recent years, oxygen scavengers have been applied to a wide range of fields and the conditions of use have become harsher and harsher, so highly durable packaging materials using microporous membranes and the like have come into widespread use.

In addition, it is common for film lamination to be thermally laminated using a low melting point sealant film made of polyethylene, polyethylene vinyl acetate copolymer, ionomer resin, etc. as an adhesive layer; It is difficult to provide stable air permeability because the low melting point film melts and the pores in the sealant film become clogged, reducing air permeability.

Furthermore, if low temperature lamination conditions are used to ensure air permeability, sufficient lamination strength cannot be obtained.

In other words, with conventional thermal lamination processing methods, it is easy to manufacture packaging materials and form bags, and it has stable air permeability, lamination strength, and sealing strength, as well as durability such as water resistance, acid resistance, and alcohol resistance. It is difficult to process packaging materials for oxygen scavengers that exhibit excellent and stable oxygen scavenging performance.

On the other hand, as packaging materials using microporous films such as nonwoven fabrics, microporous membranes, and water- and oil-resistant treated papers, low-melting point sealant films made of polyethylene, polyethylene vinyl acetate copolymers, ionomer resins, etc. are applied to these microporous films. Heat lamination is often used, but during heat lamination, the low melting point film melts and the holes made in the sealant film are closed, reducing air permeability and ensuring stable air permeability. However, it was unsatisfactory as a packaging material for oxygen absorbers because it was difficult to obtain sufficient lamination strength when low-temperature lamination conditions were used to ensure air permeability.

The present invention is easy to manufacture and form bags, has stable air permeability, sealing strength, and lamination strength, and has water resistance and
An object of the present invention is to provide an oxygen absorber package in which an oxygen absorber is packaged using a packaging material for an oxygen absorber that has excellent durability such as acid resistance and alcohol resistance, and exhibits stable oxygen scavenging performance.

[Means to solve the problem]

As a result of intensive research aimed at distantly related to the above-mentioned object, the inventors of the present invention have found that microporous films such as nonwoven fabrics, microporous membranes, and water- and oil-resistant treated paper are laminated with resin films other than sealant films having a lower melting point than these films. It was discovered that a laminated film with excellent air permeability could be obtained by doing so, and the present invention was completed.

The present invention provides a film (A) having one kind of micropores selected from the group consisting of a nonwoven fabric that does not pass water under normal pressure, a microporous plastic film, and a water- and oil-resistant treated paper; A microporous membrane (B) with a Gurley air permeability of 0.1 to 1.000 seconds/100-, which is made of a resin having a softening point equal to or lower than the above, is laminated with a Gurley air permeability of 1.
A packaging material made of a plastic laminated film (C) with a speed of ~10,000 seconds/100- is used as all or part of the packaging material for an oxygen absorber, and the oxygen absorber is placed with (A) of the packaging material on the outside. This is a package for an oxygen absorber characterized by being packaged and sealed. (See Figure 3) In the present invention, the film with micropores <A) is one type selected from the group consisting of nonwoven fabrics that do not allow water to pass through under normal pressure, plastic films that are microporous membranes, and water- and oil-resistant treated paper. It is.

Nonwoven fabrics that do not allow water to pass through under normal pressure have a Gurley air permeability of 0.
It is a nonwoven fabric made of polyolefin, polyester, etc., which has an air permeability of about 01 to 1.000 seconds/100- and does not allow water to pass through at normal pressure, such as Tyvek (manufactured by DuPont).
, Luxar (manufactured by Asahi Kabo Kogyo Co., Ltd.) and other commercially available products.

Plastic films, which are microporous membranes, are produced by stretching a synthetic resin film such as polyethylene or polypropylene, by adding fine powder such as silica, talc, or calcium carbonate, stretching the film, and extracting the fine powder from the film. The pore size produced by a method such as extraction is 0.01~
Gurley type air permeability with 50μm micropores is 0.1~
It is a plastic film that does not allow water to pass through under normal pressure of about 1.000 seconds/100. For example, NF Receipt (manufactured by Tokuyama Soda ■), Bolam (manufactured by Tokuyama Soda ■), Cellpore (manufactured by Tanemizu Chemical Industry ■), FP-2 (manufactured by Asahi Kakogyo ■), N
OP (manufactured by Nippon Petrochemical IJ@), Nidoflon NTF
Commercially available products include (manufactured by Nitto Electric Industries, Ltd.), Polyfuronpeno (manufactured by Daikin Industries, Ltd.), Duraguard (manufactured by Celanese Corporation), and Coatex (manufactured by Boa Corporation).

Water and oil resistant treated paper is generally oil resistant paper, moisture resistant paper, moisture resistant paper,
This is called water-resistant and water-repellent paper. Specifically, coated printing paper (art paper, coated paper, gravure paper, etc.), information recording paper, electrical insulation paper, release paper, release paper, corrugated paper, folding carton paperboard, base paper for decorative laminates, processing for food packaging. Among various papers such as paper and carton paper for food packaging, mainly those belonging to processed paper for food packaging, and paper and plastic paper.
Tsuku mixed paper is suitable. In addition, processed paper includes chemically treated paper that has been acid-treated such as parchment paper, WS paper, MC paper, filter paper, glassine paper, WO2 paper that has synthetic resin added during the papermaking process, and coated paper. Papers include paper (wax paper, fluorine-processed paper, vinylidene chloride-processed paper, PVC-processed paper, PE-processed paper, lacquer coated paper, etc.), laminated paper, and other papers that are processed by physical processing after papermaking.

A suitable processed paper has a basis weight of 10 = 100 g/m'.

Preferably, the paper is made of cardboard having a weight of 20 to 60 g/m' and has been treated to be water and oil resistant by the method described above. If the basis weight is too small, workability and durability will be lacking, and if it is too large, the packaging material will be stiff and difficult to fill with an oxygen scavenger.

On the other hand, the microporous film (B) to be bonded to the film having micropores (A) has a softening point equal to or lower than that of the film used in (A), preferably 10°C or lower.
This is the same type of resin film as the plastic film made of microporous membrane exemplified in .

The plastic laminated film (C) consists of the above (A) and (B).
) are laminated together by heat sealing at a temperature of about 120 to 200°C and have a Gurley air permeability of 1 to 10,000 seconds/100.

In (C), (B) functions as an adhesive layer, but also functions as a sealing layer during bag making, as well as reinforcing the packaging material and adjusting air permeability. Sealing methods include heat sealing, adhesive sealing, and the like.

The adhesive strength of the packaging material (C) during bag making varies depending on the type of resin (B), the thickness of the film, heat sealing conditions, etc. In particular, if the film is extremely thin, the adhesive strength will be insufficient and it will not be usable. On the other hand, if it is too thick or the basis weight is too large, hot peeling may occur in the adhesive layer during heat sealing, and the air permeability will become unstable, making it difficult to ensure air permeability. It becomes stiff and lacks flexibility, making it difficult to use.

The air permeability of the packaging material is determined by the types of (Δ) and (B) used, including adhesive strength as a packaging material, ease of bag making, ease of use of the oxygen absorber packaging material, and whether the package is sealed or not. This is determined by considering various factors such as ensuring that the oxygen absorber does not spill.

In particular, if the thickness of (B) is less than 10 μm, the adhesive strength will be poor, while if it is more than 300 μm, not only will the air permeability become unstable, but the packaging material will also become stiff, lacking in flexibility and difficult to use. It is unsuitable as a packaging material for an oxygen absorber in the present invention.

The oxygen absorber package of the present invention uses the above packaging material (C) in whole or in part, and packages and seals the oxygen absorber with the above (A) on the outside.

However, the scope of the present invention is not limited in any way by the following examples.

(1) Laminated plastic film (C) (a)
Sample C-1 Tyvek 105 as a film with micropores (A)
9B (manufactured by DuPont, polyethylene nonwoven fabric) and Bolam (manufactured by Tokuyama Soda ■, PE microporous membrane) with a thickness of 35 μm as the microporous membrane (B) were laminated at a temperature of 100 to 12D°C to obtain a laminated film: sample. C-1 was prepared.

As these oxygen absorbers, those containing sulfite, hydrogen sulfite, dithionite, hydroquinone, catechol, resorcinol, pyrogallol, gallic acid, metal powder such as iron powder, ascorbic acid, etc. are used.

〔Example〕

The present invention will be explained in more detail with reference to Examples and Comparative Examples.

(b) Sample C-2 In the preparation of sample C-t, the 35 μm thick borum (described above) used as the microporous membrane (B) was
A laminated film: Sample C-2 was prepared by laminating in exactly the same manner as Sample C-1, except that the film was replaced with .mu.m Boram (manufactured by Tokuyama Soda ■, PE microporous membrane).

(C) Samples C-3 to C-5 Tyvek 1059B (described above) used as the film (A) having micropores in the preparation of sample C-1.
Luxar H1040 (manufactured by Asahi Kabo Industries ■, polyethylene nonwoven fabric), 140 μm thick NF sheet S-140 (manufactured by Tokuyama Soda ■, PP microporous membrane), and WOP paper (40 g/m
Laminated films; Samples C-3 to C-5 were prepared by laminating in exactly the same manner as Sample IC-1 except that Sample IC-1 was replaced with Sample IC-1.

(d) Sample C-6 All of the sample C-t! III! Tyvek 105 used as the film (A) with micropores in
The samples were the same except that 9B (previously) was replaced with Luxor 81040 (previously) and the 35 μm thick bolam (previously) used as the microporous membrane (B) was replaced with a 120 μm thick NF sheet (previously). A laminated film: Sample C-6 was prepared by laminating in exactly the same manner as C-1.

(e) Comparative sample C [Knee 1 to [: C-4 WOP paper (previously), perforated low density polyethylene (B holes), 90%
It was thermally laminated at ~100°C to obtain a comparative sample CC-1.

In addition, the porous low-density polyethylene (B
Comparative sample CC-2 was heat-laminated by replacing the hole) with perforated low-density polyethylene (D hole), and replacing the WO2 paper with Tyvek 1059B (mentioned above) and NF sheet S-140 (mentioned above). , comparative samples CC-3 and CC-4 were prepared.

(2) Packaging material test The air permeability, adhesive strength, heat seal strength, bag formability, workability, and durability were measured for each sample prepared in the above item (1) and a comparative sample.

The measurement results are shown in Table 1.

(3) Oxygen absorber package using each sample and comparative sample prepared in the above item (1),
Film with micropores (A) side facing outward 5QX5
A bag was made into a 0 m-thick packaging material, and an oxygen absorber composition containing iron powder as a main ingredient and having an oxygen absorption capacity of 500 itg was filled to obtain an oxygen absorber package.

These oxygen scavenger packages and 500 ml of air were placed in a bag made of oxygen barrier packaging material (KON/PE) and sealed.
The time for the oxygen concentration to reach zero after being left at 5°C was measured.

The number of samples was determined at the IO point on each side.

The measurement results are shown in Table 1.

〔Effect of the invention〕

Conventional oxygen scavenger packages using microporous membranes or nonwoven fabrics generally use packaging materials in which a microporous membrane or nonwoven fabric is laminated with a perforated low-melting-point sealant film. In these cases, it is difficult to set the laminating processing conditions for the packaging material, which is not only expensive, but also makes it impossible to freely adjust the air permeability.

On the other hand, in the present invention, since (B) of the laminate film made by pasting (A) and (B) together by heat sealing is used as an adhesive layer, it is not only easy to set the manufacturing conditions of the packaging material, but also Its air permeability can be adjusted freely.

Furthermore, the laminate film thus formed functions not only to reinforce the packaging material and adjust air permeability, but also as a sealing layer during bag making.

In particular, when laminating a porous, low-melting point sealant film, it is difficult to adjust the air permeability, but with the microporous membrane (B) of the present invention, the micropores are uniformly distributed over the entire surface of the film, so it is difficult to adjust the air permeability. Since the fine pores are maintained even after sealing, sufficient air permeability is maintained.

Furthermore, in the present invention, a nonwoven fabric, a microporous membrane, or
By using packaging materials made of water- and oil-resistant treated paper, the characteristics of non-woven fabric, microporous membranes, or water- and oil-resistant treated paper can be utilized as is, and (B) can also serve as an adhesive layer and reinforcing material for the packaging material. Therefore, the adhesive strength, bag-forming properties, and ease of use due to the flexibility of the film can be controlled by adjusting the thickness of the film.

As a result, nonwoven fabrics, microporous membranes, or water- and oil-resistant treated papers can be given stable air permeability without significantly reducing their original air permeability, making it possible to package oxygen absorbers. The body can exhibit stable oxygen scavenging performance, and at the same time, an oxygen scavenger package can be obtained that has suitable bag-forming properties and sufficient adhesive strength.

The present invention provides an oxygen scavenger package that has stable oxygen scavenging performance and is excellent in water resistance, oil resistance, and alcohol resistance, and has industrial significance including the food preservation field. is extremely large.

Figure 1

[Brief explanation of drawings]

FIG. 1: A cross-sectional view of an embodiment of the packaging material used in the present invention, in which a microporous membrane is laminated on a nonwoven fabric, a microporous membrane, or a water- and oil-resistant treated paper. FIG. 2 is a sectional view of an embodiment of the oxygen absorber package of the present invention, in which the same packaging material is filled with an oxygen absorber, packaged, and sealed. Figure 2

Claims (1)

[Claims] (1) A film (A) with one type of microporous selected from the group consisting of a nonwoven fabric that does not pass water under normal pressure, a microporous plastic film, and a water- and oil-resistant treated paper;
) and a microporous membrane (B) with a Gurley air permeability of 0.1 to 1,000 seconds/100 ml made of a resin having a softening point equal to or lower than the Gurley air permeability of 1 to 1.
A packaging material made of a plastic laminated film (C) with a speed of 0,000 seconds/100ml is used as all or part of the packaging material for the oxygen absorber, and the oxygen absorber is packaged with (A) of the packaging material on the outside. A package for an oxygen absorber characterized by being sealed.