JPS6254704B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an oxygen absorber package using a microporous membrane or a nonwoven fabric as a part of the structure.

[Conventional technology]

In recent years, oxygen absorbers have come to be used for preserving foods and the like, and along with this, the development of packaging materials for oxygen absorber packages has also been studied. However, as a packaging material for an oxygen absorber package especially applied to humid foods, no packaging material that is sufficiently satisfactory in terms of water resistance, air permeability, etc. has yet to be developed.

The requirements for oxygen scavenger packaging to be applied to humid foods are: 1. The packaging material must have extremely good gas permeability; 2. The surface of the packaging material should not stain even if it comes into contact with humid foods. Food stains should not transfer to the packaging material and impair the appearance of the oxygen absorber package, or seep into the inside of the oxygen absorber composition and reduce its functionality) 3. High-speed filling packaging during the production of oxygen absorber packages Examples include being able to.

Incidentally, recently, the development of microporous membranes and nonwoven fabrics processed from polyolefin resins has been actively progressing. These materials have high air permeability like paper and good water resistance, so they are expected to be used as packaging materials for oxygen absorber packages, especially for high-humidity foods. be done.

However, these are made of polyethylene,
Because it is a single polyolefin such as polypropylene, if you use a normal packaging machine that heats and presses the membrane or nonwoven fabric from the outside, the microporous membrane or nonwoven fabric will fuse to the heat bar or heat roll, so heat sealing is not necessary. was not possible and required the use of a special sealer, such as an impulse sealer.

Moreover, when such a special sealer is used, it is impossible to perform high-speed filling and packaging as in the past, resulting in a significant drop in efficiency.

A package in which an oxygen absorber package is packaged using a non-woven fabric may be one using a composite packaging material having at least two layers: a non-woven fabric layer and a layer that is permeable to oxygen and impermeable to water. in this case,
Because the nonwoven fabric is laminated or coated with a thermoplastic synthetic resin layer, the inherent gas permeability of the nonwoven fabric is reduced, and when used as an oxygen scavenger package, it has the drawback of inhibiting effective oxygen scavenging rate performance. It was hot.

[Problem that the invention seeks to solve]

The purpose of the present invention is to overcome the drawbacks of the conventional oxygen scavenger packaging described above, to take full advantage of the excellent air permeability and water resistance inherent in microporous membranes and water-resistant nonwoven fabrics, and to utilize conventionally used machines. An object of the present invention is to provide an oxygen absorber package that enables high-speed filling of an oxygen absorber even when used as is.

[Means for solving problems]

The oxygen absorber package of the present invention is constructed by combining the conditions of the packaging material used and the specified lamination conditions.

That is, the present invention provides an oxygen absorber package consisting of an upper layer A, an inner layer B, a lower layer C, and an oxygen absorber D, wherein the upper layer A has micropores and has a Gurley air permeability.
A microporous membrane made of a plastic sheet that is 0.01 to 10,000sec/100ml and impermeable to water at normal pressure, or a membrane with micropores and a Gurley air permeability of 0.01 to 10000sec/100ml.
10,000sec/100ml and is made of a non-woven fabric made of a plastic sheet that does not allow water to pass through under normal pressure. The lower layer C is a sheet made of a plastic having a softening point higher than that of the plastic constituting the inner layer B, and has micropores and has a Gurley air permeability. A microporous membrane made of a plastic sheet that is 0.01 to 10,000 sec/100 ml and impermeable to water under normal pressure, or a sheet made of a plastic having a softening point higher than that of the plastic constituting the inner layer B. It is made of a nonwoven fabric made of a plastic sheet that has micropores and a Gurley air permeability of 0.01 to 10,000 sec/100 ml and does not allow water to pass through at normal pressure.Inner layer B is arranged between upper layer A and lower layer C. Provided is an oxygen absorber package, characterized in that the oxygen absorber D is arranged between the upper layer A and the inner layer B or between the inner layer B and the lower layer C, and the four sides are heat-sealed. It is.

The oxygen absorber package of the present invention includes an upper layer A, an inner layer B,
It consists of a lower layer C and an oxygen scavenger D.

In the present invention, as the plastic sheet forming the upper layer A, a microporous membrane or a nonwoven fabric is used.

In the present invention, when a microporous membrane (usually called a microporous film) is used as the plastic sheet of the upper layer A, the microporous membrane has micropores and has a Gurley air permeability of 0.01.
~10000sec/100ml, preferably 1~1000sec/
It is 100ml and is made of a plastic sheet that does not allow water to pass through at normal pressure. The Gurley air permeability (unit: sec/100ml) is JIS P8117.
The gas permeability of the film is measured by
Microporous membrane has micropores of 0.01 to 50μ, maximum pore diameter of 2μ
The following are preferred.

In order to produce the microporous membrane that can be used in the present invention, cold stretching of a synthetic resin film such as polyethylene, polypropylene, polyfluorinated ethylene resin, etc., stretching of a film containing foreign matter, and stretching of a film containing foreign matter are carried out. Methods include extracting foreign matter from a film, extracting foreign matter from a film containing foreign matter and then stretching the film, or irradiating the film with an electron beam.

Commercially available microporous membranes suitable for use in the present invention include, for example, Zyuragard (manufactured by Celanese, USA), FP-2 (manufactured by Asahi Kasei Corporation),
(manufactured by Japan Petrochemical Co., Ltd.), NOP (manufactured by Japan Petrochemical Co., Ltd.), Nitoflon
NTF (manufactured by Nitto Electric Industry Co., Ltd.), NF sheet (manufactured by Tokuyama Soda Co., Ltd.), Selpore NW01 (manufactured by Sekisui Chemical Co., Ltd.),
Examples include Polyflon paper (manufactured by Daikin Industries, Ltd.).

In the present invention, when a nonwoven fabric is used as the plastic sheet forming the upper layer A, the nonwoven fabric has a Gurley air permeability of 0.01 to 10,000 sec/100ml, preferably 1 to 1000 sec/100 ml.
It is 1000sec/100ml and does not allow water to pass through at normal pressure. Further, the maximum pore diameter of the open pores of the nonwoven fabric that can be used in the present invention is preferably 2 μ or less.

Nonwoven fabrics that can be used in the present invention include:
For example, various types of plastic fibers such as polyethylene, polypropylene, polyfluorinated ethylene, polyester, or nylon bonded together using heat, pressure, adhesives, etc. can be used. Preferably, fibers are bonded together.

Commercially available nonwoven fabrics suitable for use in the present invention include, for example, Tyvek (USA,
(manufactured by DuPont), IL, Spunpond (manufactured by Asahi Kasei Industries, Ltd.), Axter (manufactured by Toray Industries, Inc.), and the like.

In the present invention, the inner layer B is made of a film made of plastic having a softening point lower than that of the plastic constituting the upper layer A and having holes formed therein.

The plastic material constituting this film includes, for example, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, polyethylene ionomer, etc., and is selected depending on the material of the upper layer A. That is, it is selected in accordance with the softening point of the plastic constituting the upper layer A.
The following is an example of appropriately selecting the material of the film with holes corresponding to the material of A.

For example, if a microporous membrane is used as the upper layer A and the microporous membrane is made of polyethylene, the material of the film with holes made of ethylene vinyl acetate copolymer or polyethylene ionomer may be used for the microporous membrane. When the microporous membrane is made of polypropylene, the film with holes is made of polyethylene, ethylene vinyl acetate copolymer, or polyethylene ionomer, etc. When the microporous membrane is made of polyfluorinated ethylene, the film with holes is made of The material is polyethylene,
Polypropylene, ethylene vinyl acetate copolymer, polyethylene ionomer, or the like is used. In addition, a nonwoven fabric is used as the upper layer A,
When the nonwoven fabric is made of polyethylene, the material for the film with holes is ethylene vinyl acetate copolymer or polyethylene ionomer, and when the nonwoven fabric is made of polypropylene, the material for the film with holes is ethylene vinyl acetate copolymer or polyethylene ionomer. is made of polyethylene, ethylene-vinyl acetate copolymer, polyethylene ionomer, etc. In addition, when the nonwoven fabric is made of polyfluorinated ethylene, polyester, nylon, etc., the material of the perforated film is polyethylene,
Polypropylene, ethylene vinyl acetate copolymer, polyethylene ionomer, or the like is used.

In the present invention, the lower layer C is made of the same plastic sheet as the upper layer A. That is, as the plastic sheet of the lower layer C in the present invention, a microporous membrane or a nonwoven fabric is used. Therefore, in the present invention, the lower layer C has fine pores and has a Gurley air permeability of 0.01 to 10000 sec/100ml.
A microporous membrane made of a plastic sheet that does not allow water to pass through under normal pressure, or a plastic sheet that has micropores and has a Gurley air permeability of 0.01 to 10,000 sec/100 ml and does not allow water to pass through under normal pressure. A nonwoven fabric is used.

In the present invention, the material of the sheet used as the lower layer C is the same as that used for the upper layer A, but is selected in accordance with the material of the inner layer B. That is, the material of the lower layer C is selected so that the softening point of the plastic forming the lower layer C is higher than the softening point of the plastic forming the inner layer B. In the oxygen absorber package of the present invention, the lower layer C
The material of the upper layer A may be the same as that of the upper layer A, or may be different.

In the present invention, each of the upper layer A, inner layer B, and lower layer C constitutes an oxygen absorber package as follows.

That is, the inner layer B is placed between the upper layer A and the lower layer C, the oxygen absorber D is placed between the upper layer A and the inner layer B, and the oxygen absorber is packaged by heat sealing on all sides. Alternatively, an inner layer B is placed between the upper layer A and the lower layer C, and an oxygen scavenger D is placed between the inner layer B and the lower layer C.
The oxygen absorber package can be constructed by arranging and heat-sealing the four sides to package the oxygen absorber.

As a method for manufacturing the oxygen absorber package of the present invention, for example, after laminating the upper layer A and the inner layer B in advance, the laminated sheet and the lower layer C are laminated together.
A method of forming an oxygen absorber package by placing an oxygen absorber between the inner layer B and heat-sealing the periphery;
A method is adopted in which after laminating the laminate sheet and the lower layer C in advance, an oxygen absorber is placed between the laminate sheet and the upper layer A, and the periphery is heat-sealed to form an oxygen absorber package. Also, prepare three layers: upper layer A, inner layer B, and lower layer C, and arrange inner layer B between upper layer A and lower layer C, and between upper layer A and inner layer B or between inner layer B and lower layer C. It is also possible to use a method in which an oxygen absorber is provided, and the oxygen absorber is filled inside at the same time as packaging, and the package is heat-sealed to form an oxygen absorber package.

In the present invention, the upper layer A and the lower layer C are preferably embossed so that the rate of oxygen removal is not inhibited when the oxygen absorber package is sealed with food or the like.

The oxygen scavenger is a composition capable of absorbing oxygen, and any known per se can be used.

[Effect]

In the present invention, in order to fully utilize the excellent air permeability and water resistance of microporous membranes or nonwoven fabrics, we use them as a single substance, and furthermore, we use laminates with different softening points as mating materials to achieve suitable bag making. This makes it possible to exhibit high-speed filling and packaging characteristics, as well as to exhibit stable sealing strength.

In addition, in the present invention, each packaging material constituting the package is selected to have an appropriate softening point, so high-speed filling is possible without the sheet welding and adhering to the heat bar or heat roll during bag manufacturing. . For example, the temperature of the heat bar or heat roll on the upper layer A side is set lower than the softening point of the plastic forming the upper layer A and higher than the softening point of the plastic forming the inner layer B, and the heat bar or heat roll on the lower layer C side By setting the temperature of the roll to be lower than the softening point of the plastic constituting the lower layer C and higher than the softening point of the plastic constituting the inner layer B, high-speed filling and packaging is possible. can be manufactured industrially.

Furthermore, since the microporous membrane or nonwoven fabric itself is a single layer, the packaging bag can take advantage of the air permeability of the microporous membrane or nonwoven fabric, and the oxygen scavenger packaging obtained by the present invention has good air permeability. It is good and can increase the deoxidation rate. Moreover,
Since each layer of the oxygen absorber package of the present invention is composed of a breathable sheet, it also has the advantage that oxygen absorption is efficiently performed.

〔Example〕

Example 1 (a) A 40μ thick EVA (ethylene vinyl acetate copolymer) film with small pores of 0.2 mm in diameter at 1 mm intervals on the left, right, top and bottom, and a 150μ thick microporous membrane (Cellpore, Sekisui Chemical Co., Ltd.) (b) polyethylene non-woven fabric with a thickness of 170μ (Tyvek, manufactured by DuPont, USA) and (b) a four-sided sealing high-speed filling machine so that the EVA side of the laminated packaging material and the non-woven fabric are in contact with each other. It was introduced in

In a four-side sealing high-speed filling machine, both packaging materials were heat-sealed using hot rolls, and a deoxidizing composition (100 parts of iron powder was mixed with 2 parts of a 20% NaCl aqueous solution and dried) at a rate of 80 shots/min. 3 g of the composition) was filled to obtain an oxygen absorber package with a length of 50 mm x width of 50 mm and a seal width of 5 mm.

The thus obtained oxygen absorber package was placed in a KOP (polyvinylidene chloride coated stretched polypropylene)/PE (polyethylene) film bag together with cotton impregnated with 10 ml of water, and 500 ml of air was sealed in the bag, and the bag was placed at 25°C. When left alone, the oxygen concentration inside the bag reached 0.024% after 10 hours.

Example 2 Between (a) a polyethylene nonwoven fabric with a thickness of 170 μm (Tyvek, manufactured by DuPont, USA) and (b) a microporous polypropylene membrane with a thickness of 50 μm (Jyuraguard, manufactured by Celanese Company, USA), (c ) A polyethylene ionomer film with small holes of 0.3 mm in diameter made at 7 mm intervals on the left, right, top, and bottom was sandwiched, and the film was stacked in the order of (a) - (c) - (b) and introduced into a four-sided seal high-speed filling machine.

In a four-side sealing high-speed filling machine, while heat-sealing both packaging materials with a hot roll, a deoxidizing composition (mixed 100 parts of iron powder with 2 parts of a 20% NaCl aqueous solution and dried) was added at a rate of 80 shots/min. 3 g of the composition) was packed between the nonwoven fabric layer and the polyethylene ionomer film layer, and the size was 50 mm long x 50 mm wide.
An oxygen absorber package with a seal width of 5 mm was obtained.

The thus obtained oxygen absorber package was placed in a KOP (polyvinylidene chloride coated stretched polypropylene)/PE (polyethylene) film bag together with cotton impregnated with 10 ml of water, and 500 ml of air was sealed in the bag, and the bag was placed at 25°C. When left alone, the oxygen concentration inside the bag reached 0.025% after 10 hours.

〔effect〕

According to the present invention, high-speed filling and packaging can be performed while taking advantage of the characteristics of the packaging material, which has excellent air permeability and water resistance, while also providing suitable bag-forming properties and stable seal strength. It is possible to manufacture oxygen agent packages. In the present invention, the microporous membrane or nonwoven fabric is not fused to the heating bar or heating roll, and the heat sealing between the microporous membrane or nonwoven fabric and the inner surface of the laminate is achieved by the low softening point layer forming the inner surface of the laminate. Since it is made in a molten state, the sealing strength is also increased.

In the oxygen absorber package of the present invention, a packaging material having excellent air permeability and water resistance is used alone on both the upper layer A and the lower layer C, so that extremely excellent gas permeation, which could not be achieved with conventional packaging materials, is achieved. In addition, it can prevent the transfer of stains from foods even if any of the outer surfaces are brought into contact with humid foods.

When the oxygen absorber package manufactured according to the present invention is applied to food preservation, even if the food is a humid or high-moisture food, the packaging bag of the oxygen absorber package has excellent water resistance. Even if the oxygen absorber package comes into direct contact with food, stains will not appear on the surface of the oxygen absorber package, and the packaging bag of the oxygen absorber package has excellent air permeability, so oxygen can be removed suitably.

The present invention provides a method for manufacturing a suitable oxygen absorber package, but it can also be used as a desiccant, an aromatic agent, and a heat generating element.

[Brief explanation of the drawing]

FIGS. 1 and 2 are cross-sectional views showing embodiments of the oxygen absorber package of the present invention. In the drawings, 1...upper layer (microporous membrane or nonwoven fabric), 2...
inner layer (a perforated film with a softening point lower than that of the plastic constituting the upper layer 1),
3... Lower layer (microporous membrane having a softening point higher than that of the plastic forming the inner layer 2, or nonwoven fabric having a softening point higher than the softening point of the plastic forming the inner layer 2), 4... Oxygen agent.

Claims (1)

[Scope of Claims] 1. An oxygen absorber package consisting of an upper layer A, an inner layer B, a lower layer C, and an oxygen absorber D, wherein the upper layer A has micropores and has a Gurley air permeability.
A microporous membrane made of a plastic sheet that is 0.01 to 10,000sec/100ml and impermeable to water at normal pressure, or a membrane with micropores and a Gurley air permeability of 0.01 to 10000sec/100ml.
10,000sec/100ml and is made of a non-woven fabric made of a plastic sheet that does not allow water to pass through under normal pressure. The lower layer C is a sheet made of a plastic having a softening point higher than that of the plastic constituting the inner layer B, and has micropores and has a Gurley air permeability. A microporous membrane made of a plastic sheet that is 0.01 to 10,000 sec/100 ml and impermeable to water under normal pressure, or a sheet made of a plastic having a softening point higher than that of the plastic constituting the inner layer B. It is made of a nonwoven fabric made of a plastic sheet that has micropores and a Gurley air permeability of 0.01 to 10,000 sec/100 ml and does not allow water to pass through at normal pressure.Inner layer B is arranged between upper layer A and lower layer C. An oxygen absorber package characterized in that an oxygen absorber D is arranged between the upper layer A and the inner layer B or between the inner layer B and the lower layer C, and the four sides are heat-sealed.