JPH0212828B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a food/beverage product package that is internally deoxygenated so that the food/drink product contained therein is protected from the effects of oxygen.

In recent years, oxygen absorbers have come to be used to maintain the freshness of foods. This oxygen scavenger reacts with oxygen in the air and fixes it, and by placing it in a container with food and sealing it, it maintains the inside of the container in an oxygen-free state. Foods kept in such an anoxic environment are then protected from the adverse effects of oxygen.

The present invention provides a food and beverage packaging body with a novel structure that utilizes such an oxygen scavenger.

That is, according to the present invention, a non-breathable film and a breathable film are stacked with an oxygen scavenger interposed therebetween, and the peripheral edge of the breathable film is bonded and fixed to the non-breathable film. A food and beverage package with internal deoxygenation, which is obtained by stacking a lid with a double film structure on the circumference of the open end of an airtight container containing food and drink, with the breathable film facing downward, and bonding the lid with heat. is provided.

To explain the present invention with reference to the drawings, FIG. 1 is a cross-sectional explanatory view of the packaged food and drink container of the present invention, in which A is the lid, B is the container, and F is the food contained therein.

The lid body A used in the present invention has a breathable film A-2 on at least a part of the lower surface of the non-breathable base film A-1, and an oxygen scavenger between the films A-1 and A-2. Overlap with film C interposed, film A-
1 and has a double film structure.

Figures 2a and 2b show a lid sheet A used in the present invention.
is an explanatory diagram showing the cross-sectional structure of , in which A-1 is a non-breathable base film, A-2 is a breathable film, and C is the base film A-1.
This is an oxygen absorber sealed between the air-permeable film A-2 and the air-permeable film A-2. The X portion is an adhesive portion that is adhered to the periphery of the opening of the food/drink container.

FIG. 1a shows that the breathable film A-2 has the same dimensions as the non-breathable film A-1, and the films A-1 and A-2 are bonded together at their peripheral edges;
Fig. 2b shows an example in which the entire lower surface of the film A-1 has a double film structure.
In this example, the dimensions of film A-2 are smaller than film A-1, the peripheral edge of film A-2 is glued to the middle part of film A-1, and the lower part of film A-1 has a double film structure. show.

As the non-breathable base film A-1, plastic films such as various thermoplastic resin films such as polyester, nylon, polypropylene, and polyethylene are used, and these films are subjected to oxygen blocking treatment (polyvinylidene chloride treatment). In addition to metal films such as aluminum foil, and laminates of aluminum foil and heat-fusible plastic films such as polyethylene, etc., can be used. This film blocks oxygen permeation from the outside air into the container.

Examples of the breathable film A-2 include a plastic film made of polyethylene or the like with pores (so-called perforated plastic film), a perforated plastic film laminated with paper, etc., and particularly preferably two perforated plastic films. There are plastic films laminated and bonded through paper, and in this case, the paper is water-resistant and/or oil-resistant paper (for example, paraffin paper, astringent paper, oil paper, asphalt paper, pure white paper, etc.).
By using parchment paper, pseudo-parchment paper, etc.), it is possible to block the liquid permeability and obtain a film that only has air permeability. FIG. 3 shows the cross-sectional structure of this film. In FIG. 3, 1 and 2 are perforated plastic films, 3 is water- and/or oil-proof paper, and 4 and 5 are pores. Pore size is diameter
The pore size is about 0.01 mm to 2 mm, preferably about 0.05 mm to 1 mm, and the number of pores is about 1 to 100 per cm ² .
Although such a laminated film has its liquid permeability blocked, it has sufficient air permeability. This air permeability is controlled by the size and number of pores, that is, the pore area ratio.

P=S×m/A×100 (%) P: Pore area ratio A: Film surface area S: Pore area m: Number of pores present on the film surface In such a film, its air permeability is In order to be more restrictive than paper, the pore area ratio P of at least one of films 1 and 2 is preferably 5% or less, usually 0.1 to 2%.

In addition, breathable films such as ordinary paper, perforated plastic film, or a laminate of perforated plastic film and paper are films whose surfaces are treated to be water-repellent or oil-repellent to suppress liquid permeability. can do.

Examples of the oxygen scavenger C in the present invention include metal powders such as iron powder and copper powder, inorganic compounds such as hydrosulfite, bisulfite, and ferrous compounds, and organic compounds such as pyrogallol. The substances are applied alone or in the form of mixtures with other auxiliaries. A preferred oxygen scavenger is iron powder. These oxygen scavengers are fine particles with a particle size of 0.5 mm or less, usually 150 μm or less, and easily react with oxygen in the air due to the catalytic action of water vapor permeating from the outside or moisture added in advance.

When such an oxygen absorber is enclosed in the space of the double film of the lid A, the oxygen absorber can be directly enclosed in the form of granules or powder, but
It can be sealed in advance in a breathable bag made of paper or porous plastic film, and then sealed in this bag form.

In order to form the food/beverage product packaging body of the present invention, as shown in FIG. Place the lid A on top of the non-breathable film A.
-1 is placed on top, and the heat-sealed portion X of the periphery of the lid A and the circumferential surface Y of the open end of the container are bonded together by thermocompression. The container with the lid A bonded to the opening in this way is completely sealed, and the lid A
Due to the oxygen scavenging action of the oxygen scavenger C present in the
Oxygen in the container is reacted and immobilized by this, and the inside of the container is maintained in a substantially anoxic state (oxygen concentration of 1% or less). That is, the oxygen in the container diffuses through the breathable film A-2, comes into contact with the oxygen absorber C, and is removed by the oxygen absorber.

The container B used in the present invention may be of various shapes such as a tray, a cup, or a bottle as long as the peripheral surface of its opening end can be heat-sealed. Also, what to put in the container:
In addition to solid or pasty foods, liquid beverages may be used, and the type thereof is not limited.

Next, the present invention will be explained in more detail with reference to Examples.

Example A nylon film was used as the non-breathable base film A-1, and as the breathable film A-2,
Two perforated polyethylene films were laminated and adhered with parchment paper interposed between them.

Layer the breathable film A-2 on the base film A-1, heat-seal the three sides to make a bag with one end open, and put oxygen scavenger particles (iron powder treated with dilute hydrochloric acid) into the bag. Thereafter, the opening was heat-sealed to produce lid body A.

Next, prepare a sealing tray whose inner surface has been treated with oxygen barrier processing (polyvinylidene chloride processing), store the cut rice cakes in it, and then place the lid body A obtained above with the base film A-1 on top. It was placed on the periphery of the opening end of the sealing tray, and the periphery was heat-sealed to seal it.
After this product was left for 2 days, the oxygen concentration inside it was measured and found to be 1% or less.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional explanatory diagram of the food and beverage packaging body of the present invention;
2a to 2b are cross-sectional explanatory diagrams of the lid body A, FIG. 3 is a cross-sectional explanatory diagram of an example of non-breathable film A-2, and FIG. 4 is an explanatory diagram for producing a food and beverage package. . A...Lid, A-1...Non-breathable base film, A-2...Breathable film, B...Container, C
... Oxygen absorber, F ... Food and drink, 1, 2 ... Perforated plastic film, 3 ... Water and/or oil resistant paper, 4, 5 ... Pore.

Claims (1)

[Claims] 1. A non-breathable film and a breathable film are stacked with an oxygen scavenger interposed between them, and the peripheral edge of the breathable film is bonded and fixed to the non-breathable film. A food/beverage packaging body with internal deoxygenation, which is obtained by stacking a lid having a double film structure on the circumferential surface of an open end of an airtight container containing food/beverage products, with the air-permeable film facing downward, and bonding them under heat. 2. The package according to claim 1, wherein the breathable film is liquid-impermeable.