JPH10146925A - Deoxidizer-containing sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flexible deoxidizer-containing sheet, in which a water content passable water vapour permeable layer is employed so as to carry deoxidizers therebetween. SOLUTION: This sheet consists of a sheet 11, at least one side of which has a water vapour permeability. In the gap parts 14 of a laminated structure 13, between layers of which gap parts 14 are provided, deoxidizers 21 blended with a polyolefin-based resin are housed. As a result, even when the sheet is torn by being mistaken for sauce, fish flour or the like, no scattering of the deoxidizers occurs, resulting in developing no pollution and setting problems such as the eating by mistake, and pollution, which are latent ones possessed by an existing small bag containing deoxidizers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-like oxygen absorber for preventing spoilage, deterioration and deterioration of food.

[0002]

2. Description of the Related Art In recent years, spoilage and deterioration of foods, especially processed foods,
Oxygen scavengers are effectively used for the purpose of preventing deterioration. The currently available oxygen absorber is a powdery oxygen absorber stored in a gas-permeable pouch. However, since this oxygen absorber is stored in a bag, it is easily mistaken for a food package, and there is a risk of accidental eating such as eating a small bag. When it is stored in a bag or the like, irregularities may occur, causing a problem in terms of the aesthetic appearance of the product, or giving a sense of incongruity when mixed with the product.

[0003] In order to solve such problems, proposals for forming a sheet of oxygen scavenger are disclosed in, for example, JP-A-2-86758, JP-A-7-219430, and JP-A-8-99.
No. 013 and the like. However, these proposed sheeting methods involve kneading the oxygen scavenger with a plastic resin or sandwiching it between plastic films.
This is a simple fixation and support, and does not take into account the incorporation of moisture that serves as a trigger (catalyst) for oxygen absorption. Some porous materials take this point into consideration, but because they are brittle, it is necessary to store them in a known deoxygenated packaging material, such as a perforated laminate film, and it can be called a flexible film or sheet. There is no present. In addition, depending on the type of the oxygen scavenger, the oxygen scavenger may be liquefied after the reaction, and the liquid may leak. This can lead to contamination of the stored food,
Not a good thing.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems relating to the sheet-shaped oxygen absorber, and uses a moisture-permeable layer that can sufficiently pass water as a trigger. It is another object of the present invention to provide a flexible sheet containing an oxygen absorbing agent by supporting an oxygen absorbing agent between the layers.

[0005]

Means for Solving the Problems A first invention of the present invention is:
At least one surface is made of a sheet having moisture permeability, and, in the voids of the laminate structure in which voids are provided between the layers, the oxygen absorber blended with the polyolefin resin is stored. It is a sheet containing a deoxidizer.

According to a second aspect of the present invention, there is provided the oxygen-containing sheet according to the first aspect, wherein the moisture-permeable sheet is a polyester elastomer.

Further, a third invention provides the oxygen-absorbing sheet according to the first invention, wherein the moisture-permeable sheet is a laminate of a polyester elastomer and a nonwoven fabric or a porous film. is there.

[0008] Further, a fourth invention is directed to the first, second, and third inventions.
In the third invention, the moisture-permeable sheet has a moisture permeability of 500 to 3000 g / m ² · 24 hrs. The oxygen-absorbing sheet according to claim 1, 2 or 3, wherein:

Further, the fifth invention is characterized by the first to fourth aspects.
In the invention, the polyolefin resin blended with the oxygen scavenger is a low-density polyethylene resin (LDP).
E), ethylene-vinyl acetate copolymer resin (EV
A), ethylene-butene-1 copolymer resin (EBC-
1), ethylene-propylene-1 copolymer resin (EPC
-1), wherein:
A sheet containing an oxygen scavenger according to 2, 3, or 4.

[0010] As described above, according to the present invention, at least one side of a laminated structure which is formed of a sheet having moisture permeability and has a gap between layers,
Since the oxygen absorber blended with the polyolefin-based resin is stored, moisture is sufficiently taken in and the oxygen absorbing effect is high, and the oxygen absorber does not spill out of the laminate structure.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to examples. FIG. 1 is a cross-sectional view showing one embodiment of the oxygen-containing sheet of the present invention.

The oxygen-absorbing sheet 1 according to the present invention comprises a laminated structure 13 having voids 14 between the layers. The laminated structure has a moisture-permeable sheet 11 on one side and a base sheet on the other side. In the void portion, an oxygen absorber 21 blended with a polyolefin resin is accommodated and formed.

The moisture permeable sheet 11 constituting the laminate structure 13 has a moisture permeability of 500 to 3000 g / m ² because it takes in moisture that triggers a deoxygenation reaction.
・ 24 hrs. The polyester elastomer of the above can be preferably used. Here, the polyester elastomer is
A polyester-polyether type block copolymer having a polyester hard segment of an aromatic dicarboxylic acid and an aliphatic glycol and a soft segment of poly (alkylene oxide) glycol.

The moisture permeable sheet 11 may be a laminate of the polyester elastomer and a nonwoven fabric or a porous film. Also in this case, the moisture permeability is 500 to 3
000 g / m ² · 24 hrs. Must.

The base sheet 12 constituting the laminated structure 13 together with the moisture permeable sheet 11 may be a thermoplastic resin sheet that can be bonded to the moisture permeable sheet 11, and is a sheet of the same material as the moisture permeable sheet. Is also good. A sheet in which the concave portion is formed by the forming method such as the vacuum forming method and the gap portion 14 can be formed may be used. Further, the shape of the void portion 14 may be any shape such as a circle, a square, a rectangle, and a triangle.

The laminate of the moisture permeable sheet 11 and the base sheet 12 may be bonded using an adhesive or may be thermocompression bonded. When an adhesive is used, any known adhesive can be used. For example, a well-known adhesive for dry lamination (for example, one-component or two-component adhesive of polyester, polyurethane, polyimine, or polyester polyurethane) can be used. Agents) and an anchor coating agent (for example, a one- or two-liquid anchor coating agent of a urethane type, a polyurethane type, a polyimine type, or a polyester polyurethane type).

As the oxygen scavenger 21 to be stored in the cavity 14, for example, a well-known nonferrous oxygen scavenger such as iron or ascorbic acid can be used. The polyolefin resin blended with the oxygen scavenger is powdered LDPE, EVA, EBC-1
Since EPC-1 and EPC-1 have a relatively low melting point, they can be preferably used because they partially melt to form a porous form. The blend ratio between the oxygen scavenger and the polyolefin resin is determined by the amount of oxygen scavenging required per sheet area.

[0018]

EXAMPLES Examples of the present invention will be described below more specifically. Using vinylon sheet having a thickness of 100μm <Example 1> substrate sheet 12, and drawing, diameter 20 mm, a circular recess having a depth of 2mm (the gap portion 14) is formed 1500 per sheet 1 m ^2. Next, a 1: 1 (weight ratio) blend of a gallic acid-based oxygen scavenger and EBC-1 resin powder was stored in the cavity 14. 13 μm thick, which is the moisture permeable sheet 11 so as to cover the voids of the base sheet
, And heat-sealed, followed by cutting as appropriate to obtain a sheet 1 containing an oxygen scavenger of the present invention having a length of 10 cm and a width of 10 cm (see FIG. 1).
One sheet contains 1.5 g of a deoxidizer.

Example 2 A 20 μm-thick polyester elastomer film was used as a base sheet 12, on which a gallic acid-based oxygen absorber and EBC-1 resin powder were blended at a ratio of 1: 1 (weight ratio). 0.4 g each was placed in a frame of 30 mm long and 40 mm wide provided at intervals of 20 mm. Next, a moisture permeable sheet 11 having a thickness of 20
μm polyester elastomer film and thermocompression bonded to form a laminate structure 13 which is further cut and
The oxygen-containing sheet 2 of the present invention having a size of 0 cm and a width of 12 cm was obtained. (See FIG. 2). (One sheet contains four frames of 30 mm long and 40 mm wide containing an oxygen scavenger). One sheet contains 0.8 g of an oxygen scavenger.

<Comparative Example 1> As a comparative example, polyester (thickness: 12 μm) currently being distributed / thin paper (basis weight: 180)
g / m ² ) / polyethylene (thickness: 20 μm) machine-perforated pouches with oxygen absorbers with dimensions of 3 cm × 4 cm were prepared (about 100 holes / m ² with small holes of 0.01 mm diameter). Hole). The oxygen scavenger is a gallic acid-based oxygen scavenger and 1.5 g / bag is enclosed as an oxygen scavenger.

The oxygen-absorbing ability and the state of liquid leakage on the sheet surface of the two kinds of oxygen-containing sheets and the one type of oxygen-containing bag thus prepared were measured under the following conditions.
Observed. Table 1 shows the results. Deoxidizing capacity: The above-mentioned sheet containing the oxygen-absorbing agent or the sachet containing the oxygen-absorbing agent is subjected to 25 ° C, 93% RH Housed in a glass container filled with 250 cc of air under the atmosphere of
After sealing, and after 1 day, 3 days, and 7 days, the oxygen concentration in the glass container was measured with an oxygen concentration meter RO-102 (manufactured by Iijima Electronics Co., Ltd.), and the sheet or pouch was deoxygenated. State of liquid leakage: The state of liquid leakage on the surface of each sample 7 days after the measurement of the deoxygenation capacity was visually observed.

[0022]

[Table 1]

Considering from Table 1, the oxygen-containing sheet of the present invention has an oxygen concentration of 0.00% after 3 days.
It can be seen that it shows a deoxidizing ability comparable to that of the current sachet containing oxygen scavenger. Further, even after 7 days, there was no liquid leakage on the sheet surface, indicating that there was no problem as a product (Example 1,
2).

[0024]

As described above, according to the present invention, a flexible sheet containing an oxygen absorber having the same oxygen absorption capacity as that of an existing oxygen absorber can be produced. In addition, since the oxygen scavenger does not scatter even if the bag is mistakenly opened as a sauce or sprinkle, it does not contaminate, and the problem of accidental eating and contamination that the existing oxygen scavenger-containing pouch potentially has Could be solved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a cross section showing one embodiment of a sheet containing an oxygen scavenger of the present invention.

FIG. 2 is an explanatory diagram showing a cross section showing another embodiment of the sheet containing an oxygen scavenger of the present invention.

[Explanation of symbols]

 1, 2} Sheet with oxygen scavenger 11} Moisture permeable sheet 12} Base sheet 13} Laminated structure 14} Void 21} Oxygen scavenger

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B32B 27/12 B32B 27/12 27/32 27/32 Z 27/36 27/36

Claims (5)

[Claims] An oxygen absorber blended with a polyolefin-based resin is stored in said void portion of a laminate structure having at least one surface made of a sheet having moisture permeability and having a void portion between layers. An oxygen-absorbing sheet. 2. The oxygen-containing sheet according to claim 1, wherein the moisture-permeable sheet is a polyester elastomer. 3. The sheet containing an oxygen scavenger according to claim 1, wherein the sheet having moisture permeability is a laminate of a polyester elastomer and a nonwoven fabric or a porous film. 4. The moisture-permeable sheet having a moisture permeability of 5
00~3000g / m ² · 24hrs. The oxygen-containing sheet according to claim 1, 2 or 3, wherein: 5. The polyolefin resin blended with the oxygen scavenger is a low-density polyethylene resin, an ethylene-vinyl acetate copolymer resin, an ethylene-butene-1 copolymer resin, or an ethylene-propylene-1 copolymer. 5. The resin according to claim 1, wherein the resin is one of resins.
The sheet containing the oxygen scavenger according to the above.