JPH06234180A - Drip absorbing sheet having antimicrobial property - Google Patents

Abstract

PURPOSE:To provide an antimicrobial drip absorbing sheet capable of absorbing drip of fresh food, etc., sterilizing or disinfecting microorganism on the surface of the food at the contact face with the food. CONSTITUTION:A film 1 containing a silver ion-containing inorganic material and having fine communicating holes 2 on the whole face and a water absorbing paper 4 are stuck together being coated with an adhesive 3 in dot pattern and lattice pattern.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drip absorbent sheet having antibacterial properties, and more particularly, it can be widely used in the field of technology for maintaining freshness of fresh foods.

[0002]

2. Description of the Related Art Conventionally, as a drip absorbing sheet for fresh food, paper, non-woven fabric, or a laminated body of these and a base sheet is used. These drip absorbing sheets prevent the deterioration of the appearance of food due to excess water, and do not consider the problem of growth of various bacteria adhering to food at all.

As a drip absorbing sheet having antibacterial properties, the present inventors have filed Japanese Patent Laid-Open Nos. 63-156540 and 1-85271. These are an inorganic antibacterial agent and a water-absorbent resin. Is wrapped in a water-permeable base material to form a sheet, and is characterized by preventing microorganisms from propagating inside the drip absorbing sheet that has absorbed the drip of food.

[0004]

DISCLOSURE OF THE INVENTION In the above-mentioned conventional techniques, the drip absorbing sheet of paper, non-woven fabric or a laminated body of them and a base sheet is intended to prevent the deterioration of the appearance due to excess moisture of food. Therefore, no consideration is given to microorganisms. In addition, a drip absorption sheet of a type in which an inorganic antibacterial agent and a water-absorbent resin are wrapped in a water-permeable base material prevents the growth of microorganisms in the drip absorption sheet, and actively protects microorganisms attached to food. There is no effective sterilization effect. Therefore, an object of the present invention is to provide a drip absorbent sheet that can suppress the growth of various bacteria on the contact surface with foods and can exert a freshness-retaining effect.

[0005]

In view of the above object, as a result of earnest research, the present inventors have found that a drip absorbing sheet is a liquid permeable antibacterial film having fine communication holes,
The present invention has been completed by discovering that the use of a laminate with water-absorbent paper can sterilize microorganisms on the contact surface, that is, the food surface, and impart a freshness-retaining effect.

That is, the antibacterial drip absorbing sheet of the invention of claim 1 is a laminated body of an antibacterial film 1 having a fine communication hole 2 and being liquid permeable and a water absorbent paper 4. Then, the antibacterial film 1 and the water-absorbent paper 4 are adhered to each other by partial adhesion 3, and silver is contained in the material forming at least the surface of the antibacterial film 1 opposite to the water-absorbent paper 4. A drip absorbing sheet having antibacterial properties, characterized by containing a silver ion-containing inorganic substance capable of gradually eluting ions.

An antibacterial drip absorbent sheet according to a second aspect of the present invention is the antibacterial drip absorbent sheet according to the first aspect, wherein the area of the adhesive portion between the antibacterial film and the water absorbent paper is the entire water absorbent paper. It is characterized by being 1% or more and less than 95% of the area.

An antibacterial drip absorbent sheet according to a third aspect of the present invention is the antibacterial drip absorbent sheet according to the first aspect, wherein the silver ion-containing inorganic material is zeolite, soluble glass, or weathered reef coral. , Layered phosphate, calcium phosphate, clay mineral, and calcium silicate.

In the antibacterial film used in the present invention, a silver ion-containing inorganic substance capable of gradually eluting silver ions is used as an antibacterial agent. Then, as the inorganic substance containing silver ions, for example, zeolite, soluble glass, weathered reef coral, layered phosphate, calcium phosphate, clay mineral, calcium silicate and the like can be used. From these inorganic substances containing silver ions, the silver ions are gradually eluted, and the eluted silver ions exert an antibacterial action against the microorganisms on the food surface.

In the present invention, such a silver ion-containing inorganic material has a particle size of 200 μm or less, preferably 50 μm.
The following fine particles are contained in the material for forming at least the surface of the antibacterial film opposite to the water-absorbent paper, that is, the surface in contact with the food. Here, if the particle size is 200 μm or more, the dispersion in the forming material becomes uneven. The content is preferably 0.05 to 15% by weight. 0.05% by weight
If the amount is less than the above range, the antibacterial effect due to silver ions becomes insufficient, and if it exceeds 15% by weight, kneading into the forming material becomes difficult, which is not preferable.

Further, as a forming material containing a silver ion-containing inorganic material, that is, as a resin for an antibacterial film, a polyolefin resin such as polypropylene or polyethylene, or a thermoplastic resin such as polyamide or polyester can be preferably used. There is no particular limitation. Regarding the kneading of the silver ion-containing soluble glass into the thermoplastic resin, a method of mixing and molding immediately before forming the film, or a method of previously kneading in the thermoplastic resin to form a masterbatch is applied. In general, the masterbatch method is preferred. The water absorbent paper is not particularly limited,
It is hygienic and does not contain optical brighteners and has a water retention capacity of 100.
It is preferably g / m ² or more.

As a method for producing the drip absorbent sheet having antibacterial properties of the present invention from the above antibacterial film and water absorbent paper, for example, a method of laminating an antibacterial film having fine communication holes and water absorbent paper, Alternatively, there is a method in which a laminate of an antibacterial film and water-absorbent paper is subjected to fine through-hole processing, and a method in which the antibacterial film is subjected to fine through-hole processing and simultaneously laminated, and any of them may be selected. .

In order to impart liquid permeability to the antibacterial film, in the case of making fine communication holes, any method such as a physical method using a heating needle or an optical method using a laser can be used. . The pore diameter and the number of openings are not particularly limited, but the pore diameter is 100 to 800 μm.
m and the number of open holes is generally in the range of 0.1 to 1000 holes / cm ² .

The laminate of the antibacterial film and the water absorbing paper can be adhered by applying an adhesive to the antibacterial film in a pattern. The application area of the adhesive is preferably 1% or more and 95% or less of the entire area. If the coating area of the adhesive is 1% or less, the adhesive strength becomes insufficient when absorbing water, which is not preferable. Further, if the adhesive application area is 95% or more, the water absorption and the water absorption rate are hindered, which is not preferable. The adhesive can be applied by, for example, a gravure roll on which various patterns are formed. As the coating pattern, for example, an arbitrary pattern such as a dot shape, a mesh shape, or a grid shape can be selected. Regarding the laminating method, in addition to this, a method of spraying an adhesive by a spray or the like, a method of thermocompression bonding using a net-like hot-melt adhesive, a method of applying a fine through-hole process to the antibacterial film to melt There is a dot-like adhesion with resin, and the area of the adhesion part is 1% or more of the total area.
Any method can be selected as long as it is 5% or less.

[0015]

As described above, the drip absorbent sheet having antibacterial properties of the present invention has fine communication holes and partially adheres the liquid permeable antibacterial film and the water-absorbent paper, and
At least the silver ion-containing inorganic substance capable of gradually eluting silver ions is contained in the material for forming the surface of the antibacterial film opposite to the surface on which the water absorbing paper is bonded. By adopting such a configuration, when a fresh food or the like is wrapped with this sheet, the water released from the food is absorbed by the water-absorbent paper through the fine communication holes of the antibacterial film, and at the contact surface with the food. Silver ions are gradually eluted from the antibacterial film, the growth of various bacteria is suppressed, and the freshness of food can be maintained.

[0016]

EXAMPLES Examples will be described in detail below. (Example 1) Soluble glass containing silver ions [Ion Pure WA1 manufactured by Ishizuka Glass Co., Ltd.] for producing an antibacterial film
1i] 20 parts by weight and polyethylene [Mitsui Petrochemical Co., Ltd.
Mirason 16P] 80 parts by weight are mixed under heating at 160 ° C., then pelletized, and the silver ion-containing soluble glass is mixed with 2 parts.
A masterbatch containing 0% by weight was prepared. Since the antibacterial film has a two-layer structure, a multilayer inflation method is adopted, and 15 parts by weight of the master batch and 85 parts by weight of linear low-density polyethylene [Ultzex 3021F] manufactured by Mitsui Petrochemical Co., Ltd. are used as the first layer. Using the mixture, the thickness was set to 10 μm, and the linear low-density polyethylene (hereinafter abbreviated as LLDPE) used in the first layer was used for the second layer, and the thickness was set to 20 μm. A 30 μm two-layer film was formed. This film has the following constitution. LLDPE containing 3% of soluble glass containing silver ions 10 μm / LLDPE
20 μm

Next, the antibacterial film has a pore size of 500 μm.
m, and the number of holes was 100 / cm ² , the holes were continuously opened from the antibacterial surface side using a heating needle. After the opening, a urethane adhesive is applied in a pattern using a gravure roll on the surface opposite to the antibacterial surface (silver ion-containing surface) (application area 20
%), And after being adhered and fixed to water-absorbent paper [Okutor 800, manufactured by Mishima Paper Co., Ltd.], cut into a size of 30 cm × 40 cm to obtain a drip absorbent sheet having antibacterial properties. The water retention capacity after dipping the antibacterial drip absorbing sheet in water for 15 minutes and then centrifuging at 800 rpm for 30 seconds with a centrifuge was 400 g / m ² .

(Comparative Example 1) Using the same linear low density polyethylene as used in Example 1, a film having a thickness of 30 μm was prepared with a single layer of LLDPE, and the opening and water absorption were conducted under the same conditions as in Example 1. Lamination processing with paper was carried out. After that, it was cut into a size of 30 cm × 40 cm to obtain a drip absorbing sheet for comparison.

(Test) The following tests were carried out using the drip absorbing sheets obtained in Example 1 and Comparative Example 1 as samples. (Test 1) An ordinary agar medium was dispensed and solidified on a 90 mmφ petri dish, and then Escherichia coli IFO 330
1) was coated on the entire surface so that the number of bacteria was about 10 ⁴ per plate (theoretical coating amount 2.0 × 10 ⁴ cells / plate). Next, the drip absorbent sheets prepared in Example 1 and Comparative Example 1 were cut into a circle having a diameter of 85 mmφ, the antibacterial surface was contacted with the culture medium in the petri dish, and the drip absorption sheet was inserted at 3 ° C for 10 ° C.
Stored separately at ℃ and 20 ℃, 3 hours, 6 hours,
After 9 hours and 24 hours, the drip absorbent sheet was removed, and the deoxycholate agar medium was overlaid on the ordinary agar medium. Then, the number of surviving Escherichia coli was measured. The results are shown in Table 1.

(Test 2) Using the drip absorbing sheets prepared in Example 1 and Comparative Example 1, 50 blocks of pork meat
A 3-sided pouch made of a vinylidene chloride-coated stretched nylon film 15 μm and polyethylene 60 μm double-layered film (dimension 2).
0 cm × 30 cm) and vacuum packed. This sample was stored at 1 ° C., and the number of viable bacteria and the number of coliform bacteria on the surface portion of the meat were measured at the start of storage, and after 1 week, 2 weeks, and 3 weeks. The results are shown in Table 2.

[0021]

[Table 1]

[0022]

[Table 2]

[0023]

According to the drip absorbing sheet having antibacterial properties of the present invention, not only the drip generated from food can be absorbed into the water absorbing paper through the fine communication holes of the antibacterial film and the appearance can be maintained well, Since the microorganisms on the food surface that come into contact with the antibacterial film can be sterilized or bacteriostatic, the effect of maintaining good appearance and microbial freshness of the food is exhibited.

[Brief description of drawings]

FIG. 1 is an enlarged schematic cross-sectional view showing one embodiment of a drip absorbent sheet having antibacterial properties of the present invention.

FIG. 2 is an enlarged view showing an example of an adhesive application pattern in which an antibacterial film of a drip absorbent sheet having antibacterial properties according to the present invention and a water absorbent paper are bonded together.

[Explanation of symbols]

 1 Antibacterial film having fine communication holes 2 Fine communication holes 3 Adhesive 4 Water absorbing paper 5 Adhesive application pattern

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location B65D 65/40 Z 9028-3E 81/26 J 9028-3E // A23B 4/00 9282-4B

Claims (3)

[Claims] 1. A bonded body of a water-absorbent paper and an antibacterial film which has a fine communication hole and is liquid-permeable, wherein the antibacterial film and the water-absorbent paper are bonded by partial adhesion. The antibacterial property is characterized in that at least the surface of the antibacterial film on the side opposite to the water-absorbent paper contains a silver ion-containing inorganic substance capable of gradually eluting silver ions. Drip absorbent sheet having. 2. The anti-drip absorption having antibacterial properties according to claim 1, wherein the area of the bonded portion between the antibacterial film and the water absorbing paper is 1% or more and less than 95% of the total area of the water absorbing paper. Sheet. 3. An inorganic substance containing silver ions is zeolite.
The drip absorbent sheet having antibacterial properties according to claim 1, which is one or more selected from soluble glass, weathered reef coral, layered phosphate, calcium phosphate, clay mineral, and calcium silicate.