JPS633752A - Base material for absorbing drip of fish, shellfish or animal meat - Google Patents

Abstract

PURPOSE:To obtain the titled base material having excellent absorptivity of drip and capable of preventing the peeling and falling-off a water-absorbing resin from fiber even after swollen by water-absorption, by applying a water-soluble ethylenic unsaturated monomer to a fiber sheet, polymerizing the monomer and using the obtained sheet as the objective base material. CONSTITUTION:The objective base material is a sheet produced by applying a water-soluble ethylenic unsaturated monomer to a fiber sheet and polymerizing the monomer and, if necessary, covering the coated sheet with another sheet. The fiber sheet used in the above process is preferably a nonwoven fabric made from various kinds of fiber webs. The fiber may be hydrophilic or hydrophobic. In the case of using a hydrophobic fiber, at least a part of droplet of aqueous solution of monomer are sporadically distributed in the water- absorbing resin in a state firmly including the fiber in the droplet. The falling- off of the resin from fiber can be completely prevented even if the resin is in swollen state. Since the water-absorbing resin particles are sporadically distributed, the water-absorption performance can be fully exhibited and, accordingly, the use of a hydrophobic fiber is especially preferable.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a base material for absorbing drips from seafood or meat, and more specifically, it is placed at or around the bottom of a container containing seafood or meat. This invention relates to a drip-absorbing base material that absorbs liquid substances that are eluted and leached from meat.

[Conventional technology and its problems]

Conventionally, seafood and meat are sold at supermarkets or retail stores by placing sponge, nonwoven fabric, paper, etc. on the bottom or around the bottom of a lightweight resin molding, and placing the above-mentioned foods on top.

In some cases, seafood and meat may be immersed in cold salt water before being placed in lightweight resin moldings to prevent elution from these foods.
Attempts have been made to prevent the formation of leachate, and preservation of freshness by using oxygen scavengers and carbon dioxide gas generating agents has been proposed (Japanese Patent Laid-Open Nos. 58-138336 and 175431-1983).
(see publication).

In addition, a method has been proposed that is expected to maintain freshness by combining a laminated molded product in which super absorbent resin powder is sandwiched between paper and paper or between paper and polyester film, an oxygen absorber, and a carbon dioxide gas generating agent. (Refer to Japanese Unexamined Patent Publication No. 107134/1983).

However, despite such treatment, elution and leachable substances derived from seafood and meat, such as blood and body fluids, ooze out due to the thermal insulation treatment during thawing and the passage of time after thawing.
The non-woven fabric, paper, etc. at the bottom cannot absorb it completely, which impairs the beauty of the product, as well as causing taste and spoilage.

In addition, the super absorbent resin laminated base material disclosed in Japanese Patent Application Laid-open No. 58-107134 has the ability to absorb elution from seafood and meat.
When leaching substances such as blood and body fluids are absorbed, the superabsorbent resin swells and the swollen resin leaks from the surface of the porous material, and the adhesive that maintains the laminated base material leaches out, resulting in the use of an adhesive. There are drawbacks such as poor swelling of the super absorbent resin.

In particular, the elution of superabsorbent resins and adhesives is a serious problem under the Food Sanitation Act, and has the disadvantage of not being practical.

[Means for solving problems]

In view of this situation, the inventors of the present invention have developed a system that instantly absorbs a large amount of eluates and leachables derived from seafood and meat, that is, blood and body fluids. As a result of intensive research and development of base materials that do not require use and are safe under the Food Sanitation Act, a water-absorbent resin immobilized sheet obtained by polymerizing ethylenically unsaturated monomers, which are the raw materials for water-absorbent resins, on a fibrous base material. The present invention has been completed based on the discovery that the water-absorbing resin is excellent in absorbing drips and that the water-absorbing resin does not peel off or separate from the fibers even after absorption and swelling.

That is, the present invention provides a base material for absorbing drips from seafood and meat, which is made of a sheet obtained by adhering a water-soluble ethylenically unsaturated monomer to a fiber sheet and then polymerizing the same, and a base material for absorbing drips from seafood and meat. The present invention provides a base material for absorbing drips from seafood and meat.

The fibrous sheet used in the present invention is preferably a nonwoven fabric made from various fibrous webs.

Either hydrophilic fibers or hydrophobic fibers can be used as the fibers, but when using hydrophobic fibers, it is preferable that the droplets of the 7-summer aqueous solution are small (in a state where the fibers are tightly wrapped around the fibers). A continuously distributed water-absorbing resin is obtained, and even when the resin swells, it does not fall off from the fibers, and since there is no continuous sheet-like water-absorbing resin between the fibers, the water-absorbing performance is improved. This is particularly preferred since it can be fully demonstrated.

Hydrophilic fibers used include wood pulp, cotton, wool, rayon, acetate, vinylon, etc. Hydrophobic fibers include polyester, acrylic, nylon, polyethylene, polypropylene, polyvinyl chloride, etc. Blended fibers are exemplified, and those mainly composed of these hydrophobic fibers are preferable. In addition to the above-mentioned hydrophobic fibers, hydrophilic fibers such as rayon may also be made hydrophobic on the surface with a rosin-based or alkyl ketene dimer-based sizing agent, a cationic surfactant, or the like.

The water-soluble ethylenically unsaturated monomer used in the present invention may be any monomer as long as it can be converted into a superabsorbent resin and provides good absorption performance after polymerization and drying. - Water-soluble monomers that provide such performance for boat fishing include water-soluble monomers having groups derived from carboxylic acid or/and its salts, phosphoric acid or/and its salts, sulfonic acid or/and its salts as functional groups. ethylenically unsaturated monomers. Specifically, (meth)acrylic acid or its salt, vinylsulfonic acid or its salt, vinylphosphonic acid or its salt, etc. can be exemplified, and preferably (meth)acrylic acid or its salt.
Acrylic acid or its salt. The resulting resin may be a homopolymer or copolymer of these monomers, or a graft polymer to starch or cellulose.

Furthermore, it is also possible to add crosslinking agents and additives to these monomers to improve absorption performance.

Examples of crosslinking agents include water-soluble polyfunctional ethylenically unsaturated monomers such as methylene bisacrylamide, ethylene glycol di(meth)acrylate, and polyethylene glycol di(meth)acrylate, as well as ethylene glycol diglycidyl ether and polyethylene glycol diglycidyl. Water-soluble compounds having two or more functional groups that can react with functional groups such as carboxylic acid, phosphoric acid, and sulfonic acid, such as polyglycidyl ethers such as ethers, polyols such as glycerin and pentaerythritol, and polyamines such as ethylenediamine. etc. can be suitably used.

Examples of additives include finely ground fillers such as talc, clay, and diatoms.

The method for attaching the monomer aqueous solution to the fiber sheet is not particularly limited, but there are methods for attaching the superabsorbent resin so that at least a portion of the superabsorbent resin exists in a discontinuous manner surrounding the fiber web, and the amount of attachment. It would be better if For example, known printing methods such as screen printing and gravure printing, or spraying or spraying using a spray can be used. It is also possible to use polymerizable inert viscosity modifiers and foaming agents to increase the efficiency of deposition. Also,
The absorbent substrate may be printed with a suitable pattern when used.

The monomer aqueous solution adhered to the fiber sheet in this manner is polymerized by known means and converted into a super absorbent resin, which is used as a drip-absorbing base material. As a polymerization method, for example, a method using heat, light, accelerated electron beam, radiation, ultraviolet light, etc. can be used. If necessary, it is preferable to carry out the polymerization under an inert atmosphere, for example, under a nitrogen stream, for the purpose of smoothly proceeding the polymerization. After polymerization, the water-containing absorbent substrate may be dried by hot air, microwaves, infrared rays, or the like.

In the present invention, the content of the polymer is preferably 10 to 90 weight %, more preferably 15 to 80 weight %, based on the solid weight of the absorbent composite.

Furthermore, by covering the surface to which the water-absorbing resin is attached with a second fiber sheet, the initial absorbency can be improved and the feeling of wetness on the surface can be suppressed.

Examples of fibers suitable for the second fiber sheet include nonwoven fabrics of rayon, acetate, polyester, polypropylene, etc., or composites thereof, pulp molded products, and papers of various basis weights.

An example of a method for covering with the second fiber sheet is to place it on the water-absorbing resin while it still has moisture after polymerization and dry it while applying pressure.

Further, the opposite surface may be covered with a liquid-impermeable film if necessary.

〔Example〕

Next, the present invention will be explained in more detail by giving examples of manufacturing a super absorbent resin fixed sheet base material, comparative manufacturing examples, examples, and comparative examples, but the present invention is not limited thereto.

Production Example 1 A neutralized sodium acrylate aqueous solution having a solid content of 40% by weight and 70% by mole was prepared. Add 1% by weight of sodium persulfate (based on sodium acrylate monomer) and 500p of sodium persulfate to this solution.
pm of methylene bisacrylamide (vs. sodium acrylate monomer) was dissolved, and then nitrogen gas was blown into the solution to remove dissolved oxygen.The above solution was made from only polyethylene-polypropylene composite fibers (ES fibers) with a basis weight of 45 g/m''. A hydrophobic fiber web (A) consisting of equal weights of polyethylene-polypropylene composite fibers (ES fibers) and rayon (B), 15 parts by weight of polyethylene-polypropylene composite fibers (ES fibers) and rayon 8.
Each of the polymers was sprayed uniformly onto a fibrous web (C) consisting of 5 parts by weight so that the polymer coating amount was 150 g/m2 (polymer coating amount was 60 g/m).

The web coated with this monomer was left for 5 minutes in an oven completely purged with nitrogen at a temperature of 75% relative humidity to polymerize. Thereafter, this composite was dried under reduced pressure at 100°C to form drip-absorbing substrates (A-1) and (B-1).
, (C-1) was obtained. Moreover, before drying, hydrophilic and highly breathable paper (basis weight 49 g/m'') was placed on top and dried under pressure to form a drip absorbing base material (A-2).

(B-2) and (C-2) were obtained.

Comparative Production Example 1 Water is sprayed on hydrophilic and highly breathable paper (tsubo it 49 g/m") (100 m 110 + 2). After wetting the L surface to the extent that it is wet, 1 m2 of highly water-absorbent cross-linked polyacrylate powder is sprayed.
Per log (D), 30g (E), 60g (F)
Sprinkle it evenly, sandwich it with highly breathable paper of the same basis weight, add vinyl acetate resin partially to prevent it from peeling off after absorbing water, and then cover it with a low-density polypropylene film. The magnification of adhesion when placed and pressed (film thickness: 0.03 mm) is also suppressed compared to the product of the present invention.

In addition, those using adhesives had a strange odor and were unsuitable for use as substrates for absorbing drips from seafood, meat, and the like.

In particular, the products of the present invention (A-2) and CB-
2).

(C-2) is superior in terms of water absorption rate. That is, due to the capillary phenomenon between paper fibers, water is more smoothly absorbed into the superabsorbent resin.

Example 2 Styrofoam container (8cm x 12cm x 2
cm), the invention products (A-2), (C-2), comparison holes (D), (F), and paper towels, both 5 cm
A piece of tuna sashimi (200g of fresh tuna sashimi of 20g each) was placed on the bottom, and left at 15°C and relative humidity of 75% for 2 days. The number of precipitated water-absorbing resins in the comparison holes was measured using the method of Example 1, and the amount of blood and body fluid absorbed from the sashimi and the weight of the liquid that could not be absorbed and had accumulated at the bottom of the Styrofoam container were measured. . In addition, the aesthetic appearance was visually judged (◯: good with no particular problems, ×: unsightly), and the results are shown in Table 2.

Table 2 Example 3 Inner diameter (33.5cm x 55.Ocm x 11.5
Inventive product (C-2) in a Styrofoam container of cm)
A piece of 30 cm + x 50 cm for both comparison holes (F) was placed on the bottom, and frozen tuna (8 kg each) was placed on top and thawed at 10°C. After thawing, the number of precipitated water absorbent resins, the amount absorbed by the molded sheet, and the weight of liquid that could not be absorbed and had accumulated at the bottom of the Styrofoam container were measured. The results are shown in Table 3.

Table 3 Example 4 Styrofoam container (8cm x 12C+II
A 5 cm x 10 cm piece of both the invention product (C-2) and the comparative product (F) was placed on the bottom of a 2 cm), 500 g of beef liver was placed on top of it, and after sealing, it was left at 15 °C for 3 days. The superiority of the product of the present invention was evaluated in the same manner as in Example 2.

The results are shown in Table 4.

Table 4

Claims (1)

[Scope of Claims] 1. Fish and shellfish made of a sheet obtained by adhering a water-soluble ethylenically unsaturated monomer to a fiber sheet and then polymerizing it;
Base material for absorbing drips from meat. 2. A base material for absorbing drips from seafood and meat, which is obtained by attaching a water-soluble ethylenically unsaturated monomer to a fiber sheet and then polymerizing the sheet, which is then covered with another sheet.