JPH08117593A - Water absorbent sheet - Google Patents

Abstract

PURPOSE: To provide a water absorbent sheet which is flexible and has good adhesion to fresh fish when used and free from liquid dropping even after being used for water absorption. CONSTITUTION: In a water absorbent sheet which is made by covering a a composition of a material with high osmotic pressure such as hydrophilic alcohol, starch syrup, an anticeptic agent, a three-dimensional network structure of silicon dioxide with a semipermeable membrane, the composition is composed of 10-20% hydrophilic alcohol, 75-90% starch syrup, and 1-5% silicon dioxide of a three-dimensional structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-absorbent sheet used for contact dehydration for the purpose of improving the taste and preservation of fresh foods such as seafood, meat and fruit vegetables.

[0002]

2. Description of the Related Art A water-absorbent sheet comprising a semipermeable membrane and a water-absorbent agent is often used for the purpose of improving the taste and preservation of fresh food. This is disclosed in, for example, an osmotic pressure contact dehydration sheet of JP-B-58-58124, a semipermeable membrane contact dehydration film of JP-B-58-43922, and a dried food sheet of JP-B-61-3337. There is. These water absorbing sheets have a structure in which a water absorbing agent is enclosed inside a single sealed bag having a semipermeable membrane.

When used for dehydration and drying of fresh fish or the like, a water absorbing sheet of a normal size has no choice but to wrap the outside of the fish to dehydrate it, and the inner part from which the viscera is taken out has a particularly large amount of water, so that it is dried. Was insufficient. On the contrary, when the inner part is dried sufficiently, the outer part is too dry, which causes a problem of deteriorating the product value.

From this point, it has been clarified that the use of a high osmotic pressure substance in place of the polymer water-absorbing agent has an effect of preventing excessive drying (Japanese Utility Model Publication No. 4-33491).

[0005]

A problem that has arisen with the use of such a water-absorbing sheet is that the product to be dehydrated has a hard, rugged feeling when not in use or at the beginning of use. There is a problem that it is difficult to put the water on the water absorbent sheet and the liquid drips when the water absorbing sheet finishes absorbing water. In other words, the initial feeling of being stiff is that it does not have flexibility, and the conventional product does not have the flexibility suitable for use and has poor adhesion to fresh fish and the like. Further, the liquid dripping is that the absorbed water drips together with the contents of the water absorbing sheet. There is no conventional water absorbing sheet that takes this dripping into consideration. Therefore, in the present invention, a water-absorbent sheet that is flexible when used, has good adhesion to fresh fish, etc., and does not drip even in a water-absorbed state after use, was examined.

[0006]

The water absorbing sheet of the present invention comprises:
A water-absorbent sheet obtained by coating a compound of hydrophilic alcohol, starch syrup, preservative, and silicon dioxide three-dimensional network structure as a highly permeable material with a semipermeable membrane.

The formulation is a hydrophilic alcohol 10-20%,
More preferably 14-18%, starch syrup 75-90%, more preferably 80-85%, silicon dioxide three-dimensional network structure 1-5%,
More preferably, the mixture is uniformly mixed within the range of 1.5 to 2.5%.

Glycerin, ethylene glycol, propylene glycol and the like have been conventionally proposed as the hydrophilic alcohol as a highly permeable substance used for such a water absorbent sheet. In order to improve the initial water absorption performance at the beginning of use, it is better to set the ratio of hydrophilic alcohol to 20% or more. With this, when vinylon film is used for the semipermeable membrane, it passes through it and glycerin passes through it. Is not good because it oozes out. Meanwhile, the mixing ratio of hydrophilic alcohol is 10
If it is less than%, the whole is cured and it becomes difficult to blend the blended liquid. Therefore, of course, the product becomes hard and loses the flexibility required for use. 14 to 18% is most preferable in order to maintain the water absorption performance and reduce the eluate.

Addition of another highly permeable material to this will make it more excellent in water absorption. As the highly osmotic substance, edible sugars such as pullulan, glucose, mannitol, sorbitol, starch syrup, sucrose, and isomerized sugar are known. Among them, starch syrup is most preferable for this composition.

A feature of the formulations of the present invention is the inclusion of a silicon dioxide three-dimensional network. Adding inorganic powder to this kind of water absorbent sheet is not specially new, but the purpose of conventional inorganic powder addition is to increase the viscosity of the compound, such as talc, bentonite, clay, silica powder, etc. Among these, bentonite is known to be the most preferable. However, in the case of the conventional formulations, none of these is sufficient for solving the above-mentioned tingling sensation and liquid sagging. In addition, when the silicon dioxide three-dimensional network structure is used, white turbidity and opacity are eliminated as compared with the case where other inorganic substances are used, and a transparent water-absorbent sheet which is like a food packaging can be obtained.

The silicon dioxide three-dimensional network structure used here is manufactured by the following method. That is, the silicic acid produced by the reaction of sodium silicate and acid grows into primary particles of a certain size determined by the production conditions. After that, the primary particles are three-dimensionally linked by a chemical bond (siloxane bond) and become a secondary aggregate to further grow. In this way, a highly porous network structure is created, resulting in silica having a large internal surface area and pore volume. Then, reticulated silicon dioxide having various pore sizes can be obtained by changing the production conditions of primary particles.

The film used for the water-absorbent sheet has a semipermeable membrane on at least one side thereof, and publicly known polyvinyl alcohol, cellophane, sulfuric acid paper and the like can be used. Among them, the polyvinyl alcohol film is preferable.

[0013]

The present invention has a hydrophilic alcohol, starch syrup as a highly osmotic substance, and a silicon dioxide three-dimensional network structure as the main components, so that they are flexible and have good adhesion to fresh fish when used. The water-absorbent sheet did not drip even when it was in a water-absorbing state after use. In particular, when bentonite is used in place of the silicon dioxide three-dimensional network structure, the content of bentonite moves (dripping) at 0.5% of the allowable upper limit of addition of food additives, whereas the silicon dioxide three-dimensional structure is present. In the case of the network structure, no liquid dripping was observed even at 2% or less of the allowable upper limit of addition of food additives. In addition, as compared with the case of using an inorganic substance, white turbidity and opacity are eliminated, and a transparent water-absorbent sheet like a food packaging is obtained.

[0014]

[Examples] Hydrophilic alcohols such as glycerin, propylene glycol, and high-permeability substances, starch syrup (special enzyme starch syrup: trade name Marutrap manufactured by Hayashibara Shoji Co., Ltd.), paraoxybenzoate ester preservative (Ueno Pharmaceutical Co., Ltd. ) Trade name Neoplatin)) and silicon dioxide three-dimensional network structure (Fuji Silysia Chemical Ltd. trade name Silopage) were mixed well in a container at the respective mixing ratios shown in the upper part of Table 1 to prepare a water absorbing agent. .

[0015]

[Table 1]

Each of the water absorbing agents was sandwiched between two 20 μm polyvinyl alcohol films to form a sheet having an average thickness of 0.5 mm, and the periphery was heat-sealed to obtain a water absorbing sheet. Table 1
A water absorption test was conducted on the water absorbent sheets of Examples 1, 3, 4 and Comparative Example 3. In the water absorption test, a cloth of 60 g containing 140 g of water was sandwiched between the water absorbent sheets to measure the amount of water reduction from the cloth, that is, the water absorption of the water absorbent sheet. The results are shown in Table 2 and FIG. It has been clarified that the silicon dioxide three-dimensional network structure compound of the example absorbs water more slowly than the bentonite compound of the comparative example and exhibits excellent performance in the production of semi-nama products.

[0017]

[Table 2]

The water absorbing agent of Example 4 in Table 1 was used as a water absorbing sheet, and three grated eels were spread and placed thereon. The water absorbing sheet was rotated to wrap the whole and put in a refrigerator to conduct a water absorption test for 6 hours. It was Table 3 shows the results. The sharks of four specimens A to D were satisfactorily dehydrated after 6 hours. The water-absorbent sheet was supple and had good adhesion to fish, and the water-absorbing agent did not move unevenly during use and did not drip.

[0019]

[Table 3]

On the other hand, the water-absorbent sheet of Comparative Example 2 was turned to wrap it, put it in the refrigerator as in the above-mentioned Example, and let it stand for 6 hours. As a result, eels were found to be well dehydrated, and some were insufficiently dehydrated in the water absorbent sheet where the water absorbing agent was moving. Was given.

[0021]

Industrial Applicability According to the present invention, it is possible to provide a sheet capable of effectively absorbing water from fresh foods such as seafood, meats and fruits. The water-absorbent sheet of the present invention has excellent flexibility, moderate water absorption, and is excellent in that no liquid drips after water absorption.

[Brief description of drawings]

FIG. 1 is a graph showing a water absorption state.

Claims (2)

[Claims] 1. A water-absorbent sheet obtained by coating a semi-permeable membrane with a mixture of a hydrophilic alcohol, a starch syrup, an antiseptic, and a silicon dioxide three-dimensional network structure as a highly permeable material. 2. A water-absorbent sheet, wherein the composition according to claim 1 is 10 to 20% hydrophilic alcohol, 75 to 90% starch syrup, and 1 to 5% silicon dioxide three-dimensional network structure.