JP3301665B2 - Dehydration sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dewatering sheet.
More particularly, the present invention relates to a dehydration sheet suitable for contact dehydration of food, which is applied to a wide range of fields such as drying of fish, meat and vegetables, pretreatment of freezing, food preservation, food processing and cooking. be able to.

[0002]

2. Description of the Related Art A large number of contact dewatering sheets which combine a semipermeable membrane with a substance having a high osmotic pressure and utilize the difference in osmotic pressure have been proposed. For example, Japanese Patent Publication No. 58-58124,
There are JP-A-57-167834 and JP-B 1-222816. Conventional dewatering sheets all contain a polymer water-absorbing agent having a high water-absorbing ability, and have a long-time water-absorbing performance and a high water-absorbing capacity. However, the polymer water-absorbing agent used in the conventional dewatering sheet has a problem that when absorbing water containing ions such as Ca, Mg, Na, and Cl, the water-absorbing ability is greatly reduced. In addition, there is a problem that it is not completely safe if there is a risk of contact with food. On the other hand, in consideration of safety, a dewatering sheet containing no polymer water absorbing agent has been proposed in Japanese Patent Publication No. 4-33491. This dewatered sheet contains a water-soluble paste as a high osmotic substance and a thickener, but the viscosity of the dewatered sheet after water absorption is large, so that the form of the dewatered sheet changes greatly and it can be used only once. There were drawbacks. That is, the hardness and flexibility of the dewatering sheet in which the semi-permeable membrane is interposed with the hyperosmotic substance change depending on the water content of the hyperosmotic substance. There is a problem in actual use that the hardness and flexibility of the sheet greatly change due to the movement of water from the food and the change in the water content.
If the state before use is a hard plate, the adhesion to food becomes insufficient, and the performance cannot be sufficiently exhibited. Further, if the sheet in the water-absorbed state is soft and has no shape-retaining property, it is difficult to remove the sheet, and there is a possibility that the sheet may be damaged and the food may be contaminated.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a dehydration tool which has a small decrease in viscosity even after dehydration (water absorption), can be used repeatedly, is safe, and hardly generates incineration residues. is there.

[0004]

Means for Solving the Problems The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, have found that an aqueous solution of an edible saccharide,
A small amount selected from glycerin and propylene glycol
At least one kind of high osmotic pressure substance and a microfiber were coated with a water-permeable semipermeable membrane to find a dehydrated sheet for food , and the present invention was completed.

[0005] The hyperosmotic substance used in the dewatering sheet of the present invention refers to a substance having an osmotic pressure capable of removing (dehydrating) water from animals and plants. In practice, removing water from food requires an osmotic pressure of 10 atmospheres or more. Examples of such hyperosmolar substances include starch syrup, sucrose, isomerized sugar, pullulan, glucose, fructose, mannitol, sorbitol, and malgetol. Of edible sugars and compounds such as glycerin and propylene glycol.
In particular, an aqueous solution of an edible saccharide having a molecular weight of several tens to several hundreds is preferable for the use of the present invention. These may be used alone or as a mixture of several types.

[0006] The microfibers used in the dewatering sheet of the present invention are obtained by subjecting natural fibers or synthetic fibers to microfibrillation by strong mechanical shearing force. Examples of the fiber serving as a raw material of the fine fiber include natural cellulose fiber, regenerated cellulose fiber such as rayon, and synthetic fiber such as vinylon, polyester, acrylic, nylon, polyethylene, polypropylene, and aramid fiber. Among these, natural cellulose fibers are particularly preferable from the viewpoint of product safety. The device for applying the mechanical shearing force used in the production of the microfiber used in the present invention is not particularly limited, but a high-pressure homogenizer is generally used. The diameter of the microfiber used in the present invention needs to be 0.001 to 3 microns, preferably 0.003 to 1 micron, more preferably 0.005 to 0.3 micron.
If the diameter of the fine fibers is too large, the sheet in the water-absorbed state becomes soft, and the shape-retaining property decreases.

The blending ratio of the hyperosmotic substance and the microfibers contained in the dewatering sheet of the present invention can be appropriately changed depending on the kind of the target food and the desired amount of dehydration. 0.1 microfiber per part
-20 parts by weight are preferred. When the amount of the fine fibers is less than 0.1 part by weight, the thickening effect is poor, and when the amount is more than 20 parts by weight, the viscosity becomes too high, and the workability at the time of inclusion in the water-permeable semipermeable membrane is deteriorated. There is.

[0008] The water-permeable semipermeable membrane used in the present invention includes:
Water-permeable membranes such as ordinary cellophane paper, low-stretch vinylon film (polyvinyl alcohol), collodion membrane, ethylene-vinyl acetate copolymer film, and low-stretch nylon film are suitable. Above all, vinylon films for food packaging are preferred. When an edible saccharide aqueous solution is used as the hyperosmotic substance, the dehydrated sheet of the present invention further includes, as another component, a hydrophilic alcohol as a humectant, for example,
It is preferable to add glycerin, propylene glycol, or the like, which can prevent storage of the dehydrated sheet and excessive drying at the time of use, and is effective in maintaining a certain degree of flexibility. It is also effective in terms of hygiene management to add substances having a bacteriostatic action such as ethanol, egg white lysozyme, amino acids, and organic acids.

FIG. 1 is a schematic view showing one embodiment of a sheet-like dewatering sheet according to the present invention. The surface of the sheet is covered with a water-permeable semipermeable membrane 1 and contains a mixture 2 of hyperosmotic substances and microfibers inside. It may further contain humectants and bacteriostatic agents. The semipermeable membrane on the surface is well permeable to water, ammonia, and amines, but is not permeable to amino acids, nucleic acids, sugars, etc., which is convenient for dehydrating foods. Also, the hardness inside the sheet depends on the conditions used,
Generally 15,000 to 50,000 m at 20 ° C
Good viscosity of Pa · s. If it is harder than 50,000 mPa · s, adhesion to food is poor, and if it is softer than 15,000 mPa · s, it may move in the sheet, the thickness may be uneven, and dehydration may be uneven. The dewatering sheet of the present invention is characterized in that the hardness does not change much even if the food is dewatered several times.

[0010]

The present invention will be described in more detail with reference to the following examples. Example 1 55 parts by weight of dry sorbitol as a hyperosmotic substance, 20 parts by weight of glycerin as a hyperosmotic substance (also serving as a humectant), and microfibrous cellulose having a solid content of 20% as fine fibers (manufactured by Daicel Chemical Industries, Ltd.) 10 parts by weight (2 parts by weight of fine fiber equivalent) and 15 parts by weight of water were added, and the viscosity was 46,000 mP.
a · s (20 ℃, E-type viscometer, 2 rpm) to give a mixture of. Next, 50 g of the above mixture was covered with a vinylon film (manufactured by Kuraray Co., Ltd.), and the periphery thereof was heat-sealed so as to have a length of 50 cm and a width of 30 cm. Using this sheet, body length 20cm open to two
Was wrapped and left in the refrigerator. After 6 hours, the horse mackerel was well dehydrated. Next, the sheet surface is wiped, and in the same manner as above, using a newly opened horse mackerel,
When the fish was used three more times, the degree of dehydration of the fish was good. Even after four uses, the mixture in the sheet was hardly offset. Remove the mixture from the sheet,
When the water content was measured, the water content in the original mixture was 2
Although it increased from 2.0% by weight to 35.5% by weight, the viscosity was not so reduced to 41,000 mPa · s.

Example 2 A mixture was prepared in the same manner as in Example 1 except that 5 parts by weight of fine fibrous cellulose (1 part by weight in terms of fine fiber content) and 20 parts by weight of water were used. Created. The viscosity of the obtained mixture is 31,000 mPa · s
Met. Next, a sheet was prepared in the same manner as in Example 1, and overnight drying of horse mackerel was performed. As a result, the degree of dehydration of the fish was good, and the mixture in the sheet was hardly offset. When the mixture was taken out of the sheet and the water content was measured, the water content in the original mixture was increased from 24.0% by weight to 36.4% by weight, but the viscosity was 23,000%.
mPa · s was not so reduced.

Comparative Example 1 A mixture was prepared in the same manner as in Example 1 except that 25 parts by weight of water was used without adding microfibrous cellulose. The viscosity of the resulting mixture is 2
The sheet was as low as 90 mPa · s, and a good sheet was not obtained.

Comparative Example 2 In the mixture of Example 1, except that 1.6 parts by weight of sodium alginate was used in place of the microfibrous cellulose and 23.4 parts by weight of water was used instead of 15 parts by weight of water. A mixture was prepared in the same manner as in Example 1. The viscosity of the obtained mixture was 32,000 mPa · s. Next, a sheet was prepared in the same manner as in Example 1, and overnight drying of horse mackerel was performed. As a result, good dehydration performance was exhibited until the second time.
After the second use, the sheet lost shape retention, and the mixture in the sheet was offset to the edge, making it difficult to use the third time. The mixture was taken out of the sheet after use twice, and the water content was measured. The water content in the original mixture was 23.4% by weight to 33.4%.
Although slightly increased to 1.5% by weight, the viscosity was 9,0%.
It was reduced to 00 mPa · s.

Comparative Example 3 Example 1 was repeated except that 3 parts by weight of bentonite was used in place of the microfibrous cellulose and 22.0 parts by weight of water was used instead of 15 parts by weight in the mixture of Example 1. A mixture was prepared in the same manner as described above. The viscosity of the resulting mixture is 4
It was 8,000 mPa · s. Next, a sheet was prepared in the same manner as in Example 1, and overnight drying of horse mackerel was performed. As a result, good dehydration performance was exhibited up to the fourth time, but after four times use, the sheet lost its shape retention. As a result, the mixture in the sheet was biased toward the end, and it was difficult to use the mixture for the fifth time. The mixture was taken out of the sheet after use four times, and the water content was measured.
The water content in the original liquid mixture increased from 22.0% by weight to 34.8% by weight, and the viscosity decreased to 13,000 mPa · s.

[0015]

The dewatered sheet of the present invention is excellent in dewatering performance, has a small decrease in viscosity after water absorption, is excellent in shape retention, can be used repeatedly, and hardly produces incineration residues.
It is extremely useful because it is secure.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an example of a dewatering sheet of the present invention.

[Explanation of symbols]

 1 ... water-permeable semipermeable membrane 2 ... high osmotic pressure substance and microfiber 3 ... seal part

Claims (3)

(57) [Claims] An aqueous edible sugar solution, glycerin and glycerin
A dehydrated sheet for food comprising at least one kind of high osmotic pressure substance selected from propylene glycol and fine fibers covered with a water-permeable semipermeable membrane. 2. A high osmotic pressure substance comprising an aqueous solution of an edible saccharide.
Moisturizer and microfibers made of high quality, hydrophilic alcohol
A dehydrated food sheet coated with a water-permeable semipermeable membrane. 3. A fine particle per 100 parts by weight of a hyperosmotic substance
0.1 to 20 parts by weight of the fiber,
The viscosity at 20 ° C. of the mixture of fine fibers is 15,
000 to 50,000 mPa · s.
3. The dehydrated sheet for food according to 2.