JP2001019054A - Water absorbing material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To well fit to the shape of an object to be dehydrated to improve adhesion by applying an adhesive on a portion of one of surfaces of a base material in a manner that a form and a contact area with the object varies according the shape of the object to be dehydrated. SOLUTION: After an object 2 to be dehydrated, a food for example is mounted on a sheet 1, a sheet 1" is put over with ends held in hands, and an adhesive portion 3 along an outer periphery in a shape of the object 2 is slightly pressed by a finger from over the sheet 1" to have the upper and lower sheets 1, 1" stuck to each other. Alternatively, when the sheet is two-folded to overlay a sheet 4" over a sheet 4 with a slight shift, the sheet 4 is equipped with an adhesive applied portion 5 and the sheet 4" is equipped with an applied portion 5". Further, when the sheet is two-folded to overlay a sheet 6" over a sheet 6 with a slight shift in a triangular form, an adhesive applied portion 7 is provided at a corner of the sheet 6". The object 2 such as food can be stored, transported or the like while being entirely wrapped by the water absorbing sheets 1, 1" or the like and drips or the like can be uniformly removed from the whole object.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-absorbing material having a performance of absorbing moisture and the like, and in particular, to improve the adhesion to foods and the like, and to easily diversify the form according to the shape of the foods and the like. It relates to a water-absorbing material that can be achieved.

[0002]

2. Description of the Related Art The exudation of water (drip) contained in fresh foods and the like has caused a decrease in color, flavor, texture, and the like in storage and transportation of foods, and has caused bacterial propagation. Therefore, use of a water-absorbing material for removing drip or the like flowing out of food or the like has been studied, and various absorbents have been studied. For example, as a drip absorbing material, a non-woven fabric or a fiber-supported product of a superabsorbent polymer, and a drip that can be absorbed with time can be absorbed.
And a water-absorbing sheet as disclosed in Japanese Patent Publication No. 55-55.

[0003]

However, among these water-absorbing sheets and the like, there is a stiff sheet, and a sheet which is poor in flexibility and does not conform to the shape of food or the like when brought into contact with food or the like. is there. In particular, in a water-absorbent sheet made of a plastic material, a stiff base sheet may be laminated in order to avoid curling, and when the water-absorbent sheet is brought into contact with food or the like, the sheet may warp due to its stiffness. is there. In this way, when the sheet does not conform to the shape of the object to be dehydrated such as food and cannot be in close contact, dehydration of the portion where the object is in contact with the sheet is sufficient, but the portion of the portion not in contact with the sheet is sufficient. Dehydration becomes insufficient, and there is a fear that dehydration from the target object cannot be uniformly performed as a whole.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to conform to the shape of an object to be dehydrated, for example, food, etc., and to have good adhesion to food, etc. It is to provide a water absorbing material.

[0005]

The water-absorbing material of the present invention comprises:
An adhesive is applied to a part of one surface of the base material so that the form and the contact area with the object can be changed according to the shape of the object to be dehydrated. Here, the adhesive may be a slightly tacky re-adhesive adhesive. Further, the adhesive may be a hot melt adhesive.

In the water-absorbing material of the present invention, since the adhesive is partially applied to one surface of the base material, the food or the like is placed on the surface to which the adhesive is applied, and then covered. By pressing the adhesive portion with a finger or the like and temporarily adhering the water-absorbing material so that the state of contact with the water-absorbing material can be maintained, the water-absorbing material can be prevented from warping.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The water absorbing material of the present invention has a structure in which an adhesive is applied to a part of one surface of a substrate. There is no particular limitation on the shape or amount of the portion where the adhesive is applied, but the shape can be easily changed according to the shape of the object to be dehydrated so that the contact area with the object can be changed. It is necessary to provide an adhesive application portion. In the present invention, the adhesive is applied by selecting an appropriate portion of the water-absorbing material so that there is at least one portion where the adhesive is applied and the contact area with the object after deformation of the form is as large as possible. It is preferable that the adhesive-applied portion is arranged at a position where it can be adhered to the portion.

For example, in the case of a sheet-shaped water-absorbing material, it is preferably applied to a part of one surface of the sheet. Specifically, the water-absorbing material is cut from an end portion of the sheet cut into a size which can be easily applied to an object. It is preferable that the coating is applied in a dotted line shape on the inner circumference side of about 1 cm. FIG. 1A shows a sheet of the water-absorbing material to which the adhesive has been applied. The present invention will be specifically described with reference to FIG.
After the object 2 to be dehydrated, for example, food, is placed on the sheet 1, the end of the sheet 1 'is held by hand, and the sheet 1' is placed on the food.
And the upper and lower sheets can be bonded together by lightly pressing the outer peripheral adhesive portion 3 of the shape of food or the like with a finger from above the sheet. In addition, how to cover the sheet,
For example, depending on the shape of the target object and the sheet, the contact area may be changed such that a quadrangular sheet is folded in half vertically (including a bag-like shape), folded in a triangle, and placed in a shifted triangle. It can be appropriately selected so as to increase the size, and the size of the overlapping portion can be appropriately adjusted by changing the folding position. FIG. 1B shows a state in which the sheet of the water-absorbing material is folded into two, and the sheet 4 ′ is overlapped with the sheet 4 by being slightly shifted. It is possible to increase the contact area even for an object having such a shape. In the case of this sheet, the adhesive applied portion is, for example, the adhesive applied portion 5 on the sheet 4.
The sheet 4 'may be provided with an application portion 5'. FIG. 1C shows a state in which the sheet of the water-absorbing material is folded into two, and the sheet 6 ′ is superimposed on the sheet 6 with a slight shift in a triangular shape. In this case, the adhesive application portion 7 can be provided at a corner of the sheet 6 '. With this configuration, it is possible to freely adapt to a considerably small object.

In the present invention, since the food and the like can be stored and transported in such a manner that the food and the like are completely wrapped in the water-absorbent sheet, the drip and the like can be uniformly dehydrated from the whole food.

[0010] It is preferable that the water-absorbing material is applied with an adhesive on a base material, and then a release paper is stuck on the application surface. In this case, even if the sheets of the water-absorbing material are stacked and stored, no blocking occurs.

The adhesive used in the present invention is designed so that it can be taken out without damaging the food or the like after the dehydration treatment, and can be easily re-adhered when the sticking part is changed.
It is preferable that the adhesive is a slightly tacky adhesive that can be peeled off and re-adhered, and that the adhesive effect be maintained. For example, a hot melt adhesive is preferably used. In particular, when the water-absorbing material of the present invention is used for foods and the like, an adhesive that does not pose a problem in food hygiene is selected. Adhesives preferably used in the present invention include polyamide-based, polyester-based, and polyurethane-based adhesives.

The substrate of the water-absorbing material to which the adhesive according to the present invention is applied may be any film as long as the adhesive can be applied so as to exhibit the effects of the present invention. Substrates containing a polymer-based polymer as a main component are preferably used, and furthermore, a substrate coated on one or both sides with a semi-permeable film such as polyvinyl alcohol or cellophane on a film containing a polyethylene oxide-based polymer as a main component is preferable. Used.

As the polyethylene oxide polymer used in the present invention, for example, a substance having a repeating unit represented by the following general formula (1) is preferable because of its good thermoformability.

Embedded image (Where A is

Embedded image When

Embedded image And the additional form is

Embedded image Where a, b and c are each an integer of 1 or more, and a weight ratio calculated from a, b and c, 44 (a + c)
/ (Molecular weight of α-olefin oxide having 3 or more carbon atoms)
b is from 80/20 to 94/6, X is a residue of an organic compound having two active hydrogen groups, Y is a residue of a dicarboxylic acid compound or a residue of a diisocyanate compound, and Z is a carbon having 1 or more carbon atoms. It is a hydrogen group. Here, two active hydrogen groups
Examples of the organic compound having ethylene glycol, propylene glycol, bisphenol A, aniline propylene glycol, polytetramethylene glycol, and the like.

The weight ratio described above, that is, 44 (a + c)
/ (Molecular weight of α-olefin oxide having 3 or more carbon atoms)
If b, is less than 80/20, the hydrophilicity decreases, while
If it exceeds 94/6, it will be inferior in terms of water resistance and the like.
Z is a substance having a function of imparting hydrophobicity to the substance represented by the general formula (1). For example, preferable examples include an alkyl group such as an ethyl group, and the like. By being within the range, without losing hydrophilicity,
In addition, it can be insoluble in water.

Such a substance is formed by adding ethylene oxide to ethylene glycol, polymerizing an alkylene oxide, and then reacting a polycarboxylic acid compound or a diisocyanate compound with a polyalkylene oxide formed by addition polymerization of ethylene oxide. Can be.

The dicarboxylic acid compound is preferably a cyclic dicarboxylic acid compound or a linear dicarboxylic acid compound, and examples thereof include dicarboxylic acids, dicarboxylic anhydrides, and lower alkyl esters of dicarboxylic acids. Examples of the dicarboxylic acid include phthalic acid, isophthalic acid, terephthalic acid, malonic acid, succinic acid, sebacic acid, maleic acid, fumaric acid, adipic acid, and itaconic acid. Examples of the dicarboxylic anhydride include anhydrides of the above-mentioned various dicarboxylic acids. Examples of the lower alkyl esters of the above dicarboxylic acids include methyl esters, dimethyl esters, ethyl esters, diethyl esters, propyl esters, dipropyl esters and the like of the above various dicarboxylic acids.

Particularly preferred are linear dicarboxylic acids having 12 to 36 carbon atoms and lower alkyl esters thereof, and 1,10-decamethylene dicarboxylic acid, 1,14
-Tetradecamethylenedicarboxylic acid, 1,18-octadecamethylenedicarboxylic acid, 1,32-dotriacontamethylenedicarboxylic acid and the like. Examples of the lower alkyl ester include methyl, ethyl, propyl and dipropyl esters of these dicarboxylic acids. These can be used alone or in combination of two or more. Among them, it is preferable to use the above-mentioned dicarboxylic anhydride and lower alkyl ester of dicarboxylic acid from the viewpoint of ease of reaction.

The diisocyanate compound includes:
4,4'-diphenylmethane diisocyanate, toluene diisocyanate, xylylene diisocyanate, isophorone diisocyanate, methylene biscyclohexyl diisocyanate, and the like. These alone,
Alternatively, two or more kinds can be used in combination.

The film containing a polyethylene oxide-based polymer as a main component is produced by, for example, a solution casting method, a melt extrusion method, a calendering method or the like. In the case of a homopolymer of ethylene oxide, a film can be obtained by forming an aqueous solution into a film by a casting method or an extrusion method and drying the film. In addition, a material having a repeating unit represented by the above general formula (1) can easily form a film by melt extrusion molding utilizing good thermoplasticity. In addition, a heat stabilizer, an antioxidant, a colorant, and the like can be contained in the film as necessary, as long as the food is not affected.

The film containing a polyethylene oxide-based polymer as a main component may not be cross-linked, but when cross-linking can be performed by irradiating with ionizing radiation or ultraviolet rays. It is also possible to mix by heating with a crosslinking agent.

The substrate used in the present invention is preferably a film comprising a polyethylene oxide-based polymer as a main component and one or both sides of which are coated with a semi-permeable film. In the present invention, as a semi-permeable film, cellophane,
An unheated polyvinyl alcohol (hereinafter sometimes abbreviated as “PVA”) film, a stretched polyvinyl alcohol film, a heat-treated polyvinyl alcohol film, and the like are preferably used. These semi-permeable films can contain a plasticizer such as glycerin to impart flexibility.

These semipermeable films have a strong affinity for water but are insoluble in water and have a semipermeable property. That is, the semipermeable film allows the water component and the odor component to permeate, but does not allow the umami component having a large molecule to permeate. Therefore, by preserving or transporting these semipermeable films by contacting them with food, only water and the like of foods and the like are absorbed by the water-absorbing film through the semipermeable film, and the umami components of the foods and the like are removed. It is not absorbed and remains in foods. Further, by bringing the food into contact with the semi-permeable film and then forming the package into a vacuum, the food can be fixed to a sheet or the like, and can be transported safely without deteriorating while dehydrating moisture and the like.

The coating method may be any method. For example, the coating may be performed by fusing and laminating, adhering with an adhesive or the like, or may be included. In addition, the fusion and attachment of the water-absorbing film may be partially performed instead of the entire surface. However, when the water-absorbing material of the present invention is applied to foods, it is necessary to use an adhesive that does not adversely affect foods and the like. For example, it is an isocyanate type, a PVA type, a starch type, etc., and when a water-absorbing material is applied to food, the PVA type and the starch type are preferable.

As a method of coating the semi-permeable film on the water-absorbing film, for example, there is a method of thermocompression bonding the previously formed water-absorbing film and the semi-permeable film with a nip roll or a press plate. According to this method, the water-absorbing film is melted at a low temperature of about
Since it fuses with the film, the PVA film is not adversely affected by heat. Further, it is also possible to coat the PVA film while extruding the molten water-absorbing film-forming material into a film. The water-absorbing material of the present invention may be not only in the form of a sheet but also in the form of a plate, so-called dish. In the present invention, the number of water-absorbing films to be coated may be one for the front surface and one for the back surface, but is not limited thereto, and may be a plurality of water-absorbing films.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to embodiments. Example 1 After addition polymerization of ethylene glycol with ethylene oxide, butylene oxide was addition-polymerized, and methyl octadecane-1,18-dicarboxylate was added to a polyalkylene oxide obtained by addition polymerization of ethylene oxide to perform a transesterification reaction. . The thus obtained polymer compound having a weight average molecular weight of 150,000 was extruded by an extruder at a T-die temperature of 140 ° C. to a thickness of 50 μm,
A film mainly composed of a polyethylene oxide polymer was prepared. Next, a polyvinyl alcohol film was laminated on both sides of the sheet to obtain a substrate. A substrate obtained by cutting the obtained substrate into A4 size was used as the substrate.

On one side of the base material, a hot-melt adhesive 1 cm inward from the periphery (trade name “JM-
6067-C ") was applied around the circuit in a dotted line to obtain a water-absorbing material 1 of the present invention.

A horse mackerel fillet is placed on the obtained water-absorbent material 1 and then folded so that the horse mackerel fillet is sandwiched between the water-absorbent materials. So that it is in close contact with the fillet. While keeping this shape, it was stored for 24 hours in a household refrigerator.

The water-absorbent material 1 obtained and the fillet of horse mackerel after storage were evaluated as described below.
It was shown to.

Evaluation of the amount of drip of the water-absorbent material: The drip-absorbed state at the start of the contact when the fillet of the horse mackerel is brought into contact with the water-absorbent material 1, and the drip that oozes out with time (contact with the water-absorbent material) Observe the state of water absorption of (middle), "A" indicates the state where water is completely absorbed and no water is accumulated between the water absorbing material and the surface of the horse mackerel, and "B" indicates the state where water is slightly accumulated. The state in which the water was considerably accumulated was represented by "C".

Evaluation of color, grilled color, taste of horse mackerel fillet: Color: Observation of horse mackerel fillet with the naked eye shows that the surface of the fish fillet has no discoloration and exhibits a fresh color, and is represented by "A". Those having a discolored portion are represented by "B", and those having discoloration and lacking freshness are represented by "C". Burnt color: Burn the surface of the horse mackerel fillet and observe the burnt color with the naked eye. If the burnt color is good, it will be "A", if the burnt color is good, it will be "B". etc,
Those which did not have good baking color were represented by "C". Taste: 10 people tasted small pieces of horse mackerel fillet, "A" when 8 or more felt good, "B" when 7 to 5 felt good, "Good" The case where the number of persons was four or less was represented by "C".

Evaluation of weight loss rate of horse mackerel fillet: Weight loss rate of horse mackerel before and after the test was determined by the following equation.

[0032]

(Equation 1)

Comparative Example 1 Storage and evaluation were performed in the same manner as in Example 1 except that the base material in Example 1 was used as the water-absorbing material 2 as it was.
That is, a horse mackerel fillet was placed on the water absorbent material 2, the water absorbent material 2 was bent so as to cover the horse mackerel fillet, and stored in a home refrigerator for 24 hours in that state. The same evaluation as in Example 1 was performed on the obtained water-absorbent material 2 and the stored fillet of horse mackerel. Table 1 shows the results.

[0034]

[Table 1]

As is clear from the results shown in Table 1, the water-absorbent material of the present invention bends the water-absorbent material so as to conform to the shape of the fillet of horse mackerel, which is the object to be dehydrated, and then holds down the adhesive portion. As a result, the contact area between the water-absorbing material and the fillet of the horse mackerel can be increased, so that there was no dehydration unevenness and the drip could be sufficiently removed from the entire surface of the fish mackerel fillet. On the other hand, the water-absorbing material of the comparative example was bent so as to conform to the shape of the horse mackerel fillet, but there was also a portion where a gap was formed between the water-absorbing material and the horse mackerel fillet,
The contact area was smaller than in the case of the present invention. Therefore, dehydration unevenness partially occurred. In addition, the weight reduction rate of Example 1 was larger than that of Comparative Example 1, and it was found that dehydration can be sufficiently performed by using the water-absorbing material 1 of Example 1.

[0036]

As described in detail above, since the water-absorbing material of the present invention has a portion to which an adhesive is applied, the shape of the water-absorbing material can be deformed so as to conform to the shape of the object. The contact area between the conductive material and the target object can be increased by improving the adhesion between the conductive material and the target object. Therefore, dehydration could be performed from the entire surface of the object. In addition, since it can be deformed into various forms according to the shape of the target object, it can be freely deformed into a bag-like shape or the like according to use conditions, work environment, and the like, which is convenient.

[Brief description of the drawings]

FIG. 1 is a view showing a use state of a water-absorbent material of the present invention, (a) is a perspective view showing a state in which the water-absorbent material of the present invention is adapted to an object, and (b) is a perspective view of the present invention. It is a top view which shows one form using a water absorbing material, and (c) is a top view which shows another form using the water absorbing material of this invention.

[Explanation of symbols]

 1, 1 'Sheet of water-absorbing material 2 Object 3 Adhesive applied part 4, 4' Sheet of water-absorbing material 5, 5 'Adhesive applied part 6, 6' Sheet of water-absorbing material 7 Application of adhesive part

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E067 AA11 AB02 AB04 AB08 AC01 BA18A BB14A BB26A BC04A CA09 CA24 EA05 EA09 EA12 FA01 FC01 GB09 GD01 4F006 AA02 AA19 AA31 AB35 AB37 AB38 BA01 CA00 DA04 4G066 AB05A AB06 DA05 EA20 FA07 4J002 AB022 BE022 CH011 CH021 CH051 GD03 GF00 4J004 AA06 AA14 AA15 AB01 AB03 CA02 CA03 CA06 CC02 CC03 DB02 FA06 FA10

Claims (3)

[Claims] An adhesive is applied to a part of one surface of a base material so that the form and the contact area with the object can be changed according to the shape of the object to be dehydrated. Characteristic water-absorbing material. 2. The water-absorbing material according to claim 1, wherein the adhesive is a slightly tacky re-adhesive adhesive. 3. The water-absorbing material according to claim 1, wherein the adhesive is a hot-melt adhesive.