JP2815384B2 - Water absorbing sheet with functionality - Google Patents

Description

The present invention relates to a functional water-absorbent sheet, and more particularly to a material for keeping freshness of fresh food, sanitary products, diapers, disposable rags, paper towels and the like. The present invention relates to a water-absorbing sheet having various functions useful as a material of a product requiring water absorption.

[Conventional technology]

BACKGROUND ART Conventionally, super-water-absorbing resins have been widely used as materials for freshness-keeping materials for fresh foods, sanitary products, diapers, disposable rags, paper towels and the like.

Conventionally, various measures have been taken to maintain the freshness of fresh foods, but in particular, free water leaching from fresh foods such as meat, fish and shellfish significantly reduces the freshness of the foods. Therefore, immediate removal of free water is an important factor indispensable for maintaining freshness.

Conventionally, as a countermeasure against the free water, there is known as a prior art a method in which a water-absorbent sheet using a superabsorbent polymer material is placed in a packaging form of fresh food to absorb and remove free water.

For fruits and vegetables such as fruits and vegetables,
Freshness is reduced due to ethylene gas generated from fruits and vegetables or condensation of water vapor due to respiratory action in a sealed state such as bagging or similar state.

Conventionally, in order to prevent such a decrease in freshness of fruits and vegetables, for example, during the transportation of fruits and vegetables packed in a box or bag with two types of freshness retaining materials such as a water-absorbent sheet using a highly water-absorbent resin and an ethylene gas adsorbent. Methods for storing are known.

Other water-absorbent sheet products used for various applications include, for example, those having a structure in which a highly water-absorbent resin powder is sandwiched between two sheet base materials, at least one of which is water-permeable, Along with providing a patterned water-absorbing layer with a coating agent containing a water-absorbent resin, various forms are known, such as those in which an adhesive is formed on the non-patterned portion and another sheet substrate is bonded. I have.

[Problems to be solved by the invention]

However, in the case of the above-mentioned conventional technology, for example, when packaging fruits and vegetables, it is necessary to separately store two types of materials, a water-absorbing sheet and an ethylene gas adsorbent, in a packaging form, and a large amount of fresh food In the case of packaging processing, there are various problems such as extra time and labor, a reduction in overall work efficiency, and an increase in cost.

Furthermore, during transportation, the sachet containing the ethylene gas adsorbent is damaged, and the ethylene gas adsorbent inside adheres to the surface of the fruits and vegetables, thereby deteriorating the appearance of the product. There was a risk of contamination.

And, the packaging body for ordinary fresh food uses ordinary packaging materials, and the packaging materials themselves include:
For example, since there is no specific function such as antibacterial property, it is impossible to reliably prevent freshness deterioration of fresh food caused by contamination by food deteriorating bacteria with the water absorbing sheet alone, and establish effective measures Was desired.

In addition, animal foods such as meat and fish and shellfish are generally stored and distributed in refrigerated conditions.At this time, the food may cause a distinctive smell other than drip from the tissue and cause a significant decrease in commercial value. Had become. In particular, once frozen and thawed, the tissue itself is destroyed, so the odor is remarkably generated, and an effective measure for preventing or removing the odor has been desired.

Products other than the above fresh food, such as sanitary products, diapers,
Even for products that require high water absorption, such as disposable rags and paper towels, effective measures are still not sufficient in terms of prevention of bacterial contamination and deodorization in addition to water absorption.
There has been a demand for the development of new products having functions that can solve them in addition to water absorption.

Under such circumstances, the present inventors have conducted intensive studies to solve the above-mentioned problems of the prior art, and as a result, combining a highly water-absorbing material and an antibacterial material, have both water absorbing and antibacterial properties. It has been found that the above problems can be solved by configuring the water absorbing sheet described above, and the present invention has been completed.

That is, an object of the present invention is to provide a water-absorbing sheet having high water-absorbing properties and antibacterial properties, and having a useful function as a material for maintaining freshness of fresh food.

[Means for solving the problem]

The configuration of the present invention adopted to achieve such an object is to sandwich and integrate a mixture of a superabsorbent polymer material and an antibacterial material between specific packaging materials to constitute a water-absorbing sheet. This is a characteristic, and is specifically as follows.

(1) A mixture containing at least a superabsorbent material and an antibacterial material was prepared by using an inner layer of paper and an outer layer of nonwoven fabric, respectively.
A water-absorbent sheet having functionality, characterized in that the whole is sandwiched and integrated between a first packaging material and a second packaging material made of a laminate of layers by a heated embossing roll.

(2) The functional water-absorbent sheet according to the above (1), wherein the mixture contains a material having a deodorizing property or an ethylene gas adsorbing property.

(3) The functional water-absorbent sheet according to (1), wherein the mixture is sandwiched and integrated between the first packaging material and the second packaging material together with a binder made of a thermoplastic resin.

Subsequently, the present invention will be described in more detail. Figure 1
BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows one Example of this invention, The laminated body of two layers which used paper as the inner layer and nonwoven fabric as the outer layer is used as a packaging material.

That is, a mixture containing a high-absorbency polymer material and a specific functional material is sandwiched between papers 2 and 4, and
Or, they are integrated by being sandwiched between two. Nonwoven fabrics 1 and 5
Is a non-woven fabric of a thermoplastic resin, part or all of which is, for example, a non-woven fabric obtained by impregnating or mixing a resin such as polyolefin, polyester, or polyamide with a fiber such as rayon or pulp, or a fiber such as polyolefin, polyester, or polyamide. A nonwoven fabric made of a material having a basis weight of 15 to 100 g / m ² is preferable.

The papers 2 and 4 are made of laminated soft paper such as tissue paper having a basis weight of 15 to 60 g / m ² , but are not particularly limited.

Among the mixture of the superabsorbent polymer material and the antibacterial material sandwiched between paper and paper and other various functional materials as required, other various functional materials include a deodorant, ethylene A substance or a composition having an appropriate function such as a gas absorbent or an appropriate composite function combining these functions is used.

Antibacterial agents include antibacterial metal materials such as silver, copper, zinc, tin, lead, bismuth, cadmium, chromium, and mercury, zeolite, activated carbon, silica, activated clay, acid clay, alumina, activated bauxite, and bone charcoal. And those supported on a carrier such as molecular sieve, but the antibacterial material, the type of the carrier and the amount used thereof are not particularly limited.

 The following are illustrated as a deodorant.

(1) Physical adsorption deodorant Neutral activated carbon, fibrous carbon adsorbent, zeolite, activated alumina, acid clay, etc.

(2) Chemical deodorants Acidic, alkaline, oxidizing, and reducing agents.

(3) Physical and chemical deodorants Alkaline or acidic impregnated activated carbon, zeolites adsorbing vegetable essential oils, etc.

(4) Others Iron phthalocyanine derivatives, salts having a desulfurizing action such as zinc oxide, and mixtures of iron (II) compounds with L-ascorbic acid and alum.

Any deodorant other than these deodorants may be used, and a mixture of one or more of these deodorants can be used. These deodorants are 1m in sheet
It is preferable to mix with the superabsorbent polymer material and sandwich between the packaging materials so as to sandwich in the range of 0.1 to 150 g per ² .

As an ethylene gas adsorbent, a carbonaceous molecular sieve adsorbing bromine, preferably one having a micropore of 4 to 6 °, or an acidic water in which sodium or potassium bromate is dissolved is added to activated carbon and reacted. Dried and pulverized particles having a particle size of 5 to 500 μm are exemplified. Such an ethylene gas adsorbent is desirable because it is not affected by moisture, that is, does not release adsorbed ethylene gas in the presence of moisture. Activated carbon, zeolite, Oyaishi, and the like, which are generally used as ethylene gas adsorbents, are not desirable because moisture releases the adsorbed ethylene gas.

In addition to these functional materials, it is possible to use a material having an appropriate function, and the type is not particularly limited.

Examples of the superabsorbent polymer material used in the present invention include a graft polymer of starch / acrylate, a cross-linked carboxymethyl cellulose, a vinyl alcohol / acrylate copolymer, a polyacrylonitrile hydrolyzate, and a cross-linked polyacrylate. And highly water-absorbing resins such as modified polyvinyl alcohol, acrylic acid polymer, acrylate / acrylamide copolymer, and isobutylene / maleic anhydride copolymer. It is also possible to use two or more of these superabsorbent polymer materials.
The amount of superabsorbent polymer material, the sheet 1 m ² per 0.1
A range of 200 mg is preferred, and a range of 1 to 50 g is particularly desirable.

In order to sandwich and integrate the superabsorbent polymer material and various functional materials between the packaging materials, a binder such as a thermoplastic resin such as polyolefin, polyamide, or polyester can be used.

The following method can be used to produce the water-absorbing sheet having the functionality of the present invention using the above materials.

(1) A mixture 3 of a superabsorbent polymer material, a specific functional material and a binder is evenly sprayed on the paper 4 in FIG. 1, and the paper 2 is overlaid thereon. It is clamped and integrated by a pressure clamping method. produced
Cut 2,3,4 laminates to a certain size
It is put in the pouch created in steps 1 and 5, and the opening is heat-sealed.

(2) A mixture of a superabsorbent polymer material, a functional material and a binder is evenly sprayed on the paper 4 in FIG. 1, and the paper 2 is further stacked, and the nonwoven fabrics 1 and 5 are further stacked. It is manufactured by clamping and integrating by a pressure clamping method.

The hot-pressing sandwiching method includes: (1) between a heated embossing roll and a heated embossing roll; (2) between a heated embossed roll and a heated roll; Method.

The water-absorbing sheet having the functionality of the present invention is generally used as it is as a material for maintaining freshness of fresh food, for example, as it is inserted between fresh foods in boxing, bagging, tray packaging, and the like of the fresh foods. As a matter of course, it is also possible to use a food which is easy to dry, having water absorbed in the freshness preserving material in advance and making it wet.

In addition, it is also possible to process the material into an appropriate form and use it as a material for sanitary products, diapers, disposable rags, paper towels and the like.

〔The invention's effect〕

As described above, the use of the water-absorbing sheet having the functionality of the present invention has an advantage that freshness of fresh food can be maintained easily and at low cost without labor.
In addition, since the antibacterial material is integrated with the superabsorbent polymer material, there is a danger that the functional material such as the antibacterial material and other ethylene gas adsorbents will contaminate the fresh food due to breakage of the bag. It has unique effects such as not being present at all.

Furthermore, together with the highly water-absorbing material, there is an advantage that a water-absorbing sheet having any function according to the purpose of use can be produced by simply selecting and mixing a specific functional material as appropriate, and its industrial utility value is It is extremely expensive.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a freshness preserving agent according to one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... Nonwoven fabric 2 ... Paper 3 ... Mixture of superabsorbent polymer material and functional material (deodorant) 4 ... Paper 5 ... Nonwoven fabric

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI B32B 27/18 B65D 81/26 H A61F 13/18 307E B65D 81/26 380Z A41B 13/02 D (56) References JP JP-A-1-2441 (JP, A) JP-A-1-24738 (JP, A) JP-A-1-85271 (JP, U) JP-A-59-30876 (JP, U) JP-A-61-175189 (JP, A) U) (58) Fields investigated (Int.Cl. ⁶ , DB name) B32B 1/00-35/00 B01J 20/00-20/34 B65D 81/00-81/38 A61F 13/18 A41B 13/02

Claims (3)

(57) [Claims] A mixture containing at least a superabsorbent material and an antibacterial material is mixed between a first packaging material and a second packaging material each comprising a two-layer laminate in which an inner layer is paper and an outer layer is nonwoven fabric. A water absorbing sheet having functionality, the whole being sandwiched and integrated by a heated embossing roll. 2. The functional water-absorbing sheet according to claim 1, wherein the mixture contains a material having a deodorizing property or an ethylene gas adsorbing property. 3. The functionality according to claim 1, wherein the mixture is sandwiched and integrated between the first packaging material and the second packaging material together with a binder made of a thermoplastic resin. Water absorbing sheet.