JPS62287865A - Liquid absorbing sheet - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention <Industrial Application Field> The present invention provides a sheet for absorbing liquid extracted from foods with high moisture content such as meat, fresh seafood, and vegetables. It is.

<Prior art> When storing, preserving, and displaying watery foods such as meat, fresh seafood, and vegetables, from these foods;
Use as drip liquid. ) appears.

Drip liquid accumulates at the bottom of containers (trays, etc.) used for storage, producing a bad odor, reducing the shelf life of foods, and deteriorating the appearance, so it must be removed. It is cumbersome to remove drip liquid by replacing the container.
Conventionally, non-woven fabric or other drip-absorbing sheets were placed between the preserved foods or at the bottom of the container, as this would increase storage costs.
A method of removing drip liquid by absorbing it into a nonwoven fabric or the like has been used. In addition, in supermarkets and other stores, small portions of moist foods are stored in small containers and sold; Non-woven fabrics and the like have been used to remove these substances because they can stick to them and stain clothing.

However, non-woven fabrics have a small absorption capacity for drip liquid, and therefore their effectiveness is also insufficient. Therefore, consideration has been given to using superabsorbent resins that have a large absorption capacity. This is a product in which granular super absorbent resin is packaged in a hydrophilic bag made of paper, cloth, non-woven fabric, etc.
), hydrophilic sheets containing super absorbent resin particles, super absorbent resin particles sandwiched between hydrophilic sheets, etc. are placed between preserved foods or at the bottom of containers to absorb drip liquid. This is the way to do it. However, although both methods have a high absorption capacity, resin particles fall off from bags, sheets, etc. and get mixed into food, making it difficult to separate and remove them, which poses food hygiene problems. Although this can be prevented to some extent by using a simple cloth with a large basis weight, the absorption rate and, in turn, the absorption capacity are reduced.

<Problems to be solved by the invention> The present inventors have a large ability to absorb drip liquid, and
The present invention was developed as a result of research into a drip liquid absorbent sheet that does not cause resin particles to fall off and poses no problems in terms of food hygiene.

However, the present invention is a liquid absorbent sheet comprising a super absorbent resin contained in a bag made of paper laminated with a perforated polymer sheet.

The perforated polymer sheet of the present invention is a sheet made of thermoplastic resin and has walls with many small holes. Here, examples of the thermoplastic resin include polyethylene and polypropylene, but polyethylene is preferred.

The diameter of the hole is preferably in the range of 0.11 to 81,000. If it is smaller than IPll, the liquid absorption capacity of the liquid absorbing sheet will be low, while if it is larger than 3 liters, the resin particles in the sheet will flow out when the sheet is used, causing problems with food hygiene.

The paper laminated with the perforated polymer sheet used in the present invention may be any material as long as it is hydrophilic, has the ability to allow water to pass through, and is not soluble in water. Blended paper made of rayon, pulp, polypropylene, etc. can also be used.

The super absorbent resin used in the present invention has a high water capacity and is insoluble in water! It is a particle. Since the object to be applied is food, materials that are likely to spoil, for example, materials containing natural substances such as starch, cannot be used, and products made of pure metal are generally selected first.

Furthermore, (a) it must be stable against heat, ultraviolet rays, oil, acid, etc.

(b) Low toxicity; (c) After water absorption, the absorbed resin (hereinafter referred to as gel) undergoes strong deformation and can maintain its shape even in the water-absorbed state; and) is nearly neutral. Something that satisfies you is desirable.

The shape of the particles is preferably granular or spherical.

Therefore, examples of resins that can be used include saponified vinyl acetate-acrylic acid ester copolymers, salts of cross-linked modified isobutylene-maleic anhydride copolymers, and polyhalic acid (salts) having a cross-linked structure. Salts of saponified vinyl acetate-acrylic acid ester copolymers or cross-linked modified isobutylene-maleic anhydride copolymers are preferably used because of their strong gel properties.

The high-grade aqueous resin preferably has a water absorption capacity of 20 times or more its own weight, more preferably 100 times or more. If the water absorption capacity is lower than this, the absorption capacity of the liquid absorption sheet will decrease. From the viewpoint of absorption capacity, the higher the water absorption capacity of the superabsorbent resin, the more desirable it is, but the gel strength must not be reduced as a result. Therefore, existing vinyl acetate-
In the case of a super absorbent resin made of a saponified acrylic acid ester copolymer, the water absorption capacity is preferably not more than 500 times its own weight, more preferably not more than 500 times its own weight.

The preferred particle size of the superabsorbent resin varies depending on the type of paper used. Rayon with a weight of 20 Q/rs.
When synthetic pulp/polypropylene mixed paper is used, those having a particle size of 20 to 300 μm are often used.

In the present invention, there is no particular restriction on the method of storing the high-level aqueous resin in a bag made of laminated paper.

For example, a method may be used in which laminated paper is set in a machine, and while the bag is being made, the contents such as super absorbent wood 113 are added thereto, and the bag is closed by heat sealing.

In the present invention, the super absorbent resin contained in the bag includes:
Inorganic water absorbing agents, rice hulls, activated alumina, bamboo, birch, charcoal, silicon dioxide, etc. can be added. It is preferable that the additive does not cause a chemical reaction, is approved as a food additive, and is preferably white for aesthetic reasons.

In particular, the addition of an inorganic water-absorbing agent such as silica gel is preferable because it prevents the superabsorbent resin from clumping together during water absorption, which prevents the water absorption rate from decreasing due to so-called uncoiling. The preferred amount of silica gel to be added varies depending on the type and particle size of the superabsorbent resin, but it usually needs to be added in an amount of 0.1% by weight or more based on the superabsorbent resin. It is also useful to add activated carbon, natural zeolite, etc. for the purpose of deodorization.

<Example> While making a bag by setting paper laminated with perforated polyethylene to a thickness of 20 μm in a machine as shown in Table 1, at the same time, a predetermined sumikage (highly absorbent resin manufactured by Sumitomo Chemical Industries, Ltd.)
．． 5-9 was added and the bag was closed by heat sealing (four-sided sealing) to make a liquid absorbent sheet with a size of 6 x 8 (7). At the same time, as a comparative example, a liquid absorbent sheet was made in the same manner using non-laminated paper (ζ) instead of laminated paper.

Using these liquid-absorbing sheets, we investigated liquid-absorbing relationships and resin leakage.

(1) Measurement of liquid absorption rate The dried liquid-absorbing sheets shown in Table 1 were immersed in pure water, allowed to absorb water, and changes in Mffi of the liquid-absorbing sheets were measured.

The results are shown in Figure 1.

(2) Measurement of resin leakage Put 1% saline solution in a 2t beaker and heat it in it.Table-1
Soak a liquid-absorbing sheet and allow it to absorb enough water.

Thereafter, the absorbent sheet, which has absorbed water and swelled, is picked up with tweezers and shaken vigorously in water.

Evaporate the water in the beaker using an evaporator 10
When the condensed liquid was visually observed after being concentrated to 1/0, no resin particles were observed in the concentrated liquid when the liquid absorbent sheets of Examples 1 to 7 were used, but in Comparative Example 1, no resin particles were observed in the concentrated liquid. When using the liquid absorbent sheet, resin particles were observed.

Effect The liquid-absorbing sheet of the present invention exhibits good liquid-absorbing performance.

That is, as shown in the examples, the liquid absorbing performance is equivalent to that of a conventional single-liquid sheet made of a bag made of non-laminated paper and containing a super absorbent resin. Moreover, unlike these liquid-absorbing sheets, almost no superabsorbent resin particles are observed to fall off, and therefore there are no food hygiene problems.

Therefore, the liquid-absorbing sheet of the present invention can be placed at an appropriate position in the food, such as between stored foods or at the bottom of a container, and used to absorb drip liquid, resulting in improved storage stability and odor of the food. It can contribute to prevention of occurrence.

And it is not only used for absorbing drip liquid from food.
It can also be used as blood-sucking cloth, underlay for pet breeding boxes, etc.

\1, Figure-1 3510 minutes Time 9 Weight after water absorption Model amount before water absorption Procedure amendment (method) % formula % 2. Name of the invention Liquid absorption sheet 3. Person making the amendment Relationship to the case Patent applicant Higashi Ward, Osaka City 5-15 Kitahama (209) Sumitomo Chemical Co., Ltd. Representative Hideo Mori (and one other person) 4. Agent 5-15 Kitahama, Higashi-ku, Osaka A brief explanation of the documents attached to the application and the drawings in the specification 7. ? m
Correct details (1) Submit a document certifying the authority of representation as shown in the attached sheet.

(2) The following section for a brief explanation of the drawings will be added after the table on page 11 of the specification.

[Brief explanation of the drawing]

Figure 1 shows the dry absorbent sheet shown in Table 1 immersed in pure water.
It represents the change in the ratio of weight after water absorption/weight before water absorption of the liquid absorbent sheet over time when water is absorbed. "that's all

Claims (2)

[Claims] (1) A liquid-absorbing sheet made by storing a super absorbent resin in a bag made of paper laminated with a perforated polymer sheet. (2) The liquid-absorbing sheet according to claim 1, wherein the super-absorbent resin is granular or spherical.