JP2916577B2 - Liquid absorbing sheet and method of storing food - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for absorbing and removing drips leached from foods that cause drips such as meat and fish from the food surface and not drying the food itself by not actively absorbing the moisture in the food. The present invention relates to a liquid-absorbing sheet that can prevent discoloration and quality deterioration of food for a long period of time, and a method for storing food using the liquid-absorbing sheet.

[0002]

2. Description of the Related Art Meat juice called drip is leached when food such as meat or fish is vacuum-packaged in a non-breathable film and stored in a chilled temperature range, or when thawed after being frozen and stored. This drip accumulates between these foods and the non-breathable film, deteriorating the quality, such as discoloring the foods that have been in contact with them for a long time, significantly impairing the commercial value, and removing the discolored parts will increase the yield of the foods. Will decrease. Further, the drip serves as a breeding ground for breeding of bacteria, thereby shortening the shelf life of the food.

[0003] Therefore, a method for removing drip from packaged and stored food has been studied. In this method, food is generally packaged in a state in which the food is brought into contact with a sheet-like liquid-absorbing material, and drip leached out as needed during storage is absorbed by the liquid-absorbing material to remove the drip. As the liquid absorbing material, a capillary liquid absorbing material such as paper pulp which has a hydrophilic surface and can absorb and hold a drip by a capillary phenomenon, a so-called polymer water absorbing agent, or a composite thereof is used. However, these capillaries have low strength as sheet materials,
The polymer water-absorbing agent is generally in the form of powder or broken granules,
There is a problem with bringing them directly into contact with food,
Cover the outer surface with a liquid-permeable film such as a nonwoven fabric, or
A liquid-permeable film is partially used, and the other surface is covered with a non-water-permeable film such as a plastic film to be used as a liquid-absorbing sheet (for example, Japanese Patent Publication No. 1-123939, 6).
No. 53226).

[0004]

This liquid-absorbing sheet covers most of the food or is placed on the bottom of the food, even when the food is vacuum-packaged with a non-breathable film and chilled and transported. . This means that even if the food is vacuum-packed with a non-breathable film, the drip leached from the food will
This is because they move due to vibration or gravity during transportation and accumulate at the bottom of the package or in the recess of the food. This is because the drip is absorbed and removed in the liquid absorbing sheet so that the food does not come into contact with the drip.

[0005] However, at least a part of the outer surface of the liquid absorbing sheet is formed of a liquid-permeable film, and when the food and the liquid-permeable film are brought into contact with each other, the liquid is leached from the food between the non-permeable film. In addition to the drip, the surface in which the liquid-absorbing sheet and the food are in contact with each other actively absorbs moisture in the food to dry the food, deteriorating the quality, and failing to achieve the purpose as a packaging material.

When a part of the liquid-absorbing sheet is a liquid-impermeable film and the food is brought into contact with the liquid-impermeable film of the liquid-absorbing sheet (for example, Japanese Patent Publication No. 5-83214), The drip cannot be absorbed by the contact surface, especially when it is on the concave part or the bottom of the food, and the drip and the food come into contact for a long period of time. Absorption removal cannot be fully achieved.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is therefore an object of the present invention to absorb only drip leached from food such as meat or fish. By not actively absorbing moisture from the food, it does not dry the food itself, and also absorbs and removes drip that oozes out and accumulates at the bottom, recesses, etc. of the food in contact with the liquid-absorbent sheet. It is an object of the present invention to provide a liquid-absorbing sheet that can prevent discoloration and deterioration of the food and decrease the quality thereof over a period of time and maintain a yield, and a method for storing food using the liquid-absorbing sheet.

[0008]

SUMMARY OF THE INVENTION The above-mentioned problem is solved by polymer adsorption.
A liquid- absorbing sheet containing a sheet-like liquid - absorbing material in which a collecting agent and a wetting agent are sandwiched by a capillary liquid- absorbing material , wherein one of the liquid- absorbing sheets is
The outer surface is a liquid permeable film, the other outer surface consists HanTorueki film, the HanTorueki film is, which apertures are formed in the liquid-impervious film, the apertures The problem can be solved by providing a liquid-absorbent sheet having a pore diameter in the range of 0.05 mm to 0.5 mm and a porosity in the range of 0.01% to 0.4%.

[0009] The present invention also provides a method for preserving food, wherein the food is brought into contact with the surface of the semi-permeable film of the liquid-absorbent sheet, and is vacuum-packaged with an impermeable film for preservation.

The semi-permeable film used for the liquid-absorbing sheet of the present invention does not allow water to pass at all (liquid-impermeable), but allows a small amount of water to pass through in a restricted state. Is a liquid-impervious film acceptable for food packaging in which a specific opening according to the present invention is formed.

Examples of the liquid-impermeable film that can be used include, for example, a polyethylene film, a polypropylene film, a polyvinylidene chloride film, a PET film, a moisture-proof cellophane or a polyethylene laminated aluminum foil. Above all, polyethylene film or polypropylene film does not contain substances that may contaminate food, does not generate, does not itself have water absorption or permeability, is flexible,
It is particularly preferable because it has good releasability from the pressed food and is inexpensive.

The diameter d of the opening of the semi-liquid permeable film is 0.0
5 mm to 0.5 mm, preferably 0.1 m
m to 0.3 mm, and its porosity P
Within the range of 0.01% to 0.4%, preferably 0.0%
It is formed to be in the range of 1% to 0.2%. Preferably, the openings are uniformly distributed throughout the semi-liquid permeable film. The shape of the opening is not particularly limited as long as it is within the range of the above-mentioned hole diameter and opening ratio. Here, the aperture ratio P is (total area of apertures /
% Value expressed by the total area of the semi-liquid permeable film) × 100, and when the area s of each opening is the same, (opening area s per opening s × opening number n × 100) ) / (Total area of semi-liquid permeable film 6).

In the liquid absorbing sheet of the present invention, it is preferable that food is brought into contact with the surface of the semi-liquid permeable film, and the package is stored in a non-breathable film by vacuum packaging. Therefore, the opening is to introduce a drip leaching from the food in contact with the semi-permeable film into the inside of the liquid absorbing sheet through the opening, and the hole diameter d is 0.05 to 0.5 mm. It was found to be effective within the range.

As a result of the experiment, if the hole diameter d was less than 0.05 mm, the drip could not pass through the opening and remained on the semi-permeable film, and the drip and meat were in contact for a long time. The meat contact surface turns black. When the pore diameter d exceeds 0.5 mm, the drip and the moisture in the meat are absorbed through the perforated portion of the meat surface in contact with the perforated portion of the semi-permeable film, and only that portion is absorbed. Blackening that seems to be the concentration of the pigment occurs, and the meat surface becomes speckled.However, when the opening ratio is increased, the interval between the holes becomes narrower, so that the moisture and the pigment are entirely absorbed by the liquid absorbing sheet and the meat is The surface is generally less carnivorous. In any case, it turned out to be inconvenient. Therefore, when the diameter of the hole becomes large, the possibility of local discoloration at the hole becomes large, and the stability of the hole diameter in the production causes the drip leaching from the stored food to be quickly absorbed and the food to be absorbed into the food. The optimal range of the pore diameter d that does not absorb the moisture is 0.1 mm to 0.1 mm.
It was found to be in the range of 3 mm.

It has been found that the porosity P is effective within the range of 0.01% to 0.4%. The porosity P is 0.
If it is less than 01%, the gap between the holes is so large that the drip cannot be guided to the liquid absorbing sheet through the holes, so that the drip and the meat come into contact for a long time and the meat surface turns black. However, when the opening diameter becomes large, the moisture of meat around the opening part is absorbed from the hole, and blackening that seems to be the concentration of pigment occurs only in that part,
The meat surface becomes spotted. On the other hand, if the porosity P exceeds 0.4%, the distance between the holes becomes narrower, so that not only drip but also moisture inside the food is absorbed, and the meat surface becomes thinner.
An increase in the aperture ratio means an increase in the aperture area and an increase in the amount of water absorbed by the liquid-absorbing sheet. Therefore, the range of the optimal aperture ratio P is 0.0 from the viewpoint of increasing the yield.
It was found to be in the range of 1% to 0.2%.

The semi-permeable film of the present invention can be produced by forming holes in the above-described liquid-impermeable film by known mechanical or electrical means or laser.

The liquid-permeable film used for the liquid-absorbing sheet of the present invention has water permeability and water resistance, and has a density (pore diameter) of such a level that does not leak a liquid-absorbing material, especially a powdery polymer water-absorbing agent. Any generally available material may be used as long as it is preferably heat-sealable and acceptable for food packaging. For example, it may be formed from any of the group consisting of woven fabric, knitted fabric, and nonwoven fabric or a laminate thereof, and may be a liquid-impermeable film such as a polyethylene film, a polypropylene film, or a PET film.
It may be a film or a material in which fine communication holes are formed in a moisture-proof cellophane or the like by known mechanical or electrical means or a laser, or a communication hole foamed polyethylene sheet or mesh sheet.

The liquid-permeable film of the present invention is so-called water-permeable, generally has a porosity of 1% or more, and is clearly distinguished from the above-mentioned semi-liquid-permeable film. This liquid-permeable film is used to quickly permeate and absorb the drip that has leached from the surface of the food that the liquid-absorbing sheet is not in contact with and moved to the water-absorbing sheet due to vibration, gravity, etc. during transportation. Can be

It is preferable that both the semi-liquid permeable film and the liquid permeable film are heat-sealing and form one surface of each of the liquid-absorbing sheets. By heat sealing the peripheral portions of both films, delamination of the liquid absorbing sheet can be prevented, and leakage of the built-in liquid absorbing material can be prevented.

The liquid absorbing material is used for absorbing and retaining the drip leached from the food, and may be any material that does not adversely affect the human body when storing the food.

It is preferable that the liquid absorbing material contains a polymer water absorbing agent. As the polymer water-absorbing agent used as the liquid-absorbing material, any known polymer-absorbing agent may be used as long as it has a drip absorbing ability and is acceptable in terms of safety. These are generally three-dimensionally cross-linked water-soluble polymers, and many types are known. Preferred polymer water-absorbing agents are polysaccharides such as starch and cellulose, acrylic acid, methacrylic acid, acrylate, methacrylate, acrylate, methacrylate,
Acrylic amide, methacrylic amide, acritonitrile, methacrylonitrile, maleic acid, sulfonated styrene, polyvinyl pyridine or any one or more of the group consisting of oligomers or co-oligomers thereof is graft-polymerized or graft-polymerized. Cross-linked product of the polymer obtained by hydrolysis on the substrate, polyethylene oxide, polypropylene oxide, polyvinylpyrrolidone, sulfonated polyethylene, polyvinylpyridine,
Any one or more crosslinking products of the group consisting of polyacrylates, polymethacrylates, polyacrylamides, and polymethacrylamides, vinyl acetate-acrylate copolymers, isobutylene-maleic anhydride copolymers Products, polyvinyl alcohol-maleic acid copolymers, cross-linked carboxymethyl cellulose, and the like. Examples of commercially available polymer water-absorbing agents used in the liquid absorbing sheet of the present invention include PX-
402A (Showa Denko KK), Sunwet IM-
300 (manufactured by Sanyo Chemical Industries, Ltd.), Aqua Keep 10
SH (manufactured by Iron and Steel Chemical Industry Co., Ltd.), Aquaric CA
(Manufactured by Nippon Shokubai Chemical Industry Co., Ltd.).

It is preferable that the above-mentioned liquid-absorbing material is one in which the above-mentioned polymer water-absorbing agent is sandwiched between capillary liquid-absorbing materials which absorb liquid by capillary action. Capillary liquid absorbing material is a sheet-like formed material capable of absorbing drip or moisture by capillary action and holding them, and the polymer water absorbing agent,
More preferably, it retains a wetting agent described below.
Examples include paper, pulp, pulp sheets made from pulp, absorbent cotton, gauze, woven fabric, knitted fabric, non-woven fabric,
Examples include sponge, communicating hole polyurethane foam, communicating hole viscose foam, and communicating hole vinylon foam.

The polymer water-absorbing agent is generally in the form of powder or granules when dried.
The two-layer capillary absorbent may be spread and sandwiched between the layers, or may be inserted into the communication hole of the one-layer capillary absorbent and sandwiched. In addition, commercially available products in which a polymer water-absorbing agent is sandwiched between capillary absorbent materials, such as disposable diapers, sanitary treatment products,
A highly water-absorbing sheet used in the field of a soil conditioner or the like can also be used as a liquid absorbing material.

The polymer water-absorbing agent irreversibly introduces a large amount of drip or moisture introduced through the openings of the semi-permeable film or the fine communication holes of the liquid-permeable film and passed through the layer of the capillary absorbent. And does not flow backward even when pressure or impact is applied from the outside.

The liquid absorbing material of the present invention preferably contains a wetting agent. Generally, a polymer absorbent is hard when dried, and may damage an exterior film or a non-breathable film for vacuum packaging due to friction or the like. The wetting agent keeps it soft even when dry, thus preventing this damage and reducing the pinhole rate of a non-breathable film for vacuum packaging, for example. In addition, when the above-mentioned capillary liquid absorbing material has a hydrophobic surface, the initial water absorption is generally poor. In this case, if the hydrophobic surface is covered with wettability, the initial water absorption becomes good, and the drip or moisture introduced from the opening of the semi-permeable film or the fine communication hole of the liquid-permeable film is promptly removed. Can be absorbed. The amount of wetting agent used makes the absorbent material soft,
There is no particular limitation as long as it does not substantially leak even under pressure. The appropriate amount is experimentally determined in consideration of the material and configuration of the liquid absorbing material used, the total area of the capillary wall, and the like.

Examples of the wetting agent include polyhydric alcohols such as ethylene glycol, propylene glycol, diethylene glycol monoethyl ether, 1,3-butylene glycol and glycerin, and polyhydric alcohols such as polyethylene glycol, polypropylene glycol and polyglycerin. Examples thereof include alcohol polymers, sugar alcohols such as xylitol, sorbitol, and maltitol, methyl cellulose, carboxymethyl cellulose, and the like. These are used in the form of an aqueous solution as required. Glycerin is particularly preferred from the viewpoint of wettability and safety.

Examples of foods to which the present invention can be applied include various foods such as partially cut meat such as beef and pork and chicken, and partially cut meat such as tuna, bonito, and salmon. Can be.

[0028]

A liquid-absorbent sheet having a semi-permeable film having an opening having the above-mentioned opening diameter and porosity is brought into contact with food so that the semi-permeable film surface is in contact with the non-permeable film. If the product is vacuum-packed and stored, drip that leaches from the food during storage, and leaches from the part that is not in contact with the absorbent sheet, moves between the food and the non-breathable film due to vibration or weight. Then, the liquid is absorbed and removed from the liquid-permeable film surface of the liquid-absorbing sheet disposed at the bottom or at a portion including the bottom. In addition, the drip that oozes from the surface of the food in contact with the liquid absorbing sheet is absorbed by the liquid absorbing material through the opening in the semi-liquid permeable film surface. Furthermore, if the absorbent sheet is in contact with the concave portion of the food where the drip easily enters and accumulates, the drip that enters or oozes out is absorbed by the absorbent material through the opening in the semi-permeable film surface. There is no long-term contact between food and drip.

On the other hand, the moisture in the food may be such that the semi-liquid-permeable film surface of the water-absorbent sheet having the semi-liquid-permeable film in which the openings having the above-mentioned opening diameters and porosity are formed faces the food. If the food is not positively absorbed by the liquid absorbing material, quality deterioration and discoloration due to drying of the food do not occur. If the built-in liquid-absorbing material contains a polymer water-absorbing agent, the drip once absorbed will not be released even when pressurized, and will flow back to the food side even if subjected to pressure shock during storage and transportation Nothing. The absorbent material is softened by including a wetting agent,
The pinhole ratio of the non-breathable film in vacuum packaging is reduced.

Next, the present invention will be described with reference to the drawings. FIG. 1 shows a preferred specific example of the liquid absorbing sheet of the present invention. In this specific example, the liquid absorbing sheet 1 contains a liquid absorbing material 4 for absorbing a drip of food, and one of its outer surfaces is made of a liquid-permeable film 5 and the other is made of a semi-liquid-permeable film 6. . The semi-permeable film 6 has an opening d formed in a liquid-impermeable film, preferably a polyethylene film or a polypropylene film, and the opening d has a specific pore diameter and a specific opening ratio according to the present invention.

As shown in FIG. 2, the liquid absorbing material 4 is preferably formed in a sheet shape by sandwiching the polymer water absorbing material 2 between the capillary liquid absorbing materials 3 and 3. Further, as shown in FIG. The liquid material 4 preferably contains a wetting agent. Both the semi-liquid permeable film 6 and the liquid permeable film 5 have heat sealing properties, and it is preferable to heat seal the peripheral portions of both films.

Using the liquid absorbing sheet 1 of the present invention, meat, fish,
In order to store food such as fish meat, preferably, the surface of the semi-permeable film 6 of the liquid absorbing sheet is directed upward, and the food is brought into contact with this surface, and the food is placed on the bottom of the food during transportation or storage. It is arranged so that at least a part of the liquid absorbing sheet is present, and is vacuum-packaged with a non-breathable film. The non-breathable film used at this time may be a non-breathable film, a shrink film, or the like generally used for vacuum packaging of food. In addition, the degree of vacuum at this time may be any value as long as the food is in close contact with the liquid-absorbent sheet 1 of the present invention and the impermeable film.

If drip leaches from food during storage,
This drip is absorbed into the inside of the liquid absorbing sheet 1 from the opening 7 of the semi-liquid permeable film 6, temporarily held by the capillary liquid absorbing material 3 and irreversibly absorbed and held by the polymer water absorbing agent 2. .

The drip leached from the surface of the food that is not in contact with the liquid absorbing sheet 1 wraps around to the back side of the liquid absorbing sheet 1 and is quickly absorbed from the liquid permeable film 5 and remains on the surface of the food. Absent. The drip leaching from the food surface in contact with the semi-permeable film 6 is absorbed into the liquid absorbing sheet 1 through the opening 7 of the semi-permeable film 6. Therefore, if the liquid absorbing sheet 1 is in contact, the drip does not accumulate in the concave portion on the food surface.

[0035]

EXAMPLES Specific examples of the liquid-absorbing sheet of the present invention and examples for confirming its effects will be described below.

Example 1 Liquid Absorbent Sheet Samples: Several kinds of liquid absorbent sheet samples having the structure shown in FIG. 1 were prepared. That is,
A pulp sheet having a thickness of 10 mm and a thickness of 400 g / m ² was used as the liquid absorbing material 4, and a polypropylene nonwoven fabric was laminated as the liquid permeable film 5 on one surface. On the other surface of the liquid absorbing material 4, a polyethylene film (TUX-HC30, manufactured by Tokyo Cellophane Paper Co., Ltd.) having a pore diameter of 0.04 mm to 1.0 mm and a porosity of 0.
Each of the liquid-absorbent sheet samples was formed by laminating those having circular openings 7 formed in various ways in the range of 008% to 0.60%.

Food sample: domestic cattle (Holstein), parts: sirloin (about 7 kg), peach (about 10 kg). Domestic pig, part; loin (about 5 kg). Storage test: Each food sample was brought into contact with the surface of the semi-permeable film 6 of each liquid-absorbent sheet sample, vacuum-packaged and refrigerated for 10 days, then opened, and the food on the contact surface with the liquid-absorbent sheet sample was opened. The sample was observed for the presence or absence of drip, and for the presence or absence of flesh color change compared to the non-contact surface. In foods, the pigment in the food moves with the movement of water, so that the movement of water in the food can be estimated by the color of the food. Table 1 shows the test results.

[0038]

[Table 1]

From the results shown in Table 1, when the opening diameter is 0.04 mm or less, the drip at the contact surface between the liquid absorbing sheet and the meat surface cannot be guided to the liquid absorbing sheet through the hole, and therefore, the drip is formed between the liquid absorbing sheet and the meat. Remains, so that the drip contacts the meat surface for a long time, and the meat surface turns black. In addition, when the opening diameter is 0.60 mm or more, the pore diameter is too large, and the moisture in the meat portion that has been in contact with the opening portion is absorbed by the liquid absorbing sheet together with the drip, so that the concentration of the dye occurs in the opening portion. , The meat surface turns into spots. However, as the hole opening ratio increases, the gap between the holes becomes narrower, so that the drip and moisture are absorbed by the liquid absorbing sheet from the entire contacting meat surface, so that the color of the meat surface is generally lighter. Become.

When the opening ratio is 0.008% or less, the gap between the holes becomes large, so that the drip cannot be guided to the liquid absorbing sheet through the opening, so that the drip remains and is discolored black due to long-term contact with the meat. . However, when the pores become large, the pores and the peripheral portion of the pores locally absorb the drip and the moisture of the food into the liquid absorbing sheet, so that the meat surface of the pores becomes black and spotted due to concentration of the pigment. In addition, the opening ratio is 0.5%.
As a result, the distance between the holes becomes narrower, and the moisture in the food is more absorbed by the liquid absorbing sheet together with the drip, and the pigment moves together with the moisture of the meat, so that the meat is thinner. However, if the pores are large, local absorption is strong, so that concentration occurs and the color of the pores changes to black spots.

Therefore, the diameter of the opening 7 is in the range of 0.05 mm to 0.5 mm, and the opening ratio is 0.01%.
When a liquid-absorbent sheet sample within the range of 0.4% or less is used, no drip is left on the food surface and there is no discoloration of the flesh color, so that there is no movement of moisture from the food to the liquid-absorbent sheet. Turns out.

Example 2 Three types of liquid-absorbing sheet samples were prepared. These are referred to as liquid absorbing sheet samples A, B, and C, respectively. Liquid-absorbent sheet sample A: a liquid-absorbent sheet having the structure shown in FIG.
mm and an aperture ratio of 0.1% were used. Liquid Absorbent Sheet Sample B: In the liquid absorbent sheet having the configuration shown in FIG. 1, a liquid impervious film (TUX-HC30 manufactured by Tokyo Cellophane Paper Co., Ltd.) was used without opening in place of the semipermeable film 6. . Liquid-absorbent sheet sample C: In the liquid-absorbent sheet having the structure shown in FIG.
The same polypropylene nonwoven fabric was used.

Food sample: domestic cattle (Holstein), site: sirloin (about 7 kg). Storage test: The food sample was brought into contact with the semi-permeable film surface, liquid-impermeable film surface, or liquid-permeable film surface of each liquid-absorbent sheet sample, vacuum-packaged, refrigerated for 10 days, and then opened. And the state of flesh color change and the presence or absence of drip were observed. Table 2 shows the test results.

[0044]

[Table 2]

From the results shown in Table 2, it is found that when the liquid-absorbing sheet sample A, which is an example of the liquid-absorbing sheet of the present invention, is used, the food can be stored without discoloration, drying, and drip of the food. . On the other hand, in the case of the liquid-absorbent sheet sample B using the liquid-impermeable film at the contact portion with the food, a large amount of drip was observed in the depression on the food surface at the contact portion, and discoloration was observed at the portion. Was. Further, in the case of the liquid-absorbent sheet sample C using a liquid-permeable film in the contact portion with the food, discoloration and discoloration occur not only in the contact portion but also in the food, and the meat becomes slightly dry and is distributed as a product. Was determined to be impossible.

Example 3 Four types of liquid-absorbing sheet samples were prepared. These were respectively subjected to liquid absorbing sheet samples D, E, F,
Called G. The size is 1 for each liquid absorbing sheet sample.
It was set to 0 × 12 cm. Liquid-absorbent sheet sample: a liquid-absorbent sheet having the structure shown in FIG.
A 40 g / m ² pulp sheet was used, and a polyacrylic acid-based superabsorbent polymer (Aqualic CA manufactured by Nippon Shokubai Kagaku Kogyo Co., Ltd.) was uniformly dispersed and sandwiched between the pulp sheets as the polymer water-absorbing agent 2. The liquid-absorbent material 4 is formed as a liquid-absorbent material 4. As shown in Table 3, in the liquid-absorbent sheet sample D, the semi-liquid-permeable film 6 has a hole diameter of the opening 7 of 0.2 mm.
A film having an opening ratio of 0.04% is used. Instead of the liquid-permeable film 5, a liquid-impermeable film (T-Cellophane T
UX-HC30) was used without opening. In the liquid-absorbent sheet sample E, a semi-liquid permeable film 6 having an opening 7 having a hole diameter of 0.2 mm and an opening ratio of 0.04% was used. Was. In the liquid absorbing sheet sample F, a liquid-impermeable film was used instead of the semi-liquid-permeable film 6 without opening, and a polypropylene nonwoven fabric was used as the liquid-permeable film 5. In the liquid absorbing sheet sample G, a nonwoven fabric made of polypropylene was used as the liquid-permeable film instead of the semi-liquid-permeable film 6, and a liquid-impermeable film was used without opening the hole instead of the liquid-permeable film 5.

Food sample: domestic cow (Holstein), site: sirloin (about 7 kg). Storage test: The same food sample was brought into contact with the surface of the film used, which was shown in Table 3 of the liquid-absorbent sheet sample, one by one, and the package was vacuum-packaged with a non-breathable film and refrigerated for 10 days After storage, the container was opened, the amount of drip absorbed by each liquid-absorbent sheet sample was measured, and the presence or absence of drip on the contact surface between each liquid-absorbent sheet sample and meat was observed. Table 4 shows the test results.

[0048]

[Table 3]

[0049]

[Table 4]

From the results in Table 4, comparing the drip absorption of the liquid absorbing sheet samples D and G, D has a drip absorption of about 20% of G, confirming the liquid permeability as a semi-liquid permeable film. Comparing the drip absorption amounts of the liquid absorbing sheet samples E and F, the drip absorbing amount of E using the semi-permeable film is about 20% larger than F, and the drip between the liquid absorbing sheet and the meat surface Is not recognized in E, and the effect of the semi-permeable film can be confirmed from that confirmed in F.

Example 4 A liquid absorbing sheet having the structure shown in FIG. 1 was prepared. That is, the thickness of the liquid absorbing material 4 is 10 mm,
A 400 g / m ² pulp sheet was used, and a polypropylene non-woven fabric was laminated as a liquid permeable film 5 on one surface of the pulp sheet. On the other surface of the liquid absorbing material 4, a polyethylene film (TUX-HC30 manufactured by Tokyo Cellophane Paper Co., Ltd.) was used as a semi-liquid permeable film 6 in a circular shape having a pore diameter of 0.2 mm and an aperture ratio of 0.1%. The liquid-absorbent sheet of Example 4 was obtained by laminating those having the openings 7 formed therein. The surface of the semi-liquid permeable film 6 of the liquid absorbing sheet is used for meat (domestic cattle (Holstein) part;
Sirloin (approximately 7 kg), peach (approximately 10 kg): Domestic pig, part; loin (approximately 5 kg)), in vacuum contact with non-breathable film (Grace's barrier bag), and refrigerated for 10 days It was later opened and the condition of the meat was observed. No discoloration was observed in the meat. Also, no drip was observed at the contact portion between the liquid absorbing sheet and the meat.

(Comparative Examples 1 and 2) As in Example 4, except that the semipermeable liquid film had a pore size of 0.01 m
The liquid-absorbent sheet of Comparative Example 1 was formed by using a material having a circular opening 7 having a m and an opening ratio of 0.01%. As in Example 4, except that the semipermeable liquid film has a pore size of 1.0
The liquid-absorbent sheet of Comparative Example 2 was formed using a circular hole 7 having a diameter of 1.0 mm and a hole ratio of 1.0%. Using Comparative Example 1 or 2, the meat was stored refrigerated as in Example 4, and the state of the meat was observed. In Comparative Example 1, discoloration was observed at the contact portion with the liquid absorbing sheet, and a large amount of drip remained at that portion. In Comparative Example 2, although no drip was observed, a spot-like discoloration corresponding to the opening was observed at the contact portion with the liquid absorbing sheet.

Example 5 A liquid absorbing sheet having the structure shown in FIG. 2 was prepared. That is, pulp sheets each having a thickness of 1.0 mm and 40 g / m ² are used as the capillary liquid absorbing materials 3 and 3, and a polyacrylic acid-based superabsorbent polymer (Nippon Shokubai Kagaku Kogyo Co., Ltd.) (Aqualic CA manufactured by Co., Ltd.) was evenly spread and sandwiched, and a sheet-like laminated material was used as the liquid absorbing material 4. On one surface of the liquid absorbing material 4, a nonwoven fabric made of polypropylene was laminated as a liquid permeable film 5. On the other surface of the liquid absorbing material 4, a polyethylene film (TUX-HC30 manufactured by Tokyo Cellophane Paper Co., Ltd.) was used as a semi-liquid permeable film 6 in a circular shape having a pore diameter of 0.2 mm and an aperture ratio of 0.1%. The liquid-absorbent sheet 1 of Example 5 was obtained by laminating those having the openings 7 formed therein.

A non-breathable film (a barrier made by Grace Co., Ltd.) is used in a state where the surface of the semi-permeable film 6 of the liquid absorbing sheet 1 is brought into contact with meat (domestic cattle (Holstein), part; sirloin (about 7 kg)). The bag was vacuum-packaged and opened for 10 days after refrigerated storage, and the state of the meat was observed. No discoloration was observed in the meat. Also, no drip was observed at the contact portion between the liquid absorbing sheet and the meat. The absorbent sheet 1 after the above test was taken out, and 10 kg / cm ²
When the pressure was applied, no drip spilled out. From this result, it is clear that the use of the polymer water-absorbing agent as the liquid-absorbing material is effective for preventing the backflow of the drip.

Example 6 A liquid absorbing sheet having the structure shown in FIG. 2 was prepared. That is, thin virgin pulp sheets each having a thickness of 1.0 mm and 40 g / m ² are used as the capillary liquid absorbing materials 3 and 3, and a polyacrylic acid-based superabsorbent polymer (Japan) The liquid absorbing material 4 was obtained by uniformly spraying and sandwiching Aquaric CA (manufactured by Catalytic Chemical Industry Co., Ltd.) and laminating in a sheet shape. The liquid absorbing material 4 was impregnated with 10% by weight of a food additive glycerin as a wetting agent.

On one surface of the liquid absorbing material 4 impregnated with the wetting agent, a nonwoven fabric made of polypropylene is laminated as the liquid permeable film 5, and on the other surface, a polyethylene film (Tokyo Cellophane) is formed as the semipermeable liquid film 6. Paper company TUX-HC
The liquid-absorbent sheet 1 of Example 6 was formed by laminating a circular hole 7 having a hole diameter of 0.2 mm and a hole ratio of 0.1% on 30).

In a state where the surface of the semi-permeable film 6 of the liquid absorbing sheet 1 is brought into contact with meat (domestic cattle (Holstein), part; sirloin (about 7 kg)), a non-breathable film (manufactured by Grace Co., Ltd.) After packaging in a vacuum with a barrier bag), 100 pieces of the packaged samples were prepared and refrigerated for 10 days, and the pinhole occurrence rate of the air-impermeable film used for packaging was measured. The pinhole occurrence rate is an important factor in maintaining the freshness of the food in relation to the degree of vacuum during storage. As a result of the measurement, the pinhole occurrence rate was 0%. For comparison, when a test similar to the above was performed without using a wetting agent, the pinhole occurrence rate was 3%. From this result, it is clear that the use of the wetting agent is effective in reducing the pinhole occurrence rate of the packaging material.

[0058]

The liquid-absorbent sheet of the present invention contains a liquid-absorbent material and has an outer surface having a hole diameter of 0.05 mm to 0.5 mm.
mm, the porosity is in the range of 0.01% to 0.4%.
When storing food in contact with the surface of the semi-permeable film, it absorbs drip leaching from food such as meat and fish to prevent discoloration and deterioration of the food contact surface, and to reduce moisture in food. Since there is no absorption, loss of food and reduction in commercial value due to drying are prevented. Since the other surface of the liquid-absorbent sheet is made of a liquid-permeable film, a large amount of drip or moisture during thawing is quickly absorbed from this surface, thereby preventing deterioration of the food.

Further , the liquid absorbing material contains a polymer water absorbing agent .
Therefore, the polymer water-absorbing agent quickly absorbs a large amount of drip, and irreversibly holds the drip against external pressure, so that the drip is absorbed smoothly and constantly during storage and transportation. The drip does not flow back to the food side.

Further, since the liquid absorbing material contains a wetting agent ,
The wetting agent enhances the drip suction of the absorbent material,
Since this is made flexible, the pinhole occurrence rate of the packaging material is reduced, and the freshness of the food can be more reliably maintained.

The liquid-absorbent sheet of the present invention having the above effects can be effectively used for preserving foods that cause drip such as meat and fish, and the quality and yield when transporting or storing in vacuum packaging. Needless to say, when the liquid absorbent sheet is laid, the freshness maintaining period or the expiration period of the food can be extended as compared with the related art in the case of opening or cooking and displaying the product at a store.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one configuration example of a liquid absorbing sheet of the present invention.

FIG. 2 is a cross-sectional view illustrating another configuration example of the liquid absorbing sheet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid-absorbing sheet 2 Polymer water-absorbing agent 3 Capillary liquid-absorbing material 4 Liquid-absorbing material 5 Liquid-permeable film 6 Semi-liquid-permeable film 7 Opening d Opening diameter

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ identification symbol FI B32B 27/02 B32B 27/18 Z 27/18 A23B 4/00 A (58) Investigated field (Int.Cl. ⁶ , DB name ) B65D 81/26 A23B 4/00 B32B 3/26 B32B 7/02 B32B 27/00 B32B 27/02 B32B 27/18

Claims (5)

(57) [Claims] 1. A capillary absorbent containing a polymer absorbent and a wetting agent.
Absorbent sheet incorporating the clamping sheet-shaped liquid-absorbent material Te met
Te, one of the outer surface of the absorbent liquid sheet liquid-permeable film Der
Ri, and the other outer surface consists HanTorueki film, the HanTorueki film is, which apertures are formed in the liquid-impervious film, to the hole diameter of the hole is not 0.05 mm 0. 5
mm and the porosity is 0.01 to 0.5 mm.
Absorbent sheet formed 4% within range. 2. A semi-liquid permeable film having a pore diameter of 0.1
2. The liquid-absorbent sheet according to claim 1, wherein the liquid-absorbent sheet is formed in a range of from mm to 0.3 mm and a porosity thereof is in a range of from 0.01% to 0.2%. 3. The liquid-absorbent sheet according to claim 1, wherein the semi-liquid permeable film is a polyethylene film or a polypropylene film having openings formed therein. 4. A liquid-absorbing material comprising a wetting agent such as ethylene glycol, propylene glycol, diethylene glycol monoethyl ether, 1,3-butylene glycol, glycerin, polyethylene glycol, polypropylene glycol, polyglycerin, xylitol, sorbitol, maltitol, The liquid absorbing sheet according to any one of claims 1 to 3, comprising at least one member selected from the group consisting of methylcellulose and carboxymethylcellulose. 5. A into contact with the surface of HanTorueki film of liquid-absorbing sheet according to any one food of claims 1 to 4, in food storage method for storing and vacuum packaged in air-impermeable film.