JP2000300227A - Drip-absorbing sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an antibacterial drip-absorbing sheet that properly correctly absorbs and removes the drip solution separating and flowing from meat, fish, vegetables, etc., and is capable of retaining freshness of the food for a long period of time. SOLUTION: This drip-absorbing sheet comprises a water-absorption sheet made of nonwoven fabric or paper, and a hydrophilic film that is laminated via an adhesive to at least one face of the water absorption sheet where an inorganic carrier adsorbing a freshness retention components is formulated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention absorbs and removes drip liquid separated and discharged from meat, fresh fish, vegetables, etc., prevents mold growth, suppresses bacterial growth, and maintains the freshness and quality of food for a long time. It relates to a drip absorbing sheet.

[0002] In recent years, various food products such as meat, fish, vegetables, and bento have been overwrapped or covered with a film of polyethylene or polypropylene or the like from a plastic container such as a tray made of expanded polystyrene, so that they can be sold in stores or distributed. Often placed. Of these food products, fresh food products such as meat and fish (sashimi), especially drip liquid, which is a sap separated and drained from frozen meat and frozen fish, accumulate in the area where food products come into contact with containers and at the bottom of food. In addition, it causes bacterial growth and mold generation, resulting in deterioration of food freshness and impairs taste of food.

[0003] Allyl isothiocyanate (CH ₂ = CHCH ₂ NCS) contained in wasabi and mustard has excellent antibacterial activity and is useful as a freshness preserving agent for fish meat and animal meat. A drip liquid absorbent has been proposed which combines such an isothiocyanate ester with a nonwoven fabric or a viscous composition of polyvinyl alcohol to absorb the drip liquid and maintain food freshness. JP-A-6-153779 discloses an antibacterial drip sheet in which a perforated film containing cyclodextrin containing allyl isothiocyanate and a nonwoven fabric are laminated.

[0004] However, conventional drip absorbers are:
It can not be said that it is compatible with various foods, such as excessively absorbing the free water of foods, and it can not maintain its performance for a long time, and its freshness retention performance and antibacterial properties are not satisfactory. Absent. Although allyl isothiocyanate exhibits an antibacterial action even at a low concentration, it is easily vaporized and volatilized, and the freshness retaining effect is lost in a short time. Also, other antibacterial components such as hinokitiol are known, but no effective drip absorbing sheet using these is known.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide an antibacterial drip absorbing agent capable of properly absorbing and removing drip liquid separated and flowing out of meat, fish, vegetables, etc., and maintaining the freshness of food for a long period of time. To provide a seat. The present inventors have conducted intensive research on such problems. As a result, the present inventors have found that the above-mentioned problems can be solved by adsorbing a freshness-retaining component on a specific carrier and using it for a drip sheet, thereby completing the present invention.

The present invention relates to a water-absorbent sheet made of non-woven fabric or paper, and a drip-absorbent sheet having a hydrophilic film provided on at least one side of the water-absorbent sheet with an adhesive therebetween. An object of the present invention is to provide a drip-absorbing sheet comprising an inorganic carrier to which components are adsorbed. In the present invention, the hydrophilic film is preferably bonded to both sides of the water-absorbent sheet, and the hydrophilic film preferably has an oxygen permeability of less than 500 mL / m ² · atm · 24 hrs. Further, it is preferable that at least one of the hydrophilic films bonded to the water-absorbing sheet is perforated.

The conventional drip-absorbing sheet appropriately absorbs moisture in foods having a lot of free water, and gradually releases antibacterial components such as isothiocyanic acid compounds to maintain the concentration of antibacterial components in food packages properly for a long period of time. And the freshness of meat, fish, etc. could not be maintained sufficiently.

[0008]

DETAILED DESCRIPTION OF THE INVENTION (Water absorbent sheet) In the present invention, a nonwoven fabric or paper is used as the water absorbent sheet. When paper is used as the water-absorbing sheet, it may be a paper made from softwood pulp, hardwood pulp, mulberry, mitsumata, or a mixture of rayon, polyethylene, and cotton fibers.

Examples of the raw material of the nonwoven fabric include natural fibers such as cotton, pulp and wool, recycled fibers such as rayon, and synthetic fibers produced from synthetic polymers such as vinylon, nylon, polyester, polyethylene, polypropylene, and acrylic. be able to. These fibers may be used alone or may be mixed and compounded.

When synthetic fibers are used as the raw material of the nonwoven fabric, the fibers used may be fibers blended with different polymers, fibers having a core-sheath structure, or fibers having a bimetal structure. Further, the cross section of the fiber may have an irregular cross-sectional structure in addition to the normal circular fiber. The method for producing the nonwoven fabric is not particularly limited, and may be one produced by a conventionally known method. Depending on the fiber used, any of the well-known techniques such as the chemical bond method, fiber lock method, air lay method, stitch bond method, spun bond method, melt blow method, spunlace method, thermal bond method, needle punch method, wet method, etc. Can be adopted.

(Inorganic carrier) Various inorganic carriers can be used as the carrier for adsorbing the freshness-retaining component. Examples of such an inorganic carrier include calcium silicate, calcium carbonate, and various minerals, and minerals are particularly preferable.
For example, silica mineral, α-sepiolite having a fibrous structure in a clay mineral composed of magnesium hydrate silicate,
Β-sepiolite consisting of massive structure, attapulgite of fibrous clay mineral consisting of hydrous magnesium silicate,
Further, zeolite (zeolites), which is a hydrous tectosilicate mineral of alkali metals such as Na and K, alkaline earth metals such as Ca and Mg, and aluminum, may be mentioned. Specific examples of the zeolite group include triaxial mesotypes such as monoaxial borate, tetragonal leopardite, orthorhombic Thomsonite, monoclinic mondenite, and the like. Zeolite and the like can be mentioned. Of these, silica minerals and sepiolite are particularly preferred. These carriers may be used alone or as a mixture.

More preferably, such an inorganic carrier is coated with a coating agent. Fatty acids and their derivatives, higher alcohol compounds and the like are used as such coating agents. Fatty acids include stearic acid, behenic acid, lauric acid, myristic acid, undecylic acid. Fatty acid derivatives include fatty acid esters,
For example, glycerin fatty acid ester, ethylene glycol fatty acid ester, and sorbitan fatty acid ester can be mentioned. Polyethylene glycol as the higher alcohol,
Examples include polypropylene glycol and polyglycerin.

The amount of the coating agent used to coat the carrier is 0.01 to 10 times, preferably 0.2 to 3 times the weight of the carrier. This is blended with the adhesive as a carrier for the freshness retaining agent.

(Freshness holding component) As the freshness holding component, a volatile substance having a freshness holding performance is used. Such freshness-retaining components include an isothiocyanate compound, a spice extract, cinamic aldehyde, geraniol, hinokitiol, eugenol, carvacrol, thymol,
Hinokitiol, borneol and pinene. Of these, isothiocyanate compounds are preferred. These can be used alone or in combination.

The isothiocyanate compound includes:
Allyl isothiocyanate, butyl isothiocyanate and derivatives thereof are preferred, and allyl isothiocyanate is particularly preferred. In addition, these isothiocyan compounds may be natural products or synthetic products. Further, it may be a wasabi extract or mustard extract containing these as an active ingredient.

The amount of the freshness-retaining component with respect to the entire drip-absorbing sheet is adjusted by adjusting the amount of the inorganic carrier adsorbed on the inorganic carrier, the amount of the inorganic carrier incorporated into the adhesive, and the amount of the adhesive used in the lamination. The amount of the freshness preserving agent to be used is 0.01 to 30% by weight, preferably 0.1 to 10% by weight, based on the total weight of the drip absorbing sheet. If the amount is less than this, the effect of maintaining freshness is not sufficient,
On the other hand, if it is more than this, the isothiocyanate compound is not mixed with the carrier, which is not preferable.

Usually, the amount of the freshness retaining agent adsorbed on the carrier is 0.5 to 200 parts by weight per 100 parts by weight of the carrier. The amount of the inorganic support absorbent sheet 1 m ² per 0.
1 to 20 g, preferably 1 to 20 g.

(Hydrophilic film) The hydrophilic film layers provided on both sides or one side of the surface of the water-absorbing sheet include polyamide, polyvinyl alcohol, EVOH (ethylene-vinyl alcohol copolymer), cellulose, polybutadiene film, and polybutadiene film. A stretched or non-stretched film based on vinyl acetate or the like, a composite film obtained by laminating the stretched or unstretched films, and a film obtained by hydrophilically treating the surface of a hydrophobic film are exemplified. The types of these hydrophilic films can be selected according to the amount of drip liquid of the target food.

Specific examples of the polyamide-based film include homopolymers such as nylon 6, nylon 66, nylon 46, meta-xylylenediamine-adipic acid polymer (MXD-6), and copolymers thereof. Examples of the film include films obtained by copolymerizing a polyamide-forming component such as hexamethylenediamine-isophthalic acid and hexamethylenediamine-terephthalic acid with the above-mentioned various nylons.

Specific examples of the polyvinyl alcohol-based film include various polyvinyl alcohol-based films obtained by completely or partially saponifying polyvinyl acetate, and examples of the EVOH-based film include ethylene-vinyl alcohol copolymer and ethylene-vinyl Mention may be made of films based on alcohol vinyl acetate copolymers.

Cellulose and carboxymethyl cellulose are usually used as the cellulosic film.
Examples of the composite film include a film obtained by blending another polymer with a polyamide, polyvinyl alcohol, EVOH, or cellulose base polymer, or a multilayer structure. As a blend film, for example, nylon 6, nylon 66, nylon 46, MXD
A film having a three-layer structure of nylon 6 / MXD-6 / nylon 6, nylon 6 / EVOH / nylon 6, and the like are exemplified as a multilayer structure film.

Examples of the film obtained by hydrophilically treating the surface of a hydrophobic film include polyethylene glycol, polypropylene glycol, polyacrylamide, polyacrylamide, and polyethylene glycol, polypropylene, polystyrene, polyvinyl chloride, polyethylene terephthalate, and polybutylene terephthalate. Acrylic acid, a compound or polymer having a hydrophilic unit such as polyacrylic acid ester, and a film to which a hydrophilic layer is provided by using a resin or the like containing a water-absorbing inorganic substance such as silica gel using a means such as coating. Can be mentioned.

Further, a film having a gas barrier property by providing a polyvinylidene chloride layer on one surface of the above-mentioned various films can also be used. In this case, it is desirable to use the polyvinylidene chloride layer so that it is on the back side.

In general, in order to improve the freshness retention performance of water-containing meat, fish, vegetables, and the like, it is necessary to quickly absorb liquids such as water coming from foods into the film layer. For this reason, it is desirable to use a perforated film formed by perforating one or both hydrophilic films of the drip absorbing sheet.

When micropores are provided on the film surface, the liquid dropped and adhered to the film surface is absorbed by the water-absorbent sheet through the holes, the water activity on the surface of the food is reduced, the growth of bacteria is suppressed, and the freshness is reduced. The holding performance is further improved. In addition, the freshness-retaining component is released from the pores to directly contact the food, thereby improving the freshness-retaining effect.

The perforation processing method of the hydrophilic film includes a hot needle method, a melt perforation method, a laser beam method, and the like. Selected by gender. The pore diameter is usually from 0.01 to 2 mm, and more preferably from 0.1 to 0.5 mm. The opening area ratio is usually 0.0001 to 10%, more preferably 0.055 to 5%.

In the drip absorbing sheet of the present invention, it is preferable to bond a hydrophilic film to both surfaces of the water absorbing sheet via an adhesive. The oxygen permeability of the hydrophilic film is less than 500 mL / m ² · atm · 24 hrs, preferably 300 mL / m ² · atm · 24 hrs or less. If the oxygen permeability is higher than this, the amount of the freshness-retaining component released through the film becomes too large, and the sustained-release property is undesirably reduced.

When the hydrophilic film is provided on the surface of the water-absorbent sheet as described above, it is possible to suppress and adjust the permeation rate of the drip liquid, while controlling the amount of the freshness retaining component released from the inside of the sheet of the present invention. As a result, appropriate hygroscopicity and sustained release of the active ingredient are maintained, and a good freshness maintaining effect on meat, fish meat and vegetables is obtained.

(Manufacture of Adhesive and Drip Sheet) The adhesive used in the present invention contains an inorganic carrier that holds the freshness-retaining component, and adheres the water-absorbent sheet and the hydrophilic film. Various methods may be used to produce the drip absorbing sheet of the present invention. For example, an adhesive containing an inorganic carrier to which a freshness-retaining component has been adsorbed is applied to one side, preferably both sides, of a water-absorbent sheet, and a hydrophilic film is attached.

Various methods such as a wet lamination method using an aqueous adhesive, a dry lamination method using a solvent-based adhesive, and a hot melt method are used for bonding (laminating) the water-absorbent sheet and the hydrophilic film. And various adhesives are used accordingly.

The adhesive used in the wet lamination method includes, for example, an aqueous emulsion composed of vinyl acetate resin, acrylic resin, vinyl acetate-acrylic resin, urethane-acrylic resin and the like. Also, as an adhesive used in the dry lamination method,
For example, a solvent-based or solvent-free adhesive such as an acrylic resin, a modified vinyl copolymer-based resin, a polyether-type polyurethane resin, an aliphatic polyester-type polyurethane resin, an aromatic polyester-type polyurethane resin, and an epoxy-based resin may be used. . Examples of the adhesive used in the hot melt method include an ethylene-vinyl acetate copolymer resin, a polyamide resin, and a polyester resin.

These adhesive layers may be provided uniformly on one surface, or may be provided in a linear or dotted shape so that the water-absorbing sheet and the hydrophilic film can be bonded together.

As another method, a carrier not adsorbing the freshness-retaining component is mixed with an adhesive, and a laminate sheet obtained using this adhesive is placed in a predetermined pressure-resistant container, and the pressure inside the container is reduced. . Next, the inside of the container is heated to 50 to 70 ° C., preferably 50 to 60 ° C., and an antibacterial component such as an isothiocyanate compound (for example, allyl isothiocyanate) is introduced therein by a method such as spraying. After sufficiently evaporating the freshness holding component in the container, the inside of the container is returned to normal pressure,
The active ingredient may be adsorbed on the sheet.

[0034]

Next, the present invention will be described more specifically based on examples. Example 1 2 g of glycerin distearate and 1 g of stearamide were dissolved in 5 g of ethanol and 10 g of water. The resulting solution was coated on granular silica (0.1 μm), dried at 90 ° C. and the solvent was evaporated to form a coating on the surface of the silica particles (coating amount: 0.1 μm).
2 g / g). 10% by weight of the thus prepared inorganic carrier was mixed with the adhesives shown in Table 1, and a sheet in which hydrophilic films were bonded to both surfaces of a water-absorbent sheet was produced using this adhesive. The amount of the inorganic carrier in these sheets (g / m
² ) is shown in Table 1.

Next, the sheet was sealed in a pressure-resistant container and kept at a vacuum (5 mmHg). Then, a carbon dioxide gas containing allyl isothiocyanate (AIT) (AIT 1
(0%). After standing for 24 hours, the sheet was taken out of the pressure-resistant container. The obtained drip absorbing sheet was subjected to the following test.

(Test Method) The drip-absorbing sheet obtained in the example was laid on the bottom of a polyethylene container having a capacity of 200 mL, 50 g of lettuce was placed thereon, and the polyethylene film was overlapped with a polyethylene film (thickness: 30 μm). This was kept at 10 ° C. for 72 hours. On the other hand, a blank without a drip absorbing sheet was kept under the same conditions (Comparative Example 1). The gas in the closed container is sampled every predetermined time and analyzed by gas chromatography.
(Column filler: Salmon 3000, Column temperature: 120
° C; Carrier gas: N ₂ , Carrier gas pressure: 0.5 kg
/ Cm ² ) and the concentration (ppm) of allyl isothiocyanate (AIT) over time were measured, and the appearance of lettuce was observed.

[0037]

[Table 1] (Appearance)-: No change, ±: Light brown, +: Brown

(Non-woven fabric) Cotton: Cot Ace C040S / A made by Unitika
01 (40 g / m ^{2 in} weight) Rayon: Apitas by Daiwa Spinning (60 g in weight /
m ²⁾ Cotton / ester: Unitika Esukotto C05
0E / A02 (Cotton / Polyester = 40/60, Weight 5
0g ^{/ m} 2)

(Hydrophilic film) EVOH: EVAL EF-XL (Kuraray, thickness 15
μ) PVA: Nippon Gohsei Chemical's Popron # 140 (Thickness 1)
4μ) Cellophane: PL # 300 (20μ thick) manufactured by Nimura Chemical Multilayer nylon: Embron M-100 manufactured by Unitika
(Thickness 15μ)

(Adhesive) Adhesive A: vinyl acetate-acrylic water-based emulsion Adhesive B: solvent-type polyurethane

As is clear from Table 1, the blank changed greatly in appearance and changed to brown, whereas
In the lettuce of No. 4, it is recognized that there is no change in appearance and freshness is maintained.

The inorganic carrier prepared in Example 1 was mixed with the adhesive A (15% by weight). Using this adhesive, a non-woven fabric (Cot Ace CO60S / A01 made by Unitika, basis weight)
A nylon film (Emblem ONM-15 manufactured by Unitika, thickness: 15 μm) was bonded to both sides of 60 g / m ² ). The amount of the inorganic carrier in this sheet was 6 g / m ² .

This sheet was bisected, and one of the sheets was treated in a pressure vessel in the same manner as in Example 1 to adsorb AIT to obtain a drip-absorbing sheet (Example 5). On the other sheet, all layers (both sides of the film) were perforated by a hot needle method, and the hole diameter was 0.25 mm, the number of holes was 20,000 / m ² ,
A perforated sheet having an opening area ratio of 0.1% was obtained. This was treated similarly to adsorb AIT to obtain a drip absorbing sheet.
(Example 6). These sheets were subjected to the following tests.

(Test Method) Tuna cuts (100 g) were placed on a sheet cut into a 7 × 14 cm square, wrapped with a polyethylene film (thickness: 30 μm), and allowed to stand at 10 ° C. for the number of viable bacteria (cells / piece). The change with time in g) was examined. Table 2 shows the result of comparison with the case where the sheet was not used (Comparative Example 2).

[0045]

[Table 2]

Example 5 shows an excellent antibacterial effect as compared with Comparative Example 2 in which no freshness preserving agent is used. Further, the perforated one as in Example 6 has a better antibacterial effect because the water and gravy (free water) coming out of the tuna are quickly absorbed by the water-absorbent sheet through the holes of the film. Show.

[0047]

The drip-absorbing sheet of the present invention has a
Appropriately absorbs and removes drip liquid that separates and flows out of fish, vegetables, etc., and has an antibacterial effect, and keeps food fresh for a long time.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) A23L 3/3535 A23L 3/358 3/358 B65D 81/26 H B65D 81/26 85/50 A 85/50 A23B 4/00 Z (71) Applicant 593093065 Sanyo Techno Co., Ltd. 1504-4 Shinnobe, Beppu-cho, Kakogawa City, Hyogo Prefecture Person Tohru Okada 688-3 Minori, Kakogawa-cho, Kakogawa-shi, Hyogo (72) Inventor Takashi Okamoto 4-1-1, Kutaro-cho, Chuo-ku, Osaka-shi, Osaka Unitika Incorporated Osaka Headquarters (72) Inventor Kenji Maeda, Hyogo 1504-4 Shinnobe, Beppu-cho, Kakogawa-shi F term (reference) 3E035 AA04 AA05 AA11 AB03 BA02 BC01 BC02 BD10 DA10 3E067 AB02 AB04 AB08 BA10A BB01A BB06A BB14A BB15A BB16A BB22A BB25A CA09 EC32 EC33 EE32 GB06 GC05 GD01 4B021 LA17 LW02 LW03 LW04 MC01 MC04 MC06 MK03 MK05 MK17 MP02 MQ04 4B069 AA04 HA01 KA01 KA08 KB07 KC21 KD08

Claims (8)

[Claims] 1. A drip-absorbing sheet comprising a water-absorbent sheet made of nonwoven fabric or paper, and a hydrophilic film provided on at least one surface of the water-absorbent sheet with an adhesive interposed therebetween.
A drip absorbing sheet comprising the adhesive and an inorganic carrier to which a freshness-retaining component is adsorbed. 2. The drip-absorbing sheet according to claim 1, wherein the hydrophilic film is provided on both sides of the water-absorbent sheet. 3. The hydrophilic film has an oxygen permeability of 500 m.
^2. The drip-absorbing sheet according to claim 1, wherein the drip-absorbing sheet is less than L / m ² · atm · 24 hrs. 4. The drip-absorbing sheet according to claim 1, wherein at least one of the hydrophilic films bonded to the water-absorbing sheet is perforated. 5. The freshness preserving component is at least one freshness preserving agent selected from an isothiocyanate compound, a spice extract, cinamic aldehyde, geraniol, hinokitiol, eugenol, carvacrol, thymol, borneol and pinene. Item 5. The drip absorbing sheet according to any one of Items 1 to 4. 6. The inorganic carrier is at least one carrier selected from silica, zeolite, sepiolite, calcium silicate and calcium carbonate, and at least one carrier selected from fatty acids and derivatives thereof and higher alcohol compounds. The drip absorbing sheet according to any one of claims 1 to 5, which is covered with a covering layer. 7. The film according to claim 1, wherein the hydrophilic film is at least one film selected from polyamide, polyvinyl alcohol, polybutadiene, polyvinyl acetate, an ethylene-vinyl alcohol copolymer, and a cellulose film. Drip absorbing sheet. 8. The drip-absorbing sheet according to claim 1, wherein the non-woven fabric is a non-woven fabric using at least one non-woven fabric material selected from cotton, pulp, rayon, vinylon, nylon, polyester, polyethylene and polypropylene. .