JP3008508U - Frozen / Refrigerated Showcase Cover Sheet - Google Patents

Abstract

(57) [Summary] [Purpose] A cover for a freezer / refrigerator showcase that is lightweight and compact, and that can suppress dew condensation during freezer / refrigerator storage and reduce power consumption spent in freezer / refrigerator. Provide materials for. [Composition] A cover sheet for a frozen / refrigerated showcase in which a soft polymer material is applied to at least one side of a fabric.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cover sheet for a frozen / refrigerated showcase. The present invention particularly relates to a cover sheet for a frozen / refrigerated showcase for display in a store where fresh foods such as supermarkets, for example, fish and shellfish, meats, vegetables and fruits are displayed.

[0002]

[Prior art]

 In general, fresh food in supermarkets and the like is displayed in a freezing / refrigerating case for the purpose of maintaining freshness during opening, and after closing, unsold fresh food is frozen in the freezing / refrigerating case as it is displayed. -It is stored refrigerated. At that time, the freezing / refrigerating case was kept cool by shutting it off from the outside with a shutter or cover made of hard plastic.

As such a shutter or cover made of hard plastic, one having a hollow structure or one having polystyrene foam filled therein has been used in order to have a heat insulating property. However, conventionally used heat insulating shutters or covers have almost no moisture permeability and are liable to cause dew condensation. This condensed water causes damage to fresh food and shortens product life. In addition, when opening the store, rolling up the shutter or cover, and when removing it, dew condensation fell on the floor surface, and cleaning the floor was necessary, which was a troublesome task. In addition, since the freezing of water droplets requires energy, there is a problem that the amount of electric power consumed at night increases.

Further, since the device is made of hard plastic, the device itself is large and heavy, and it is necessary to provide a storage space on the ceiling or the like or cover it with a cover so as not to be seen by customers during opening. Was becoming. To solve these problems, a roll curtain type using a hard plastic film with a large number of holes has come to be used, and the cover for freezing and refrigerating showcases has become light and compact, and the storage space has been reduced. Problems and problems of removing the cover before opening and installing the cover after closing were significantly improved.

However, even with a film having a large number of holes, dew condensation occurs on the film surface, and there are still problems such as the necessity of cleaning the floor surface in the store and shortening the life of the product. In addition, because a hard plastic film is used, the roll curtain cover itself has a short product life when the cover is removed before opening and when the cover is attached after closing. . Furthermore, the power consumption could be reduced by only about 4% compared to when the cover was not used, making it difficult to achieve the purpose of use of the cover itself.

[0006]

[Problems to be solved by the device]

 The present invention solves the problems of the prior art as described above, and is a lightweight and compact refrigeration / refrigeration showcase cover material, especially for freezing / refrigeration by suppressing dew condensation during freezing / refrigeration storage. It is intended to provide a material for a cover of a frozen / refrigerated showcase that can reduce power consumption.

[0007]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a cover sheet for a frozen / refrigerated showcase in which a soft polymer material is applied to at least one surface of a fabric. A cross section of an example of a seat according to the present invention is schematically shown in FIG. 1 is a fabric and 2 is a soft polymeric material.

Examples of useful fabrics for the sheet of the present invention include chemical fibers made of polyester, polyamide, acrylic, rayon, etc., natural fibers such as cotton, wool, etc., or fabrics made by mixing these fibers, These may be in the form of woven or knitted fabric or non-woven fabric. From the standpoint of workability at the time of attachment to a showcase and storage form, a woven fabric is preferable. Further, when a fabric such as polyester having a low hygroscopic property is used, it is preferable to subject the base fabric to a hygroscopic process as a means for suppressing dew condensation. The hygroscopic processing method is not particularly limited as long as known hygroscopic or hydrophilic processing can be performed.

Examples of the soft polymer material include soft urethane resin, acrylic resin, vinyl chloride resin, rubber and the like. Furthermore, it is preferable that the soft polymer material has a property of preventing dew condensation. The anti-condensation property in the present invention should have moisture permeability for moving water vapor from the cold insulation to the outside and, in addition to this, the ability to move water droplets once condensed on the cold insulation to the outside. . Regarding the moisture permeability, the value measured by JIS L 1099 is preferably 1000 g / m ² · 24 hrs or more. Further, as the performance of moving the condensed water droplets to the outside, the value of the amount of condensation measured by the following method is preferably 50 g / m ² · hr or less.

Measurement of Dew Condensation A 500 ml beaker containing 500 ml of warm water at 40 ° C. is covered with a sample and fixed with a rubber band or the like. This beaker is left in a thermo-hygrostat for 1 hour under the conditions of 10 ° C. and 60% RH. Measure the amount of water droplets attached to the sample after 1 hour and use it as the amount of dew condensation. However, the unit is converted to g / m ² / hr.

More specifically, a resin known as a material for a moisture-permeable waterproof cloth is preferable, and particularly, a urethane resin, an amino acid-modified urethane resin, a fluorine-containing urethane resin and Japanese Patent Application No. 4-206720 are described. The moisture-permeable urethane resin described above is preferably used, and is obtained by reacting an isocyanate, a polyol and a chain extender described in Japanese Patent Application No. 206720/1992 from the viewpoint of preventing dew condensation and reducing power consumption. Further, a moisture-permeable urethane resin having at least 7.0 mol / kg of ethylene oxide unit is particularly preferably used.

The application of the soft polymer material to the fabric can be performed by various methods known as a method for producing a moisture-permeable waterproof fabric, such as a coating method and a laminating method in addition to a dry method and a wet method. Can be used. Further, the obtained film of the soft polymer material may be non-porous or porous.

[0013]

[Action and effect]

 Like the car seat, the seat with the above-mentioned structure is put on the freezing / refrigerating showcase for exhibition, or by using the roll curtain method like the shutter currently used, the cold insulation part and the outside world are separated. In comparison, a lightweight and compact cover for a frozen / refrigerated showcase can be obtained. Furthermore, by using a soft polymer material having anti-condensation properties, this cover sheet does not generate dew condensation, enhances the freshness-keeping ability of stored fresh foods, and also reduces power consumption. . Furthermore, this cover sheet has the advantages that dew condensation is less likely to occur, power consumption is further reduced, and tearing of the cover is less likely to occur, as compared with those using a hard plastic film.

[0014]

【Example】

 The present invention will be further described with reference to examples. Example 1 Polyester pongee fabric (both warp and weft 75D-72F, warp density: 101 yarns / inch, weft density: 80 yarns / inch) was coated with hydrophilic polymer SR5000 (trade name, manufactured by Takamatsu Yushi Co., Ltd.). % Aqueous solution was padded, dried and cured.

Next, 50 parts by weight of an ester-ether polyurethane resin and 50 parts by weight of an ether polyurethane resin having a glass transition point of −4 ° C. and a fraction of ethylene oxide in the polymer of 8.4 mol / kg as a soft polymer material. 20 parts by weight of dimethylformamide (DMF) and 1 part by weight of an isocyanate cross-linking agent, Resamine NE (trade name, manufactured by Dainichi Seika Co., Ltd.) were mixed and mixed with the above-mentioned woven fabric in an amount of 15 g / m ² . Application, wet coagulation for 5 minutes, desolvation with water at 25 ° C., washing, drying, and final setting at 150 ° C., a porous cover sheet for a fresh food refrigerated showcase was obtained. A roll curtain was prepared from the obtained sheet and used as a cover for a fresh food refrigerated showcase to examine the power consumption and the presence or absence of dew condensation. The results are shown in Table 1.

Example 2 As a soft polymer material, at a glass transition point of −8.5 ° C., 60 parts by weight of toluene was added to 100 parts by weight of an ether type polyurethane resin having a fraction of ethylene oxide in the polymer of 7.4 mol / kg. In addition, the mixed resin solution was applied on a release paper in an amount of 80 g / m ² and dried. Next, a moisture-permeable resin for a binder was applied to the obtained resin film surface, and the same cloth used in Example 1 was bonded to one surface of the same. After aging all day and night, the release paper was peeled off to obtain a non-porous cover sheet for the refrigerated showcase of fresh food. A roll curtain was prepared from the obtained sheet and used as a cover for a refrigerated showcase of fresh food, and the power consumption and the presence or absence of dew condensation were examined. The results are shown in Table 1.

Example 3 A resin solution prepared by adding 40 parts by weight of DMF and 1 part by weight of Resamine NE to 100 parts by weight of a fluorine-containing urethane resin (glass transition temperature −50 ° C.) as a soft polymer material and mixing them was prepared as in Example 1. 200 g / m ² was applied to the same fabric as used in Example 1, wet coagulation, desolvation, washing, drying and finishing set at 150 ° C. were carried out in the same manner as in Example 1 to obtain a porous fresh food. A cover sheet for a refrigerated showcase was obtained. A roll curtain was made from the obtained sheet and used as a cover for a fresh food refrigerated showcase, and the power consumption and the presence or absence of dew condensation were examined. The results are shown in Table 1.

Example 4 A cover sheet for a fresh food showcase was obtained in the same manner as in Example 1 except that a mixed urethane resin containing 50 parts by weight of an amino acid-modified urethane resin and 50 parts by weight of an ester-based polyurethane resin was used as the urethane resin. It was A roll curtain was prepared from the obtained sheet and used as a cover for a fresh food refrigerated showcase, and the power consumption and the presence or absence of dew condensation were examined. The results are shown in Table 1.

Example 5 As a soft polymer material, 100 parts by weight of an acrylic resin (trade name: AX20, manufactured by Negami Kogyo Co., Ltd.), 1 part of a catalyst (trade name: Catalyst C-46, manufactured by Negami Kogyo Co., Ltd.), isocyanate (Japan The same fabric as used in Example 1 was coated with a mixed resin solution of 1 part of Polyurethane Co., Ltd., trade name Coronate L) and 2 parts of ethyl acetate, dried, and finish-set at 150 ° C. to obtain non-porous property. A cover sheet for a refrigerated showcase of fresh food was obtained. A roll curtain was made from the obtained sheet and used as a cover for a refrigerated showcase for fresh food, and the power consumption and the presence or absence of dew condensation were investigated. The results are shown in Table 1.

Comparative Example 1 Using a shutter-type fresh food refrigerated showcase cover made of hard plastic foam, power consumption and the presence or absence of dew condensation were similarly examined. The results are also shown in Table 1. Comparative Example 2 Fresh food in the form of a roll curtain in which a large number of holes were formed in a hard plastic film A refrigerated showcase cover was used to similarly examine power consumption and the presence or absence of dew condensation. The results are also shown in Table 1.

The power consumption and the presence or absence of dew condensation were measured as follows. That is, the sheets and foams of Examples and Comparative Examples obtained above were actually used as a cold insulation cover of a fresh food cold storage case (height: 1.5 m, width: 25 m), and the temperature in the cold storage case was −2 ° C. The results of visual observation of the condensation on the cover were compared with the power consumption used to maintain the refrigeration temperature. The outside air temperature at this time was 20 ° C.

[0022]

[Table 1]

[Brief description of drawings]

FIG. 1 is a cross-sectional view schematically showing an example of a cover sheet for a frozen / refrigerated showcase according to the present invention.

[Explanation of symbols]

 1 ... Fabric 2 ... Soft polymer material

Claims (5)

[Scope of utility model registration request] 1. A cover sheet for a frozen / refrigerated showcase, which is obtained by applying a soft polymer material to at least one side of a cloth. 2. The sheet according to claim 1, wherein the soft polymer material has a dew condensation preventing property. 3. The sheet according to claim 2, wherein the soft polymer material is a moisture permeable urethane resin. 4. The sheet according to claim ² , which has a moisture permeability of 1000 g / m ² · 24 hrs or more as measured by JIS L 1099. 5. The sheet according to claim ² , wherein the amount of dew condensation is 50 g / m ² · hr or less.