JPH0966971A - Cool box - Google Patents

Abstract

(57) [Summary] [Objective] The present invention can be used in the same manner as a conventional cold storage box for agricultural and marine products made of synthetic resin, and is an environmentally friendly agricultural box.
It relates to a cool box for marine products. [Composition] A cold box for agricultural and marine products, which is obtained by adding moisture and a sizing agent to natural fiber, molding and drying.

Description

Detailed Description of the Invention

[0001]

[Industrial application] The present invention relates to an agricultural and marine product cold storage box that can be used in the same manner as conventional synthetic resin agricultural and marine product cold storage boxes and is also environmentally friendly.

[0002]

2. Description of the Related Art Conventionally, foamed plastic boxes have been widely used as cold boxes for agricultural and marine products. These farms
Cooling boxes for seafood are lightweight, inexpensive, and easy to handle, so demand has grown significantly. However, in recent years, environmental problems have been highlighted, and foamed plastic products have been a problem in disposal and incineration. In addition, the foamed plastics that are usually used in such cold boxes for agricultural and marine products are so-called "beads", in which a pre-expanded granular material is filled in a mold and foamed a second time in the mold to obtain a molded product. "Foaming" has been widely used because a molded product can be easily obtained. However, in this "bead foaming" molded product, there is a gap between the secondary foamed beads. Therefore, when used for seafood such as fish, the drip that comes out of the contents will soak into the gaps, and even if you wash it once after use, it will cause a strong fishy odor. It was difficult to use, and its use was practically limited to one way. Similarly, in the case of agricultural products such as vegetables, the use of soil and dust has been limited to one way due to hygiene and aesthetic problems.

[0003]

[Problems to be solved by the invention] Agriculture satisfying the following conditions:
It is to provide a cool box for marine products. It can be used like that of foamed plastic. Can be easily reused, discarded, or incinerated. It can meet diversifying user needs. It has a heat insulating property similar to or higher than that of foamed plastic. It has strength and durability similar to or higher than that of foamed plastic. And, if possible, it can be reused repeatedly. It is easy to remove the dirt adhering to the surface during the material recycling process.

[0004]

[Means for Solving Problems]

[0005]

[Figure 1]

[0006]

FIG. 2

FIG. 1 shows a schematic view of an embodiment of the cold box for agricultural and marine products of the present invention. In the example in which the fish 12 is put in the cold box 1 for agricultural and marine products as a content, the material 10 is made of natural fibers such as paper or natural fibers such as paper and a reinforcing material, which will be described in detail later. The method of use is the same as the conventional cold storage box for agricultural and marine products made of expanded plastic. FIG. 2 shows an example in which fruit 22 is put as the contents. A lid 11 may be attached to these agricultural and marine product cold storage boxes 1 as needed. Regarding contents, FIGS. 1 and 2 show fish and fruit, respectively, but the present invention is not limited to these agricultural and marine products, and may be used for processed foods.

[0008]

FIG. 3

[0009]

FIG. 4

The material 10 of the cold box for agricultural and marine products of the present invention is
Natural fibers (hereinafter abbreviated as natural fibers) 31 such as disintegrated paper as shown in FIG. 3 may be moistened to evenly disperse the sizing agent, or strength as shown in FIG. In order to improve the above, the reinforcing material 32 may be uniformly mixed with the defibrated natural fiber 31 at a constant ratio, then moistened and the paste may be evenly dispersed. As the reinforcing material 32, a paper cut into strips, a fiber longer than the natural fiber 31, or the like is used.

As the material used for the natural fiber 31,
Any natural fiber such as paper, hemp or the like may be used, but as an easy-to-use product, there is softwood pulp used for newspapers and the like. Hardwood pulp, which is used for computer-related printer paper and the like, has short fibers and does not have improved strength. However, when it is cut into strips and used as the reinforcing material 32, there is no problem. Further, as a method for improving the strength, it is also possible to use a paper mixed with a synthetic resin, for example, a crushed product of a milk carton.

When paper is cut into strips as the reinforcing material 32, the paper has dimensions such that the width is 0.3 to 3.0 mm, preferably 1.0 to 2.0 mm, and the length is 3 to 10 mm. It is preferably 5 to 7 mm. If a paper smaller than this is used, sufficient strength cannot be obtained against a force such as bending, and if it is too large, entanglement between them is less likely to occur and strength cannot be obtained.

Instead of the cut paper as the reinforcing material 32,
Matrix natural fiber 31 obtained by crushing cotton defibrated fibers, cotton cloth scraps, hemp (including outer skin and wood), human silk thread, etc.
Longer natural or regenerated fibers, preferably hydrophilic, may be used. The fibers longer than the fibers of the paper may be uniformly mixed with the fibers 2 of the paper at a constant ratio. The length of this fiber is preferably 5 to 30 mm, especially 10 to 20 mm. If the fiber is shorter than this, it is the same as the natural fiber 31 of the matrix, and if the fiber is too long, it is difficult to uniformly mix it with the fiber of the paper. The maximum thickness is 500 denier, preferably 300 denier. Fibers that are too thick have high rigidity and interfere with mixing with the natural fibers 31.

When PVA (polyvinyl alcohol) fiber is used as the reinforcing material 32, the PVA fiber is surrounded by the natural fiber 3 by being humidified and heated in the molding process.
If it becomes 1, it remains in a melted and infiltrated state and is dried in that state in the subsequent drying step, so that a molded product having extremely high strength can be obtained. In addition, a double-structured fiber using a low melting point polyolefin resin for the outer layer and a high melting point polyolefin resin for the inner layer (trade name, manufactured by Chisso Corporation, "EKC (INTAC
If K) ”) is used, the fibers of the resin in the inner layer remain, but the resin in the outer layer is melted and permeates the surrounding natural fibers 31 and then is cooled and solidified by the heating step in the manufacturing process. It becomes a strong molded product.

The mixing ratio of the natural fiber 31 and the reinforcing material 32 is appropriately 1: 9 to 9: 1, preferably 2: 8 to 8: 2. The strength and the apparent specific gravity of the molded product can be freely selected by arbitrarily changing the mixing ratio. However, when the mixing ratio exceeds the above range, if the amount of the reinforcing material 32 is too small, the molded product is no different from the molded product of only the natural fiber 31, and if the amount of the reinforcing material 32 is too large, The natural fibers 31 are not sufficiently spread in the entangled gaps, which makes the strength rather brittle.

The sizing agent dispersed in the fibers of the paper may be any sizing agent that can be uniformly dispersed in a water-added material, but considering disposal such as recycling, disposal or incineration, Water-soluble PVA (polyvinyl alcohol), polyacrylic amide, latex rubber,
Natural materials such as CMC (carboxymethyl cellulose) and starch paste are preferable. As PVA, various combinations of polymerization degree and modification degree are used.

In order to obtain a molded product of these natural fibers, as in Japanese Patent Laid-Open No. 52-130788, a paper cut product is stirred, and a mud-like liquid to which glue is added is poured into a mold. A method of molding, a method of crushing paper into a feather shape as in JP-A-5-254565, filling a mold with a mixture of this and stirring, and heating and drying by dielectric heating or microwave heating, Japanese Patent Application Laid-Open No. 5-246465 discloses a method in which paper is defibrated to form a cotton-like material, water is added thereto to form a sponge-like material, and then powdery or granular paste is added and the mixture is molded and dried. However, also in the cold box for agricultural and marine products of the present invention, a molded article is obtained by adding a sizing agent to the fibers of paper, filling and pressing the mold, and heating and drying. Also,
After molding, the surface of the molded product may be subjected to water repellent treatment.

[0018]

FIG. 5

As a water repellent treatment, as shown in FIG.
You may cover the surface of the cold box for marine products with 51, such as a synthetic resin and a paste. Synthetic resins used for such applications include synthetic resins such as polyethylene, polypropylene, vinyl chloride, nylon, PVA (polyvinyl alcohol) and modified PVA, and biodegradable resins such as polylactic acid and fatty acid polyester, and skin packs. Alternatively, a method such as Breester pack may be used, and starch as starch, modified starch, PVA (polyvinyl alcohol), modified PVA, etc., or a mixture thereof, a compound or lignin, konjac paste, polyacryl amide, or It may be covered by coating or spraying with an aqueous solution or emulsion of a water resistant protein such as zein or glutelin or a water absorbent resin. If a film made of synthetic resin is added to the conventional foam plastic cold box for agricultural and marine products as described above, separation is difficult, but with the cold box for agricultural and marine products made of natural materials such as paper of the present invention. If so, it is easy to separate the synthetic resin from the film, so that it is easy to remove surface stains during the material recycling process.

[0020]

FIG. 6

By covering the surface with a film of a synthetic resin or an aqueous solution or emulsion of a sizing agent, it has the effect of increasing the strength in addition to the water-repellent treatment and waterproofing, and also tends to occur in molded articles made of natural fibers. Generation of fiber powder can also be prevented. By using a method of applying or spraying an aqueous solution or an emulsion in which minute solids are dispersed, it can be disintegrated with a pulper and reused as paper or the like. Also, the surface is dipping with a synthetic resin film,
Alternatively, in the case of a method of covering the surface with a skin pack or a Breester pack, it is possible to separate the materials by breaking the synthetic resin film on the surface after use. In this case, if the perforations 62 are provided on the surface of the synthetic resin film 61 as shown in FIG. 6, the separating operation becomes easier.

[0022]

The cold box for agricultural and marine products of the present invention is characterized by being obtained by adding water and a sizing agent to a natural fiber or a mixture of a natural fiber and a reinforcing material, followed by molding and drying. It is a cool box for marine products.

[0023]

Example 1 100% water and 20% starch paste were added to a defibrated newspaper, and the mixture was filled in a mold and dried to obtain an outer size L400.
X W315 x H140, Inner Size L350 x W267 x H1
28 cold storage boxes for agricultural and marine products with lids were obtained. The entire surface of this cold box for agricultural and marine products was skin-packed with a polyethylene film having a thickness of 75 μm.

[0024]

[Example 2] External dimensions L400 x W315 x H140 of the same dimensions as in Example 1 were obtained by foaming polystyrene beads.
A cold box for agricultural and marine products with a lid having an inner size of L350 × W267 × H128 was obtained.

[0025]

[Table 1]

[0026]

[Adiabatic test] 8 kg of fish cooled to -20 ° C was placed in each cold box for agricultural and marine products of Example 1 and Comparative Example 1, the lid was closed, and then the container was left in an environment of 20 ° C to obtain the internal temperature. Was measured over time. The test results are shown in Table 1.

[0027]

[Test Results] As can be seen from the results of the heat insulation test in Table 1, the cold insulation box for agricultural and marine products of the present invention has insulation equal to or higher than that of the cold insulation box for agricultural and marine products of the conventional foam plastic. Have sex. In addition, since recycled waste paper can be used as the material, the post-treatment such as disposal and incineration is much easier than that of conventional foamed plastic. Moreover, when the state of each cold box for agricultural and marine products after use was examined, it was found that the foamed polystyrene beads of Comparative Example 1 were soaked with fish drip even after washing with water after use. In order not to fall
The residual fishy odor was intense and could not withstand reuse. However, when the cold box for agricultural and marine products of the present invention of Example 1 was washed with water after use, it had almost no residual odor, and it seemed that it could be reused.

[0028]

[Effects] The cold box for agricultural and marine products of the present invention has a heat insulating property equal to or higher than that of the conventional cold box for agricultural and marine products made of foamed plastic. The cold box for agricultural and marine products of the present invention can be made a person who can endure repeated reuse, unlike the conventional cold box for agricultural and marine products made of foamed plastic, by providing a film of synthetic resin or the like on the surface. The cold box for agricultural and marine products of the present invention can have excellent strength by adding a reinforcing material. The cold box for agricultural and marine products of the present invention is superior to the conventional cold box for agricultural and marine products made of foamed plastic in terms of post-treatment such as disposal, incineration, reuse, and material recycling. The cold box for agricultural or marine products of the present invention can be used by treating the surface thereof with water repellent without worrying about damage due to water wetting. The cold box for agricultural and marine products of the present invention can prevent the generation of paper dust by covering the surface thereof with a synthetic resin, a paste or the like. The cold box for agricultural and marine products of the present invention, by covering the surface thereof with a synthetic resin, in the process of material recycling,
Dirt adhering to the surface can be easily removed and recycled with less energy.

[Brief description of drawings]

FIG. 1 shows one use example of the cold box for agricultural and marine products of the present invention.

FIG. 2 shows another usage example of the cold box for agricultural and marine products of the present invention.

FIG. 3 shows the state of natural fibers.

FIG. 4 shows a state of a natural fiber to which a reinforcing material is added.

FIG. 5 shows an example of skin packs on the surface of the cold box for agricultural and marine products of the present invention.

FIG. 6 shows an example in which a skin pack is also provided on the surface and perforations are provided.

[Explanation of symbols]

 1 Cold box for agricultural and marine products 10 Material 11 Lid 12 Fish 22 Fruit 31 Natural fiber 32 Reinforcing material 51 Synthetic resin and paste film 61 Synthetic resin film 62 Perforations

Claims (8)

[Claims] 1. Forming by adding water and a sizing agent to natural fiber,
Cold box for agricultural and marine products, characterized by being obtained by drying. 2. The natural fiber is a mixture of crushed and defibrated material of paper or pulp and a reinforcing material.
A cool box for agricultural and marine products according to claim 1. 3. A synthetic resin is formed on the surface of a box obtained by adding water and a sizing agent to a mixture of the natural fiber, or a crushed / defibrated material of paper or pulp, and a reinforcing material, followed by drying. Alternatively, it has a coating film of a paste.
A cool box for agricultural or marine products according to 1 to 2. 4. The cold box for agricultural and marine products according to claim 3, wherein the synthetic resin film has perforations for facilitating separation work. 5. The cold box for agricultural and marine products according to claim 3, wherein the synthetic resin is polyethylene. 6. The agricultural product according to claim 3, wherein the synthetic resin is polyvinyl alcohol.
Cold box for marine products. 7. The cold box for agricultural and marine products according to claim 1, wherein the paste is starch. 8. The cold box for agricultural and marine products according to claim 1, wherein the paste is polyvinyl alcohol.