JP2548276Y2 - Sheet material for rice container interior and rice container - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet material for the interior of a container used for storing or transporting rice, and particularly to a method of effectively capturing water vapor that is condensed and condensed on the inner wall of the container. The present invention relates to an interior sheet material designed to prevent water wetting, to facilitate the peeling of rice, and to prevent fiber waste and the like from entering foreign matter as foreign matter.

[0002]

2. Description of the Related Art Recently, cooked rice is sold as a product from a specialty rice cooker for schools, hospitals, canteens and schools of various public organizations, restaurants, hotels, inns, etc. (hereinafter referred to as consumers). It has become. In other words, the rice cooker was originally supposed to be performed individually by the restaurant, but under the following conditions, a business specializing in rice cooker acted on behalf of this, and the business of selling rice as a product It is increasing rapidly.

Improving and stabilizing the taste of rice not only depends on the type and storage period of rice, but also on water quality,
The amount of water, the water temperature, the heating rate during rice cooking, and the conditions of heat retention after cooking are delicately changed, so even a cooking expert can always cook the best rice according to the quality of rice. Not exclusively. However, if only the rice cooker is specialized independently, centralized management becomes possible, and high-quality rice can be supplied stably.

[0004] From the viewpoint of the customer , the rice cooking equipment and the efficiency of the rice cooking work become unnecessary, so that the rice cooking related equipment and the working space in the cooking place become unnecessary, so that not only the whole working space becomes large, but also the rice cooking work is troublesome. So you can concentrate on specialized cooking tasks.

[0005] When cooking rice that eliminates the problem of wastewater pollution, a large amount of organic wastewater is generated by washing rice and washing in a kettle, but these are actually discarded untreated on a personal basis of food and beverage companies. May cause water pollution. However, when the rice cooking operation is intensively performed by a rice cooker, purification of organic wastewater generated in large quantities becomes possible, and the problem of water pollution is also solved.

[0006] By the way, rice cooked by a rice cooker is packed in a transport container and immediately delivered to the customer. The most important thing here is how to prevent deterioration of the rice during storage or transport. And deliver it with the freshly cooked taste.

[0007] Under such circumstances, the greatest factor that reduces the taste of rice is water wetness due to dew condensation water. That is, since the cooked rice is high in temperature and contains a large amount of water, a large amount of steam is generated. Therefore, even if considerable heat retention measures are taken, the generation of dew condensation due to the temperature difference from the outside air is unavoidable, and the generation of dew condensation lowers the partial pressure of steam in the gas phase in the container, generating new steam. A vicious cycle of generation → condensation → steam generation leads to an increase in dew condensation water. If the dew water accumulates on the side wall or bottom of the storage container or the transport container, the rice in this portion becomes wet. For this reason,
Phenomena such as swelling and stickiness, becoming dango-like, and deteriorating in taste occur, and sometimes the reproduction of bacteria is started, and the commercial value is lost in a short time.

As means for preventing water wetting by condensed water, for example, JP-A-59-11814, JP-A-55-123325, and JP-A-60-1888515.
Nos. 61-12431 and 61-12722 disclose a water-absorbent laminated structure containing a water-absorbent resin-containing layer attached to the upper lid of a container, or a sheet-shaped laminated structure. There has been proposed a method of covering over the content (rice) to thereby absorb and retain dew water.

However, the water wetting by the dew condensation water in the container used for storing or transporting the rice as intended in the present invention mainly occurs on the side wall surface side of the rice container. It is not possible to prevent the rice from getting wet on the side wall surface only by covering the above water-absorbing sheet material.

[0010]

[Problems to be Solved by the Invention] The present invention has been made in view of the above-mentioned circumstances, and its purpose is to attach to the inner wall side of a rice container so that it can be stored or transported. More effectively prevent the water from getting wet due to the dew condensation water and maintain the taste of the rice immediately after cooking, and without leaving the rice sticking around when removing the rice and leaving much of the rice Another object of the present invention is to provide an interior sheet material and a rice container that do not have a risk of mixing a water-absorbing polymer substance or the like into rice.

[0011]

Means for Solving the Problems The constitution of the present invention, which has achieved the above object, comprises a hydrophilic film having a water absorbing and retaining capacity of 500 g / m ² or more on one side of the water-impermeable film. The gist is that a nonwoven fabric layer composed of a fibrous layer and a heat-fusible hydrophobic fiber is successively provided, and the surface of the nonwoven fabric layer is heat-set to eliminate fluff. The sheet material is formed such that the hydrophilic fiber layer and the nonwoven fabric layer are formed in a band shape on one side of the water-impermeable film, and the band-shaped portion is located on the side peripheral surface of the rice container body. When installed inside,
It is possible to obtain a rice container excellent in the taste maintaining effect of rice and the removability of rice cake.

[0012]

The basic structure of the interior sheet material according to the present invention is shown in FIG. 1 (a plan view showing the entire structure) and FIG. 2 (A in FIG. 1).
-A line partial cross-sectional view) and FIG. 3 (partial cross-sectional view showing a state of being put into the rice container body in a bag shape), wherein 1 is a water-impermeable film layer, Denotes a hydrophilic fiber layer, 3 denotes a nonwoven fabric layer, and 4 denotes a container body.

That is, the sheet material shown in the drawing has a hydrophilic fibrous layer 2 formed on the entire surface of one side of the water-impermeable film layer 1 or a part thereof (in the illustrated example, a band at the center) and a nonwoven fabric layer formed thereon. 3, and the hydrophilic fibrous layer 2 has a water absorbing and retaining ability of at least 500 g / m ² or more by laminating pulp or water absorbing paper made of natural fibers in a layered manner. . The nonwoven fabric layer 3 is made of a heat-fusible hydrophobic fiber, and its surface is heat-set to eliminate fluff.

First, the water-impermeable film layer 1 serves as a base layer having a shape-retaining function, and at the same time, the dew condensation water retained in the hydrophilic fibrous layer 2 oozes out to the back side of the film container body to form It has a function of preventing contamination, and the type thereof is not particularly limited as long as it does not transmit water, but is preferably a polyolefin film such as polyethylene or polypropylene in consideration of strength, durability, cost, and the like. , A nylon film, a polyester film, or a paper or cloth impregnated or laminated with a water-impermeable resin. Among these, a polyethylene film, particularly a high-density polyethylene film, is particularly preferred. The preferred date of the film is 20
g / m ² or more, and a preferred thickness is 25 to 35 μm.

As the constituent material of the hydrophilic fibrous layer 2, various wood pulp or various water-absorbing papers made of hydrophilic natural fibers can be used so as to absorb and retain dew water. At least 500 for
g / m ² or more. If the water absorption capacity is insufficient, the amount of water absorbed by the hydrophilic fibrous layer 2 reaches a saturated state within a short time after rice is charged. ,
Thereafter, the ability to retain dew water is no longer exhibited, making it difficult to obtain a satisfactory taste retaining effect. In addition, since there is a limit in the water absorption retention capacity per unit amount of pulp and water absorbing paper, when forming the fibrous layer 2, the thickness and the number of superposed layers are appropriately adjusted to obtain a water absorption retention capacity of 500 g / m ² or more. It is necessary to secure

Next, the non-woven fabric layer 3 to be coated on the hydrophilic fiber layer 2 is used for the water vapor released from rice to absorb the hydrophilic fiber layer 2.
While allowing to move in the direction, it acts to enhance the peelability of the rice cake, using heat-fusible hydrophobic fibers as the material, and heat-setting the surface to eliminate fluff. Must be used.

First, the use of hydrophobic fibers as a constituent material of the nonwoven fabric layer 3 and heat setting of the surface are effective in preventing the dew condensation of the sheet material and improving the removability of the rice cake. Very important. That is, as shown in FIG. 3, the sheet material is attached inside the rice container main body 4 with the nonwoven fabric layer 3 as the rice loading side. Not only adheres strongly to the nonwoven fabric layer 3 and makes it difficult to peel off, but also the dew water that has passed through the nonwoven fabric layer 3 and is absorbed and retained by the hydrophilic fibrous layer 2 oozes out again to the nonwoven fabric layer 3 side and the rice There is a risk of getting wet. However, when hydrophobic fibers are used, re-transfer of dew water in the rice direction is prevented, and the releasability of the rice is also improved.

Further, even if the non-woven fabric is made of a hydrophobic fiber and has not been subjected to any surface treatment, the fluffed portion on the surface is pulled out when the rice is peeled off by biting into the rice, and the inside of the rice is removed. May be mixed into
However, if the surface of the nonwoven fabric layer 3 is heat-set and the fluff is softened or melted and fused to the nonwoven fabric surface, the above-mentioned problem does not occur at all, and the fluff is prevented from being mixed into the rice. In addition, the peeling of rice becomes easy. Therefore, in order to enable such heat setting of the surface, it is essential that the nonwoven fabric layer 3 be made of heat-fusible fibers.

In addition, since the nonwoven fabric layer 3 has a myriad of inter-fiber voids and the fibers are hydrophobic, the water vapor released from the rice quickly moves toward the hydrophilic fibrous layer through these voids. Therefore, on the surface of the nonwoven fabric layer 3, the dew condensation phenomenon which may occur in the non-perforated portion of the perforated film as shown in the conventional example hardly occurs. In addition, the surface of the heat-set nonwoven fabric layer 3 is formed by innumerable fibers interlaced and partially fused, and has a myriad of irregularities on the surface as compared with a polyethylene film or the like. It is considered that the compound exerts an extremely effective effect in suppressing the adhesion of the particles and increasing the releasability.

The type of the heat-fusible hydrophobic fiber material for such a purpose is not particularly limited as long as it exhibits heat-fusibility, but is preferably a polyolefin such as polyethylene or polypropylene. Thermoplastic resin fibers such as fibers. Further, a core-sheath type composite fiber in which a core material such as polyamide or polyester is coated on its outer periphery with a polyolefin such as polyethylene is also awarded as a preferable heat-fusible fiber. The basis weight of the nonwoven fabric layer 3 made of these heat-fusible fibers is preferably 15 to 50 g / m ² , more preferably 20 to 30 g / m ² .

The width of the nonwoven fabric layer 3 provided on the hydrophilic fibrous layer 2 is slightly wider than that of the hydrophilic fibrous layer 2, and the side edges thereof are impermeable to water impermeable film as shown in FIG. It is preferable to join (joint portion is denoted by B) with the first non-water-permeable film layer 1 and the hydrophilic fiber layer 2 so that the hydrophilic fiber layer 2 is completely wrapped. The integrity of the laminated structure as a whole 2 and the non-woven fabric layer 3 is increased, and the strength of the interior sheet material can be increased, handling becomes easy, and the interior sheet material is partially removed when scooping rice. It is preferable because it does not break.

The basic structure of the interior sheet material according to the present invention is as described above. In addition, for example, as shown in FIG. 4, a pulp 2a made of a hydrophilic fiber is suitably formed on a water-impermeable film 1. Spread it to the appropriate thickness, and water absorbent paper 2 on it
The water-absorbing holding layer may be formed by adding b, and a nonwoven fabric layer 3 whose surface (upper surface side) is heat-set thereon may be provided thereon. When the sheet material is applied to the inside of the rice container main body, the hydrophilic fiber layer 2 and the nonwoven fabric layer 3 are arranged on the side peripheral surface of the rice container main body 4 as shown in FIG. It is preferable to have a single-layer structure of only the water-permeable film layer 1. The reason is that if a hydrophilic fibrous layer is attached to the bottom side of the container body 4, the dew water that has migrated to the fibrous layer on the bottom side and absorbed and held is squeezed by the weight of the rice. This is because there is a danger that the rice may ooze upward and get wet with water.

When the inner surface side of the rice container main body 4 is washed and used each time, the water-impermeable film layer 1 provided on the bottom side can be omitted. On the other hand, the water-impermeable film layer 1 extended above the side peripheral surface portion of the rice container main body 4 may be folded inside so as to cover the surface after filling with rice, but the folded portion is also hydrophilic. It is preferable to form the fibrous layer 2 and the nonwoven fabric layer 3 because the evaporated water can be absorbed and held even from the upper surface side.

[0024]

[Effects of the Invention] The present invention is configured as described above, and its effects are summarized as follows. Since the water does not get wet due to the dew condensation water and does not occur, the taste of the rice can be maintained at a high level for a long time. Since the hydrophilic fibrous layer and the nonwoven fabric layer also function as a heat insulating layer, heat retention is improved. The portion in contact with the rice is constituted by a non-woven fabric made of hydrophobic fibers, and the surface thereof has been made free of fluff by heat setting. Therefore, there is no danger that the rice dust will adhere to the rice and there is no risk that fiber waste will be mixed into the rice. Since the hydrophobic nonwoven fabric layer exists between the hydrophilic fiber layer and the filled rice, there is no danger that the dew water trapped by the hydrophilic fiber layer will migrate again in the rice direction.

[0025]

Example 1 Example of a rice container body made of polypropylene [inner dimensions: width 300]
mm × length 380 mm × height 180 mm], a bag-shaped interior sheet having a structure shown in FIG.

That is, a central part of a polyethylene film having a thickness of 30 μm and a width of 200 mm and a basis weight of 25 g / m ² (water absorption capacity: 1
Five sheets of 30 g / m ² ) water-absorbing paper are superimposed, and the surface of a non-woven fabric made of a heat-fusible hydrophobic fiber having a core-sheath structure composed of polyester as a core material and polyethylene as a sheath material is placed at 130 ° C.
After heat-setting with a heat roll to remove the fluff (basis weight: 25 g / m ² ), the periphery of the nonwoven fabric is wrapped as described in FIG. The film was heat-fused to a polyethylene film (or bonded using a hot-melt adhesive made of an ethylene-vinyl acetate copolymer) to be integrated.

Then, both ends in the longitudinal direction are heat-sealed to form a cylinder, and the lower end is also heat-sealed to finish in a bag shape.
Further, the lower portion of only the polyethylene film was bent to form a rectangular shape as shown in FIG.

This was filled with cooked rice, covered and left at room temperature (25 ° C.). After 10 hours, when the lid was removed and the state of the rice was observed, the rice was in a good condition without being sticky or dango-like in any part of the container, had no bad smell, and was delicious. The taste (taste) was almost the same as the one at the time of cooking.

Further, when the rice was taken out by rice scooping, it was extremely easy to separate the rice from the sheet material, and no mixing of fiber waste into the rice was observed.

COMPARATIVE EXAMPLE 1 A similar interior bag was prepared by using only a polyethylene film without using water-absorbing paper and nonwoven fabric in the above-described example.
The same experiment as above was performed using this as an interior material.

Comparative Example 2 The experiment was performed in exactly the same manner as in Example 1 except that a non-woven fabric made of hydrophilic rayon fiber was used as the non-woven fabric (the fiber was not heat-fusible, so the surface could not be heat-set). Was done.

Comparative Example 3 A bag-like interior sheet material was prepared in exactly the same manner as in Example 1 except that the heat setting of the surface of the nonwoven fabric was omitted and the nonwoven fabric was used while being fluffy, and a rice preservation test was performed in the same manner. Was.

Comparative Example 4 A bag-like interior sheet material was prepared in the same manner as in Example 1 except that only one piece of water-absorbing paper constituting the hydrophilic fibrous layer was used (water absorption retention capacity: 130 g / m ² ). They were prepared and subjected to a rice preservation test in the same manner.

Comparative Example 5 A bag-like interior sheet material was prepared in the same manner as in Example 1 except that synthetic paper made of non-water-absorbing synthetic fiber (polypropylene) was used instead of water-absorbing paper. A rice preservation test was carried out by the method described above.

The results are collectively shown in Table 1. The results obtained by using the interior sheet materials of Comparative Examples 1 to 5 were as follows: the state of the rice after storage for 10 hours, the odor, the taste, and the peelability of the rice. There was a problem with crabs, which could not fulfill the purpose of the present invention.

[0036]

[Table 1]

[0037] State of rice: 〇: good ×: sticky and dango-like odors are observed. No change from the time of cooking. × ・ ・ ・ The taste has clearly changed. Peelability of rice: △ ・ ・ ・ No adhesion × ・ ・ ・ Adhesion

[Brief description of the drawings]

FIG. 1 is a plan view illustrating an interior sheet material according to the present invention.

FIG. 2 is a partial sectional view corresponding to the line AA in FIG. 1;

FIG. 3 is a partial cross-sectional view showing a state in which a sheet material for interior is housed in a rice container main body.

FIG. 4 is a partial cross-sectional view showing another laminated structure of the interior sheet material according to the present invention.

FIG. 5 is an explanatory diagram of the interior sheet material used in the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Non-water-permeable film layer 2 Hydrophilic fiber layer 3 Non-woven fabric layer 4 Rice container main body

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Miyuki Mitsuhashi 2-25, Yukiura, Kanazawa-ku, Yokohama-shi Inside Mitsuhashi Co., Ltd. (72) Inventor Matahisa 2-25, Yukiura, Kanazawa-ku, Yokohama-shi Mitsuhashi Corporation (72) Inventor Hiroshi Odanaka 1-2-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Shokubai Tokyo Head Office (72) Inventor Masakazu Tanaka 1-2-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Shokubai Tokyo In-house (56) References Japanese Utility Model 2-9887 (JP, U) Japanese Utility Model 2-29722 (JP, U)

Claims (3)

(57) [Scope of request for utility model registration] 1. A non-woven fabric layer comprising a hydrophilic fiber layer having a water-absorbing and retaining ability of 500 g / m ² or more and a non-woven fabric layer comprising heat-fusible hydrophobic fibers are sequentially formed on the entire surface or a part of one side of a water-impermeable film. An interior sheet material for a rice container, wherein the surface of the nonwoven fabric layer is heat-set to eliminate fluff. 2. The interior sheet material according to claim 1, wherein the hydrophilic fibrous layer and the nonwoven fabric layer are formed in a strip shape on one side of the water-impermeable film. 3. A rice container, wherein the interior sheet material according to claim 2 is attached to a rice container main body such that the band-shaped forming portion comes to a side peripheral surface portion of the rice container main body.