JPS6124984B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of forming a heat insulating layer on one side of a container.

Generally, in bathtubs made by press-forming aluminum plates, stainless steel plates, enameled iron plates, etc., the thermal conductivity of the bathtub body is high, so it is necessary to form a heat insulating layer on the outer surface of the bathtub to improve heat retention. In addition, for example, in a water storage tank for a flush toilet formed by a method such as press molding, it is necessary to provide a heat insulating layer on the inner surface to prevent condensation due to the temperature difference between the stored water and room temperature. .

By the way, as a means of forming a heat insulating layer on a rigid container such as a bathtub or a water storage tank,
A method is used in which heat insulating plates are molded into shapes that correspond to each side of the container, and then these heat insulating plates are attached using adhesive, etc.; Not only does the processing cost increase, but if the dimensions of the insulation plates do not match, the work of pasting the joints is complicated, which is inconvenient for mass production.

Therefore, the inventor conducted extensive research in order to find a method of forming a heat insulating layer on one side of a rigid container, which can omit the complicated pasting work and is suitable for mass production. Focusing on the fact that it can be used as a part of a mold, a sealing insulating material is placed around the female or male mold at a predetermined position, and a sealing insulating material is placed around the female or male mold. A space of a predetermined thickness is formed between the mold and one side of the container by bringing one side of the container into close contact with an insulating material, and this space is filled with a foamable synthetic resin material such as foamable polystyrene beads. Next, it was found that the desired purpose could be achieved by foam-molding this foamable synthetic resin material using an appropriate heating means and then cooling it with water or the like.

Therefore, an object of the present invention is to provide a method for forming a foamable resin layer on one side of a container body, and in particular to use one side of a rigid container as a part of a mold, thereby simplifying the manufacturing process and improving the quality of the product. The aim is to reduce manufacturing costs.

In order to achieve the above object, in the present invention, an air permeable partition wall having the same shape as a pre-formed rigid container body is provided on one side of a closed casing that can be freely approached and separated to define two rooms, The air permeable partition wall is used as one mold and a predetermined space is provided on one side thereof, and the rigid container body is used as the other mold and fixed to the other sealed casing via an insulating material at the peripheral edge,
A foamable synthetic resin material is filled into the space of the mold consisting of the air-permeable partition wall and the container body, and the foamed synthetic resin material is passed through a supply pipe inserted into both chambers partitioned by the air-permeable partition wall of the sealed casing. The method is characterized in that the foamable synthetic resin material is foam-molded by supplying pressurized steam, and then is cooled by supplying cooling water from a supply pipe.

Next, as a preferred embodiment of the method for forming a heat insulating layer on one side of a container according to the present invention, a method for forming a heat insulating layer on the outer surface of a bathtub will be illustrated, and the attached drawings will be referred to in relation to the apparatus. This will be explained in detail below.

In FIG. 1, a mold 10 used to carry out this method engages with a female mold 14 that holds a bathtub body 12 fixedly in a face down state formed by means such as press working. An insulating material 18 made of rubber or the like is provided at a predetermined position on the opening edge of the female mold 16, and when the male mold 14 and the female mold 16 are engaged, the male A space 20 having a predetermined thickness is formed between the outer surface of the bathtub body 12, which constitutes a part of the mold 14, and the inner surface of the female mold 16. Next, the interior of the space 20 is filled with pre-foamed polystyrene beads 24 via the raw material supply pipe 22, and steam is supplied from the supply pipe 26 to fill the interior of the female mold 16 and through the numerous through holes 28. The polystyrene beads 24 are foamed by maintaining the space 20 communicating with the inside at a predetermined temperature and pressure. In this case, if steam is supplied to the inside of the bathtub body 12, which constitutes a part of the male mold 14, through the supply pipe 29 and heated, the polystyrene beads 24 can be foamed uniformly and quickly. suitable.

After the polystyrene beads 24 are foamed and kept in shape along the wall surface of the space 20 in this way, water is injected from the supply pipes 26 and 29 instead of steam to partially form the female mold 16 and the male mold 14. By cooling the constituent bathtub body 12, the heat insulating layer 30 foam-molded in the space 20 is stabilized, and the male mold 1
4 and the female mold 16 and remove the bathtub body 1.
By removing 2, a bathtub 32 with a heat insulating layer 30 integrally formed on the outer surface is obtained (the second
(see figure).

As described above, according to the method of the present invention, the bathtub body is used as a part of the male mold, and the heat insulating layer is integrally formed on the outer surface of the bathtub body, thereby omitting the work of forming and pasting heat insulating plates corresponding to each side. Therefore, it is possible to reduce manufacturing costs and improve heat retention.

Further, in FIGS. 3 and 4, a mold 10 is formed by a female mold 36 that fixes and holds a water storage tank body 34 of a flush toilet or the like in a face down state, and a male mold 38 that engages with this female mold 36. , when the insulating material 18 is disposed on the lower peripheral edge of the male die 38 and the male die 38 and the female die 36 are engaged, the inner surface of the water storage tank body 34 constituting a part of the female die 36 and the male die are connected. This is another embodiment of the method of the present invention in which a space 20 is formed between the mold 38 and the outer surface of the mold 38, and the polystyrene beads 24 are foamed within this space 20 to form a heat insulating layer 30 on the inner surface of the water storage tank 40. However, in this case, manufacturing costs can be reduced and dew condensation can be reliably prevented.

As mentioned above, according to the method of forming a heat insulating layer on one side of a container according to the present invention, one side of the rigid container is used as a part of the mold, and the heat insulating layer is integrally formed. Therefore, the manufacturing process can be simplified and the manufacturing costs of the manufacturing equipment and products can be reduced. Further, it has various advantages such as the ability to easily adjust the thickness of the heat insulating layer obtained by appropriately adjusting the thickness of the insulating material.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and it goes without saying that any design changes can be made without departing from the spirit of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional explanatory view of an apparatus for carrying out a method of forming a heat insulating layer on the outer surface of a bathtub using the method of the present invention, and FIG. 2 is a perspective view of a bathtub obtained by the apparatus shown in FIG. Fig. 3 is a cross-sectional explanatory diagram of an apparatus for implementing a method of forming a heat insulating layer on the inner surface of a water storage tank using the method of the present invention, and Fig. 4 is a perspective view of a water storage tank obtained by the apparatus shown in Fig. 3. It is a diagram. 10... Mold, 12... Bathtub body, 14...
...Male type, 16...Female type, 18...Insulating material, 20...
... Space, 22 ... Raw material supply pipe, 24 ... Polystyrene beads, 26 ... Supply pipe, 28 ... Through hole, 2
9... Supply pipe, 30... Heat insulation layer, 32... Bathtub, 34... Water storage tank body, 36... Female type, 3
8...Male type, 40...Water tank.

Claims (1)

[Claims] 1. An air permeable partition wall having the same shape as the pre-formed rigid container body is provided on one side of the sealed casing that can be freely moved in and out. 2.
The air permeable partition wall is used as one mold to provide a predetermined space on one side of the chamber, and the rigid container body is used as the other mold to seal the other through an insulating material at the periphery. A foamable synthetic resin material is fixed to the casing and filled in the space of the mold consisting of the air-permeable partition wall and the container body, and inserted into both chambers of the air-tight casing separated by the air-permeable partition wall. A heat insulating layer is formed on one side of the container, characterized by supplying pressurized steam through a supplied supply pipe to foam-mold the foamable synthetic resin material, and then cooling it by supplying cooling water from the supply pipe. how to.