JPS5919122A - Molding jig for foamed body - Google Patents

Abstract

PURPOSE:To obtain a jig that will be constituted inexpensively for molding a foamed body without damaging an outer hull, by providing a molding box for housing the outer hull, a thin sheet in contact with the outer surface of the outer hull, and grains filled in the space between the thin sheet and the molding box. CONSTITUTION:In the molding jig wherein the outer hull 4 in the molding box 6 is provided, the space between the molding box 6 and the outer hull 4 will be loaded with the grains 10, and the foaming pressure of a foamable resin injected into the outer hull 5 can be born by the outer hull 5, a thin sheet 9 (e.g. a sheet of a rigid plastic, etc.) in contact with the outer hull 5 is provided, and the space between the sheet 9 and the molding box 6 is filled with the grains 10, so that the grains 10 are placed out of contact with the outer hull 4 thereby preventing the outer hull from being damaged.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a foam molding jig for receiving the foaming pressure of a foamable resin injected into an outer shell.

[Technical background of the invention]

For example, in the case of an insulated door for a refrigerator, an outer shell consisting of an outer door panel and an inner door panel is housed in a molding jig, and in this state, a urethane stock solution is injected into the outer shell and foamed. filled with urethane foam and molded. In this case, in order to prevent the outer shell from swelling and deforming due to the foaming pressure of the urethane foam foaming inside the outer shell, conventionally, a molding jig was used, such as an aluminum die-cast body, to match the shape of the outer shell. However, this method requires cutting the aluminum die-cast body, which increases the manufacturing cost of the jig.Recently, in order to deal with this, rigid molded parts have been used. A molding jig has been considered in which an outer shell is housed in a box, and a space between the molding box and the outer shell is filled with numerous particles.

[Good points about background technology]

However, with such a structure, since the granules have rigidity and are relatively hard, there is a risk that the granules may damage the outer shell when filling the granules or foaming urethane foam. was there.

[Purpose of the invention]

Therefore, an object of the present invention is to house an outer shell in a molded box,
To provide a foam molding jig which can prevent the outer shell from being damaged by the granules in filling the space between the molding box and the outer shell with the granules.

[Summary of the invention]

The present invention includes a molded box that accommodates an outer shell, a thin sheet in contact with the outer surface of the outer shell, and granules filled in a space between the thin sheet and the molded box. This feature prevents the granules from directly touching the outer shell.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

First, in Fig. 1, 1 indicates the finally obtained foam, cold #! This is an insulated door for a storage, and its outer shell 4 is composed of a flat box-shaped steel plate outer panel 2 with an open side and a plastic inner door panel 5 that closes the open surface of the door outer panel 2. However, this outer shell 4 is filled with foamed urethane 5 which is a foamable resin. The door inner side plate 3 of the heat insulating door 1 is provided with a plurality of protrusions 6a for forming door pockets and the like. Now, in FIGS. 2 to 4 showing the state of forming the heat insulating door 1, 6 is a forming box, which is constructed by combining rigid rectangular plates, and is a flat box with an open top surface. It consists of a box main body 7 and a can body 8 that closes the box main body 7 in an openable and closable manner.

The outer shell 4 is housed in the molded box 6 so that the outer surface of the door outer plate 2 is in contact with the inner surface of the box main body 7. Reference numeral 9 is a thin sheet made of hard plastic, for example, which is formed into a container shape with an open top and is fixed to the lid 8 of the molded box 6 so as to cover the open top, and the shape of the bottom is The thin sheet 9 is formed on the outer surface of the door inner side plate 3 in advance by forming the outer shell 4 so as to substantially match that of the door inner side plate 3 1-1, and with the lid 8 covering the open top surface of the box main body 7. (See Figure 3). 10 is a granular material;
This is, for example, made of open cut concrete and has a spherical shape with a diameter of 3 to 5 mm, and is tightly filled in the space between the lid 8 of the molded box 6 and the thin sheet 9.

The urethane foam 5 is then filled into the outer shell 4 in the following manner. From the state shown in FIG. 2, the lid 8 is placed over the open upper surface of the box main body 7 and fixed, and a predetermined amount of urethane stock solution is injected into the outer shell 4 from the nozzle of the urethane stock solution injection device (none of which is shown). and foam it. Then, numerous bubbles are generated in the urethane stock solution and the urethane stock solution expands, filling the entire inside of the outer shell 4 (see FIG. 6). During this foaming process, foaming pressure acts on the door outer panel 2 and the door inner panel 6 to swell and deform them, pushing up or deforming the thin wall V-) 9 in contact with the door inner panel 6. .

However, since the granules 10 are tightly packed between the thin sheet 9 and the lid 8 of the molding box 6, the granules 10 hardly move, and therefore the foaming pressure is applied to the molding box 6 via the granules 10. This suppresses swelling and deformation of the door outer panel 2 and the door inner panel 6. Then, the foamed urethane stock solution is filled in the outer shell 4 and solidified to form the foamed urethane 5. After that, the lid 8 is opened and the completed heat insulation door 1 is taken out.

As described above, according to this embodiment, the forming jig is constructed by filling the granular material 10 between the thin sheet 9 which has been formed in advance to match the shape of the outer shell 4 and the lid 8 of the forming box 6. Since the,
For example, it is possible to manufacture the granular material 1 at a lower cost than the conventional method of cutting an aluminum die-cast body.
Even if 0 is made of foamed corecrete and is relatively hard, there is no risk of the granular material 10 damaging the door inner panel 5. Moreover, especially if the structure is such that the thin sheet 9 is fixed to the lid 8 and sealed by the lid 8, and the granular material 10 is filled inside the thin sheet 9, as in this embodiment,
Since the entire granular material 10 can be accommodated and removed from the box main body 7 at once by opening and closing the lid 8, the granular material 10 can be placed directly into the space between the outer shell 4 and the molded box 6 without using the thin sheet 9. The work is much easier than filling and removing.

In the above embodiment, the thin sheet 9 is made to match the shape of the inner side panel 5 of the door, so even if the shape of the inner side panel 6 of the door is somewhat complicated, it can be applied to every corner of the irregularities. Although the granules 10 are filled, the present invention is not limited to this, and if the outer shell has a relatively simple shape, a flexible sheet such as a rubber sheet may be used as the thin sheet. good. Even with such a configuration, by filling the gap between the molded box and the rubber sheet with the granular material, the rubber sheet deforms along the shape of the outer shell and comes into close contact with the outer shell. As in the above embodiment, the molding jig can be manufactured at a low cost, and damage to the outer shell due to granules can be prevented. Moreover, even for multiple types of outer shells having different shapes, each outer shell can be manufactured at a low cost. Since the rubber sheet deforms depending on the shape of the body, it is possible to share the same molding jig.

Furthermore, in the embodiment described above, the thin sheet 9 is made of a puftastic sheet that is pre-formed to match the shape of the outer shell member 4, but the present invention is not limited to this, and the thin sheet is made of the door inner side panel itself. In addition, the outer shell is composed of a door outer panel and a flexible sheet such as polyethylene, and after the outer shell is filled with urethane foam and solidified, the inner door panel is attached to the outer door panel. good.

〔Effect of the invention〕

As described above, the present invention provides a molded box that accommodates an outer shell, a thin sheet in contact with the outer surface of the outer shell, and a granular material filled in a space between the thin sheet and the molded box. It is characterized by the fact that it is composed of
It is possible to provide a foam molding jig that can reliably prevent damage to the outer shell because the granules do not come into direct contact with the outer shell.

[Brief explanation of the drawing]

FIG. 3 is a view corresponding to FIG. 2 after injection of the urethane stock solution, and FIG. 4 is a partially enlarged longitudinal sectional view of the outer shell. In the figure, 1 is a heat insulating door (foam), 4 is an outer shell, 5 is urethane foam (foamed resin), 6 is a molded box, 9 is a thin sheet,
10 is a granular material. Applicant Tokyo Shibaura Electric Co., Ltd. jp81 Figure 2

Claims (1)

[Claims] 1. A molded box for receiving the foaming pressure of the foamable resin injected into the outer shell and housing the outer shell;
A foam molding jig comprising: a thin sheet in contact with the outer surface of the outer shell; and granules filled in a space between the thin sheet and the molding box.