JPH025996B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat insulating door formed by integrally foaming a foamed heat insulating material such as hard urethane foam on-site between a metal panel and a sash.

Conventionally, such a heat-insulating door is made by integrally foaming a metal door panel 2 and a synthetic resin sash 3 wrapped around its four sides with a foam insulation material 1 such as hard urethane foam, as shown in FIG. Metal reinforcing plates 4 were inserted along the length of the sash 3 on four sides to prevent warping due to the foaming heat of the urethane, changes in outside temperature, and temperature differences between the inside and outside of the refrigerator. However, in this case, inserting the reinforcing plate 4 is very time-consuming and the work is extremely difficult, and after being inserted, the reinforcing plate 4 is not sufficiently fixed to the sash 3 until the on-site integral foaming process. It may move during transportation and cause damage to the sash 3. In addition, as a countermeasure, it may be possible to mold the reinforcing plate 4 as one piece by co-extruding it with the sash 3, but it is difficult to process the V-cuts for bending the 4 corners of the sash 3, and the metal and resin The integrated co-extrusion technology with 2000 was difficult in terms of mold creation and continuous molding.

The present invention eliminates the trouble of inserting a reinforcing plate, which was a problem with the conventional example, and has good workability such as bending and V-cutting. To provide an insulating door that does not warp due to the heat of urethane foaming, changes in outside temperature, and temperature differences between the inside and outside of the refrigerator even when the space between the cabinet and the cabinet is integrally foamed on-site with a foam insulation material such as hard urethane foam. The purpose is to

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

In the figure, 5 is a refrigerator main body, and a heat insulating door 6 is provided to open and close the front surface of the main body 5.
This heat-insulating door 6 includes a door panel 7 (metal panel) made of iron plate or the like that constitutes an outer panel, and a door bag 8 (also called an inner panel) made of resin that constitutes an inner panel.
, a sash 9 that surrounds the four sides of the metal panel 7 and the door back 8, and a foamed heat insulating material 10 such as hard urethane foam that is filled in the space formed by these by integrally foaming on site. has been done. The sash 9 wound around the four sides has a thermosetting resin layer 9a such as polyester resin filled with a reinforcing material such as glass fiber on the foam insulation material 10 side, and a thermoplastic resin layer 9b such as vinyl chloride resin on the outer skin. and a notch 11 into which the door panel 7 is inserted;
A groove 13 into which a door gasket 12 can be inserted and a mounting piece 14 into which a door bag 8 is attached are formed. Further, the sash 9 is cut with a 90 degree V-cut at three corners 5 from the thermosetting resin layer 9a side facing the foam insulation material 10 by sawing or the like, leaving a part of the thermoplastic resin layer 9b as shown in FIG. 4B. 16
Then, as shown in FIG. 4C, the remaining portion 9b' of the thermoplastic resin layer 9b is heated with a heater 17, and bent while waiting for the softened roller to wrap around the four sides of the door panel 7. That's what happens.

The insulation door 6 formed as described above deforms due to the difference in linear expansion coefficient between the door panel 7 and the insulation material 10 caused by the foaming heat of the foam insulation material 10, changes in outside temperature, and the temperature difference between the inside and outside of the refrigerator. The amount of deformation can be reduced by the heat resistance and rigidity of the glass fiber-containing thermosetting resin layer 9a. The exterior is covered with a thermoplastic resin 9b that has good optics and appearance, and is not inferior to conventional ones.Also, the bending process is done by making a 90 degree V-cut 16 and heating it, leaving only the thermoplastic resin layer 9b. By doing so, bending can be easily performed. Therefore, there is no need to insert the metal reinforcing plates 4 into the four sides of the sash 3 as in the conventional case, which not only saves the effort of inserting them, but also eliminates the need for the on-site foaming process since they are extruded as one piece. Problems such as damage to the sash during transportation can also be eliminated.

As described above, in the present invention, a foam insulation material is integrally foamed on-site between a metal panel such as an iron plate and a sash made of synthetic resin, and the sash is formed with a thermosetting resin layer such as polyester resin located on the foam insulation material side. It is integrally extruded with a thermoplastic resin layer such as vinyl chloride resin located on the front side, and the same layer is V-cut from the thermosetting resin layer side, leaving only the thermoplastic resin layer at the corner, and then bent by heat processing. This is an insulating door that maintains the conventional appearance, has enough rigidity and heat resistance to withstand practical use, eliminates the trouble of inserting a reinforcing plate, and can be provided with good workability.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the main part of a conventional heat insulating door, Fig. 2 is a perspective view of a refrigerator having a heat insulating door according to an embodiment of the present invention, Fig. 3 is a sectional view of the main part of the heat insulating door, and Fig. 4A. ，
B, C, and D show a series of process diagrams for V-cutting, heating, and bending the corners of the sash. 7...Door panel (metal panel), 9...Sash, 9a...Thermosetting resin, 9b...Thermoplastic resin, 10...Foam insulation material, 15...Corner portion, 16...V cut.

Claims (1)

[Claims] 1 A metal panel such as an iron plate, an inner panel,
It consists of a sash that surrounds the outer periphery of this panel, and a foam insulation material such as hard urethane foam that is integrally foamed in the space between the panel and the sash. The thermoplastic resin layer and the thermoplastic resin layer such as vinyl chloride resin located on the front side are integrally extruded, and the layer is V-cut from the thermosetting resin layer side, leaving only the thermoplastic resin layer, and then heated. An insulated door with a corner that is bent by processing.