JPS602867A - Manufacture of inner box for refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] This invention: When manufacturing an inner box for a refrigerator etc. that has a freezer compartment and a refrigerator compartment, sheets with different wall thicknesses are used for the freezer compartment side and the refrigerator compartment side, respectively. The present invention relates to a method for manufacturing a refrigerator inner box, which is vacuum-formed separately and simultaneously as one body using shaped materials.

FIG. 1 is a perspective view showing an outline of the structure of a refrigerator inner box manufactured by a conventional manufacturing method. In the figure, (13 is the freezer compartment, (2+ is the refrigerator compartment, (3) is the refrigerator compartment, the inner box of the refrigerator with a refrigerator compartment, (4) is the recess for holding the cooler, and (5) is the food etc. Shelf rails for placing items, (6)
(7) is the reinforcing adhesive tape, and (7) is the partition between the freezer and refrigerator compartments.

Conventionally, the material for vacuum forming has been a sheet-like thermoplastic synthetic resin material with uniform thickness. When vacuum forming such materials, the inner box (3) of the refrigerator has complex irregularities such as a recess (4) for holding the cooler and shelf rails (5) for placing food etc. Since it has a large number of parts, the bending parts such as corner parts are thin and have a disadvantage of being weak in strength. For this reason, it was necessary to take measures such as attaching reinforcing adhesive tape (6 layers) to the inner box molding material at the thinner parts.This increased extra work steps and hindered mass production. In addition, the elongation rate per unit area of the sheet material when forming the freezer compartment +11 and the refrigerator compartment (2) was much larger in the freezer compartment (1) than in the refrigerator compartment (2). When setting the wall thickness of the material, the material was selected based on the thin wall part of the freezer compartment (1). Therefore, the thickness of the freezer compartment (11) was appropriate because it has a good elongation rate, but The refrigerator compartment (2) had a major drawback in that the elongation rate was small, resulting in a product that was thicker than necessary, resulting in excessive quality and wasted material.

This invention was made in order to eliminate the drawbacks of the above-mentioned conventional manufacturing methods, such as uneven quality and wasted material. The next step is to use the molding material more effectively and appropriately by performing vacuum forming by applying separate sheet materials with different wall thicknesses to the refrigerator compartment side, where the elongation rate of the material is small, and to the cold room side, where the elongation rate of the material is small. An embodiment of the invention will be described in detail with reference to the drawings.

FIG. 2 is a cross-sectional view of a vacuum forming machine showing an embodiment of the method for manufacturing a refrigerator inner box according to the present invention, and FIG. 3 is an enlarged view of a joint between materials of the inner partition.

The refrigerator inner box (3) is integrally formed through a partition part (c) that partitions the freezer compartment (1) and the refrigerator compartment (2).

First, the molding material for the inner box (3) is the freezer compartment +11111,
Separately installed in the refrigerator compartment (2+01+1), sheet-shaped wood (8a) on the freezer compartment side and sheet-shaped material (8b) on the refrigerator compartment side.
) is to set the appropriate wall thickness for each rod. The joint part (9) of these sheet materials (8a) and (8b) is provided in the partition part (7) that partitions the above-mentioned compartment.These sheet materials (8a) and (8b) are It is made of plastic synthetic resin, and the peripheral edge of the above material is clamped by a clamping device tlO.
J to hold it tightly and attach it so as to close the upper opening of the female mold 1111 for vacuum forming. In this state, the material (8
a) and (8b) from the top surface using a heater etc.
Heat it to about 20℃ to make it soft, and when they are welded to each other, open the valve @ and release compressed air from the numerous small holes 0 → opened on the inner surface of the female mold αD through the air pipe αa. The materials (8a) and (8b) are expanded as shown by the solid line in FIG. This expansion process is performed on the material (8a), (
The wall thickness of 8b) is made uniform for each chamber. Next, use the valve (2) to exhaust the inside of the female mold 01J.
Close the valve Cl51, and suck air through the air pipe 03 with a vacuum suction device to remove the materials (8a) (8b).
) is stretched downward and the male mold αQ is lowered to form the materials (8a) and (8b) along the inner wall of the female mold (111). An inner box shape is formed, and therefore, the inner box is formed by this vacuum forming.

Another embodiment of the present invention is applied to the inner body of the door body of a refrigerator, with similar great effects.

As described above, in this invention, by appropriately setting the wall thickness of the inner box in the vacuum forming chamber, it is possible to make the wall thickness uniform after the product is manufactured. This results in
It is now possible to apply adhesive tape that is attached to thin parts for reinforcement when manufactured using the conventional method, and to adjust the material thickness of the freezer and refrigerator compartments separately for each compartment. This allows us to optimize the value, bring about the maximum effect with the minimum amount of materials, and provide the lowest cost and highest quality product. Furthermore, since the joints of each material are provided in the nine partitions, the seam lines do not appear on the design surface, so there is an advantage and effect that the aesthetics are not lost from a design standpoint.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a conventional refrigerator inner box, Fig. 2 is a sectional view of a vacuum forming machine used in the method of manufacturing the refrigerator inner box of the present invention, and Fig. 3 is a partition section similarly used in the vacuum forming machine. FIG. In the figure, Fi+... Freezer compartment, (21... Refrigerator compartment, (3)... Refrigerator inner box (8a)...
Seat rope material (a), (8b)...Sheet material (b), (9)...Joint part, (10)...
...Clamp device, (11)...Female type,
・−・Valve, α3・・・Air pipe, ←→・・
...Small hole, (lO...Valve, (16)
...It is a male type. Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent Masuo Oiwa and 2 others

Claims (1)

[Claims] (1) In a manufacturing method in which the inner box of a refrigerator with a freezer compartment and a refrigerator compartment is molded from a synthetic resin material, the inner box for the freezer compartment and the refrigerator compartment box are selected to suit the structural dimensions of each compartment. A method for manufacturing a refrigerator inner box, characterized in that sheet materials having different wall thicknesses are divided and used for a freezer compartment and a refrigerator compartment, and then vacuum formed. (21) When sheet-like materials with different wall thicknesses are divided and used for freezer compartments and refrigerator compartments, the partition is made into a joint of the sheet-like materials with different wall thicknesses. A method for manufacturing a refrigerator inner box according to claim 11.