JPS6140908B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an insulating box using an outer box made of a fluorocarbon-resistant resin, and its purpose is to reduce the weight of the box and the strength of the bottom wall of the outer box relative to the foam insulation material. In addition, the purpose is to prevent deformation after foaming by preventing the formation of air pockets on the side wall of the outer box.

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

Reference numeral 1 denotes a flat plate-shaped outer box material made of a fluorocarbon-resistant resin, such as ABS resin. This material is fixed at the peripheral edge by a clamp device 2, and after being heated and softened by a heating source 3, a male material is formed as shown by the chain line. It is pre-tensioned by pushing up the mold 4, and by reducing the pressure between the male mold 4 and the male mold 4 using a pressure reducing means such as a vacuum puller as shown by the arrow in FIG. 2, the wall that will become the side wall is stretched. It is adsorbed to the surface and takes on the shape of an outer box. After the so-called drape forming, if the flange portion 5c is cut along the cutting line A, the side wall 5b is thinner than the bottom wall 5a, the side wall 5b is inclined in the direction of widening the mouth, the inner surface is a rough surface, and the outer surface is a glossy surface. The outer box 5 is completed.

As shown in FIG. 3, the outer box 5 manufactured in this way has an upper part of the inner surface of the side wall 5b where the foamed insulation material growing during the foaming process becomes a gel state region where the foaming growth is slow and the rising speed of the foamed insulation material is slow. Bubble contact members 6, 6 made of metal plates such as iron plates are adhered with an adhesive 7, and a horizontal bottom wall 8a, a vertical side wall 8b having a meandering cooling pipe 9 and a gas-liquid separator 9a on the outer surface. The inner box 8 is made of metal and the decorative frame 10 is made of fluorocarbon-resistant resin. At this time, the bubble contact members 6, 6 are connected to the side wall 8b of the inner box 8 and the side wall 5 of the outer box 5.
The bubble contact members 6, 6 are located at the shortest distance from b.
The tip on the outer box bottom wall 5a side is located toward the outer box bottom wall 5a from the extension line of the bottom wall 8a of the inner box 8. After fixing both the boxes 5 and 8 with the inner and outer jigs 11 and 12 with the opening facing downward, a hard polyurethane stock solution is injected between the boxes 5 and 8 through the injection holes 13 and 13.
The injected stock solution changes from a liquid to a foam during the cream time, where the foam grows quickly; the gel time, where the foam grows slowly; the tack-free time, when the foam has weak adhesion and is about to finish solidifying; and the foam time, when it solidifies and stops foaming. As the foam grows, the air between the boxes 5 and 8 and the fluorocarbon gas acting as a growth agent are removed from the vent holes 15. After the foaming process is completed, the insulation box 16 is completed by removing both jigs 11 and 12, and the bottom wall 5
In the lower part a, as shown in FIG. 4, there is formed a machine room 17 that houses a compressor, a condenser, etc. that constitute a refrigeration cycle together with the cooling pipe. The reason why the dimensions of the bubble contact members 6, 6 are made different is because the gas-liquid separator 9a acts as a growth resistance for the foamed heat insulating material 14.

According to this manufacturing method, first, when molding the outer box 5,
After the insulation box 16 is completed, the foamed insulation material 1 bears the most weight and is in a tack-free state during the foaming process.
The outer box 5 can be manufactured by increasing the wall thickness of the bottom wall 5a that is in contact with the bottom wall 5a, and by making the outer surface visible to the customer a glossy surface and the inner surface a rough surface. The strength of the foamed heat insulating material 14, which is weak, can be improved, and the wall thickness becomes thinner during molding, and due to its inclination, the distance between the vertical side wall 8b of the inner box 8 and the vertical side wall 8b of the inner box 8 becomes narrower as it goes upward during the foaming process. The strength of the side wall 5b can be improved by attaching bubble contact parts 6, 6 made of metal plates to the inner surface of the side wall 5b in advance, and the foamed heat insulating material 14 that is in a gel state on the inclined side wall 5b itself grows during the foaming process. The growth of the foam insulation material 14 along the slope is slow, and the bubbles generated in the foam insulation material 14 due to air entrainment near the shortest interval where the growth of the foam insulation material 14 is most delayed are removed by using an iron plate. Since the formed air pockets 18 are left in the contact members 6, 6 whose surfaces are rougher than the inner surface of the side wall 5, the formation of the air pocket 18 in contact with the inner surface of the side wall 5b can be prevented, and as a result, the foaming process Even if the foamed heat insulating material 14 shrinks after completion, the side wall 5 is protected by the foam contact members 6, 6.
b is not attracted to the foam insulation material side, and the side wall 5
deformation of b can be prevented.

As described above, the present invention has a side wall having a rough inner surface and a glossy outer surface, extending outwardly from a bottom wall and having a thinner wall thickness than the bottom wall, and having a metal wall on the inner surface of the side wall. A synthetic resin outer box with a wide mouth made of a fluorocarbon-resistant resin to which a bubble contact member is adhered and fixed is connected to an inner box having a vertical side wall, and the bubble contact member is connected to the side wall of the inner box and the outer box. The boxes are placed at the shortest distance from the side wall of the box, and the openings are on the bottom. Both boxes are fixed using both the inside and outside jigs, and a foam insulation material is injected between the two boxes. Since this is a manufacturing method for an insulating box that flows along the parts and fills the space between the two boxes, the outer surface of the outer box that is visible to customers is made to be a glossy surface after it is installed in a store, so that the appearance of the insulating box is improved. In addition, the strength of the bottom wall of the outer box, which bears the most weight after the insulation box is completed and is in contact with the foam insulation material in a tack-free state during the foaming process, can be improved relative to the weight and the foam insulation material. In addition to preventing cracks on the bottom wall of the outer box, the gap between the two boxes becomes the shortest, and the growth of the gel-state foam insulation material is slowed down by the slope, allowing air bubbles to form in the foam insulation material. It is possible to avoid air bubbles remaining in the contact member as a pool and trapping on the inner surface of the outer box, and furthermore, the contact member can prevent deformation of the side wall of the outer box due to shrinkage of the foam insulation material after foaming is completed. In addition, the strength of the side wall of the resin outer box can be improved by using the bubble contact member made of a metal plate, and thereby the resin outer box can be manufactured without causing any defects.

[Brief explanation of the drawing]

The drawings show an embodiment of the method of manufacturing a heat insulating box according to the present invention, and FIGS. 1 and 2 are longitudinal cross-sectional views showing the manufacturing process of the outer box, FIG. 3 is a vertical cross-sectional view showing the foaming process, and FIG.
The figure is a perspective view of the heat insulating box. 5...Outer box, 5a...Bottom wall, 5b...Side wall,
6, 6...Bubble contact member, 8...Inner box, 8b...
Side wall, 11, 12... jig, 14... foam insulation material.

Claims (1)

[Claims] 1 The inner surface has a rough surface and the outer surface has a glossy surface, and has a side wall that extends outwardly from the bottom wall and is thinner than the bottom wall, and a metal bubble contact member is adhered and fixed to the inner surface of the side wall. A synthetic resin outer box with a wide mouth made of a fluorocarbon-resistant resin and an inner box having vertical side walls are connected, and the bubble contact member is connected to the shortest distance between the side wall of the inner box and the side wall of the outer box. , and fix both boxes with the openings on the bottom side with both inner and outer jigs, inject a foam insulation material between the two boxes, and this foam insulation material flows in a gel state along the foam contact member, A method of manufacturing a heat insulating box which is filled between the two boxes.