JPH0457951B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a method of manufacturing a heat insulating box in which the space between the inner and outer boxes is filled with a foamed heat insulating material.

(B) Prior Art The resin foam insulation box shown in the specification and drawings of U.S. Patent No. 3,132,382 includes a mold for molding the resin foam under pressure, and the mold forms a closed cavity. an apparatus comprising a wall having a top wall, the top wall having an injection hole, and a flexible tube attached to the injection hole for injecting foamed resin into the mold; The tube is suspended freely within the mold away from the bottom of the mold, and the tube is hermetically permanently affixed to the rim of the injection hole, the lower end of the tube being suspended by the foam resin during expansion of the mold. A configuration is provided which folds laterally to flatten when brought into contact with each other to seal the injection hole.

(c) Problems to be Solved by the Invention In the above-mentioned prior art, the lower end of the flexible tube through which the foamed resin stock solution passes is far away from the bottom of the mold, so that the foamed resin stock solution that has passed through the tube does not flow into the mold. It is then injected into a predetermined position with some of it being diffused within the mold and attached to opposing walls within the mold. For this reason, the stock solution starts foaming from the bottom of the mold, and the foaming of the stock solution that adheres to the opposing walls inhibits the foaming of the stock solution poured into the bottom, resulting in significantly uneven foaming density. result in That is, partial foaming caused by diffusion of the stock solution causes density variations in the foamed resin within the mold, resulting in problems such as so-called shrinkage in which the walls deform as the foamed resin shrinks. In addition, the flexible tube has a foamed resin that comes into contact with its lower end.
In order to double as an injection hole cap when folded horizontally and flattened to close the injection hole, the folded tube becomes a baffle material that inhibits the growth of the foamed resin foaming in the mold, and prevents foaming near the tube. Not only does the resin flow poorly and there is a risk of honeycomb formation, but air remains within the tube, causing the problem that the insulation effect of the foamed resin near the tube deteriorates. Furthermore, since the flexible tube is folded horizontally when it comes into contact with the foamed resin, if it is installed laterally, that is, in the front-rear direction or left-right direction, it will bend due to the weight of the stock solution passing through it. There also arises the problem that the stock solution cannot be injected into a predetermined position.

(d) Means for Solving the Problems The present invention provides an insulating box body in which a foaming solution of a foaming insulation material is injected into the space between the inner and outer boxes and solidified by foaming, in which an injection hole is formed in the outer box and , an insulating hard pipe is arranged in the space so that one end opening faces the injection hole, an injection gun for injecting the stock solution faces the one end opening of the hard pipe, and the stock solution is passed through the hard pipe. After injecting into the space, the injection gun is removed from the injection hole, and the foam is solidified into the space.

(E) Function When the foaming solution of the heat-generating insulation material is injected into the hard pipe using an injection gun facing the opening at one end of the hard pipe, the foaming solution is guided by the hard pipe to the position at the other end. , foaming starts from that position.

Since the foaming solution enters the rigid pipe and foams, the rigid pipe is also filled with foamed insulation material after foaming is completed, and the insulation performance of the insulation box is not impaired. In addition, after foaming is completed,
Since the hard pipe itself is hard, it also serves to reinforce the insulation box.

(f) Examples Examples of the present invention will be described below based on the drawings.

1 shown in FIGS. 9 to 11 is a box body, and this box body has an inner box 2 made of metal with an opening on the top, an outer box 3 made of metal with an opening on the top, and connects both the inner and outer boxes to each other. It is assembled with an annular connecting member 4 made of resin.
The inner box consists of a bottom wall 2A and four side walls 2B to 2E, front, back, left and right, rising from the peripheral edge of the bottom wall,
Flanges 2BF to 2EF that contact one side of the connecting member 4 are formed at the upper end of each side wall. Also, like the inner box, the outer box is composed of a bottom wall 3A and four side walls 3B to 3E on the front, back, left, and right sides rising from the peripheral edge of the bottom wall. Contacting flanges 3BF to 3EF are formed.
The connecting member is composed of narrow long sides 4A and 4B that face each other on the one hand and wide short sides 4C and 4D that face each other on the other hand, and has a U-shape in longitudinal section. An opening 5 of the box body 1 is defined on the circumferential surface. Reference numeral 6 denotes a space formed by assembling both the inner and outer boxes 2 and 3 by the connecting member 4, and includes a bottom area 6A between the bottom walls 2A and 3A of the two boxes, and a bottom area 6A between the bottom walls 2A and 3A of the two boxes, and a space between the bottom walls 2A and 3A of the two boxes, and the side walls 2B to 2.
E, each area 6B to 6E on the front, back, left and right between 3B and 3E
The thickness of both the front and rear sections 6B, 6C located directly under the long sides 4A, 4B of the connecting member 4 is the thickness of both the left and right sections 6D, located directly under the short sides 4C, 4D.
It is thinner than the thickness of 6E. Injection holes 7A and 7B are formed at the center of both ends of the front wall 3B of the outer box 3, and face both the left and right areas 6D and 6E of the space 6. 8
A and 8B are exhaust holes formed in large numbers on both long sides 4A and 4B of the connecting member 4, and are provided in both the front and rear areas 6 of the space 6.
B, facing 6C. The exhaust holes are on the long sides 4A and 4B.
The number of pieces decreases progressively from the center to both ends. 8C and 8D are exhaust holes formed in the inner walls of the short sides 4C and 4D of the connecting member.

14, 14 are left and right side walls 3D, 3E of the outer box 13
A hard cylindrical pipe attached to the inner surface of the pipe with adhesive tape 15, which has heat insulation properties and whose wall surface is made of a resin such as polycarbonate with low viscosity, that is, a glossy surface, and the rear end is lower than the front end. As shown in FIG.
It faces A and 7B with a gap L between them. It is preferable that these two pipes have a length of 1/2 or more of the yellow line dimension M of both the left and right sections 6D and 6E of the space 6, that is, the length of both pipes is such that the rear end extends to the vicinity of the injection point of the foaming stock solution, which will be described later. are doing. 16 is injection hole 7
A plate-like self-closing cap made of paper or soft resin is attached to the inner surface of the front wall 3B of the outer box 3 with adhesive or adhesive tape so as to cover A and 7B, and has an H-shaped notch as shown in Fig. 3. two movable tongue pieces 16A,
16B is formed. Both tongues are pushed open by an injection gun, which will be described later, as shown by the solid lines in Figure 4, and after the foaming stock solution is injected, they return to the state shown by the chain lines due to their own elasticity, and are then expelled by the foaming pressure of the foam insulation material. It is pushed in the direction of the box 3 and closes the injection holes 7A and 7B.

As shown in FIGS. 1, 2, and 5 to 7, the box is fixed using both inner and outer jigs 9 and 10 that have been heated to an appropriate temperature in advance, and then subjected to a foaming operation.
The inner jig is inserted into the inner box 2 and has an exhaust hole 8.
It consists of a core part 9A formed with exhaust passages 11C and 11D communicating with the exhaust holes 8A and 8D, and an annular part 9B formed with exhaust passages 11A and 11B facing the connecting member 4 and communicating with the exhaust holes 8A and 8B, It is suspended from a support device (not shown) via an arm 9C so as to be able to rise and fall freely. Further, the outer jig is a substrate 1 on which the box body 1 is placed.
0A, and four front, rear, left, right, and left side plates 10B to 10E that can be freely moved toward and away from each other. Among these side plates, the front side plate 10B, which faces the front wall 3B of the outer box 3, has an injection hole 7A in the center of both ends. Injection path 12 communicating with 7B
A and 12B are formed.

First, the box body 1 is placed on the base plate 10A of the outer jig 10 with the bottom wall 3A of the outer box 3 placed on the base plate 10A of the outer jig 10 with the opening 5 facing upward, and then the inner jig 9 that has descended pushes the inner box 2 and the connecting member 4. At the same time, each side wall 3B to 3E of the outer case 3 is held down by each side plate 10B to 10E of the outer jig 10 that has been raised up, and is fixed by the SF foaming method. After fixing the box 1, the injection guns 13A and 13B shown in FIGS. 1, 2, and 4 are inserted into the injection path 12.
A, 12B and injection holes 7A, 7B, and insert both tongues 16 of the self-closing cap 16 as shown by solid lines in FIG.
After pushing open A and 16B to expose both pipes 14 and 14, add a foaming solution W such as a hard polyurethane solution.
is injected through both pipes 14, 14, respectively, at two points at both ends of the bottom area 6A, which are injection drop points, as shown in FIG. As shown in FIG. 5, the injected foaming stock solution W grows toward the center from both ends of the bottom area 6A and toward the top of both the left and right areas 6D and 6E at the beginning of foaming, as shown in FIG. Then, as shown in Figures 6 and 7, in the middle stage of foaming, both the front and rear zones 6
Both pipes 1 grow towards the top of B and 6C.
4, 14, and in the late stage of foaming, the growth in both the front and rear areas 6B, 6C is the same as in the left and right areas 6D, 6.
During this time, the foaming solution has almost caught up with the growth of E, and during this time, the foaming solution goes through a cream time where it changes from liquid to foam, a gel time where the growth rate slows down due to the foam, a tack-free time where the adhesive strength weakens, and a foam time where the growth stops and solidifies, and then it becomes foamed insulation material. It becomes W′. On the other hand, foam pipe W
With the growth of the space 6 and both pipes 14, 14
Due to the foaming pressure, the air and fluorocarbon gas inside passes through the self-closing cap 16, the injection holes 7A, 7B, and the injection paths 12A, 12B in the early stage of foaming, and also passes through the 5th, 6th, and As shown by the arrows in the figure, exhaust holes 8A, 8B, 8C, 8D and exhaust passages 11A, 11
It is gradually pushed out from B, 11C, and 11D. After forming the foam insulation material W′, both the inner and outer jigs 9 and 1
By removing 0, the insulation box 1' is completed as shown in FIG.

According to this manufacturing method, the pipes 14, 14 through which the foaming stock solution W passes have one end close to the injection holes 7A, 7B, respectively, with a gap L, and the other end at the point where the foaming stock solution W is injected and falls. Due to the proximity, pipe 14,
14 indicates a space 6 for the foaming stock solution W during injection.
The foaming solution W can be placed in a designated position to prevent it from spreading inside.
can be injected. As a result, foaming of the foaming solution W starts from a predetermined position in the space 6 and its growth becomes good, so that a foamed heat insulating material W' having a uniform foaming density can be formed. Also, pipe 14,1
Since one end of 4 is close to the injection holes 7A, 7B with a gap L and opens into the space 6, as the foaming stock solution W foams, the foaming stock solution enters into the pipes 14, 14, and this foaming stock solution W is foamed. The air in both pipes is pushed out and the foam insulation material W' is filled in the same way as the space 6, and the gap L between the pipes 14, 14 and the injection holes 7A, 7B is also filled with foam insulation material. material
W′ is filled. As a result, even if the pipes 14, 14 are arranged in the space 6, there will be no hindrance to the growth of the foaming solution W and the discharge of air.
It is possible to avoid air remaining in the space 6 and the formation of honeycomb portions due to this air remaining. Furthermore, pipe 1
Reference numerals 4 and 14 are made of heat-insulating hard members, which are attached to the outer box 3 and filled with foamed heat insulating material W', so that after foaming, they serve as reinforcing members for the outer box 3 and provide protection against external shocks. In addition to increasing the strength of the box 3, it not only serves to prevent shrinkage caused by the shrinkage of the foam insulation material W', but also to increase the strength of the box 3.
It can be mounted in either the left or right direction, and can be easily mounted on the outer box 3, expanding its uses. In addition, pipe 14
Since it itself is hard, it also serves to reinforce the heat insulating box after foaming is completed. In particular, if this pipe 14 is arranged along the inner surface of the outer box 3, the outer box 3
The effect of reinforcement can be expected.

(G) Effects of the Invention According to the present invention, since the foaming solution is injected into the space through the hard pipe, it is possible to prevent the foaming solution from diffusing within the space and directing most of the foaming solution to the predetermined foaming start position. Foam insulation material that can be injected and diffused from a predetermined foaming start position, but foaming is not inhibited or air remains in the space, resulting in smooth foaming operation and uniform density. can be obtained.

In addition, since the foaming solution enters the hard pipe and foams, the hard pipe is also filled with foamed heat insulating material after foaming is completed, and the heat insulating performance of the heat insulating box is not impaired. Furthermore, after foaming is completed, the hard pipe itself is hard, so it has the effect of reinforcing the heat insulating box.

[Brief explanation of the drawing]

The drawings all show an embodiment of the method for manufacturing a heat insulating box according to the present invention, and FIG. 1 is a sectional view taken along the line A-A in FIG. 3
The figure is an installation diagram of the self-closing cap, Figure 4 is an enlarged vertical sectional view of the main part showing the opening and closing operation of the self-closing cap, Figure 5 is a cross-sectional view taken along the line B-B in Figure 1, and Figure 6 is the line C-- C sectional view, FIG. 7 is a sectional view taken along line D-D in FIG. 1, FIG. 8 is a vertical cross-sectional view of the insulation box, FIG. The sectional view, FIG. 11, is a sectional view taken along line FF in FIG. 2...Inner box, 3...Outer box, 6...Space, 7A, 7B...
Injection hole, 14, 14...pipe, W...foaming stock solution,
W′...Foam insulation material, L...Gap.

Claims (1)

[Claims] 1. In an insulating box body in which a foamed solution of foamed insulation material is injected into the space between the inner and outer boxes and foamed and solidified, an injection hole is formed in the outer box, and an insulating hard pipe is inserted with one end opening into the injection hole. An injection gun for injecting the stock solution is placed in the space so as to face the one end opening of the hard pipe, and after injecting the stock solution into the space through the hard pipe, A method for manufacturing a heat insulating box body, in which the injection gun is removed and the foam is solidified in the space.