JPS6078277A - Manufacture of heat-insulating box body - 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 (a) Industrial application field
E) It relates to a method of manufacturing a heat insulating box for a refrigerator or the like using a foaming method.

(b) Prior Art Generally, the S/F foaming method is a method used for manufacturing insulating boxes for large refrigerators and the like.

In this method, the box body is assembled by connecting both the inner and outer boxes with an annular connecting member, and the box body is installed on an outer jig board on the bottom wall of the outer box with the opening facing upward, and then it is hung in advance. Lower the inner jig into the inner box, press the inner box with the inner jig, then raise each side plate of the outer jig to press the side walls of the outer box, and use these inner and outer jigs to press the inner box. After fixing the body, a foaming process is performed in which a foaming agent is injected into the space between the inner and outer boxes and the foam is solidified to form a foamed insulation material. Remove it, and move on to the next process with the opening facing upward. Therefore, the S-F foaming method does not require reversing the box body when fixing the box body with the inner and outer jigs or after removing both jigs from the box body, so the rotation rate of the inner and outer jigs is reduced. It has the advantage that the foaming process can be carried out quickly.

However, in this foaming method, in order to speed up the growth of the foaming agent injected into the space of the large box, two injection holes are formed at both ends of one side wall of the outer box, and one side of the space is placed opposite each other. A foaming agent is injected at two points (two places) into both ends of the bottom area far from the injection port of the bottom wall soil of the outer box through both the left and right areas, and the air in the space is discharged from the many exhaust holes formed on each side of the connecting material. The foamed insulation material is formed by discharging fluorocarbon gas, which is a growth agent for the foaming agent, which is the stock solution of the foamed insulation material such as rigid polyurethane.In the early stage of foaming, the foaming agent is released from both ends of the bottom area in a horizontal direction, that is, from both ends of the bottom area. The other opposing area, which grows toward the center and upwards, that is, toward the top of both the left and right areas, merges in the center of the bottom area, and intersects with the blowing agent injection direction in the middle of foaming, that is, the top of both the front and back areas. Because of this, the growth of the foaming agent in the front and rear regions tends to be slower than in the left and right regions, and the foam insulation material at the top of both the front and rear regions of the space forms a so-called nest, resulting in poor foaming.

(c) Purpose of the invention The invention consists in overcoming the drawbacks of the prior art.

B) Structure of the Invention An outer box with an opening at the top in which an inlet and an exhaust port located above the inlet are formed on one side wall, and an inner box with an opening at the top arranged inside this outer box. A space arranged on the box side and connected by an annular connecting member having an exhaust port formed on one side adjacent to and facing the exhaust port of the outer box, and consisting of bottom, front, rear, left, and right areas. After assembling the box, the box is fixed with the opening surface as the top surface using both the inner and outer jigs, and the foaming agent, which is the stock solution of the foam insulation material, is poured into the bottom area of the space far from the injection port. A method for producing a heat insulating box body in which a foamed heat insulating material is formed by injecting air into the back of the space and exhausting the air in the space from both the exhaust ports of the outer box and the connecting material, which are the final foaming points.

(E) Embodiments of the invention As shown in FIGS. 1 to 3 (11 is a box body, this box body consists of a metal inner box (2) with an open top surface and a metal outer box (2) with an open top surface. It is assembled by a box (3) and a resin annular connecting member (4) that interconnects both the inner and outer boxes.

The inner box consists of a bottom wall (2 people) and four side walls (2B) to (2E) on the front, left, and right sides rising from the periphery of the bottom wall,
At the upper end of the can wall, flanges (2F) to (2) are formed which contact along one end edge of the connecting member (4). Also, like the inner box, the outer box includes a bottom wall (3A) and four side walls (3B) to (3B) rising from the periphery of the bottom wall.
E), and the upper end of each side wall includes front, rear, left, and right opening end surfaces (3F) to (3I) extending perpendicularly inward, and opening end surfaces (3F) to (3I) extending perpendicularly downward from the inner edge of each opening end surface. Flanges (3J) to (3M) are formed in contact with the other end edge of the connecting member. In addition, the connecting member is attached to each of the front, rear, left and right sides (4
A) to (4D), and each side of and has both flanges (2
F) ~ (2I), (3J) ~ (3M)K mediated,
A protrusion (6) defining a groove (5) for storing lead wires, etc., and flanges (2F) to (2F) of the inner box (2) or outer box (3) extending vertically from both ends of this protrusion. 2I), (3J)~
(3M) and regulating parts (7A) and (7B) that regulate the degree of insertion of the protrusion, and both flanges (2F) to (2I) extending upward or downward from one end of the regulating parts. 3J
) to (3M) are integrally formed with the locking portions (8AX8B) spaced apart from each other.

(9) is a space formed by fixing the connecting member (4) to both the inner and outer boxes (2) + 31 using fasteners (10A) (10B) such as screws, and is a space formed on both bottom walls of both boxes. (2A) (
3A) and the bottom area (9A) between each side wall (2B) to (2
E), each area (9
It consists of B) to (9E). 01) aυ is an inlet formed at the center of both ends of the front wall (3B) of the outer box (3), and it is injected into both the left and right areas (9C) (
9E). The aaoa is formed on the front wall (3B) of the outer box (3) in the same way as the injection port, and is a large number of exhaust ports arranged in a row. It is located along the line and faces the front area (9B) of the space (9). The number of these exhaust holes is the front side wall (3B
) It is dense near the center of the upper edge and coarse near both ends. (131 (1:1) is a large number of exhaust ports formed in a row on the protrusion (6) of the front side (4A) of the connecting member (4), and is a space ( 9), and like exhaust port a 02, its number is dense near the center and sparse near both ends.The opening area of this exhaust port is the same as that of 02 of exhaust port a. Exhaust port 07Ja21
is smaller than that of (14) (14) is a thin plate made of closed-cell soft resin such as foamed polyethylene that is pasted on the regulating part (7AX7B) of each left and right side (4B) (40X4D) after the connecting member (4). With the heat insulation sealing material,
After both the inner and outer boxes (2) [3], the left and right flanges (2G
After X2H) (2I), (3K) (3L) (3M) and connecting material (4), left and right sides (4B) (4C) (4D
). (] 5) (l [i is the front wall (
3B) is provided on the space (9) side surface, and an inlet (I I) αυ and an exhaust port α21 are provided as the blowing agent grows, which will be described later.
It is a self-closing cap made of paper or the like that closes a'a. (17
) is the exhaust port 03 (1
This is an air-permeable sealing material made of open-cell soft resin such as maltbrene, which is provided on the surface of the protrusion (6) on the space (9) side so as to cover the protrusion (6). After foaming the box body (1), the engaging pieces (18A) (18B) formed on both edges of the cover made of dark resin are shown by the dashed line in Figures 4 and 5 and the solid line in Figure 6. , the locking part (8A) of the connecting member (4) (
8B) to cover the connecting material (4).

As shown in FIGS. 7 to 9, the box body is fixed by an inner and outer jig (20) 01) heated to an appropriate temperature in advance,
Foaming work is applied. The inner jig is inserted into the inner box (2), and has a core (20A) forming an exhaust path (22 (22)) communicating with the exhaust port (1, 3 + (13)) of the connecting member (4);
An annular portion (20B) that holds open end faces (3F) to (3I) of the outer box (3) is formed of a ring, and is suspended from a support device (not shown) via an arm (20C') so as to be able to rise and fall. The outer jig is made up of four front, rear, left, right, and left side plates (21B) that can be moved into and out of contact with the substrate (21A) on which the box (1) is placed.
21E), and the front side plate (21B) facing the front wall (3B) of the outer box (3) has an injection port α.
1) (An injection path ◇!31 (23) communicating with lυ and an exhaust path (24) C24 communicating with the exhaust port (+2) 02) are formed. (Two (25) are injection guns.

First, the box (1) is placed with the outer jig (21) with the opening surface as the top surface.
The inner box (2) is held down by the inner jig (20) that descends next, and the outer jig C? 1) Each side plate (21B) to (21E
), each side wall (3B) to (3E) of the outer box (3) is pressed and fixed.

After fixing the box (1), as shown in Figures 7 and 8, pass the injection gun (2 (c) As shown in FIG. 8, a blowing agent W such as
9D) (9E) and inject at two points deep into the bottom area (9A), that is, at both ends of the bottom area (9A) on the rear area (9C) side. In the early stage of foaming, the injected foaming agent W grows radially and joins both sides, filling the rear area (9C) first, and then filling the bottom area (9A) in the middle stage of foaming, as shown in FIG.
, grows from the left and right areas (9D) (9E) towards the anterior area (9B), and in the late stage of foaming, it merges from the three directions and grows upward from the bottom of the anterior area (9B), resulting in autistic closure. Close caps a00 in sequence. During this time, the foaming agent W passes through the cream time when it changes from liquid to foam, the gel time when the growth rate slows down due to the foam, the tax free time when the adhesive force weakens due to the foam, and the foam time when the growth stops and solidifies, as shown in Figure 10 (b). Foam insulation material shown in Figure 11-
becomes. On the other hand, as the foaming agent W grows, the air (including fluorocarbon gas) in the space (9) is moved to the injection port aυαυ and both exhaust ports α due to the foaming pressure, as shown by the arrows in FIGS. 9 and 10 (a). α2, a Crane is gradually pushed out.

After forming the foamed heat insulating material W, the desired heat insulating box (1) can be obtained by removing the inner and outer jig (2(j) (2υ).

According to the curl manufacturing method, the blowing agent W is injected into the injection port (Iυ01
) is injected deep into the bottom area (9A) of the space (9) far from the inlet QH]) and both exhaust ports (12) (12), (
1, 31 (131 is m tr In order to make the front area (9B) the final foaming area, the foaming agent W in a tax-free state is filled into the front area (9B), and the injection port 0υ (1υ, Both exhaust ports (12) Q21. (+3) (1
3) There is little foam leakage from the foam (even if it leaks, it can be easily removed because the adhesive strength of the foam insulation material is weak,
Also, both exhaust ports a', which are the final foaming points in the final foaming area!
In addition, since the air in the space (9) is divided into inward and outward directions and discharged to the outside, not only does the foaming agent (5) not stand up unevenly in the final foaming area, but also It is also possible to prevent the generation of large eddy currents of air at the corners of the final foaming area, resulting in smooth air removal and improved growth of the foaming agent W, resulting in foamed insulation (
5) It is possible to prevent the formation of so-called cavities, which is the foaming failure. or,
By making the opening area of the exhaust ports (13) (131) of the connecting member (4) smaller than the exhaust port α of the outer box (3), the amount of leaking foam insulation material on the inner box (2) side can be reduced. By making it smaller than that on the outer box (3) side, it is possible to save time and effort in removing the leaking foam insulation material.

(f) In order to make the final foaming area the front area of the space facing the injection port, exhaust port of the outer box, and the exhaust port of the connecting material, the foaming agent in a tax-free state whose adhesive force has been weakened by the foam is applied to the front area. As a result, foam leakage from the inlet and both exhaust ports is reduced, and even if leakage occurs, the adhesive strength of the leaking foam insulation material is weak, so the leakage foam insulation material will not leak after the foaming process is completed. In order to make removal work easier, and to separate the air in the space into inward and outward directions and discharge it from both exhaust ports, which serve as the final foaming points, the rising edge of the foaming agent is offset and the air inside the space is removed. As a result, the air can be removed smoothly, the growth of the foaming agent is improved, and the formation of nests in the foam insulation material near the final point of foaming is prevented. can.

[Brief explanation of the drawing]

The drawings show an embodiment of the method for manufacturing a heat insulating box according to the present invention, and the first embodiment
The figure is a perspective view of the box, Figure 2 is an enlarged view of Figure 1A- is an enlarged view of Figure 3C, Figure 5 is an enlarged view of Figure 3, and Figure 6 is a vertical perspective view showing the connection with a connecting member. Figure 7 is a perspective view of the box body fixed with the inner and outer jigs, Figure 8 is a sectional view taken along line EE in Figure 7, Figure 9 is a sectional view taken along line FF' in Figure 7, and Figure 10 ( A) (B) is a vertical cross-sectional view of the main part showing the growth of the foaming agent at the final foaming point.
Figure 1 is a longitudinal sectional view of the heat insulating box. (1)...Box body, (2)...Inner box, (3)...
・Outer box, (4)...connecting material, (9)...space,
aυαυ・・・Inlet, (13(13(131Q3
)...exhaust port, W...foaming agent. Wife Figure 10 (A) (B) 7

Claims (1)

[Claims] 1. An outer box with an opening at the top in which an inlet and an exhaust port located above the inlet are formed on one side wall, and an inner box with an opening at the top disposed within the outer box. are arranged on the inner box side and connected by an annular connecting member with an exhaust port formed on one side facing the exhaust port of the outer box in the vicinity of and opposite to the bottom, front, rear, left, and right regions. After assembling a box body with a space made up of A method for producing a heat insulating box body, which is formed by injecting air into the depths of the bottom area of the box and discharging the air in the space from both the exhaust ports of the outer box and the connecting member to form a foam heat insulating material. 2. The method of manufacturing a heat insulating box according to claim 1, wherein the opening area of the exhaust port of the connecting member is smaller than that of the exhaust port of the outer box.