JPS58214770A - 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 The present invention uses a 5-y (stationary fixture) foaming method to inject a foaming agent into the space at two points through opposing areas on one side of the space of the box, thereby creating a foamed insulation material. The purpose of this method is to increase the growth rate of the foaming agent in the other opposing area of the space intersecting the blowing agent injection direction to the same rate as the one opposing area. The purpose is to maintain the same speed and eliminate foaming defects.

Generally, the SF foaming method is a method used to manufacture heat 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 bottom wall of the outer box is placed on an outer jig board with the opening facing upward. 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 proceed to the next step with the opening as the top surface. 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 the 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 the foaming agent is injected into one side of the space opposite each other. A foaming agent is injected at two points (two places) into both ends of the bottom area on the bottom wall of the outer box through both the left and right areas, and air in the space and fluorocarbon gas, which is a growth agent for the foaming agent, are injected from the exhaust hole formed in the connecting member. During the initial stage of foaming, the foaming agent grows from both ends of the bottom area in the lateral direction, that is, toward the center of the bottom area, and upwards, that is, toward the top of both the left and right areas. They merge at the center of the bottom zone and grow toward the top of the other opposing zone that intersects with the blowing agent injection direction during the middle stage of foaming, that is, both the front and rear zones, so that the blowing agent in both the front and rear zones is smaller than the left and right zones. Growth was slowing down, and the foam insulation material at the top of both the front and rear areas of the space was in a so-called nest state, causing poor foaming.

The present invention is a manufacturing method designed to avoid such foaming defects, and embodiments thereof will be described below with reference to the drawings.

(1) shown in Figures 1 to 3 is a box body, which consists of a metal inner box (2) with an opening on the top, an outer metal box (3) with an opening on the top, and both inside and outside of this box. It is assembled with a resin annular connecting member (4) that interconnects the boxes. The inner box consists of a bottom wall (2 people) and four side walls (2B) to (2E) on the front, back, left and right sides rising from the peripheral edge of the bottom wall, and the - side of the connecting member (4) is attached to the upper end of each side wall. Flange (2B) in contact with
~(2E) is formed. Also, the outer box, like the inner box, consists of a bottom wall (3A) and four front, rear, left and right side walls (3B)-('3)lu) rising from the peripheral edge of the bottom wall,
Flanges (3B) to (3Fi) that contact the other side of the connecting member (4) are formed at the upper end of each side wall. Further, the connecting member has one opposing narrow long side portion (4A) (
4B) and the other opposing wide short side (40)
(4D), whose longitudinal shape is U-shaped; -1
An opening (5) of the box (1) is defined by the inner peripheral surface thereof. (
6) is a space formed by assembling both the inner and outer boxes (2) and (3) using the connecting member (4);
A) Bottom area (6A) between (3A) and both side walls (2
B) - (2E), (3B) - (3E) Consists of front, back, left and right sections (6B) - (6E), located directly below the long sides (4A) (4B) of the connecting member (4) The thickness of both the front and rear areas (6B) (60) is the short side (40) (
Both the left and right areas (6D) (6E
) is thinner than the thickness of (7A) (7B) are injection ports formed at the center of both ends of the front wall (3B) of the outer box (3), and are in both left and right areas of the space (6) (6D) (6K)
I'm going to meet you. (8A) and (8B) are exhaust holes formed in large numbers on both long sides (4A) and (4B) of the connecting member (4), which face both the front and rear areas (6B) and (60) of the space (6). The exhaust holes are formed so that the number of the exhaust holes decreases progressively from the center to both ends of the long sides (4A) (4B). (sc) (8D) Id Non-pores formed on the inner wall of the short side (4C) (4D) of the connecting member.

As shown in FIGS. 4 to 7, the box body is fixed with both the inner and outer jigs (9) QO) which have been heated to an appropriate temperature in advance, and a foaming operation is performed. The inner jig is inserted into the inner box (2) and has an exhaust passage (sc) communicating with the exhaust hole (s:o).
ltc) (itl)) and an exhaust hole (8A) facing the connecting member (4).
It consists of an annular part (9B) in which an exhaust passage (IIA) (LIE) is formed, which communicates with the air outlet (8B), and is vertically suspended from a support device (not shown) via an arm (9C). In addition, the external jig includes a substrate (IOA) on which the box (1) is placed, and four side plates (IOB) on the front, rear, left, and right sides that can be freely approached and separated from each other.
(log), and in the center of both ends of the front side plate (IOB) facing the front wall (3B) of the outer box (3), there are injection channels (log) communicating with the injection ports (7A) (7B). 12A
) (12B) is formed.

First, the box body (1) is opened with the opening (5) as the top surface and the outer box (3
) was installed on the substrate (IOA) of outer jig 0 [, and then lowered by the inner jig (9), the inner box (2
) and connecting member (4) are held down, and each side wall (3B) to (3E) of the outer box (3) is pressed from each side plate (10B) to (1oE) of the outer jig QO) that has risen. It is held down and fixed. After fixing the box body (1), insert the injection guns (13A) (13B) shown in FIGS. 4 and 5 into the injection path (12A) (
12B) and the injection holes (7A) (7B), and the foaming agent (W) such as hard polyurethane stock solution is passed through both the left and right areas (6D) (6E) of the space (6) as shown in FIG.
6A) Inject two points at both ends.

At the initial stage of foaming, the injected foaming agent (V/) is directed from both ends of the bottom area (6A) toward the center, as shown in FIG.
Then, the acid lengthens toward the top of both the left and right sections (6D) (6K) and merges at the center of the bottom section (6A), and then, as shown in Figures 7 and 8, in the middle of foaming, both the front and rear sections (6B) ) (Grows towards the top of 6C, and in the late stage of foaming both the front and rear areas (6B)
(The growth of 6C has almost caught up with the growth of both the left and right areas (6D) and (6B), and during this time the foaming agent is used in cream time, which changes from liquid to foam, gel time, which slows down the growth rate due to foam, and tack-free, which weakens adhesive strength. After a foam time during which the growth stops and solidifies, the foamed insulation material (W) becomes a foamed insulation material (W).Meanwhile, as the foaming agent (W) grows, the air and fluorocarbon gas in the space (6) are removed by the foaming pressure. As shown by the arrows in Figure 7, exhaust holes (8A) (8B) (80) (8D) and exhaust passage (II
A) (IIB) (110) Gradually pushed out from (IID). After forming the foam insulation material (Tsukasa), insert the inner and outer cylinder jig (
By removing 91 (to), the insulation box (1,) is completed.

According to this manufacturing method, the air in the space (6) is filled with a blowing agent (
In order to discharge more from the upper center and less from both ends of the front and rear areas (6B) (6C) which intersect with the injection direction of W), the foaming agent (W) is injected at two points so that the most time-delayed area at the beginning of foaming is discharged. The foaming agent (
The growth of W) is promoted by evacuation of air, especially the blowing agent (
Recover the time delay in the growth of the foaming agent (W) by increasing the amount of air discharged in the center of both the front and rear zones (6B) (60) where the season joins, and the growth of both left and right zones (6D) (6E) As a result, it is possible to prevent foaming failure of the foamed heat insulating material (W) in both the front and rear regions (6B) (6C).

It should be noted that when the heat insulating box (1) f'i completed according to the present invention is used as a refrigerator, the opening (5) will be the front side.

As described above, it is possible to promote the growth of the foaming agent in both areas intersecting the injection direction of the foaming agent in the space of the box, and to prevent foaming defects.

[Brief explanation of drawings]

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 assembled box, and Figure 2 is Figure 1 A-A.
The sectional view, Figure 3 is the BB sectional view of Figure 1, and Figures 4 to 7.
The figures show the foaming process, Fig. 4 is a perspective view of the box fixed with an inner and outer cylinder jig, Fig. 5 is a drawing, Fig. 7 is a sectional view taken along Fig. 5 E-E, and Fig. 8 is Fig. 5 F. -F sectional view and FIG. 9 are the insulating boxes manufactured according to the present invention, and are longitudinal sectional views corresponding to FIG. 2. , (2)
...Inner box, (3)...Outer box, (5)...Opening, (6)...Space, (6A) (6] 3) (60
) (6D) (6E)...Bottom, front, back, left, right areas, (7A) (7B)...Inlet, (8A)
(8B)...Exhaust hole, (9)...Inner jig, α0)
...outer jig, (W)...foaming agent, (W)...
Foam insulation material 5th flash Figure 6

Claims (1)

[Claims] 1.Both the inner and outer boxes are connected to each other, and between the two boxes, there is a bottom area where the foaming agent is injected at both ends, both left and right areas that guide the foaming agent injected into this bottom area, and a foaming agent. Assemble a box with a space formed by both the front and back areas that intersect with the injection direction, fix the box with an inner and outer jig with the opening of the box as the top surface, and inject a foaming agent into the space to foam and solidify. A method for producing a heat insulating box body, which is characterized in that a foamed heat insulating material is formed by discharging more air from the space from the upper center of both the front and rear areas and less air from both ends.