JPH0760061B2 - Insulation box manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] The present invention relates to a heat insulation box body configured by filling a foam insulation material in a space formed between an inner box and an outer box.

2. Description of the Related Art Japanese Utility Model Publication No. 62-1976 discloses a technique relating to a showcase connecting device in which an upper case having a front opening is placed on a lower case having an upper opening, and both cases are connected together. In Japanese Examined Patent Publication No. 61-6312, an upper case formed by a heat insulating wall having a front opening, a lower case formed by a heat insulating wall having an upper opening and mounting the upper case are provided on both left and right side surfaces of both cases. Disclosed is a refrigerating showcase including a side wall and a main body.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the showcase disclosed in Japanese Utility Model Publication No. 62-1976 in the prior art, the connection between the upper case and the lower case is exposed on both left and right sides, so that the appearance is poor. There is a problem. Further, according to the showcase in Japanese Patent Publication No. 61-6312, the connecting portion is hidden by the side wall, but the side wall must be attached separately, which causes a problem that the showcase becomes large. Furthermore, both cases have to perform the foaming work independently of both cases, and then the connecting work of both cases must be performed, and the process of assembling-foaming-connecting is required in the production, which causes a problem of poor work efficiency. there were.

Therefore, the present invention provides a method of manufacturing an insulating box body in which upper and lower cases are integrally foamed.

[Structure of Invention]

Means for Solving the Problems The present invention provides an inner box and an outer box in a heat-insulating box body having a lower storage chamber having an upper surface as an outlet for articles and an upper storage chamber having a front surface as an outlet for articles. A box body is formed by combining them, and a plurality of injection ports are provided on the top wall or bottom wall of the box body, the box body is fixed to a foaming jig, and it corresponds to the storage chamber on the side far from the injection port. Provided is a method for manufacturing a heat-insulating box in which a predetermined amount of stock solution is injected between the inner and outer boxes through an injection port, and a predetermined amount of stock solution is injected again after a predetermined time has elapsed.

A predetermined amount of the undiluted foaming solution injected toward the space corresponding to the storage chamber on the side far from the injection port grows in this space,
I try to proceed toward the space near the inlet,
A certain amount of undiluted solution injected after a lapse of a predetermined period of time weakens its progress, on the contrary, a certain amount of undiluted solution is prevented from growing in the space on the far side, and a certain amount of undiluted solution is directed into the space on the near side. It promotes growth and acts to promote the advance of the previously injected stock solution to unfilled sites in the far side space.

In addition, since the side wall of the heat insulating wall formed by this method is continuously formed, the weight of the heat insulating box is distributed and received over the entire side wall, avoiding concentrated load on a part of the wall. There is.

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

Reference numeral 1 denotes an upper case 4 composed of a heat insulating wall 3 having an opening 2 for storing and taking out products on the front surface, and a lower part composed of a heat insulating wall 6 having an opening 5 for storing and taking out products on the upper surface. This is a heat-insulating box body typified by a dual-type showcase in which the main body is constituted by the case 7.

The upper case 4 is a transparent door 11 that opens and closes the opening 2 freely.
And the heat insulating wall 3 and the transparent door 11 form the upper storage chamber 12.

The heat insulating wall 3 is made of a metal, for example, a hot-dip galvanized steel inner box 15 having an opening on the front surface, and a metal having an inner space accommodated at an appropriate interval between the inner box 15 and the front surface being opened, for example, hot-dip galvanizing. A foam insulation material 18 such as hard polyurethane is foam-filled in a space P corresponding to an upper storage chamber constituted by an outer box 16 made of a steel plate and a resin breaker 17 for thermally insulating the two boxes. It

The lower case 7 is provided with a transparent door 21 as a sliding door that is slidably mounted in the opening 5 in the front-rear direction.
21 and 21 form a lower storage chamber 22.

The heat insulation wall 6 is made of a metal, for example, a hot-dip galvanized steel inner box 25 having an open upper surface, and a metal such as a hot-dip-galvanized metal housing having an inner box accommodated at an appropriate interval between the inner box 25. In the space Q corresponding to the lower storage chamber, which is composed of an outer box 26 of steel plate and a resin breaker 27 that is disposed over the upper ends of the boxes 25, 26 corresponding to the openings 5, hard polyurethane or the like is provided. It is configured by foaming and filling a foam insulation material. A projecting wall 6A extending in the direction of the opening 5 is formed behind the upper surface opening 5 to form a hexahedron of front, rear, left and right projecting walls.

The outer boxes 16 and 26 are formed of a single plate so as to be common to the left and right side plates 31, respectively, and the upper and left side walls of the heat insulating wall 6 are covered with the left and right side walls extending from the upper end of the inner box 25 to the inner surface of the outer box 26. Left and right resin breakers 32 made of resin extending from the front end to near the back wall are provided. The right and left breakers 32 have a passage 32 such as a through hole or a cutout for passing a heat insulating material formed in a portion corresponding to the side wall of the rear upper storage chamber. In addition, a metal reinforcing breaker 33 having a U-shaped cross section is arranged on the upper surface of the left and right breakers 32, and a connecting path 33A such as a hole or a notch is provided in the reinforcing breaker 33 in correspondence with the passage 32A of the left and right breakers. Has been formed. Further, a leak prevention plate 35 is provided so that the heat insulating material passing through the passage 32A and the communication passage 33A does not leak to the front portion of the breaker 32 and the door storage portion 10.

Next, a method for manufacturing the heat insulating box 1 will be described.

41 is an inlet for the foaming stock solution which is formed on the outer box top plate 16A and is located at the left and right side wall corresponding portions in the space between the inner and outer boxes,
42 is an upper exhaust hole formed in the outer casing top plate, 43 is a breaker exhaust hole formed in the breaker 27 of the lower case, and 44 is a lower exhaust hole formed in the outer casing bottom plate 26B. However, the inlet 41 may be formed in the outer box bottom plate 26B.

In addition, 45 is the top plate 16A of the outer box so as to cover the respective inlets.
A plate-like self-closing cap made of paper or a soft resin attached to the inner surface, which is pushed open by insertion from the injection port 41 of the injection gun 60 described later, and returns by its own elasticity after injection of the foaming stock solution, and then The filling port 41 is closed by being pushed in the outer box direction by the foaming pressure of the foam insulation material.

The box body 1A formed by both the inner and outer boxes and the breaker is fixed by the upper and lower jigs 70 and 76 and the nests 77 to 80 which have been heated to an appropriate temperature in advance, and subjected to the foaming work. The lower jig 76 is formed with a step 76A corresponding to it because the back plate of the outer box 16 projects rearward from the back plate of the outer box 26. 77 is a bottom insert placed at the bottom of the upper case 4, 7
Reference numeral 9,80 is an inner insert inserted in the inner box of the lower case. The upper jig 70 includes an upper insertion portion 71 that is inserted into the inner box 15 of the upper case 4, a lower insertion portion 72 that is inserted into the door storage portion 10 formed between the upper and lower cases, and the left and right sides of the box body. Left and right side portions (not shown) that come into contact with the side plates from the outside, an injection path that comes into contact with the top plate 16A of the box body 1A and communicates with each of the injection ports 41, and the 73A upper exhaust hole 4
The top part 73 forming the first exhaust path 73B communicating with the 2 and the box body 1A
And a bottom portion 74 which is in contact with the bottom plate 26B and communicates with the lower exhaust hole 44 and which forms a second exhaust passage 74B, and is suspended vertically.

First, the box 1A is laid sideways so that the opening 2 is on the upper surface and placed on the lower jig 76, and then the respective nests 77 to 80 are inserted,
The inner jigs 15, 25 and the outer breakers 17, 26 and the breakers 17, 27 are pressed and fixed by the descending upper jig 70. After this fixing, the injection gun 60 is inserted to the injection port 41 and the self-closing cap is pushed open to fill the entire space Q corresponding to the lower storage chamber with the foamed stock solution W1 of hard polyurethane toward the space corresponding to the left and right side walls. A sufficient amount (this is referred to as a predetermined amount) (this may be conducted by using a heat insulating pipe 50). Then, after the injected undiluted solution foams and grows in the space Q and a predetermined time (for example, about 10 seconds) set to be approximately equal to the time required to fill the left and right sidewalls of the lower storage chamber has elapsed, the injection port 41 is again opened. From the above, a proper amount (which is called a constant amount) of the foaming stock solution W2 is injected to fill the space P corresponding to the upper storage chamber 12. The injected undiluted foaming solutions W1 and W2 perform radial foaming growth starting from the first reaching point. As this growth, the cream time that changes from liquid to foam, the gel time that slows down the growth rate in the foam state, the tack free time when the adhesive strength weakens, the form time when the growth stops and solidifies, the space P, It becomes the foam insulation 18,28 that is embedded in Q. The gas in the space Q is the lower exhaust hole 44 and the second exhaust passage 74B.
It is discharged to the outside via the breaker exhaust hole 43. On the other hand, the gas in the space P is discharged from the upper exhaust hole 42 and the first exhaust passage 73B.

As described above, the primary injection for injecting the undiluted solution from the injection port into the space Q corresponding to the storage chamber on the side far from the injection port (the space Q is filled up) with a predetermined amount, and the primary injection After a lapse of time (predetermined time) that the progress of the growth of the stock solution thus obtained reaches the space P corresponding to the storage chamber near the injection port, a fixed amount (sufficient to fill this space P) is injected. Since the secondary injection is separately performed, a predetermined amount of the undiluted solution W1 is filled in the space Q, and a fixed amount of the undiluted solution W2 is filled in the space P, which are independent of each other. You can
It is possible to solve the problem that it is difficult to spread the heat insulating material in each space as compared with the case of the normal single injection. This is particularly effective when the structure of the box 1A is complicated. Further, the heat insulating material can be efficiently filled in the box body having a space that is located away from the inlet and has a large filling volume and is structurally complicated as in this example. Then, the heat-insulating material 28 of the primary injection that has grown in the connecting portion of both spaces is the second
The growth of the undiluted solution due to the subsequent injection reduces the growth, promotes the growth progress to the unfilled portion in the space Q, and makes it possible to improve the filling of the heat insulating material in each space.

On the other hand, because the location of the product outlet is different, it is possible to perform integral foaming for the type of insulating box that was not integrally foamed. It is possible to eliminate the work of connecting and the work of concealing the connected parts, so that the appearance of the finished heat insulating box is not impaired, and the work of manufacturing the heat insulating box becomes easy. Further, since it is configured by integral foaming, it is easy to make the heat insulating performance of the heat insulating wall uniform and to improve the structural strength thereof as compared with the connection type structure.

〔The invention's effect〕

As described above in detail, a predetermined amount of the undiluted foaming liquid is injected as the primary injection into the space corresponding to the storage chamber on the side far from the plurality of inlets formed on the top wall or the bottom wall of the box. Then, within the predetermined time, foaming grows in the space sequentially, and progresses toward the space corresponding to the storage chamber on the side close to the injection port, and the predetermined time set to the time required for the progress up to this point elapses. After that, since a fixed amount of the foaming undiluted solution is injected as the second injection, the growth toward the other spaces is weakened, and the growth to the unfilled portion in each space can be promoted. Further, in the secondary injection, the foaming undiluted solution is foamed and grown only in the space on the near side, so that the foam growth can be made substantially independent in each space, and the heat insulating material which is likely to occur in the space near the injection port is rotated. It is possible to solve the problem of difficulty.

On the other hand, the heat insulation box body formed by this method can have its side wall made of an integral foam heat insulation material. For this reason,
Since the weight of the heat insulation box is supported by the side wall that is integrally foamed, the structural strength of the heat insulation box can be improved, and the heat insulation walls in which the storage chambers are independently configured are stacked vertically. It is also possible to dispense with the work involved, and to dispense with a special covering member, which in this case makes the connecting part invisible from the outside.

[Brief description of drawings]

Each drawing shows an embodiment of the present invention, and FIGS. 1 and 2 are explanatory views of the first and second injections of the foaming stock solution into the box, and FIG. 3 shows the heat insulating box. Fig. 4 is a sectional view of the right side wall, Fig. 4 is a sectional view of the box body fixed to a foaming jig, Fig. 5 is a sectional view of the vicinity of the inlet, and Fig. 6 is a horizontal sectional view of the communicating portion of the side wall. FIG. 7 is a vertical cross-sectional view of the heat insulation box, and FIG. 8 is a partial cross-sectional perspective view of the heat insulation box seen from the rear. 1 ... Insulation box, 1A ... Box, 12 ... Upper storage room, 15,2
5 …… Inner box, 16,26 …… Outer box, 22 …… Lower storage room, P, Q…
… Space, 18, 28… Insulation, W1, W2… Foaming stock solution.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Naganuma 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd. (56) References: 59-195476 (JP, U) -4863 (JP, Y2)

Claims (1)

[Claims] 1. A heat-insulating box body having a lower storage chamber whose upper surface has an outlet for articles and an upper storage chamber whose front surface has an outlet for articles, wherein an inner box and an outer box are combined to form a box body. A plurality of injection ports are provided on the top wall or the bottom wall of the box body, the box body is fixed to a foaming jig, and the space between the inner and outer boxes corresponding to the storage chamber on the side far from the injection port is formed. A method for manufacturing a heat-insulating box, comprising injecting a predetermined amount of the undiluted solution through an inlet and again injecting a predetermined amount of the undiluted solution after a lapse of a predetermined time.