JPH08159651A - Heat insulation box body and manufacture thereof - Google Patents

Abstract

PURPOSE: To prevent leakage of foamed resin when a heat insulation material between two boxes is formed of foamed resin, in a heat insulation box body having inner and outer boxes. CONSTITUTION: A heat insulation material-filling space 31 is formed between inner and outer boxes 3 and 5 being the skeleton of a heat insulation box body. In manufacture, the heat insulation material-filling space is set in a bottom mold 17 of a foaming jig with upside down. The bottom (shown upside down) of the heat insulation material-filling space 31 is not surrounded with the outer box 5. In manufacture, the bottom is a plastic corrugated board 33 being a part of a heat insulation box body and the peripheral edge part thereof is pressed by a inner peripheral shelf 5a. Foamed resin is injected in the heat insulation material-filling space 31 to form a heat insulation material wall and a heat insulation material floor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating box used for a refrigerator, an ice storage box for an ice making machine or the like, and more particularly to a structure and a manufacturing method thereof.

[0002]

2. Description of the Related Art In a refrigerator, an ice storage box or the like, a heat insulating box body mainly composed of an inner box, an outer box surrounding the box, and a heat insulating material between both boxes is used. It has been proposed that the inner box and the outer box are integrally molded in consideration of manufacturability and aesthetic appearance, and the heat insulating material is formed from foamed resin (Patent Kokoku 3).
-62988). This will be briefly described with reference to the drawings. In FIGS. 11 and 12, the ice storage unit 1 of the ice making machine to which an ice making unit (not shown) is attached is
It has a box shape with an open top and a closed bottom. The inner box 3 and the outer box 5 are manufactured by integral molding of resin, and are connected by a planarly discontinuous connecting portion 7. The heat insulating material wall 9a and the heat insulating material floor 9 are provided along the outer surface of the inner box 3.
Each b is formed and is made of foamed resin as described later. A groove 11 is provided at the upper end of the outer box 5 to fit a cabinet (not shown). A mounting portion 13 is fixed to the upper end of the inner box 3 with a rivet and is used for mounting an ice making unit (not shown). The inlet of the drain pipe 15 stands inside the inner box 3.

In order to produce the ice storage unit 1 having the heat insulating structure as described above, the heat insulating material layers (the heat insulating material wall 9a and the heat insulating material floor 9b) are formed according to the following procedure. That is, 1. The inner box 3 and the outer box 5 (molded body) integrally molded in advance are set in the lower mold 17 of the foaming jig with the top and bottom reversed as shown in FIG. At that time, the foam leakage prevention tapes 19 and 2
1 is attached to the entire circumference along the upper edge end surface of the outer box 5 and the inner peripheral surface of the lower edge. 2. Liquid foamed resin is injected into the spaces (9a, 9b) forming the heat insulating material layer. 3. Before the foaming starts, the upper mold 23 of the foaming jig is quickly closed, and the lower mold 17 and the upper mold 23 are clamped to withstand the foaming pressure. 4. If this state is maintained for a predetermined time, foaming is performed in the foaming jig, and the heat insulating material wall 9a and the heat insulating material floor 9b are obtained.

[0004]

In the above-mentioned manufacturing procedure, a tape is attached to prevent foam leakage.
Leakage cannot be completely prevented. Once foam leakage occurs,
The leaked foamed resin adheres to the outer surface of the outer box 5 of the ice storage unit 1 (see FIG. 1).
It is indicated by reference numeral Z in FIG. However, since the foaming liquid contains a component that dissolves the main body resin, the stain portion cannot be separated and corrected. For this reason, they had to be discarded, resulting in a high defect rate and a high manufacturing cost as a whole. Furthermore, if foam leakage occurs, the foam jig will become dirty, so frequent disassembly and cleaning will be required, improving mass productivity,
It was a cause of hindering the improvement of equipment utilization rate. As a countermeasure against this, use of a normal resin plate or a thin zinc-iron plate that entirely covers the space of the heat insulating material floor 9b has been considered in place of the leak preventive tape 21, but in any case, foam leakage can be completely prevented. At the joint between the plate and the molded body, a leak-proof tape similar to the conventional one was required. Therefore, it is an object of the present invention to provide a structure and a manufacturing method thereof that can easily prevent foam leakage when manufacturing a heat insulating box having a heat insulating material layer made of foamed resin.

[0005]

To achieve the above object, according to the present invention, an inner box that defines a storage space inside and one side of which is open, and surrounds the inner box from the side. A heat-insulating box body having an outer box and a heat-insulating material filling space defined by the outer box and the inner box and having one surface facing the outside, wherein the surface of the heat-insulating material filling space facing the outside is a compression elastic laminated plastic. It is characterized in that a foamed resin is injected and filled into the closed space of the heat insulating material, which is closed by a plate.
The compression-elastic laminated plastic plate is made of a plastic consisting of at least two plastic flat plates arranged in parallel at a distance and a plurality of plastic thin plates formed at a distance between the plastic flat plates. Corrugated cardboard So-called plastic cardboard is preferably used. Further, according to another aspect of the present invention, an inner box which defines a storage space inside and one side of which is open, an outer box which surrounds the inner box from a side, and an outer box which is defined by the outer box and the inner box. When manufacturing a heat-insulating box having a heat-insulating material filling space formed on one surface and exposed to the outside, the inner box and the outer box are set in a void in a foaming jig, and a surface is provided outside the heat-insulating material filling space. It is characterized in that a compression elastic laminated plastic plate body is sandwiched between the above surface and the foaming jig and the injected liquid resin is foamed in the same heat insulating material filling space. The compressive elastic laminated plastic plate preferably exhibits sufficient elasticity against a load in the plate thickness direction, and the above-mentioned plastic corrugated board is preferably used.

[0006]

According to the present invention described above, the molded bodies of the inner box and the outer box are set in the lower mold of the foaming jig so that the surface facing the outside of the heat insulating material filling space is located above. A compression elastic laminated plastic plate body is sandwiched between the surface facing the outside and the upper mold of the foaming jig so as to close the heat insulating material filling space defined by the box and the outer box. The liquid foamed resin may be injected before or after the sandwiching, but in the latter case, an appropriate injection hole is provided. Since the plastic plates sandwiched in this way are pressed and compressed by the upper mold of the foaming jig,
The gap between the unbonded surfaces that deforms well and causes foam leakage is completely eliminated. When plastic corrugated cardboard is used as the compression elastic laminated plastic plate, even if there is a gap in the joint surface between the outer box and the plastic corrugated board and foaming leakage occurs, the leaked foamed resin will enter the intermediate space of the plastic corrugated board and outside. Does not leak to.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the attached drawings, the same parts, including those related to the above-mentioned conventional technique, are designated by the same reference numerals. First, FIG. 1 shows a state of manufacturing the ice storage unit of the ice making machine as described above. In FIG. 1, the outer box 3 and the outer box 5 are integrated by a connecting portion 7, and a molded body 10 is formed.
Is composed. The molded body 10 is set in the lower mold 17 of the foaming jig so that the bottom plate 3a of the inner box 3 faces upward. Between the upper edge 8 of the outer box 5 and the lower mold 17, a suitable interposing material 1
8 is placed. After that, a liquid foamed resin is injected into the heat insulating material filling space 31. Then, before foaming starts, the plastic cardboard, that is, the plastic cardboard 33, is placed in the outer box 5.
It is placed on the inner peripheral shelf 5a, and the upper mold 23 of the foaming jig is placed thereon and the mold is clamped. If you keep this state,
The liquid foamed resin described above foams and spreads in the heat insulating material filling space 31 to become a heat insulating material wall or a heat insulating material floor.

FIG. 2 shows the details of the plastic corrugated board 33. In the figure, thin plastic plates 35 and 37 are arranged in parallel, and a plurality of plastic thin plates 39 are arranged in parallel with each other and are spaced apart from each other. The plastic flat plates 35 and 37 and the plastic thin plate 39 are integrally molded and manufactured.
A large number of elongated spaces 41 having a rectangular cross section are formed therein. Since the plastic corrugated board 33 is formed in this way, it has suitable compression elasticity and rigidity, and the plastic flat plates 35 and 37 are the surfaces of the inner peripheral shelf 5a of the outer box 5 and the upper mold 2.
The surface of No. 3 is well followed, and the generation of a gap that causes foam leakage is prevented. Further, even if it should leak, the leaked foamed resin will flow into the space 41 and will not leak outside. This state is shown in FIG. In FIG. 3, the size of the plastic corrugated cardboard 33 is made small, and the case where the gap between the end and the outer box 5 is large is shown. It flows into the space 41 of 33. By emphasizing such a phenomenon, as shown in FIG. 4, the plastic thin plates 39 at both ends may be omitted and the plastic corrugated board 133 may be formed so as to guide the leaked foamed resin thereto.

Furthermore, like the plastic corrugated board 233 shown in FIG.
It is also possible to use those in which 6, 237 are arranged in parallel with each other at intervals and a plurality of plastic thin plates 238, 239 are arranged in parallel with each other and at intervals. Plastic thin plate 238 and plastic thin plate 23
9 extends in a direction intersecting with each other.

In the above-mentioned embodiment, the case where the ice storage part of the ice making machine which is the heat insulating box is manufactured by the present invention is explained. However, the plastic corrugated board is used as a rear plate or a bottom plate of the invisible part of the heat insulating box. A case of using a refrigerator and injecting a foamed resin after attaching a plastic cardboard will be described by taking a case of a refrigerator as an example. In FIG. 6, the exterior (outer box) 42 and the interior (inner box) 43 of the refrigerator are shown in cross section, and both are connected by a joiner 45. At the time of manufacturing, the exterior 41 is surrounded by an outer jig 47 which is a foaming jig, and the interior 43 is supported from the inside by an inner jig 49. A heat insulating material filling space 51 is formed between the exterior 41 and the interior 43, and a plastic corrugated board 53 is arranged at a position outside the exterior 42 without the exterior 42. As shown in FIGS. 7 and 8, an injection hole 55 is formed in the plastic cardboard 53, and the plastic film 5 is formed inside the injection hole 55.
7 is attached so that it can be opened and closed. The plastic film 57 closes the injection hole 55 after the foamed resin has foamed, as will be described later.

Injection hole 55 of plastic cardboard 53
Are aligned with the injection holes 47a of the outer jig 47, and as shown in FIG. 6, the injection pipe of an appropriate injector 61 is inserted to inject the liquid foam resin into the heat insulating material filling space 51. . When the injection work is completed, the injector 61 is pulled out, and the foamed resin is foamed in the heat insulating material filling space 51 and spreads, but a part thereof leaks from the injection hole 55 through between the plastic film 57 and the plastic cardboard 53. Try to. Such leaked foamed resin also has its characteristics, and as shown by the arrow in FIG.
It flows in between 8 and 59 and stays there. That is, the foamed resin does not leak to the outside of the plastic cardboard 53. In the conventional one using the ordinary plastic plate or the zinc iron plate instead of the plastic corrugated board 53, the leaked foamed resin invades between the plate and the outer jig, which causes a problem. Nothing happens. In order to make it easy for the leaked foamed resin to flow between the plastic flat plates of the plastic corrugated board, it is preferable to use plastic corrugated board 153, 253 provided with air vent holes as shown in FIGS. 9 and 10. In FIG. 9 and FIG. 10, an elliptical air hole 161 is formed in the upper plastic plate 159 of the plastic cardboard 153, and a plurality of circular air vent holes 2 are formed in the upper plastic plate 259 of the plastic cardboard 253.
61 are formed respectively.

[0012]

As described above, according to the first aspect of the present invention, the compression elastic laminated plastic plate body is properly pressed by the foaming jig to the proper position of the outer box defining the heat insulating material filling space. Since it is deformed and the gap between the outer box and the laminated plastic plate is completely eliminated, the foamed resin does not leak. According to the invention of claim 2, the plastic corrugated cardboard used as the compression-elastic laminated plastic plate body has a space inside and is beautiful in itself, and has strength and water resistance. However, this is kept in a space and kept out, and at the same time, it protects the heat insulating material as a protective member with a beautiful appearance. Further, according to the third aspect of the present invention, since a single compression-elastic laminated plastic plate can be used to eliminate the gap that causes leakage of the foamed resin, workability is improved, and manufacturing can be performed efficiently and in a short time. You can Further, according to the invention of claim 4, the plastic cardboard is
Since it has the above-mentioned characteristics, it can be left as it is as a protective member for the heat insulating material, so that workability is further improved and leakage of the foamed resin can be completely prevented.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view showing a main part of the embodiment.

FIG. 3 is a partially enlarged view for explaining the operation of the embodiment.

FIG. 4 is a partially cutaway perspective view showing an essential part of a partially modified example of the embodiment.

FIG. 5 is a partially cutaway perspective view showing a main part of still another partial modification of the embodiment.

FIG. 6 is a sectional view showing a second embodiment of the present invention.

7 is an enlarged cross-sectional view of a main part of FIG.

8 is an enlarged perspective view of a main part of FIG.

FIG. 9 is a perspective view showing a partially modified example of the second embodiment.

FIG. 10 is a perspective view showing another partial modification of the second embodiment.

FIG. 11 is a perspective view showing a conventional one.

FIG. 12 is a vertical cross-sectional view showing a cross section of a conventional one.

FIG. 13 is a vertical cross-sectional view showing a method for manufacturing a conventional one.

[Explanation of symbols]

3 ... inner box, 5 ... outer box, 9a ... heat insulating material wall, 9b ... heat insulating material floor, 10 ... molded body, 17 ... lower mold, 23 ... upper mold, 31 ... heat insulating material filling space, 33 ... plastic corrugated cardboard, 35 ... plastic flat plate, 37 ... plastic flat plate, 41 ... space, 42 ... exterior (outer box), 43 ... interior (inner box), 47 ...
Outer jig, 48 ... Inner jig, 51 ... Insulation material filling space, 53 ...
Plastic cardboard, 58 ... Plastic flat plate, 59
… Plastic flat plate, 133… Plastic cardboard,
153 ... Plastic cardboard, 253 ... Plastic cardboard.

Claims (4)

[Claims] 1. An inner box that defines a storage space inside and one side of which is open, an outer box that surrounds the inner box from the side, and one side that is defined by the outer box and the inner box and that faces the outside. In a heat insulating box having a heat insulating material filling space, the surface facing the outside of the heat insulating material filling space is closed with a laminated elastic plastic plate, and a foamed resin is injected into the closed heat insulating material filling space, A heat-insulating box body that is filled. 2. A compression-elastic laminate made of plastic corrugated cardboard comprising at least two plastic flat plates arranged in parallel at a distance and a plurality of plastic thin plates formed at a distance between the plastic flat plates. The heat insulating box according to claim 1, wherein a plastic plate is formed. 3. An inner box that defines a storage space inside and one side of which is open, an outer box that surrounds the inner box from the side, and one side that is defined by the outer box and the inner box and that faces the outside. In manufacturing a heat insulating box having a heat insulating material filling space, the inner box and the outer box are set in a closed space inside a foaming jig, and a surface facing the outside of the heat insulating material filling space and a foaming jig. And a compression elastic laminated plastic plate body is sandwiched between and, and the injected liquid resin is foamed in the heat insulating material filling space. 4. A compression-elastic laminate of a plastic corrugated cardboard comprising at least two plastic flat plates arranged in parallel at a distance and a plurality of plastic thin plates formed at a distance between the plastic flat plates. It uses as a plastic plate, The manufacturing method of the heat insulation box of Claim 3 characterized by the above-mentioned.