JPH06190881A - Insulation box inner box manufacturing method - Google Patents

Abstract

(57) [Summary] [Object] To provide a method for manufacturing an inner box of a heat-insulating box, which can manufacture an inner box that can be stored at a low cost without requiring a large storage space. [Structure] A flat plate 5 having a developed shape of an inner box is formed, and folds 9 are formed when the flat plate 5 is formed, so that the inner box can be formed at a desired time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an inner box of a heat insulating box such as a freezer and a refrigerator.

[0002]

2. Description of the Related Art Conventional heat insulation boxes such as freezer and refrigerator are
It is formed by interposing a heat insulating material between the outer box and the inner box. Then, as the inner box manufacturing method of this heat-insulating box, a vacuum forming method in which a resin sheet is set in a mold, and then the inside of the mold is evacuated to bring the sheet into close contact with the mold to form an inner box (Hereinafter referred to as the VF method) or an injection molding method in which a molten resin is injected into a gap formed between molds by an injection molding machine and the resin is forcibly filled into the gap to manufacture an inner box. After injecting the molten resin into the mold,
There is an injection press method (hereinafter referred to as “impression method”) in which a pressing pressure is applied to this resin to form a product by compression.

[0003]

However, among the conventional methods for manufacturing the inner box of the heat insulating box, the injection molding method and the impress method form a deep box such as an inner box of a refrigerator. Therefore, there is a problem that the mold becomes large in size, the manufacturing cost of the mold becomes high accordingly, and the manufacturing cost of the inner box becomes high accordingly.

For this reason, the VF method is generally used. However, in this VF method, an expensive resin such as polystyrene must be used as a material resin, resulting in high material cost and high manufacturing cost. There was a problem that

Further, in the VF method, since the mold used is formed by laminating aluminum castings, there are variations in accuracy of the mold itself, and the degree of vacuum and vacuum during vacuum forming. There is a problem that the accuracy of the inner box varies because the degree of adhesion of the resin to the mold is slightly different depending on the molding time and the like.

Further, in the VF method, since the inner box is molded as a completed product, there is a problem that a wide space is required to store the finished product. In order to solve this storage space problem, there are some cases in which the inner box is stored in a flat plate disassembled shape and the inner box is assembled when desired, but in this case, workability and sealability of the inner box are newly added. Problems will occur.

It is an object of the present invention to provide a method for manufacturing an inner box for a heat insulating box, which can manufacture an inner box that can be stored at a low cost without requiring a large storage space. .

[0008]

DISCLOSURE OF THE INVENTION The present invention relates to a heat-insulating box body formed by interposing a heat insulating material between an outer box and an inner box made of resin, and a flat plate having a developed shape of the inner box. Is formed, and the flat plate is provided with folds so that the inner box can be formed at a desired time by applying the flat plate at the time of forming.

[0009]

With this construction, it is possible to form the inner box at a desired time by forming a flat plate having the expanded shape of the inner box and then making a fold during flat plate formation.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an inner box molding apparatus for molding an inner box by a method for manufacturing an inner box of a heat insulating box according to an embodiment of the present invention.

In the figure, 1 is a fixed mold having a concave portion 2 formed on one side, and 3 is a hydraulic press which is driven by a driving unit (not shown) to move in and out of the concave portion 2 of the fixed mold 1. Is.

Here, the hydraulic press 3 moves while pressing the resin 4 poured into the recess 2 of the fixed mold 1 from an injector 8 described later against the back wall of the recess 2 and the fixed mold 1 and the hydraulic press. 3 is to form a sealed gap having a predetermined width (hereinafter, referred to as a molding gap) for molding the flat plate 5 having the developed shape of the inner box having the opening as shown in FIG. .

In FIG. 1, guide grooves 6 are formed in the upper and lower edges of the recess 2 of the fixed mold 1, and a stopper 7 is held in the guide grooves 6 so as to be slidable in the lateral direction. There is. Here, the stopper 7 is the hydraulic press 3
When it enters the fixed mold 1, it slides inwardly of the guide groove 6 while contacting the hydraulic press 3 and eventually contacts the inner wall of the guide groove 6 to stop the hydraulic press 3 at the flat plate forming position. This is for closing the molding gap.

On the other hand, 8 is an injector attached to the fixed mold 1. The injector 8 injects the molten resin 4 so that the resin 4 faces the recess 2 located at a position distant from the injector 8. Formed resin injection port 1
It is for gradually pouring from a into the recess 2. The amount of the resin 4 injected by the injector 8 at one time is the amount necessary to form one flat plate 5, and the resin 4 is heated at the time of molding as in the conventional VF method. Since it is not necessary, it can be cheap.

Here, the injection of the resin 4 of the injector 8 is performed in accordance with a molding command from a control device (not shown), and the hydraulic press 3 also enters the fixed mold 1 in accordance with the molding command. Resin injection port 1 by this hydraulic press 3
The resin 4 gradually poured from a into the recess 2 is pressed against the back wall of the recess 2.

At this time, since the resin 4 is poured into the recess 2 from the resin injection port 1a when the recess 2 is not in a sealed state, the tightening pressure applied to the hydraulic press 3 and the fixed mold 1 is poured in the sealed state. It is not so large compared to the case where
The size is about 1/4. Therefore, the hydraulic press 3
The fixed mold 1 can be formed of a material such as aluminum which is relatively soft and easy to process.

Further, since the inner box as a finished product is not molded, but only the flat plate 5 having the expanded shape of the inner box is molded, the depth dimension of the hydraulic press 3 and the fixed mold 1 can be narrowed, and the hydraulic pressure can be reduced. The press 3 and the fixed mold 1 can be downsized.

When the hydraulic press 3 further enters the concave portion 2, the resin 4 is pressed by the pressing pressure of the hydraulic press 3.
Is sandwiched between the hydraulic press 3 and the back surface of the recess 2 and gradually spreads in the vertical direction, and eventually the hydraulic press 3 reaches the flat plate forming position to form a forming gap as shown in FIG. The flat plate 5 having an open shape is formed.

Immediately after forming the flat plate 5 in this way, the hydraulic press 3 is withdrawn from the recess 2 and the flat plate 5 is once bent by, for example, a crease forming means (not shown), as shown in FIG. A fold line 9 is made.

Here, the flat plate 5 immediately after being molded in this way
When the folds 9 are formed on the folds, a hinge effect is produced, so that if the flat plate 5 is bent along the folds 9 when desired, the inner box can be formed in a short time. When the inner box is formed, the joint portion of the inner box is fixed by fixing a tape at a predetermined position on the flat plate 5 with a tape, or by fixing a fitting portion by forming a fitting part at the predetermined position on the flat plate 5. Etc.

Next, the manufacturing of the inner box by the method for manufacturing the inner box thus constructed will be described. First, when a molding command is issued from the controller, the resin 4 melted by the injector 8 is gradually poured into the recess 2 from the resin injection port 1a as shown by arrow A in FIG. Then, the entry into the recess 2 is started, and the resin 4 is pressed against the back wall of the recess 2.

In this state, since the concave portion 2 is not hermetically sealed, the hydraulic press 3 and the fixed mold 1 do not have to receive much filling pressure of the resin 8 injected from the injector 10.

The hydraulic press 3 has a stopper 7
While further sliding inward of the guide groove 6, the resin 4 further penetrates into the concave portion 2, and accordingly, the resin 4 is sandwiched between the hydraulic press 3 and the rear surface of the concave portion 2 and gradually spreads in the vertical direction as shown in FIG. .

Then, as shown in FIG. 4, the stopper 7 comes into contact with the inner wall of the guide groove 6 and the hydraulic press 3 stops at the flat plate forming position. At this time, the flat plate 5 injected from the injector 8 is formed. The amount of resin required to do so penetrates into the molding gap, and the flat plate 5 is molded.

Immediately after forming the inner box in this way, the hydraulic press 3 is inserted into the recess 2 as shown by the arrow in FIG.
Then, the flat plate 5 is folded by a fold forming means to prepare for the next molding command. The protrusion 5a extending rearward from the back surface of the flat plate 5 is
Remove after removing.

The flat plate 5 having the folds 9 thus formed is stored in a warehouse or the like until the time of manufacturing the heat insulating box, and at the time of manufacturing, the flat plate 5 is carried out from the warehouse or the like and then bent along the folds 9. As shown in FIG. 6, the joining portion is fixed with the tape 11 to form the inner box 10 having the opening 10a.

As described above, the inner box 10 is not molded as a finished product, but is molded as the flat plate 5 using an inexpensive resin, so that the hydraulic press 3 and the fixed mold 1 can be downsized and the manufacturing cost can be reduced. You can In addition, since it is formed into a flat plate, the time for forming can be shortened and the space for storage can be narrowed.

Although this manufacturing method requires man-hours for forming the inner box, even if such man-hours are applied, the manufacturing cost of the hydraulic press 3 and the like and the time for forming the hydraulic press 3 are shortened. Also, a great merit such as reduction of storage space can be obtained.

In the above description, the case where the fold forming means is used to make the fold 9 on the flat plate 5 has been described, but the present invention is not limited to this, and the fold 9 is formed on the hydraulic press 3. The protrusions may be provided to form the folds 9 when the flat plate 5 is press-molded.

[0031]

As described above, according to the present invention, since the flat plate is formed in the expanded shape of the inner box, the fixed mold and the like can be downsized, thereby reducing the manufacturing cost of the fixed mold and the like. The cost of the inner box can be further reduced.

Further, by forming the inner box into a flat plate, a wide storage space is not required, and by making a crease at the time of flat plate forming, the inner box can be formed at a desired time without forming the inner box as a finished product. It can be formed in a short time.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an inner box molding device for molding an inner box by a method for manufacturing an inner box of a heat insulating box according to an embodiment of the present invention.

FIG. 2 is a perspective view of a flat plate molded by the inner box molding device.

FIG. 3 is a view showing a state where a hydraulic press of the inner box molding apparatus enters into a fixed mold.

FIG. 4 is a view showing a state where the hydraulic press has reached a flat plate forming position.

FIG. 5 is a view showing a state in which the hydraulic press is retracted from the fixed mold.

FIG. 6 is a perspective view of an inner box formed by assembling the flat plates.

[Explanation of symbols]

 3 Hydraulic Press 4 Resin 5 Flat Plate 9 Fold Line 10 Inner Box

Claims (1)

[Claims] 1. A heat insulating box body formed by interposing a heat insulating material between an outer box and an inner box made of resin, wherein a flat plate having a developed shape of the inner box is formed and A method for manufacturing an inner box of a heat-insulating box body, characterized in that a fold line is formed so that the inner box can be formed at a desired time by applying it at the time of molding.