JPS5943699B2 - Method for manufacturing insulated containers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a heat-insulating container, such as a refrigerator, which is improved to have a heat-insulating structure and a required strength.

This type of container began to use synthetic resin molding instead of metal plates, but if it was made into a double-walled structure by rotational molding,
It was difficult to construct a room other than the one requiring a heat-insulating structure at the same time, and the designs that could be adopted for this molded container were severely restricted.

This invention has been made based on the above circumstances, and includes molding a container body with a double wall structure from a synthetic resin by rotational molding, and also a method that allows resin to be supplied to both sides of the partition during the rotational molding. By holding a partition plate suspended in the mold and molding the partition plate during molding of the synthetic resin, a room that requires a heat insulating structure and another room can be configured at the same time. The present invention aims to provide a method for manufacturing an insulating container with a complex structure.

In addition, the present invention provides a method for manufacturing an insulated container that controls the amount of resin supplied to both sides of the partition plate so that the resin layer in one room can be made thicker to ensure the required strength. It is a devised version of Hereinafter, the present invention will be specifically explained based on illustrated embodiments.

In the figure, reference numeral 1 is a container body in which an inner wall portion 2 forms a storage chamber 3 and an outer wall portion 4 forms an outer circumference of the box by rotational molding. It is best if it is made of suitable material. The cavity formed by the inner wall portion 2 and the outer wall portion 4 is formed by a gap 5 surrounding the storage chamber 3 by a partition plate 5 inserted into the mold during rotation molding.
a and a large space 5b.

As shown in FIGS. 1 and 2, the partition plate 5 is suspended and held in the space within the upper and lower molds 8 and 9 by a support leg 7 having a slot 6 formed in the center.

The support pins 7 are provided on the walls of each of the molds 8 and 9.

For this reason, the partition plate 5 is fixed in the mold 8 with its upper and lower edges fitted into the slots 6 of the support pins 7 before the mold is closed.

A pin 7 is screwed into the lower mold 9, and a pin 7 is fitted into the upper mold 8 so as to be vertically slidable, and is pressed downward by a spring 10.

Therefore, while the upper mold 8 is in the upper position, the middle partition plate 5
is supported by upper and lower support pins 7, and the mold can be closed after confirming this supported state. In this embodiment, the resin and air sealing ports 11 are divided into two parts and opened into the mold on both sides of the partition plate 5.

Further, a gap 12 is left between the periphery of the partition plate 5 and the inner wall surface of the mold to allow some circulation even when the mold is closed. After inserting the partition plate 5 into the mold in this manner, synthetic resin material is loaded through the resin and air filling port 11, air is introduced, internal pressure is applied, and rotational molding is performed.

As a result, the partition plate 5 is completely molded with a resin layer,
The gap 5a and the large space 5b can be formed at the same time.

Then, one gap 5a is later filled with a foamed resin such as styrene or polyurethane through the air filling port 11 to form a heat insulating layer 13. When the mold is opened, each pin 7 is removed, leaving behind the partition plate 5 molded with synthetic resin.

The portion where the pin 7 was present is injected with resin through post-treatment. Therefore, the partition plate 5 is not exposed to the outer surface of the container body 1.

The container body 1 taken out from the mold has openings 14 and 15 on the top and side surfaces in order to use the space 5b as an equipment room for a machine or the like. And inside this equipment room,
Capacitor 16, compressor 17, other electrical components 1
8 is equipped, and the storage chamber 3 is equipped with an evaporator 19. In this case, capacitor 16, compressor 1
Since the bracket 20 supporting the parts 7 and the like is attached to the wall in which the partition plate 5 is embedded, the partition plate 5 can function as a sufficient strength member.

In addition, when molding the container body 1, the inner partition plate 5
Resin and air sealing ports 11 for each space partitioned by
As shown in FIG. 6, if the amount of resin filled is changed, even if there is some circulation around the partition plate 5, the resin layer in one space can be made thicker as a whole. .

As described in detail above, the container main body, in which the inner wall portion forms the accommodation chamber and the outer wall portion forms the outer enclosure of the cocoon, is constructed of synthetic resin by rotational molding, and the inner wall Equipped with a partition plate that partitions the inner and outer walls, the partition plate is integrally molded to partition the space composed of the inner and outer wall parts, and the space surrounding the storage chamber is filled with foamed resin. Since we filled it to form a heat insulating layer and formed an equipment room in the remaining space, we obtained a heat insulating effect for the storage room and
The strength of the container body can be increased, and a part of the space during molding can be used to construct an equipment room, making it a container with a complex structure and a refrigerator. Alternatively, it is fully possible to use it as a refrigerator.

Moreover, since the partition plate that partitions the equipment room is molded, it has sufficient strength to hold the equipment inside the equipment room with this partition wall, and can withstand use.

In addition, in this invention, during molding, the middle partition plate was held suspended and a slight flow was allowed around the middle partition plate in the mold, so that the resin went around this area and the edge of the middle partition plate was exposed to the outside. Therefore, the appearance of the product 5 is not impaired by providing this partition plate.

Furthermore, if necessary, during molding, one side of the space inside the mold divided by a partition plate can be filled with more resin.
The required resin thickness can be sufficiently provided for that part.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view of a mold for explaining the manufacturing method of the present invention, Fig. 2 is a longitudinal sectional side view of the same, Fig. 3 is a longitudinal sectional side view of the container body, and Fig. 4 is a longitudinal sectional front view of the same. , FIG. 5 is a longitudinal sectional front view of the finished product, and FIG. 6 is a longitudinal sectional front view of the main part of the mold for explaining another manufacturing method of the present invention. 1...Container body, 2...Inner wall portion, 3
...Containment room, 4...Outer wall part, 5...
...Inner partition plate, 5a...Gap, 5b...
... Space, 6 ... Slot, 7 ... Support pin, 8, 9 ... Molding mold, 10 ... Spring, 11 ... -...Resin and air sealing port, 12...
... Gap, 13... Heat insulation layer, 14, 15.
...Aperture, 16...Capacitor, 17.
... Compressor, 18・゜゜゜゜゜Electrical equipment, 1
9... Evaporator, 20... Bracket.

Claims (1)

[Claims] 1. A double-walled main body is molded from a synthetic resin by rotational molding, and during this rotational molding, a partition plate is placed in the mold in such a way that resin can be supplied to both sides of the partition. Hold a pull-up
In a container in which the inner wall portion of the partition plate forms a storage chamber and the outer wall portion forms the outer circumference of the box, the partition plate is molded during molding of synthetic resin to create a room that requires a heat insulating structure; A method for producing a heat insulating container, characterized in that separate chambers are formed at the same time. 2. The area around the partition plate described in claim 1 is configured to allow some circulation, and the resin is loaded into the mold through the resin and air filling port, and air is blown into the mold. , by rotating the mold vertically and horizontally and forming a resin layer on the inner wall of the mold and the partition plate by centrifugal force, a heat insulating space surrounding the storage chamber and a space for the equipment room are constructed. A method for manufacturing a heat insulating container according to claim 1.