JPH0648128B2 - Insulation box manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a method for manufacturing a heat insulating box body in which a foam heat insulating material is filled between both inner and outer boxes.

(B) Conventional technology Insulation box such as Japanese Patent Publication No. 53-6183 {25 (5) H513}, Japanese Utility Model 55-7812 (F25D23 / 08), and Japanese Utility Model Publication 56-17354 (B65D81 / 38) The body is provided with a closing member made of paper or plastic called a self-closing cap that closes an injection port formed in the outer box, and the movable tongue of the closing member is injected by the injection pipe when the foaming stock solution is injected. Push the piece into the space between the inner and outer boxes to inject the undiluted foam solution into the space, and after injecting, pull out the injection tube from the injection port, and move the tongue of the closing member toward the injection port by the foaming pressure of the foam insulation. A manufacturing method is shown in which the inlet is closed with a closure member by pushing.

(C) Problems to be Solved by the Invention In the above-mentioned conventional technique, since the closing member is made of a flexible material such as paper or plastic, its movable tongue is capable of overcoming the foaming pressure of the foam insulation material. Then, the foamed heat insulating material leaks, or protrudes outward from this injection hole, causing leakage of so-called urethane, causing a problem that a post-treatment work is required to remove the leaked heat insulating material after the foamed heat insulating material is solidified. It was In particular, recently, together with the trend of speeding up the manufacturing of heat-insulating boxes due to the increase in size of refrigerators and showcases, the foaming (expansion) curing time of the foamed heat insulating material, that is, the urethane rotation time has become faster. -If the above-mentioned closing member is used for the F foaming method, etc., there is a new problem that the foaming undiluted solution first injected during the injection of the foaming undiluted liquid into the space and the space is filled with the foaming undiluted liquid leaks from the injection port. It happened to.

(D) Means for Solving the Problems In order to solve the above problems, the present invention provides a space formed by an inner box (2) and an outer box (3) having an injection port (7) ( Five)
In the manufacturing method of the heat-insulating box body (1) obtained by injecting the foaming undiluted solution of the foam insulation material (6) through the injection pipe (14) into the injection port, the injection is performed on the back surface of the periphery of the injection port (7). An expandable elastic seal member (15) having a smaller diameter than the outer diameter of the pipe and a communication port (16) communicating with the injection port is provided, and the injection pipe (7) and the communication port (16) are connected to the injection pipe ( Provided is a method for producing a heat-insulating box body (1) in which the foaming stock solution is poured into the space (5) to be foamed and solidified while passing through 14).

(E) Action By inserting the injection pipe (14) into the inlet (7) and the through hole (16), the wall surface of the through hole (16) is pressed and its diameter increases, and this pressing force causes A repulsive force is generated in the seal member (15), and the injection pipe (14) is pressed by the seal member (15) from the time of injection of the undiluted foam solution into the space (5) to the time of solidification until the injection port ( Prevent foam leakage from 7).

(F) Example An example of the present invention will be described below with reference to the drawings.

(1) is an inner box (2), an outer box (3), a resin breaker (4) interconnecting the edges of both the inner and outer boxes, and a space defined by the both boxes (5 ) Filled with a foamed insulation material such as hard polyurethane (6) and a heat insulating box, (7) is an inlet formed in the lower part of one side wall of the outer box, (8) is an appropriate place of the breaker It is the exhaust port formed in.

FIG. 1 shows a foaming process diagram of the heat insulation box body. (9) is an inner jig that can be raised and lowered, and (10) is an outer jig whose side wall part is movable. Are fixed as shown. The inner jig (9) has an exhaust passage (1
1), the outer jig (10) is provided with an injection path (12) communicating with the injection port (7). Reference numeral (13) is a foaming machine for injecting the undiluted foaming solution of the foamed heat insulating material (6) into the space (5), which is provided with an injection pipe (14) inserted into the injection port (7). (15) is the inlet
An expandable elastic seal member fixed to the outer box (3) which is the rear surface of the periphery of (7), having a diameter smaller than the outer diameter of the injection pipe (14) and communicating with the injection port (7). Forming (16). This seal member is made of a heat insulating foam resin such as foam polyethylene having a myriad of closed cells, and is attached to the outer box (3) with an adhesive. As the sealing member, soft rubber, plastic, or moltoprene having open cells can be used.

Next, a method for manufacturing the heat insulation box (1) will be described.

As shown in Fig. 1, the inner and outer jigs (9) and (10) are used to form the inner and outer boxes (2).
After fixing (3) by the SF foaming method, the foaming machine (13) is moved so that the tip of the injection pipe (14) is connected to the injection port (7) and the through hole (1).
Face the space (5) through 6) and seal member (15)
Then, the outer peripheral surface of the injection pipe (14) is pressed to close the injection port (7). Then, the foaming undiluted solution of the foam insulation material (6) whose foaming ratio has been increased by the convection method is injected into the space (5) from the injection pipe (14). The injected foaming undiluted liquid starts foaming immediately and becomes foamed insulating material (6) after each time of cream, gel, tack-free and foaming, while the air in the space (5) has its foaming pressure as the foaming undiluted liquid grows. Is gradually pushed out from the exhaust port (8). With the solidification of the foam insulation, the foaming machine (13) is moved to fill the injection pipe (14) with the injection port.
By pulling out from (7) and removing both the inner and outer jigs (9) and (10), the desired heat insulating box (1) can be obtained. When the present inventor injects 7 kg of the foaming stock solution into the space (5) having a volume of 275 using this manufacturing method, the time from the injection to the end of foaming is about 4
It was 30 minutes. In other words, at this time, fill the inlet tube (16) with an injection pipe.
It is the time for inserting (14) and closing the inlet (7) and the passage (16) with the seal member (15). In this embodiment, the injection pipe (14) is separated from the heat insulating box (1) at the time of solidification of the foam insulation (6), but the adhesive strength of the foam insulation (6) becomes weak and It may be separated from the heat insulating box (1) during a tack free time when the heat insulating material becomes inaccessible.
Further, after the foaming, it is added that the injection port (7) is closed with an adhesive tape or a one-touch type cap (17) shown in FIG.

Therefore, according to such a manufacturing method, the injection pipe (14) is inserted into the through hole (16) of the seal member (15) from the time when the foaming heat insulating material (6) is injected to the time when it is solidified. Since the repulsive force of the sealing member obtained by pressing the injection pipe (14) closes the injection port (7), the sealing member (15) can prevent foam leakage from the injection port (7). Moreover, since the seal member (15) itself is provided in the outer casing (3),
The injection pipe (14) can be easily handled during injection.

According to the method of the present invention, a heat insulating box (1) such as a showcase or a chest freezer shown in FIGS. 6 and 7 as well as a heat insulating plate such as a prefabricated panel can be manufactured.

(G) Effect of the Invention The above-described invention has the following effects.

The injection tube is inserted into the opening of the sealing member to close the injection port until the undiluted solution of the foam insulation material is injected into the space and solidified. Even if foam insulation flows into the inlet while it is inserted into the inlet, the sealing member can prevent foam leakage from the inlet, and foam leakage near the inlet and post-processing work due to this foam leakage. And a quick foaming process can be performed.

Since the outer box is provided with a seal member that forms a communication port that communicates with the injection port, the seal member can be automatically deformed with the work of inserting the injection pipe into the injection port. It is possible to press the injection pipe with the repulsive force to close the through hole and the injection port, both the seal member and the injection pipe can be used as the plug member during the foaming work, and the airtight effect at the injection port can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings each show an embodiment of the present invention, FIG. 1 is a longitudinal sectional view of a foaming process showing an embodiment of a method for manufacturing a heat insulating box of the present invention, and FIG. 3 is a vertical cross-sectional view of a main part before foaming, FIG. 4 is a vertical cross-sectional view of a heat insulating box obtained by the method of the present invention, and FIG. 5 is a vertical cross-sectional view of a main part after foaming, 6 and 7
The drawings are perspective views of various heat insulation boxes to which the present invention can be applied. (2) …… Inner box, (3) …… Outer box, (5) …… Space, (6) …… Foam insulation, (7) …… Injection port, (14) …… Injection pipe, (15 ) …… Seal member, (16) …… Passage.

Claims (1)

[Claims] 1. A method of manufacturing a heat-insulating box body, which comprises injecting a foaming stock solution of a foam insulation material into a space formed by an inner box and an outer box having an injection port through an injection pipe through the injection port. In the back surface of the periphery of the injection port, a stretchable elastic seal member having a diameter smaller than the outer diameter of the injection pipe and communicating with the injection port is provided, and the injection pipe is passed through the injection port and the communication port. A method for producing a heat-insulating box body, wherein the foaming undiluted solution is injected into a space and expanded and solidified while the opening is opened by the injection tube.