JP3234920B2 - Manufacturing method of thermal insulation / cooling container - Google Patents

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 a heat insulating / cooling container for storing foods and the like in a heat insulating state or for storing fresh foods such as vegetables and milk packs in a cool state.

[0002]

2. Description of the Related Art Conventionally, in a method of manufacturing a heat insulating / cooling container in which a heat insulating material such as foamed polystyrene is inserted between an inner box and an outer box made of a synthetic resin, a heat insulating material is formed between an inner box made of a synthetic resin and an outer box. There is known a method of manufacturing a heat insulating / cooling container in which an inner box and an outer box are welded to each other at a predetermined position by hot-air welding or high-frequency welding after being inserted between the boxes.

[0003]

In the conventional method of manufacturing a heat insulating / cooling container as described above, when the heat insulating material is inserted between the inner box and the outer box to assemble it, air is generated between the inner box and the outer box. And the air sealed between the inner box and the outer box causes deformation such as bulging or dent of the wall surface of the heat insulation / cooling container.

[0004] For example, when the heat-retaining / cooling container is heated in a process such as a hot water washing process and then cooled, pressure is applied to the outer wall of the heat-retaining / cooling container, which causes deformation such as denting of the outer wall of the heat-retaining / cooling container. In the case of rapid cooling in a vacuum state by a vacuum quenching cooler that reduces the temperature and humidity to a low temperature in a short time and suppresses the propagation of various bacteria, the outer wall of the heat retaining / cooling container swells and is greatly deformed. Furthermore, after the heat insulating material such as foamed polystyrene is inserted between the inner box and the outer box, the heat insulating / cooling container may swell due to post-foaming of the heat insulating material such as foamed polystyrene. Furthermore, various causes of deformation of the heat insulation / cooling container can be considered, such as when the inner box and the outer box are deformed due to distortion during molding of the inner box and the outer box made of synthetic resin.

[0005] The present invention solves the problems of the conventional method for manufacturing a heat insulating / cooling container, and provides a method for manufacturing a heat insulating / cooling container in which the heat insulating / cooling container is not deformed by post-processing or the like. It is in.

[0006]

According to the present invention, in order to achieve the above object, a heat insulating material is provided on an outer box having a through hole and a projection having a convex streak at an upper end projected from the bottom. Inserting, then, after the inner box is fitted to the outer box via the heat insulating material, the vicinity of the opening of the outer box and the inner box is welded, and then the nozzle of the air suction device is inserted into the through hole of the projecting portion. After inserting and sucking air trapped between the outer box and the inner box, the protruding section and the inner box are welded by melting the ridge of the above-mentioned protruding section, and then the nozzle of the air suction device is pulled out. This is a method for manufacturing a heat insulating / cooling container in which the through hole of the projecting portion is closed.

Hereinafter, embodiments of the present invention will be described. However, the present invention is not limited to the embodiments without departing from the spirit of the present invention. FIG. 1 is a perspective view including a partial cross-section showing an example of a completed heat insulation / cooling container B. The heat insulation / cooling container B has an inner box I and an outer box E with heat insulation R interposed therebetween. It is assembled by welding near the opening M of the container B.

FIG. 2 is a sectional view of the outer box E, 1 is a groove in which a hanging edge of an opening of an inner box I to be described later is fitted, and 2 is a groove as shown in FIG. A concave portion for a handle is provided, 3 is a peripheral wall of the outer box E, and 4 is a bottom portion of the outer box E. On the outer wall of the bottom part 4 of the outer box E, reinforcing ribs r are provided.
Are protruded as needed.

In FIG. 2, P is a substantially cylindrical protruding portion projecting substantially vertically upward from the bottom portion 4 of the outer box E. FIG. 3 is an enlarged sectional view of the protruding portion P. As shown in (1), a ridge 6 is projected from the upper end 5 of the projection P. A through hole 7 is provided in the protruding portion P, and a nozzle of an air suction device to be described later is inserted from the side of the bulging portion 8 below the through hole 7, and the inner box I of the heat insulation / cooling container B and the outer box I The air trapped between the box E is extracted. In the embodiment shown in FIG. 2, a case is shown in which two projections P are provided. However, such projections P may be provided singly or as required. You can also.

FIG. 4 is a cross-sectional view of the inner box I, and 9 is an inner box I configured to fit into the groove 1 of the outer box E described above.
, A substantially vertical edge hanging down from the vicinity of the opening, 10 is a peripheral wall of the inner box I, and 11 is a bottom surface of the inner box I. As shown in FIG. 4, the bottom part 1 of the inner box I
1 is provided with a thick portion Q that comes into contact with the upper end portion 5 of a protruding portion P projecting from the bottom surface portion 4 of the outer box E when the inner box I is inserted into the outer box E. When a plurality of protruding portions P of the outer box E are provided, a plurality of thick portions Q of the inner box I are provided correspondingly. Although such a thick portion Q can be omitted, it is preferable to provide the thick portion Q because it has an effect of increasing the strength of the heat retaining / cooling container B in combination with the protruding portion P of the outer box E.

Next, a method for manufacturing the heat insulation / cooling container B will be described with reference to FIG. First, after inserting an appropriate box-shaped heat insulating material R into the outer box E, the inner box I is fitted, and the substantially vertical edge 9 of the inner box I is inserted into the groove 1 of the outer box E. Assemble the heat insulation / cooling container B including the box E, the heat insulating material R, and the inner box I. Next, the inner box I and the outer box E are welded by a suitable means such as ultrasonic welding in the vicinity M of the opening of the heat insulating / cooling container B.

Next, a nozzle N of an air suction device (not shown) is inserted from the bulging portion 8 side of the through hole 7 of the projecting portion P,
When the outer box E, the inner box I and the heat insulating material R are assembled, the air trapped between the outer box E and the inner box I is sucked. After the completion of the air suction operation, ultrasonic waves are irradiated from the inside of the heat insulation / cooling container B to the thick portion Q of the inner box I which is in contact with the upper end 5 of the protruding portion P of the outer box E. Then, the ridge 6 protruding from the upper end 5 of the protruding portion P is melted, and the protruding portion P of the outer box E and the thick portion Q of the inner box I are welded.

Next, the nozzle N of the air suction device inserted into the through hole 7 of the protruding portion P is removed, and the bulging portion 8 of the protruding portion P is melted by an appropriate means such as ultrasonic welding.
The heat insulating / cooling container B is manufactured by closing the through hole 7 of the projection P.

[0014]

Since the present invention is configured as described above, it has the following effects. In the manufacturing process of the heat insulation / cooling container, air trapped between the outer box and the inner box was extracted and the pressure between the outer box and the inner box was reduced or evacuated. Deformation such as bulging or denting of the wall surface of the cold storage container can be reliably prevented.

The protruding portion protruding from the upper end of the protruding portion of the outer box is melted, and the protruding portion of the outer box and the thick portion of the inner box are welded and the bulging portion of the protruding portion is melted. It is not necessary to arrange a valve device such as a one-way valve in the through hole of the protruding part, and it is possible to securely connect the outer and inner boxes of the heat insulation / cooling container by a simple method. Low pressure or vacuum can be applied.

[Brief description of the drawings]

FIG. 1 is a perspective view including a partial cross section of a heat insulating / cooling container.

FIG. 2 is a sectional view of the outer box of the present invention.

FIG. 3 is an enlarged sectional view of a protruding portion of the outer box of the present invention.

FIG. 4 is a sectional view of the inner box of the present invention.

FIG. 5 is a cross-sectional view of the heat retaining / cooling container showing an outer box, a heat insulating material, and an inner box assembled.

[Explanation of symbols]

 B ・ ・ ・ ・ ・ ・ Heat preserving / cooling container E ・ ・ ・ ・ ・ ・ Outer box I ・ ・ ・ ・ ・ ・ Inner box P ・ ・ ・ ・ ・ ・ Projecting part Q ・ ・ ・ ・ ・ ・ Thick part R ・ ・ ・ ・.... Insulation material

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 3-43480 (JP, U) JP-A 56-88075 (JP, U) JP-A 63-34983 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) B65D 81/38 B65D 81/18

Claims (1)

(57) [Claims] 1. A heat insulating material is inserted into an outer box having a through hole and a protruding portion having a protruding ridge at an upper end projecting from a bottom portion, and then the inner box is fitted to the outer box via the heat insulating material. After that, the vicinity of the opening of the outer box and the inner box was welded, and then the air trapped between the outer box and the inner box was sucked by inserting a nozzle of an air suction device into the through-hole of the protruding portion. Thereafter, the protrusion and the inner box are welded by melting the protrusion of the protrusion, and then the nozzle of the air suction device is pulled out to close the through hole of the protrusion.・ The method of manufacturing the cold storage container.