JPH09234797A - Method of molding sealed container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method molding a sealed container capable of maintaining high water tightness for a long period of time by joining without gaps members being different in its material such as a coefficient of expansion and melting point, and so on. SOLUTION: A lower member 2 and upper member 3 are molded separately, and they are joined in a manner putting the flange parts of the lower member 2 and upper member 3 spread outward in contact with each other. The lower member 2 and upper member 3 are set within molds B, C being in conformity with the exterior configurations of the lower member 2 and upper member 3 and having only a space for molding the joint parts 4, then the mold B, C are closed. Plasticized synthetic resin D is injected in the space for joint parts 4 of the molds B, C so as to fill the gap, after that, cool-solidification or hardening is effected. Finally, a completed main body 1 (molded item) is removed by opening the molds B, C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for molding a closed container, particularly a container for containing a liquid.

[0002]

2. Description of the Related Art Conventionally, many closed containers made of synthetic resin are made by blow molding which is seamless so that the liquid inside does not leak out. In the blow molding method, plasticized resin is inflated into a bag shape, sandwiched between molds, and pressed against the inner wall of the mold to cool and solidify. There is an advantage that it does not.

[0003]

However, in the blow molding method, since only one kind of resin material is expanded and molded, only a single color material can be manufactured, and there is a problem that the fashionability is lacking. It was As a method of solving this, there is also a method of forming a closed container by heat-welding the openings of the two box-shaped members, but the welded portion is distorted, peeled off, or cracked to leave a gap, The liquid in the tank sometimes leaked. Moreover, if the materials of the two synthetic resins to be welded are different, it may not be possible to weld them.

The present invention has been proposed in view of the above problems, and it is possible to join members having different physical characteristics such as melting points and materials different from each other without any gap, and to maintain high water tightness stably for a long period of time. It proposes a method of molding a closed container capable of

[0005]

In order to solve the above-mentioned problems, in Claim 1, a lower member and an upper member having openings of the same shape are formed by bringing the openings into contact with each other. A method of molding a container, comprising forming an upper member and a lower member each having a flange on the outer peripheral edge of each opening, and placing the upper member and the lower member in a mold with the openings abutting each other, and supplying a plasticized resin. Then, both flanges were covered from the outside and the resin was solidified to form a closed container.

According to a second aspect of the present invention, a hole is provided in each of the flange portions of the upper member and the lower member of the closed container according to the first aspect, and the flange portions of the upper member and the lower member are aligned with the holes. Were contacted with each other, and the supplied resin was caused to flow into both holes to join the flange portions together.

The lower member and the upper member may be molded by any method such as a compression molding method, an injection molding method and a blow molding method. The material of the member of the closed container according to the present invention is preferably synthetic resin in terms of ease of molding, but is not limited thereto, and may be a wooden member, a ceramic member, a metal member, or a combination of these members.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out the present invention will be described below in detail with reference to the drawings. 1 is a perspective view of a portable water container molded using the molding method according to the present invention, FIG. 2 is a plan view of the portable water container of FIG. 1, FIG. 3 is a sectional view taken along the line AA of FIG. 2, and FIG. It is explanatory drawing at the time of shaping | molding the portable water container of FIG.

As shown in FIG. 1, a body 1 of a portable water container.
Is made up of three parts. That is, the joint member 4 covers the lower members 2 of the container 2, the upper member 3 of the container, and the lower members 2 and 3 of the upper member 3 which are in contact with each other so as to cover the flange portions 2a and 3a. In the recess formed in the center of the bottom surface of the main body 1, the main body 1 is held at a high position by being raised during stationary installation
Plate-shaped legs 5 are attached so that they can be folded so as not to get in the way when they are carried. Further, a screw-type large water-filling lid 6, a faucet 7 for taking out water at a lower position on the side portion, and a shoulder belt 8 at a predetermined position on the joint portion 4 are attached to the upper surface of the main body. Further, a cup 9 used as a lid for covering the faucet 7 when carrying it is prepared.

As shown in the sectional view of FIG. 3, the joint portion 4 covers the peripheral edges of the flange portions 2a, 3a of the lower member 2 and the upper member 3 which are in contact with each other so as to have a C-shaped cross section and sandwich them. They are joined in a shape (right side of Fig. 3). In particular, the collar portion 2 shown in FIG.
At the portions of holes 2b and 3b penetrating a and 3a, the joint portion 4
Has a closed cross section (D-shape) to more securely connect the two (FIG. 3, left side). A handle 4a is also formed on the joint portion 4 on the side where the belt 8 is attached.

Next, a method of molding the closed container 1 will be described with reference to FIGS. The lower member 2 and the upper member 3 of the main body 1 are separately molded. A hole 2b ... Is provided at a predetermined location of the collar portion 2a of the lower member 2, and a hole 3b ... Is provided at the collar portion 3a of the upper member 3 with which the collar portion 2a abuts.
・ Is provided. The holes 2b of the lower member 2 and the holes 3b of the upper member 3 are matched with each other, and the flange portion 2a of the lower member 2 and the flange portion 3a of the upper member 3 are matched.
And abut. Set the lower member 2 and the upper member 3 in contact with each other in the molds B and C that match the outer shapes of the lower member 2 and the upper member 3 and leave only a space for molding the joint portion 4, Close molds B and C. The plasticized synthetic resin D is injected into the space for the joining portion 4 of the molds B and C, and the space is filled, and then cooled and solidified or cured. The molds B and C are opened, and the completed main body 1 (molded product) is taken out. Separately molded feet 5 and 5 are attached to the concave portion of the bottom surface of the main body 1, the lid 6 is attached to the upper surface, the faucet 7 is attached to the lower side portion, and finally the attachment portion formed on the joint portion 4 is attached. The belt 8 is attached.

[0012]

According to the method for molding a closed container according to the present invention, since the brim portion formed by combining the openings of the two members is covered with the plasticized resin and solidified, the members having different materials can be joined together without a gap. As a result, high water tightness can be stably maintained for a long period of time.

[Brief description of drawings]

FIG. 1 is a perspective view of a portable water container molded using a molding method according to the present invention.

FIG. 2 is a plan view of the portable water container of FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is an explanatory view of the portable water container of FIG. 1 during molding.

[Explanation of symbols]

 1 Main Body 2 Lower Member 3 Upper Member 2a 3a Collar 2b 3b Hole 4 Joint 5 Foot 6 Lid 7 Faucet 8 Belt B, C Mold D Synthetic Resin

Claims (2)

[Claims] 1. A method for molding a closed container, comprising molding a lower member and an upper member having openings of the same shape by bringing the openings into contact with each other, wherein a collar is provided on the outer peripheral edge of each opening. Form the upper member and the lower member provided, put in a mold with the openings contacting each other, supply plasticized resin to cover both flanges from the outside, solidify the resin to form a closed container. A method for molding an airtight container, which is characterized by being molded. 2. A hole is provided in each of the flange portions of the upper member and the lower member, the flange portions of the upper member and the lower member are brought into contact with each other in a state where the holes are aligned, and the supplied resin is caused to flow into both holes. The method for molding a closed container according to claim 1, wherein the flange portions are joined together.