JPS5923538B2 - Container manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the production of synthetic resin containers using a vacuum forming method, and particularly relates to a method for producing containers equipped with a drain port.

SUMMARY OF THE INVENTION An object of the present invention is to reinforce the drain port and to obtain the effect that when connecting, for example, a flexible drain hose to the drain port, the connection is reliably achieved.

The manufacturing method of the present invention will be explained below based on the drawings.

Reference numeral 1 denotes a male mold which has a convex portion 2 for forming a drainage port of the container and has a number of small holes 3 that communicate with an air intake device (not shown). A ring-shaped reinforcing member 4 as shown in FIG. 2 is supported in a state protruding outward from the convex portion 2.

In this case, the reinforcing member 4 is made of hard synthetic resin or rust-free metal, and the protrusion 2 is formed as shown in the male die 1 shown in FIG.
A stepped portion 5 is formed at the intermediate portion of the convex portion 2 by forming the base portion 2A to have a larger diameter than the inner diameter of the reinforcing member 4, and forming the tip portion 2B to have a larger diameter than the inner diameter of the reinforcing member 4. Alternatively, the convex portion 2 may be inserted and supported as shown in FIG.
The reinforcing member 4 may be inserted and supported by forming the reinforcing member 4 into a tapered shape that gradually becomes thinner toward the tip. A synthetic resin sheet 6 covers the upper surface of the male mold 1 and is supported by a clamp device T, and corresponds to the male mold 1 in a softened state by being heated by a heater (not shown).

In this state, the male mold 1 rises, and the synthetic resin sheet 6 is deformed by a vacuum forming method accompanied by the intake operation of the intake device, and the reinforcing member 4 is molded into a shape that matches the male mold 1 so as to be wrapped in the synthetic resin sheet 6. do.

The container 8 formed by this molding method is shown in cross section in FIG. Since it is wrapped in the synthetic resin sheet 6, it can be smoothly removed from the male mold 1 without falling out.

By cutting and opening the tip of the portion of the male mold 1 that matches the tip 2B of the convex portion 2, the drain port 9 of the container 8 is formed as shown in the sectional view in FIG. A portion of the drain port 9 surrounding the reinforcing member 4 is formed with a rib shape 10 that slightly protrudes outward.

Furthermore, the outer diameter dimension A of the base 9A of the drain port 9 and the rib shape 10
The outer diameter dimension B and the outer diameter dimension C of the tip 9B of the drain port 9 are:
The relationship is B>A>C. In the drain port 9 of the container 8 formed by the above-described molding, the reinforcing member 4 is fixed to the relatively thin end portion, that is, the inner surface of the drain port 9 during molding. The reinforcement effect can be applied to the soil, and the drain port 9 will not be deformed, for example, when connecting a soft hose (not shown), and moreover, the above B>C
Due to this relationship, the operation of inserting the hose into the tip 9B of the drain port 9 can be performed extremely smoothly. Furthermore, drain port 9
The rib-like shape 10 formed in the hose also has the effect of preventing the hose from coming off. As described above, the present invention uses a vacuum forming method to form a container and a portion that can serve as a drain port of the container, and a ring-shaped reinforcing member is fixed to the portion that can serve as a drain port at the tip thereof during molding. The reinforcing effect of the drain port, which tends to become thin, can be improved, and the drain port will not be deformed even when a hose or the like is connected, for example. Furthermore, since the outer diameter of the tip of the drain outlet is smaller than the outer diameter of the rib-shaped outer diameter, it is extremely easy to insert the hose into the tip of the drain outlet. This has the advantage of reliably preventing slippage. Therefore, the drain port of a tank formed according to the present invention is effective in a machine having a structure in which a container is provided with a drain port and a hose communicating with the outside is connected to the drain port to accomplish drainage.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a male die used in the molding of the present invention, a reinforcing member supported on the male die, and a synthetic resin sheet supported by a clamping device so as to cover the male die, and FIG. FIG. 3 is a perspective view of a ring-shaped reinforcing member, FIG. 3 is a front view of a male mold of another embodiment and a reinforcing member supported by the male mold, and FIG. 4 is a vertical cross-section of a container made by molding. FIG. 5 is a longitudinal sectional view of a container made by cutting off the tip of the convex portion in FIG. 4. 1...male type, 2,2i...convex part, 3...
...Small hole, 4...Reinforcement member, 6...
・Synthetic resin sheet, 8... Container, 9...
・Drain port.

Claims (1)

[Claims] 1. Prepare a male mold with a convex part and a large number of small holes for forming a drainage port of the container, and a ring-shaped reinforcing member, and the convex part has a base with a diameter larger than the inner diameter of the reinforcing member. At the same time, by forming the tip part to have a smaller diameter than the inner diameter of the reinforcing member, the reinforcing member is inserted and supported in the intermediate part of the convex part in a state protruding outward from the convex part, and the vacuum forming method is performed. The synthetic resin sheet is deformed at the step of molding to form a shape that matches the male die so that the reinforcing member is wrapped in a portion of the sheet, and the tip of the portion that matches the tip of the convex portion is cut and opened. A method for manufacturing a container characterized by forming a container.