JPS5837887B2 - Method for manufacturing synthetic resin containers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a synthetic resin container that can be stored in a refrigerator or freezer so that it can be put in and taken out, and in particular, the rim of the opening of the container is sufficiently reinforced when the trowel container is formed using vacuum forming method 6. The present invention provides a method for manufacturing a container having the following structure.

Next, embodiments of the present invention will be described in detail based on the drawings.

The illustrated vacuum forming method is one type of plug assist method.

Reference numeral 1 denotes a female mold having a recess 2 of a predetermined shape formed therein to obtain a container of a desired shape, and a large number of small holes 3 opened in the recess 2.
communicates with an intake device 11 and a blower device 12 through a passage 4.

In the passage 4, there is a valve 13 for air intake and blowing.
, 14 are provided.

Reference numeral 5 denotes a reinforcing frame attached to support portions 6 formed around the openings of the four locations 2, and is a metal wire formed into a frame shape that matches the shape of the desired opening of the container.

The attachment to the support part 6 may be temporarily fixed with an adhesive, but if the shape is as shown in the figure, it may be simply placed on the support part 6.

Reference numeral 7 designates an upper mold onto which a synthetic resin sheet 8 is tightly attached using a clamping device 9.

That is, the reinforcing frame 5 is supported on the periphery of the opening of the female mold 1 so as to protrude into the opening of the recess 2, and the upper mold with the synthetic resin sheet 8 attached thereto is closely placed on the female mold 1, and the synthetic resin sheet is placed on top of the female mold 1. 8 (covers the opening of the iron recess 2 and the reinforcing frame 5).

In this state, the synthetic resin sheet 8 is heated with a heater to soften it, and the valve 14 is opened to send pressurized air from the air supply device 12 to cause the synthetic resin sheet 8 to expand upward.

Then, the air blowing is stopped, and then the plug 10 is lowered to deform the synthetic resin sheet 8 into the recess 2 through the space surrounded by the reinforcing frame 5, and press it almost against the inner surface of the recess 2.

In this state, open the valve 13 and use the intake device 11 to
The synthetic resin sheet 8 is formed into a shape that matches the inner surface of the recess 2 by suctioning the inside in the vacuum direction.

As shown in the sectional view of FIG. 2, the molded container 15 has most of the reinforcing frame 5 covered with a synthetic resin sheet 8 around the opening of the container 15.

At this time, the periphery of the upper opening of the container 15 is slightly protruded inwardly by the reinforcing frame 5 so as to narrow the opening, so that when water is collected in the container 15, the water ripples inside the container. This prevents it from overflowing to the outside.

In order to prepare the opening periphery of the container 15, the excess synthetic resin sheet 8 is cut off at the portion indicated by A-χ, thereby completing the desired container 15 as shown in FIG.

In the present invention, when a synthetic resin container is manufactured using a vacuum forming method, sufficient reinforcement can be obtained at the opening periphery, which is easily damaged during use of the container, and the opening periphery can be used to prevent the user from pulling out or carrying the container. Since a grip portion suitable for the case can be made by molding that includes the reinforcing frame, there is an effect that it is convenient to use.

In addition, by supporting the reinforcing frame so as to protrude from the periphery of the opening, the dog part of the reinforcing frame can be covered and retained without having to wrap the synthetic resin sheet all the way to the outer surface of the reinforcing frame, which simplifies the precept type. It is possible to provide a container that effectively utilizes the low cost of the vacuum forming method, such as simultaneously obtaining the effect of preventing stored water from overflowing into the container.

[Brief explanation of drawings]

FIG. 1 is a central vertical cross-sectional view showing the assembled state of each part of the apparatus related to the manufacturing method of the present invention, FIG. 2 is a central vertical cross-sectional view of a container molded by the apparatus of FIG. 1, and FIG. C is a perspective view of the completed container. 1...Female type, 2...Concave, 5...
・Reinforcement frame, γ...Top mold, 8...Synthetic resin sheet, 10...Plug: 15...
container.

Claims (1)

[Claims] 1 A frame-shaped reinforcing frame is supported along the opening periphery 6 of the female recess in which a recess of a predetermined shape is formed, so as to protrude toward the opening of the recess, and the reinforcing frame is covered with the reinforcing frame. A synthetic resin sheet is fitted to the female mold to cover the four openings, and the synthetic resin sheet is deformed through the space surrounded by the reinforcing frame using a vacuum forming method to form a shape that matches the recesses. A method for manufacturing a synthetic resin container, characterized in that most of the reinforcing frame is covered and held by the synthetic resin sheet.