JPH053300Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to an improved molding device for thermoplastic resin flat plates. More specifically, it is an improved method for manufacturing products such as lighting gloves by molding a pre-printed thermoplastic resin flat plate by vacuum forming or pressure forming to prevent misalignment of the printed pattern due to molding. This invention relates to a molding device.

<Prior art and its problems> From thermoplastic resin flat plates to lighting globes,
When forming a solid object such as a cylinder, elliptical cylinder, prism, truncated cone, truncated elliptical cone, or truncated pyramid, if the object has a pattern, it is expected that the pattern will move on the flat plate due to the forming. The pattern will be printed in the specified layout.

Conventionally, vacuum forming and pressure forming equipment has been used for both straight forming and drape forming.
Whether you use the plug assist molding method, air slip molding method, or reverse draw molding method,
Alternatively, even when a combination of these methods is used, the flat plate is either left to deform freely, is deformed by being pushed by a male mold, or is deformed by being supported by a female mold.
In either case, misalignment of the printed pattern during molding is unavoidable due to uneven thickness of the resin plate, non-uniform softening degree, etc., often resulting in a different pattern arrangement than expected.

For example, make the bottom surface transparent and the sides milky white,
Or, if a pattern is attached, if there is a misalignment between the periphery of the bottom surface and the pattern or milky white part, the product must be discarded as a defective product. The present invention provides a molding device that prevents such inconveniences.

<Structure of the invention> According to the invention, a thermoplastic resin flat plate can be used as a cylinder, an elliptical cylinder, a prism, a truncated cone, a truncated elliptical cone, or a truncated pyramid (the pillars and truncated pyramids have curved top surfaces). include)
a mold body for holding the top surface forming portion of the resin flat plate; the resin flat plate has a shape that slides up and down within the mold body and matches the top surface forming portion of the resin flat plate; A box body supported by elastic means that contacts only the top surface portion of one side and is biased toward the resin flat plate, and the resin flat plate has a shape that matches the periphery of the top forming portion of the resin flat plate. and a driving means for the holding means, and the holding means moves against the elasticity while holding the resin flat plate under pressure. A molding apparatus is provided that is characterized by molding a resin flat plate.

The present invention can be applied to both vacuum forming and pressure forming.

<Embodiment> Next, the present invention will be specifically explained by one embodiment with reference to the drawings.

FIG. 1 is a schematic cross-sectional view illustrating one embodiment of the present invention. The device of the present invention consists of a main body 1, an exhaust side holding means 2 which is supported by an elastic means 4 and slides up and down, and a holding means (box) 2 on the opposite side. Main body 1 is table cylinder shaft 1
0 and is connected to the vacuum system by a hose 12. The main body 1 and the exhaust side holding means 2 are provided with ventilation holes 6 for exhaust. The holding means 3 on the opposite side correspond to the plug of a conventional device and are supported on a plug shaft 11. The lower and upper holding means 2, 3 are shaped to match the top surface of the article to be molded (for example a lighting globe). The main body 1 is provided with a stopper means 5 for restricting the movement of the lower holding means 2.

Heated thermoplastic resin flat plate 9 to be molded
is held and supported by the clamp 7 and the lower fixing means 2
and the upper holding means 3. When the upper holding means is moved downward relative to the main body 1, the upper holding means 3 and the lower holding means 2 sandwich and hold the thermoplastic resin flat plate 9, and in this state, the molding operation is performed with the operation of the vacuum system. . The situation is shown in FIG.

For example, if the article to be molded is a lighting globe and the printing 9 is applied only to the side wall surface and there is no printing on the top surface (bottom surface) as shown in the figure, the top surface without the printing Since these are fixed by the upper and lower fixing means, only this part will not be deformed, and the boundary between the printed part and the non-printed part will not shift.

It is obvious that the above-mentioned principle can be applied to a pressure forming apparatus, and a person reading this specification can easily manufacture a pressure forming apparatus to which this principle is applied. That is, instead of reducing the pressure inside the mold body, the space within the frame body (upper holding means) 3 may be pressurized.

[Brief explanation of the drawing]

Fig. 1 is a schematic cross-sectional view illustrating one embodiment of the present invention. Fig. 2 is a similar drawing showing the operation state of the apparatus of Fig. 1. In these drawings, 1 .... mold body, 2 .... exhaust side fixing means, 3
...... fixing means on the opposite side, 4... elastic means, 5...
Stopper, 6...ventilation hole, 7...clamp, 8
......Thermoplastic resin plate, 9...Printed portion, 10...
...table cylinder shaft, 11...plug cylinder shaft, 12...vacuum hose.

Claims (1)

[Claims for Utility Model Registration] 1 Thermoplastic resin flat plate as a cylinder, elliptical cylinder, prism, truncated cone, truncated elliptical cone, or truncated pyramid (columns and truncated pyramids include those whose top surfaces are curved surfaces) a mold body for holding the top surface forming portion of the resin flat plate; the resin flat plate has a shape that slides up and down within the mold body and matches the top surface forming portion of the resin flat plate; A box body supported by elastic means that contacts only the top surface portion of one side and is biased toward the resin flat plate, and the resin flat plate has a shape that matches the periphery of the top forming portion of the resin flat plate. and a driving means for the holding means, and the holding means moves against the elasticity while holding the resin flat plate under pressure. A molding device characterized by molding a resin flat plate. 2. A vacuum forming apparatus according to claim 1, in which the internal space of the mold body is reduced in pressure. 3. The air pressure forming apparatus according to claim 1 of the utility model registration, in which the internal space of the frame body is pressurized.