RU1804391C - Vacuum forming device for making articles from thermoplastic film - Google Patents

Abstract

Usage: the manufacture of bulk products from a thermoplastic film by vacuum molding. SUMMARY OF THE INVENTION: The vacuum molding apparatus is provided with a bypass valve installed in the lower part of the housing and an elastic gasket located around the perimeter of the working table to seal the gap between the side walls of the table and the walls of the housing. Moreover, in the extreme upper position of the working table, the bypass valve is open for communication of the internal cavity of the housing with the atmosphere, and in the extreme lower position of the table the valve is closed. After heating the film, the table is moved to its highest position, the valve closes, and the internal cavity of the body is isolated from the atmosphere, the air is cooled, vacuum is created, and under the influence of a pressure drop, the film fits the shape and cools. 2 ill. Ј

Description

The invention relates to small-sized, portable vacuum forming devices without an electric vacuum pump, intended for use in small-scale production or as laboratory equipment.

The aim of the invention is to reduce energy consumption and increase reliability.

In FIG. 1 shows a vacuum molding device at the time of heating of the formed film, section; Fig. 2 shows a vacuum forming device at the time of film formation, section.

The vacuum-forming device consists of a heating unit 1, body 2. A frame 3 for pressing a formable film mounted on the housing with the possibility of tight connection of the perforated work table 4, mounted in the housing with the possibility of vertical movement and on which the mold 5 is placed, a bypass valve 6, located in the lower part of the casing, gaskets 7 made of elastic material and ballast 8 to fill the parasitic volume of the casing located under the perforated table in its lowest position. The dotted line shows the position of the film 3. At the end of the heating process. An elastic gasket 7 is located around the perimeter of the working table 4 to seal the gap between the side walls of the table and the walls of the housing.

Vacuum molding device operates as follows.

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The work table 4 is moved to its lowest position, as a result of which the bypass valve 6 is automatically opened, the form 5 is installed on the work table 4, the film 9 is sealed to the device body 2 using the frame 3, the heating unit 1 is installed over the film 9 and the heating is turned on . In the process of heating the film 9, the air in the internal volume of the housing 3 of the vacuum forming device is heated, expanded and blew out through the open bypass valve 6, as well as the heated film 9 sags and reduces the air volume under the molding 7. After the heating process is completed the films 9. The heating unit 1 is removed from the film, the work table 4 is lifted from its lowest position, the bypass valve b is automatically closed and as a result, the internal volume of the housing 2 is isolated from the atmosphere, the air is cooled and the housing 2 is generated vacuum. With further movement of the worktable 4 upward, the film 9 rises relative to its position before closing the valve 6, which causes additional rarefaction in the housing 2 of the device 4 under the influence of a differential pressure, the film 3 wraps around the mold 5 and cools. The product is removed from the mold, and the desktop is lowered to its lowest position. Next, the cycle repeats.

The proposed vacuum molding device without an electric vacuum pump is simple in design, reliable in operation and can be widely used in small-scale production or as laboratory equipment for research purposes.

Claims (1)

The claims A vacuum forming device for manufacturing products from a thermoplastic film, comprising a housing, a clamping frame for clamping a workpiece, sealed with the housing, mounted in the housing with the possibility of vertical movement of the working perforated table with a forming element placed on it, and a heating unit, characterized the fact that, in order to reduce energy consumption and increase reliability in operation, it is equipped with a bypass valve installed in the lower part of the housing and an elastic a gasket located around the perimeter of the working table to seal the gap between the side walls of the table and the walls of the housing, while the bypass valve in the lowermost position of the table is open to communicate with the atmosphere of the internal cavity of the casing and the valve is closed in the lowermost position of the table.