DE7001963U - TOOL FOR MANUFACTURING PLASTIC CONTAINERS. - Google Patents

Description

description

The invention relates to a tool for producing HMt. f thin-walled containers «like mugs, from thenroplaetieefcer Plastic film, with which especially containers with an equal massive wall thickness can be manufactured, in particular this uniform wana thickness becomes even at relatively deep ones Reached containers with a steep side wall.

In the production of plastic containers from plastic film is known to be the heated film by a Stretching aid is pre-stretched into the cavity of the mold before the container is formed using compressed air. Doing so tends However, the film to adhere to the bottom of the stretching liner and because it also lies against the upper edge of the mold »:

mainly stretches during mechanical pre-stretching,

the area between these two zones. The container has a base that is reinforced with respect to the side wall and a reinforced edge area. This works see the more off, the deeper the container and the steeper it is the side wall runs.

These disadvantages are avoided by the design of the tool according to the invention. It is also possible to substantially reduce the intake area of the film to enlarge beyond the opening cross-section of the mold and to make optimal use of what is necessary for deep containers with a relatively small opening cross-section. this is achieved according to the invention that a contact of film and mold during pre-stretching is prevented.

An exemplary embodiment of the new tool is described below with reference to the drawing.

It shows:

1 shows a schematic longitudinal section through the tool during pre-stretching.

The previously heated thermoplastic plastic film is placed between the die 3 by raising the lower tool part 5 of the scraper 1 and sealing edge 4 of the counter holder 2 clamped. The stretching aid 6 is set in a downward motion and mechanically pre-stretches the film. Meanwhile Downward movement, compressed air is supplied through an air connection 7 provided in the scraper 1. This air dispersed is in the annular space 8 and then flows through an annular air slot 9, from there welter between the film and the mold 10 to the vent holes 11 through which it escapes, j

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The compressed air prevents this by building up a sliding air cushion a contact between the film and the mold, allowing the film to expand freely and evenly allowed to the sealing edge.

When the stretch helper has reached his lower position, the supply of compressed air is cut off and that follows Shaping and punching out of the container in a manner known per se.

Claims (2)

Protection claims 1) Tool for making containers from thermoplastic Plastic film with a stretching aid (6) in the upper part of the tool for mechanical Pre-stretching is attached, characterized by a stripper (1) which is designed so that in connection with the mold (10) it forms an annular space (8) and an annular air shield (9) and through an air connection (7) via which during the mechanical pre-stretching -by the stretching assistant (6) Compressed air can be passed into the annular space (8). 2) Tool according to claim \ " characterized by a sealing edge (3) on the stripper (l) and a counter holder (2) with a sealing edge (Λ).