Method and device for thermoforming of containers
AssigneeErca Formseal
InventorsBernard Michelon, Dominique Schwab
Life of this patent
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Abstract
Blanks (12) of thermoplastic material are heated, and a thermoforming step is performed in which the heated blanks are deformed plastically by stretching. Before the thermoforming step, a die-punching step is performed in which the peripheral regions of the blanks are deformed by die-punching while the material of the blanks is held captive on the outside. The installation includes heater means (16) for heating said blanks, thermoforming means (24), and a die-punching tool (26, 28) suitable for deforming the peripheral regions of the blanks before they are thermoformed.
Claims16
An installation for manufacturing objects such as containers by thermoforming from blanks of thermoplastic material having a peripheral region and a central region, said installation including heater means for heating said blanks, and a thermoforming station suitable for plastically deforming the heated blanks by stretching;
- wherein said installation includes a die-punching tool suitable for deforming said peripheral regions of the blanks before they are thermoformed and a wedge piece for holding the blanks captive during the die-punching, wherein said wedge piece is formed by tongs having two arms that can be opened while the blank is being put in place on a die-punching edge, and said arms can be closed before the die-punching so as to define between them an opening suitable for shaping the outline of the blank before said die-punching.
An installation for manufacturing objects such as containers by thermoforming from blanks of thermoplastic material having a peripheral region and a central region, said installation including heater means for heating said blanks, and a thermoforming station suitable for plastically deforming the heated blanks by stretching;
- wherein said installation includes a die-punching tool suitable for deforming said peripheral regions of the blanks before they are thermoformed and a wedge piece for holding the blanks captive during the die-punching, wherein said wedge piece defines an opening in which a blank can be wedged by being placed on a die-punching edge and wherein said wedge piece is carried elastically by the body of a die, and can be pushed back into a setback by said punch.
Dependencies are inferred from the claim text.