Thermoforming and conveyor chain guide apparatus

Plastic article or earthenware shaping or treating: apparatus – Preform reshaping or resizing means: or vulcanizing means... – Including shaping means comprising fluid pressure contacting...

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Details

198692, 198838, 1988603, B29C 4928, B65G 1510

Patent

active

049540661

ABSTRACT:
A chain guide structure for guiding a conveyor chain through a thermoforming machine to protect the chain from plastic chips and other debris. The chain guide includes a support rail structure for supporting an upper run of conveyor chain, and a spring steel cover sheet overlying a track defined by the support rail and in close proximity with the chain to serve as a cover and thereby protect the chain from contamination from foreign material. Additionally, the chain includes a series of spikes to penetrate a plastic sheet and thereby carry it through the machine, wherein the chain guide structure has a width sufficient to permit lateral outward expansion of the plastic sheet as it is heated in the thermoforming machine. An upwardly inclined portion of the guide structure provides a cooling section to permit the plastic sheet to cool as it is carried away from a forming section of the machine.

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