Device to lay flat a film tube

Details Device to lay flat a film tube Device to lay flat a film tube

1997-03-05

1999-06-15

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Shaping orifice and downstream work contacting gaseous...

4253261, 425392, 425183, 4253871, B29C 5320

Patent

active

059120223

ABSTRACT:
A device to lay flat a film tube drawn from an inflated film bubble generated in a film blowing system includes lay-flat platens which delimit the film bubble and which are placed against the bubble in the form of a wedge. The platens are positioned in front of the squeeze rollers of a film take-up and winding device and have slip elements arranged transversely relative to the take-up device. A driven reversing frame can be provided to hold the lay-flat platens, support the squeeze rollers, and support guide rollers and turning bars about its rotating axis in a pivoting fashion. In order to decrease the friction between the film tube which is to be laid flat and the lay-flat platens, particularly for a reversing take-up, the slip elements have hollow sections including air blast nozzles or air blast slots facing the film tube to be laid flat. The hollow sections can be connected by lines to an air blast source.

REFERENCES:
patent: 2697852 (1954-12-01), Bailey
patent: 3335208 (1967-08-01), Harris
patent: 3539666 (1970-11-01), Schirmer
patent: 4615666 (1986-10-01), Steinburg
patent: 5437544 (1995-08-01), Achelpohl

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