Device for producing lay-flat tubes in blown film extrusion...

Details Device for producing lay-flat tubes in blown film extrusion... Device for producing lay-flat tubes in blown film extrusion...

2004-11-12

2008-03-25

Gupta, Yogendra N. (Department: 1791)

Plastic article or earthenware shaping or treating: apparatus

Shaping orifice and downstream work contacting gaseous...

C425S326100, C425S377000

Reexamination Certificate

active

07347680

ABSTRACT:
A lay-flat device of a blown film extrusion installation includes brush rollers in the upper half entirely or partly. The brush rollers include bristles which are directed obliquely outwards and which, on contact with an extruded film tube, exert a slight spreading force on the film, by which folding is avoided.

REFERENCES:
patent: 2005/0056973 (2005-03-01), Ooyama et al.
patent: 85 34 072 (1987-04-01), None
patent: 102 10 845 (2003-04-01), None
patent: 10 2004 038 165 (2005-04-01), None

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