Method and apparatus for the reduction of the sag and/or of the

Details Method and apparatus for the reduction of the sag and/or of the Method and apparatus for the reduction of the sag and/or of the

1991-06-03

1995-01-24

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Controlling heat transfer with molding material

264 407, 2642896, 264342RE, 264567, 425140, 425144, 4253261, B29C 4792

Patent

active

053840801

ABSTRACT:
The invention refers to a method for the reduction of the sag and/or of the different stress profile of a flattened tubular film web produced by a blown film process and made of thermo-plastic synthetic resin, transversely to its longitudinal direction. For the solution of the problem to provide a method according to which the sag and/or the different states of tension transversely to the tubular film web can be easily reduced or eliminated to a maximum degree, the tubular film web is heated along its width and then cooled and/or stretched. Furthermore, the invention refers to an apparatus for carrying out the method.

REFERENCES:
patent: 3347960 (1967-10-01), Fenley
patent: 3544676 (1970-12-01), Spencer
patent: 3632726 (1972-01-01), Knox et al.
patent: 3700370 (1972-10-01), Hearns et al.
patent: 4189288 (1980-02-01), Halter
patent: 4246212 (1981-01-01), Upmeier et al.
patent: 4277594 (1981-07-01), Matthews et al.
patent: 4325897 (1982-04-01), Zerle et al.
patent: 4436888 (1984-03-01), Copple

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