Method of controlling the film thickness of tubular film produce

Details Method of controlling the film thickness of tubular film produce Method of controlling the film thickness of tubular film produce

1981-04-15

1984-01-10

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 406, 264519, 264167, 2642105, 425141, 425144, 4253261, 425379R, B29D 2304

Patent

active

044252900

ABSTRACT:
In an extruder for making blown tubular film, an extrusion nozzle is divided into equally long segments provided with temperature setting elements. The film thickness is measured over the circumference of the film and film sectors of equal cross-sectional area are allocated to the nozzle segments out of which they were extruded. To produce thick film portions, the associated nozzle segments are cooled accordingly and to produce thin portions the associated nozzle segments are heated accordingly.

REFERENCES:
patent: 3775035 (1973-11-01), Scotto et al.
patent: 3835209 (1974-09-01), Karabedian
patent: 4189288 (1980-02-01), Halter
patent: 4209475 (1980-06-01), Herrington et al.
patent: 4246212 (1981-01-01), Upmeier et al.
patent: 4339403 (1982-07-01), Upmeier et al.
patent: 4339404 (1982-07-01), Upmeier et al.
Plastverarbeiter (No. 10), Jan. 27, 1976, p. 573.

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