Take-off apparatus for formed tubular plastic film

Details Take-off apparatus for formed tubular plastic film Take-off apparatus for formed tubular plastic film

1979-08-16

1981-06-02

Welsh, Maurice J.

Plastic article or earthenware shaping or treating: apparatus

Preform severing means

Means for forming from bulk material, means for severing and...

4253021, 425308, 425315, 425316, 4253261, B29F 300

Patent

active

042708915

ABSTRACT:
An improvement in plastic film formation devices which utilizes a unique cutting and take-off assembly. Flattening, cutting, and paired turning rod assembly move about the axis of the extruded tubular section of plastic in such a manner so as to continuously slice a helical section from the tubular extrusion. The mechanical arrangement of the flattening, cutting, and paired turning rod assembly provides for changing the pitch of the helix cut by changing the position of said assembly relative to the draw rollers.
This arrangement results in a simplified overall mechanical device which can randomize thickness variations across the width of sheets formed and also determine the width of said sheets. It also provides for more control of cooling air required to cool the extruded tube.

REFERENCES:
patent: 2848747 (1958-08-01), Dixon
patent: 3160918 (1964-12-01), Berggren et al.
patent: 3291876 (1966-12-01), Justus
patent: 3305615 (1967-02-01), McGregor
patent: 3342657 (1967-09-01), Dyer
patent: 3557268 (1971-01-01), Beretta et al.
patent: 3716322 (1973-02-01), Kratzert
patent: 3768949 (1973-10-01), Upmeier
patent: 3905736 (1975-09-01), Bringman

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