Apparatus for making sheet elastomers mixed with short fibers

Details Apparatus for making sheet elastomers mixed with short fibers Apparatus for making sheet elastomers mixed with short fibers

1993-09-14

1995-07-04

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Shaping orifice and downstream work contacting gaseous...

264108, 264146, 26421113, 425308, 425315, 425404, B29C 4788, B29C 4734

Patent

active

054294878

ABSTRACT:
A tubular extruder for extruding an elastomeric material mixed with short fibers into a tubular form, with the short fibers circumferentially oriented, a cutter for axially cutting the tubular elastomer, and a development unit for developing the tubular elastomer with a longitudinal slit into a flat form are provided. Arranged between the extruder and the cutter is a guide unit used to guide the tubular elastomer with the help of its tubular section. Air is blown off from the tubular section of the guide unit whereby the tubular elastomer is cooled while at the same time its shrinkage in the circumferential direction is suppressed. The ununiformity of shrinkage is avoidable and the disorientation of short fibers is prevented. Further, the occurrence of flare is prevented by adjusting the tilt angle of the development unit so as to make a distance from a cut point to each lateral edge point at which the tubular elastomer begins to develop into a flat form equal to a distance from a particular point on the circumference of the tubular elastomer opposite the cut point to a middle end point of the tubular elastomer at which the tubular elastomer begins to develop into a flat form.

REFERENCES:
patent: 2421132 (1947-05-01), Tornberg
patent: 2987765 (1961-06-01), Cichelli
patent: 3090991 (1963-05-01), Hathaway
patent: 3469282 (1969-09-01), Barnes
patent: 3591895 (1971-07-01), Britt et al.
patent: 4176155 (1979-11-01), Heisterkamp et al.

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