Process and extrusion apparatus for extruding a plastic web

Details Process and extrusion apparatus for extruding a plastic web Process and extrusion apparatus for extruding a plastic web

1988-09-02

1989-08-15

Thurlow, Jeffery

Boots, shoes, and leggings

100 47, 100168, 100176, 264 407, 264175, 2642102, 364476, 425145, 425327, 425367, 4253823, B29C 4358, B29C 4792

Patent

active

048581399

ABSTRACT:
A plastic web is made by an extrusion apparatus having a plastics screw press, a metering pump with a volume flow depending on the rotation speed, an output die and a rolling unit with calendaring rolls. The flow of a thermoplastic material is regulated with the metering pump. The melt web issuing from the output die is cooled and calibrated. The process uses a metering pump which has substantially linear volume flow/rotation speed characteristics in the regulated range of rotation speeds and together with the rolling unit is part of a common computerized control system. The peripheral speed of the calendaring rolls is controlled so that it is proportional to the rotation speed of the metering pump. The special proportionality factor for the speed ratio is set by a computer which controls the roll speed so that no undesirable thickness variations or other product defects occur. Also additional components including a computer and controller which regulates the roll speed are provided to the extrusion apparatus so that the process according to my invention can be performed.

REFERENCES:
patent: 3359597 (1967-12-01), Bainton
patent: 4028031 (1977-06-01), Seide
patent: 4238432 (1980-12-01), Henderson et al.
patent: 4260578 (1981-04-01), Moody
patent: 4304539 (1981-12-01), Hagiwara et al.
patent: 4428896 (1984-01-01), Stevenson
patent: 4484879 (1984-11-01), Heinz et al.
patent: 4510104 (1985-04-01), Weaver et al.
patent: 4514812 (1985-04-01), Miller et al.

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