Apparatus for the manufacture of a continuous film or web of the

Details Apparatus for the manufacture of a continuous film or web of the Apparatus for the manufacture of a continuous film or web of the

1977-12-09

1979-11-13

Rosenbaum, Mark

Plastic article or earthenware shaping or treating: apparatus

Stock pressurizing means operably associated with downstream...

425376B, 425377, 425378R, 425465, B29F 304

Patent

active

041742001

ABSTRACT:
A web of thermoplastic material and a method and apparatus for manufacture of the web are disclosed with the web having a repeating pattern of alternately thick and thin portions. A molten thermoplastic material is extruded through a duct between a first rotatable driven roll and a circular-cylindrical seat. The first driven roll includes a surface having a pattern of recessed portions. The web is transferred from the first driven roll to a second driven roll having a smooth surface. The temperatures of the first and second rolls may be selectively maintained. The thermoplastic material may be extruded through a plurality of ducts leading to the surface of the first driven roll. Transfer of the web from the first roll to the second may be encouraged by means of a vacuum. Furthermore, complete filling of the recesses of the first driven roll by the thermoplastic material may be encouraged by the use of a vacuum.

REFERENCES:
patent: 3107191 (1963-10-01), Brownold
patent: 3347962 (1967-10-01), Dieck et al.
patent: 3423493 (1969-01-01), Klenk et al.
patent: 3439383 (1969-04-01), Meitinger
patent: 3694120 (1972-09-01), Walton
patent: 3801249 (1974-04-01), Milani
patent: 3956056 (1976-05-01), Boguslawski et al.

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