Continuous manufacture of a perforated plastic film

Details Continuous manufacture of a perforated plastic film Continuous manufacture of a perforated plastic film

1984-01-25

1989-01-10

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Perforation by differential fluid pressure; or smoothing,...

264101, 264154, 2642101, 2642102, 264237, 264284, 264348, 264556, 264557, 264562, 264571, 264DIG70, B29C 4778, B29C 5900

Patent

active

047972467

ABSTRACT:
A process is disclosed for the continuous manufacture of a perforated plastic film, where the plastic film is extruded directly from the extrusion unit either onto one roller of a pair of rollers or directly into the gap between a pair of rollers (a perforating/texturing roller and a back-up roller). The hot plastic film is perforated on a roller under the influence of a vacuum and shock cooling by the flow of cold air and the coolness of the back-up roller is carried out during the perforating step, and immediately thereafter. The film is preferably textured at the same time that it is perforated, the immediate cooling setting the texture in the film.

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patent: 4252516 (1981-02-01), Raley et al.
patent: 4259286 (1981-03-01), Louis et al.

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