Title: Apparatus for the preparation of foamed thermoplastic extruded profiles

Abstract: An apparatus for the production of extruded profiles of foamed thermoplasts consisting of an extruder having an extrusion screw and a form-giving extruder head having a flow channel therethrough characterized in that at least part of the length of said flow channel is divided by separating walls having a thickness of 0.2 to 3 mm arranged in the axial direction into individual channels of such a length and cross-section area whereby each individual channel has a nozzle coefficient k of from 0.1 to 2 mm.sup.3 ; as well as the process of extrusion.

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Inventors: Barth, Hans Jochen (Emmerting, DT)

Application Number: 404506
Filing Date: 1973-10-09
Publication_date: 1976-03-02
Assignee: Wacker-Chemie GmbH (Munich, DT)
Primary Class(es): 425/376.1 264/45.9, 264/54, 425/461, 425/817C
Other Classes:
US Patent Ref:

1397571	Nov, 1921	Bowen	425/377.
2886850	May, 1959	Kubiliunas	425/199.
3343214	Sep, 1967	Myers	425/817.
3344473	Oct, 1967	Achterberg et al.	425/380.
3427371	Feb, 1969	Skinner	425/4.
3720572	Mar, 1973	Soda et al.	264/54.
3834849	Sep, 1974	Supran et al.	425/461.

Other Refs:
Primary Examiner: Shore, Ronald J.
Assistant Examiner: Rosenbaum, Mark
Attorney: Hammond & Littell