APPARATUS FOR THE CONTROLLED EXTRUSION OF MULTI-COMPONENT SYNTHETIC RESINOUS BODIES

• US 3,687,589 A
• Filed: 07/20/1970
• Issued: 08/29/1972
• Est. Priority Date: 07/20/1970
• Status: Expired due to Term

• Current Assignee: Walter J. Schrenk
• Original Assignee: Walter J. Schrenk
• Inventors: Schrenk, Walter J.
• Primary Examiner(s): Overholser, J. Spencer
• Assistant Examiner(s): Tobor, B. D.
• Application Number:
  US05/056,503
• Time in Patent Office: 771 Days
• Field of Search: 264/171,176 18/13P,2F,15R,15F
• US Class Current: 425/131.1
• CPC Class Codes: B29C 48/08 flexible, e.g. films
• CPC Class Codes: B29C 48/21 the layers being joined at their surfaces
• CPC Class Codes: B29C 48/307 specially adapted for bringing together components, e.g. melts within the die

Abstract

In extrusion of layered film where a layered stream is discharged from a single die, control of the volume of material passing through the feed ports is obtained by introducing varying mechanical shear rates to at least a portion of the individual layers of the composite stream.

Claims

1. An apparatus for the simultaneous extrusion of at least two diverse synthetic resinous materials into a layered composite body, the apparatus comprising a first heat plastified synthetic resinous material supply means adapted to deliver a first heat plastified stream, a second heat plastified synthetic resinous material supply means adapted to deliver a second heat plastified stream, means to divide the first stream and means to divide the second stream into a plurality of substreams, each means having an entrance and an exit, means to recombine the substreams in a desired relationship into a composite layered stream, means to deform the composite layered stream into a desired configuration, the improvement which comprises stream shearing means for selectively applying a shearing force, by continual mechanical motion of a surface of said stream shearing means in contact with a stream, wherein the stream shearing means comprises at least one moveable body positioned adjacent to, and in spaced relationship to the entrance of a dividing means.

2. The apparatus of claim 1 wherein the means to selectively apply a shearing force comprises at least one rotating element.

3. The apparatus of claim 1 wherein the means to selectively apply a shearing force is a reciprocating element.

4. The apparatus of claim 1 wherein the means to deform the composite stream into a desired configuration comprises a housing defining a passageway, the passageway having an entrance portion and a discharge portion, the entrance and discharge portions being of elongate cross-sectional configuration and the cross-sectional configurations lying in planes generally normal to the axis of the passageway, the longitudinal axis of the entrance and discharge cross-sectional configurations being disposed in planes generally normal to each other and containing a longitudinal axis of the passageway.