Process for the production of moldings from thermotropic, liquid

Details Process for the production of moldings from thermotropic, liquid Process for the production of moldings from thermotropic, liquid

1991-04-29

1992-10-13

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Orienting or aligning solid particles in fluent matrix material

264171, 2641761, 26421112, 26433121, B29C 4714

Patent

active

051548658

ABSTRACT:
In the production of moldings from thermotropic, liquid-crystalline plastics, the chains of the LC polymer molecules are oriented in at least two preferred directions independent of one another. For this purpose, the polymer melt stream which emerges from an extruder is divided into two part streams which are fed via melt lines to an adapter. A distributing element which is caused to rotate by a drive unit is located in the adapter. The adapter is upstream of a slot die and is connected to the latter. One part stream forms a polymer matrix while the other part stream incorporates in, or is superimposed on, this polymer matrix individual polymer strands at different cross-sectional levels by means of the rotating distributing element. These polymer strands reinforce the polymer matrix. These polymer strands form multiple-pitch helices. The two part streams combined in the adapter enter the slot die and are shaped in the latter to give a multilayer melt film which is extruded through the slot die onto a cooling roller.

REFERENCES:
patent: 4960552 (1990-10-01), Portugall et al.
patent: 5019309 (1991-05-01), Brunnhofer

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