Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1986-01-24
1988-03-29
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
26417716, 26417719, 2642105, 26421121, 425378R, 425461, B29C 4788
Patent
active
047342404
ABSTRACT:
An improved technique is provided to melt-extrude a liquid crystalline polymer to form large elongated solid shaped articles which exhibit significantly improved polymeric orientation. The molten polymer which is capable of forming an anisotropic melt phase is extruded through a converging die that is provided with at least one enclosed cooling zone at an interior location within the flowing molten polymer wherein a cooling fluid is circulated. This cools the molten polymer adjacent the cooling zone with the concomitant increase in its melt viscosity. Such increased melt viscosity at the interior of the stream of the molten polymer contributes to the uniformity of the polymeric orientation imparted within the converging die as well as during subsequent drawdown outside the extrusion orifice. Such improved polymeric orientation leads to the formation of an improved product (e.g., a three-dimensional rod) which exhibits an unusually high tensile modulus in the direction of its length. The present invention accordingly overcomes difficulties encountered in the prior art wherein melt-extruded shaped articles significantly larger than fibers heretofore often have exhibited substantial internal heterogeneity and a highly oriented skin and a core of a substantially lesser polymeric orientation.
REFERENCES:
patent: 3283041 (1966-11-01), Sommerfeld
patent: 3635624 (1972-01-01), Nakakoshi et al.
patent: 3843290 (1974-10-01), Sender
patent: 3920782 (1975-11-01), Cogswell
patent: 4053270 (1977-10-01), Collier et al.
patent: 4080138 (1978-03-01), Hutchinson et al.
patent: 4216253 (1980-08-01), Bonnebat et al.
patent: 4325903 (1982-04-01), Wissbrun et al.
patent: 4332759 (1982-06-01), Ide
patent: 4468364 (1984-08-01), Ide
patent: 4529565 (1985-07-01), Kasatani et al.
patent: 4574066 (1986-03-01), Gibbon et al.
patent: 4581399 (1986-04-01), Yoon
patent: 4581443 (1986-04-01), Garg
Chung Tai-Shung
Garg Sunil K.
Palangio Daniel
Hoechst Celanese Corporation
Thurlow Jeffery
LandOfFree
Melt-extrusion of polymer which is capable of forming an anisotr does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Melt-extrusion of polymer which is capable of forming an anisotr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Melt-extrusion of polymer which is capable of forming an anisotr will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1088181