US Patent No: 4,786,181
Number of patents in Portfolio can not be more than 2000
Extruder screw and method for extruding liquid crystalline polymers
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Nov 22, 1988
Issued date -
Nov 16, 1987
filing date -
07/121,285
serial no -
Expired
status
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Abstract
The present invention relates to a novel extruder screw and method for extruding low melt viscosity polymers which form an anisotropic melt phase. In a preferred embodiment, the method and apparatus according to the present invention employ a high rate of rotational speed of the extruder screw in combination with a relatively low compression ratio and a high volume rate of flow through a compression section in order to effectively extrude the low melt viscosity liquid crystalline polymers. The particular design of the screw is dictated by the unique rheology of the polymers which are difficult to effectively move along the helix of the screw due, in part, to the extremely low viscosity. Each dimension and each relative size of the various sections of the screw must be carefully controlled in order to effectively extrude the unique material.
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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 4,201,481 Scrolls for extruding machines | 22 | 1978 | |
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| 4,350,657 Low-energy extruder-pump system | 9 | 1980 | |
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| 4,181,647 Process for extrusion coating of a wire with a cellular thermoplastic resin material | 51 | 1976 | |
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| 4,405,239 Energy efficient extruder screw | 27 | 1982 | |