Process and apparatus for deformation of solid thermoplastic pol

Details Process and apparatus for deformation of solid thermoplastic pol Process and apparatus for deformation of solid thermoplastic pol

1991-06-27

1992-12-08

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

2641771, B29C 4782

Patent

active

051695898

ABSTRACT:
A process, apparatus and product related to extrusion or other deformation of solid thermoplastic polymers includes using a die or other deformation devices that have an interior passageway of changing cross-sectional shape commencing with an inlet of compact cross-section and ending with an outlet corresponding to the angular shape of the final extruded profile. The die passageway is divided into at least two consecutive stages including a first stage having an interior contour adapted to transform the polymer billet at a low deformation ratio into an intermediate cross-sectional shape proportional in shape to, but greater in cross-sectional area than, the final angular shape and a second stage having an interior contour adapted to transform the intermediate shape to the desired final shape with substantial longitudinal orientation of the polymer, but without substantial lateral shear deformation.

REFERENCES:
patent: 3443007 (1969-05-01), Hardy
patent: 3874837 (1975-04-01), Jamieson
patent: 4238538 (1980-12-01), Manwiller
patent: 4266919 (1981-05-01), Dunnington et al.
patent: 4789514 (1988-12-01), Lo
patent: 4820466 (1989-04-01), Zachariades
patent: 4877393 (1989-10-01), Lo
Research Disclosure 18661, "Process and Die for Extruding Profiled Articles for Fiber Polymer," Composites--Oct. 1979.
Bigg, Polymer Engineering and Science, vol. 28, pp. 830-841 (1988).

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