Constant shear rate extrusion die

Details Constant shear rate extrusion die Constant shear rate extrusion die

2011-01-04

2011-01-04

Del Sole, Joseph S (Department: 1791)

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

C425S133500, C425S376100, C425S461000, C425S466000

Reexamination Certificate

active

07862755

ABSTRACT:
An extrusion die for extruding thermoplastic materials to produce a sheet of substantially uniform thickness, the extrusion die having a manifold width that increases from the centerline toward the die exit or lip. The increasing width manifold arms, with the preland portion, provide a constant shear rate at all areas of the die and a constant residence time, so that every fluid particle path through the die has the same residence time. By having the increasing width manifold arms, the preland area of the extrusion die is decreased, usually by about 30%, often about 40-60%, compared to a Winter die, thus decreasing clam-shelling effect and allowing design and extrusion of wider sheets.

REFERENCES:
patent: 4043739 (1977-08-01), Appel
patent: 4285655 (1981-08-01), Matsubara
patent: 4372739 (1983-02-01), Vetter et al.
patent: 5292463 (1994-03-01), Paul
patent: 5494429 (1996-02-01), Wilson
patent: 6057000 (2000-05-01), Cai
patent: 7056112 (2006-06-01), Ulcej
H.H. Winter et al., Design of Dies for the Extrusion of Sheets and Annular Parisons: The Distribution Problem, Polymer Engineering and Science, Apr. 1986, vol. 29, No. 8.
Rauwendaal, C., The basics of flat-die design, Plastics World pp. 61-63, (Apr. 1991).

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