Filtering arrangement for thermoplastics materials
First Claim
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1. Apparatus for extruding and filtering thermoplastic moulding materials, comprising:
- (a) generally cylindrical casing means defining an inlet opening, an axially extending and radially projecting outlet aperture, and a central output opening;
(b) a cylindrical screen unit mounted in said casing means, said screen unit being substantially equal in axial length to said outlet aperture;
(c) drive means for continuously rotating said screen unit, and(d) adjustment means for varying the effective width of said outlet aperture, whereby impurities adhering to said screen unit are ejected from said casing means by reverse flow of material through said rotating cylindrical screen unit during each revolution thereof, and outwardly through said outlet aperture.
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Abstract
A filtering arrangement of thermoplastics extruding apparatus has a rotatable cylindrical screen unit through which material flows radially inwards and is discharged axially and an outlet aperture for impurities which are washed from the screening unit by reverse flow, i.e. radially outward flow, of part of the filtered material. The outlet aperture for the impurities is variable in cross-section by moving an arcuate segment about the axis of the cylinder to control the extent of reverse flow washing.
36 Citations
6 Claims
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1. Apparatus for extruding and filtering thermoplastic moulding materials, comprising:
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(a) generally cylindrical casing means defining an inlet opening, an axially extending and radially projecting outlet aperture, and a central output opening; (b) a cylindrical screen unit mounted in said casing means, said screen unit being substantially equal in axial length to said outlet aperture; (c) drive means for continuously rotating said screen unit, and (d) adjustment means for varying the effective width of said outlet aperture, whereby impurities adhering to said screen unit are ejected from said casing means by reverse flow of material through said rotating cylindrical screen unit during each revolution thereof, and outwardly through said outlet aperture. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification