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US 4,168,942 AGranted
Extrusion apparatus and method
AssigneeApplied Plastics Co., Inc.
InventorFrancis G. Firth
Life of this patent
Estimating the term…
Abstract
A cohesive, non-flowable, plastic mass which is difficult to handle in bulk form is subjected to removal from a container and guided flow into a screw conveyor, compression in the conveyor, and controlled heat input and withdrawal while transported by the conveyor to facilitate ultimate extrusion.
Claims19
For use in extruding viscous material, apparatus comprising
- (a) a disc having a through opening defining an outlet at one side of the disc, there being a material funneling surface at the opposite side of the disc and tapering toward said outlet,
- (b) the disc having an annular periphery sized for relative travel adjacent the bore of a container from which such material is displaced under pressure relatively toward said surface to be channeled through said opening, and
- (c) means to control the temperature of the material being displaced.
Apparatus to extrude viscous material, comprising
- (a) an extrusion cylinder having a bore and an outlet,
- (b) a screw conveyor rotatable in the cylinder to advance material therein and toward said outlet,
- (c) the material receiving space formed between the conveyor and the cylinder bore decreasing in the direction of material advancement in the cylinder by the conveyor, and
- (d) heat transfer means to controllably transfer heat to maintain a viscosity controlled material seal between the conveyor and the cylinder bore.
1 more element
Dependencies are inferred from the claim text.