Process and arrangement including a gear pump for handling thermoplastic liquified material
AssigneeMaag Pump Systems AG
InventorRoger Stehr
Life of this patent
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Abstract
Apparatus and process for handling thermoplastic liquified material is disclosed. A system including an extruder feeding into a degasifying chamber is disposed upstream of a gear pump for pressurizing the material. The extruder gravity delivering, by way of a multiple-billet die, billets to the gears outside of the gear meshing area.
Claims10
A process for handling of a thermoplastic material of uncontrolled varying composition, comprising the steps of degasifying the material by freely exposing the material to a vacuum, and subsequently building up delivery pressure for delivery of the material via a gear pump having two gears meshing in a meshing area by gravity delivering billets of the material uniformly onto the two gears outside the meshing area.
A method for recycling thermoplastic wastes of uncontrolled varying composition and contamination content, comprising the steps of
- (a) extruding the thermoplastic wastes as billets into an evacuated degasing, stage,
- (b) leading the billets along a predetermined length freely exposed for degasing through the degasing stage and gravity delivering the billets into a gear pump having two gears meshing in a meshing area such that the billets are uniformly delivered onto the two gears outside the meshing area, and
- (c) feeding the wastes by the gear pump to a forming tool.
Apparatus for treating thermoplastic material of uncontrolled varying composition, comprising a degasifying shaft which is subjected to a vacuum, a gear pump for the build-up of the delivery pressure of the material, and connected downstream of the degasifying shaft so as to be chargeable with a vacuum with respect to the ambient pressure, wherein the gear pump has two gears meshing in a meshing area, and means for gravity delivering billets of the material uniformly onto the two gears outside the meshing area.
Dependencies are inferred from the claim text.