Wiping spinneret face with cooled wiper
AssigneeE. I. Du Pont de Nemours and Company
InventorJoe Alvin Foley
Life of this patent
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Abstract
Accumulated deposits are removed from the face of a spinneret by periodically manually wiping the face of the spinneret with the blade of a hand held wipe stick. Cooling the blade just before use decreases the smearing of the polymer melt and increases the wipe cycle. Dry ice is the preferred cooling medium.
Claims4
In a melt spinning process that includes the steps of extruding a molten polymeric material under pressure through holes formed in the face of a spinneret and periodically wiping the face of the spinneret with the blade of a wipe stick to remove deposits of decomposed polymeric material, the improvement comprising:
- cooling the blade of the wipe stick to a temperature below 0.degree.C. before using thereby reducing the tendency of smearing the molten polymeric material across the face of the spinneret during wiping.
Dependencies are inferred from the claim text.