Continuous paste extrusion method
AssigneeE.I. du Pont de Nemours and Company
InventorsFabrice Aubertin, Daniel N. Levy
Life of this patent
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Abstract
Paste extrusion of lubricated PTFE fine powder is carried out by using the extrusion head of the extruder as the ram for forcing the powder through the extrusion orifice in the extrusion head, i.e. the extrusion head is moved against the powder, whether in particle form or preform form, to cause the extrusion.
Claims10
In the process of paste extruding lubricated PTFE fine powder through an orifice defined by an extrusion head, the improvement comprising obtaining said paste extruding by moving said extrusion head against said lubricated PTFE fine powder.
Process of paste extruding lubricated PTFE fine powder from an extrusion barrel which terminates in an extrusion head which defines an extrusion orifice, said process comprising carrying out said paste extrusion by moving said extrusion head against said lubricated PTFE fine powder and obtaining an extrudate of said lubricated PTFE fine powder as a result thereof.
Paste extrusion apparatus comprising an extrusion barrel having an interior longitudinal passage for receiving lubricated PTFE fine powder, a ram positioned within said passage adjacent one end thereof and in contact with said lubricated PTFE fine powder, an extrusion head positioned within said longitudinal passage at the opposite end thereof and arranged to move towards said ram and against said lubricated PTFE fine powder, said extrusion head defining an extrusion orifice, the movement of said extrusion head against said lubricated PTFE fine powder causing the extrusion of said lubricated PTFE fine powder through said extrusion orifice.
Dependencies are inferred from the claim text.