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US 4,726,752 AGranted
Apparatus for adjusting the lip opening of an extrusion die
AssigneeConstructiewerkhuizen G. Verbruggen personenvennootschap met beperkte aansprakelijkheid
InventorGuillaume VanDun
Life of this patent
Estimating the term…
Abstract
Method of adjusting the lip opening of an extrusion die for stratiform material, with the characteristic that it consists in the combination of, on the one side, the control of the heating of bar shaped elements (9) which act upon at least one of the lips (6-7) of the lip opening (5), in function of the thickness of the formed material, and on the other hand, the common cooling of several bar shaped elements (9) by forcing a cooling medium along these elements (9).
Claims27
An apparatus for adjustment of a lip opening of an extrusion die, comprising
- at least two lip elements each having a longitudinal axis, said two lip elements defining a lip opening therebetween, a plurality of control units positioned at an angle to said longitudinal axes of said lip elements, a heat expanding arrangement for increasing a thickness of said lip opening by means of thermal expansion of said control units connected to one of said lip elements, a contracting arrangement for decreasing of the thickness of said lip opening by means of cooling of said plurality control units by forcing a cooling medium transversely to said plurality of control units.
Dependencies are inferred from the claim text.