Die for the extrusion of material in tube form

Details Die for the extrusion of material in tube form Die for the extrusion of material in tube form

1980-03-24

1981-11-03

Thurlow, Jeffery R.

Plastic article or earthenware shaping or treating: apparatus

With apparatus assembly or dismantling means or with idle part

For extrusion or injection type shaping means

4251331, 425381, 425462, 425466, B29F 304

Patent

active

042983258

ABSTRACT:
A die for the extrusion of a tube of plastic polymer consists of at least two coaxially mounted die parts forming one or more annular die gaps between them from which the tube is extruded. The die parts have two respective axial cylindrical surfaces. There is provided between these surfaces an annular member of material of higher coefficient of expansion than the material from which the die parts are made. As the die becomes heated this annular member also becomes heated and its additional expansion causes its outside diameter to expand and its inside diameter to contract into forcible engagement with the surfaces thereby stabilizing the radial gap between the die lips.

REFERENCES:
patent: 3461501 (1969-08-01), Stewart
patent: 3856448 (1974-12-01), Iijima et al.
patent: 3860372 (1975-01-01), Newman, Jr.
patent: 4185954 (1980-01-01), Murakami et al.

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