Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Layered – stratified traversely of length – or multiphase...
Patent
1977-06-29
1979-01-02
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Layered, stratified traversely of length, or multiphase...
425114, B29F 310
Patent
active
041327560
ABSTRACT:
An extrusion head for extruding a plastomeric or elastomeric material on at least two filaments having a diameter of the order of 0.1 mm. and having a high modulus of elasticity while maintaining a constant spacing between the filaments and a process for such extrusion. The head comprises a mandrel with a cylindrical portion and a frusto-conical portion, the mandrel having grooves equal in number to the number of filaments extending along the surfaces of both portions for guiding the filaments. The frusto-conical portion has channels between the grooves for feeding the material between the filaments. A die with an opening having parallel walls for guiding the filaments and having a conical surface spaced from the frusto-conical portion is mounted adjacent the latter to provide a space for flow of the material. A further element adjacent the die may be used to extrude further material over the filaments embedded in the material extruded therebetween.
REFERENCES:
patent: 2105812 (1938-01-01), Gordon et al.
patent: 2331195 (1943-10-01), Jannsen
patent: 2766481 (1956-10-01), Henning
patent: 3121255 (1964-02-01), Henning et al.
patent: 3252183 (1966-05-01), Bronzert
patent: 3404433 (1968-10-01), Krutchen et al.
Brovedan Antonio
Ferrentino Antonio
Sala Angelo
Industrie Pirelli S.p.A.
Thurlow Jeffery R.
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