Extrusion methods and apparatus

Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor

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Details

156 54, 15624423, 156500, 264173, 264174, 425113, 425114, B29C 4702

Patent

active

047402610

ABSTRACT:
An extrusion apparatus for providing a plastic jacket (32) about an advang cable core (23) which has been wrapped with a laminated metallic foil (76) includes dual core tubes. An inner one (86) of the core tubes extends into an extrusion chamber and has a free end portion (89) spaced from and disposed concentrically within an end portion (94) of an outer core tube (93). The foil, which is relatively cool and which functions as a shield (26), engages an inner wall of the inner core tube. This causes an overlapped longitudinal seam (78) of the shield to be maintained during the passage of the shielded cable core through the inner core tube. As a result, molten plastic material which is to form the jacket (32) is isolated thermally from the relatively cool shield and is prevented from being cooled prematurely prior to its being tubed about the advancing cable core.

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patent: 3581343 (1971-06-01), Henrikson et al.
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patent: 4134953 (1979-01-01), Dembiak et al.
patent: 4261936 (1981-04-01), Hartig
patent: 4585407 (1986-04-01), Silver et al.
patent: 4595431 (1986-06-01), Bohannon, Jr. et al.

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