Apparatus for making shrinkable tubing

Plastic article or earthenware shaping or treating: apparatus – With means applying coating material to work or work contact... – Separate means applying material directly to shaping means,...

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Details

4251748R, 425501, 425503, 425505, 425508, 425509, 425523, 425532, 425535, 425392, B29C 1707, B29D 2303, B29D 2304

Patent

active

045197598

ABSTRACT:
Long lengths of a heat-shrinkable sleeve for use in splicing electrical cables and the like are made in a continuous process. The sleeve is formed around a permeable core, and the core and sleeve are advanced together in an axial direction, the leading end of the advancing sleeve being hermetically sealed. The core and sleeve pass through a heating station, thereby heating a portion of at least the sleeve, and a fluid is introduced under pressure into the core, thereby internally pressurizing the sleeve to effect a radial expansion of the heated portion thereof. The core and sleeve then pass through a cooling station, thereby cooling the expanded sleeve to stabilize it. A stress graded compound also for use in splicing electrical cables and the like is made by heating a dimethyl silicone liquid to remove entrapped gas and mixing the liquid with a silicone carbide powder having a particle size capable of passing through a 400 mesh screen. The volumetric proportion of powder to 1 part liquid is within the range of 0.5 part to 2.0 parts.

REFERENCES:
patent: 2393452 (1946-01-01), Bailey et al.
patent: 2936491 (1960-05-01), Hamlin
patent: 2969836 (1961-01-01), Ceriat
patent: 3243850 (1966-04-01), Zieg
patent: 3659987 (1972-05-01), Mixell et al.
patent: 3809522 (1974-05-01), Kramer
patent: 3844700 (1974-10-01), Sokolow
patent: 3859408 (1975-01-01), Voss
patent: 3914101 (1975-10-01), Stefanka

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