Process for continuously sheathing solid or hollow profiles with

Details Process for continuously sheathing solid or hollow profiles with Process for continuously sheathing solid or hollow profiles with

1988-01-20

1989-07-04

Dawson, Robert A.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156 54, 15624413, 15624418, 15624427, 156259, 156294, 264146, B32B 3100

Patent

active

048447625

ABSTRACT:
A process and an apparatus for continuously sheathing solid or hollow profiles (1), especially tubes, with an extruded foam jacket (3) of thermoplastic synthetic resin is provided. To this end a foam jacket is extruded, slit open, and into the slit foam jacket (3) the solid or hollow profile (1) to be sheathed is continuously coaxially introduced at synchronous speed. The slit foam jacket is closed by welding after the introduction. The process steps of slitting the foam jacket, introducing the profile to be sheathed into the foam jacket, and closing the foam jacket (3) by welding are to be carried out at temperatures of the foam jacket above the glass transition temperature of the synthetic resin material of the foam jacket. After the slit in the foam jacket (3) has been closed by welding, the jacket cools down and snugly shrinks onto the profile to be sheathed. According to a further embodiment said foam jacket (3) can be additionally provided with a protective film skin (5) extruded thereon in order to thus increase the impact resistance, the scratch resistance, and the water vapor impermeability of the foam jacket (3).

REFERENCES:
patent: 1405998 (1922-02-01), Gammeter
patent: 2195046 (1940-03-01), Best
patent: 3903233 (1975-09-01), Dougherty
patent: 4201607 (1980-05-01), Rautenberg et al.
patent: 4322260 (1982-03-01), Conlon
patent: 4713271 (1987-12-01), Searl et al.

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