B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/642
B29C 67/20 (2006.01) B23P 19/04 (2006.01) B29C 44/32 (2006.01) B29C 47/02 (2006.01) B29C 47/06 (2006.01) B29C 63/18 (2006.01) B29C 65/18 (2006.01) B29C 65/20 (2006.01) B29C 69/00 (2006.01)
Patent
CA 1292085
PROCESS AND APPARATUS FOR CONTINUOUSLY SHEATHING SOLID OR HOLLOW PROFILES, ESPECIALLY TUBES, WITH AN EXTRUDED FOAM JACKET OF THERMOPLASTIC SYNTHETIC RESIN, AND PRODUCTS THEREBY PRODUCED Abstract of the Disclosure 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 ex- truded, slit open, and into the slit foam jacket (3) the solid or hollow profile (1) to be sheathed is con- tinuously coaxially introduced at synchronous speed. The slit foam jacket is closed by welding after the intro- duction. 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). (Fig. 1)
557713
Macrae & Co.
Noel Marquet & Cie.s.a.
Schroder Ralph
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