| 摘要 |
1,141,306. Heat recoverable articles. RAYCHEM CORP. 5 May, 1966 [6 May, 1965], No. 19957/66. Heading B5B. [Also in Divisions D1 and H1] A heat-recoverable article comprises a material having elastic or plastic memory, and a braided reinforcement that is capable of expanding and contracting in the principal direction in which the memory material expands or contracts, the reinforcement lying at an angle not exceeding 45 degrees relative to the axis (as defined) of the article. The braiding may be on the inside, outside or within the memory material. The memory material may be a polyamide, polyester, polyolefin, PTFE, PVC, PVAcetate, polyvinylidenechloride, polyurethane or silicone rubber, all of which may have been cross-linked. Exemplified is a coaxial tube of two heat shrinkable materials, having the reinforcement between them; suitable braiding is made of metal, glass or synthetic fibres. The coaxial tube may enclose an inner electrical conductor (see Division H1). Such a tube is made by extrusion of a first tube, braiding it, and finally extruding an outer tube over the braided tube. The whole assembly is then expanded by inflation and heat-set, whereby it is rendered heat shrinkable.
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