| 摘要 |
1,084,360. Plastic tubes. VULKAN LICHTTECHNISCHE SPEZIALFABRIK G.m.b.H. Oct. 14, 1965 [Oct. 23, 1964], No. 43641/65. Heading F2P. Bending-resisting tubing are produced from synthetic materials, such as a polyester resin reinforced with glass fibres, by winding a band or bands of the material in helical form about a core, the first layer or layers being wound at a steep pitch and the last layer or layers being wound with a relatively small angle of pitch. The core may be of cylindrical or conical form, as in Fig. 1. |
