| 摘要 |
1,037,959. Making tubes. SOCK FIBERGLAS (CANADA) Ltd. Nov. 6, 1964 [Nov. 14, 1963], No. 45386/64. Heading F2P. [Also in Divisions B5 and F4] A flexible, flat tubular member adapted to be subsequently shaped and hardened comprises an inflatable, imperforate, inner tubing of flexible material surrounded by at least one layer of flexible, helically-wound filamentary reinforcing material impregnated with settable plastic. As shown, the tube T comprises a liner 42 which is extruded or formed from a web 42a and has a longitudinal welded seam 42b, and helically wound webs or filaments 43a ... 43d with intermediate longitudinal webs or filaments 44 of fibreglass impregnated with an epoxy or polyester resin; an outer helically wound band or strip of plastics material 45 has an adhesive sealing strip 46 wound over the abutting edges thereof. Insulation in the form of foamable, thermosetting or thermoplastic granules is applied and is enveloped in strips of plastic heat-sealed at the edges thereof. The tube may also include layers of metallic foil, grids or screens. The web 42a is formed into a tube and inflated to act as a mandrel upon which the webs and filaments are wound or otherwise applied, the tube moving continuously through the winding &c. stations of the tubemaking machine to be finally flattened and wound on to a drum for subsequent shaping and hardening to the required tubular product. In a modification, a flattened tube is drawn between pairs of rollers and injected with a settable resin to impregnate the fibreglass layers. |
