| 摘要 |
1,007,779. Making tubes. PROCTER & GAMBLE CO. July 13, 1962 [July 13, 1961], No. 27035/62. Heading F2P. A method of forming a tube 20 from sheet material 25 comprises the steps of longitudinally feeding the sheet material and the tube formed therefrom and juxtaposing the longitudinal side edges of the sheet. The side edges are secured together in the interior of the formed tube by applying a continuous filament 49 in a molten condition to the edges, the filament being conveyed in the direction of motion of the tube. The sheet material may comprise a laminate of a metal, e.g. aluminium, tin, and a synthetic plastic, e.g. polyethylene, cellulose acetate, nylon. In the construction shown the material 25 is fed through an outer mandrel 28 on to an inner mandrel 29, the filament 49 of plastics material being fed from an extruder assembly 42, 43 &c. on to an endless conveyer 36. The endless conveyer 36 is driven by roll 37 and guided towards the inside wall of the formed tube by a block 34 and roll 35 which is immersed in cooling water. The cooling water is introduced into the tube 20, through a flat water tube 53, a manifold 54 and a perforated tube 56. A flexible water seal 59 (Fig. 13, not shown), is mounted on the end of tube 56, the water held thereby inflating the tube and allowing the tube to be frictionally engaged by grooved drawbelts 62, 63 held against the tube by plates 68, 69, the grooves being lined with a polyurethane or closed cell rubber foam. The lever 61 of water in the tube is kept constant by a conventional electrically-operated water level controller. A sleeve 50 surrounding the lower end of the inner mandrel 29 is provided with water manifolds 51, 52 to provide a lubricating film between the tube 20 and sleeve 50. The tube 20 is cut into lengths by a conventional cutter 73 which reciprocates on a connecting rod 75 of a driven crank, 74. The machine is actuated from a common motor by gears and driving chains (Fig. 17, not shown). Specification 1,007,780 is referred to. |
