| 摘要 |
963,589. Making collapsible tubes; seaming non-metallic sheet material. V. FLASE. Nov. 14, 1960 [Nov. 18, 1959], No. 38998/60. Headings B5A and B5K. In a method of making a tubular container, a preferred end-piece 1 (Fig. 6) of thermoplastic material consisting of a disc with a central delivery nozzle is located within the end portion of a tubular body element 6 also of thermoplastic material and of larger diameter than the end-piece, and the peripheral zone of the endpiece is subjected to heat and axial pressure whereby the zone is reduced in thickness and increased in diameter, and caused to weld to the body element. In Fig. 6, the end-piece 1 is mounted on a metallic core 2 with the tubular element 6 disposed round the core and supported thereon by a shoulder (not shown). Above the core is a hood or mould of insulating material 9, 10 with a metallic insert 7 to serve as the welding tool. The end-piece 1 and member 6 are mounted on the core when it is in a lowered position with respect to the hood, and the upper end 11 of the body member 6 is heated. The core is then raised to reach the position shown where the end 11 of the member 6 has been bent over to engage with the shoulders of the end-piece 1. Further upward movement of the core combined with H.F. heating of the parts using the insert 7 and core 2 as electrodes will cause the end-piece to weld to the body member to give a smooth exterior surface. In an alternative embodiment, the body member is not bent over, but the end-piece is subjected to heat and axially directed pressure, whereby it is reduced in thickness and increased in diameter to engage with the body member 6 and to weld to it. The invention may be made to work continuously by using a plurality of cores and moulds mounted on a circular table (Fig. 10, not shown), the various operations described being carried out automatically. |
