| 摘要 |
930,859. Welding by pressure. ALUMINUM CO. OF AMERICA. March 21, 1961 [July 12, 1960], No. 10237/61. Class 83 (4). In joining ends of aluminium foil webs in a pack roll, the two ends of a first web are lapped and welded using ultrasonic vibratory energy, a strip of material which will not be welded to the webs by ultrasonic vibratory welding is placed over the joined first web and the ends of a second web are lapped and welded using ultrasonic vibratory energy, the strip being interposed between the first spliced web and at least a portion of the lapped ends of the second web. A coil 6 of pack rolled foil, comprising two superposed webs 2, 4 of aluminium foil, is unwound over an idler roll 8 and an anvil roll 10, the foils are separated and rewound in separate coils 12, 14. When a break occurs, the free ends of each web are cut square, a volatile mineral hydrocarbon liquid, e.g. gasoline, kerosine, benzene or naphtha is applied by stencil to the weld area of roll 10, and the ends of the inner web 2 are overlapped on the roll with hydrocarbon between the ends. An ultrasonic welding head 18 is used to produce a weld between the ends of web 2, a strip 20, Fig. 4, of paper, anodized aluminium foil, aluminium sheet, stainless steel foil or steel sheet is applied over the welded ends with the hydrocarbon between the strip and ends, the ends of the web 4 are overlapped with the hydrocarbon between and beneath the ends and another weld is made. The strip 20 is then removed and the webs wound on to rolls 12, 14 or if the strip is flexible it is wound along with the foils until they are separated. The ends may be held tensioned in place by hollow perforated rolls to which vacuum is applied and one of the coils may serve as the welding anvil. Specifications 837,869 and 895,415 are referred to. Reference has been directed by the Comptroller to Specifiation 895,415. |
