| 摘要 |
<p>1,099,365. Embossing; embossing-surfaces. C. GROS. Jan. 25, 1965 [Oct. 23, 1963], No. 41742/63. Headings B6C and B6J. A high-frequency welding process uses a tool made of aluminium, copper, lead, type metal or zinc. The design portions are preferably raised 0À26 inch or less. A tool is made by photoetching, and duplicates are produced by casting from a wetted flong paper pressed against the original so as to constitute a matrix. The tool may be used to weld together two sheets of thin plastics material with an intervening layer of foamed plastics material, or to weld paper or rubber sheet.</p> |
