| 摘要 |
991,368. Non-metallic tubes. MINNESOTA MINING & MANUFACTURING CO. Sept. 15, 1961 [Sept. 19, 1960], No. 33183/61. Heading F2P. [Also in Division B8] A tube 10 from which annular cores for rolls of adhesive tape are sliced (see Division B8) comprises a body 11 formed from helically wound adhesively-bonded plies of chipboard or jute paper, a strip 12 of tough sheet material, e.g. parchmentized paper, helically wound and bonded to body 11, and an overlying helicallywound strip 13 of tough delamination resistant material, e.g. parchmentized paper, metal foil or polyethylene, polypropylene or polyvinyl chloride film, or woven fabric, which is bonded to body 11 and/or strip 12 with its edges abuttingly juxtaposed and positioned over strip 12. The strip 13 presents an outer surface or coating thereon to which the tape will adhere but be readily removable therefrom when the tape is unwound. Specifications 645,057, 683,927 and 843,539 are referred to. |
