Fremgangsmåde til kontinuerlig omdannelse af et plant bånd, hvor mindst én side består af et termoplastisk materiale, til et rørformet legeme.

摘要

1,100,423. Bearings; making tubes; rollers. AMERICAN CAN CO. 16 Feb., 1965 [24 Feb., 1964], No. 6707/65. Headings F2A, F2P an F2U. [Also in Divisions B5 and B6] A sheet S1 has the coefficient of friction of one of its surfaces reduced by embossing that surface with a plurality of minute depressions and projections the depths or heights of which are in the range 5-25 microinches. The sheet may thus run more easily over a smooth surface of a skelping mandrel 22, to form a tube. An embossing roller has a hard metal, e.g. chromium, outer layer having a plurality of grit-blasted minute depressions and projections the depth or heights of which are in the abovestated range.