| 摘要 |
1,103,134. Emboss-moulded tubes. DOW CORNING CORPORATION. 1 April, 1966 [12 April, 1965], No. 14635/66. Heading B5A. [Also in Division B6] Interchangeable copper pipe moulds 17, provided with longitudinally extending indicia forming metal tape 21 are accommodated within a surrounding jacket 11, provided with inlet and outlet means for steam heating and water cooling, whereby a length of heat softenable plastics tubing 22 is inserted within the mould and clamped at either end thereto and is expanded by air or gas pressure, admitted from one end to the interior thereof, into contact with the wall of the mould 17 so that the indicia is embossed into the surface of the tube. Heat shrinkable vulcanized tubing 22, e.g. as described in Specification 1,009,009, is heated within the mould 17 before or after expansion and is subsequently cooled in contact with the mould wall. With non-heat shrinkable polymeric or elastomeric tubing, only the indicia need be heated. Vent 33 may be provided through the mould wall at either end of the tape 21; additional holes may be provided along the tape 21 connecting to a vent duct between the tape 21 and the mould wall. The indicia strip has sufficient thickness at the edges to form a continuous air passage for exhausting air between the tubing and the mould.
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