| 摘要 |
The improvement to ES8801097 consists of embossing the band or bands which are finally joined by suitable adhesive or hot welding to form the tube, by means of a hollow roll provided with means of heating and engraved with the circuits to be embossed. The hollows of the engraving are connected to a vacuum system so that as the band passes over the roll it is softened and deformed into the engraved hollows, taking up the corresp. shape before being joined to band.
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