Thermoplastic strip welding equipment comprises a long curved housing around a concentric diverting roll around which the strip passes, the housing including a curved hot air channel

摘要

The second channel (28) with heating elements is to the outside of the housing (16), extends over the whole housing length and has an air inlet (40) near the strip inlet. Connection to the hot air channel (26) is close to the strip outlet. An air outlet channel (34) below the hot air channel is connected to the latter by openings (44) and has slit nozzles (36) over the length. Heated air in the inlet area of the strips to be welded is cooler than in the strip outlet region.