| 摘要 |
Process for perforating plastics tubes, in particular thinwalled corrugated tubes by a punching or cutting operation, wherein plastics tubes are subjected to a direct or indirect treatment by a cooling fluid prior to the punching and cutting operation, the process to be performed by an apparatus comprising guide means and conveying means for conveying the plastics tubes and further comprising punching or cutting members, whilst? moreover means are provided for effecting the above mentioned cooling treatment. |
