| 摘要 |
A process for the continuous manufacture of a closable pipe slotted in the longitudinal direction which is made from a sheet of a thermoplastic foam material involves shaping the sheet in the heated thermoelastic and/or thermoplastic state at right angles to its longitudinal direction into a pipe cross section, and applying the strips of a closure, especially a slide fastener of a thermoplastic synthetic resin, to the mutually facing longitudinal edges of the pipe slot by means of welding, heat-sealing, cementing, or the like. The closure strips, prior to being joined to the shaped, still heated foam pipe, are elongated by the effect of tensile force to the same extent as the foam pipe shrinks during cooling after application of the closure to provide a straight pipe or sheath like structure with a closure means. |
