Abstract: In a method for the arc-like shaping of an extruded profiled strand of plastic material at least a section of the strand is heated in a hot air chamber together with a support ledge disposed in spaced relationship from the profiled strand to a temperature permitting the bending of the profiled strand and the strand is then firmly engaged between a support ledge at the inner compression side and a support profile at the other, that is the tension side of the profile strand to form a package, which is then bent while the temperature at the compression side of the profile strand is higher than the temperature at the tension side thereof to prevent the formation of waves in the profile strand walls. The invention also resides in a heating apparatus, which provides for the temperature difference at opposite sides of the profile strand and includes means for engaging the profile strand during bending.

Abstract: In a method for the arc-like shaping of an extruded profiled strand of plastic material at least a section of the strand is heated in a hot air chamber together with a support ledge disposed in spaced relationship from the profiled strand to a temperature permitting the bending of the profiled strand and the strand is then firmly engaged between a support ledge at the inner compression side and a support profile at the other, that is the tension side of the profile strand to form a package, which is then bent. Preferably, the temperature at the compression side of the profile strand is higher than the temperature at the tension side thereof to prevent the formation of waves in the profile strand walls. The profile strand may be surrounded by support profile members, which are heated together with the profile strand. The support profile members are held in engagement with profile strand by auxiliary support profiles, which are held together and which are flexible to permit bending of the whole package.