Apparatus for the continuous production of finned tubular bodies of synthetic plastics and the corresponding finned tubular bodies

摘要

This is the continuous production of a tubular profile having a smooth internal surface and an external surface provided with ring fins. According to the invention, the molding shells (20,20 ') of the apparatus used include ribs (36) alternating with grooves (35) for the formation of the desired fins, these ribs and these grooves are of sections transverse circular, and the radius R1 of a groove (35) is less than that R2 of a rib (36).