Process and device for cooling hollow profiles, especially pipes or tubes, of thermoplastics during extrusion

摘要: Hollow profiles, especially pipes or tubes, manufactured by extrusion of thermoplastics are subjected to both an external cooling and internal during the process in order, on one hand, avoid thermal damage material structure and, other prevent, but at least reduce, stresses within profile walls. The hollow is cooled after emerging from extruder head, externally sizing sleeve following this sprayed water inside means extended region delimited head a plug system fed with water. In 2, upon emergence 1, such manner that it evaporates due effect temperature effective range 3 adjacent whilst vapour condenses cooled, colder areas region, which 8, inner side