3-layer sandwich structured pipes are produced with the co-extrusion block TW 4-10 and save up to 30 % material costs. Foamed or low cost formulations containing regrind or lower levels of expensive pigments and stabilizers for the middle layer reduce costs while maintaining the necessary ring stiffness of the pipe. Up to 80 % of the wall thickness can be made of regrind material with minimum inner and outer pipe layers of 0,5 mm. With more than 150 TW 4-10 co-extrusion Systems sold, Theysohn is able to guarantee highest levels of experience and assistance incl. special formulations.
Using virgin or recycling material has been the major advantage of this technology. Standard fitting systems, as known for compact pipes, can be used. The output ranges from 200 to 2000 kg/h using a combination of two or three extruders in a production setting. Highest capacity sold is 20 m/min. Smaller dimensions are using double-strand technology. Another big advantage of Theysohn is the low-cost formulation recommended.