MULTI-COLOURED & MULTI-LAYERED POLYPROPYLENE OR POLYETHYLENE TUBE COMPOSED OF LAYERS OF THE SAME MATERIAL AND/OR INTERMEDIATE LAYER OF GLASS FIBERS

摘要

Novelty: manufacture of innovative multi-coloured & multi-layered polypropylene or polyethylene tubes for indoor and outdoor use, in heating and cooling systems. Innovative step: no treatment of the external layer is required for welding tubes and accessories together; the external layer is a jacket made of the same material with the tube (polypropylene) and makes part of this last. Advantages: exposition to the sun with null protection; time savings during installation; safe welding.