Extrusion 6-2018

Primac, brand of the Dosi group and sister company of Baruffaldi Plastic Technology, proud of its 60 years of experience in the field of manufacturing of machines for processing smooth and corrugated pipes in PP, PE and tically reaching the welding position, by blocking the pipe against the socket. The pipe and the coupling rotate to exe- cute the welding operations, controlled by a PLC and an operative keyboard with processing recipes for the different types of pipes. Once the welding operation ends, the welding head comes back to the initial position, the mandrel unblocks the pipe and the coupling, so the head comes back in position for a new coupl- ing loading. During this process there is no loss of speed on the extrusion line, as well as no production waste and no problems of ovality. The new concept of cutting device, de- signed ad hoc to solve a specific produc- tion need of an important company ope- rating in the extrusion of coextruded T he first case study has as its object the already known S.R.M. 400/1200, the patented rotary pipe-to-coupling welding machine for corrugated pipes. Based on specific customer requests, a European group leader in the production and marketing of double-wall corruga- ted pipes, the machine has undergone an upgrade that has allowed it to in- crease and make it more productive. The new model has been added to the range of rotary welders produced so far. It can process PE and PP pipes with a diameter from 200 to 1400 mm, with a standard length of 3, 6 or 12 m. The welding process is obtained by add- ing some material between the PE or PP socket to the corrugated pipe of the same material. The head unit, controlled by an electroni- cally controlled motor, advances automa- 30 Pipes and Profiles, Periphery Extrusion 6/2018 Primac once again hits the mark plastic profiles of pipes, takes the techni- cal name of TVP/60 or rapid planetary cutting unit for rapid cutting of PE, PP and PVC pipes with a diameter from 5 to 60mm. The carriage, managed by a brushless motor, synchronizes with the extrusion speed at the cutting signal, and the blade rotates around the tube cutting it, without any removal of material. The rotational speed of the rotor unit is controlled by a brushless motors for the optimization of the number of revoluti- ons, speed of penetration of the blade into the tube and therefore of the cutt- ing speed. The cutting system of the TVP / 60 is ab- solutely innovative thanks to the imple- mentation of a brushless motors system that allows to reach the best precision, Primac Planetary-cutting-unit PVC, reached another important goal in the last year. The R&D activity has improved and enhanced the productivity and quality of the process of two of its best sellers.