PVC welding – A major challenge
Laizhou, a small town near Qingdao – the city where the sailing competitions were held during the 2008 Summer Olympics Ð is currently undergoing an economic boom. This may be attributed in part to its favourable transport connections and to the unique media attention which it attracted in connection with the Games. Xin Li Composite Materials Co. Ltd has been among those companies to benefit from this unparalleled opportunity and has greatly extended its product range and sales area. It has transformed itself from a simple supplier of corrosion-resistant containers to a complete provider of waste water treatment plants for the chemical, medical and metal industries. Xin Li now maintains a network of branches covering western China, including the far north. PE and PVC are used in almost all products made by Xin Li. Some of the prefabricated products are manufactured using extrusion processing or injection moulding. However, these processes are only suitable for relatively small components and for a limited range of shapes. There has been steadily increasing demand for large containers and pipes with complex forms in the Chinese market. Extrusion welding is the method of choice to join these parts. At Xin Li, PVC pipes are welded with the WELDPLAST S2 PVC hand extruder from Leister. Its display shows both the temperature in the weld zone and for the pre-heat hot air. PVC is very sensitive to fluctuations in temperature during welding; improper temperature control can lead to weak weld joints or overheating. ThatÕs why the WELDPLAST S2 PVC is equipped with an electronic temperature control. No manufacturer can afford to have welding quality issues when producing large containers or large-diameter continuous piping. This is why Xin Li has chosen to use Leister PVC hand extruders Ð in fact, it had been waiting for the launch of […]