Qingdao Zhida polymer material Co Ltd has become a joint-stock enterprise integrating with plastic machinery processing and plastic products production over nine years’ unswerving efforts. Based on absorbing the technology of Germany, South Korea and Switzerland, the scientific research personnel of company have brought forth the new. Zhida company has developed a series of plastic machinery products and electric heating fusion tape, electric hot-melt sleeve, heat shrinkable sleeve, 3PE heat shrinkable band, plastic extrusion welder, electric hot-melt welder, plastic welding rod, PE plastic sheet, PP plastic sheet and so on. With the development of science and technology, the requirement for the interface connection of hollow wall coil pipe, double wall corrugated pipe, steel reinforced polyethylene spiral corrugated pipe, thermal insulation pipeline, gas pipeline, and oil pipeline and so on is becoming higher. So the quality of electric heating fusion tape, electric hot-melt sleeve, 3