with continuous development of the plastic project, the requirement on the products surface quality, ageing resistance, the color of the plastic tubing and the sectional materials increase continuously. in order to satisfy the demand of the customers as well as considering the cost, the sectional material surface co-extruding coat and tubing co-extruding technique appear. sj-35¡á25 type single screw plastic extruder which has the characteristic of good plasticization, steady quality, contactor£ºmr liu tel£º82213636 fax£º82210563 email:info@china-zhenxiong.com url£ºhttp://www.china-zhenxiong.com