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With the tenet of “be sincere, be scientific”, Nanjing Chengke company focuses on the works of R&D , design, sale and after-sale for co-rotating & counter-rotating twin-screw extruders, tandem compounding lines and single-screw extruders.
Chengke was founded by senior engineers in twin-screw processing，we have advanced management systems and high-effective operation teams. Our business concept is to analyze the problems, to offer the best solutions and to provide custom mouldings. High-beginning, high-quality, and optimal designs are our company’s characteristics, which can meet the first-class product quality standard as other companies worldwide.
we focus on the works of twin screw:
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A screw extruder for processing melts of synthetic plastic materials
A screw extruder for processing melts of synthetic plastic materials or synthetic plastic material in powder or granulated form to effect mixing, kneading and homogenizing of the material and causing chemical reactions thereof comprises a long main conveyor screw and a short auxiliary screw parallel thereto and disposed in the feed zone of the casing of the extruder. The screws are unidirectionally rotated in tight engagement with each other. Single screw extruders if suitably dimensioned are generally quite satisfactory for carrying out the hereinbefore referred to procedural steps. In fact, the kneading action of twin screw extruder in many instances is superior to that of twin screw extruders the screw elements of which mesh though not with a tight profile. However, single- screw screw extruders have inherently certain disadvantages. The dwell time of the material within the extruder cannot be kept constant within a narrow range and such constancy of the dwell time is very important for most of the processing operations which are to be carried out in the extruders. Moreover, a positive and uniform flow of the material to be processed through treatment zones of the extruder cannot be reliably obtained with single- screw screw extruders, especially if quantity processing is to be carried out.
Twin- screw extruders, the screws of which are in tight engagement and which are unidirectionally rotated produce high quality dispersion and satisfy to a high degree the other aforelisted condition.