What You Need to Know About Conical Twin Screw

1. How does the conical twin extruder screw work?


The conical twin screw rotates in the extruder barrel, and the friction between the material and the two causes the working surface of the extruder screw and barrel to gradually wear: the diameter of the extruder screw is gradually reduced, and thediameter of the inner hole of the extruder barrel gradually increases. In this way, the matching diameter gap between the screw and barrel of the extruder increases a little as the two gradually wear.


However, since the resistance of the head and the manifold in front of the extruder barrel has not changed, this increases the leakage flow of the extruded material when it advances, that is, the amount of material flowing from the diameter gap to the feeding direction increases, resulting in plastic The mechanical output decreases. This phenomenon increases the residence time of the material in the extruder barrel and causes the material to decompose. In the case of polyvinyl chloride, the hydrogen chloride gas produced by decomposition strengthens the corrosion of the screw and barrel of the extruder.


2. The application of conical twin extruder screw


The extruder screw is widely used in the filling, blending, modification, reinforcement of rubber and engineering resins, dehydration treatment of chlorinated polypropylene and super absorbent resin; degradable masterbatch, polyamide polycondensation, polyurethane polyaddition reaction Extrusion; granulation of carbon powder and magnetic powder, insulation materials for cables, sheath materials, low-smoke and low-halogen flame-retardant PVC cable materials and preparation of various silane cross-linked materials, etc. Small models are mainly used for scientific research and teaching. The structural design directly affects the normal operation of the entire machine system.


Because the gearbox of the parallel twin-screw extruder relies on the large thrust of the output shaft for rubber mixing, the center distance of the two extruder screws is relatively small, and the output structure requires high rotation accuracy, so it is difficult to design and process the product.


Our company is specialized in producing parallel and co-rotating modular screw elements, barrels and screws, involving various models from Ø20mm to Ø300mm. After ten years of vigorous development, our company now has a number of advanced CNC machine tools and special processing equipment for screw manufacturing. Now our machining operations have basically realized intelligence and automation. Advanced processing methods, strong technical force, and sophisticated processing technology ensure that the quality and technical indicators of each production fully satisfy customers. If you have any need, please consult us.


  • Six Reasons for the Wear of the Extruder Screw and Extruder Barrel

    Six Reasons for the Wear of the Extruder Screw and Extruder Barrel

    February 24, 20211. During the extrusion production process, because the process temperature is too low or the extruder barrel is mixed with metal foreign matter with the material, the working torque of the extruder s...view
  • Cleaning Methods of Extruder Barrel

    Cleaning Methods of Extruder Barrel

    January 15, 2021The extruder should be cleaned regularly after being used for a period of time. Because a long time of using,a lot of stains will be generated inside the barrel. If these stains accumulate for a long time...view
  • How to Clean the Extruder?

    How to Clean the Extruder?

    February 24, 2021Ⅰ. The structure of extruder screw and extruder barrelThe extruder screw is the key component of the extruder and the heart of the plastic extruder. Due to the need of assembly, there is a matching g...view
  • The Cleaning Methods of Extruder Screw

    The Cleaning Methods of Extruder Screw

    August 3, 2021The extruder screw needs to be cleaned under normal conditions such as changing the color or turning on the machine after shutting down, with black spots.Ⅰ. What are the cleaning methods of extruder ...view
top Inquiry