Transition elements
Product Name: Transition Elements
Model：φ11 mm ~φ350mm
Applicable Brands：Most well-known extruders on the market
Material: Tool steel, HIP, stainless steel, nickel-based alloy, cobalt-based alloy, etc.
Properties:Wear-resisting, Corrode-resisting and Durable
Transition elements are transitional components in twin-screw extruders that connect different types of functional elements (such as screw elements, kneading blocks, mixing elements, etc.). Their core role is to achieve a smooth transition of materials between different processing sections, avoiding pressure fluctuations, material retention, or shear imbalance caused by sudden structural changes of elements.
Structural Features：
Gradual geometric design: The lead of the flight, the depth of the screw channel, or the tooth structure changes gradually along the axial direction. For example, when transitioning from a double-flighted screw element to a triple-flighted kneading block, the number of flights and the helix angle are gradually adjusted through transition elements to reduce the interference of sudden structural changes on material flow.
Adaptive connection: Both ends are precisely matched with the interfaces of different types of elements, usually adopting the same core shaft diameter and connection standards (such as mortise and tenon structure or bolt fixing), ensuring concentricity of the axis after assembly and avoiding material jamming.
Smooth surface transition: The edges of the flights and the bottom of the screw channels are treated with arc transitions to reduce the risk of material retention in the transition area. Some models retain shallow groove structures to assist in material diversion.
Functional Roles：
Pressure buffering and smooth transition: Between high-shear elements (such as kneading blocks) and low-shear elements (such as single-flighted screws), the gradual structure relieves sudden pressure changes, preventing material degradation or extrusion volume fluctuations caused by local high pressure.
Maintaining flow field continuity: It guides materials to smoothly switch from one flow state (such as axial conveying) to another (such as radial mixing), maintaining the continuity of the flow field and improving overall mixing and conveying efficiency.
Protecting element interfaces: It reduces mechanical wear when different elements are directly connected, prolonging the service life of the equipment, especially reducing stress concentration at the interfaces under high torque conditions.
Applications：
Transition between screw elements and kneading blocks: For example, between the melting section and the mixing section of a twin-screw extruder, transition elements are used to connect single-flighted screw elements and 45° kneading blocks, ensuring that molten materials smoothly enter the high-shear mixing zone.
Switching between multi-flighted elements: In combinations where double-flighted elements transition to triple-flighted ones or vice versa (such as before and after the triple-flighted eccentric kneading block group), transition elements are used to achieve gradual adjustment of the number of flights, avoiding material accumulation due to sudden changes in channels.
Transition between mixing elements and metering sections: Between mixing elements such as TME/ZME and screw elements in the metering section, transition elements reduce shear intensity, allowing materials to enter the extrusion molding link in a stable state and ensuring the dimensional accuracy of products.
Although transition elements do not directly participate in the core processes of mixing or conveying, their role in ensuring process continuity and stability makes them indispensable auxiliary components in complex screw configurations.
Transition elements
Product Name: Transition Elements
Model：φ11 mm ~φ350mm
Applicable Brands：Most well-known extruders on the market
Material: Tool steel, HIP, stainless steel, nickel-based alloy, cobalt-based alloy, etc.
Properties:Wear-resisting, Corrode-resisting and Durable
Transition elements are transitional components in twin-screw extruders that connect different types of functional elements (such as screw elements, kneading blocks, mixing elements, etc.). Their core role is to achieve a smooth transition of materials between different processing sections, avoiding pressure fluctuations, material retention, or shear imbalance caused by sudden structural changes of elements.
Structural Features：
Gradual geometric design: The lead of the flight, the depth of the screw channel, or the tooth structure changes gradually along the axial direction. For example, when transitioning from a double-flighted screw element to a triple-flighted kneading block, the number of flights and the helix angle are gradually adjusted through transition elements to reduce the interference of sudden structural changes on material flow.
Adaptive connection: Both ends are precisely matched with the interfaces of different types of elements, usually adopting the same core shaft diameter and connection standards (such as mortise and tenon structure or bolt fixing), ensuring concentricity of the axis after assembly and avoiding material jamming.
Smooth surface transition: The edges of the flights and the bottom of the screw channels are treated with arc transitions to reduce the risk of material retention in the transition area. Some models retain shallow groove structures to assist in material diversion.
Functional Roles：
Pressure buffering and smooth transition: Between high-shear elements (such as kneading blocks) and low-shear elements (such as single-flighted screws), the gradual structure relieves sudden pressure changes, preventing material degradation or extrusion volume fluctuations caused by local high pressure.
Maintaining flow field continuity: It guides materials to smoothly switch from one flow state (such as axial conveying) to another (such as radial mixing), maintaining the continuity of the flow field and improving overall mixing and conveying efficiency.
Protecting element interfaces: It reduces mechanical wear when different elements are directly connected, prolonging the service life of the equipment, especially reducing stress concentration at the interfaces under high torque conditions.
Applications：
Transition between screw elements and kneading blocks: For example, between the melting section and the mixing section of a twin-screw extruder, transition elements are used to connect single-flighted screw elements and 45° kneading blocks, ensuring that molten materials smoothly enter the high-shear mixing zone.
Switching between multi-flighted elements: In combinations where double-flighted elements transition to triple-flighted ones or vice versa (such as before and after the triple-flighted eccentric kneading block group), transition elements are used to achieve gradual adjustment of the number of flights, avoiding material accumulation due to sudden changes in channels.
Transition between mixing elements and metering sections: Between mixing elements such as TME/ZME and screw elements in the metering section, transition elements reduce shear intensity, allowing materials to enter the extrusion molding link in a stable state and ensuring the dimensional accuracy of products.
Although transition elements do not directly participate in the core processes of mixing or conveying, their role in ensuring process continuity and stability makes them indispensable auxiliary components in complex screw configurations.
