What are the significant differences in the design features of High Speed ​​Screw compared with conventional screws?

Compared with conventional screws, High Speed ​​Screw has the following significant differences in design:

Thread depth and thread spacing:

High Speed ​​Screw: Usually has shallow screw grooves and large thread spacing to adapt to the rapid movement of materials during high-speed operation. This design can reduce the residence time of materials in the screw, prevent excessive shearing and overheating, and improve the fluidity of the plastic melt.
Conventional screw: The screw groove is deeper and the thread spacing is smaller. It is suitable for lower rotational speeds, provides longer melting time, and helps the material to be fully melted and mixed.
Compression ratio:

High Speed ​​Screw: Usually designed with a lower compression ratio to reduce shear heat and pressure accumulation generated during high-speed operation and prevent material degradation or bubble formation. A lower compression ratio also helps stabilize the flow of the plastic melt.
Conventional screw: usually has a higher compression ratio to enhance the compression and exhaust effect of the material, and is suitable for uniform mixing and melting at lower speeds.
Screw length to diameter ratio (L/D ratio):

High Speed ​​Screw: A shorter L/D ratio may be used to reduce the friction resistance and shear force of the screw, which is suitable for high-speed, high-volume operating environments. This design can effectively shorten the time for materials to pass through the screw and improve production efficiency.
Conventional screw: A longer L/D ratio is usually used to ensure that the residence time of the material in the screw is long enough to achieve sufficient melting and uniform mixing.
Cooling and heating design:

High Speed ​​Screw: A more efficient cooling system may be designed during high-speed operation to quickly dissipate heat and prevent overheating. At the same time, the heating system is also more precise to meet the needs of rapid heating and cooling, ensuring the stability of temperature control.
Conventional screw: The cooling and heating design is relatively traditional, suitable for relatively slow heating and cooling processes, and meets the temperature control needs at lower rotational speeds.
Material selection:

High Speed ​​Screw: In order to cope with high wear and high stress under high-speed operation, materials with stronger wear resistance and better fatigue resistance are usually used, such as high-strength alloy steel or special surface treatment materials.
Conventional screw: Generally using standard alloy steel or wear-resistant coating materials, it is suitable for operation and wear at normal speeds.
Cutting area design:

High Speed ​​Screw: The design of the shear zone is more refined to avoid excessive shear force at high speed, ensure the uniformity of the material and reduce possible degradation problems during processing.
Conventional screw: The design of the shearing zone is relatively standardized and adapts to the shearing and mixing needs of conventional speeds.