CKE(TKD)

所属分类: Mixed component

CKE (TKD) is a modular composite screw mixing element for co-rotating twin-screw extruders. It combines the structural advantages of regular conveying screw elements and kneading blocks, and is considered a low-to-medium shear composite conveying and mixing element. The element uses a block-style spline assembly structure and can be installed directly on the screw core, allowing it to be freely arranged in different process sections of the screw configuration.

Online Consultation

Download

Detailed description

Technical Details of CKE(TKD)

Structural Geometry

Special modified screw profile. The working face of the screw thread adopts meshing relief design. The screw channel maintains the forward conveying flow path while partial shear meshing ridges are arranged. It will not cut off the main material flow and cannot form strong stagnation zones as kneading blocks do. The element is an integral forging piece with an involute spline inner bore, which matches the torque of the shaft, featuring good interchangeability for assembly and disassembly.

Material Configuration

• WR5: Hard phase of vanadium carbide, wear-resistant and impact-resistant, for general compounding applications.

• WR7: High proportion of hard carbides, excellent comprehensive performance of wear and corrosion resistance.

• WR13: Dual performance of wear resistance and corrosion resistance, suitable for battery slurry and corrosive systems.

• Nickel-base alloy: Used for highly corrosive working conditions.

Manufacturing Process

Integral forging and heat treatment, CNC form grinding to guarantee meshing clearance and surface finish to meet self-cleaning requirements. The meshing clearance between elements is controllable to reduce material stagnant dead zones.

Process Parameter Characteristics

• Shear level: Low‑medium shear

• Conveying capacity: Positive forced conveying without reverse backflow

• Shear heat: Remarkably lower than KB kneading blocks; screw operating torque is reduced and overall machine energy consumption drops

• Mixing type: Weak dispersive mixing + moderate distributive mixing

• Material residence: Narrow residence time distribution, less prone to local material accumulation and overheating

Functions of CKE(TKD)

•Forward material conveying: Maintains the capability to push melt forward. It does not block material flow like kneading blocks, ensuring material throughput and output of the whole extruder. It can be used as transition and isolation elements between kneading blocks to dredge flow channels and relieve local pressure build-up.

•Gentle mixing and homogenization: Moderate shear is generated by partial meshing ridges to realize preliminary dispersion and distribution homogenization of fillers, color masterbatches and additives, break up mild agglomerates and complete pre-mixing and transitional homogenization without damaging glass fibers and heat-sensitive polymer chains.

• Low heat generation for process protection: Low shear heat output reduces local temperature rise of melt, avoiding degradation and yellowing of heat-sensitive materials. Suitable for heat-sensitive formulations such as PVC, some biodegradable plastics and long glass fiber modification.

• Reduce screw torque load: Compared with kneading block combinations with equivalent mixing effect, it reduces specific screw torque, lowers equipment load, extends service life of shafts and elements, and realizes compounding production with low energy consumption.

•Transition connection of process sections: Frequently applied at the end of melting zone, melting-homogenizing transition zone, after side feeding and between kneading block groups. It connects front and rear process units, smooths pressure and temperature gradients and optimizes the process curve of the overall screw configuration.