Requirements for silane crosslinked cable compounding

The silane crosslinded cable compounds (also know as sioplas or PEX-B) are now widely used in the wire and cable industry as an insulating material for low-voltage power cables (≤ 10KV). It is two-step reactive extrusion process. Here we introduce the first step, which is to inject silane-peroxide mixture into the melt polyethylene to get a grafted polyethylene. Achieving a high grafting rate depends on the highly distributed dispersion of the compounding system, precise temperature control and residence time of the material in the extruder.

Processing Steps:

Material handling system-Compounding and extrusion- underwater pelletizer -water cooling system and dryer – Classify – Packing system

Xinda Co Kneader

silane crosslinked  cable compounding system

offer several specific benefits

> Gentle shearing:

Co-kneader’s unique combination of screws, pins and barrels can provides low shear which will reduce the breakage to materials’ physical character.

Low process temperature:

The process temperature can be controlled in a narrow zone by precise temperature control of each zone.

Excellent peroxide absorption control:

Liquid peroxide is strictly metered and mixed with pellets separately to assure the best quality of compounds.

> Uniform liquid distribution and dispersion:

Co-kneader’s multiple flights interacted with the pins provides excellent kneading  effect by increasing the mixing circles. Excellent mixing can minimize the use of silane quantity.

> Flexible liquid injection position:

Liquid ingredients can be conducted into melts at designated position which helps customer to achieve the best formula solution.

> Modular design of screws:

Co-kneader’s screw profile can be changed by adjusting the serial of modular designed screw. It makes the compounding system adaptable to all requirements.