Processes for manufacturing an insulating cable sheath by extrusion and crosslinking of a composition based on a silane-grafted polymer

These processes are widely used in the production processes of 1000 Volt copper low voltage cables complies with the standards in force, for example the IEC 502 standard and aluminum and aluminum alloy ABC cables complies with the standards in force, for example the NFC 33-209 standard.

These manufacturing methods consist of mixing and extruding several compounds, namely a thermoplastic base polymer or a mixture of thermoplastic base polymers, silane and a catalyst.  

The mixture is therefore extruded on to the cable to obtain the insulating sheath. This mixture subsequently undergoes crosslinking, namely a bridging between the molecules under the effect of the catalyst, this phenomenon will make the insulating sheath for the 1000 Volt copper low voltage cables and the aluminum and aluminum alloy ABC cables

more mechanically resistant to better protect the cables from the various mechanical stresses during its use such as crushing but also electrical stress such as heating following the passage of current.

Good cross-linking obtained in the presence of a large quantity of water and by heating or also naturally in the open air is therefore very important for this type of cable.

It is known in fact that the physical properties of polymers can be modified by cross-linking the polymer chains. Silane crosslinking, and more generally crosslinking using a crosslinking agent, is a widely used process for crosslinking polymers.

There is a known process for manufacturing cable sheaths from silane-grafted polymer, namely the Sioplas process.

It consists in a first step, generally called “grafting”, in mixing a base polymer, in particular a thermoplastic polymer such as for example a polyolefin, such as polyethylene, with a solution containing the silane

crosslinking agent and a generator of free radicals such as a peroxide. A granule of silane-grafted polymer is thus obtained.

In a second step of this process, generally called “compounding”, this silane-grafted granule is mixed with mineral fillers (in particular a fire-retardant additive), waxes (processing agents) and stabilizers (to prevent aging of the sheath on cable). We then obtain a compound. These two steps are carried out by the material producers who supply the cable producers

This compound is then, in a third extrusion step and more specifically at cable producers, mixed with a dye and a catalyst, in a screw extruder, then extruded onto the conductor.

There is also another process called Monosil process, in this case the cable producer does not need to buy expensive silane-grafted polyethylene, he uses basic polyethylene which costs less and is mixed in the extruder with liquid silane. The cost price of cables insulated with XLPE with this process is lower than that relating to the Sioplas process.

Although many cable producers continue to purchase silane-grafted polyethylene according to the Sioplas method, some producers in their concern to guarantee a lower cost price of cables produced with at the same time an equally good quality of XLPE insulation, choose to use the Monosil process with liquid silane.

In this specific context, LINT TOP CABLE TECHNOLOGY CO., LTD. and more precisely its branch for raw materials ONE WORLD CABLE MATERIALS CO., LTD. ensures the supply of high quality liquid silane for all its customers wishing to work with the Monosil process with our liquid silane.

LINT TOP CABLE TECHNOLOGY CO., LTD. and more precisely its branch for raw materials ONE WORLD CABLE MATERIALS CO., LTD. is the best partner for producers wishing to exploit the advantages of the Monosil method with our liquid silane.

We received during this month of March a large order from a major Tunisian customer for this kind of product and the best is yet to come. LINT TOP CABLE TECHNOLOGY CO., LTD. and more precisely its branch for raw materials ONE WORLD CABLE MATERIALS CO., LTD. encourages the use of the Monosil process with our liquid silane and offers its unwavering technical support to any producer interested in this method.

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