Screw is the main component in the cable and wire extrusion equipment.It’s related to the extruder application range and product efficiency for suit different plastic extrusion need.
There are many kinds of screw..Low smoke halogen free flame retardant cable material contains high fill of magnesium hydroxide and aluminum hydroxide flame retardant agents, so for screw selection generally select special halogen free screw and its compression ratio cannot be too large, generally between 1:1 and 2.5 are more appropriate.
The important factor affect low smoking zero halogen cable basis in extrusion processing,which is extruder cooling device.because the particularity of low smoking no halogen ,because of friction come into heating in extrusion processing,that requires extrusion equipment embody well cooling appliance,can be just control temperature accurately. if the temperature is too high will make the cable surface generate pore,low temperature and can make the current increase , excessive motor load easy to damage the equipment.
At present, China's flame retardant wire and cable products are mainly halogenated flame retardant. When burning, this kind of wire and cable releases a large amount of smoke and corrosive halides, causing casualties and corroding various equipment, namely the so-called "secondary disaster".In order to achieve the purpose of low smoke, low poison and flame retardant, many domestic and foreign manufacturers are devoted to the development of low smoke halogen free and low smoke halogen free flame retardant materials.This kind of material produces less smoke when burning, release poisonous gas less, reduce the harm to human body and instrument equipment