What is a low smoke halogen-free ACSR Cable? As the name suggests: low smoke, that is to reduce the production of harmful objects in combustion; Halogen is a kind of toxic gas for human body, and halogen-free means that there is no release of toxic gas, usually for cables in case of fire.
Low smoke and halogen-free AAC Cable can also be called environmental protection cable. Most of the low smoke and halogen-free cables are used in hospitals and places with strict requirements for environmental sanitation.
The identification of low smoke and halogen-free power cable mainly lies in the identification of insulating materials
1 combustion method
Judge whether the material is easy to burn, whether it is flame retardant wire zrbv or flame retardant power cable zryjv… According to whether it is burning, identify its flame color; Whether smoke is smoke or not, how much smoke is judged, whether it is low smoke halogen-free power cable wdz YJV, and the color of smoke can be distinguished, such as: smoke is clear smoke or soot smoke; Whether there is drop of sol, if there is any, it is necessary to see whether the sol continues to burn; And what kind of smell it produces when burning.
Teflon：
When it is softened and deformed by fire, it has zouqu thin layer, a small amount of coke, micro coke has flavor and non flammability.
PVC：
Green flame light cover, softens white smoke and has hydrochloric acid taste, self extinguishing plastic; Put in the water and sink.
PE：
Blue light cover, the combustion zone is melted transparent, with the smell of glue dropping and candle; put in water and float up.
PP：
Blue light cover, the combustion zone is melted transparent, with the drop of adhesive and kerosene taste; put in water and float up.
PU：
Black smoke, with drop of adhesive, no coke ash, nitrogen and oxygen compound flavor, ductility.
Nylon：
Blue light cover, melting, hair burning, self extinguishing.
Silicone class:
Tasteless, thick white smoke, white residual ash, self extinguishing.
2. Low smoke halogen-free power cable specific gravity method
Density comparison method, that is, based on the density of water, plastic materials are placed in water. If they sink, the density of plastic is larger than that of water. If it floats up, it is smaller than water. This method can be used in conjunction with other methods
The above two kinds of cables are simple to test the flame retardant power cable, flame retardant wire, low smoke halogen-free power cable and low smoke halogen-free wire.
Machine settings for low smoke halogen-free wire and cable
The machine for low smoke halogen-free wire and cable is 55 l dense training; Double wrist feeding with 120 single screw; Hydraulic plate automatic network change; Push pull type counter blower head; The grinding surface is hot for air cooling – the first cyclone separator – the second cyclone separator – the extended air-cooled vibrating screen – the bin; It is necessary to use a compact drill to make m (OA) 3 and EVA of base material more compatible; If only double screw is used, it will be bad to disperse; The advantage of double wrist feeding is that the material is mixed again when feeding; This is very guarantee for the quality of the material; The output of this configuration is about 350 kg / h; Many large factories now adopt this production process.
There is also a machine configuration for low smoke halogen-free wire and cable:
The machine is 55 litre compact drill; Add 65 double screw to the conical double feeder; Automatic change of hydraulic plunger; The air-cooled grinding surface is hot—— The first cyclone separator – the second cyclone separator – the extended air-cooled vibrating screen – the bin; The output of this configuration is about 250 kg per hour.
There is also a configuration of low smoke halogen-free wire and cable: dense drill and cone double feed and double-stage granulation; The price of this equipment is high.