Low smoke halogen-free flame retardant cable model, cable material, implementation standard detailed interpretation
What is a low smoke halogen-free cable? As the name suggests: low smoke, that is, reduce the production of harmful substances when burning; Halogens are toxic gases to the human body, and halogen-free means that there is no release of toxic gases, usually in case of a fire on a cable. The low-smoke halogen-free power cable can also be called environmental protection cable. The low-smoke halogen-free power cable is mostly used in hospitals and places with strict environmental hygiene requirements.
Low smoke halogen-free flame retardant cable model
The +WDZ cable before the cable type code is a low-smoke halogen-free flame retardant cable, such as WDZ-YJV; The flame retardant ZR class is divided into three levels (A, B, C). For example, the full name of wDZA-YJV is A class A flame retardant low smoke halogen-free flame retardant copper core crosslinked insulated power cable.
Low smoke halogen-free flame retardant cable implementation standard
The cable is manufactured in accordance with GB/T 12706-2002 or IEC 60502 or other standards required by the customer. According to GB/T18380.3-2001 standard, the flame retardant property is divided into A, B, C three different flame retardant categories, class A has the best flame retardant performance.
Identification of low smoke halogen-free flame retardant cable materials
1. Burning method
Determine whether the material is flame retardant wire -ZRBV or flame retardant power cable -ZRYJV... Distinguish its flame color according to whether it burns; If there is smoke, tell the color of smoke, such as: smoke is pure smoke or smoke containing charcoal ash; Whether there is sol dripping, if there is to see whether the sol continues to burn; And what kind of smell it produces when it burns.
Teflon: softened and deformed by fire, with a thin layer of zigzag, a small amount of coke, slightly burnt flavor, and incombustibles.
PVC: green flame mask, softening white smoke and hydrochloric acid taste, self-extinguishing plastic; Drop into the water and sink.
PE: blue light cover, transparent melting in burning area, glue dripping and candle smell; placed in water, floating.
PP: blue light cover, transparent melting in combustion zone, with glue dripping and kerosene smell; placed in water, floating.
PU: black smoke, molten glue dropping, no coke ash, nitrogen oxide taste, long burning property.
Nylon: Blue hood, melt, dark hair odor, self-extinguishing.
Silicone: tasteless, thick white smoke, white residual ash, self-extinguishing.
2. Specific gravity method of low-smoke halogen-free power cable
Density comparison method, that is, based on the density of water, plastic material placed in water, if the sink, plastic density than water, if floating, less than water. This method can be used in conjunction with other methods
Above two kinds, simple test flame retardant power cable, flame retardant wire, low smoke halogen-free power cable, low smoke halogen-free wire.
Low smoke halogen-free flame retardant cable production equipment
The machine used for low smoke halogen-free wire and cable is compact 55 litres; Double wrist feed with 120 single screw; Hydraulic plate-type automatic net changing; Push-pull type blower head; Grinding surface air cooling hot - the first cyclone separator - the second cyclone separator - extended air cooled vibrating screen - bin; It is necessary to use the dense training machine to make M(OA)3 and EVA better compatible together; If only twin-screw to do it will appear poor dispersion; The advantage of feeding with two arms is that the material is mixed again when it is fed; It guarantees the quality of the material; The output of this configuration is about 350 kilograms per hour; Many big factories have adopted this production process now.
There is also a production machine configuration for low-smoke halogen-free wire and cable: the machine is a 55-liter denser; Cone double feeder with 65 twin screw; Hydraulic plunger automatic net change; Air cooled ground noodles are hot; -- The first cyclone separator -- the second cyclone separator -- extended air-cooled vibrating screen -- stock bin; This configuration yields around 250 kilograms per hour. There is another configuration for low smoke halogen-free wire and cable: taper double feeding and double step granulation; This kind of equipment is expensive.
Low smoke halogen-free flame retardant cable application
Suitable for places with rated voltage of 450/750V and below, no halogen, low smoke, flame retardant and high safety and environmental requirements. Such as high-rise buildings, stations, subways, airports, hospitals, large libraries, gymnasiums, villas, family homes, hotels, hospitals, office buildings, schools, shopping malls and other crowded places.
Low smoke halogen-free flame retardant cable price
The price of low-smoke halogen-free wires and cables is 10% to 20% higher than that of ordinary cables. The main reasons are as follows: first, the raw materials are more expensive than ordinary wires and cables; In addition, in the setting of production machines, the production time of low-smoke halogen-free wire and cable is about 30%-50% more than that of normal wire and cable, which is relatively low in efficiency and leads to the increase in cost.