What is the low smoke zero halogen power cable? As the name suggests, low smoke reduces the production of harmful objects during combustion; halogen is a toxic gas for the human body; halogen-free is the release of no toxic gas, usually for the cable in case of fire. low smoke zero halogen power cables can also be called environmental protection cables. low smoke zero halogen cables are mostly used in hospitals and places with strict environmental health requirements.

Identification of low smoke zero halogen power cables

1. Combustion method

Judging conditions:

According to whether the material is easy to burn, distinguish its flame color and determine whether it is a flame retardant wire (ZRBV) or flame retardant power cable (ZRYJV). According to whether it is smoking, the amount of smoke to determine whether it is low smoke zero halogen power cable (WDZ-YJV); if smoke, distinguish the color of the smoke, whether it is clear smoke or smoke containing charcoal ash; see if there is dripping; if there is, determine whether to continue to burn and what odor is produced when burning.

The following are several insulator material characteristics:

Teflon:

In the event of fire, it is softened and deformed, with a thin layer of zou curvature, a small amount of coke, micro-coke smell, and non-flammability.

PVC:

Green flame cover, softened white smoke and taste of hydrochloric acid, self-extinguishing plastic; Put in water, sink.

PE:

Blue light cover, melting and transparent burning zone, with melting glue dripping and candle smell; Put in the water and rise.

PP:

Blue light cover, melting and transparent burning zone, with melting glue dripping and kerosene smell; Put in the water and rise.

PU:

Black smoke, dripping glue, no burnt ash, nitrogen oxide smell, burning ability.

Nylon:

Blue light mask, melting, burnt hair, self-extinguishing.

Silicone:

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, the plastic material is placed in water, if it sinks, the plastic density is larger than water, and if it floats, it is smaller than water. This method can be used in combination with other methods.

The above two types can be used to simply test flame retardant power cables, flame retardant wires, low smoke halogen-free power cables, low smoke halogen-free wires.

Machine setup for low smoke halogen-free wire and cable

Machine configuration 1:

Low smoke halogen-free cable machine is dense training (55 liters), double wrist feeding plus 120 single screws, hydraulic plate automatic net change, push and pull type blow head; Grinding surface air-cooled heat; first cyclone separator; second cyclone separator; extended air-cooled vibrating screen; silo. It is necessary to use the compaction machine to make M(OA)3 and the base material EVA better compatible together; if only the twin screws are used, it will appear to have a to have a bad dispersion problem. The advantage of double-wrist feeding is that the material is mixed again when it is fed, which guarantees the quality of the material, and the output of this configuration is about 350 kilograms per hour, so many manufacturers now use this production process.

Machine Configuration 2:

The machine is a 55-liter compaction machine with a cone double feeder plus 65 twin screws, hydraulic plunger automatic net change, an air-cooled grinding surface, the first cyclone separator, the second cyclone separator, an extended air-cooled vibrating screen, and a silo. The output of this configuration is probably around 250 kg per hour.

Machine configuration 3:

Dense and cone double feeding and double stage granulation, but this equipment is relatively high price.

Low smoke halogen-free wire and cable price:

The price of low smoke zero halogen wire and cable is about 10%–20% higher than that of ordinary cable. The main reasons are: first, raw materials are more expensive than ordinary wire and cable; second, in the production machine setting, the production time of low-smoke zero-halogen wire and cable is about 30%–50% more than that of normal wire and cable; and third, the efficiency is relatively low. The combination leads to an increase in its cost.