What are the characteristics of plastic-coated composite pipe?
(1) Safety and hygiene: Epoxy resin is a safe and nontoxic resin material. By coating on the inner wall of steel pipe, direct contact between steel pipe and water can be avoided, and it is a very safe and hygienic environmental protection material.
(2) The coating is durable and dense: As a polar material, epoxy resin has a strong bonding ability with steel, which is superior to any other non-polar material (such as polyethylene resin) and will not separate and peel off even if it is used for a long time at high temperature.
(3) Good rigidity and low linear expansion: the plastic-coated composite steel pipe for water supply has the rigidity of steel and low linear expansion coefficient, which is 1/7 of that of ordinary plastic pipe. When installed indoors, it can avoid the damage caused by decoration, and when installed outdoors, it will not expand or bend.
(4) Low flow resistance: the inner wall coated with epoxy resin is very smooth, and there is no scaling in the wall. At the same time, the pipe fittings do not shrink, and the fluid resistance of the pipe network system is small, which can effectively reduce the energy consumption of water supply and improve the water supply at water points.
(5) Strong corrosion resistance: Epoxy resin has strong chemical resistance and strong corrosion resistance to common weak acids and bases.
Production technology of plastic-coated composite pipe;
1, steel strip → welding steel strip into steel tube with high-frequency current → pickling to remove scale and impurities on the surface of steel tube → galvanizing into galvanized steel tube.
2. Polyethylene plastic particles are heated to about 200℃ in a plastic extruder and extruded into plastic pipes by screw pressure; Vacuum sizing; Cooling; Hot-melt adhesive particles are heated to about 200 DEG C in another plastic extruder and extruded into hot-melt adhesive coated plastic pipes by screw pressure; Plastic pipes are cut to a slightly longer length than galvanized steel pipes.
3. Compounding: passing the plastic pipe into the galvanized steel pipe → installing sealing clamps at both ends → heating in a heating furnace with hot air circulation → introducing compressed air into the plastic pipe to expand the plastic pipe → firmly bonding the plastic pipe and the steel pipe with hot melt adhesive under the pressure of compressed air.
Application of plastic-coated composite pipe
In the main fields such as water supply and drainage system, fire sprinkler system, special pipe network system for oil and gas transportation, and cable threading protection pipe system,
It has completely covered all aspects of social production and life and has been applied to so many fields. Let's discuss the analysis of each use of this product in detail. The application of plastic-coated composite steel pipe in water supply and drainage field refers to various forms of circulating water systems, including civil circulating water, industrial circulating water and other water delivery fields. It has excellent performance, low fluid resistance, no breeding of microorganisms, good sanitary performance and great advantages in the field of water supply.
The application of plastic-coated composite pipe in automatic sprinkler system has high temperature resistance, which can solve the corrosion of extinguishing agent and the corrosion and fire resistance in water and water state, which is beyond the reach of ordinary galvanized steel pipe. The application of plastic-coated pipe in fire fighting system improves the value of the system and reduces the comprehensive cost of pipeline maintenance.
Ventilation, water supply and drainage, gas drainage and other aspects in the mine field are also applied to pipelines.
It has good flame retardancy and corrosion resistance, and is also antistatic. It is a cost-effective product in coal mine. We don't know the fields of power cable threading and central cold and hot circulating water, and its cost-effective advantage is the most suitable for application in this field.