Different plastic pipes are suitable for different industries, such as the process of processing plastic raw materials into tubular products through specific equipment and technology. The type of process varies depending on the material characteristics, pipe specifications and application requirements.
Due to the wide variety of plastic pipes, the processing process can be very tedious, so it is necessary to understand it comprehensively. This article will comprehensively cover everything you need to know about plastic pipe molding.
Plastic pipe molding definition
Plastic pipe molding is the process of processing synthetic resins (such as polyethylene, polyvinyl chloride, polypropylene, etc.) and various additives (such as stabilizers, plasticizers, fillers) into tubular products through physical and chemical changes. This process uses extruders, injection molding machines and other equipment to melt and plasticize the raw materials under high temperature and high pressure, and gives them a specific geometric shape (such as round, corrugated tube shape) through the mold, and then cools, shapes, cuts and other processes to make pipe products with certain strength, corrosion resistance and dimensional accuracy.
Plastic pipe forming process
The manufacture of plastic pipes has become one of the important industries. Due to the advantages of plastic pipes such as light weight, corrosion resistance, and easy processing, they have been widely used in chemical industry, construction, water conservancy, agriculture and other fields.
Raw material selection
The commonly used raw materials for plastic pipes include resins such as polyethylene, polypropylene, polyvinyl chloride, and additives added as needed, such as stabilizers, lubricants, antioxidants, etc. These raw materials need to undergo strict inspection and proportioning to ensure the quality and performance of the product.
Extrusion
Extrusion molding is to heat and melt the raw materials through an extruder, and then form a tube of the desired shape in an extrusion die. An extruder is generally composed of a screw, a barrel, a die, etc. The rotation of the screw pushes the raw materials forward, and heats and melts them through the barrel, and finally forms a tube in the die.
Cooling and shaping
The extruded pipe needs to be cooled and shaped to give it a certain strength and hardness. Cooling and shaping is generally done by water cooling, that is, the extruded pipe is placed in cooling water, and the water flow takes away the heat on the surface of the pipe, so that it can be quickly cooled and shaped.
Traction cutting
Traction cutting generally uses equipment such as traction machines and cutting saws. By adjusting the traction speed and the position of the cutting saw, pipes of different lengths and diameters can be obtained.
Plastic pipe type
HDPE 파이프
HDPE pipe are often used to transport drinking water, replacing cast iron pipes to reduce leakage.
They have excellent corrosion resistance and high impact strength.
Polypropylene (PP) pipes
Polypropylene (PP) pipes have excellent corrosion resistance to acids, alkalis, salt solutions and most organic solvents (such as alcohol and grease). At the same time, they have high rigidity and tensile strength (tensile strength ≥ 29MPa), good impact resistance at room temperature (impact strength is still 25kJ/m² at -5℃), and are suitable for open installation or vibration environments (such as pump room pipes).
PVC pipes
Polypropylene (PP) pipes have excellent corrosion resistance to acids, alkalis, salt solutions and most organic solvents (such as alcohol and grease). At the same time, they have high rigidity and tensile strength (tensile strength ≥ 29MPa), good impact resistance at room temperature (impact strength is still 25kJ/m² at -5℃), and are suitable for open installation or vibration environments (such as pump room pipes).
Plastic pipe applications
Construction Engineering
Plastic pipes are the core materials of water supply and drainage systems. They can be used for indoor and outdoor water supply pipes (such as PP-R pipes, PE pipes), drainage and sewage pipes (such as PVC-U pipes). They have the advantages of corrosion resistance, smooth inner wall, not easy to scale, and easy installation.
Municipal Engineering and Infrastructure
Plastic pipes are responsible for the construction of urban water supply and drainage networks. For example, high-density polyethylene (HDPE) pipes are often used in buried water supply pipes and rainwater and sewage pipes because of their high strength and strong anti-sedimentation ability.
Agriculture and Water Conservancy
Plastic pipes are key components of water-saving irrigation systems. For example, PE pipes and PVC pipes are used in drip irrigation and sprinkler irrigation networks. They are resistant to water pressure, anti-aging, and low in cost, and can effectively improve the utilization rate of water resources. At the same time, they can also be used for farmland drainage and rural drinking water renovation projects, helping agricultural modernization and rural infrastructure construction.
Industrial field
Plastic pipes are suitable for a variety of working conditions according to the characteristics of different materials: acid and alkali resistant PVC pipes and PP pipes can be used for the transportation of corrosive media (such as acid and alkali solutions, industrial wastewater) in chemical companies; high temperature resistant PPH pipes are suitable for thermal pipelines or industrial fluid transportation; wear-resistant HDPE pipes can be used for the transportation of slurry and fly ash in the mining and metallurgical industries to reduce pipeline losses.
Power and Communication Engineering
Cable protection sleeves (such as MPP power pipes and CPVC pipes) have the characteristics of insulation, pressure resistance, and weather resistance. They can be buried underground or constructed without excavation to protect the safety of cables.
결론
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