Production Process of PVC Pipe Fittings

PVC pipe fittings are widely used in construction, water supply and drainage systems, agricultural irrigation and other fields due to their excellent corrosion resistance, lightness, easy installation and low cost. The production process of PVC pipe fittings involves multiple links, from the selection of raw materials to the molding of the final product, each step requires fine control. The following are the main production processes of PVC pipe fittings

1. Raw material preparation and batching

PVC pipe fittings are produced with PVC resin as the main raw material. Common types of PVC resin are

PVC-U (unplasticized polyvinyl chloride), suitable for general water pipes, drainage pipes and other pipe fittings.

PVC-C (chlorinated polyvinyl chloride), with higher temperature resistance, suitable for hot water pipes.

PVC-O (oriented polyvinyl chloride), with higher strength, suitable for high-pressure pipes.

In addition to PVC resin, stabilizers, plasticizers, antioxidants, fillers and other ingredients need to be added during the production process to improve product performance. The proportion and quality of the ingredients directly affect the physical properties of the final product.

2. Mixing and extrusion

After precise batching, the raw materials will be evenly mixed by a mixer. The mixed raw materials are fed into a twin-screw extruder and heated to a molten state under high temperature and pressure. Through the extrusion die, the PVC material is molded into the preliminary shape of the pipe. During the extrusion process, the screw speed, temperature, pressure and other parameters need to be strictly controlled to ensure the quality of the pipe.

3. Cooling and shaping

The extruded PVC pipe is quickly cooled by a cooling water tank or air cooling system. This process requires controlling the cooling rate to avoid warping, deformation and other problems in the pipe. After cooling, the size and shape of the pipe have been roughly formed.

4. Cutting and trimming

According to customer requirements, the cooled pipe will be cut to length by a cutting machine to ensure that each pipe is of the same length. For large-diameter pipes or pipes with complex shapes, trimming may be required to remove excess burrs and irregular parts to ensure a smooth surface.

5. Quality inspection and acceptance

After the pipe is produced, it will undergo a series of strict quality inspections. These inspections include:

Dimension inspection: Ensure that the outer diameter, inner diameter, wall thickness, etc. of the pipe meet the standards.

Pressure test: Test the pressure that the pipe can withstand to ensure that it meets the requirements of use.

Impact test: Test the impact resistance of the pipe, especially in low temperature environment.

Corrosion test: Check the corrosion resistance of the pipe in different chemical environments.

Qualified pipes will enter the packaging stage and be ready for shipment.

6. Packaging and transportation

After quality inspection, the pipes will be packaged according to customer needs, usually using plastic film, cartons, wooden boxes and other materials. The packaging not only needs to protect the surface of the pipe from damage, but also needs to ensure stability during transportation.

Application of PVC pipe fittings in construction and water supply and drainage systems

PVC pipe fittings have become an indispensable part of construction and water supply and drainage systems due to their cost-effectiveness, easy installation and corrosion resistance. The following are the applications of PVC pipe fittings in these two fields

1. Application in construction

In the construction industry, PVC pipe fittings are mainly used for water pipes, drain pipes, sewage pipes and ventilation pipe systems, especially in residential, commercial buildings and industrial buildings.

Water supply pipe system: PVC pipes have good water pressure resistance and corrosion resistance, and are often used in pipes that provide drinking water. Especially in tap water pipe networks and building water supply systems, the use of PVC pipe fittings can effectively avoid water pollution and reduce maintenance costs.

Drainage and sewage systems: The corrosion resistance and chemical stability of PVC pipes make it an ideal drainage pipe material. It is suitable for indoor and outdoor drainage systems, especially in sewage pipe systems. PVC pipe fittings can effectively resist corrosion from chemicals, grease, acid and alkali, and extend the service life of the pipe.

Ventilation system: PVC pipe fittings are often used in the ventilation system of buildings, especially in environments where air circulation needs to be maintained and pollutants need to be avoided. The smooth inner wall of PVC pipes can reduce air resistance and improve ventilation efficiency.

2. Application in water supply and drainage systems

PVC pipe fittings play a vital role in water supply and drainage systems, especially in urban and industrial fields.

Rainwater drainage system: PVC pipe fittings are widely used in rainwater drainage systems, which can quickly and efficiently guide rainwater into sewers to prevent urban waterlogging and flooding. The high strength and corrosion resistance of PVC make it very reliable in long-term use.

Industrial wastewater discharge: In some industrial wastewater discharge systems, PVC pipes have become the preferred material due to their corrosion resistance and chemical resistance. Especially in the petrochemical and chemical industries, PVC pipes can withstand highly corrosive chemicals.

Irrigation system: PVC pipe fittings are also widely used in agricultural irrigation systems. It is an ideal material for agricultural irrigation and water resource management due to its strong weather resistance, convenient transportation and simple installation. PVC pipe fittings can be used in drip irrigation, sprinkler irrigation, pipe water supply and other systems.

3. Advantages of PVC pipe fittings

Economical: PVC pipe fittings have relatively low production costs, and have good cost performance due to their long service life and low maintenance costs.

Corrosion resistance: PVC pipe fittings can withstand corrosion from most chemicals and are particularly suitable for conveying sewage, chemical liquids, etc.

Easy installation: PVC pipe fittings have simple connection methods, usually using gluing or plug-in methods, which are fast to install and save manpower and time costs.

Light weight: The weight of PVC pipe fittings is much lower than that of metal pipe fittings, reducing the burden of transportation and installation.

PVC pipe fittings are widely used in construction and water supply and drainage systems. The production process has strict standards from the selection of raw materials to the inspection of finished products, ensuring the quality and service life of the pipe fittings. With the advancement of technology, the performance of PVC pipe fittings in various application fields has been continuously improved, and its position in the construction industry and water supply and drainage systems will continue to be consolidated and improved.