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PVC - O pipes have a wide range of applications in various industries due to their excellent properties such as high strength, good chemical resistance, and low friction coefficient.
The main production processes of PVC - O pipes include the following steps:
Raw material preparation: The primary raw material for PVC - O pipes is polyvinyl chloride (PVC) resin. Additives such as stabilizers, lubricants, and modifiers are also mixed in appropriate proportions to improve the performance of the PVC - O pipes. These additives help to enhance the heat resistance, mechanical strength, and processing properties of the material.
Extrusion: The prepared raw materials are fed into an extruder. Inside the extruder, the materials are heated and melted under high pressure. The screw in the extruder rotates to push the molten material forward and continuously extrude it through a die in the shape of a pipe. The die determines the outer diameter and wall thickness of the pipe. During extrusion, the temperature and pressure are strictly controlled to ensure the uniform quality of the extruded pipe.
Orientation: The orientation process is a key step in the production of PVC - O pipes. There are mainly two methods: axial orientation and biaxial orientation. Axial orientation is usually achieved by stretching the extruded pipe in the axial direction using a stretching device. Biaxial orientation combines axial stretching with radial expansion, which can be carried out through internal pressure or mechanical expansion. The orientation process aligns the polymer chains in the PVC material, thereby improving the tensile strength, impact resistance, and pressure - bearing capacity of the pipe.
Cooling and shaping: After orientation, the pipe is cooled rapidly to fix its shape. This is usually done by passing the pipe through a water - cooling tank or using air - cooling methods. The cooling rate affects the final properties of the pipe, so it needs to be precisely controlled. During the cooling process, the pipe shrinks slightly, and its dimensions and shape are further stabilized.
Cutting: The cooled pipe is cut into the required lengths using cutting equipment. The cutting can be done by sawing, shearing, or using laser - cutting techniques, depending on the pipe diameter and the required cutting accuracy. The cut ends of the pipe should be smooth and free of burrs to ensure good connection and sealing performance.
Surface treatment and quality inspection: The surface of the PVC - O pipe may be treated to improve its appearance and surface properties. This can include processes such as polishing or coating. Then, a series of quality inspections are carried out, including visual inspection for surface defects, dimensional measurement to ensure the pipe meets the specified standards, and mechanical property tests such as tensile strength and pressure resistance tests. Only the pipes that pass the quality inspection are considered qualified products and can be packaged and shipped for use.
Packaging: The qualified PVC - O pipes are packaged according to customer requirements and transportation needs. Usually, they are wrapped with plastic films or placed in packaging boxes to prevent damage during transportation and storage.
PVC - O pipes have a wide range of applications in various industries due to their excellent properties such as high strength, good chemical resistance, and low friction coefficient.
The main production processes of PVC - O pipes include the following steps:
Raw material preparation: The primary raw material for PVC - O pipes is polyvinyl chloride (PVC) resin. Additives such as stabilizers, lubricants, and modifiers are also mixed in appropriate proportions to improve the performance of the PVC - O pipes. These additives help to enhance the heat resistance, mechanical strength, and processing properties of the material.
Extrusion: The prepared raw materials are fed into an extruder. Inside the extruder, the materials are heated and melted under high pressure. The screw in the extruder rotates to push the molten material forward and continuously extrude it through a die in the shape of a pipe. The die determines the outer diameter and wall thickness of the pipe. During extrusion, the temperature and pressure are strictly controlled to ensure the uniform quality of the extruded pipe.
Orientation: The orientation process is a key step in the production of PVC - O pipes. There are mainly two methods: axial orientation and biaxial orientation. Axial orientation is usually achieved by stretching the extruded pipe in the axial direction using a stretching device. Biaxial orientation combines axial stretching with radial expansion, which can be carried out through internal pressure or mechanical expansion. The orientation process aligns the polymer chains in the PVC material, thereby improving the tensile strength, impact resistance, and pressure - bearing capacity of the pipe.
Cooling and shaping: After orientation, the pipe is cooled rapidly to fix its shape. This is usually done by passing the pipe through a water - cooling tank or using air - cooling methods. The cooling rate affects the final properties of the pipe, so it needs to be precisely controlled. During the cooling process, the pipe shrinks slightly, and its dimensions and shape are further stabilized.
Cutting: The cooled pipe is cut into the required lengths using cutting equipment. The cutting can be done by sawing, shearing, or using laser - cutting techniques, depending on the pipe diameter and the required cutting accuracy. The cut ends of the pipe should be smooth and free of burrs to ensure good connection and sealing performance.
Surface treatment and quality inspection: The surface of the PVC - O pipe may be treated to improve its appearance and surface properties. This can include processes such as polishing or coating. Then, a series of quality inspections are carried out, including visual inspection for surface defects, dimensional measurement to ensure the pipe meets the specified standards, and mechanical property tests such as tensile strength and pressure resistance tests. Only the pipes that pass the quality inspection are considered qualified products and can be packaged and shipped for use.
Packaging: The qualified PVC - O pipes are packaged according to customer requirements and transportation needs. Usually, they are wrapped with plastic films or placed in packaging boxes to prevent damage during transportation and storage.
