PVC Pelletizing Extrusion Line is an industrial equipment production line specially used to process PVC materials into granular products. It converts PVC raw materials into uniform granules through a series of process flows, including raw material conveying, extrusion, cooling, pelletizing, etc. These granules can be used as raw materials for the subsequent production of plastic products. The production line integrates advanced mechanical, electrical and automation control technologies, has efficient, stable and precise production capabilities, and is widely used in the fields of plastic recycling and PVC product manufacturing.

PVC Pelletizing Extrusion Line Features:

Wide range of material adaptability: PVC Pelletizing Extrusion Line is able to process a variety of PVC materials, including recycled PVC, PVC blends, and PVC with different additives. Whether it is hard or soft PVC, the production line can achieve high-quality granulation by adjusting process parameters. This wide adaptability makes it of great value in the field of plastic recycling and reuse, and can effectively process PVC waste from various sources.

Efficient extrusion capacity: The production line is equipped with a powerful extruder with high extrusion efficiency. The main extruder screw diameter is Φ100*P100/90, the length-to-diameter ratio (L/D) is 30, and it is equipped with a 75KW main motor, which can extrude PVC raw materials at a high speed and pressure. It can process 300-350KG of PVC material per hour, meeting the needs of large-scale production, improving production efficiency and reducing unit production costs.

Accurate temperature control: The main extruder adopts 5-point temperature control, and the auxiliary extruder adopts 3-point temperature control. This multi-zone temperature control system can accurately control the temperature at different positions during the extrusion process, ensuring that the PVC material is in the best processing state during the extrusion process. Precise temperature control helps improve product quality stability and reduce product defects caused by temperature fluctuations, such as bubbles, discoloration and other problems.

Dual-stage extrusion design: The production line adopts a dual-stage extrusion process. The main extruder and the auxiliary extruder work together to enable the PVC material to be more fully plasticized and mixed. This design not only improves the plasticization effect, but also allows better exhaust to ensure the quality of the final product. Dual-stage extrusion enables the production line to handle more complex PVC formulas to meet the needs of different customers.

High-quality cooling system: Equipped with a stainless steel cooling water tank (4000360220mm) and a 1.5KW suction motor, it can quickly and effectively cool the extruded PVC strips. The design of the cooling water tank ensures that the strips maintain a uniform cooling speed during the cooling process, avoiding strip deformation or internal stress caused by uneven cooling. A high-quality cooling system is an important part of ensuring product quality, which can give PVC particles good physical properties and appearance quality.

Advanced pelletizing device: The pelletizer is equipped with SKD-11/tungsten steel rotary blades, with a total of 28 blades, driven by a 5.5KW motor and equipped with variable frequency speed regulation. This advanced pelletizing device can accurately control the pelletizing speed and particle size, ensuring that the produced PVC particles are uniform in size and regular in shape. The stability and accuracy of the pelletizer directly affect the quality of the product and the convenience of subsequent processing.

Reliable vibration screening system: The vibration screening machine is equipped with two 90W vibration motors and a 2.2KW blower motor, adopts a three-layer 304# stainless steel structure, and can process 500KG of materials per batch. The system can effectively screen and separate PVC particles of different particle sizes to ensure that the particle size of the final product meets the requirements. The reliable vibration screening system improves the purity and quality stability of the product and reduces the production of unqualified products.

Sturdy and durable construction: The main components of the production line are made of SACM-1 material, and are alloy-coated and electroplated for excellent wear resistance and corrosion resistance. This sturdy and durable construction ensures the stability and reliability of the production line during long-term operation, reduces equipment failure and downtime, and reduces maintenance costs.

PVC Pelletizing Extrusion Line Infomation：

PVC Pelletizing Extrusion Line Advantage:

More Uniform Melting

One of the most critical advantages of the dual-stage extrusion process is its ability to ensure more uniform melting. Unlike traditional single-stage extruders, the dual-stage system operates with a two-step melting approach, ensuring that the material is evenly melted and plasticized. 

Precise Control of Pressure and Temperature

Another standout feature of the dual-stage process is its ability to provide precise control over both pressure and temperature. The Double Stage Recycling Extruder is designed to fine-tune these crucial factors, allowing for adjustments that ensure optimal processing conditions throughout the pelletizing process. Maintaining the correct pressure and temperature is essential for producing pellets that are consistent in size, shape, and overall quality. 

Efficient Degassing

Moisture and trapped gases in the raw material can significantly affect the quality of the finished plastic pellets, leading to defects like bubbles, voids, or weakened structural integrity. The Double Stage Recycling Extruder system effectively addresses this issue with its efficient degassing capabilities.

Production Line Configure:

Working Principle of the PVC Pelletizing Extrusion Line:

First Stage: Initial Melting and Plasticizing

In the first stage, raw materials are introduced into the primary extruder, which can either be a single or twin-screw system. As the screw rotates, it generates mechanical shear and applies external heating to gradually melt the plastic. This thorough melting process results in a uniform, molten plastic mass. The combination of mechanical shear and heat ensures that even materials with varying properties are fully plasticized. During this stage, the molten plastic passes through a filtration system to remove impurities, enhancing the overall quality of the material before it proceeds to the next phase.

Second Stage: Further Melting and Pressure Control

Once the molten plastic exits the primary extruder, it enters the secondary extruder, typically a single-screw system. This stage is focused on refining the melt by reducing its temperature and stabilizing any pressure fluctuations that might affect the quality of the final product. The secondary extruder operates at a slower speed, allowing for precise control over cooling and pressure. This controlled environment ensures consistent plasticizing, which is crucial for producing pellets of uniform quality. Additionally, the secondary extruder is equipped with a degassing system to remove any remaining moisture or volatile compounds, further improving the integrity and durability of the final pellets.

Pelletizing and Cooling

After the plastic has been processed through the second stage, it is extruded through a die to form strands or other shapes, depending on the desired pellet size and design. These extruded strands are then cut into pellets, which are subsequently cooled using air or water. This cooling step solidifies the pellets, stabilizing their shape and ensuring they maintain uniformity. The result is a batch of high-quality plastic granules, ready for use in a variety of applications.

Application of the PVC Pelletizing Extrusion Line:

plastic recycling industry: In the field of plastic recycling, PVC Pelletizing Extrusion Line plays a key role. It can reprocess various recycled PVC materials, such as waste PVC pipes, profiles, films, etc., into high-quality particles. These recycled particles can be used again to produce PVC products, realizing the recycling of resources, reducing dependence on virgin PVC resources, reducing production costs, and also helping to reduce environmental pollution.

PVC product manufacturing: For PVC product manufacturers, this production line is an important equipment for producing PVC particles. Enterprises can produce PVC particles that meet specific requirements by adjusting the process parameters of the production line according to their own product needs. These particles can be used to produce various PVC products, such as PVC wires and cables, PVC pipes, PVC profiles, PVC injection molding parts, etc. The flexibility and efficiency of the production line can meet the needs of large-scale production and customized production of enterprises.

Environmental protection industry: With the continuous improvement of environmental awareness, PVC Pelletizing Extrusion Line is more and more widely used in the environmental protection industry. It can help enterprises recycle and reuse waste PVC materials, reduce waste emissions, and reduce pressure on the environment. At the same time, by producing high-quality recycled PVC particles, it also provides sustainable raw material support for the development of the environmental protection industry and promotes the development of the circular economy.

Construction industry: In the construction field, PVC products such as PVC pipes and profiles are widely used. The PVC particles produced by the PVC Pelletizing Extrusion Line can be used as raw materials for the production of these building materials. By using recycled PVC particles to produce building materials, not only can production costs be reduced, but also the impact on the environment can be reduced, which is in line with the trend of green development in the construction industry.

Electronic and electrical industry: PVC is also widely used in the electronic and electrical industry, such as wire and cable insulation layers, electronic equipment housings, etc. The PVC particles produced by this production line can meet the strict requirements of the electronic and electrical industry for material properties, such as insulation properties, flame retardant properties, etc. By using high-quality PVC particles, electronic and electrical companies can produce safer and more reliable products.

Automobile industry: In automobile manufacturing, PVC materials are often used in the production of interior parts, seals and other parts. The PVC particles produced by the PVC Pelletizing Extrusion Line can provide the automotive industry with raw materials that meet the requirements. As the automotive industry's requirements for environmental protection and lightweighting continue to increase, using recycled PVC particles to produce automotive parts can not only reduce costs, but also reduce the impact on the environment, which is in line with the direction of sustainable development of the automotive industry.

PVC Pelletizing Extrusion Line Maintenance:

Clean the equipment regularly: In order to ensure the normal operation of the PVC Pelletizing Extrusion Line, the equipment needs to be cleaned regularly. The cleaning content includes the screw, barrel, mold, cooling water tank, pelletizer, vibrating screen and other parts of the extruder. Remove PVC residues, dust and impurities on the surface of the equipment to prevent their accumulation from affecting the performance and life of the equipment. Appropriate cleaning tools and detergents should be used during the cleaning process to avoid damage to the equipment.

Check and replace worn parts: Regularly check the various parts of the equipment, especially the easily worn parts such as screws, blades, and screens. If these parts are found to have signs of wear or damage, they should be replaced in time. Worn screws will affect extrusion efficiency and product quality, worn blades will cause uneven pelletizing, and blocked or damaged screens will affect the screening effect of particles. When replacing worn parts, reliable quality accessories should be selected to ensure the normal operation of the equipment.

Lubrication and maintenance: Regularly lubricate and maintain the moving parts of the equipment, such as motors, reducers, bearings, etc. Use appropriate lubricating oil or grease, and add and replace according to the requirements of the equipment manual. Lubrication can reduce friction between parts, reduce wear, and extend the service life of the equipment. It can also improve the operating efficiency of the equipment and reduce energy consumption.

Temperature control system maintenance: The temperature control system is a key part of the PVC Pelletizing Extrusion Line and needs to be maintained and calibrated regularly. Check the accuracy of the temperature sensor to ensure that the temperature display and control accuracy meet the requirements. Clean the heat dissipation components of the temperature control system regularly to ensure that the heat dissipation effect is good and prevent the equipment from overheating or temperature out of control due to a failure of the temperature control system.

Electrical system inspection: Regularly check the electrical system of the equipment, including motors, cables, control panels, etc. Check whether the motor is running normally, whether there is abnormal noise or heating; check whether the cable is damaged, aged, and whether the connection is firm; check whether the various functions of the control panel are normal and whether there is a fault alarm. For electrical problems found, they should be repaired or replaced in time to ensure the safety and reliability of the electrical system.

Cooling system maintenance: The normal operation of the cooling system is crucial to ensure product quality. Regularly check the water quality and water level of the cooling water tank to ensure that the cooling water is clean and sufficient. Clean the debris and dirt in the cooling water tank to prevent it from clogging the cooling pipe. Check the operation of the suction motor to ensure that the air volume is sufficient to take away the heat in time. At the same time, regularly disinfect the cooling system to prevent bacterial growth.

Equipment storage: If the equipment needs to be out of service for a long time, it should be properly stored. Clean the equipment and apply anti-rust oil to prevent the equipment from rusting. Fix the moving parts of the equipment to prevent them from deformation during storage. Store the equipment in a dry and ventilated place to avoid damage to the equipment caused by direct sunlight and humid environment. During storage, the equipment should also be inspected and maintained regularly to ensure that it can operate normally when it is reactivated.

Operator training: Regularly train operators to familiarize them with the operating procedures, maintenance knowledge and common troubleshooting methods of the equipment. Operators should operate strictly in accordance with the operating procedures to avoid equipment damage due to illegal operations. At the same time, operators should also have basic maintenance skills, be able to detect and handle minor equipment faults in a timely manner, and ensure the normal operation of the equipment.

PVC Pelletizing Extrusion Line FAQ?

1. What industries use Double Stage PVC Pelletizing Extrusion Line?

Industries that benefit from these machines include plastic recycling plants, packaging manufacturers, automotive parts production, and companies involved in producing household goods. It is ideal for businesses aiming to reduce plastic waste and promote sustainability.

2. How does a Double Stage PVC Pelletizing Extrusion Line improve plastic recycling?

This machine enhances recycling by offering more thorough processing, filtering, and pelletizing of contaminated plastics. The Two-Stage Plastic Pelletizing Machine degasses and filters impurities, producing high-quality pellets that can be reused in a variety of manufacturing applications.

3. What is the difference between single-stage and Double Stage PVC Pelletizing Extrusion Line?

The primary difference is that the Double Stage PVC Pelletizing Extrusion Line provides an additional step for degassing, filtering, and processing highly contaminated plastics. Single-stage machines are simpler but may not deliver the same quality results for dirty or mixed plastic waste.

4. What are the maintenance requirements for a Double Stage PVC Pelletizing Extrusion Line?

Regular maintenance involves cleaning the extruders, checking the filters, and ensuring the pelletizing blades remain sharp. Proper lubrication and periodic inspection of the heating elements and motors will help maintain efficiency and prevent breakdowns.