Global Supplier & Manufacturer
| Model | Extruder model | Motor power (kw) | Capacity(kg/h) | Cooling stage |
| PZL-51 | SJSZ51 | 18 | 90 | 1 |
| PZL-55 | SJSZ55 | 22 | 125 | 2 |
| PZL-65 | SJSZ65 | 37 | 200 | 3 |
| PZL-80 | SJSZ80 | 55 | 400 | 3 |
| PZL-92 | SJSZ92 | 110 | 600 | 3 |
1. High-Efficiency Extrusion System
The machine employs a specially designed screw and barrel structure to ensure:
Stable plasticizing performance
Uniform material melting
Higher extrusion output
Lower energy consumption
Optimized extrusion process improves pellet quality and production efficiency.
2. Advanced Temperature Control System
The intelligent temperature control system enables precise heating and cooling management during processing.
Advantages include:
Stable processing temperature
Reduced material degradation
Improved pellet consistency
Extended equipment lifespan
3. Uniform PVC Granulation System
The granulation unit is designed to produce PVC pellets with uniform size and smooth surface.
Supports:
Hot die granulation
Water-cooled granulation
Strip granulation (optional)
The final PVC pellets can be used directly for extrusion or injection molding production.
4. Energy-Saving and Durable Design
The PVC granulator uses high-quality components and optimized mechanical design to ensure:
Long service life
Low maintenance requirements
Stable continuous production
Low operating costs
Raw Material Preparation
PVC resin, plasticizer, stabilizer, and filler are uniformly mixed in a specific ratio to create a mixture that meets production requirements. For example, when producing soft PVC granules, the amount of plasticizer added is relatively large; while when producing rigid PVC granules, the amount of plasticizer added is reduced, and the proportion of stabilizer and filler is increased.
Feeding
The mixture is added to the hopper of the PVC granulator via an automatic feeder or manually. An automatic feeder improves feeding efficiency and ensures continuous and stable feeding.
Plasticizing Extrusion
After entering the barrel, the mixture in the hopper gradually heats up, softens, melts, and plasticizes under the combined action of shear force, friction, and external heating generated by the screw rotation. Different parts of the screw have different functions; for example, the feeding section transports the material, the compression section compresses and initially plasticizes the material, and the metering section ensures uniform and stable extrusion. The molten PVC material is pushed by the screw to the die head.
Cooling and Molding
The PVC material extruded from the die is in strip form and is cooled and shaped using either air cooling or water cooling. Air cooling uses cold air blown by a fan to cool the material, while water cooling uses a water tank. Water cooling is faster, but the cooling water temperature needs to be controlled to prevent surface defects.
Granulation
The cooled PVC strips enter a granulator, where a rotary cutter cuts them into granules of a certain length. There are two granulation methods: hot cutting and cold cutting. Hot cutting refers to cutting before the material has completely cooled after extrusion and is suitable for soft PVC; cold cutting refers to cutting after the material has completely cooled and is typically used for rigid PVC.
Screening and Packaging
The cut PVC granules are screened by a vibrating screen. Granules that do not meet the size requirements are separated and returned for further processing. Qualified granules are packaged by a packaging machine for storage and transportation.
This PVC granulator’s Standard Operating Procedure (SOP) is clearly structured, covering the following key stages: preparation, operation, and shutdown/maintenance.
For ease of understanding by operators, the following is a simplified and standardized version applicable to daily production:
PVC Granulation Production Line Standard Operating Procedure (SOP)
1. Pre-operation Inspection (Before Start-up)
Equipment Inspection: Confirm all components are in good condition. Check the screw and barrel for wear, ensure the drive, heating, cooling, and control systems are functioning correctly, and confirm all mechanical connections are secure.
Cleaning: Thoroughly clean the barrel and screw, removing all debris or residue to prevent contamination of new batches and ensure product quality.
Material Preparation: Accurately weigh and mix raw materials according to the formulation guide. Inspect the raw materials to ensure they are free of impurities and excessive moisture.
2. Start-up and Production Operation
Preheating: Gradually heat the barrel according to the target temperature profile. After reaching the set temperature, maintain the specified holding time to ensure uniform plasticization and protect the equipment from thermal stress.
Start-up Sequence:
1. Start the screw at low speed.
2. Feed a small amount of raw material into the hopper.
3. After the material is successfully extruded, gradually increase the screw speed and feed rate until normal production parameters are reached.
Parameter Monitoring: Continuously monitor process parameters, including zone temperature, melt pressure, and screw speed. If pressure spikes or fluctuations occur due to changes in raw materials, adjust the feed rate, screw speed, or formulation accordingly.
Feed Stability: Maintain a stable and continuous material feed. Strictly prevent foreign objects (especially metal objects) from entering the hopper, as this can severely damage the screw and barrel.
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3. Post-Production Maintenance
Cleaning: Extrude all remaining material in the barrel. Clean the screw and barrel using a suitable cleaning agent or shutdown cleaner to prevent resin degradation during downtime.
System Shutdown: Shut down the heating zone, main drive motor, cooling water lines, and compressed air system. Perform routine maintenance, such as lubricating drive components.
Safety Procedures:
Interlocks and Protective Devices: Keep all safety doors and devices closed during operation. Never bring hands or tools near moving parts while the machine is running.
Daily Inspections: Periodically test the emergency stop button and safety interlocks to ensure they are functioning properly.
The SJ Series Rigid Plastic Single Screw Pelletizing Line is suitable for PP, PE, ABS, PC, PS flakes and scraps pelletizing. The extruder uses the high efficiency screw barrel to ensure the plasticizing effect and high output of the finished product. The forced vacuum exhaust system effectively removes low molecular impurities, moisture and ink. According to the contamination of material and customers’ habits, the variety of screen changers are available: plate screen changer, column screen changer and automatic screen changer. For different purposes, the variety of screw L/D ratio, two stage extrusion system and pelletizing method are available.
PVC granulating machine line is the core equipment for recycling and processing of polyvinyl chloride (PVC) plastics. It converts PVC resin, additives and recycled waste into reusable granular raw materials through physical processing and is widely used in various links of the plastic industry chain.
Zhangjiagang Sharc Machine Co., Ltd. is a professional company with outstanding achievements in the field of plastic machinery.
Since its establishment, we have been committed to the research and development, production and sales of plastic machinery.We have an experienced and innovative R&D team who keep up with the cutting-edge trends of international plastic processing technology and continue to study to ensure that our equipment remains technologically advanced.
Over the years, we have accumulated rich experience and a good reputation in the plastic machinery industry. Whether it is a large-scale
plastic processing enterprise or a small and medium-sized manufacturer, we have won their trust and long-term cooperation with high-quality
products and services. We will continue to uphold the concept of professionalism, innovation and service, contribute our own strength to
the development of the plastic machinery industry, and work hand in hand with customers to create brilliance together.
We have more than 20 years’ experience of manufacturing plastic machinery, including: automatic material mixing&feeding system, plastic profiles extrusion line, plastic sheet production line, plastic pipe production line, plastic panel&board extrusion line, plastic recycling&pelletizing machine, surface treatment machines and other auxiliary machines.
