How To Control Part Of Twin Screw Extruder Granulation Through Manual Operation
In the booming development of plastic recycling and regeneration, twin screw extruders, as the core equipment, are playing an increasingly important role. Especially against the backdrop of increasingly stringent global environmental policies and the goal of carbon neutrality, the demand for biodegradable plastics in the market is growing rapidly.
As an operator, have you ever considered the importance of manual operation in the granulation process of twin screw extruders? A small mistake may result in the entire batch of materials being scrapped; A subtle operational optimization can significantly improve product quality and production efficiency.
1, Safety prevention: the first priority of manual operation
Wearing protective gear is a fundamental guarantee for safe operation. According to the latest "General Safety Requirements for Rubber and Plastic Machinery" (GB46035-2025) released in August 2025, operators must wear protective equipment such as goggles, gloves, and work clothes.
In the view of Nanjing Kelongweier Chemical Machinery Co., Ltd., safety is not only a regulation, but also a corporate culture. We suggest that before operating the twin screw extruder, it is necessary to check whether the electrical wiring is accurate, whether there is any looseness, and confirm whether the foundation bolts of the entire unit are tightened. These seemingly simple steps are the key to ensuring the safe operation of the plastic granulator.
2, Operation Specification: The Art of Precise Control
The preparation for starting the twin screw extruder is a prerequisite for ensuring normal operation. The operator needs to set the parameters of the temperature control instruments in each heating zone according to the process requirements. After the heating temperature of each section reaches the set value, continue to maintain the insulation for 30 minutes. This is because the plastic extrusion process is extremely sensitive to temperature, and uneven temperature can directly affect the plasticizing effect.
The engineering team of Nanjing Kolongweier Chemical Machinery Co., Ltd. pointed out that during the granulation process of the twin screw extruder, it must first idle without adding any materials, with a speed not exceeding 20r/min and a time not exceeding 1 minute. This step is often overlooked, but it has a significant impact on the lifespan of the equipment.
Feeding operation is the core link in the operation of twin screw extruders. The feeding should be started at the lowest possible speed and the feeder should be matched with the main engine speed. This requires operators to have rich experience and keen observation skills to ensure the normal operation of the host and main feeding system.
3, Shutdown and Maintenance: Wisdom for Extending Equipment Lifespan
The normal parking sequence is the key to ensuring the long-term stable operation of the twin screw extruder: stop the feeder → close the vacuum pipeline valve → open the vacuum chamber cover → gradually reduce the main screw speed → shut down auxiliary equipment such as the granulator → turn off the motor, oil pump, and external inlet pipe valves.
Nanjing Kelongweier Chemical Machinery Co., Ltd. suggests that the mold head must be cleaned after each operation to prevent blockage caused by mold head cooling. It is particularly important to note that after each shift's operation is stopped, the discharge holes of the mold head and the filter plate must be completely cleaned before reinstalling for production, otherwise there is a risk of explosion due to blockage of the mold head.
Regular maintenance is an important measure to ensure the performance of twin screw extruders. If the main motor is a DC motor, the motor carbon brush should be checked once a month; The electrical control cabinet should be purged once a month; Check the wear of screws and barrels every quarter; Inspect the gears, bearings, and oil seals of the gearbox once a year.
4, Environmental Protection and Innovation: Future oriented Granulation Technology
With the continuous improvement of environmental protection requirements, the application of twin-screw extruders in the processing of biodegradable materials is becoming increasingly widespread. The latest research shows that by combining thermoplastic starch (TPS) with other biodegradable materials, high-performance biodegradable plastic granulation products can be produced.
Nanjing Kelongweier Chemical Machinery Co., Ltd. has been committed to the research and manufacturing of environmentally friendly twin-screw extruders. Our equipment can process various bio based materials, including biodegradable materials such as PLA, PBAT, and PBS, providing customers with cost-effective solutions.
The global twin-screw extruder market is steadily growing in size, and it is predicted that the global twin-screw extruder market will continue to maintain a growth trend from 2025 to 2031. This trend has brought broad development prospects for enterprises and individuals engaged in plastic extrusion granulation.
The manual operation in the granulation process of twin-screw extruder is a work that combines technology, experience, and art. The grasp of every detail directly affects the quality and production efficiency of the final product.
In today's increasingly important environment of environmentally friendly materials, mastering the correct operation method of twin-screw extruders can not only improve production efficiency and product quality, but also make positive contributions to environmental protection, achieving a win-win situation of economic and ecological benefits.
Nanjing Kelongweier Chemical Machinery Co., Ltd. is willing to work together with you to promote the progress and development of plastic granulation technology, and contribute to creating a green and sustainable future.The value of technology lies in its application, the charm of art lies in its grasp, and the secret to success lies in the details.
