For different plastic properties and equipment requirements for plastic recycling and granulation, we usually have the followingplastic granulation methods.
Water ring pelletizing
The water ring pelletizing system is the most common pelletizing method at present. According to the fluidity of the plastic, it is mainly divided into horizontal water ring and vertical water ring pelletizing.
Among them, the horizontal water ring pelletizer is popular in the market because of its beautiful appearance and convenient operation.
The working principle of water ring pelletizing
After the plastic is heated and plasticized by the screw and exhausted, the impurities in the material are effectively removed through the screen changing process, and the material after the removal of impurities is uniformly discharged through the drainage cone. The die head is equipped with a hole-shaped die, and the number and diameter of the holes are designed according to the pressure so that the material is discharged evenly and the pressure is stable.
The water ring pelletizing system is also equipped with automatic pneumatic pelletizing, and the pelletizing speed is adjusted according to the automatic induction pressure value so that the particles are uniform and full, and the size is uniform.
This is suitable for recycling granulation of plastics such as PE PP HDPE LDPE LLDPE BOPP.
Pulled strips pelletizing
Strand pelletizing means that after the plastic is plasticized and formed, the strip is pulled out after the material is discharged from the die, and then pelletizing after water cooling and drying.
The working principle of the strip pelletizing:
After the plastic is heated and plasticized and the impurities are filtered, it is discharged through the die. The plastic strip is pulled into the water for cooling for the first time. After the water is cooled, it is dried by the fan, and finally cut into particles by a pelletizer.
The advantage of strip pelletizing is that it can be adapted to pelletizing of various plastics, without sticking or jamming, and it is an ideal choice for processing various miscellaneous materials and complex materials.
It is suitable for recycling granulation of plastics such as ABS PC PE PP.
Underwater pelletizing
Underwater pelletizing technology is a "die face eager". Underwater pelletizer, when the uniform high-temperature molten material enters the die flow channel from the end of the upstream equipment, the material is cut into droplets by high temperature. The high-speed rotating pelletizer blade enters the treatment water when the material just leaves the die hole. The droplets solidify and form particles that are close to spheres. This granulation method of "hot cutting first and then water cooling" determines that it can be well adapted to the granulation of materials with poor melt strength, high viscosity, and high heat sensitivity.
It is mainly suitable for the recycling and granulation of PET and other materials.
Which one to choose?
How to choose a pelletizing method mainly depends on the properties of the materials to be processed. A good pelletizing method can save labor, improve work efficiency, and enhance the aesthetics and quality of particles. For more information about pelletizing, please do not hesitate to contact us.
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Published by Retech Marketing & Communications Team
The Retech Marketing & Communications Team publishes official company news, exhibition information, factory updates, project milestones and product announcements.
For technical questions about plastic recycling systems, please contact our engineering team.
