Co-rotating Twin Screw Underwater Pelletizing Compounding Line

CK-HT series Co-rotating Twin Screw Underwater Pelletizing Compounding Extrusion Line is designed especially for compounding materials with high viscosity, low MI, or difficulty to be shaped. The extrusion line can be applied to a wide range of materials and applications.

Possible materials:
TPU, TPE, TPV, TPR, PP, PS, PLA, PVA, SEBS, EVA, Rubber, Hot-melt adhesive, Special resin, and Micro pellet, etc.

How it works :
①Hopper ➜ ②Loss-in-weight feeder ➜ ③Side feeder ➜ ④Extruder ➜ ⑤Underwater pelletizing system ➜ ⑥Centrifugal dryer ➜ ⑦Vibrating screening unit ➜ ⑧Storage tank

The raw materials are fed into hopper and then enter into plastic extruder via loss-in-weight feeder. The additives are fed into extruder by side feeder. The materials are melted, kneaded, and extruded by plastic extruder. The extruded melts are cut into pellets by underwater pelletizing machine. Since the cutting chamber is completely filled with process water, the melts are immersed in water as they come out from the die holes. The pellets are cooled and transported by water to downstream drying and screening units to become finished pellets.

• Loss-in-weight feeder
  

  Loss-in-weight feeder is a gravimetric metering device that provides upstream materials a stable, even, and accurate feeding to plastic extrusion machine. The feeder receives constant feedback from weighing device to ensure that each batch of materials are delivered in precise amount.
  
  CYKF provides different types of loss-in-weight feeders, including single screw, twin screw, and models for liquids. Various sizes and configurations are available to satisfy wide applications.



• Side feeder
  

  The side feeder has self-cleaning function, it can stabilize process of material feeding.



• Extruder screw
  

  The screw zones of conveying, melting, mixing, compressing, venting, and vacuum are designed according to customers’ material formulations. From steel selection, machining accuracy to quality management, we have strict standard procedures to make sure the good quality and lifetime of these key components.



• Die
  

  The die material and mold runner must be selected and designed according to the physical properties and characteristics of plastics to avoid occurrences of uneven material flow rate, retention, excessive molding pressure, in-mold temperature increase, decomposition and carbonization or other situations that may damage material properties of plastics. The die is equipped with pressure gauge to monitor production conditions.



• Underwater pelletizing system
  

  The die face of extruder is immersed in water. The plastic pelletizer with special rotating knives cut melts into even pellet immediately as they exit from the die holes. These pellets are being cooled and transported by water to downstream equipment. It is quiet and durable, it can not only be applied to most plastics, but also in different applications, e.g., compounding and coloring.



• Centrifugal  dryer
  

  The equipment belongs to the downstream process of underwater pelletizing system. It is to remove surface moisture on the cooled plastic pellets. By eliminating the moisture, a better quality of the pellets can be obtained.



• Vibrating screening unit
  

  The machine body is made by stainless steel, it can filter out different sizes of pellets and also remove dust on pellet surfaces.



• Storage tank
  

  The storage tank is the important device of the extrusion systems. It is made by stainless steel and has different capacities for choice. Big bag filling machine or bagging machine are also available on requirements.