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Hot Melt Glue Granulation Above Water And Underwater Granulation | JCT Machinery

November 18, 2024
granulation above water equipment            
Working Principle of Granulation Above Water
During the process of granulation above water, the molten hot melt glue is heated to a certain temperature through the extruder, extruded through the nozzle or small hole, and then contacted with cold water, and quickly cooled and solidified into particles. After the particles are cooled, the temperature of the water needs to be controlled within an appropriate range to ensure that hot melt glue can be cooled quickly and evenly.
Working Principle of Underwater Granulation
During the underwater granulation process, the molten hot melt glue is heated by the extruder and then directly injected into the water through a nozzle or a cutting device. The hot melt glue is rapidly solidified under the cooling effect of the water and finally forms granules.
underwater granulation equipment            
Advantages of Granulation Above Water
  • 1. Simple Process

  • The structure of granulation above water equipment is relatively simple and does not require a complex water flow control system.

  • 2. Wide Range of Application

  • Applicable to a variety of hot melt glue, especially those with low melting points, such as hot melt glue, polyolefin hot melt glue, etc.

  • 3. Uniform Particles

  • Through rapid cooling with cold water, particles with smoother and more uniform surfaces can be obtained.

Advantages of Underwater Granulation
  • 1. Suitable for High Viscosity Materials

  • Because underwater granulation can better control the cooling rate and water flow rate, it can handle higher viscosity or melting point glue.

  • 2. Small and Uniform Particles

  • Due to the strong cooling capacity of water, hot melt glue can be solidified in a short time to obtain smaller and more uniform particles.

  • 3. Flexible Particle Shape

  • By changing the water flow, cutting device and cooling parameters, the size and shape of the particles can be controlled.


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