A belt granulator or pastillator is used to transform molten material to lens-like granules (pastilles). The heat of the melt is absorbed by means of Cooling or Chilled Water, based on the melting point of the material.
A granulator consists of the following components: a Rotoform or a Linear Dripper – Metal Conveyor – Cutter – Cooling System – Drive – Heaters – Auxiliary Mechanisms – Electrical and Control Panels
The following figure presents the general components of a belt granulator:
The material of the parts of the rotoform is selected based on the material and temperature of the input melt and standard requirements.
The conveyor belt is often made of special stainless steel resistant to corrosion and fatigue.
The mechanical capacity of the machine depends on the specification of the rotoform and its heat capacity is based on the length of the conveyor.
If the design is right, granules need the shortest length conveyor to reach the separation temperature.
The granulator is generally sensitive to the temperature of the input melt. If the temperature of the feed is not suitably adjustable, a temperature control system is installed before the feeding system.
The conveyor belt can be cooled using cold water or air or a combination of the two. If water is used for cooling, the conveyor needs to have a shorter length.
An important feature of this machine is uniform distribution of melt in the rotoform. Our machines use pressurized four-stage rotoforms to uniformly spray granules on the belt.
The stability of the belt movement on the rollers is also of great importance. Our conveyor belts can operate for hours without any deviation or problems due to employment of correct manufacturing processes in production of the roller and its assembly on the chassis, as well as a smart deviation control system, which is one of the special innovations of our company.
In cases that the melt is sensitive to oxygen contact, the entire belt and rotoform is covered with special covers and the oxygen in the air is kept away from the granules by means of purging nitrogen into the machine.
The internal parts of the rotoform are kept warm by automatic heaters so that the remaining melt can come out of them during down times, preventing blockage in the internal ducts of the rotoform. Another option is the automatic conveyor cleaning mechanism, which is essential for glutinous material