Analysis of pressure field of template fracture of underwater pelletizer
The granulator is a molding machine that can manufacture materials into specific shapes. It is widely used in chemical, petrochemical, pharmaceutical, food, building materials, mining and metallurgy, environmental protection, printing and dyeing, ceramics, rubber, plastics and other fields.
According to its structure and working principle, it is divided into CF type rotary belt condensing granulator, flat twin-screw extruder, drum drying tablet machine, counter-roll dry granulator (referred to as counter-roll granulator), counter-tooth Granulator, pan vacuum condensing granulator, etc.
From the pelletizer pelletizing system design can be divided into two categories: cold pelletizing system and die surface hot pelletizing system.
The main difference between the two is the time arrangement of the pelletizing process.
The cold pelletizing system cuts the solidified polymer at the end of the process; in the die face hot pelletizing system, when the molten polymer emerges from the die, the pellets are cut, and the pellets are processed downstream cool down.
Overview of underwater pelletizer
Underwater pelletizing equipment is a key equipment in the production of petrochemical and chemical fiber industries.
It is similar to the airflow granulator and the water spray granulator, except that it has a steady stream of water flowing through the mold surface and in direct contact with the mold surface. The size of the pelletizing chamber is such that the pelletizing knife rotates freely over the die surface without restricting the water flow.
The molten polymer is extruded from the die, and the rotating knife cuts the pellets.
The pellets are taken out of the pelletizing chamber by the temperature-regulated water and enter the centrifugal dryer.
In the dryer, the water is drained back to the storage tank, cooled and recycled; the pellets are passed through a centrifugal dryer to remove water.
Underwater pelletizing equipment can be used for polyester, including PET (polyethylene terephthalate), PBT (polybutylene terephthalate), PTT (polytrimethylene terephthalate)
polyamide (PA6) , PA66); PS (polystyrene), including GPPS (universal grade polystyrene), HIPS (high impact polystyrene), ABS (acrylonitrile 2 butadiene 2 styrene copolymer), SAN (acrylonitrile 2 Styrene resin); PMMA (polymethyl methacrylate);PC (polycarbonate) and other underwater pelletizing.
Image 1(Typical system diagram of underwater pelletizer)
Quote-[1] Wang Jian, Liu Wei, Zhang Peng, Zhang Xiaokui. Analysis of the pressure field of the template fracture of the underwater pelletizer[J]. Petroleum and Chemical Equipment, 2012, 000(009): 21-24
