2022.04.21
The polystyrene particles used in the fluidized drying bed for the production of sheets need to be cured before they can be used for sheet forming. The aging can be done by natural aging (curing tank) or fluidized drying bed aging. The structure of the fluidized drying bed is to use a large flow, high-strength fan to form a hot air curtain with a certain strength and temperature through a heat exchanger. Dialysis can quickly set the shape, shorten the curing time, and at the same time, it can also dry and dehydrate the newly foamed polystyrene particles.
The fluidized bed is usually used together with the secondary foaming machine, because the diameter of the polystyrene particles after secondary foaming is large, and the content of the foaming agent in the particles is very small after repeated foaming. After the polystyrene particles discharged from the secondary foaming machine encounter the cold air, the foaming agent quickly changes from a gaseous state to a liquid state, resulting in an excessive pressure difference between the inside and outside of the particles; when the pressure difference is greater than the sustainable pressure of the particles themselves, The particles will shrink. Using a fluidized drying bed to reprocess the particles can prolong the time for the foaming agent to change from gas to liquid, so that hot air can quickly penetrate into the particles, reduce the internal and external pressure difference of the particles, and avoid shrinkage. According to the distance of feeding, the outlet end of the fluidized bed is equipped with a suitable blower. The blower is equipped with a filter screen to prevent the material block from entering the conveying pipeline and causing the pipeline to be blocked. In addition, there are two cleaning ports to regularly clean the polystyrene particles falling through the small holes of the aluminum plate, so as to prevent the influence of the running speed of the polystyrene particles in the fluidized bed and the rotation of the eddy current, which will affect the curing effect. The heat exchanger is a finned radiator made of high-pressure seamless tubes, and the fins are aluminum sheets, which have fast heat transfer and safety. The polystyrene particles automatically roll forward in a vortex shape in the equipment, and are fully dehydrated and dialyzed to achieve a short time setting.
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