Application of loss in weight Feeder in Plastic Modification Operation
In the processing of special plastics materials, it is often necessary to mix synthetic resins with necessary accessories (such as mineral powder, glass fiber) and additives (such as plasticizers, flame retardants, antioxidants, nucleating agents, etc.) according to a certain proportion to enter the blending extruder. This process of mixing according to formula is called plastic blending. Plastic blending dates back to the birth of celluloid in 1870. Since then, with the development of modification technologies such as plastics coloring, blending, filling and reinforcing, the blending technology of a variety of general plastics and engineering plastics has been improved day by day. By the late 1970s, 60% of the world's thermoplastics had to be blended before they were processed with special materials or even once-formed products. Meanwhile, the research and development of various blending equipment (co-rotating twin screw, reciprocating single screw, continuous mixer, etc.) had also made considerable progress.
At present, with the increasing demand for product quality, working condition environment and automation, loss in weight feeder has been applied more and more widely. It is estimated that there are about 20,000 twin screw extruder production lines in the domestic market, of which less than 8% are equipped with weightlessness scales. In the past year, the proportion of 2000 new production lines equipped with loss in weight feeder is gradually increasing, about 10-20%, but the overall proportion is still very low, while the proportion of developed countries is 60-70% or higher. It is predicted that the demand for weightlessness will be explosive in the coming years.
In large-scale and continuous plastic processing, it is essential to equip loss in weight feeder with auxiliary peripheral equipment, such as storage system and automatic feeding to achieve complete feeding function.