Introduction to sheet machine, plastic molding classification

Sheet machine is an indispensable machine of plastic machinery, plastic extrusion equipment the most classic of the products. This product for other plastic equipment through the production of plastic molding materials. And molding equipment is currently in the plastic machinery mainly machinery, such as making a cup of machine is used to make plastic cups, disposable paper cup and cup with the equipment. Here introduce the classification of plastic molding plastics can be divided into two categories: thermoplastic and thermosetting plastic. ( 1) Thermoplastics. This kind of plastic resin molecular structure is chains or tree structure. It can be when heated with molding into a certain shape of plastic parts, after cooling has the shape of the shape. Such as reheating and softening melting, can be made into a certain shape of plastic parts, again so repeated many times, as a lunch box machine. Usually only in the process of the physical change and no chemical changes. Because this process is reversible, in the plastic processing of leftover material and scrap can be recycled and reused after crushed into particles. Such as polyethylene, polypropylene, polyvinyl chloride, polystyrene, ABS, polyamide, polyoxymethylene, polycarbonate, organic glass, polysulfone, fluorine plastic belongs to thermoplastic plastic pieces. ( 2) Thermosetting plastic. The plastic in a heated at the beginning of the molecular chain structure, plasticity and soluble, can be a certain shape with molding plastic parts. When continue heating, chain form chemical bonds between the main chain of the polymer molecules combined with, The crosslinking) Net-like structure, molecules, and molecules eventually become a mesh structure, become molten, neither does not dissolve, plastics fixed shape no longer change. In the process of forming, both a physical change and chemical change. Because of thermosetting plastic the above properties, so the processing of wastes and waste recycling use. Such as bakelite, amino plastics, plastics, organic silicon, epoxy silicone plastic belongs to heat the firmware plastic etc.