Injection molding is a forming method used widely, there are many distinctive features compared with other forming technology:
  1.advantages of injection molding. Because the molding material melting and flow modeling is respectively in the barrel and the mold cavity, the mold can be always in the melt quickly condensation or curing condition, so as to shorten the molding cycle. When the first locking mold molding will melt into, coupled with good fluidity of melt wear on the die cavity is very small, so a set of mold can produce large quantities of injection molding products. An operator can manage two or more sets of injection molding machine, particularly a piece can automatically discharge can also manage more machine, therefore, the labour needed is relatively low. Molding process, mold, plastic injection mold, feeding, and release all the molding process are completed by the injection action, so that the injection molding process is easy to realize full automation and process control. Because of the forming pressure is very high, thus forming complex shape, plastic surface pattern and clear mark and high dimensional precision. By CO injection molding in more than one material, can effectively formed skin hard core foaming material, can the thermosetting plastic and fiber reinforced plastics. Due to molding the precision molds and precision hydraulic system, combined with the use of crisis control, products with high precision can be got, collective tolerance can reach 1um. High production efficiency, a set of die can contain dozens or even hundreds of cavity, thus forming a can forming dozens or even hundreds of plastic parts. The molding plastic parts, only a small amount of rest can use, reuse, therefore, waste is generated in the process of forming can be injection molded on the waste of raw materials with little.
  2.injection molding defects. The key equipment of injection molding is mould, cycle but mold design, manufacture and testing of the long, slow production. Because the cooling conditions, so for the thick wall and the change of big plastic molding difficult. Because of injection molding machine and mold cost is higher, so start large investment, it is not suitable for small batch production of plastic parts. The quality of molding products, limited by many factors, so the technical requirements of the higher, the more difficult to master.