(1) Use barrel cleaner
If the raw materials for injection products are changed frequently or the plasticizing temperature range of the residual material in the barrel and the refueling material is greatly different, in order to save raw materials and improve work efficiency, it is more economical to use barrel cleaners. Special cleaning agent is a kind of rubber-like material. It does not melt in the barrel at high temperature. It is in the form of a softened rubber mass in the screw groove of the screw. It can take away the residual material when moving forward in the screw groove of the screw to make the barrel Get cleaned inside.
(2) Adopting refueling ejection method
If the plasticizing temperature range of the raw material to be changed is higher than the plasticizing temperature range of the residual material in the barrel, the barrel and nozzle can be heated up to the minimum plasticizing temperature of the newly changed material, and then the new material is added and continuous air injection is performed. Until there is no residue in the barrel.
If the plasticizing temperature range of the residual material in the barrel is higher than the plasticizing temperature range of the material to be replaced, the barrel should be heated up to the plasticizing temperature range of the residual material in the barrel to remove the residual material. Later, the nozzle material can be added for cleaning, and the new material is finally put into production. If the product requirements are high, the first few molds of the new material can be discarded.
