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Injection molding is one of the most commonly used methods in the processing of thermoplastic plastics. It is suitable for the processing of various thermoplastics. Its molding cycle is short, the color and variety are many, the shape can be simple to complex, the size can be small and the size is accurate. , Easy to replace the product. Injection products are widely used in industrial, agricultural, household, construction and other fields.


(A) the main process


Injection molding is the use of injection molding equipment, the thrust of the molten plastic into the closed mold of the plastic, after cooling and curing stereotypes stripping that was products. Injection molding is a cycle process, including the mold, raw material pre-plastic, injection molding, holding pressure molding, mold release five steps, known as a molding cycle. In a molding cycle, the completion of injection molding generally undergo pre-plasticization, injection and stereotypes three stages.


1. In the injection molding machine to complete the screw section, and the plastic melt material stored in the plastic injection molding machine at the front.


2. Under the action of hydraulic injection molding machine screw forward, will be stored in the front of the molten material barrel push forward, through the mold runner and gate, the molten material into the closed mold cavity.


3. Molten material flow and filled with cavity, the pressure and cooling a certain time to make the material solidification stereotypes, and then open the mold that was products.


(B) of the major equipment


Injection molding of the main equipment is injection molding machine, divided into two kinds of screw and plunger, screw injection is the melting of the material concentrated in the screw front, and then move the screw by the thrust material into the mold molding processing methods; plunger Injection molding is the raw material into the screw extruder to melt extrusion to the front of the storage tank, and then through the plunger thrust injection molding a method in the mold, plunger injection molding method is conducive to small extruder production Large injection molded parts.