Plastic Parts
What are injection molds and compression molds? What are the differences?
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Although the structure of the mold may vary greatly due to different types and properties of plastic, the shape and structure of plastic products, and the type of injection machine, the basic structure is the same.Injection molds are divided into thermosetting plastic molds and thermoplastic plastic mold types according to the molding characteristics; they are divided into plastic transfer molds, blow molds, casting molds, thermoforming molds, hot compression molds (compression molds), injection molds, etc. according to the molding process. Among them, the hot press mold can be divided into overflow type, semi-overflow type and non-overflow type according to the overflow method, and the injection mold can be divided into cold runner mold and hot runner mold according to the pouring system; The classification of the mold is also distinguished according to the different processing techniques. The injection mold is to inject the molten plastic into the cavity of the mold at a certain speed and pressure. After the plastic is cooled, open the mold to take out the molded injection product.
Compression mold short compression mold_add plastic raw material directly into the open mold cavity, close the mold, the plastic becomes a flowing state and fills the cavity under the action of heat and pressure, and then the product is chemically crosslinked or physically cooled to make the product Hardening and setting.
Compression molding is an important technical process in molding processing. It has a wide range of applications in industrial production and industrial processing, and plays an important role in people's lives. Generally, powdery, granular, agglomerated, flake, or even shaped blanks similar to the product are first placed in the cavity in the heated mold, and then closed and compressed to form and solidify or vulcanize, and then The product obtained by demoulding (this), this method is particularly suitable for the molding process of thermosetting plastics (see thermosetting resins). The disadvantages are long production cycle, low efficiency, and poor dimensional accuracy of the product.
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