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The Structure of The Plastic Mould

  • The plastic mould structure mainly consists of a concave mould with variable cavities consisting of a concave mould combination substrate, a concave mould assembly and a concave mould combination plate, and a convex mould with variable cores consisting of a convex mould combination substrate, a convex mould assembly, a convex mould combination plate, a cavity cut-off assembly and a side cut-off combination plate.


    In order to improve the performance of plastics, various auxiliary materials such as fillers, plasticisers, lubricants, stabilisers and colourants are added to the polymer to make it a good performing plastic.


    1、synthetic resin is the most important component of plastics, and its content in plastics is generally 40% to 100%. Because of the large content and the fact that the nature of the resin often determines the nature of the plastic, people often see resin as synonymous with plastic. For example, polyvinyl chloride resins are confused with polyvinyl chloride plastics and phenolic resins with phenolic plastics. In fact, resin and plastic are two different concepts. Resin is a raw, unprocessed polymer that is used not only to make plastics but also as a raw material for paints, adhesives and synthetic fibres. The vast majority of plastics, in addition to the main component resin, require the addition of other substances to make big piano-key switch plastic mould.


    Big Piano-key Switch Mould



    Fillers are also called fillers, which can improve the strength and heat resistance of plastics, and reduce costs. For example, the addition of wood flour in phenolic resin can greatly reduce the cost, making phenolic plastic one of the cheapest plastics, but also significantly improve the mechanical strength, but also improve big piano-key switch plastic mould quality. Fillers can be divided into organic fillers and inorganic fillers two categories, the former such as wood flour, rags, paper and a variety of fabric fibres, etc., the latter such as glass fibres, diatomaceous earth, asbestos, carbon black, etc.




    Plasticizers can increase the plasticity and softness of plastics, reduce brittleness, so that plastics are easy to process molding. Plasticizers are generally miscible with resin, non-toxic, odourless, light and heat stable high boiling point organic compounds, the most commonly used is phthalate esters. For example, in the production of PVC plastics, if more plasticizers are added, soft PVC plastics can be obtained; if no or less plasticizers are added (dosage <10%), rigid PVC plastics can be obtained.




    In order to prevent the decomposition and destruction of synthetic resins by light and heat during processing and use, and to extend the service life of big piano-key switch plastic mould, stabilizers are added to the plastic. Commonly used are stearate, epoxy resin, etc.


    5、Coloring agent


    Coloring agents can make big piano-key switch plastic mould have a variety of bright, beautiful colours. Organic dyes and inorganic pigments are commonly used as colorants.




    The role of the lubricant is to prevent the plastic from sticking to the metal mould when forming, and at the same time can make the surface of the plastic smooth and beautiful. Commonly used lubricants are stearic acid and its calcium and magnesium salts. In addition to the above additives, the plastic can also add flame retardants, foaming agents, anti-static agents, etc.


    As a professional big piano-key switch plastic mould manufacturer, Tangram Mould Manufacturing Company has professional technicians with excellent skills and mechanical equipment to occupy its own business territory in the manufacturing of big piano-key switch plastic mould.