In the early design process of industrial products, forming materials will be selected. Because the tone of materials is closely related to the production, assembly and completion time of products. In addition to these, the verification level of quality, market sales and price determination also need to be considered.
So, what are the commonly used injection molding materials?
1. As styrene acrylonitrile copolymer
It is generally used in the packaging and manufacturing of electrical, household goods, automotive industry, household goods, cosmetics, etc.
Process conditions of injection molding: dry treatment. If the storage is not appropriate, as will have hygroscopic properties. Melting temperature, between 200 and 270 degrees. For processed thick wall products, the melting temperature lower than the lower limit can be used. The mold temperature is between 40 and 80 degrees, while for reinforced materials, the mold temperature generally will not exceed 60 degrees. Attention should be paid to the design of the cooling system, because this time it directly affects the appearance, shrinkage and bending of the products.
Injection pressure: 350-1300bar, high-speed injection is recommended.
2. Polystyrene
Polystyrene is a kind of thermoplastic, which is transparent when it is not colored. The sound of knocking products will have the crisp sound of metal, with good gloss and transparency, but it is brittle and easy to produce cracks.
Process conditions of injection molding: drying treatment: unless stored improperly, drying treatment is usually not required. Melting temperature: between 180 and 280 degrees. For flame retardant materials, the upper limit is 250 degrees. Mold temperature, between 40 and 50 degrees.
Injection pressure: 200-600bar, rapid injection is recommended.
3. ABS resin
ABS material is an engineering plastic, which is mainly composed of copolymers of acrylonitrile (a), butadiene (b) and styrene (s).
4. Carbonate
Referred to as PC engineering plastics, PC material is a kind of engineering plastics. PC is an amorphous thermoplastic resin with excellent comprehensive performance, which has excellent electrical insulation, extensibility, dimensional stability, chemical corrosion resistance, high strength, heat resistance and cold resistance; At the same time, its advantages include self extinguishing, flame retardant, non-toxic, colorable, etc., which are very commonly used in engineering production.
At the same time, PC plastic is widely used in life, and its cost is low due to its large-scale industrial production and easy processing characteristics. Because of its good strength and toughness, its strength can meet various needs from mobile phones to bulletproof glass. However, its disadvantage is that it is not hard enough compared with metal, which leads to its appearance being easy to scratch.
The above are injection molding materials that are common in industrial production. These are only commonly used in production. There are many injection molding materials that are not commonly used but have their own characteristics. In the process of production, materials need to be selected according to production needs. The price of injection molding materials will also vary according to different types, models, market environment and so on.