Plastic injection moulding is a complex process. The entire process cycle is often one to several minutes, and the most critical filling process is generally only tens of seconds. In this short process cycle, plastics experience a very complex thermal and rheological history.
Similar to a syringe for injection, with the help of the thrust of the screw (or plunger), the plastic in the plasticized molten state (i.e. viscous flow state) is injected into the closed mold cavity, and the product is obtained after curing and shaping.
Plastic injection moulding is a cyclic process, each cycle mainly includes: quantitative feeding - melting and plasticizing - pressure injection - mold filling and cooling - mold opening and taking out. After the plastic parts are taken out, the mold is closed again for the next cycle.
1. Plastic injection moulding uses glass fiber
In plastic injection moulding services, the most common way to improve the mechanical properties of plastic materials is to add glass fibers.
Glass fibers improve structural properties such as strength and stiffness, and they reduce part shrinkage. Glass filled resins can be of different colors.
On the downside, fiberglass can make parts brittle and reduce impact strength. Fiberglass also reduces the life of plastic molds and causes wear on the barrels and nozzles of plastic injection moulding machines. Glass-filled resins also increase the viscosity of the material, making plastic mold cavities more difficult to fill.
2. Plastic injection moulding using carbon fiber
Carbon fiber fillers can improve the mechanical properties of plastic materials. Carbon-filled plastic parts have similar mechanical properties to glass-filled plastics, but are stronger and lighter.
Carbon fibers are conductive, so carbon-filled parts have better electromagnetic shielding properties. Carbon fiber improves structural properties such as strength and stiffness more than glass fiber, reducing shrinkage of parts.
The main disadvantage of carbon fillers is that they are expensive. Like fiberglass, carbon fiber can make parts brittle and reduce impact strength; reduce plastic mold life and cause plastic injection moulding machine barrels and nozzles to wear out. Carbon fiber also increases the viscosity of the material, making plastic molds harder to fill.
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