Just like the casting of metals, the plastic casting process is also a very important process to produce various kinds of plastic parts. In plastic casting processes, both thermoplastics and thermosetting can be poured. This is the biggest advantage of plastic casting processes.
There are several plastic casting methods are used in industry;
In plastic casting processes, the used molds are simpler than other plastic molding processes such as injection molding. Another advantage of plastic casting processes is the suitability of low production quantities. This is also because of the requirement of particularly more time to complete one process cycle.
Viscoelastic memory is one of the most important problems in most plastic injection and extrusion processes. So, there is no problem with die swell or other types of problems caused by the viscoelastic memory of polymers.
The main disadvantage of the plastic casting process is the very high rates of shrinkages. About 20% of shrinkage may occur in plastic casting processes. This is a very high rate compared with metals. So, consideration of shrinkage is very important in plastic casting processes.
The pouring and forming of thermosetting plastics in molds are slightly different than thermoplastics. Because of the cross-linking nature of thermosetting, primary ingredients of thermosetting material are poured inside molds. Also, other additives such as catalysts are added to improve cross-linking. When cross-linking occurs, solidification also occurs.
Thermosetting material must be suitable for casting operations. Very rapid rates of cross-linking are not suitable for the casting method. So, thermoplastic material must have slow rates of cross-linkings.
Plastic casting is also a special process to obtain special parts. This is the summary information about plastic casting.
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