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Rotational molding technology emerged in 1930s. After 60 years of development, its equipment and technology have been developed. Today's toys are made by rolling molding, from small children's toys to common car plastic parts until huge engineering plastic products, especially super large and non - standard hollow plastic products. Because of the limitation of the plastic processing technology itself, it can only be completed by the rotational molding process. In general, rotational molding is mainly used in thermoplastic materials, and thermosetting materials such as crosslinked polyethylene are also developing rapidly. Because the rolling molding does not require higher injection pressure, higher shear rate, or accurate polymer metering, the mold and machine are lower and the service life is long.
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