Blow molding is a good technique for molding these toys but mostly if the product has to have a relatively strong and lightweight outer shell. It also has a cycle time at least 10x faster than rotational molding. But the advantages of rotomolding are that it works for more types of polymers including soft PUs, tooling costs are much lower, and it is easy to experiment with production parameters. That is the reason why these toys are often rotationally molded.
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