I nā makahiki i hala iho nei, i loko o ke kaʻina hana plastik, kahi ala kaulana loa o ka hoʻokumu ʻana, ʻo ka ʻōwili ʻana i ka plastic processing. ʻO ka hoʻoheheʻe ʻia ʻana, ʻike ʻia hoʻi ʻo rotary molding, rotary molding, he ʻano hana hollow hollow thermoplastic. Ua hoʻokumu ʻia ka hoʻoheheʻe ʻana i nā makahiki 1940 ma United Kingdom, ua puka mai ka ʻōwili ʻia i ka makahiki 188...
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