Nyob rau hauv xyoo tas los no, nyob rau hauv cov txheej txheem yas, ib txoj kev nrov heev ntawm kev tsim, yog dov yas ua. Roll molding, tseem hu ua rotary molding, rotary molding, yog ib txoj kev thermoplastic hollow molding. Roll molding originated nyob rau hauv 1940s nyob rau hauv lub tebchaws United Kingdom, yob molding tuaj tawm nyob rau hauv 188 ...
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