Txoj kev yog tsim los ntawm William Tebchaws Britain thaum xyoo 1893 rau kev ua cov khoom ua si qaug ua si. Nws siv cov khoom siv tsawg dua cov khoom pov thawj, thiab ua rau cov khoom sib zog thiab tsis tshua kim. Hollow casting figures feem ntau muaj ib lub qhov me me qhov twg cov kua ntau dhau heev lawm.
Ib yam li cov txheej txheem hu ua slush molding yog siv los ua cov khoom siv hluav taws xob, siv rau cov khoom siv hluav taws xob, nrog rau cov tawv nqaij, qhov chaw uas muaj qhov dawb (uas coj zoo li cov kua) cov hmoov yas; PVC los yog TPU, yog muab nchuav rau hauv qhov kub, hollow pwm thiab daim tawv nqaij khov; Tshem tawm ntau tshaj tawm ces dej tawm, cov pwm yog txias, thiab cov khoom moulded stripped tawm.
Low-pressure