Tshuab moulding, tseem hu ua hollow tshuab moulding, yog txoj hauv kev txhim kho yas sai. Cov tubular yas parison tau los ntawm extrusion lossis txhaj tshuaj molding ntawm cov thermoplastic cob tau muab tso rau hauv cov pwm sib cais thaum nws kub (lossis ua kom sov mus rau lub xeev muag muag). Tom qab cov pwm raug kaw, cov huab cua tau txhaj rau hauv lub parison kom tshuab cov yas parison Nws nthuav dav thiab txuas mus rau sab hauv phab ntsa ntawm cov pwm, thiab tom qab txias thiab rhuav tshem, ntau yam khoom hollow tau txais. Cov txheej txheem tsim khoom ntawm zaj duab xis tshuab yog qhov zoo sib xws hauv txoj cai los tshuab cov khoom hollow, tab sis nws tsis siv cov pwm. Los ntawm kev xav ntawm kev ua cov txheej txheem yas txheej txheem, txheej txheem txheej txheem ntawm zaj duab xis tshuab yog feem ntau suav nrog hauv extrusion. Cov txheej txheem tshuab moulding tau siv los tsim cov ntom ntom ntom polyethylene vials thaum Tsov Rog Ntiaj Teb Zaum Ob. Xyoo 1950s lig, nrog rau kev yug me nyuam ntawm polyethylene high-density thiab kev txhim kho tshuab moulding tshuab, tshuab moulding tshuab tau siv dav. Lub ntim ntawm lub thawv ntim tuaj yeem ncav ntau txhiab litres, thiab qee qhov kev tsim khoom tau siv lub computer tswj. Cov yas haum rau tshuab moulding muaj xws li polyethylene, polyvinyl chloride, polypropylene, polyester, thiab lwm yam. Cov thawv ntim tau ua tau dav siv ua cov ntim khoom ntim.
Raws li cov txheej txheem tsim khoom ntawm kev sib cais, tshuab moulding tuaj yeem faib ua extrusion tshuab moulding thiab txhaj tshuaj moulding, thiab tsim tshiab txheej txheej txheej tshuab moulding thiab ncab tshuab moulding.
