Kev tso zis tso caij yog qhov chaw tsim khoom tseemceeb hauv kev lag luam kev tsim kho, siv ib lossis ntau dua cov rooj tso caij tso caij nyob hauv lub thawv kheej kom tsim kho, zoo li, thiab tso cov duab ntsuas nyuj siab los ntawm lub duab uas muaj duab los tsim cov khoom siv tas li. Qhov kev txiav txim siab tseem ceeb yog kev tso khoom siv duab (feem ntau nyob rau hauv duab ntawv lossis duab powder) mus rau hauv lub thawv, uas nws tau raug sib tshooj los ntawm qhov kev tso caij tso caij. Thaum cov khoom siv ncav ncav, nws tau raug sib npaug los ntawm qhov kev tso caij tso caij thiab sib cuag los ntawm cov dej tso caij tso caij uas muaj kev tswj xyuas, uas ua rau nws sov. Lub duab sov yog tshuab, zoo li, thiab tso tawm hauv kev nyuj siab los ntawm lub duab, uas muaj qhov sib piv sib xws—yog li tus rooj, duab, sheet, lossis filament. Cov ntaub ntawv tseem ceeb muaj cov rooj tso caij tso caij (qhov siab tshaj plaws ntawm chaw tsim khoom), lub thawv (lub cylinder uas muaj kev nyuj siab), qhov kev lag luam meej pem thiab gearbox kom tso caij tso caij, qhov kev tswj xyuas tshuab tso caij tso caij rau lub thawv, thiab qhov tso khoom siv. Cov rooj tso caij tso caij muaj qhov sib txawv ntawm qhov ntev thiab qhov ntev-tos-daim (L/D) ratio, uas txiav txim siab qhov kev sib thooj thiab sijhawm nyob. Lawv yog cov neeg lag luam tseem ceeb hauv kev lag luam plastics, pab tau ntau yam kev lag luam, xws li kev tso caij tso caij ntawv, rooj, thiab duab; kev ntxuav kab thiab kab; thiab kev tsim kho ntawv thiab filament. Qhov kev sib piv kuj tseem muaj nyob hauv lwm cheeb tsam, xws li kev lag luam khob rau pasta thiab cereals, thiab kev kho mob rau kev pab kho mob. Kev pab pawg tseem ceeb nrog kev pab pawg tshiab hauv kev tsim kho rooj tso caij tso caij, kev tswj xyuas kev lag luam kom zoo dua, thiab kev sib sau ntawv ntawm kev lag luam hlau kom pab pawg thiab kev lag luam zoo dua.