Kev txhawb nqa thiab txuas ntawm qhov chaw: nws suav nrog sab saud thiab qis dua cov qauv, tuag cov leeg, cov phiajcim ntawm convex thiab concave tuag, rov qab daim hlau, nres tsheb, thiab lwm yam.; cov ntsej muag sab saud thiab qis dua yog cov theem pib ntawm kev tuag; ntau lwm ntu yog ntsia thiab tsau rau nws feem. Lub dav hlau loj ntawm lub ntuag, tshwj xeeb tshaj yog pem hauv ntej thiab tom qab kev taw qhia yuav tsum tau sib txuam nrog cov haujlwm, dhau lawm lossis loj dhau lawm yuav tsis zoo rau kev ua haujlwm. Qee qhov pwm (pam vov, xuas nrig ntaus pwm) yuav tsum tau teev lub phaj thaub qab hauv qab pwm txhawm rau kev yooj yim ntawm tawm qhov. Lub sijhawm no, nws yog qhov zoo dua los txuas lub phaj rov qab thiab tus qauv nrog cov ntsia hlau, thiab cov tuab ntawm ob daim phiaj thaub qab yuav tsum sib npaug. Qhov yov ntawm cov thim rov qab phaj yog raug rau cov seem uas tuaj yeem nqa tau, thiab yuav tsum tsis txhob loj dhau los tiv thaiv cov qauv tawg.
Hauv kev tsim cov tsheb stamping qhov chaw, piv rau stamping txias, txoj kev kub stamping tuaj yeem ua tau zoo rau hauv cov teeb meem ntawm lub teeb yuag thiab kev sib tsoo, thiab lub siab lub zog stamping qhov chaw hlav thiab pwm hnav, uas tau txais kev mloog. Kub stamping yog pom tau hais los ntawm nws txoj kev tuag. Txawm hais tias tus qauv tsim ntawm kev tuag yog tsim nyog lossis tsis ncaj yuav cuam tshuam rau qhov ua tau zoo ntawm kub stamping.
Thaum tsim cov qauv thermoforming pwm, cov kev txiav txim siab tseem ceeb suav nrog: kev teeb tsa ntawm cov ntxig txias txias, lub zog ntawm pwm, thiab cov pwm nruj. Ntawm lawv, qhov tseem ceeb tshaj plaws yog kev teeb tsa ntawm cov ntxig ntxig txias txias kom paub meej tias cov thermoformed seem muaj qee qhov kev ntsuas txias tom qab lawv tau tsim.
