Feem ntau, qhov sib tw ntawm ob hom pwm tuaj yeem nyob ntawm thawj cov ntaub ntawv. Vim hais tias thawj cov ntaub ntawv twb tuav lub contour ntawm tus yas, lub secondary khoom tsis shrink ntau. Yuav ua li cas los txiav txim siab thawj thiab lwm yam ntaub ntawv, muaj ntau yam kev xav txog, xws li kev khiav ntawm raw cov ntaub ntawv, cov khoom ntawm plastics, thiab ntxiv rau.
Rau ob-xim pwm, yog tias nws tsuas yog raug daig, tib cov roj hmab yog ib qho yooj yim los daws, thiab lub shrinkage ntawm cov khoom yog tib yam. Yog hais tias nws tsis yog tib yam khoom, lub shrinkage ntawm ob roj hmab cov ntaub ntawv tsis zoo li qub. Yog hais tias qhov sib piv tsis tau, nws yuav ua kom deformed. Yog cov roj hmab hnyav yog 0.005, cov roj hmab muag yog 0.018, raws li cov dej ntws yaug, tsis yog ntau cov yas muag yuav ntau heev, txhua txoj kev kov qhov sab nrauv tsis txav, yog tsis raws li lawv tso tawm, yuav tsis ua mos rubber tshooj Qhov loj me me uas tawm los yuav ntau me me, nws tsis muaj dab tsi yog qhov loj me me, thiab yog hais tias nws loj dhau lawm, nws yuav nyuaj heev.
Cov tshuaj yog tias yog ob qhov ntsws, 0.005 thiab 0.018, ncaj qha los ntawm 0.005, ntsaub zog kua nplaum kom muab tso rau. Xws li lub nplhaib muag ntawm qhov ntswg, yuav kho li cas? Kev siv roj hmab, feem ntau, yuav tsis pub tshaj 2MM, ntau dua li yuav thim, yog li ntawd qhov txawv ntawm nws ntsws yog qhov thickness ntawm qhov 2MM, qhov uas peb niaj hnub xav. Yog tias muaj qhov sib txawv hauv qhov siab ntawm cov roj hmab muag, yuav tsum muaj lub zais hauv cov kev taw qhia Z. Vim hais tias muaj cov kua nplaum tawv, lub zawm ntawm cov khoom muag hauv Z coj tau thaiv, thiab muaj tsis muaj chaw rau nws mus deform.