Txhawm rau ua kom cov npoo ntawm daim ntawv txiav los ntawm lub programmable ntawv txiav tshuab smoother, nws yog ib qho tsim nyog yuav tsum ua kom cov hniav ntse txaus thiab kho lub sharpening rau lub kaum sab xis tsim nyog. Txiav cov ntawv sib txawv yuav tsum tau kho kom haum rau cov kaum ntse ntse sib txawv. Yog tias txiav cov ntawv softer, cov hniav sib tsoo lub kaum sab xis tuaj yeem hloov kho rau 16 degrees; Yog tias koj xav txiav cov duab los yog kraft daim ntawv, kho lub kaum sab xis ntawm lub sharpening rau 20 degrees; Yog tias txiav cov ntawv luam ntawv feem ntau siv, kho nws mus rau 21 degrees.
Txhawm rau kom paub meej qhov zoo ntawm kev txiav, kev saib xyuas kev ua haujlwm yuav tsum ua kom zoo. Cov roj cav tsim nyog tuaj yeem muab ntxiv raws li lub caij sib txawv. Lub siab hydraulic yuav tsum tsim nyog. Yog tias lub siab siab dhau lawm, lub nplhaib sealing yuav tawg, thaum lub siab qis dhau, cov hniav txiav yuav tsis muaj zog. Koj tuaj yeem siv talcum hmoov los yog paraffin rau ntawm lub platform txiav thiab cov hniav kom txo tau kev sib txhuam.