Kev tsim kho tshuab xws li txoj kev rollers yog peev- siv zog, thev naus laus zis- cov khoom lag luam hnyav muaj feem xyuam nrog kev lag luam. Lawv koom nrog ntau yam thev naus laus zis thiab ntau yam kev lag luam ua lag luam. Cov ntsiab lus thev naus laus zis ntau ntxiv ntawm cov khoom siv cav tseem ceeb ntawm cov khoom lag luam yuav tsum muaj kev koom tes zoo los ntawm ntau lub tuam txhab txhawb nqa; kwv yees li 60% -70% ntawm cov khoom yuav tsum tau muab los ntawm cov chaw tsim khoom tshwj xeeb. Kev tsim ntawm txoj kev rau cov menyuam mainframes feem ntau suav nrog tag nrho cov khoom tsim, kev tsim khoom tsim, thiab kev xaiv thiab sib dhos ntawm cov khoom txhawb nqa.
Tom qab ntau tshaj 40 xyoo ntawm kev txhim kho tas mus li, Tuam Tshoj txoj kev lag luam rau cov menyuam yaus tau ua rau muaj kev vam meej. Tshwj xeeb tshaj yog txij li xyoo 1990, kev tsim khoom thiab muag ntim ntawm txoj kev rollers tau loj hlob sai, nrog rau cov tuam txhab loj hlob tuaj koom nrog txoj kev tsim khoom lag luam. Qhov no tau coj tus naj npawb ntawm cov neeg tsim khoom rau ntau tshaj 80, muaj peev xwm tsim tau cov khoom lag luam ua tiav, suav nrog 5-30t vibratory rollers, 4-24t static rollers, thiab 16-30t pneumatic log tsheb rollers. Txoj kev ua tiav txoj kev tsim khoom muaj peev xwm ntawm kev ywj pheej ntawm kev tsim khoom thiab kev tsim khoom tau tsim, thiab qhov sib txawv ntawm nws cov txheej txheem thev naus laus zis thiab qib siab thoob ntiaj teb tau maj mam nqaim. Qhov kev loj hlob sai no yog khi rau txhawb txoj kev lag luam rau kev lag luam mus rau lub sijhawm tshiab ntawm kev txhim kho. 2007 yog lub xyoo tseem ceeb rau lub teb chaws "Tib Hlis Tsib Xyoo," nrog rau kev siv zog ntau ntxiv hauv kev loj hlob thiab kev tsim kho ua ntej tshaj li qhov kev xav tau thoob plaws hauv lub tebchaws, uas txhawb kev lag luam kev xav tau rau qee yam. Kev muag thoob teb chaws ntawm txoj kev rollers mus txog 9,841 units hauv 2007, txuas ntxiv txoj kev loj hlob. Txoj kev muag khoom ntawm cov menyuam tau tswj hwm qhov kev nce siab, nrog 18 txoj kev cov menyuam cov tuam txhab muag tag nrho ntawm 6,086 units txij lub Ib Hlis mus txog rau Lub Rau Hli. Kev muag khoom ntawm cov khoom loj tau nce 16.43% piv rau tib lub sijhawm xyoo 2007.
