Cov khoom siv raw rau cov khob ntawv feem ntau yog ntawv. Txawm li cas los xij, hom ntawv tshwj xeeb siv los ua cov khob ntawv yog hu ua cupstock lossis khob ntawv. Cupstock yog qib tshwj xeeb ntawm daim ntawv uas tau tsim los ua kom tau raws li qhov tshwj xeeb ntawm kev tsim cov ntawv khob, suav nrog lub zog, ua haujlwm ntev, thiab tsis kam mus rau ya raws thiab cua sov. Cupstock feem ntau yog ua los ntawm kev sib xyaw ntawm cov kab mob nkauj xwb thiab qee zaum ib feem me me ntawm cov khoom siv rov ua dua tshiab. Cov nkauj xwb fibers yog los ntawm ntau hom ntoo, xws li softwood lossis hardwood, nyob ntawm seb cov khoom xav tau ntawm daim ntawv. Cov fiber ntau muaj pes tsawg leeg tuaj yeem sib txawv ntawm cov tuam txhab tsim khoom thiab tuaj yeem tsim kho kom tau raws li cov kev xav tau tshwj xeeb. Txhawm rau txhim kho kev ua tau zoo ntawm cov khob ntim khoom, ntau yam tshuaj ntxiv thiab kev kho mob tuaj yeem siv thaum lub sijhawm ua ntawv. Cov additives no muaj xws li sizing tus neeg sawv cev, uas txhim kho daim ntawv tsis kam mus rau cov kua nkag, thiab ntxiv dag zog rau cov neeg sawv cev, uas txhim khu nws durability thiab nruj. Nws yog tsim nyog sau cia tias cupstock feem ntau yog tsim los ntawm cov ntawv tshwj xeeb mills los yog cov converters uas tsim cov ntawv tshwj xeeb rau kev tsim khob. Daim ntawv yog tsim nyob rau hauv loj yob los yog nplooj ntawv thiab tom qab ntawd ua tiav nyob rau hauv daim ntawv khob-ua tshuab los ua lub khob zaum kawg.