Muaj ntau lub laj thawj rau bar ntuag thaum lub sij hawm extrusion granulation, uas tuaj yeem raug ntxig faib rau cov xwm txheej hauv qab no:
1. Muaj cov khoom siv tsis zoo hauv cov ntaub ntawv raw, thiab nws yog qhov yuav tsum tau soj ntsuam seb cov khoom ntawm qhov chaw pub khoom noj puas muaj cov khoom siv tsis zoo;
2. Kev ua kom tsis zoo (plasticization), kev ua haujlwm kub yuav tsum tau nce; ntev dhau ntawm cov roj nplua nyeem ntxiv ua rau cov khoom siv tsis zoo;
3. Lub taub lim tau thaiv, hloov cov lim;
4. Tus lej ntawm lub qhov tuag tsis yog, thiab cov khoom siv poob yog sib npaug;
5. Lub cav extrusion siab dhau heev, thiab cov khoom hauv cov ntsia hlau tsis txaus. Nws yog ib qho tsim nyog yuav tau nce lub sijhawm pub mis thiab nce tus naj npawb ntawm lim meshes.