Cov tawv tawv tawv tawv yog tsim los ntawm txhua yam kev pov tseg ntawm airmal tawv thiab dermal scraps uas yog crushed thiab tov nrog tshuaj raw khoom. Nws cov tshuab ua zauv (technology) yog tib yam li ntawm cov tawv ntoo tawv thiab daim tawv nqaij. Txawm li cas los xij, lub cev tawv nqaij feem ntau yog qhov hnyav thiab muaj lub zog tsis zoo, yog li nws tsuas yog siv rau cov khoom sib txawv xws li cov ntaub ntawv qis, rub lub hnab, thiab pob qws hau, thiab lwm yam. siv. Ntev ntev ntawm cov qauv fiber yog hom teeb meem, thiab ua rau lub zog sib xyaw ntawm cov kua qaub ntawm cov kua tau pom zoo.
Cov tawv tawv tawv kuj tau hu ua tawv tawv. Nws tuaj yeem raug siv los ua lub hau ntawm cov ntaub ntawv, cov ntaub ntawv ceev, phau ntawv journal.