Hardwood vs Softwood
Hardwood yog dab tsi? Ntoo tau los ntawm cov ntoo angiosperm yog hu ua hardwood. Hom ntoo no feem ntau yog temperate thiab dav dav. Lub npe 'Hardwood' tsis yog ib txwm hais tias hom ntoo no ib txwm tawv thiab nws tuaj yeem muag ib yam nkaus. Qhov ntau ntawm hardness sib txawv heev nrog rau qhov ceev ntawm ntau hom hardwood. Muaj cov ntoo tawv uas yog mos heev thiab ntawm qhov tod tes muaj cov ntoo tawv tawv uas nyuaj heev. Hardwood yog siv nyob rau hauv kev tsim kho vaj tse, nyob rau hauv kev tsim cov khoom siv rau ua noj ua haus lub hom phiaj thiab nyob rau hauv kev tsim ntawm ntau hom rooj tog. Ib qho tshwj xeeb ntawm cov ntoo no yog tias nws muaj qhov pores hauv nws.
Softwood yog dab tsi? Hom ntoo uas tau los ntawm conifers yog hu ua Softwood. Cov ntoo no tseem hu ua Fuchwood, Clarkwood lossis Madmanwood. Cov ntoo los ntawm cov ntoo uas tau txais cov ntoo feem ntau yog softer dua li cov ntoo uas tau txais. Txawm li cas los xij, muaj cov ntoo softwood uas tuaj yeem nyuaj dua li ntau hom hardwoods. Tsob ntoo los ntawm softwood tau txais yog cov ntoo loj hlob sai. Feem ntau, softwood yog tau los ntawm cov ntoo uas nyob ntsuab los ntawm tag nrho cov huab cua. Ntau cov rooj tog zaum, cov khoom siv thiab cov khoom siv yog tsim los ntawm cov ntoo mos vim yog vim li cas nws yooj yim dua dua tshiab piv rau cov ntoo tawv.
Qhov txawv ntawm Hardwood thiab Softwood
Softwood thiab hardwood yog tau los ntawm ntau hom ntoo thiab muaj ntau qhov sib txawv ntawm ob qho no. Qee qhov sib txawv no tau tham ntawm no. Hardwood yog tau los ntawm cov ntoo uas muaj nyob rau hauv ntau qhov chaw ntawm lub ntiaj teb no whereas Softwood yog tau tshwj xeeb los ntawm cov ntoo uas muaj nyob rau hauv Northern Hemisphere. Tus nqi ntawm kev loj hlob ntawm hardwood yog qeeb dua li ntawm softwood ua softwood feem ntau siv hom ntoo hauv rooj tog. Cov ntoo uas muab ntoo tawv poob rau ntawm lawv theem ntawm kev loj hlob thaum cov ntoo softwood feem ntau hu ua 'Evergreen' ntoo vim lawv lub neej ntev. Hardwood yog tuab heev li piv rau cov softwood uas yog tsawg ntom. Txawm hais tias softwood yog siv nyob rau hauv rooj tog kev lag luam ntawm ib tug loj teev, nws muaj tsawg durability piv rau hardwood. Softwood yog siv rau ntawm qhov loj me rau kev tsim cov rooj tog thiab tsim tsev thiab cabins. Hardwood yog siv nyob rau hauv ib tug me me nplai thiab muaj nyob rau hauv cov rooj tog tsim thiab trimmings tab sis nyob rau hauv ib tug qis scale piv rau softwood. Tus nqi ntawm hardwood yog siab npaum li piv rau cov softwood. Hardwood yog kim heev uas ua rau muaj kev txwv tsis pub siv ntoo hardwood hauv rooj tog thiab lwm qhov chaw. Lub microscopic qauv ntawm ob hom ntoo kuj txawv ntawm ib leeg. Cells ntawm tsuas yog ob hom muaj nyob rau hauv Softwood uas yog transverse ray hlwb thiab longitudinal ntoo fibers. Ntawm qhov tod tes, cov ntoo tawv tawv muaj qhov pores hauv nws uas tso cai rau kev thauj mus los yooj yim ntawm cov dej hauv cov ntoo nyuaj piv rau cov ntoo mos. Hardwood feem ntau yog siv hauv pem teb thiab hauv kev tsim cov rooj tog zoo. Hardwood kuj tau ua haujlwm hauv kev tsim cov nkoj thiab cov khoom ua si ntoo. Softwood yog siv rau hauv kev tsim kho ntawm qee lub tsev, ntaiv, thiab hauv decking nrog rau qee cov rooj tog.
