Raws li kev lag luam sab hauv, kev ua phooj ywg ib puag ncig ntawm blockboard feem ntau yog nyob ntawm ib puag ncig tus phooj ywg ntawm cov nplaum siv hauv nws cov khoom. Txij li cov khoom siv tseem ceeb rau cov khoom siv ntoo yog urea -formaldehyde resin ua cov nplaum, cov nplaum no tau yooj yim, pheej yig, thiab yooj yim los tsim, ua rau nws yog cov khoom siv raw khoom uas cov khoom lag luam ntoo tau tso siab rau lub sijhawm ntev. Cov teb chaws txawv teb chaws pib tshawb nrhiav kev daws teeb meem rau formaldehyde kuab paug hauv xyoo 1960. Tsim lub teb chaws thiab cheeb tsam xws li Europe, Nyiv, thiab Tebchaws Meskas tau tsim cov qauv formaldehyde emission nruj me ntsis hauv xyoo 1990s. Los ntawm kev txhim kho thev naus laus zis tsis tu ncua, lawv maj mam ua tiav cov qauv kev lag luam sib npaug rau European E-chav kawm thiab Japanese F- cov qauv hauv chav kawm.
Laminated ntoo: Dawb los ntawm formaldehyde kev txhawj xeeb
Ib hom ntawm cov khoom siv laminated ua los ntawm cov khoom ntoo uas tsis ntev los no tau nkag mus rau hauv kev ua lag luam yuav tsum tau los ua ib qho kev hloov rau blockboard thiab lwm yam khoom siv ntoo. Raws li cov lus ceeb toom, lub rooj tsav xwm laminated no yog tsim los ntawm Alaskan spruce tuaj txawv teb chaws, txiav rau hauv ib daim hlab ntawm qhov ntev sib txawv, thiab koom nrog siv tus ntiv tes nrov thoob ntiaj teb- txoj kev sib koom ua ke. Vim tias tag nrho cov khoom siv hauv paus muaj cov khoom siv ntoo, cov nplaum tsuas yog siv rau kev sib txuas ntawm cov khoom siv ntoo, thiab siv thoob ntiaj teb lees paub ib puag ncig tus phooj ywg nplaum. Qhov siab tshaj plaws formaldehyde cov ntsiab lus tsuas yog 2mg / 100g, deb ntawm lub teb chaws tus qauv tsawg dua 9mg / 100g rau Class A ib puag ncig zoo nkauj panels. Txawm tias cov khoom tsim tshiab tshiab tsis muaj ntxhiab tsw.
Nws tau nkag siab tias hom laminated board no yog siv rau hauv kev tsim kho thiab kho vaj tse nyob hauv Europe, Tebchaws Asmeskas, thiab Nyiv. Txawm hais tias nws yog kim dua li blockboard thiab lwm yam khoom siv ntoo, nyob rau hauv cov nqe lus ntawm tag nrho cov ntsuas, tus nqi tsis ntau dua. Blockboard yuav tsum tau kho saum npoo, veneering, thiab xuab zeb nyob ntawm seb nws xav siv, yog li tus nqi kawg ntawm cov khoom tsim los ntawm blockboard tsis tsawg. Lub rooj tsavxwm laminated no, txawm li cas los xij, muaj qhov zoo nkauj thiab zoo nkauj spruce nplej, thiab tuaj yeem pleev xim ncaj qha yam tsis muaj xuab zeb ntxiv lossis veneering, ua rau nws tsim nyog rau cov vaj huam sib luag thiab rooj tog zaum, yog li khaws cov nqi tsim khoom qis.
