Cov ntaub ntawv raw rau chipboard

Cov khoom siv raw rau kev ua particle board muaj xws li ntoo lossis ntoo fiber ntau cov ntaub ntawv, cov nplaum thiab cov khoom ntxiv. Cov qub tso nyiaj rau ntau tshaj 90% ntawm qhov hnyav qhuav ntawm lub rooj tsavxwm. Ntoo raw cov ntaub ntawv feem ntau yog muab los ntawm cov ntoo txiav hauv hav zoov, cov ntoo me me (qhov txoj kab uas hla feem ntau yog qis dua 8 cm), sau cov seem thiab ua cov khoom seem. Ua tiav rau hauv flakes, strips, koob, granular wood chips, ntoo shavings, ntoo hlau, sawdust, thiab lwm yam, hu ua seem. Tsis tas li ntawd, cov ntaub ntawv uas tsis yog ntoo xws li cog stalks thiab noob hulls kuj tuaj yeem ua rau hauv daim hlau, thiab lub npe feem ntau muaj npe tom qab cov ntaub ntawv siv, xws li hemp stalk (shaving board) board, bagasse (shaving board) board, thiab lwm yam. Adhesives feem ntau siv urea-formaldehyde resin kua nplaum thiab phenolic resin kua nplaum. Cov qub muaj lub teeb roj xim thiab kub curing tsawg. Nws muaj kev sib raug zoo zoo ntawm ntau yam khoom siv cog xws li nplej straw thiab nplej husks. Qhov kub nias kub yog 195-210 degree C. Nws yog dav siv hauv kev tsim khoom, tab sis muaj qhov tsis zoo ntawm kev tso tawm dawb formaldehyde los ua paug rau ib puag ncig.

Cov duab ntawm cov shavings yog qhov txiav txim siab rau qhov zoo ntawm lub rooj tsavxwm, yog li ua ntej ntawm tag nrho cov, tsim nyog shavings yuav tsum tau tsim. Cov ntoo shavings seem hauv kev ua ntoo tuaj yeem siv los ua cov txheej txheem tseem ceeb ntawm pawg thawj coj saib tom qab rov ua dua. Cov shavings saum npoo yog tsuas yog ua tiav thiab ua los ntawm cov qib siab residues (ntoo truncation, board edge, thiab lwm yam) hauv kev sau los yog ua. Qhov ntev, tuab thiab dav ntawm shavings sib txawv raws li cov txheej txheem ntau lawm thiab cov tub ntxhais txheej lossis txheej txheej. Cov cuab yeej siv rau kev npaj shavings suav nrog chippers, rov crushers, sanders thiab fiber separators, thiab txiav txoj kev muaj xws li txiav, txiav thiab crushing. Txhawm rau kom tau txais cov ntoo zoo nkauj, nws yuav tsum tau mus los ntawm cov txheej txheem ntawm thawj crushing, sib tsoo, crushing thiab sieving.

Cov txheej txheem ntoo shavings muaj qhov pib ya raws ntawm kwv yees li 40 mus rau 60%, txheej txheej tseem ceeb ntawm 2 mus rau 4% thiab txheej txheej ntawm 5 txog 9%. Yog li ntawd, nws yog ib qho tsim nyog yuav tau siv lub tshuab ziab khaub ncaws kom qhuav shavings nrog cov ntsiab lus ntawm cov dej pib sib txawv kom ua tiav cov ntsiab lus dej zaum kawg. Tom qab ntawd cov ntoo qhuav shavings yog tov nrog kua kua nplaum thiab additives. Feem ntau, 8-12 grams ntawm sizing yog siv rau ib square meter ntawm thaj tsam ntawm ntoo shavings. Tom qab tau txau los ntawm lub nozzle, cov khoom siv roj hmab dhau los ua cov kab nrog txoj kab uas hla ntawm 8 mus rau 35 microns, tsim cov roj hmab uas nyias nyias thiab tsis tu ncua ntawm cov shavings. Tom qab ntawd sizing cov shavings rau hauv ib lub slab, lub thickness ntawm uas yog feem ntau 10 mus rau 20 npaug ntawm cov thickness ntawm cov khoom tiav. Nws tuaj yeem ua ntej nias thiab kub nias. Pre-pressing siab yog 0.2 mus rau 2 MPa, thiab nws yog nqa tawm nrog ib tug phaj xovxwm los yog ib tug roller xovxwm.