MDF Txheej Txheem

MDF txheej txheem

1, Tshuag

Thawj kauj ruam ntawm MDF cov txheej txheem ntau lawm yog kev npaj khoom. Cov khoom siv mas suav nrog chipper, siv conveyor, sifting tshuab, thoob of elevator, cia rau hauv, thiab lwm yam Hauv fiber pawg thawj coj ua khoom siv cov khoom siv yeej yog woodiness fiber raw khoom, nws suav nrog txoj hauv kev ntoo, twigs, hluav taws, kev ua cov seem, zoo tagnrho npaj cov khoom lag luam raw khoom yog rab koob nplooj cov khoom siv 60% ~ 70%, cov nplooj tsawb dav dav 30% ~ 40%, cov tawv ntoo tsis tshaj 5%.

2. Npaj cov fibers

Kev npaj fiber ntau yog cov fiber ntau sib cais, uas yog qhov tseem ceeb ntawm fiber ntau phaj cov txheej txheem. Cov cuab yeej siv rau kev sib cais fiber ntau suav nrog cov ntoo ua ntoo hauv (lossis preheating bin), lub plhaw me me, cua sov, cov roj paraffin melting thiab daim ntawv thov ntaus ntawv, sizing thiab ntsuas lub cuab yeej.

Cov kauj ruam ntawm kev sib cais fiber ntau:

A: Kub zeb. Cov txiag ntoo uas tsim nyog tau raug thauj mus rau cov ntoo chips rau hauv, thiab cov chips ntoo yog steamed, muag muag thiab thauj mus rau chav tsev zeb. Tom qab lub thermal mill compression ntawm cov ntoo chips, cov ntsiab lus noo ntawm qhov siab dua ntoo extrusion tawm hauv dej.

B: siv quav ciab. Cov roj av paraffin yog rhuab thiab melted los ntawm chav kauj. Cov yaj npliag txias ntawm cov roj nplaum qhuav ua rau cov ntoo ua ntej sib tsoo lub cev los ntawm cov yeeb nkab tso tawm. Tom qab tau sib cais ua ke rau hauv cov fibres, cov phiab paraffin tau faib tusyees ntawm lub fiber ntau.

C: sizing. Urea-formaldehyde resin nkag mus rau hauv ob chav ntsuas lub taub hau los ntawm cov lim thiab cov twj tso kua mis kua nplaum, thiab tom qab ntawd nkag mus rau hauv lub twj tso kua mis tso rau hauv cov yeeb nkab tawm kom loj qhov fiber. Cov fiber hauv cov yeeb yaj kiab tawm yog nyob rau hauv lub xeev kev kub ceev, thiab cov kua nplaum kua nplaum ua cov atomized thiab tusyees tsuag rau saum npoo ntawm lub fiber. Tus neeg sawv cev tua kab thiab cov neeg sawv cev tua kabmob (formaldehyde) tus neeg sawv cev tuaj yeem muab ntxiv rau roj roj tank rau cov khoom nplawm.

3, qhuav

Cov cuab yeej tseem ceeb rau kev ua kom qhuav ntawm cov fibreboard ntau lawm muaj lub tshuab ziab khaub ncaws, cov yeeb nkab qhuav, cua daj cua dub sib cais, fiber ntau cov khoom siv thiab cov khoom siv fiber ntau rau hauv. Cov pa hluav taws xob ntawm lub tshuab hluav taws kub nqus tau cov dej ntub ntawm cov yeeb nkab qhuav thiab kev sib tiv tauj tag nrho nrog cua kub. Cov paib tau tshem tawm hauv cov pa cua thiab raug thauj los ntawm kev nqus cua. Cov fiber ntau tso rau hauv cov pa xa pa rau 4 ~ 5 vib nas this kom nrawm nrawm ntawm qhov ua kom muaj fiber ntau thiab ncav cuag cov dej noo uas yuav tsum muaj (8% ~ 12%).

4, molding

Lub tsev khw moulding yog qhov tseem ceeb heev hauv nruab nrab ntom ntom fiberboard (MDF) cov txheej txheem ntau lawm txheej txheem, cov txheej txheem suav nrog cov kab kev pob zeb, kev thauj khoom ua ntej, ua ke cov ntu tseem ceeb, xws li ntug, hloov mus rau qhov yuav tsum tau ua ntawm cov txheej txheem surfacing: cov kab sib chaws sib luag thiab kev ruaj khov ntawm qhov ntom ntom nti, tuab, qhov nyhav ib ntu ntawm qhov chaw tswj kab kev tswj kav tas mus li ruaj khov thiab zoo ib yam, muaj qee yam ua kom nruj.

5, kub nias

Tam sim no, qhov kub nias tshuab ntawm nruab nrab ntom fiberboard hauv Suav teb yog sib quas ntuag ntau txheej kub nias tshuab.

A: kub xovxwm kub. Kev xaiv ntawm kub xovxwm kub feem ntau raws li hom thiab kev ua tiav ntawm pawg thawj coj, hom nplaum thiab qhov ntau lawm ntawm cov xovxwm los txiav txim. Kev xaiv ntawm qhov kub thiab txias feem ntau yog nyob ntawm cov khoom siv raw, hom ntoo, fiber ntau cov ntsiab lus noo, kev ua haujlwm nplaum, slab tuab, lub sijhawm ua cua sov, lub siab thiab cov khoom siv ua kom tiav.

B: thermal siab. Kev kub siab hauv cov txheej txheem ntawm qhov kub siab hloov pauv, lub siab maj mam nce ntxiv kom ua tau raws li qhov yuav tsum tau ua ntawm cov nplais ntog tuab, uas yog, lub siab yuav tsum tau txo, thiab cov solidification ntawm cov nplaum, qhov tsim ntawm ntau cov khi ntawm cov leeg, dej evaporation. feem ntau yog ua tiav hauv ntu ntu tsawg, lub siab ntsuas ntawm lub siab tsis tshua muaj siab feem ntau noj 0.6 ~ 1.3Mpa.

C: kub nias lub sijhawm. Qhov kev txiav txim siab ntawm kub nias lub sijhawm yog feem ntau cuam tshuam rau cov khoom thiab kho lub sijhawm ntawm cov kua nplaum, fiber ntau zoo, cov ntsiab lus noo ntawm cov nplais, tuab, kub thiab siab ntawm kub nias. Kub nias lub sijhawm feem ntau yog hais los ntawm lub sijhawm xav tau rau 1 hli phaj tuab.

D: ya raws cov ntsiab lus ntawm slab. Hauv cov txheej txheem kub nias, cov nyhuv ntawm cov dej noo sab hauv cov lus sib dhos yog kom muaj fiber ntau plasticity thiab thermal conductivity, yog li cov ntsiab lus tsim nyog ya raws kom zoo ntawm cov phaj, kev tswj dav hauv 10%, yog tias ntau dhau lawm yuav ua rau cov ntxhuav, tub ntxhais txheej ntom gradient nce, khi kev sib txawv sib txawv ntawm cov tub ntxhais txheej fiber ntau, cov kauj ruam ntawm cov pa luam yeeb ruaj khov, cov pa yog qhov nyuaj rau kev tshem tawm, cov txheej txheem intraplate bubbling, fawm kib, yog tias tsawg dhau yuav ua rau cov vaj huam sib luag, mos txheej txheej tuab, qhov txo qis ntawm lub zog ntawm phaj Cov.