Koj puas tau hnov ​​​​txog MDF? Qee tus neeg tsis paub meej tias nws yog dab tsi lossis siv nws li cas.

Medium-density fibreboard (MDF) yog ib qho khoom siv ntoo ua los ntawm kev rhuav tshem cov ntoo tawv ntoo los yog cov ntoo softwood residuals rau hauv cov ntoo fibers, feem ntau nyob rau hauv ib qho defibrator, sib txuas nrog cov quav ciab thiab cov khoom siv cob, thiab tsim cov vaj huam sib luag los ntawm kev siv qhov kub thiab txias. MDF feem ntau yog denser dua plywood. Nws yog tsim los ntawm cov fibers sib cais, tab sis tuaj yeem siv los ua cov khoom siv hauv tsev zoo sib xws hauv daim ntawv thov rau plywood. Nws muaj zog thiab ntau denser dua particle board.

Muaj ntau qhov kev xav tsis zoo txog MDF boards thiab feem ntau tsis meej pem nrog plywood thiab fiberboards. MDF board yog ib lub ntsiab lus rau nruab nrab ntom ntom fiberboard. Nws yog feem ntau suav hais tias yog cov ntoo hloov pauv thiab tab tom ua haujlwm dhau los ua cov khoom siv zoo nkauj rau cov khoom siv kho kom zoo nkauj nrog rau cov rooj tog hauv tsev.

Yog tias koj tsis paub MDF ntoo, peb yuav coj koj los ntawm nws yog dab tsi, kev txhawj xeeb nrog MDF ntoo, MDF boards ua li cas.

Khoom siv

MDF yog tsim los ntawm kev rhuav tshem ob qho tib si ntoo thiab ntoo mos rau hauv cov ntoo fibers, MDF feem ntau yog ua los ntawm 82% ntoo fiber, 9% urea-formaldehyde resin kua nplaum, 8% dej thiab 1% paraffin wax. thiab qhov ceev yog feem ntau ntawm 500 kg / m³(31 lb/ft³) thiab 1,000 kg / m³(62 lb/ft³). Qhov ntau ntawm qhov ntom ntom thiab kev faib raws liteeb,txheem, los yogsiabdensity board yog ib qho misnomer thiab tsis meej pem. Qhov ceev ntawm lub rooj tsavxwm, thaum ntsuas qhov sib txawv ntawm qhov ntom ntawm cov fiber ntau uas nkag mus rau hauv kev ua vaj huam sib luag, yog qhov tseem ceeb. Lub vaj huam sib luag tuab MDF ntawm qhov ceev ntawm 700-720 kg / m³Tej zaum yuav suav hais tias yog qhov siab ntom ntom nyob rau hauv cov ntaub ntawv ntawm softwood fiber ntau panels, hos ib lub vaj huam sib luag ntawm tib lub ntom ntom ntoo tsis suav hais tias yog li ntawd.

Fiber ntau lawm

Cov ntaub ntawv raw uas ua rau ib daim ntawm MDF yuav tsum dhau los ntawm cov txheej txheem ua ntej lawv tsim nyog. Cov hlau nplaum loj yog siv los tshem tawm cov khoom sib nqus, thiab cov khoom sib cais los ntawm qhov loj me. Tom qab ntawd cov ntaub ntawv yog compressed kom tshem tawm cov dej thiab muab tso rau hauv lub refiner, uas shreds lawv mus rau hauv me me pieces. Tom qab ntawd resin ntxiv los pab cov fibers daim ntawv cog lus. Qhov sib tov no yog muab tso rau hauv lub tshuab ziab khaub ncaws loj heev uas yog cua sov los ntawm cov roj lossis roj. Qhov kev sib xyaw qhuav no yog khiav los ntawm lub nruas compressor nruab nrog lub computer tswj kom lav qhov ceev thiab lub zog. Cov txiaj ntsig tau raug txiav mus rau qhov loj me nrog lub tshuab pom thaum lawv tseem sov.

Fibers tau ua tiav raws li tus kheej, tab sis tsis zoo, fibers thiab cov hlab ntsha, tsim los ntawm cov txheej txheem qhuav. Tom qab ntawd cov chips yog compacted rau hauv me me plugs siv ib tug ntsia hlau feeder, rhuab rau 30-120 vib nas this kom soften lignin nyob rau hauv ntoo, ces muab tso rau hauv ib tug defibrator. Ib tug raug defibrator muaj xws li ob counter-rotating discs nrog grooves nyob rau hauv lawv lub ntsej muag. Chips yog pub rau hauv nruab nrab thiab pub sab nraud ntawm cov discs los ntawm lub zog centrifugal. Qhov loj me me ntawm cov grooves maj mam cais cov fibers, pab los ntawm softened lignin ntawm lawv.

Los ntawm tus defibrator, lub pulp nkag mus rau 'blowline', ib feem ntawm MDF txheej txheem. Qhov no yog qhov nthuav dav cov kav dej, pib 40 hli hauv txoj kab uas hla, nce mus rau 1500 hli. Ciab yog txhaj rau hauv thawj theem, uas coats lub fibers thiab faib tusyees los ntawm turbulent txav ntawm cov fibers. Tom qab ntawd ib qho urea-formaldehyde resin yog txhaj ua tus neeg sawv cev tseem ceeb. Cov quav ciab txhim kho cov dej noo tsis kam thiab cov resin pib pab txo cov clumping. Cov khoom dries sai sai nyob rau hauv qhov kawg rhuab expansion chamber ntawm lub blowline thiab expands mus rau hauv ib tug nplua, fluffy thiab hnav fiber. Cov fiber ntau no tuaj yeem siv tam sim ntawd, lossis khaws cia.

Daim ntawv sau

Cov fiber qhuav tau nqus mus rau sab saum toj ntawm 'pendistor', uas sib npaug faib cov fiber ntau rau hauv ib lub lev hauv qab nws, feem ntau ntawm 230-610 mm thickness. Lub lev yog pre-compressed thiab xa ncaj qha mus rau ib tug nruam kub xovxwm los yog txiav mus rau hauv loj los xij rau ib tug multi-qhib kub xovxwm. Cov xovxwm kub activates cov khoom sib txuas thiab teeb tsa lub zog thiab ntom ntom profile. Lub voj voog nias ua haujlwm nyob rau theem, nrog rau cov lev tuab yog thawj zaug compressed rau ib ncig ntawm 1.5 × lub tiav board thickness, ces compressed ntxiv rau theem thiab tuav rau ib lub sij hawm luv luv. Qhov no muab cov rooj tsavxwm profile nrog cov aav ntawm nce ntom ntom, yog li cov neeg kho tshuab muaj zog, nyob ze ntawm ob lub ntsej muag thiab tus tseem ceeb tsis tshua muaj.

Tom qab nias, MDF yog txias rau hauv lub hnub qub tshuab ziab khaub ncaws los yog txias carousel, trimmed thiab sanded. Hauv qee qhov kev siv, cov laug cam kuj tau laminated rau lub zog ntxiv.

MDF txheej txheem ntau lawm