Kodi mwamvapo za MDF? Anthu ena sadziwa kuti ndi chiyani komanso momwe angagwiritsire ntchito.

Medium-density fibreboard (MDF) ndi matabwa opangidwa mwaluso opangidwa pothyola matabwa olimba kapena zotsalira za mitengo yofewa kukhala ulusi wamatabwa, nthawi zambiri mu defibrator, kuphatikiza phula ndi chomangira utomoni, ndikupanga mapanelo pogwiritsa ntchito kutentha kwambiri ndi kupanikizika. MDF nthawi zambiri imakhala yolimba kuposa plywood. Zimapangidwa ndi ulusi wolekanitsidwa, koma zitha kugwiritsidwa ntchito ngati zomangira zomwe zimafanana ndi plywood. Ndi yamphamvu komanso yowonda kwambiri kuposa particle board.

Pali malingaliro angapo olakwika okhudza matabwa a MDF ndipo nthawi zambiri amasokonezedwa ndi plywood ndi fiberboards. MDF board ndi chidule cha medium density fibreboard. Nthawi zambiri amaonedwa ngati choloweza m'malo mwa matabwa ndipo akutenga makampaniwa ngati chinthu chothandiza pazokongoletsera komanso mipando yapanyumba.

Ngati simukuzidziwa bwino za matabwa a MDF, tidzakutengerani momwe zilili, nkhawa ndi matabwa a MDF, Kodi matabwa a MDF amapangidwa bwanji.

Zakuthupi

MDF idapangidwa pothyola nkhuni zolimba ndi zofewa kukhala ulusi wamatabwa, MDF nthawi zambiri imakhala ndi 82% ya ulusi wamatabwa, 9% urea-formaldehyde resin guluu, 8% madzi ndi 1% sera ya parafini. ndipo kachulukidwe ake amakhala pakati pa 500 kg/m³(31 lb/ft³ndi 1,000 kg/m³(62 lb/ft³). Kusiyanasiyana kwa kachulukidwe ndi kugawa mongakuwala,muyezo, kapenaapamwambakachulukidwe bolodi ndi molakwika ndi zosokoneza. Kuchulukana kwa bolodi, poyesedwa pokhudzana ndi kuchuluka kwa ulusi womwe umapita popanga gululo, ndikofunikira. Gulu lakuda la MDF lokhala ndi kachulukidwe wa 700-720 kg/m³Zitha kuonedwa ngati kachulukidwe kakang'ono pankhani ya mapanelo a ulusi wa softwood, pomwe gulu la kachulukidwe komweko kopangidwa ndi ulusi wa matabwa olimba samawonedwa ngati choncho.

Kupanga CHIKWANGWANI

Zopangira zomwe zimapanga chidutswa cha MDF ziyenera kudutsa munjira inayake zisanakhale zoyenera. Maginito aakulu amagwiritsidwa ntchito kuchotsa zonyansa zilizonse za maginito, ndipo zipangizo zimasiyanitsidwa ndi kukula. Zinthuzo amazipanikiza kuti zichotse madzi kenako n’kuziika mu makina oyeretsera, amene amawang’amba kukhala tizidutswa ting’onoting’ono. Kenako utomoni umawonjezeredwa kuti ugwirizane ndi ulusi. Kusakaniza kumeneku kumayikidwa mu chowumitsira chachikulu kwambiri chomwe chimatenthedwa ndi gasi kapena mafuta. Kuphatikizika kowuma kumeneku kumayendetsedwa ndi drum kompresa yokhala ndi zowongolera zamakompyuta kuti zitsimikizire kachulukidwe ndi mphamvu yoyenera. Zidutswa zomwe zimatsatiridwazo zimadulidwa kukula koyenera ndi macheka a mafakitale akadali otentha.

Ulusi umakonzedwa ngati munthu payekha, koma osasunthika, ulusi ndi ziwiya, zopangidwa ndi njira youma. Ziphuphuzo zimaphatikizidwa kukhala mapulagi ang'onoang'ono pogwiritsa ntchito screw feeder, kutenthedwa kwa masekondi 30-120 kuti afewetse lignin mu nkhuni, kenako amadyetsedwa mu defibrator. Defibrator wamba imakhala ndi ma disc awiri ozungulira omwe ali ndi ma grooves kumaso awo. Chips amadyetsedwa pakati ndipo amadyetsedwa kunja pakati pa zimbale ndi mphamvu centrifugal. Kuchepa kwa kukula kwa grooves kumalekanitsa pang'onopang'ono ulusi, mothandizidwa ndi lignin yofewa pakati pawo.

Kuchokera pa defibrator, zamkati zimalowa 'mzere wowomba', gawo lapadera la ndondomeko ya MDF. Ili ndi payipi yozungulira yokulirakulira, yoyambira 40 mm m'mimba mwake, ikukwera mpaka 1500 mm. Sera imabayidwa mu gawo loyamba, lomwe limakwirira ulusi ndikugawidwa mofanana ndi kayendedwe ka chipwirikiti ka ulusi. Urea-formaldehyde utomoni ndiye amabayidwa ngati cholumikizira chachikulu. Sera imathandiza kuti chinyezi chisamavutike ndipo utomoni poyamba umathandizira kuchepetsa kugwa. Zinthuzo zimauma mwachangu m'chipinda chowonjezera chotenthetsera cha blowline ndikumakula kukhala ulusi wabwino, wopepuka komanso wopepuka. Ulusi uwu ukhoza kugwiritsidwa ntchito nthawi yomweyo, kapena kusungidwa.

Kupanga mapepala

Ulusi wouma umayamwa pamwamba pa 'pendistor', yomwe imagawira ulusi wofanana mu mphasa yofananira pansi pake, nthawi zambiri ya makulidwe a 230-610 mm. Makasitomala amapanikizidwa kale ndipo amatumizidwa molunjika ku makina osindikizira otentha osalekeza kapena kudula mapepala akuluakulu kuti apange makina osindikizira otentha ambiri. Makina osindikizira otentha amatsegula utomoni womangirira ndikuyika mphamvu ndi kachulukidwe mbiri. Kuponderezana kumagwira ntchito pang'onopang'ono, ndipo makulidwe a mphasa amayamba kukanikizidwa mpaka 1.5 × makulidwe a bolodi yomalizidwa, kenako amakanikizidwa pang'onopang'ono ndikusungidwa kwakanthawi kochepa. Izi zimapereka bolodi mbiri ndi madera a kuchuluka kachulukidwe, motero mawotchi mphamvu, pafupi ndi nkhope ziwiri za bolodi ndi zochepa wandiweyani pachimake.

Pambuyo kukanikiza, MDF imakhazikika mu chowumitsira nyenyezi kapena carousel yozizira, yokonzedwa ndi mchenga. M'zinthu zina, matabwa amapangidwanso laminated kuti apange mphamvu zowonjezera.

Njira yopanga MDF