Basic Principles Of Plywood

Txhawm rau txhim kho cov khoom anisotropic ntawm ntuj ntoo kom ntau li ntau tau, kom cov khoom ntawm plywood zoo ib yam thiab cov duab ruaj khov, cov qauv plywood dav dav yuav tsum ua raws li ob lub hauv paus ntsiab lus: ib qho yog symmetry; Lwm qhov yog tias cov khaubncaws sab nraud povtseg ntawm veneer fibers yog perpendicular rau ib leeg. Lub hauv paus ntsiab lus ntawm symmetry yog tias cov veneers ntawm ob sab ntawm lub symmetrical centre dav hlau ntawm lub plywood yuav tsum sib haum mus rau txhua lwm yam tsis hais qhov xwm ntawm cov ntoo, lub thickness ntawm lub veneer, tus naj npawb ntawm txheej, cov kev taw qhia ntawm cov fibers, thiab cov dej noo. Nyob rau hauv tib lub plywood, veneers ntawm ib hom thiab tuab yuav siv tau, los yog veneers ntawm ntau hom thiab thicknesses yuav siv tau; Txawm li cas los xij, ob txheej txheej ntawm veneer uas sib luag rau ib leeg ntawm ob sab ntawm lub dav hlau symmetrical nruab nrab yuav tsum yog tib hom thiab tuab. Cov vaj huam sib luag pem hauv ntej thiab nraub qaum raug tso cai sib txawv ntawm tib hom ntoo.

Ua kom cov qauv ntawm plywood ua tau raws li cov ntsiab lus saum toj no ob lub hauv paus tib lub sijhawm, nws cov txheej txheem yuav tsum khib. Yog li ntawd, plywood feem ntau yog ua los ntawm peb txheej, tsib txheej, xya txheej thiab lwm yam khib nyiab. Cov npe ntawm txhua txheej ntawm plywood yog: lub veneer nto yog hu ua board nto, thiab sab hauv veneer hu ua core board; lub rooj tsavxwm pem hauv ntej yog hu ua lub rooj tsavxwm pem hauv ntej, thiab lub rooj tsavxwm sab nraub qaum yog hu ua lub rooj tsavxwm tom qab; nyob rau hauv lub core board, cov kev taw qhia fiber ntau yog parallel mus rau lub nto board yog hu ua ntev core board los yog nruab nrab board. Thaum tsim cov kab noj hniav slab, cov phaj pem hauv ntej thiab nram qab yuav tsum tau tig mus rau sab nraud.