plywood yog dab tsi?
Txheem
Plywood boards los yog "cov ntawv" muaj peb los yog ntau dua nyias txheej ntawm ntuj ntoo glued ua ke.
Cov khaubncaws sab nraud povtseg yog hu ua "layers", li no lub npe "plywood". Raws li txoj cai, lub thicker lub plywood, ntau txheej nws muaj.
Nws yog cov khoom siv ntau yam nrog ntau yam kev siv, los ntawm cov phab ntsa thiab hauv pem teb npog mus rau pob zeb ua pwm, tsim rooj tog thiab ntim khoom.
Plywood muaj zog dua li lwm cov ntaub ntawv ntoo xws li nruab nrab ntom ntom fiberboard (MDF).
Saib peb nplooj ntawv MDF yog dab tsi?, yog xav paub ntxiv txog Medium Density Fiberboard.
Lub zog ntawm plywood yog vim qhov tseeb tias cov kev taw qhia ntawm cov fibers ntawm txhua txheej alternates nrog rau cov txheej uas nyob ib sab.
Kev sib hloov ntawm cov qoob loo ntawm txhua txheej, hu ua hla nplej, feem ntau yog 90 degrees (txoj cai kaum). Qhov no txhais tau hais tias cov nplej ntawm txhua txheej yog taw qhia tib yam, thiab txheej yog taw qhia ntawm 90 degree kaum sab xis ntawm lawv. Txawm li cas los xij, lub kaum sab xis ntawm kev sib hloov tuaj yeem qis li 30 degrees. Nyob rau hauv ib co thicker plywoods, xya txheej yuav tsum tau teem nyob rau hauv ib theem ntawm cov ces kaum ntawm 0, 30, 60, 90, 120, 150, thiab 180 degrees).
Rotating grain muaj ntau qhov zoo. Qhov no:
Txo txoj hauv kev sib cais thaum cov nplooj ntawv raug ntsia rau ntawm ntug
Txo expansion thiab shrinkage kom zoo dua dimension stability
Muab plywood ib lub zog zoo ib yam nyob rau hauv tag nrho cov lus qhia thoob plaws hauv lub rooj tsavxwm.
Keeb kwm ntawm Plywood
Ancient tim lyiv teb chaws
Cov khoom ntoo ua nyob rau hauv Egypt thaum ub nyob ib ncig ntawm 3500 BC yog cov piv txwv ntxov tshaj plaws ntawm kev siv plywood. Lawv tau ua los ntawm sawn veneer glued crosswise, zoo li niaj hnub plywood.
Tuam Tshoj, Askiv thiab Fabkis
Kwv yees li 1,000 xyoo dhau los, Suav tau npaj ntoo thiab muab nws los ua rooj tog.
Cov neeg Askiv thiab Fabkis tau tsim cov vaj huam sib luag los ntawm plywood nyob rau hauv lub xyoo pua 17th thiab 18th.
Los ntawm tsev mus rau kev tsim kho
Cov piv txwv thaum ntxov ntawm plywood, feem ntau yog ua los ntawm cov ntoo zoo nkauj, feem ntau yog siv los tsim cov khoom siv hauv tsev xws li cov txee, hauv siab, cov txee, thiab qhov rooj.
Softwood plywood rau siv nyob rau hauv kev tsim kho tau tshwm sim nyob rau hauv lub xyoo pua 20th.
Nws siv rau dab tsi?
Muaj ntau yam kev siv
Qhov ntau ntawm kev siv plywood, ob qho tib si sab hauv tsev thiab sab nraum zoov, zoo li tsis muaj qhov kawg. Hauv kev tsim kho, nws tuaj yeem siv rau hauv phab ntsa, pem teb, ru tsev thiab ntaiv; raws li ib tug formwork (hom daim ntawv) tuav pob zeb thaum lub sij hawm teem; thiab nyob rau hauv ib ntus thav duab rau shaping rau nteg cib los yog pob zeb thaum npaj arched qhib.
Rooj tog
Plywood kuj tseem siv dav hauv kev tsim rooj tog.
Ntim, qauv thiab kos duab nto
Lwm daim ntawv thov suav nrog kev ntim khoom ruaj ntseg, cov khoom ua si thiab cov khoom ua si, thiab txawm tias lub cev ntawm qee lub tsheb thiab lub dav hlau.
Nyias plywood feem ntau yog siv los ua qauv, thiab qee cov kws kos duab pleev xim rau nws tom qab txheej nws nrog plaster, lub sealant uas muab ib qho me ntsis ntxhib nto uas tuav cov xim zoo.
Tsim los rau Lub Hom Phiaj Tshwj Xeeb
Ntau hom plywood yog tsim los rau cov hom phiaj tshwj xeeb. Piv txwv li, plywood siab zog ua los ntawm mahogany thiab / los yog birch tau siv nyob rau hauv kev tsim kho ntawm ib co ntiaj teb no ua tsov ua rog II aircraft, thaum marine plywood ua los ntawm lub ntsej muag muaj zog thiab sab hauv veneers nrog ob peb yam tsis xws luag ua tau zoo nyob rau hauv ntub thiab ntub dej.
Nta
Kev quab yuam
Plywood muaj zog, feem ntau haum rau kev puas tsuaj, kuj lub teeb, thiab kuj yooj yim txiav thiab "ua hauj lwm" nrog cov cuab yeej.
Nws yog qhov zoo tshaj plaws los ua cov ntaub ntawv rau kev tsim lossis npog loj, tiaj tus, nqes hav lossis txawm tias cov duab xws li phab ntsa, pem teb, qee hom ru tsev thiab cov thawv loj.
Siv tau rau kev ua haujlwm nyuaj
Qee hom plywood yog tsim rau kev ua haujlwm nyuaj, xws li kev ua qauv, cov khoom siv ntoo, thiab cov thawv me me.
Cov vaj huam sib luag loj sai npog thaj chaw loj
Vim hais tias plywood muaj nyob rau hauv cov vaj huam sib luag loj, cov cheeb tsam loj tuaj yeem them nrog cov ntug me me sib koom ua ke, thiab qhov kev xaiv dav ntawm cov thicknesses ua rau nws haum rau ntau yam kev siv los ntawm cov txee tuab rau nyias cladding.
Yuav ua li cas plywood?
Kev tsim cov plywood feem ntau xav tau cov cav hu ua "hullers" uas loj dua hauv txoj kab uas hla thiab ncaj dua li qhov nruab nrab ntawm cov ntoo txiav.
Cov tawv ntoo raug muab tshem tawm ua ntej lub tshuab ziab khaub ncaws yog rhuab thiab soaked rau 12 mus rau 40 teev ua ntej slicing.
Tom qab ntawd nws muab tso rau hauv lub tshuab tev loj thiab tig ib ncig ntawm nws txoj kab ntev ...
… thaum ib daim ntawv ntev cais ib daim ntawv txuas ntxiv lossis txheej ntawm lub cav. 
Daim ntawv ntev yog txiav mus rau hauv qhov chaw ntawm qhov ntev thiab qhov dav, thiab qhov chaw raug tshuaj xyuas qhov tsis xws luag. 
Cov khaubncaws sab nraud povtseg yog tom qab ntawd nias thiab nplaum ua ke, thiab cov boards raug txiav mus rau lawv qhov ntev kawg.
Kev ua haujlwm kawg yog feem ntau sib tsoo - leveling - boards. Qee cov laug cam yog coated (xws li melamine lossis acrylic) thiab lawv cov npoo raug kaw.
Dab tsi yog hom plywood?
Qhov ntau ntawm plywood yog loj heev. Hauv qab no yog qee yam ntawm cov hom tseem ceeb muaj. Tham nrog koj tus neeg tsim khoom muag lossis saib hauv online yog tias koj tab tom nrhiav qee yam tshwj xeeb kom tau raws li qhov xav tau tshwj xeeb.
Coniferous plywood
Qhov no yog hom plywood feem ntau siv hauv kev tsim kho thiab kev lag luam.
Hardwood plywood
Hom no muaj ntau lub zog thiab rigidity. Nws tiv thaiv kev puas tsuaj thiab hnav ua rau nws haum rau qhov hnyav ib puag ncig nrog rau hauv pem teb thiab phab ntsa.
tropical plywood
Ua los ntawm cov neeg Esxias, African thiab South American tropical ntoo, cov plywood no ua tau zoo dua cov ntoo plywood vim nws muaj zog thiab flatness ntawm plies. Nws yog qhov kev xaiv zoo tshaj plaws ntawm ntau yam hauv kev tsim kho kev lag luam. Qee cov qauv muaj qhov zoo nkauj zoo nkauj thiab xim, ua rau lawv haum rau siv hauv qee hom rooj tog.
Aviation plywood
Ua los ntawm mahogany los yog birch, thiab feem ntau ob qho tib si, lub siab-lub zog plywood muaj plies glued ua ke nrog ib tug nplaum uas yog heev resistant rau tshav kub thiab ya raws. Nws tau siv rau qee lub dav hlau thaum Tsov Rog Ntiaj Teb Zaum II thiab niaj hnub no siv ntau yam kev siv uas xav tau lub zog zoo sib xws thiab kav ntev.
Kho kom zoo nkauj plywood
Cov plywood no muaj cov txheej txheem zoo nkauj zoo nkauj rau siv hauv rooj tog, phab ntsa thiab lwm yam "zoo" daim ntaub ntawv. Lwm hom hniav txheej txheej muaj xws li pwm thiab resin impregnated ntawv.
hloov tau plywood
Cov plywood yooj yim, qee zaum hu ua "lub kaus mom plywood" vim nws siv hauv "chimney" kaus mom hauv Victorian lub sijhawm, tau siv los tsim cov duab nkhaus.
marine plywood
Marine plywood, raws li nws lub npe qhia, yog qhov kev xaiv rau lub nkoj thiab ntau lwm yam kev siv uas ntub dej thiab ntub dej. Nws yog resistant rau fungal nres thiab delamination - thaum cov khaubncaws sab nraud povtseg pib delaminate, feem ntau yog vim raug dampness. Qhov tsis zoo yog tias nws kim dua li ntau lwm hom plywood.
Fireproof plywood
Qhov no yog plywood kho nrog tshuaj kom muaj zog tiv thaiv hluav taws.
Plywood laminated nrog phenol
Kub laminate yog melted rau saum npoo ntawm no plywood. Qhov saum npoo tuaj yeem ua rau sab laug rau kev ua haujlwm - piv txwv li, pwm rau cov pob zeb ua vaj tse lossis cov qauv ib ntus los tuav cov cib arches thiab lwm yam ntaub ntawv nyob rau hauv qhov chaw kom txog rau thaum lub mortar teeb - lossis cov qauv tuaj yeem nias rau hauv nws kom tsis txhob plam lossis zoo nkauj. ua kom tiav. Daim ntawv thov.
Qhov ntau thiab tsawg yog muaj?
Qhov siab tshaj plaws thiab qhov tsawg kawg nkaus ntawm daim ntawv feem ntau nyob ntawm seb hom plywood, tab sis feem ntau tus qauv loj yog 4ft los ntawm 8ft (1220mm x 2440mm). Cov ntawv loj dua thiab me dua feem ntau muaj, feem ntau hauv 1 ko taw (300 mm) nce ntxiv.
Plywood thickness txawv ntawm 1/16 "(1.4mm) mus rau 1" (25mm), txawm hais tias cov ntawv tuab yog muaj rau qee cov ntawv tshwj xeeb.
Yuav ua li cas plywood sorted?
Ntau hom plywood tau muab faib ua qhov sib txawv, nyob ntawm seb hom ntoo uas lawv tau ua los ntawm lossis lub teb chaws ntawm keeb kwm. Kev ntsuam xyuas yog hais txog qhov zoo ntawm cov ntoo siv, txawm tias ib qho los yog ob qho tib si txheej txheej los yog qhov chaw muaj tsawg heev los yog ntau yam tsis xws luag, thiab seb puas muaj qhov tsis xws luag tau raug tshem tawm thaum lub sij hawm tsim khoom.
Piv txwv li, hom ntawm birch plywood:
S chav kawm (siab tshaj) - tsuas yog cov khoom me me thiab cov yam ntxwv
Qib BB (nruab nrab) - ntxig oval thaj ua rau thaj hloov cov pob qhov loj thiab qhov tsis xws luag.
Qib WG (qis) - qhib qhov tsis xws luag ntawm cov pob me me nrog qee qhov kho cov pob loj dua.
Chav Kawm C (qis tshaj) - qhib qhov tsis xws luag tso cai
Tseem muaj Brazilian, Chilean, Finnish, Lavxias teb sab, Swedish thiab ntau lwm yam. Ua ntej yuav khoom, xyuas cov qib plywood kom paub tseeb tias cov plywood ua tau raws li qhov yuav tsum tau ua rau txoj haujlwm tshwj xeeb.
Dab tsi yog cov qauv rau plywood?
Muaj cov qauv sib txawv - European thiab BS (British Standards) - rau plywood siv ntau yam kev siv.
Piv txwv li, nyob rau hauv kev tsim kho sector, European txheem rau ntoo-raws li panels EN 13986 yuav tsum tau plywood siv nyob rau hauv kev tsim kho sector kom tau raws li ib tug ntawm peb chav kawm ntawv nyob rau hauv EN 636, thiab cov neeg muag khoom yuav tsum muab pov thawj ntawm qhov no.
Cov chav kawm ua tau zoo yog ua raws li cov dej noo tiv thaiv ntawm plywood siv nyob rau hauv ntau qhov chaw ntawm lub tsev xws li lub ru tsev, partitions, pem teb, thiab ntoo-framed sab nrauv phab ntsa.
Qee hom sib xyaw ua ke zoo heev huab cua tiv thaiv thiab sab nraum zoov lub zog kom ua tau raws li cov qauv tshwj xeeb xws li BS 1088 (plywood rau marine siv), thaum tus qauv txheej txheem BS 5268-2: 2002 siv rau plywood lub zog, siv hauv kev tsim kho. Nws yog ib lub tswv yim zoo los xyuas seb cov plywood koj yuav yog tus qauv raug rau kev siv.
