Cov yeeb yaj kiab
vov tsev membrane
Lub vapor permeability ntawm vov tsev daim nyias nyias yog kuaj los ntawm ntau txoj kev nyob rau hauv tej yam kev kuaj mob xws li kub, siab thiab cua humidity. Nws yog qhov nyuaj kom tau txais cov xwm txheej zoo ib yam hauv cov kev tshawb fawb zoo li no, yog li cov txiaj ntsig tau muab rau hauv txoj kev no tsis muaj kev ntseeg siab. Vapor permeability feem ntau yog muab nyob rau hauv units ntawm g / m2 / hnub, uas txhais tau hais tias cov dej vapor hauv grams uas yuav dhau los ntawm ib square meter ntawm ntawv ci hauv ib hnub. Ib qho kev qhia tseeb ntawm cov vapor permeability ntawm cov ntawv ci yog qhov diffusion kuj coefficient Sd, qhia nyob rau hauv meters (nws sawv cev rau lub thickness sib npaug rau diffusion ntawm huab cua sib txawv). Yog tias Sd = 0,02 m, qhov no txhais tau hais tias cov khoom tsim kev tiv thaiv dej vapor tsim los ntawm 2 cm tuab huab cua txheej. Vapor permeability? Qhov no yog cov dej vapor uas cov vov tsev zaj duab xis (fleece, membrane) muaj peev xwm dhau los ntawm qee yam mob. Puas yog dej vapor nqa peev xwm siab ib txoj kev (tsis pom zoo rau lwm qhov)? Yog li ntawd nws yog ib qho tseem ceeb heev rau nteg cov ntawv ci rau ntawm lub ru tsev nrog rau sab xis, feem ntau nrog cov ntawv sau, kom cov dej vapor tuaj yeem nkag los ntawm sab hauv mus rau sab nraud. Roofing zaj duab xis kuj tseem hu ua zaj duab xis underlayment vim nws tuaj yeem hloov cov ntawv tar coated cladding. Lawv tau tsim los tiv thaiv lub ru tsev qauv thiab cov txheej txheem insulating los ntawm nag thiab daus los ntawm lub hau. Nws kuj tseem xav tias cov cua sov yuav tsis raug cua los ntawm cov txheej txheem thermal rwb thaiv tsev, yog li nws yuav tsum tau tiv thaiv los ntawm cua. Thiab thaum kawg? yog tshem tawm cov dej noo ntau dhau uas tuaj yeem nkag mus rau cov khaubncaws sab nraud povtseg ntawm lub ru tsev los ntawm sab hauv tsev (qhov no, koj yuav tsum nco ntsoov mus los ntawm qhov kev xav tias cov dej vapor yuav nkag mus rau hauv cov khaubncaws sab nraud povtseg vim muaj ntau yam xau). Qhov kawg ua haujlwm ntawm cov ntawv ci? nws vapor permeability? zoo li yog qhov tseem ceeb tshaj plaws thaum xaiv hom vov tsev zaj duab xis los ntawm ntau qhov chaw tsim khoom. Cov zaj duab xis yog suav tias yog cov pa permeable ntawm Sd <0,04 m (sib npaug rau ntau tshaj 1000 g / m2 / 24h ntawm 23 ° C thiab 85% txheeb ze av). Qhov me me Sd coefficient, qhov ntau dua qhov vapor permeability ntawm zaj duab xis. Raws li vapor permeability, pawg ntawm cov yeeb yaj kiab uas muaj tsawg, nruab nrab thiab siab vapor permeability yog qhov txawv. tsawg dua 100 g / m2 / 24 h? tsawg vapor permeability, mus txog 1000 g / m2 / 24h - nruab nrab vapor permeable; Sd coefficient yog 2-4 m; thaum siv lawv, nws yog ib qho tsim nyog yuav tsum muaj qhov sib txawv ntawm qhov cua ntawm 3-4 cm saum toj no lub rwb thaiv tsev kom tsis txhob ya raws. Cov yeeb yaj kiab uas muaj vapor permeability siab tuaj yeem tso ncaj qha rau ntawm rafters thiab tuaj rau hauv kev sib cuag nrog cov txheej txheej insulating. Qhov hnyav thiab tsis kam ntawm cov vov tsev rau cov hluav taws xob ultraviolet cuam tshuam rau cov khoom siv ntev. Qhov tuab ntawm cov ntawv ci, qhov ntau tiv taus rau kev puas tsuaj thiab kev puas tsuaj ntawm lub hnub ci hluav taws xob (xws li ultraviolet? UV). Cov yeeb yaj kiab uas siv ntau tshaj plaws yog 100, 115 g / m2 vim qhov pom qhov sib piv ntawm qhov hnyav rau txhua yam muaj zog thiab vapor permeability. Cov yeeb yaj kiab uas muaj vapor permeability siab tiv taus UV rays rau 3-5 lub hlis (nrog vapor permeability 3-4 lub lis piam). Xws li kev tiv thaiv nce ntxiv yog ua tiav vim stabilizers - additives rau cov khoom. Lawv raug ntxiv los tiv thaiv cov yeeb yaj kiab los ntawm cov kab hluav taws xob nkag los ntawm qhov khoob (los yog qhov) hauv txheej thaum ua haujlwm. Cov khoom siv ntxiv uas ua rau cov teeb meem tsis zoo ntawm lub hnub ci hluav taws xob yuav tsum muab ntau xyoo ntawm kev siv cov khoom siv, thiab tsis yuam cov neeg cog lus los kho cov vov tsev zaj duab xis ua cov vov tsev ib ntus rau ob peb lub hlis. Ib qho kev ntsuas ntawm cov dej tsis kam ntawm cov ntawv ci yog qhov ua haujlwm ntawm cov khoom siv rau qhov siab ntawm cov dej kem. Nws yuav tsum yog tsawg kawg yog 1500 hli H20 (raws li German tus qauv DIN 20811; nyob rau hauv teb chaws Poland, dej kuj tsis raug kuaj raws li ib tug qauv) thiab 4500 hli H20 (raws li lub npe hu. kinetic method). Puas yog pre-cover transparencies ua los ntawm yas? ua los ntawm polyethylene (nyuaj thiab mos), polypropylene, polyester thiab polyurethane, yog li lawv muaj zog thiab resistant rau deformation. Reinforced peb-txheej zaj duab xis yog feem ntau siv, uas muaj ib tug reinforcing txheej ntawm mesh ua los ntawm nruj polyethylene, polypropylene los yog fiberglass ntawm polyethylene. Ua tsaug rau qhov kev tsim no, lawv tsis raug deformation thaum lub sijhawm ua haujlwm thiab vim kev laus ntawm cov khoom siv. Cov yeeb yaj kiab nrog cov txheej txheem los tiv thaiv condensation muaj viscose-cellulose fiber ntawm ob txheej ntawm polyethylene, uas nqus dej ntau dhau thiab tso tawm maj mam. Cov yeeb yaj kiab tom kawg muaj qhov vapor permeability tsawg heev. Roofing membranes (cov ntaub ntawv tsis-woven) kuj muaj txheej txheej txheej. Cov txheej txheem tseem ceeb yog cov tsis-woven polypropylene npog nrog polyethylene lossis microporous polypropylene membrane, qee zaum ntxiv nrog polyethylene mesh.
