A. Raws li cov txheej txheem kev kho deg sib txawv ntawm U-shaped iav, muaj ntau hom iav embossed, xim iav, thiab lwm yam hauv kev tsim thiab xaiv, ntxiv rau cov iav embossed, kev xaiv ntawm lwm cov iav yuav tsum tau sau tseg.
B. U-shaped iav yog ib yam khoom uas tsis yog combustible.Yog tias muaj cov kev cai tshwj xeeb, nws yuav tsum tau tsim raws li cov lus qhia tshwj xeeb.
C. U-hom iav cais:
Hais txog lub zog, muaj ob hom U-shaped iav: hom zoo tib yam thiab hom siv zog ntxiv nrog hlau lossis mesh.Cov hlau tshwj xeeb lossis hlau mesh tau nkag mus rau hauv cov kua iav ua ntej cov iav ua kua nkag mus rau hauv lub calender, thiab cov iav siv ntxiv los ntawm cov hlau los yog mesh yog tsim tom qab nias, thiab tom qab ntawd nkag mus rau U-shaped iav forming tshuab los tsim lub zog U- iav zoo li tus.
Los ntawm lub xeev nto, muaj ob hom U-shaped iav: zoo tib yam thiab qauv.U-shaped iav nrog cov qauv zoo tagnrho tuaj yeem tsim los ntawm calendering cov menyuam nrog cov qauv.
Raws li xim, muaj ob hom U-shaped iav: tsis muaj xim thiab xim, thiab cov xim muaj xws li lub cev xim thiab txheej.Muaj ntau hom xim xim, xws li txiv kab ntxwv, daj, daj daj, ntuj xiav, xiav, lub pov haum xiav, ntsuab thiab Wisteria[1]
D. U-shaped iav yog cov khoom uas tsis yog combustible.Yog tias muaj cov kev cai tshwj xeeb, nws yuav tsum tau tsim raws li cov lus qhia tshwj xeeb.
E. Kev ntsuas kev taw qhia ntawm ob lub tis ntawm lub iav U-shaped qhia tias lub zog ntawm ob lub tis nyob rau sab cua yog siab dua li ntawm sab leeward.
F. Raws li cov duab thiab lub tsev muaj nuj nqi, U-shaped iav txais cov kev sib xyaw ua ke hauv qab no:
G. Thaum qhov ntev ntawm U-shaped iav muab faib phab ntsa yog ntau tshaj 6000 thiab qhov siab yog ntau tshaj 4500, qhov ruaj khov ntawm phab ntsa yuav tsum tau kuaj xyuas thiab cov kev ntsuas sib thooj yuav tsum tau ua.
H. Thaum U-hom iav siv nyob rau hauv chav tsev nrog cov av noo thiab qhov kub thiab txias sib txawv ntawm sab hauv tsev thiab sab nraum zoov, qhov teeb meem ntawm cov kua dej thiab cov dej ntws tawm ntawm cov iav yuav tsum tau ua kom zoo.
1. Thaum U-shaped iav siv rau cov phab ntsa thiab lub ru tsev, lub vojvoog ntawm curvature yuav tsum tsis pub tsawg tshaj 1500.