Ntxiv nrog rau qhov loj me me, lwm yam kev ntsuas thiab kev ua haujlwm ntawm purlins kuj yuav tsum tau xav txog. Raws li cov ntaub ntawv sib txawv ntawm purlins, lawv cov kev txwv thiab kev ua tau zoo kuj txawv. Cov hauv qab no yog cov yam ntxwv ntawm purlin thiab kev ua haujlwm:
1. Ntoo purlins: muaj qee yam kev tiv thaiv corrosion thiab av qeeg, tab sis muaj kev cuam tshuam rau ya raws thiab deformation.
2. Aluminium alloy purlins: hnav, zoo nkauj, corrosion-resistant, tab sis kuj tsis tshua muaj zog thiab yooj yim tawg.
3. Steel purlins: muaj lub zog siab thiab ruaj khov, tab sis muaj ntau dua rau xeb.
