At the same time as used for outside roofing, the first-class of china aluminum roofing sheet should be surprisingly required. The expert processing of aluminum roofing sheet is the primary key factor to make certain long time the usage of period. The classification of aluminum roofing sheet is mainly in keeping with the floor treatment. The outer surface treatment of aluminium roofing sheet includes herbal non-painted products and painted merchandise.
1,Non-painted products: hammer-formed aluminum sheet alloy (abnormal pattern), embossed aluminum sheet alloy (thru bodily mechanical embossing to shape everyday sample); pre-passivating anodized aluminum sheet. Such products are not painted on the surface, and the advent requirement of the surface is not high and the price is low.2, painting merchandise: consistent with the coating process, it is divided into: spraying merchandise and pre-roll coating. In step with the form of paint, it could be divided into: polyester, polyurethane, polyamide, changed silicone, epoxy resin, fluorocarbon, and so forth., the motive of portray at the floor of aluminum roofing sheet is to extend the getting old of the paint towards the ultraviolet rays of sunlight so long as possible, for the duration of the coated fabric, the PVDF (Fluorocarbon coating) has the satisfactory anti-getting older residences, and it's far the maximum powerful organic compound. The fluorocarbon lined aluminum roofing sheet is made from horizontal automatic two-coating two-bake, 3-coating 3-bake and 4-coat 4-bake roll coating methods in step with unique excellent necessities. The pre-lined PVDF coating has a resin content material of 70%-eighty%. It is covered at the excessive-velocity continuous unit through chemical pretreatment, preliminary coating, first-class coating, etc. The front coating is generally 25μm, and the anti-corrosive paint is applied again.
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