Why does anodized aluminum cannot be used in aluminum curtain wall?
aluhm > 12-26-2017, 02:36 AM
Aluminum sheet, as the name suggests, refers to the material made of aluminum or aluminum alloy material. Or is the type of aluminum products by flat aluminum embryo through heating, rolling and straightening or solution and aging process made.
Aluminum building used include monolayer sheet, composite aluminum and other materials, usually often refers to aluminium (also called the single pure aluminum or aluminum), used for building decoration engineering, in recent years in the use of aluminum single aluminum sheet curtain wall is more common. Aluminum sheet curtain wall is also a form of curtain wall. In brief, it is made of aluminum sheet instead of glass, and aluminum curtain wall is used as wall protection and lighting wall. Such as the world trade center in Guangzhou, with the aluminium processing factory factory processing sheet in different sheet radian of nearly one hundred and fifty tons, the surface of the electrostatic spray. Single layer aluminum sheet has been used in foreign aluminum curtain wall. Single aluminium sheet is usually made of pure aluminium sheet. sheet thickness is 3mm, in order to strengthen the strength of aluminum sheet, aluminum sheet in the back, must reinforcement installation (existing manufacturers uneasy), reinforcing ribs made of thick aluminum strip, first with a screw cap to flash butt welding in aluminum back and then made reinforced aluminum strip drilling into the screw. Fixed by screws.
In order to lighten the weight of aluminum sheet and increase the strength of aluminium sheet, we use aluminium alloy sheet, often use No. 21 antirust aluminium, code No. LF21 pressed aluminum sheet as curtain wall aluminium sheet. The thickness of the aluminum sheet is reduced from 3mm to 2.5mm, and the strength of the alloy is about twice higher than that of the pure aluminum sheet. The reinforcing ribs are made of LF21 aluminium strip, and the width and thickness of the aluminium strip are determined according to the surface of the aluminum sheet. The thickness of the aluminum strip is generally 2-2.5mm and 10-25mm wide. Why should the back of aluminum curtain wall sheet Angus reinforcing bar in the outside world is positive and negative pressure, a sheet will not sag, not two bulge vibration sound so as to avoid the repeated vibration and aluminum curtain wall inside and outside a. If sound insulation is necessary, place rock wool, slag wool or foam on the inside of the aluminum sheet. The first domestic production of aluminum curtain wall aluminum factory, deep processing factory in Chongqing factory for the SWA, military manufacturers, production of aluminum sheet width can reach 2.8 meters. Curtain wall aluminum sheet surface treatment can be divided into two methods, one is anodic oxidation, and the other is electrostatic spraying. Anodic oxidation film in general more than 12 mu, only the bronze color and white two colors, monotonous, more serious shortcoming is the color depth of each aluminum sheet curtain wall , many blocks are combined together to form the overall effect of a curtain wall is very ugly. This drawback can be said that can not be eliminated, is not caused by the production technology, but because of aluminum is not by a lot, the chemical composition, have small differences, coupled with the oxidation of factors of electrolysis bath and current density are not exactly the same, so the number of oxidized color difference, single look may not be obvious, if together is very obvious. Therefore, the aluminum curtain wall aluminum sheet surface treatment must not be anodized.