I. Product surface quality affects beauty
the quality of the surface of doors and windows will directly affect the overall installation effect. Therefore, when purchasing, attention should be paid to checking the quality of the surface of doors and windows from the following aspects:
1. There should be no obvious damage on the decorative surface of doors and windows, and there should be no scratch or scratch marks on the protective film on the surface of doors and windows.
2. There should be no obvious chromatic aberration on the colored surface of adjacent components on doors and windows.
3. There should be no aluminum chips, burrs, oil spots or other stains on the surface of doors and windows; There should be no overflowing adhesive at the assembly joint; There should be no too many nail holes exposed to the outside, affecting the appearance.
2. The smaller the product size deviation, the better
aluminum alloy doors and windows products will have a qualified range of dimensional deviation, and it is better to have smaller dimensional deviation. If it is out of range, it is a non-qualified product. For example, there is a standard regulation that the width and height of the slot of the door and window frame should be ≤ 2000mm, and the allowable deviation range is ± 1.0mm; The positive, the verticality of the side is ≤ 2000mm, and the allowable deviation range is ≤ 2.0mm.
Third, the material needs to meet the requirements of 5 aspects
aluminum alloy doors and windows products have five main requirements on materials:
1. Thickness: There are 75 Series, 88 series, 103 series and 120 series in aluminium alloy sliding door (the number of series indicates the millimeter of the thickness structure size of the door frame), and 88 series can be used for aluminium alloy sliding door inside the house. However, aluminium alloy sliding window has 50 series, 55 series, 70 series, 76 series, 118 series and 130 series, which should be determined according to the size of the window hole and the local wind pressure value. Among them, the aluminium alloy sliding window used for closed balconies should not be less than 55 series.
2. Strength: the tensile strength should reach 157 newton per square millimeter, and the yield strength should reach 108 newton per square millimeter. When purchasing, you can use your hand to bend the profile moderately, and the one that can be restored to its original state after letting go is a good product.
3. Flatness: when checking the surface of aluminum alloy profiles, there should be no depression or bulging.
4. Gloss: aluminum alloy doors and windows avoid choosing profiles with open bubbles (white dots), Ash (black dots), cracks, burrs, peeling and other obvious defects on the surface.
5. Oxidation degree: oxide film thickness should reach 10 micron. When purchasing, you can draw the profile surface lightly to see if the oxide film on the surface can be wiped off.
4. The components of aluminum alloy doors and windows are firmly connected
in terms of components, the components of aluminum alloy doors and windows should be firmly connected. High-quality aluminum alloy doors and windows components need to be sealed and waterproof with corrosion-resistant filling materials.
