The doors and windows of the building are exposed to environmental effects, mainly wind pressure, rain and snow, and they must also withstand changes over time. Meanwhile, wind force is the main reason for the bending of window and door bars and rods (such as cross bars, vertical bars and windows), and the safety of doors and windows depends on their ability to withstand wind force. All these cases emphasize the importance of using galvanized reinforcing profiles in uPVC windows; Because it is galvanized that protects the UPVC profile and gives it strength. In case of not using galvanized reinforcement or using reinforcing profiles with non-standard thicknesses and dimensions, the doors and windows will not have acceptable quality and will not perform properly and will not be as safe as required. The addition of steel reinforcement or steel reinforcement in the cavity of PVC plastic profiles became common when the industry standard for steel doors and windows reinforced with polyvinyl chloride (JG/T131-2000) was announced and implemented in 2000, which required steel reinforcement in the UPVC profile. be installed
Reasons for using galvanized reinforcing profiles
The mechanical properties and durability of hard UPVC plastics are far less than steel and aluminum. To compensate for this shortcoming, the cross-sectional dimensions of the rigid PVC profiles that are used to make doors and windows are designed to be larger than steel and aluminum door and window profiles. And that is why they use galvanization to ensure the strength of UPVC profiles. Profile reinforcements, also known as galvanized, are made of steel with a “zinc” coating of appropriate thickness to prevent rust. other
Galvanized features:
Resistance to the pressure and force that the building imposes on the doors and windows, resistance to wind pressure and other weather factors on the windows, especially in tall buildings, resistance to expansion/contraction and changing the shape of the windows in the conditions Various climates strengthening and stabilizing the connection of the window to the building bear the pressure caused by the weight of the glass on UPVC profiles. UPVC profiles are defined as “windows produced by galvanized steel profiles with UPVC covers”.
Galvanized applications
All main parts of UPVC profiles used in windows should be reinforced with profiles. This includes window frames, door frames and window and door frames; No matter how long each piece of bar is, steel reinforcements must be installed as long as they are bolted together and hardware fittings are installed on their bars. Without steel reinforcement, self-tapping screws can only fix the hardware connections on the single pane of PVC profile, and the screws can be easily loosened, which will lower the performance of the window. Contact us to buy and inquire about the price of gold PVC profile.
Galvanized installation
The thickness of the galvanized steel sheets of reinforcing profiles is different according to the dimensions or height of the window installation. The galvanized length should be calculated according to the requirements of the door and window on the wind pressure resistance of the building. The dimensions of the reinforcing profiles should be in accordance with the dimensions and geometry of the uPVC profile and cover the entire unit.
The steel reinforcement installation locations are:
Profile reinforcement should be placed continuously along the sides of doors and windows. Other installation cases: (1) When the side length of the window frame is ≥ 1300 mm (50 series or more) and ≥ 1000 mm (50 series or less). (2) When the side window length is ≥1200mm (50 series or more) and ≥900mm (50 series). (3) When the length of the side sash of the sliding window is ≥1000mm (window thickness ≥45mm) and ≥900mm (window thickness ≥25mm). (4) When the lateral length of the lower part of the sliding sash is ≥ 700 mm, and the bearing housing does not support the gravity of the glass directly. (5) When the length of the profile (cross bars, vertical bars, etc.) is ≥900 mm.
Technical requirements of steel reinforcement
The surface of the steel reinforcement is hot-dip galvanized (12 micrometers). The minimum thickness of galvanized steel sheets for the production of reinforcing profiles should be 1.5 mm. In order for the steel reinforcement to resist rust removal or acid cleaning, instead of hot-dip galvanizing, two layers of anti-rust paint are applied. Steel reinforcement used for quality doors and windows should be coated with a layer of rust-proof paint after hot-dip galvanizing and cutting.
The need to use galvanized in the UPVC window
Length of steel reinforcement
After the processing and shaping of the steel reinforcement and surface treatment, its initial length is generally 6 meters, and it is also produced in 3 meters and 4.5 meters according to the length ordered by the door and window assembly factory. Deformation, rusting, shrinkage and expansion, etc. should be prevented in the packaging and transportation of steel reinforcements. Galvanized sections inside UPVC door and window profiles are one of the most important aspects of these doors and windows. So that based on the calculation of the loads applied to the window in the building, all the forces are applied to the galvanized sections and the UPVC profiles act only as a cover.