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About the amount of overlap of plastic windows
The steel window frame and the window sash are sealed by overlapping, and the overlapping part of the fan and the frame is called a lap joint. Industry standards do not specify the amount of mashups. For the casement window, the amount of overlap is generally between 8~10mm. If the conditions permit, the overlap amount should be chosen as large as possible. In this way, the seal between the frame fans can be guaranteed even if the frame fan overlap position is slightly misaligned during installation and use.
The use of different hardware is also a factor that affects the amount of lap joints. If the ordinary handle is used, the overlap amount of the frame sash can be selected to be larger. If the transmission handle is used, a certain gap is required between the frame sash to install the actuator, so the lap amount is smaller, otherwise, it is installed on the fan. The actuator easily collides with the window frame and affects the opening and closing of the window sash. Therefore, even with the same profile, the amount of overlap should be determined separately. For instance, if the flat window is produced from 60 series plastic profiles produced by Dalian Shide Steel Group, the amount of lap joints of the casement windows without the actuator is set at 8mm. This is something that some companies have neglected.
For the sliding window, taking the continental profile of a commonly used fan frame as an example, the amount of overlap is determined by the sill of the window frame, the groove of the sash, and the size of the pulley. Usually, the ribs and grooves have the same size (there are ribs larger than the groove size), which is 20~22mm. The fan groove size minus the pulley height is the overlap between the fan and the lower frame. The height of the pulley is generally 12mm. The amount of overlap is 8~10mm. The industry standard requires that the overlap amount between the frame fans is even, then the overlap amount between the fan and the upper frame is also 8~10mm. The size of the sliding window overlap affects the sealing, safety and installation of the window. , daily use and so on. Taking a profile with a groove depth of 20mm as an example (the sliding window produced by Dalian Shide Group is the size), when a 12mm high pulley is used, the clearance between the ribs of the fan and the frame (ie the slide) is 12mm (20mm - 8mm = 12mm) ) This gap is for sash installation and removal. When installing the window, there is only 4mm installation clearance between the sash and the top of the ribs in the lower frame.
Due to dimensional deviations in the manufacture of window frames and sashes, deviations in the straightness of the window frame installation, and variations in the height of the used pulleys, will change the actual overlap and installation clearance of the frame fan. When the amount of overlap between the fan and the upper frame increases, the installation gap decreases. In severe cases, the window fan will be difficult to install, and the friction between the window and the upper sealing block will increase, causing the window fan to open and laboriously. When the upper overlap overlaps, the amount of overlap will decrease. The reduced sealing performance and too little overlap will increase the risk of the sliding window falling off. Therefore, when determining the overlap amount, it is necessary to pay attention to the dimensional change of the ribs, slot depths of the used plastic profile frame, and the matching of the size of the selected pulley and seal block. The formulation of door window frames, fan dimensional tolerances, and the production process specification should effectively control the amount of lap joints.
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