At China Aluminum Network, we ensure that the surface of metal doors and windows is clean, smooth, and free from any imperfections such as burrs. For steel doors and windows, there should be no welding slag, weld burrs, or hammer marks. The coating, color, galvanized layer, or anti-rust paint must be even, non-corrosive, and free from scratches or dents. Any product with issues like distortion, loose joints, surface damage, or attachment defects should be rejected. Additionally, the outer surfaces of metal and plastic door and window frames are covered with a protective film to preserve the finish. The material thickness used for metal doors, windows, their extensions, and handles must meet industry standards to ensure sufficient rigidity. The size of the sash should match exactly, with an overlap between the sash and frame of at least 2mm. The hinge positions must be accurate and consistent, with the upper and lower hinge axes aligned vertically. The gap on one side of the hinge should be between 0.6 to 1mm, and not exceed 2mm on the other side. The bottom of the window frame should be fully welded on both sides. Iron foot holes should not be long-round or round-shaped, and each window must have drainage holes at the lower frame. At the top, a water-drawing board should be installed at the waist window. The cross-section of aluminum alloy profiles used for windows and doors must comply with design specifications. Typically, the wall thickness should not be less than 1.4mm. For aluminum alloy doors, the profile wall thickness should be at least 2.0mm to ensure proper rigidity. Hardware components and accessories must adhere to relevant standards and design requirements, and it's recommended to use stainless steel, light metals, or other treated materials. The aluminum oxide film should meet at least AAl0 level standards, with a firm and durable coating. These quality control measures ensure that all products meet high-performance and aesthetic standards, providing customers with reliable and long-lasting solutions for their building needs. Automation Application Sensors Widely used in the field of industrial automation, such as automatic precision assembly, automatic grinding, automatic sorting device, automatic filling system, textile equipment tension monitoring, and torque torque. Zhejiang Nanhua Electronic Technology Co., Ltd , https://www.nhloadcell.com