The production process of aluminum-plastic co-extruded passive windows has a crucial impact on its product performance, and the following is a dissection of some key factors:

Profile extrusion process

Material selection: aluminum alloy material needs to have high strength and good corrosion resistance, such as 6063 - T5 aviation grade aluminum, can ensure the structural stability of the window. The plastic part usually adopts polymer composite micro-foamed polyvinyl chloride material (micro-foamed PVC), which has excellent thermal insulation performance and low thermal conductivity.

Co-extrusion process parameters: precise control of parameters such as temperature, pressure and extrusion speed is crucial. Too high or too low temperature may lead to the combination of plastic and aluminum alloy is not close, affecting the composite effect; uneven pressure will make the profile wall thickness is not consistent, reducing the overall performance of the product; extrusion speed is too fast may result in incomplete plastic coating or bubbles and other defects.

Cavity structure design

Multi-cavity design: the use of multi-cavity structure can form more air insulation layer, effectively preventing the transfer of heat, improve the thermal insulation performance of doors and windows. At the same time, the multi-cavity structure can also enhance the rigidity and stability of the profile, so that it has better wind pressure resistance.

Cavity shape optimization: Reasonably designed cavity shapes, such as shaped cavities or wave-shaped cavities, can increase the length of the air flow path and further enhance the thermal insulation effect. In addition, the optimized cavity shape can also make the force distribution more uniform when the doors and windows are subjected to external force, and improve the overall strength of the doors and windows.

Surface treatment process

Plastic surface treatment: forming a hard plastic layer of 0.5mm or more on the plastic surface not only ensures the hard and smooth appearance of the profile, but also improves its weather resistance and scratch resistance. At the same time, the use of special surface treatment technology, such as nano-coating technology or self-cleaning coating technology, can make the surface of doors and windows with better dirt resistance and self-cleaning ability.

Aluminum alloy surface treatment: the surface of aluminum alloy is usually treated with fluorocarbon spraying, powder coating and other processes to improve its corrosion resistance and decorative properties. High-quality surface treatment can make the doors and windows less prone to fading, discoloration and other problems during long-term use, and it can also enhance the bonding force between aluminum alloy and plastic.

Corner connection process

Welding and corner code connection: the corner connection of aluminum-plastic co-extruded passive window generally adopts the combination of welding and corner code connection. The external foam plastic part forms a solid connection through welding, and the internal aluminum profile part is fixed by the corner code, which is connected by three-point reinforcement, and this connection can ensure the strength and sealing of the corners of the windows and doors, and effectively prevent the corners from cracking and leaking.

Corner injection process: In the corner connection process, the corner injection process can further improve the corner connection strength and sealing. By injecting high-strength glue into the corners, it can fill the gaps in the corners, enhance the integrity of the corners, and at the same time improve the wind pressure resistance and watertightness of the doors and windows.

Sealing process

Selection of sealing tape: passive windows should use three sealing tape with good durability, such as soft and hard co-extruded EPDM (EPDM) automotive-grade composite foam tape, which has good toughness to resist temperature difference, anti-aging and deformation, and can effectively improve the air-tightness and water-tightness of the doors and windows. The opening fan all-encompassing sealing rubber strip adopts seamless welding process, complete without disconnection, which can further enhance the sealing effect.

Sealing structure design: Reasonable sealing structure design is also a key factor affecting the sealing performance of doors and windows. For example, using the principle of equal pressure cavity design sealing structure, can make the doors and windows in the internal and external pressure difference, the sealing tape can be better adhered to the door and window frames and fans, so as to improve the sealing performance.

Glass installation process

Glass selection: passive windows usually adopt three-glass insulating glass, such as 5MM + 16A + 5MM + 16A + 5MM configuration, standard with automotive-grade float tempered glass, which can be upgraded to low-e low-e glass and filled with argon gas to improve the thermal insulation effect of the glass and light transmittance.

Glass installation method: professional installation process should be adopted between glass and door/window frames, such as using sealant or sealing tape for sealing, to ensure that the glass is firmly installed and well sealed. At the same time, in the process of glass installation, attention should be paid to avoid direct contact between the glass and the door and window frames to prevent thermal bridging, which affects the thermal insulation performance of doors and windows.