• Cause: profile deformation can be divided into placement deformation, door and window deformation and profile chamber deformation. The placement deformation is mainly due to the existence of internal stress caused by inconsistent extrusion and cooling speed during profile production. The deformation of doors and windows is related to the design, manufacture, installation and profile of doors and windows. The deformation of profile chamber may be caused by formula reasons, no air pressure balance hole or unreasonable profile section design.
• Solution: For placement deformation, attention should be paid to avoid the profile in the sun exposure, and adjust the profile formula. For the deformation of doors and windows, it is necessary to optimize the design, production and installation process of doors and windows. For the deformation of the profile chamber, a more reasonable formula should be designed, effective air pressure balance holes should be set, and immature profile section design should be avoided.
