I. Water leakage from the corners of the outer frame
There are two ways to connect the external frame of aluminium alloy in the market: 45 degree group angle and 90 degree straight thread fastening.
Causes of water leakage in the 45 degree group angle and the treatment plan:
1. The 45 degree angle is not correct or the saw blade is badly worn and badly balanced, resulting in gaps or concave defects when forming the 45 degree angle, thus causing water leakage; solution: improve the accuracy of the equipment and replace the saw blade frequently.
2. The clearance between the corner code and the frame profile is too large when forming the corner, resulting in looseness or gaps at the 45-degree splicing after the corner is completed, thus causing water leakage; treatment solution: the clearance between the corner code and the cavity of the profile is recommended to be controlled within 0.2mm, and the corner code is supported by additional reinforcement bars at the force point of the extrusion knife.
3. 45-degree section is not coated with sealant when the 45-degree angle is formed, resulting in water flowing directly into the cavity along the 45-degree section and penetrating into the wall; treatment solution: before forming the angle, sealant is coated on the 45-degree section, and it is good to have a certain extension and elasticity of sealant.
4. After the completion of the group angle is not injected into the cavity of the group angle sealant, resulting in the overall strength and sealing of the corner is not enough, there will be direct infiltration of water; treatment plan: after the completion of the group angle, the cavity at the group angle is injected into the seal before, good polyurethane two-component group angle adhesive, this adhesive is a two-component, in the drying process without absorbing water in the air, in the sealed environment will also dry, while the adhesive dries It is a hard adhesive, which increases the strength of the angle by 3 to 5 times, and the sealability is ideal.
5. The cavity of the heat insulation part of the profile is not treated, which causes water to enter the corner directly from the section and seep out; treatment solution: design a special connection in the cavity of the heat insulation rubber strip and adopt the glue injection seal.
6. At the large flange of the profile, (especially in the case of inward opening doors and windows), the connecting corner insert is not installed, and as there is no corner code here, there is a misalignment or gap, thus causing water leakage; treatment solution: design a corresponding connecting corner insert with a slot, and inject glue at the corner.
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