Quality control of joined profile implies the measuring of geometry of profile and control of mechanical force between the profiles. Recommended value is 400-500 (N/cm). Standard polyamide strips are stable at high temperatures, which allows subsequent plastification /powder coating of profiles. On this line joining of raw and coated profile is possible, which enables connection of two-colored profiles. Furthermore, it is possible to connect different materials , such as combinations of aluminum-PVC-wood.