In order to meet specific requirements, especially in the sectors of furniture and industrial shutters, which use galvanised, pre-painted or plastic-coated steel profiles, it is advisable to use the techniques of seaming and clinching, which allow a closed metal profile to be obtained without welding in order to protect the coating in the joint area. These processes can be described in detail as follows:
- Seaming - This technique involves the joining of edges by means of a double fold, turned on itself and pressed dry, which is then stamped with grain or herringbone micro-incisions in order to create greater cohesion between the edges of the strip and obtain hermetically sealed metal profiles, protecting the joint area.
- Clinching - This method entails the joining of the edges of the strip, which are perfectly adjacent, with the aid of special equipment that compresses and draws one edge onto the other, enlarging the first inside the second, at a desired pressure proportional to the thickness of the strip itself, with a frequency defined by the need for variable tightness
- Continuous wire welding – This technique is only used for black or pickled metal profiles as the coating (galvanised, pre-painted, plastic-coated) would be compromised.
The main advantage of this solution is that is allows you to obtain metal profiles with elaborate shapes that are already punched and feature meticulous precision, offering savings in terms of time and money, and avoiding the need for retouching.