The forces in play

Once a fastening system is closed, it’s closed. Obviously. But we are talking about fastening systems that must be opened and closed. And these systems have particular forces – hold, opening, etc.

Let’s explain everything in order, otherwise it becomes complicated. You should know that to hang a painting, fix a panel to the ceiling, do up a sports jacket – just to give you some examples –very different forces are required. And here is the good part: a different fastener is needed depending on the force required.

mushroom fastenersRemember the mushroom systems we have talked about many times on this blog: well, when you hang a painting, horizontal sliding must be opposed and this force in English is called shearing.

In fact, from the photo it can easily be seen that the locking “mushrooms” on the fastener anchor into their counterpart, for example a velour tape, and oppose shearing.

magnified duotecIn the case of a panel to fix, the forces are at 90°, and called tensile forces in English; in this case the Duotec® single-component mushroom-mushroom fastener is without doubt the most suitable. The photo shows the “single-component”, that is, the fastener that engages with itself, like a snap fastener, which generates very high holding forces.

01_verschlussjackeFinally, in the case of the sports jacket, the problem is: how much force do I have to exert to open the fastener? This tensile force is called peeling force and must be commensurate with the number of opening/closing operations. Complicated? No, if you think how many times a hook and loop fasteners is opened and closed on a jacket… The best fastening system in this case is the hook and loop type, in particular the Binder Klettostar®, which is tested by performing up to 5,000 opening and closing cycles.

sport fastener

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