There are materials that tend to fray with traditional slitting techniques. Nylon used for lining in the clothing industry for example. Hot slitting is the anwser to that problem and makes fraying a thing of the past.
For other materials where fraying is a concern, but warping by heat also
Some materials that are prone to fray are also sensitive for warping under heat. For those another technique is more suitable. Slittech also masters the advanced ultrasonic slitting technology.