Most manufacturers of stretch film will be familiar with the phenomenon known as “edge burn”, a local hot zone with blurred film edges, appearing on the side of the roll when winding the freshly extruded film.
What happens?
The local pressure and heat during the winding cause distortion of the film edge, which makes the roll impossible for use when unwinding it. The film’s formula and its structure determine the probability of having to deal with edge burn.
Films with skin layers having high toughness and tacky character (mLLDPE) are prone to this problem and cause more friction with the blade during slitting.
What can we do?
You can make the slitting process more efficient: realizing straighter cutting edges by reducing friction and heat development between film and blade. In other words, the cooler the blade, the better. Our Fortisblades team knows how to ‘keep it cool’ with the right blade concept and can help manufacturers to reduce edge burn.
