In terms of the slitting method of the slitting machine, square knife slitting is generally divided into two types: slotting slitting and suspended slitting:
1) Grooving and slitting means that when the material is running on the grooved roller, the cutting knife is dropped into the groove of the grooved roller to cut the material longitudinally. At this time, the material has a certain wrap angle on the grooved roller, which is not easy to drift. When slitting the cast PP film or the film with a narrow side material, this slitting method is often used to improve the slitting efficiency. But for suspended slitting, its disadvantage is that it is more troublesome to set the knife.
2) Hanging slitting means that when the material passes between the two rollers, the blade falls and cuts the material longitudinally. At this time, the material is in a relatively unstable state, so the slitting accuracy is slightly worse than that of die-cutting, but this The slitting method is convenient for knife setting and easy to operate. Square cutter slitting is mainly suitable for slitting very thin plastic film and composite film.
2. There are mainly two ways of round knife slitting: upper and lower disc knife cutting and round knife extrusion slitting.
Round knife slitting is the main slitting method for slitting thick film, composite thick film, paper and other materials. It is recommended to use a round knife for slitting if the film thickness of the slitting material is more than 100um.
Tangential slitting means that the material is cut from the tangential direction of the upper and lower disc knives. This kind of slitting is more convenient for knife alignment. The upper disc knife and the lower disc knife can be easily adjusted according to the cutting width requirements. Its disadvantage is that the material is easy to drift at the cutting place, so the accuracy is not high.
Non-tangential slitting means that the material and the lower disc knife have a certain wrap angle, and the lower disc knife falls to cut the material. This cutting method can make the material not easy to drift, and the cutting precision is high. But it is not very convenient to adjust the knife. When installing the lower disc knife, the whole shaft must be removed. Round knife slitting is suitable for slitting thicker composite films and papers.
2) The circular knife extrusion type slitter is not very common in the industry. It is mainly composed of a bottom roller that is synchronized with the material speed and has a certain wrap angle with the material, and a pneumatic slitting knife that is easy to adjust. This cutting method can not only cut thinner plastic films, but also cut thicker paper, non-woven fabrics, etc. It is a more convenient slitting method, and it is also a development direction of the slitting machine slitting method.
