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The Slitting Form Of The Slitter Knife Includes Square Knife Slitting And Circular Knife Slitting
- Jul 25, 2018 -

Generally, the slitting form of the slitter knife includes square knife slitting and circular knife slitting.

1. The square knife is cut like a razor. The knife is fixed on the knife holder of the slitting machine. The knife is dropped during the running of the material, so that the knife cuts the material longitudinally to achieve the cutting purpose. Square slitter blades are mainly divided into single-sided knives and double-sided knives:

Single-sided inserts are better for thicker, stiffer and thicker slitting films, because the hard inserts are less prone to displacement at high speeds of the slitter, ensuring product quality. Single-sided inserts are recommended for thickness 70-130um.

The double-sided knife is softer and suitable for thinner material cutting, so that the flatness of the film edge is guaranteed, and the service life can be extended. The double-sided blade is recommended for thickness below 70um.

As far as the slitting method of the slitting machine is concerned, the square cutter slitting is generally divided into two types: slitting slitting and hanging slitting:

1) Cutting and slitting When the material is running on the sipe roller, the cutter is dropped into the groove of the sipe roller to cut the material longitudinally. At this time, the material has a certain wrap angle in the sipe roller, which is not easy to drift. When the PP film or the narrower edge film is slit and cut, the slitting method is often used to improve the slitting efficiency. However, for the hanging and slitting, its disadvantage is that it is troublesome to tool.

2) Suspended slitting is when the material passes between two rolls, the blade falls to cut the material longitudinally. At this time, the material is in a relatively unstable state, so the cutting accuracy is slightly worse than the cutting die, but this kind of cutting is slightly worse. The slitting method is convenient for the knife and easy to operate. The square cutter is mainly suitable for slitting thin plastic films and composite films.

2, Alloy circular knife cutting mainly has two methods: upper and lower disc cutter cutting and circular knife extrusion cutting.

Circular knife cutting is the main cutting method for slitting thick film, composite thick film, paper and other materials. It is recommended to use a circular knife to cut the thickness of the slitting material film above 100um.

The tangential slitting is the material cutting from the tangential direction of the upper and lower disc knives. This slitting is convenient for the knives. The upper disc knives and the lower disc knives can be easily adjusted to the position according to the slitting width requirement. Its disadvantage is that the material is easy to drift at the slit, so the accuracy is not high.

The non-tangential slitting is that the material and the lower disc cutter have a certain wrap angle, and the lower disc cutter falls to cut the material. This slitting method can make the material less prone to drift and high cutting precision. However, the adjustment of the knife is not very convenient. When the lower disc cutter is installed, the entire shaft must be removed. Round knife slitting is suitable for slitting thick composite membranes and paper sheets.

2) Circular knife extrusion slitting is not very common in the industry. It is mainly composed of a pneumatic slitting cutter that is synchronized with the material speed and has a certain angle of the bottom roller and easy adjustment. This slitting method can not only cut thin plastic films, but also cut thick papers, non-woven fabrics, and the like. It is a convenient cutting method and a development direction of the slitting machine.