Three slitting methods of slitting machine

In the slitting process, it can be roughly divided into three methods: flat knife slitting, round knife slitting, and extrusion slitting.

Flat knife slitting

Just like a razor, a single-sided blade or a double-sided blade is fixed on a fixed knife holder, and the knife is dropped during the material operation, so that the knife cuts the material longitudinally to achieve the purpose of slitting.

There are two ways to cut the razor:

One is slitting and slitting; the other is dangling slitting.

Groove slitting is when the material runs on the grooving roller, the cutting knife falls in the groove of the grooving roller, and the material is cut longitudinally. At this time, the material has a certain wrap angle in the grooving roller, and drifting phenomenon is not easy to occur. When slitting the cast PP film or the film with narrow edge material, this slitting method is commonly used to improve the slitting efficiency. However, its disadvantage is that it is inconvenient to adjust the knife.

Hanging slitting is when the material passes between the two rollers, the razor falls to cut the material longitudinally, at this time the material is in a relatively unstable state, so the slitting accuracy is slightly worse than the die slitting, but this slitting The tool setting is convenient, and the operation is convenient. Flat cutter cutting is mainly suitable for cutting very thin plastic films and composite films.

Round knife slitting

Circular knife slitting can be divided into tangent slitting and non-tangent slitting.

The tangent cutting is to cut the material from the tangential direction of the upper and lower disc cutters. This kind of slitting is relatively convenient. The upper disc cutter and the lower disc cutter can easily adjust the position directly according to the slitting width requirements. Its disadvantage is that the material is easy to drift at the slit, so the accuracy is not high, and it is generally not used now.

Non-tangential slitting means that the material and the lower disc knife have a certain wrap angle. The lower disc knife falls and cuts the material. This cutting method can make the material not easy to drift, and the cutting accuracy is high. But the knife adjustment is not very convenient. When installing the lower disc cutter, the entire shaft must be removed. Circular knife slitting is suitable for slitting thicker composite films and paper.

Slitting

Extrusion slitting is not common on domestic slitting machines. It is mainly composed of a bottom roller that is synchronized with the speed of the material and has a certain angle with the material, and a pneumatic knife that is easy to adjust. This slitting method can slit thinner plastic films, thicker paper and non-woven fabrics. It is a more convenient way of cutting. It is a development direction of slitting method of slitting machine.