How to choose the slitting machine blade is determined according to the type and thickness of the slitting material. Generally, the slitting form of the slitting machine blade includes square knife slitting and round knife slitting.

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

Single-sided blades are better when slitting thick films, because the hard blades are not prone to displacement when the slitter is high-speed. Single-sided blades are recommended for thicknesses between 70-130um.

Double-sided blades are softer and suitable for thinner materials. In this way, the flatness of the film edge is guaranteed, and the service life can be extended at the same time. Double-sided blades are recommended for thickness below 70um.

As far as the slitting method of the slitting machine is concerned, square knife slitting is generally divided into slot slitting and suspended slitting:

1) When the material is running on the grooved roller, the cutting knife is dropped into the groove of the grooved roller, and the material is cut longitudinally. At this time, the material has a certain wrap angle in the sipe roller, and it is not easy to drift.

2) Hanging slitting means that when the material passes between two rollers, 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 that of the die cutting. But this slitting method is convenient for knife setting and convenient for operation.

2. Round knife slitting mainly has two methods: upper and lower disc slitting and round knife squeezing slitting.

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

1) The upper and lower disc knife slitting methods are widely used, mainly including tangent slitting and non-tangential slitting.

Tangent cutting means that the material is cut in the tangential direction of the upper and lower disc cutters. This kind of slitting is more convenient for knife setting. The upper disc knife and the lower disc knife can be adjusted according to the cutting width requirements. Its disadvantage is that the material is easy to drift at the slitting position, 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, and the lower disc knife falls to cut the material. This cutting method can make the material less prone 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 entire shaft must be removed. Circular knife slitting is suitable for slitting thicker composite films and papers.

2) The application of circular knife extrusion slitting in the industry is not very common. 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 slitting method can slit relatively thin plastic films, as well as relatively thick paper, non-woven fabrics, etc. This is a more convenient way of slitting, and it is also a development direction of slitting machine slitting method.

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