The cutting methods of slitter blades include razor blade cutting and circular blade cutting.
Generally, the cutting methods of slitter blades include razor blade cutting and circular blade cutting.
1. Razor blade cutting involves fixing the blade onto the blade holder of the slitter, similar to a razor. During material operation, the blade is lowered to longitudinally cut the material, achieving the purpose of slitting. Razor blades are mainly divided into single-sided blades and double-sided blades:
- Single-sided blades are more suitable for cutting thicker and more rigid materials, such as thick films, as they are less prone to displacement during high-speed slitting, ensuring product quality. For thicknesses of 70–130 μm, single-sided blades are recommended.
- Double-sided blades are relatively softer and more suitable for cutting thinner materials, ensuring smooth edges and extending service life. For thicknesses below 70 μm, double-sided blades are recommended.
In terms of slitting methods, razor blade cutting is generally divided into grooved cutting and suspended cutting:
1) Grooved cutting involves the material running over a grooved roller, with the blade lowered into the groove of the roller to longitudinally cut the material. At this point, the material has a certain wrap angle on the grooved roller, reducing the likelihood of drifting. This method is commonly used when slitting cast PP films or narrow-edged films, as it improves slitting efficiency. However, compared to suspended cutting, its drawback is that blade alignment is more complicated.
2) Suspended cutting involves the blade lowering to longitudinally cut the material as it passes between two rollers. At this point, the material is in a relatively unstable state, so the slitting accuracy is slightly lower than that of grooved cutting. However, this method offers convenient blade alignment and ease of operation. Razor blade cutting is mainly suitable for slitting very thin plastic films and composite films.
2. Alloy circular blade cutting mainly includes two methods: upper and lower circular blade shearing and circular blade crush cutting.
Circular blade cutting is the primary method for slitting thick films, composite thick films, paper, and other materials. For materials with a thickness above 100 μm, circular blade cutting is recommended.
- Tangent shearing involves slitting the material in the tangential direction of the upper and lower circular blades. This method allows for convenient blade alignment, as the positions of the upper and lower circular blades can be easily adjusted according to the slitting width requirements. Its drawback is that the material is prone to drifting at the slitting point, resulting in lower precision.
- Non-tangent shearing involves the material having a certain wrap angle with the lower circular blade, and the lower circular blade descends to cut the material. This method reduces the likelihood of material drifting, ensuring higher slitting accuracy. However, blade adjustment is less convenient, as the entire shaft must be disassembled to install the lower circular blade. Circular blade cutting is suitable for slitting relatively thick composite films and paper materials.
2) Circular blade crush cutting is less common in the industry. It mainly consists of a bottom roller that operates at the same speed as the material and has a certain wrap angle with it, along with an easily adjustable pneumatic slitting blade. This cutting method can be used for slitting both relatively thin plastic films and thicker materials such as paper and non-woven fabrics. It is a convenient slitting method and represents a developmental direction for slitter cutting methods.
Generally, the cutting methods of slitter blades include razor blade cutting and circular blade cutting.
1. Razor blade cutting involves fixing the blade onto the blade holder of the slitter, similar to a razor. During material operation, the blade is lowered to longitudinally cut the material, achieving the purpose of slitting. Razor blades are mainly divided into single-sided blades and double-sided blades:
- Single-sided blades are more suitable for cutting thicker and more rigid materials, such as thick films, as they are less prone to displacement during high-speed slitting, ensuring product quality. For thicknesses of 70–130 μm, single-sided blades are recommended.
- Double-sided blades are relatively softer and more suitable for cutting thinner materials, ensuring smooth edges and extending service life. For thicknesses below 70 μm, double-sided blades are recommended.
In terms of slitting methods, razor blade cutting is generally divided into grooved cutting and suspended cutting:
1) Grooved cutting involves the material running over a grooved roller, with the blade lowered into the groove of the roller to longitudinally cut the material. At this point, the material has a certain wrap angle on the grooved roller, reducing the likelihood of drifting. This method is commonly used when slitting cast PP films or narrow-edged films, as it improves slitting efficiency. However, compared to suspended cutting, its drawback is that blade alignment is more complicated.
2) Suspended cutting involves the blade lowering to longitudinally cut the material as it passes between two rollers. At this point, the material is in a relatively unstable state, so the slitting accuracy is slightly lower than that of grooved cutting. However, this method offers convenient blade alignment and ease of operation. Razor blade cutting is mainly suitable for slitting very thin plastic films and composite films.
2. Alloy circular blade cutting mainly includes two methods: upper and lower circular blade shearing and circular blade crush cutting.
Circular blade cutting is the primary method for slitting thick films, composite thick films, paper, and other materials. For materials with a thickness above 100 μm, circular blade cutting is recommended.
- Tangent shearing involves slitting the material in the tangential direction of the upper and lower circular blades. This method allows for convenient blade alignment, as the positions of the upper and lower circular blades can be easily adjusted according to the slitting width requirements. Its drawback is that the material is prone to drifting at the slitting point, resulting in lower precision.
- Non-tangent shearing involves the material having a certain wrap angle with the lower circular blade, and the lower circular blade descends to cut the material. This method reduces the likelihood of material drifting, ensuring higher slitting accuracy. However, blade adjustment is less convenient, as the entire shaft must be disassembled to install the lower circular blade. Circular blade cutting is suitable for slitting relatively thick composite films and paper materials.
2) Circular blade crush cutting is less common in the industry. It mainly consists of a bottom roller that operates at the same speed as the material and has a certain wrap angle with it, along with an easily adjustable pneumatic slitting blade. This cutting method can be used for slitting both relatively thin plastic films and thicker materials such as paper and non-woven fabrics. It is a convenient slitting method and represents a developmental direction for slitter cutting methods.
