Bottom knives play a fundamental role in the operation of slitters and machines in general.
These components are typically mounted on the lower shaft of the machines, strategically positioned to interact with the upper knives or main blades.
In particular, the bottom knives provide a stable and resistant surface against which the blade “works” to cut the material.
This process, commonly called shear cut, allows a precise and clean cut, ensuring a high-quality result.
In addition, the bottom knives can be adjusted or replaced to suit different types of materials or cutting requirements.
This flexibility makes machines with bottom knives suitable for a wide range of applications: from the paper and cardboard industry, to converting, fabric production and much more.
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Saucer bottom knives
The bottom knives, as essential components in cutting machines, can be secured in different ways, depending on the specific needs of the application.
The various types of securing include:
- Smooth hole blocking (free locking)
- Self-locking
- Screw locking
- Multilock securing (screw + ring)
In conclusion, the choice of the method for securing the bottom knives depends on various factors, including the type of machine, the material to be cut and the specific needs of the application.
Bottom knives maintenance by Negri Lame
- Free locking bottom knives: sharpening of the cutting edge only.
- Screw locking bottom knives: replacement of screw locking and sharpening of the cutting edge.
- Self locking bottom knives: replacement of eccentric ring + balls and sharpening of the cutting edge.
