Slitting Rewinder Blade Classification, Maintenance, and Installation

In paper manufacturing, ensuring that the base paper entering the rewinder through the slitting blade is free of fraying, creasing, and other quality defects is the final step in this precision process.

Whether it’s household paper products such as napkins, toilet paper, and paper rolls, or corrugated paper, the biggest concern during the slitting process is the formation of lint and frayed edges. This not only compromises the quality of the paper but also increases operating costs.

At the same time, due to the high speed operation of the rewinder, the slitting blades are highly susceptible to wear and becoming dull.

This places high demands on the material, manufacturing process, and flatness of the slitting rewinder blades.

Purchase and use carefully designed slitting blades made from high strength materials such as martensitic stainless steel, tungsten steel, die steel (SKD11), high speed steel (SKH51), and powdered metal steel. These blades combine sharpness, durability, and high strength to deliver a longer service life.

The slitting blades are available two hole, three hole, and slotted configurations with the specific choice depending on the design of the slitting blade holder.

When using cutting blades, you may have encountered issues such as rough edges on the cut or excessive slitting blade wear. This is not only related to the quality of the cutting blades but also to selecting the right ones.

In the papermaking industry, common types of slitting knives include rewinder circular blade, straight blade, and pneumatic blade.

Cuts by utilizing the relative movement of the material against the slitting blade edge. Suitable for cutting thin materials, capable of producing clean cuts and preventing edge curling. Ideal for use on medium to low speed rewinding machines.

A disc shaped blade that cuts by rotating. The slitting blade rotates in sync with the material to achieve continuous slitting. The rewinder circular blade is mainly used for cutting paper, film, gold, silver foil, aluminum foil, copper foil, tape, and other articles. It is divided into upper blades (disc blades and flat circular blades) and bottom blades (bowl shaped blades and multi blade knives), and is suitable for slitting paper rolls and high speed rewinding machines.

Used for cutting various household paper products, such as napkins, toilet paper, and paper rolls.

The slitting pneumatic blade‍‍ is a specialized circular slitting blade whose lifting and cutting mechanisms are precisely controlled by a pneumatic system. During the slitting process, the pneumatic slitting knife applies precise pressure against the rotating lower blade, thereby creating a shearing action. Pneumatic knives offer faster slitting speeds, higher precision, and smoother operation, effectively protecting the paper material from damage.

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Proper adjustment of the slitting blade’s settings can reduce blade wear, minimize downtime, and lower production costs.

Ensures the installation precision of the slitting blade, which helps prevent uneven wear.

Promptly removes adhesive buildup to prevent heat generation caused by friction.

Periodically sharpen the blades and inspect them for signs of wear.

When not in use, slitting blades should ideally be covered with a protective guard to prevent unnecessary damage and rust.

Sharp blades always require extra caution and attention.

Familiarize yourself with the equipment's operating procedures; ensure all machinery is powered off when handling slitting blades.

Always wear protective gloves and use appropriate tools when installing or replacing slitting blades.

Under no circumstances should you ever directly touch the blade with your fingers.

Always store slitting blades in a designated container; avoid placing them on high surfaces or near edges to prevent accidental drops and resulting cuts.

Even dull slitting blades that have been removed should be handled with the same care as sharp ones to prevent chipping or damage to the cutting edge.

Rewinder Circular Blade Installing and Precautions

When starting up, gradually increase the speed and check the gap between the upper and lower slitting blades to ensure it is appropriate. If the gap is too wide, it will cause fraying; if it is too narrow, it will damage the knives.

When aligning the slitting blades, lower the upper rewinder circular blade until it is approximately 2 to 3 mm above the bottom blade, then lock the upper blade holder in place. Carefully align the upper slitting knife directly over the center of the lower blade's groove before fully lowering the upper blade holder to prevent the blades from colliding with one another.