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How to choose slitting blades
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How to choose slitting blades

Views: 137     Author: Site Editor     Publish Time: 2020-01-19      Origin: Site

Selecting the ideal slitting blade for your application ensures that you achieve the maximum blade life, minimize maintenance-induced downtime, and achieve your ideal cuts. Therefore, this article aims to tell you how to choose sitting blades.

When you want to buy the slitting blades, you have to consider the following things:

The suitable blade material for you slitting machine

The size of the slitting blades

The professional blade manufacturer

rotary shear slitting

The suitable blade material for you slitting machine

When slitting blades dull, the slitting operation stops while the entire bar set up is removed and the blades are replaced. Downtime for this type of maintenance can be several hours. Production losses are compounded when the metal slitting blades dull in the middle of the roll resulting in scrapping the remainder of the material. Selecting an ideal slitting blade material for the application and runtime requirements prevents costly downtime and material losses.

Both the top and bottom blades of the shear slitter can be sharpened to increase the life of the slitting blades. D2 steel slitting blades is the most common material used for slitting cutter. In applications where the material to be slit increases slitting blade wear, M2 steel slitting blades, carbide inlaid steel slitting blades, and CPM 10V steel slitting blades can be used to increase rotary slitting blade life.

52100 Steel

52100 steel slitting blade has the lowest wear life and as such, is rarely recommended for shear slitting applications. Shear machines that employ 52100 steel slitting blades must replace dull blades frequently to undergo frequent maintenance. Circular slitter blades manufactured from this material are low cost and are not usually sharpened. And the dull slitting blades are discarded and replaced with new blades. However, 52100 steel slitting blade material is required in shear slitting of specific plastic materials since it generates low amounts of heat during the cutting process.

D2 Steel

D2 steel is the most commonly used material for both top and bottom slitting blades. It has a good combination of both cost and associated wear life and is easy to sharpen. It is also a versatile material and can be used in shear slitting applications involving both plastics and paper. It is typically the most cost-effective option for both wear and low budget applications.

M2 Steel

M2 steel is also used for both top and bottom slitting blades and provides increased wear life since it is harder and tougher than D2 steel. M2 steel slitting blade is often recommended in shear slitting applications involving nonwoven materials and paper since these materials are highly abrasive and cause rapid blade wear. Switching from D2 steel slitting blade to M2 steel slitting blade allows operators to increase runtimes between blade changes resulting in less maintenance-induced downtime.


Prized for its wear resistance, CPM 10V steel type is ideal for applications that demand long runtimes and varying materials (multilayer plastics, papers, and nonwoven materials). Blades crafted of CPM 10V steel are easily sharpened which helps to offset the higher costs of procuring CPM 10V steel slitting blades.

Carbide inlay blades

In environments that require a 24-hour uninterrupted operation, carbide slitting blades are ideal for bottom blades. Cemented carbide slitting blade maintains sharpness by cutting long coils of abrasive. Mounting inserts are made of D2 steel, while cemented carbide is only mounted at the point of the compression to provide the greatest benefit while minimizing costs. It is important to note that carbide inlay blades have very little shock resistance so accurate setting of the cant angle is very important when using this material.

rotary slitter blade

Split bottom blades

Most shear slitting blades are solid in construction, making it impossible to change a single blade on a bar without removing every blade. As a result, every blade is replaced (or at minimum removed and placed back onto the line) when a single blade dulls, chips, or breaks. Changing out all slitting blades on a bar can take hours depending on the number of blade setups on the line.

Split bottom blades allow operators to replace a single blade without removing all of the blades on the bar. Compared with a solid circular slitter blades, when the bottom slitting blade is dull, pulling it off and re-installing anywhere on the bar with only the use of a torque wrench.

Selecting the right sllitting blade material for your shear slitting application is critical to maximizing uptime and decreasing material losses and maintenance costs. Expert industrial slitting baldes manufacturers analyze your specific budgetary, material, and runtime needs to recommend an ideal shear slitting blade material and configuration. Nanjing Jingfeng Knife Manufacturing CO., Ltd. is a professional slitting blade manufacturer, providing high-quality and high accurate slitting blades/ round cutter blades.

The size of the slitting blades

A commonly used rule of thumb is to buy a round cutter blade that is somewhere between three and five times as thick as the thickest material you plan on slitting because a rotary slitter balde has to be able to withstand the most challenging job.

If, for example, you're slitting up to 0.187-inch-thick material, you need a balde somewhere between 0.561 (3x) and 0.935 (5x) inch thick. More commonly, these sizes would be reduced to 0.500 and maybe 0.750 inches thick. (Actually, very few people use a 0.750-inch knife, and even fewer would choose a blade 0.935-inch-thick for slitting 0.187-inch-thick steel.)

These rule-of-thumb numbers have been bantered about for years, and the one to use depends on which slitting blade manufacturer you choose. The knife that is three times as thick is adequate for lighter slit gauges and is cheaper, but it will not provide sufficient rigidity.

The slitting blade that is five times as thick as the thickest material provides much better rigidity, but it will seem to be overkill for most of the products you will be slitting. Most service centers don't want to spend the money on 0.750-inch-thick knives when 0.500-inch-thick knives usually will suffice.

The popular choice in this situation is to buy a 0.500-inch-thick rotary shear slitting. Some choose this thinner balde to save money. Others choose it because working with the 0.500-inch-thick blade simplifies setup math, and slitting blades can be doubled up if needed.

The professional blade manufacturer

When selecting a slitter blade manufacturer, look for one with the experience to evaluate your entire slitting process operation, make recommendations to improve blade lifetime and cut quality, and supply you with slitting knives that meet the unique needs of your business. Expert slitting baldes manufacturers analyze the material to be cut, current blade selections, runtime requirements, and budgetary needs before recommending the best slitting blade material for a specific shear slitting application. The right slitting blade material provides a perfect mix of toughness, hardness, cost, and flexibility. Nanjing Jingfeng Knife Manufacturing CO., Ltd. is a professional slitting blade manufacturer, providing high-quality and high accurate slitting blades/ round cutter blades.

round cutter blades

Finding the best way to choose the slitting blades, including choosing the suitable blade material for your slitting machine, the size of the slitting blades and the professional blade manufacturer. Nanjing Jingfeng Knife Manufacturing CO., Ltd. is a professional slitting blade manufacturer, providing high-quality and high accurate slitting blades/ round cutter blades. If you have any needs, please contact us.

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