A Quick Guide to Slitter Blades

What Is a Slitter Blade?

In many different product industries, the materials that are used to create products need to be shaped and sized into smaller units for processing. This process is called “slitting,” and it requires the use of several blades. These slitter blades are used to trim vinyl, film, fabrics and textiles, paper, laminates and more. Depending on the manufacturing process required, there are different methods of slitting that are most effective. Carolina Knife Co. would like to walk you through three of these methods so that you can have a general knowledge of the processes.

Razor Slitting

This method of using slitter blades is most commonly utilized in the trimming of plastics, vinyl, film, tapes, and other thin materials. Because this method is fairly simple and inexpensive, it is very widely used across many industries. The razor-sharpness of these slitter blades produces a very clean cut, and results in minimal dust or debris collecting during the process. The razor slitting process is less effective, however, with thicker materials that encounter greater resistance to thin blades. Slitter blades for this conversion process are not expensive, and can be replaced easily. Fewer moving parts mean fewer broken pieces, and these razor applications usually keep the blade stationary, while materials are moved into them. The width of the cut can easily be adjusted by adding or removing blades, and can accommodate even very thin cuts. 

Shear Slitting

Slitting using the shear method is utilized when the materials that need to be converted are thicker than could be used in razor slitting. Usually, these materials include heavy films, paper products, foils, composite materials, and layered materials. Shear slitting implies that the process uses two blades (such as in “kitchen shears” or “sheep shear). Essentially, this process creates a powerful scissor, with two blades meeting at a predetermined angle necessary for the slit desired. The meeting point of these two blades, called the male and female blades, are where the material is split. Interestingly, this method produces the least amount of heat due to friction, so it is often used in conversion processes that require long run-times. 

Scoring or Crush Cut Slitting

This method of slitting is the quick and messy method. This process can be used when precision is not necessary, and large, thick, or tough materials need to be trimmed down and separated. This process depends upon a pneumatic holder to force the blade through materials, creating a rough edge and slight compression to the material surrounding the cut. Although this method of slitting is imprecise, it is effective and inexpensive. 

Carolina Knife Co. is Your Slitter Blade Resource

If your business requires high-quality slitter blades for your conversion of materials, we encourage you to trust Carolina Knife Co. with all of your blade requirements! We manufacture slitter blades according to several OEMs, and can also custom design any blade for any process. Contact us today to speak to a slitter blade specialist, and we will be able to answer any questions you may have concerning our industrial blade products.


Carolina Knife Co.

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