Paper slitting is usually described in terms of the finished roll it produces — a wide parent roll cut down to a specified width. But behind that outcome is a more specific question: how is the web actually cut at the point of separation? Industry sources generally group the answer into three established approaches — razor slitting, shear slitting, and score/crush cutting.
This guide explains what each method is, in general terms, and what it means for a buyer specifying a converted roll. It does not describe any specific converter’s equipment or setup — it is general industry education, written for manufacturing engineers, production managers, buyers, and converters comparing the three approaches.
What Does “Slitting Method” Mean?
Slitting, broadly, is the process of dividing a wider continuous web into one or more narrower finished widths. Our guide to how a slitter rewinder works covers that overall process — loading, unwinding, tension control, cutting, and rewinding — from end to end, and our guide to slitting vs. rewinding explains how slitting differs from rewinding as a converting step.
This article focuses on one piece of that process specifically: the cutting mechanism itself — the physical means by which the moving web is actually separated into narrower widths at the slitting station. That mechanism is what “slitting method” refers to, and it is a separate question from the overall slitting or converting process described in the guides above.
The Three Main Slitting Methods
Industry sources generally describe three established cutting methods used in web slitting:
- Razor slitting — a blade cuts through the moving web.
- Shear slitting — two rotary knife edges work together in a scissors-like cutting action.
- Score / crush cutting — a circular knife works against an anvil surface to cut or score the web.
Which method is appropriate depends on the substrate and the application, and no single method is universally “best” across every material and use case. The sections below explain each method’s general principle.
Razor Slitting
Razor slitting cuts the moving web with a blade, or a series of blades, positioned to slice through the material as it passes through the machine. It is a comparatively simple cutting arrangement compared to the other two methods described below.
Razor slitting is commonly associated with thinner, more flexible substrates, such as films. This is a general association drawn from industry technical material, not a rule that applies to every material or setup — the appropriate method for a specific job still depends on the substrate and the application.
Shear Slitting
Shear slitting uses two rotary knife edges — commonly described as a male and female pair — that work together in a scissors-like cutting action as the web passes between them. Each knife edge contributes to the cut, rather than a single blade slicing through the material on its own.
Industry technical material generally associates shear slitting with a clean, uniform cut edge, and it is used across a range of thin to moderate-thickness materials, including paper. Because the two knives work together rather than relying on a single edge, shear slitting is a commonly used approach in converting operations where edge consistency matters to the application.
Score and Crush Slitting
Score and crush cutting are commonly grouped together in slitting equipment terminology, because both use the same general approach: a circular rotating knife works against a hardened anvil surface rather than against a second cutting edge.
Terminology beyond that shared principle is not perfectly standardized. Some industry sources use “score” and “crush” interchangeably to describe the same cutting approach. Other technical sources distinguish them more precisely: crush cutting fully penetrates the web to separate it into two pieces, while score cutting only partially penetrates it, leaving material that can be folded rather than fully separated. The terminology is not universal. If a specification or drawing names one method specifically, clarify what the term means in that requirement rather than assuming the terms are interchangeable.
This general approach is associated with a range of different substrates of varying thicknesses and rigidities. Technical material also generally associates it with a less uniform edge than shear slitting, and with the potential for more dust generated during separation — general associations rather than fixed rules, since actual results depend on the specific material and setup involved.
How the Methods Differ
The table below summarizes the general principle behind each method, in buyer-facing terms. None of these comparisons are absolute — they describe general associations found in industry technical material, not guarantees that apply to every material or every piece of equipment.
| Method | Cutting Principle | General Substrate Considerations | Buyer Relevance |
|---|---|---|---|
| Razor | A blade cuts through the moving web. | Commonly associated with thin, flexible substrates such as films. | Worth discussing if your material is thin and flexible. |
| Shear | Two rotary knife edges work together in a scissors-like action. | Used across a range of thin to moderate-thickness materials, including paper; generally associated with a clean, uniform edge. | Worth discussing if a consistently clean cut edge matters to your application. |
| Score / Crush | A circular knife works against an anvil surface. | Associated with a range of substrates of varying thickness and rigidity; may generate more dust and a less uniform edge than shear, depending on the material. Terminology varies by source: some sources use “score” and “crush” interchangeably, while others use crush for full penetration and score for partial penetration. | Worth discussing for tougher or more rigid substrates, with edge, dust, and terminology (full vs. partial penetration) confirmed for your specific requirement. |
What Determines Which Slitting Method Is Appropriate?
A converter weighs several general factors when a cutting method matters to a job, including:
- Material or substrate type
- Thickness or caliper — see our guide to paper caliper for how thickness is measured and expressed
- Rigidity or flexibility of the material
- Finished-edge requirement, where one exists
- Target slit width
- The downstream application the finished roll is used for
Characteristics like dust generation and edge finish can vary by material and by the specific setup used, so they are best discussed directly with a converter for your particular job rather than assumed from a general comparison. This article describes the methods themselves — it is not a troubleshooting or setup guide, and it does not describe how any specific converter selects a method for a given job.
What to Specify Instead of Guessing the Cutting Method
Unless your application, an engineering drawing, or a contract specifically calls for a particular cutting method, you generally gain more by clearly communicating your finished-roll and application requirements than by trying to guess which cutting method should be used. A converter can evaluate the appropriate method against your actual requirements far more reliably than a buyer can guess it in advance.
Useful information to share with your converter includes:
- Material or grade
- Target finished width
- Width tolerance requirement — see our guide to paper slitting tolerances
- Core requirement
- Roll outside diameter or length requirement
- Downstream application
- Any known finished-edge requirement
Our guide to preparing an RFQ covers the complete list a converter needs to quote and run a job accurately. If an engineering drawing, specification, or contract explicitly requires a particular cutting method, communicate that requirement directly — but note that not every requested method can necessarily be accommodated by every converter, so it is worth confirming fit before the job is quoted.
Paper Slitting at Paper Dimensions
Paper Dimensions provides custom paper slitting for manufacturers with finished-roll requirements including target width and downstream application specifications — finished widths from 0.5″ to 112″, held to a published ±1/32″ width tolerance. See our Paper Slitting capability page or submit your roll requirements through the quote request form for review.
Key Takeaways
- “Slitting method” refers to how the moving web is physically cut, not to the overall slitting or converting process.
- Razor, shear, and score/crush cutting are three established approaches, each using a different cutting action at the point of separation.
- No single method is universally best for every substrate or application — suitability depends on the material and the job.
- Score and crush cutting are commonly grouped together, but terminology varies; some technical sources distinguish full crush cutting from partial score cutting.
- Buyers generally gain more by clearly communicating finished-roll and application requirements than by guessing which cutting method should be used.