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Why Does High-GSM Paper Develop Rough Edges During Sheeting? Causes and Solutions
Published on 09.10
In paper converting, high-GSM paper is generally more difficult to achieve with clean, smooth cutting edges than standard paper.
Materials such as FBB, duplex board, kraft paper, coated paper, and other high-GSM packaging papers may develop rough edges, paper dust, or even slight tearing during roll-to-sheet sheeting if the knife condition, cutting system, or production parameters are not properly matched to the material.
So, why does high-GSM paper tend to develop rough edges? How can you check the problem after it occurs? And what type of paper sheeter is suitable for high-GSM paper?
1. What Are the Common Types of High-GSM Paper?
High-GSM paper is generally thicker and stiffer, which means more cutting force is required during the sheeting process.
Common high-GSM paper materials include:
FBB / Folding Boxboard
FBB is widely used for cosmetics, food, pharmaceutical, and gift packaging, as well as high-quality printed products.
Duplex Board
Duplex board is commonly used for folding cartons, boxes, and other packaging applications.
Kraft Paper
Kraft paper has good strength and is widely used for paper bags, cartons, industrial packaging, and other applications.
Coated Paper
Coated paper has a treated surface that provides good print quality and is commonly used for high-quality printing and packaging.
In addition, many high-GSM specialty papers and packaging boards are supplied in rolls and need to be converted into sheets of different sizes.
2. Why Does High-GSM Paper Develop Rough Edges During Sheeting?
High-GSM paper is thicker and stiffer, so it requires greater cutting force. If the cutting process is not stable or continuous, the paper may be compressed, pulled, or torn during cutting, resulting in rough edges.
The most common causes include the following.
2.1. Worn Cutting Knife
Cutting knives gradually wear during long-term operation.
When the knife becomes dull, more force is required to cut through the paper. This can increase compression and pulling at the paper edge, resulting in rough edges and paper dust.
If the cutting edge is clean when production starts but rough edges gradually appear after extended operation, the first step should be to check the knife condition.
2.2. Improper knife Adjustment
Cutting quality depends not only on knife sharpness but also on how the knive work together.
If the knife adjustment is not suitable, the paper may not be cut smoothly and may instead experience excessive compression, affecting the edge quality.
This is particularly important when processing thick or coated paper.
2.3. Unstable Paper Running
If the paper shifts, wrinkles, swings, or experiences tension changes before entering the cutting section, the knife cannot maintain a stable cutting condition.
Therefore, stable unwinding, feeding, and tension control are also important for achieving good cutting edges.
2.4. Paper Characteristics
Even papers with the same GSM can behave differently during cutting.
Fiber structure, density, moisture content, surface coating, and composite structure can all affect the final cutting result.
Therefore, GSM alone cannot determine whether a paper is likely to develop rough edges. The actual material should also be tested.
3. How Can You Check the Problem After Rough Edges Appear?
If rough edges appear when processing high-GSM paper, check the following points step by step.
First, Check the Knife
Check whether the knife edge has obvious wear, damage, or has become dull.
Then, Check the Knife Adjustment
Make sure the knives are correctly installed and properly adjusted. Check whether there are signs of excessive compression or tearing on the cut edge.
Check the Paper Running Condition
Observe whether the paper runs smoothly into the cutting section and whether there is any shifting, wrinkling, or noticeable movement.
Check the Production Parameters
If the cutting edge is normal at low speed but rough edges appear when the speed increases, check the feeding, tension, and cutting systems during high-speed operation.
Finally, Check the Paper Material
If rough edges only occur with one specific material while other papers are processed normally, check the thickness, density, coating, and other characteristics of that paper.
This step-by-step inspection can help determine whether the problem comes from the knife, the machine, or the paper itself.
4. Why Is a Double Rotary Knife Suitable for High-GSM Paper?
For high-GSM and coated paper, the cutting method itself can have a direct impact on edge quality.
A conventional single-knife system mainly relies on the knife moving downward to cut the paper. A double rotary knife system uses two knives rotating synchronously, creating a cutting action similar to shearing.
This cutting method can reduce the compression caused by a conventional cutting action and is more suitable for thick paper, high-GSM materials, and coated paper in continuous production.
Therefore, for companies that regularly process high-GSM paper, it is important to consider not only machine speed but also whether the cutting system is suitable for the material being processed.
5. CHM Machinery SGT Double Rotary Knife Paper Sheeter
For high-GSM and coated paper processing, the CHM Machinery SGT Series Double Rotary Knife Paper Sheeter uses synchronized upper and lower rotary knives and is designed for thick and high-GSM paper.
The reference specifications include:
- Paper GSM: 200–1000 GSM
- Maximum cutting meter speed: 300 m/min
- Maximum cutting speed: 300 sheets/min
- Maximum roll diameter: 1800 mm
- Maximum paper width: 1400 / 1700 / 1900 mm
- Cutting length: 450–1650 mm
Different models can be selected according to the customer's raw paper width and production requirements.
The synchronized double rotary knife system provides a stable shearing action during cutting and is suitable for high-GSM materials such as FBB, duplex board, kraft paper, and coated paper.
In addition to cutting performance, the series is also designed to address common issues that may occur when processing high-GSM and coated paper, such as paper dust, paper lint, cutting marks, and surface bright spots, helping customers achieve cleaner and more consistent finished sheets.
6. Which Customers Are Suitable for a Double Rotary Knife Paper Sheeter?
If your factory regularly processes the following materials, a double rotary knife system can be a suitable choice:
- FBB / Folding Boxboard
- Duplex board
- Kraft paper
- Coated paper
- Packaging board
- High-GSM specialty paper
It is especially suitable for paper converting companies that require continuous production, high-volume processing, and consistent cutting-edge and sheet quality.
7. What Should You Consider When Sheeting High-GSM Paper?
The cutting quality of high-GSM paper is not determined by one factor alone.
Knife condition affects cutting performance;
The cutting system affects how force is applied to the paper;
Feeding and tension control affect the stability of the paper entering the cutting section;
And the paper's own fiber structure, thickness, and coating can also affect the final result.
Therefore, when rough edges appear, it should not simply be assumed that “the knife needs to be replaced.” The material, machine structure, and production conditions should all be checked.
For companies that regularly process thick paper, selecting the right cutting method at the equipment selection stage is often more effective than making repeated adjustments during production.
For high-GSM paper, a good paper sheeter should do more than simply cut the paper. More importantly, it should provide clean cutting edges, stable operation, lower material waste, and consistent sheet quality for subsequent printing and packaging processes.
Choose the right cutting method for more stable and efficient high-GSM paper processing.
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