A Review of Different Sheet Slitting Methods and Their Applications
Many industries require slit sheets to produce their products. Different sheet slitting methods are carried out to make it easier for industries to use metal coils. Mother coils are very heavy and cannot be directly converted into products. Therefore, these heavy coils need to be converted into lighter coils with smaller thicknesses using sheet slitting methods.
There are various machines that can perform slitting operations on sheets of different materials in customized dimensions. In this article, we will discuss what the slitting process is and explain the different types of sheet slitting. Then, we will present information about the machines and dimensions of slitting, the purpose of this operation, and the applications of slit sheets. So stay with us throughout this article.
This article examines the following topics:
What Is Sheet Slitting?
In order for different industries to more easily use heavy metal coils and produce their intended products, these coils need to be lighter and narrower. The slitting process (Roll Slitting) is responsible for performing this task. Different types of sheet slitting are carried out using sheet cutting machines so that the mother coils can be used.
In this process, the mother coil, which may be made of steel sheet, brass, copper, or aluminum, is placed on a carriage and moved toward the recoiler. Then it is passed between rollers to remove waves and defects and to flatten the sheet. At this stage, the sheet head is cut with a guillotine to make it uniform.
Next, it is guided to the slitting section or slitter, which has cutting blades mounted on two parallel shafts. Here, with high speed and accuracy, the sheet is cut into narrower strips with specified sizes. In the final stage of the slitting line, the sheets are turned into smaller, thinner rolls, packaged, and either released to the market or sent to customers. Cutting can be performed longitudinally or transversely. The roll-to-roll cutting machine is a device for transverse cutting of sheets.
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Slitting Methods for Different Sheets
Hot-rolled sheets, galvanized sheets, cold-rolled sheets, aluminum, stainless steel, and coated sheets are among those processed using various slitting methods. One classification of sheet slitting methods is based on thickness. According to thickness, sheet slitting can be divided into thin slitting, medium slitting, and thick slitting, each with its own characteristics.
Another classification that should be mentioned is fixed slitting and recoiling slitting, during which the mother coil is converted into lighter coils. Let us further discuss these two methods of sheet slitting.
What Is Fixed Slitting and Why Is It Used?
As mentioned, one of the sheet slitting methods is fixed slitting. In this case, the mother coil does not need to be unwound. The coil is placed directly on two special rollers and starts to rotate. Then it is cut by blades set at specific distances from each other. Fixed slitting is used for coils that are light and have a smaller diameter because heavy coils require large, strong blades.
Uniform cutting, low dimensional tolerance, and the ability to slit sheets in different thicknesses and sizes are among the features of a quality slitting line.
Recoiling Slitting
Slitting using the recoiling method is different from fixed slitting. In this method, the mother coil is no longer stationary; instead, it is unwound by a decoiler at the beginning of the line. The coil is slowly unwound, its head placed at the machine’s edge, and layer by layer it enters the slitting line.
Next, using blades placed at certain distances from each other (the size and shape of cuts are set by the operator and digital systems), the coil is cut into specific widths. At the end of the machine, the slit strips are rewound into lighter coils of different widths. Observing safety measures in sheet cutting lines is very important to prevent accidents and damage.
Different Machines and Dimensions in Slitting
The slitting process is carried out by various machines. The use of these machines depends on the industry, application, and customer requirements. Slitting machines differ in design, thickness capacity, speed, and type of blades, and they are adjustable. These machines can be simple and small or complex and large, and should be chosen according to the required speed and existing conditions.
Different types of sheet slitting are performed by various machines for sheets of copper, galvanized steel, hot-rolled steel, cold-rolled steel, and others. As mentioned, slitting machines also have different speeds. Some machines operate at normal speeds and can slit about 40 meters of strip per minute. Others operate at higher speeds, slitting about 150 meters of sheet per minute.
Slitting machines have the capacity to cut sheets into three thickness ranges: thin (0.25–2 mm), medium (2–6 mm), and thick (6–15 mm). One of the machines that performs sheet slitting in these thickness ranges is the roll-to-roll cutting machine. Each type of roll-to-roll cutting machine for thin, medium, and thick sheets has specific features.
Slitting dimensions, meaning the width, length, and thickness of the strip, also vary depending on usage. In all types of sheet slitting, it is important that dimensional tolerance does not exceed 0.05. Typically, slitting machines can cut sheets with widths ranging from 15 to 1500 mm, thicknesses of 0.6 to 2 mm, inner diameters of 40 to 60 mm, and outer diameters up to 1800 mm.
Considering the demand of various industries for cut sheets and the importance of sheet slitting, investing in sheet cutting lines can be a profitable option.
Purpose of Slitting and Applications of Slit Sheets
The purpose of using sheet slitting methods is the wide application of slit sheets and the need to increase efficiency, reduce waste and production costs, speed up production, and improve the accuracy and quality of the final product. Using slitting, one can obtain smooth, precise strips without distortion in the shortest time.
The features of slit sheets make them suitable as raw materials in many industries. In line with the topic of sheet slitting methods, you may also refer to the article comparing domestic and foreign sheet cutting lines to gain useful insights. Different types of slit sheets have different applications depending on their properties. Below are some applications of slit sheets:
- Automotive: car parts, interiors, body, chassis
- Construction: doors and windows, suspended ceiling frameworks, railings, steel structures, light structural frameworks
- Home appliances: bodies and parts of stoves, refrigerators, washing machines
- Oil and petrochemical: pipes, tanks, reservoirs
- Water and wastewater
- Agriculture: agricultural machinery
- Electrical industry: equipment, electrical covers and casings, housings and bodies of electrical devices
- Packaging industry: clamps and protective strips, cans
- Food industry
- Shipbuilding industry
- Heating and cooling industries
- Aerospace industry
- Energy industry: wind turbines, solar panels
- Military equipment
- Industrial machinery industries
- Medical industry: medicine storage containers, surgical equipment
- Other uses such as industrial hardware, armored cables, cabinets, furniture, tables
Conclusion
In this article from Mazs Group magazine, we reviewed different types of sheet slitting. Slitting operations are performed so that heavy metal coils, which cannot be directly used in production, can be converted into lighter coils. Slitting methods are of two types: fixed and recoiling, which we explained here. The roll-to-roll cutting machine is one of the devices that performs sheet slitting in thin, medium, and thick thicknesses. Slit sheets have very wide applications, some of which were mentioned in this article.
FAQ
Sheet slitting is the process of cutting wide metal coils into narrower strips using specialized machines. This operation makes heavy mother coils more manageable and suitable for use in various industries.
The two main slitting methods are fixed slitting and recoiling (twist) slitting. Fixed slitting is used for lighter coils that don’t need to be unwound, while recoiling slitting involves unwinding the mother coil, slitting it into narrower strips, and rewinding them into lighter coils.
Slitting machines can process a wide range of materials including hot-rolled steel, cold-rolled steel, galvanized sheets, stainless steel, aluminum, copper, and coated sheets.
