All You Need to Know About Coil Slitting Line

Posted on Dec 29, 2020

Coil Slitting Line

Coil slitting lines, also called steel coil slitting production lines, are the production lines that are designed for cutting wide metal coils to a desired width or length with a rapid tooling change system, de-coiler, and decoiler systems.

What Is a Coil Slitting Line?

Coil slitting lines, also called steel coil slitting production lines, are the production lines that are designed for cutting wide metal coils to a desired width or length with a rapid tooling change system, de-coiler, and decoiler systems. Employing high precision cutters which are typically circular slitters and tooling change systems, the coil slitting line is not only reliable and flexible in usage for steel and various metal rolled coils.

The coil slitting line in the factories can produce multiple widths or slit mults. The term slit mult refers to the rolls of coiled metal from a mill. They have already been slit to predetermined specifications from the master coil, which is also widely known as the slit-to-width coil. The precision coil slitting line typically consists of 3 main parts, including the de-coiler, the slitter, and the recoiler. 

During the production cycle, the coil material is loaded and flattened by the de-coiler to eliminate the defects from the surface, then the material will be fed through the nip between the circular slitting wheels, which are mounted both on the top and at the bottom. Subsequently, the slit-to-width coil will be re-wound through the recoiler.

When selecting the right coil slitting lines for your applications, it is essential to be aware of the components, arbor size, tooling package, horsepower as well as tensioning devices that are ideal for the metal coil material to be cut. 


Benefits of Coil Slitting Line


● optimal quality

For starters, the high-quality and critically-produced slitters can cut with minimum burr. Secondly, using a coil slitting line for precision coil cutting and high-quality coil production can reduce the material costs, since the customers can find coiled steel products in a standard and precise width. To cut the coil to a certain width or slit the sheet metals to a certain length no longer need a secondary service in high volume applications.


● high accuracy and efficiency

Moreover, the coil slitting line typically provides a high level of automation, making the machine system not only easier to manipulate, monitor and maintain, but increasing productivity and accuracy, and efficiency. From the automated and quick loading of the decoiler to the automatic high-precision stacking devices, the coil slitting line can achieve high performance and fast operations.

:: Read more: What Is Steel Coil Slitting Line?


How Coil Slitting Works?

As mentioned, the coil slitting line involves the de-coiler, slitter, and re-coiler, the three parts can optimize the quality of the slit-to-width coil products.


1. Uncoiling: 

In a de-coiler, or uncoiler, the uncoiling process starts with loading the metal coil or master coil onto the device, which can be a dual cone form or the expanding mandrel single end form. The dual cone de-coiler is better suited for heavier loads while the mandrel type is suitable for both light and heavy-duty applications.

The raw material is loaded into the cones of the de-coiler through a pusher ramp and quick loading coil car. The loading car threads the single-end mandrel into the inner diameter of the master coil. The material is spined off the cone or mandrel, then be peeled to ensure the coil head can smoothly enter edge guides before going through the flattener or other kinds of the straightener. The flattening process is essential if flatness and free of defects on the surfaces are significant in further operations. 


2. Slitting: 

In the cut-to-length stage, the material will be fed into the slitter which consists of 2 arbors that are parallel to each other, installed with rotary knives. The slitting knives will partially advance into the coil material and lead to a crack or fracture on both sides of the metal material. The mults will, in this stage, be separated from one to another. Depending on the thickness of the coil stock, rubber stripper rings are used to obtain a better edge, preventing any burr that may affect the quality of the product and the downstream operations.

As the stock is accurately cut, the outside edges of the metals have edge trim, which will be treated by a scrap winder. On the other hand, if the workpiece to be cut is extremely thin, the operator can use a looping pit that takes up the varying thickness of the slitted coil when the edge area is thinner than the center part. Also, this looping pit can take up the extra volume before the coil is fed into the tensioning device.

The tension device in the coil slitting line is usually the tension stand that is positioned prior to the re-coiler. It is required in the coil slitting line since the master coil has a larger diameter in the center of the width than at the edge areas. As a result, the stock from the center area of the master coil will be taken up faster as the other area is loosely hanged without the tensioning device.


3. Recoiling: 

In general, the recoilers used in coil slitting lines are the expanding mandrel form that can mostly expand ranging from a diameter of 20” to 24” or more with the expansion pads or leaves. The device recoils the slit-to-width coils when fitting with an overarm shaft with separating discs. The discs which are positioned directly in line with the slitting cutters can prevent any interleaving problems of the narrow coil stocks. Subsequently, the finished products will be bent on the outside diameter, forcing off from the mandrel to a coil car.


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