Automatic Strapping Machine for steel slit coils

In SAIZAR we design and manufacture Automatic Strapping Machines for slit coils.

The strapping of slit coils is made individually or in bundles, with steel strap or polyester (PET) strap.

Each machine is tailored to your longitudinal cutting line, to the turnstile, to the strapping table or to other machines of your production line, as well as to the packaging the customer’s request.

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What are the slit coils and why do they need to be strapped?

Slit coils are obtained by cutting a steel coil longitudinally into several narrower bands. Each band forms a separate coil. If it is not secured, the tips will come loose and the coils may displace during handling.

The band can vary in width and thickness, depending on the customer’s production requirements. Strapping keeps each coil compact and protected during handling, storage and transport.

Types of strapping for slit coils

Depending on your process and the requirements of the customer, we use three different types of strapping.

Circumferential strapping (OD) on turnstile

The Strapping Machine places the strap around Outer Diameter of the coils while they are positioned on the arm of the turnstile.

A vertical rammer holds the tips of the band before starting the strapping process. The strapping machine automatically carries out all the necessary strapping operations before the vertical rammer releases the coils.  

It is also possible to strap the slit coils on the carriage of the customer, as well as in the spooler of the longitudinal cutting line, however, it all depends on the customer’s requirements, available space, required productivity and many other factors.

Flejadora automática para bobinas cortadas de acero - Flejado circunferencial (OD) en torreta giratoria - Saizar Strapping Machines SL
Flejadora automática para bobinas cortadas de acero - Flejado circunferencial (OD) en torreta giratoria - Saizar Strapping Machines SL

Radial strapping (ID) of individual coils

The strap passes through the eye of the coil, in order to obtain the radial strapping of the coil.

It holds the coils together and reduces the risk of telescopic displacement, that is, the coil windings sliding over one another.

This type of strapping is usually carried out with the coil placed on a strapping table, with the coil eye in a vertical position, and by rotating the coil to each of the strapping positions.

Flejadora automática para bobinas cortadas de acero - Flejado radial (ID) de bobinas individuales - Saizar Strapping Machines SL

Strapping of bundles of slit coils

Several slit coils are grouped together, placed on a pallet with spacers between them, and strapped together as a single coil bundle.

We apply radial strapping across the Inner Diameter of the coils using the hole of the center of the pallet, and strapped the transversal around the perimeter of the coil bundle, depending on how the product is going to be handled and dispatched.

Flejadora automática para bobinas cortadas de acero - Flejado de paquetes de bobinas cortadas - Saizar Strapping Machines SL
Flejadora automática para bobinas cortadas de acero - Flejado de paquetes de bobinas cortadas - Saizar Strapping Machines SL

The rammer: securing the tip band points before strapping

The rammer is installed above the turnstile, at the end of the cutting line.

Its controls hold the tips of the bands in place and have slots through which the strap passes inside each one. It is synchronized with the strapping machine and the unloading carriage of the line, and the rammer is not released until all strappings have been completed.

Without the installation of the rammer above the turnstile, the material would have to be strapped on the spooler of the cutting line itself or with the coils secured to the carriage, which slows down production.

Flejadora automática para bobinas cortadas de acero - Pisador de bandas - Saizar Strapping Machines SL

Strap, Strapping Head and types of sealing

We work with steel or polyester (PET) strap, in industrial widths of 16, 19, 25 and 32 mm.

The Strapping Heads are designed and manufactured in-house, covered by international patents. All adjustments are made via the HMI of the control desk.

  • Strapping Head for steel strap: sealed with linker by notching or by TIG welding points.
  • Strapping Head for polyester strap: sealed by friction-vibration.
  • Combined Strapping Head: alternates steel and PET strap, all in the same strapping machine.

Introduction of protectors and labels during the strapping

During the strapping process, the strapping machine can automatically insert corner protectors, seal area protectors and labels.

The corner protectors make sure the strapping is protected from the edges of the band of the slit coils. By inserting the protector into the sealing area, we ensure that the linker does not come into direct contact with the surface of the coil, thereby preventing its damage. By applying the label, each coil is identified for traceability, without any additional manual steps.

Flejadora automática para bobinas cortadas de acero - Introducción de protectores y etiquetas - Saizar Strapping Machines SL
Flejadora automática para bobinas cortadas de acero - Introducción de protectores y etiquetas - Saizar Strapping Machines SL

Integration with your longitudinal slitting line

The strapping machine is synchronized with the turnstile, the rammer, the unloading carriage, and other equipments of your production line.

We design it according to the different widths of the coil, the possible combinations of coils there could be on the turnstile arm and the available space.

When the performing of the circumferential strapping on the turnstile is finished, the cutting line and the carriage becomes available, which increases productivity and makes the work safer.

Benefits of automating the strapping of slit coils

Automating strapping at the end of the cutting line improves productivity, safety, and packaging quality.

The tips of the bands under control:
the rammer prevents them to loose during the strapping process and reduces the risk of dames

Repeatable strapping:
same tension and sealing in each coil, without depending on an operator

More security:
fewer manual task and greater safety away from the cutting line

Centralized control:
parámetros and functions from the control desk’s HMI

24/7 prepared:
robust design, Easy mantainance and spare parts directly from the manufacturer

More productivity:
the cutting line and the unloading carriage are cleared beforehand so that new coils can begin to be spooled on the line

Product ready for shipment:
protectors and labels are placed in the same strapping cycle

Flexibility:
individual coils or bundles, with steel or PET strap

Custom design:
the equipment adapts to your turnstile, your coil widths, and your available space

Proven experience:
more than 350 Automatic Strapping Machines sold and customers as ArcelorMittal, Thyssenkrupp, Tata Steel or Outokumpu

Contact our technical department for a customised solution

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What details do we need to determine your strapping machine

With this information, our technical department can prepare a tailored proposal:

  • Inner and outer diameters, width of each coil, and band thickness.
  • Number of coils per turnstile arm and their position regarding the arm.
  • Layout of the turnstile and the unloading carriage.
  • Type of strapping: circumferential, radial, or strapped to the coil bundle.
  • Desired strapping (steel or PET, width and thickness) and type of sealing.
  • Target productivity and the working cycle of the line.
  • Available space and photos of the facility and the final packaging of the coil.
Flejadora automática para bobinas cortadas de acero - Saizar Strapping Machines SL

Frequently asked questions

What is a slit coil?

Is the narrow coil produced after slitting a master coil on a slitting line. Each one must be strapped separately to prevent it from unrolling circumferentially.

Yes, the strapping machine applies the straps circumferentially with the coils in the turnstile, while the rammer secures the tips of the bands.

Secures the tips of the bands before and during the strapping, using slotted buttons that allows the strap to pass through. Prevents the tips to loosen and is not released until all strappings are made.

A shear that leaves all the tip sends in the same position. We also need data on the turnstile, the unloading carriage, and the coils to synchronize the movements.

It depends on the size of the coils, how they will be handled and transported, and your customer’s specific requirements. It’s common to combine several types; we’ll work with you to determine the best approach for each project. Typically, the various types of strapping mentioned above must be applied during the different stages of product handling and packaging, starting with circumferential strapping, followed by radial strapping, and finally strapping the bundle of slit coils. 

Yes, we group several coils into a bundle on a pallet, using spacers between the different coils, and apply radial strapping through the eye and/or transverse strapping, depending on the packaging you need.

We work with both, in widths from 16 to 32 mm. The choice depends on your packaging specifications, the type of coil to be strapped, etc.; with a combined strapping head, the same strapping machine alternates between steel and PET.

Yes, during the strapping process, corner protectors, linker protectors and labels can be automatically included.

Yes, we design the strapping machine and the rammer for your turnstile, your carriage and your available space for both new and existing production lines.

Yes, as manufacturers, we provide technical support and spare parts directly so that the strapping machine can operate 24/7.

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