Automatic Strapping Machine for steel coils

In SAIZAR we design and manufacture the Automatic Strapping Machines for steel coils in our facilities of Belauntza (Spain).

Each machine is custom designed: depending the size and weight of the coil, the position in which the coil arrives to the strapping station, the available space and the strap you require.

Since 2003 we develop our own manufacturing of Automatic Strapping Machines. In 2026 we reached our 350th sale, with our own internationally patented Strapping heads.

What is an Automatic Strapping Machine for coils?

An Automatic Strapping Machine of coils introduces the strap, places it around the coil and performs the tensioning, sealing and cutting of the strap, making the strapping automatically and without the intervention of an operator.

The Strapping Machine makes the complete cycle of the strapping: feeding of the strap, collection, tensioning, sealing and cutting of the strap.

As a result, we have a compacted, fastened and secured coil for its handling, storage and transport. From the control desk (HMI) Parameters are adjusted and all operations are managed.

Coil strapping types: radial, circumferential and combined

Coils can be strapped in different ways depending on the customer’s needs. The choice depends on the product, productivity, available space, and how the coil will be handled and transported.

Circumferential Strapping (OD)

The strap surrounds the Outer Diameter of the coil.

Its purpose is to secure the end or tip of the steel strap of the coil so that the coil does not open during handling.

The number of strappings to be made will depend on the dimensions and type of coil to be strapped; the machine can produce from a single strap up to the number required by the customer. In this case, the coil can be displaced to each of the strapping positions or alternatively, the strapping machine can be displaced along the entire width of the coil to perform the strapping at various positions.

Flejadora automática para bobinas de chapa de acero - Flejado circunferencial (OD) - Saizar Strapping Machines SL
Flejadora automática para bobinas de chapa de acero - Flejado radial a través del ojo (ID) - Saizar Strapping Machines SL

Radial strapping through the eye of the coil (ID)

The strap passes through the Inner Diameter (the eye) and secures the coil.

It keeps the coil’s wraps tightly bound together and reduces the risk of telescoping during transport.

Once again, the number of strappings depends on the customer’s needs, but for the strapping, a rotating system is required either for the coil or for the Automatic Strapping Machine so that the straps can be positioned in the correct positions.

Combined strapping

Circumferential and radial strappings are combined when the main objective is the maximum stability of the product, performing all the process at a single station.

This process can be performed with a single Strapping Machine that performs both types of strappings or with two individual Strapping Machines. The decision will be made depending on the productivity, available space and the customer’s needs.

Flejadora automática para bobinas de chapa de acero - Flejado combinado - Saizar Strapping Machines SL

Position of the coil: parallel eye or perpendicular to the transport

The position in which the coil arrives determines the design of the strapping station, the machine’s movement, positioning and required rotations.

Our Strapping Machines operate with the coil in a horizontal position, with the coil eye parallel or perpendicular to the transport direction. They can also operate with the coil in a vertical position (eye facing upwards), depending on the application.

The strapping can be done in a single station or at separate stations, depending the requirements of your process.

Flejadora automática para bobinas de chapa de acero - Flejado paralelo - Saizar Strapping Machines SL
Flejado con bobina en paralelo
Flejadora automática para bobinas de chapa de acero - Flejado perpendicular - Saizar Strapping Machines SL
Flejado con bobina en perpendicular

Polyester (PET) or steel strap

We manufacture Automatic Strapping Machines for steel strap, polyester (PET) strap or both types of straps in a single Strapping Machine.

Depending on the material of the coil, its weight, how the coil is expected to be transported and the temperature of the coil, one type of strap or another may be chosen, as well as the width of the strap.

For heavy applications or when the coils must be transported via many different transport modes and the coil may reach applications above 75ºC, the use of steel strap is recommended.

The strapping with steel strap can be sealed by notching, with linker (seal) or by TIG welding points. When the outer diameter of the coil has 800mm or less, sealing with linker (seal) is required. For all other diameters, any of the previously mentioned sealing methods can be used.

When the coil is not heavy, if it is a material that cannot be damaged, such as painted or aluminium coils, and their temperature is below 75ºC, polyester strap can be used. In that case the sealing system would be by friction-vibration.  

The width of the strap depends on the dimensions and weight of the coil, so the larger and heavier the coil, the wider must be the strap to be used in the Automatic Strapping Machine.

In 2008 we developed the first Strapping Machine capable of switching between steel or polyester strap of 32mm on the same machine.

Flejadora automática para bobinas de chapa de acero - Flejado con fleje de acero - Saizar Strapping Machines SL
Fleje de acero
Flejadora automática para bobinas de chapa de acero - Flejado con fleje de poliéster PET - Saizar Strapping Machines SL
Fleje de poliéster (PET)

SAIZAR Strapping heads and sealing types

The strapping head, is the most important part of the machine, which performs the following actions: strap feeding, pick up of the strap, tensioning, sealing and cutting of the strap.

In SAIZAR we design and manufacture our own strapping heads protected by international patents. All the adjustments can be made by the HMI.

The intelligent strapping heads of SAIZAR, can monitor the position of the strap at all times and pending on the requirements, automatically carry out several attempts at strapping.

On the steel strap we can find three types of sealing systems: by notching, with linker (seal) and by TIG welding points. Relating the polyester strap there is a single system, friction-vibration system.

For more information, see our pages of steel, polyester, and combination strapping heads.

Integration in your production line

An Automatic Strapping Machine when it is integrated into the Production line is more efficient.

We synchronize it with your transport system:  carriage, roller or chain conveyor and movable beams. Depending on the application, Protectors and labels can also be inserted automatically during the strapping process.

Do you also need to do the weighing, labeling or the wrapping of the coil? We will handle this as a turnkey project using our steel coil packaging lines.

Advantages of automating the strapping of coils

Automating the strapping improves safety on the production floor, the quality of the packaging and the regularity of production.

Repetable strapping:
same tension and seal on every strap, regardless of the operator

More security:
fewer manual tasks around heavy coils

Centraliced control:
parameters and operations from the HMI control desk

24/7 Prepared:
robust design and simple maintenance

Direct manufacturer:
our own strapping heads, spare parts and technical assistance without third parties

Coils that arrive stable to final destination:
with the circumferential and radial strapping of the coil, arrives at its destination in a more stable condition

Constant production rate:
fewer incidents and stops at the end of the line

Consumable flexibility:
steel, PET or both at the same machine

Tailored investment:
the equipment is designed for your coils, for your rate cycle and your available space

Proven experience:
over 350 automatic strapping equipments provided to various clients around the world

Contact our technical department for a customised solution

Contact

What information do we need to determine your strapping machine

With this information, our Technical Department can prepare a proper solution:

  • Weight and maximum temperature of the coil.
  • Inner and Outer Diameter of the coil, width of the coil and the width of the strap.
  • Transport position: the eye either in vertical or horizontal, in parallel or perpendicular position.
  • How the coil reaches the strapping station: carriage, movable beam or conveyor.
  • Whether the coil is equipped with a positioning and rotating system for each of the strapping positions or not.
  • Target productivity (coils per hour).
  • Desired strap (steel or PET and width of it), type of strapping and seal required.
  • Number of straps per coil.
  • Available space and photos showing how the strapped coil should look.
Flejadora automática para bobinas de chapa de acero - Flejado paralelo - Saizar Strapping Machines SL
Flejadora automática para bobinas de chapa de acero - Flejado perpendicular - Saizar Strapping Machines SL

Frequently asked questions

Which is the difference between strapping a coil radially or circumferentially?

The circumferential, strapping runs round the outer diameter of the coil and secures the end or tip of the strap. The radial strap passes through the inner diameter (coil eye) and binds the coils together, which reduces the risk of telescoping displacement. For maximum stability, both types of strapping are combined.

It depends on the weight, dimensions, transport and requirements of the customer. In most cases, each coil can have between 1 and 3 circumferential straps and between 2 and 4 radial straps. Nevertheless, we will work with you to determine the most suitable configuration for your product.

It depends on the temperature of the coil, its dimensions and weight, the type of material from which the coil is made, and the packaging specifications. PET strap is mainly used for cold coils, in-house handling and for delicate and lighter materials, whereas steel strap is used for high-temperature coils and heavy ones. If you need both, our combined strapping heads alternate between steel and PET strap on the same Automatic Strapping Machine.

With the steel strap we offer the sealing with linker (seal), by notching or with TIG welding points. With the polyester strap, the sealing is by friction-vibration. We’ll work with you to choose the right sealing system, based on the requirements of your product and your customers.

Yes, whether the coil’s eye arrives in parallel, perpendicular, or vertical position to the strapping station, determines the design of the strapping machine as well as its movements. We design the Automatic Strapping Machine based on how the coil is moved in your production facility.  

Yes, we will adjust it to your conveyors, carriages or movable beams, either in new or existing lines.

Depending on the application, you can automatically insert protectors and labels during the strapping process.

Yes, they are designed to operate 24 hours a day, 7 days a week, with a simple maintenance. As manufacturers, we provide you with spare parts and direct technical support.

In Belauntza (Gipuzkoa – Spain). We have a 1,500 m² production facility for cutting, welding, and machining, and another 3,500 m² facility for painting, installation, and commissioning.

Weight, dimensions and maximum temperature of the coil, transport position, productivity, type of strap, required type of strapping and available space. You can send it to us using the steel coil strapping form.

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