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A Comprehensive Guide to Coil Banding
When your projects involve banding operations and equipment maintenance, storing or transporting materials, or other handling, it’s essential to use bands on metal coils to preserve shape.
Why is Coil Banding Essential?
Proper coil banding ensures steel or other materials are banded sufficiently and safely to minimize the risk of harm during the coils’ handling, storage, and transportation, and it saves clients time and effort.
Steel coil bands connect, stabilize, hold, or secure materials and prevent rolled metal from be loosing or undwind. They have high tensile strength and are ideal for transportation and storage. Our banded metal coils are made of steel for high strength and minimal stretch.
Banding Materials
We must establish procedures to ensure that the banding materials are suitable for the coil types and meet the specifications for the planned applications.
Steel Banding
Steel strapping is available in different steel grades, thicknesses, and widths, and it also comes with various surface treatments for corrosion protection. The selection of banding size and grade depends on the specific application. An adequate number of bands of the chosen dimensions, grade, and jointing method is essential to ensure the combined banding force is enough to keep the coil stable and safe.
Plastic Banding
Polypropylene and polyester banding are other options for steel banding in some applications. They can be used to secure packaging material to coils and as circumferential banding on very low-risk coils.
Steel Banding Joints
The weakest part of the banding system is the steel banding joints. It’s important to carefully consider the method and type of joint used when determining the number of bands needed to ensure the strength and safety of the coil. Three types of joints are most commonly used:
Seal joints
This is the ancient type of seal. The lower and upper steel straps are mechanically crimped several times.
Sealless joints
Sealless joints are created by punching through the overlapping ends of the strap and forming a mechanical joint. The punched joint effectively prevents the strapping from breaking.
Spot welded joints
Spot-welded joints must have at least 75% of the strap’s breaking strength. The equipment manufacturer determines the number of welds needed. The joint is created using an electric arc under inert gas, causing the metal to melt and the two overlapping straps to join.
Banding Requirements
As per the minimum packaging requirements, specific procedures must be established to ensure that the correct quantity and specification of banding materials are applied to coils at all stages of manufacturing, processing, and distribution. This is done to maintain the coils’ stability. Bands may be needed around the coil’s circumference to prevent it from becoming loose, and bands may also be required through the bore of the coil to avoid telescoping. The banding procedures should address any risk of unstable spring back coils during the banding process.
Banding Tools
Strapping tools apply tension, secure seals, and cut strapping to length. Various types of banding tools are available, including manual, automated, and electrically powered tools.
Coil Banding Process
The metal band must be firmly placed around the product roll and tightly tensioned in the banding process. Once the steel coil bands are adequately tensioned, the strap is firmly secured to itself.
Spring-back Coils
In spring-back coils, the length of the tail can greatly weaken the binding. Therefore, it’s important to ensure that the tail follows the radius of the coil as much as possible. This can be achieved by rotating the coil to ensure its weight compresses the tail to the coil.
Banding Tension
It is important to maintain the right tension in a steel band when making the joint. The ideal tension should be between 30% and 50% of the strap’s breaking strength. Too much tension can weaken the band, while too little tension can result in loose bands after handling the coil. Always refer to the manufacturer’s specifications and ensure that proper procedures are in place to ensure that jointing equipment and tools are used to achieve the correct tension level.
Quality Check
Visual checks should be carried out at all packing stages to allow workers to inspect the integrity of bands, joints, coil sizes, material conditions, and joint quality. Before applying packaging to the coil, a final inspection must be conducted to verify the correct number of bands.
Testing
Procedures for testing banding joints must be carried out to assess and record their physical strength. The testing frequency should be appropriate for usage and the results of joint failure.
Warning Label
To prevent coils from causing a spring-back risk, visible spring-back warning markings should be printed on the outer packaging.
Summary
Enze is a leading steel banding supplier in China. We offer a wide range of steel banding products, including stainless steel bands, clips, buckles, and tools. If you have inquiries, don’t hesitate to contact us.
