How does packing with plastic strap differ from steel strap?

Packing with plastic strapping

The introduction of polypropylene (PP) and polyester (PET) plastic strapping for packaging purposes has led to these materials largely superseding steel strapping. This shift has been particularly notable in areas where steel banding was previously considered irreplaceable. The advancement of plastic strapping has opened up new opportunities for improved and more efficient packaging solutions. The distinctions between these two types of strapping are outlined below.

Key differences between steel and plastic strapping

Steel strapping is not characterised by significant elongation. In contrast, plastic strapping can stretch more within a certain range. A notable property of plastic strapping is its ability to revert to its original form after being stretched. Once tension has been applied, it is important to consider how much the strap can recover from its extended state.

The packaging of timber provides a good illustration of the move from steel to plastic strapping. While steel strapping is generally more robust for securing heavier items, plastic strapping stands out for its ability to regain its shape after being tensioned. This difference is crucial, making plastic strapping more suitable for applications such as timber packaging. Plastic strapping offers greater elasticity than steel, which, although elastic, does not stretch as much or return as effectively to its original length. In summary, steel strapping is more prone to breaking or loosening during transport, potentially leaving goods unprotected. Although steel can support heavier loads, in many situations, the flexibility of plastic strapping is a more significant advantage.

The shift from steel to plastic strapping

Plastic strapping is a more recent development compared to the long-standing use of steel strapping. However, technological progress is accelerating this transition. With the advent of advanced tools and innovative packaging methods, plastic strapping is expected to surpass steel strapping in the near future. Most leading manufacturers now acknowledge that switching from steel to plastic strapping is becoming standard practice.

Clarifying elongation, tension, and recovery capabilities

To fully grasp these concepts, it is important to understand the conditions under which strapping is used. Strap tension refers to the pulling force applied to the strap. As the strap is pulled, it stretches and elongates. The key question is whether it can return to its original length after being stretched. The elasticity of the strap is determined by the maximum extent to which it can be stretched and still recover its shape—this is often called the working range or endurance range of the strap.

Further details on the working range of PP and PET plastic strapping

The working range of strapping can vary significantly between different types. The best results are achieved when using a single type of strap, as this allows for the highest tension to be applied while still enabling the strap to return to its original form.

More information on the elasticity of PET and PP plastic strapping

The ability of a strap to return to its original shape is mainly influenced by the material, the amount of tension applied, and the duration of that tension. If the tension is only applied briefly, the strap is more likely to recover. However, if the tension is maintained for a longer period, the likelihood of the strap returning to its initial state decreases. Among the various options, straight plastic strapping is one of the best choices for retaining its original shape even after prolonged tension.