How does packing with plastic strap compare to steel strap?

Packing with Plastic Strapping

When polypropylene (PP) and polyester (PET) plastic strapping were introduced for packaging, they quickly took the place of steel strapping in most applications. Steel strapping was only kept where no other material could do the job. As plastic strapping technology advanced, it opened up new ways to achieve more secure and efficient packaging. Below, we outline the main differences between these two types of strapping.

Key Differences Between Steel and Plastic Strapping

Steel strapping does not rely on elongation as a main property. On the other hand, plastic strapping can stretch more within a certain range. One of the most important features of plastic strapping is its ability to return to its original length after being stretched. When tension is applied, the question is how much the strap can recover from being stretched back to its starting shape.

A good example of switching from steel to plastic strapping is in securing wood loads. While steel strapping can handle heavier loads due to its higher strength, plastic strapping is better at returning to its original length after being stretched. This difference makes plastic strapping more effective in situations like this. Because of its elastic properties, plastic strapping is often a better fit for packaging wood, as it can adjust to changes in load better than steel, which is less elastic and does not stretch or recover as much. In summary, steel strapping is more likely to break or loosen during transport, which can leave goods unprotected. Steel can support more weight, but in many cases, the flexibility and recovery of plastic strapping are more important.

Moving from Steel to Plastic Strapping

Plastic strapping does not have as long a history as steel strapping, but advances in technology are speeding up the shift. With the development of modern strapping tools and new packaging solutions, plastic strapping is expected to fully replace steel in the near future. Most top manufacturers now agree that switching from steel to plastic strapping is becoming standard practice.

Understanding Elongation, Strap Tension, and Recovery

To fully understand these concepts, it’s important to know how strapping is used. Strap tension is the pulling force applied to the strap. As the strap is tightened, it stretches. The key question is whether the strap will return to its original length after being stretched. The elasticity of the strap is shown by the maximum point it can be stretched and still recover its shape—this is called the working range or endurance range of the strap.

More About the Working Range of PP and PET Plastic Strapping

The working range of strapping can vary a lot depending on the type. Each strap performs best within its own working range. This is the point where the strap can stretch the most while still being able to return to its original length.

More About the Elastic Recovery of PET and PP Plastic Strapping

How well a strap returns to its original shape depends on the material, the amount of tension applied, and how long the tension lasts. If the tension is only applied briefly, the strap is more likely to recover fully. If the tension is held for a longer time, the chance of the strap returning to its original state is reduced. Among the best options for maintaining shape after long periods of tension is straight plastic strapping.