What is pre-stretching?
Pre-stretching is a process where the palletizing stretch film is pre-stretched. It can replace the standard stretch film. Films for pre-stretch is extremely strong and resistant to tearing. The pre-stretched film fits snugly against the load and maintains its stretching force, thanks to which the load is always tight.
Why use Pre-stretch foil?
When the film stretches, its tensile strength increases considerably – it becomes twice as strong as it once passes its point of permanent deformation.
The memory of the film makes it want to return to his original form. But the more you stretch in advance, the more this memory decreases, which is why the double stretch does not work. When the film is placed effortlessly on the load, minutes later it is observed that it is stretched due to its elastic memory as it tries to return to its original state. It is precisely this film memory – like a ribbing around the wrist – is what distinguishes stretch films from other packing ways. The leakage observed during transport may cause loosening in other methods where the stretch film memory assumes this relaxation and continues to hold the load. It is this memory that is one of the most important reasons to use pre-stretched films.