The quality of packaging doesn't just depend on the machine – the film also plays a crucial role. Choosing the wrong film risks tears, poor adhesion, or unnecessarily high material consumption. We explain the most important parameters.
Film thickness: 17 to 35 micrometers
Stretch films for wrapping machines are typically between 17 and 35 µm (micrometers) thick. As a rule of thumb:
– 17–20 µm: Light products, high throughput, maximum stretch desired
– 23–25 µm: Standard applications, good value for money
– 30–35 µm: Heavy or sharp-edged products, high mechanical stress
For wood profiles and furniture parts, 23 µm has proven to be the standard thickness. For sharp-edged metal profiles or pipes, 30 µm or more is recommended.
Film width and core diameter
The film width must match the machine. Horizontal wrappers like the Dynawrap series typically process films with a width of 100 to 170 mm, while pallet wrappers usually require 500 mm wide films. The core diameter is standard at 76 mm (3 inches) – this is the most common standard and compatible with most machines.
Pre-stretching: How to reduce film consumption
Modern wrapping machines have a pre-stretching unit that mechanically stretches the film before winding – often by 150 to 300%. This means that a film length of 1 m becomes up to 4 m of usable wrapping length through pre-stretching. This significantly reduces film consumption and material costs by up to 50%.
Machines with adjustable pre-stretching – such as most models of the Dynawrap Pro series or the Robopac Rotoplat – allow for individual adjustment to the product.
PE film (polyethylene) is the standard for most applications: inexpensive, highly stretchable, recyclable. PVC film is used less frequently but offers better cold stability and is used in the food industry. For wood and furniture applications, PE is always the right choice.
