How many layers are enough?
In the securing of load units, stretch films fulfil the function of binding the packaged goods and the pallet together to form a robust "load unit". The goods on the pallet are thus protected against slipping, movement, coming apart and environmental influences during transportation or storage.
Since the introduction of pallet stretch films, the number layers in the composition of these films has been increasing steadily. While high performance films commonly have 3, 5 or 11 layers, films which are made up of more than 50 individual layers are now also available. These films are called "multi-layer or nano-layer film" and should allow for even better securing forces than standard high performance films with fewer layers.
In addition to the lack of a generally accepted definition of the terms "multi-layer" or "nano-layer", the real question also remains as yet unanswered:
Do films with ever more layers in the formulation also provide measurable added value in comparison with standard films with fewer layers? How many layers are enough?
As the world's leading manufacturer of stretch films, POLIFILM has addressed this question and compared stretch films with 11, 13 and 55 layers. In collaboration with SML Maschinengesellschaft mbH (Lenzig, Austria) and Dow Packaging & Speciality Plastics (Midland, USA), POLIFILM EXTRUSION GmbH produced three film types with different film thicknesses and provided them for a transparent practical test.
The surprising result was published in the 10/2017 issue of the magazine "Kunststoffe", the complete article on the topic can be found here: