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Compressive force is the energy a stretch film exerts onto the corners of a unit load of product, this paper analyzes the effects of compressive force overtime after application to a unit load. Previous research has shown how storage conditions, pallet configurations, and storage duration affect the performance of various packaging materials, however, there is a lack of this type of study relating to stretch film and load unitization. This paper looks at trends in compressive force depending on whether a film is applied with negative or positive secondary stretch. When a load is stretch wrapped with negative secondary stretch, meaning more feet of film than there is load perimeter than there is low compressive force on the corners of the load. Conversely, positive secondary stretch is when there is less film footage than there is perimeter of the load, so the film has to react and elongate in between the pre-stretch carriage and the load, applying greater compressive force at the corners. This study examined the effects of compressive force overtime using high-performance grades of both cast and blown stretch film. It was observed that the changes in compressive force varied depending on whether the film is applied to a load with positive or negative secondary stretch. A film application with positive secondary stretch will decrease in compressive force, while negative secondary stretch will increase slightly over time.
Wyns, Jake; Cook, John; and Dunno, Kyle
"Post-wrapping behavior of high-performance stretch film,"
Journal of Applied Packaging Research: Vol. 10:
3, Article 1.
Available at: https://repository.rit.edu/japr/vol10/iss3/1