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Applications for rotational molding are being discovered everyday as molders, end users and designers creatively apply the benefits of the process to ever more challenging markets. The trend for these new applications is moving toward more demanding load bearing structures which are subjected to a wide range of environmental conditions. These more complex applications require careful considerations of load distribution and stress concentrations based on overall structural integrity. Consideration of environmental factors such as temperature, ultraviolet radiation and chemical exposure are critical to assure long term product performance in outdoor applications. Combinations of stress, temperature, and material degradation over extended periods of time present designers with an extremely challenging set of factors to analyze when designing rotationally molded products for the long term.
Designers are always challenged by the limited physical properties of polyethylene resins when designing rotationally molded parts. The chemical structure of polyethylene is one of the reasons it behaves the way it does. Polyethylene’s structure is comprised of long linear chains of repeating carbon and hydrogen atoms that resemble strings of pearls.