Abstract
An experimental study concerning the recycling of slightly crosslinked polyethylene foams produced in the manufacturing process was conducted. The recycled polyethylene (RPE) was blended with virgin low-density polyethylene (PE) and irradiated by electron-beams and expanded by heat to make regenerated foams. Four RPE/PE blends with different RPE contents ranging from 0 to 15 phr were foamed and the amount of blowing agent was varied in order to make foams of various densities. The mean cell size of the RPE/PE blend increased with an increase in the RPE content and the degree of anisotropy was generally higher for foams with larger RPE contents. The homogeneity of cell distribution and the type of cell distribution seem to be independent of the expansion ratio at a low RPE content. Furthermore, RPE/PE blends with 0∼5 phr of RPE were capable of producing good regenerated foams without losses of tensile and tear strength and other properties such as compression set, resiliency, dimensional change on heating, and Asker C hardness.
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