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Changes of Some Mechanical Properties of Different Low-Density Polyethylene (LDPE) Films during the Service Life

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Applied Engineering in Agriculture. 33(6): 913-918. (doi: 10.13031/aea.12434) @2017
Authors:   Nefise Yasemin Emekli, Kenan Büyüktas, Ali Basçetinçelik
Keywords:   Aging, Impact strength, Low-density polyethylene film, Mechanical properties, Tensile strength.

Abstract.

In this study, changes on some mechanical properties such as impact resistance, tensile strength, and elongation at break of the low density polyethylene (LDPE) greenhouse films produced by CO-EX technology were investigated under natural weathering conditions during their service life of 24 months. With multi-layered UV+IR+EVA and UV+IR+EVA+AF-added two different type greenhouse cover films were used as a material. For this purpose, a construction with a slope roof of 26.5° was used. Initially, the impact resistances of UV+IR+EVA and UV+IR+EVA+AF films were determined as 1161.4 and 1164.1 g, respectively. But at the end of 24 months, it was determined that the impact resistance of these films reduced as 45.5% and 38.8%, respectively. In addition, tensile strength of the films decreased by 3.5% and 8.5% and the value of elongation at break decreased by 14% and 12%, respectively, at the end of 24 months period. The results showed that the physical structure of the films changed from the elastic form to the fragile form at the end of product life depending on environmental conditions and aging. This situation is very important for all manufacturers who engaged in greenhouse cultivation in Antalya where the greenhouse cultivation is common.

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