Study on the Variation of Mechanical Properties of Residual Plastic Film Over Time

\nThe mechanical properties of residual plastic film determine the recovery rate of residual film. The mechanical properties of residual film with a thickness of 0.01mm commonly used in the semi-arid region of northeastern China were tested at different laying times. The experimental results show that the tensile strength of residual film is inversely proportional to the laying time. After crop harvesting, the longer the residual film is exposed in the field, the more significant the decrease in its mechanical properties. From the first autumn harvest to the second spring sowing, the reduction coefficient of the tensile strength of residual film is 0.35. The concept of residual film tensile strength coefficient k has been proposed, and experimental data shows that the minimum value of residual film tensile strength coefficient is 65% of the maximum value. The residual film tensile strength coefficient has a significant impact on the picking rate of residual film pickups. This study can provide reference for the design, structural improvement, and optimization of operating parameters of residual film recycling machines.\n