基于烟草种植回收的农业地膜力学性能研究OA

Plastic film covers can retain heat and moisture,promoting the growth of tobacco seedlings,but failure to remove them in a timely manner will affect the subsequent growth of tobacco plants.Plastic film with good mechanical properties can reduce the damage rate during the recycling process and reduce the difficulty of recycling and reuse.This study designed experiments to investigate the mechanical properties of plastic film used in tobacco cultivation,including tensile properties,tear properties,and puncture-resistant properties,during the plastic film recovery process,based on the agronomic requirement of removing film 40 days after transplanting tobacco seedlings in Fujian Province.It explored the key factors affecting these mechanical properties and conducted multivariate linear regression and correlation analysis.The results showed that when the plastic film was stretched,it exhibited significant anisotropy.The weight of thickness on tensile force was 57.8%,and the weight of thickness on elongation at break was 49.3%.As thickness increased,tensile properties were significantly enhanced.The effect of stretching speed on tensile force and elongation at break was not significant.The weighting of the effect of changing the stretching direction from longitudinal to transverse on tensile strength was-31.6%,and the weighting of the effect on elongation at break was 27.8%.When the stretching direction was longitudinal,the tensile properties were better.When the plastic film was torn,the Spearman correlation coefficient between thickness and tear strength was 0.985,p<0.05,indicating that thickness and tear strength were strongly correlated.As thickness increased,tear resistance significantly improved.The Spearman correlation coefficient between tear speed and tear force was 0.104,p>0.05,indicating no strong correlation.When puncturing plastic film,thickness had a 91.2% influence on puncture force and a 78.5% influence on puncture strength.As thickness increased,puncture performance increased significantly.The effect of puncture direction on puncture force was not significant with p>0.05,indicating no significant difference.The results of this study could provide some reference for the design and optimization of tobacco plastic film recovery machines.