A Review on Research of Mechanized Residual Film Recovery Technologies and Equipment

Agricultural plastic mulch films have significantly increased crop yields but have also caused severe residual film pollution. This review summarizes the research progress in residual film recovery machinery, intelligent monitoring systems, film–impurity separation technologies, and resource utilization methods, while analyzing the advantages, limitations, and development trends of different technologies. Post-harvest recovery equipment has been widely applied due to its strong adaptability and broad application range, whereas seedling-stage and pre-sowing recovery technologies still require improvements in automation and environmental adaptability. Intelligent monitoring technologies can enhance the evaluation of recovery processes, but their application is restricted by complex field environments. Vibrating, pneumatic, and water-washing separation technologies exhibit advantages in processing capacity, film purity, and impurity removal, respectively. Recycled pelletizing and wood–plastic composites are important resource utilization pathways, but they still face challenges related to cost and performance. In the future, residual film management will develop toward intelligent, efficient, and high-value utilization.