This study focuses on the sustainable development of the plastic industry under the background of China's "dual carbon" policy. Taking six plastic packaging enterprises of different sizes and types in Hengde Industrial Park, Hengshui City, Hebei Province as cases, it explores the practical effects of policies on enterprise production methods, technological innovation, market strategies, environmental performance, and financial impact. Research has found that the dual carbon policy promotes enterprises to accelerate equipment upgrades (such as introducing environmentally friendly production lines), raw material transformation (with a 30% utilization rate of biodegradable materials), and process improvement (low-temperature granulation recycling technology), but faces challenges such as high cost of biodegradable materials, bottlenecks in multi-layer composite technology, and lagging energy structure. Research has shown that policies have a significant impact on corporate finance (cost increases of 7% -8%, profit margins decrease of 10%), but government subsidies (such as a 30% subsidy for environmental protection equipment) and green procurement demand partially alleviate the pressure. Research reveals differentiation strategies: large enterprises rely on equipment investment and economies of scale to cope with policy pressures, while small and medium-sized enterprises rely on flexible outsourcing and cost control. Based on issues such as insufficient collaboration in the industrial chain and lagging technological research and development, this study suggests that the government strengthen research and development subsidies, promote the development of green standards, and enterprises need to strengthen industry university research cooperation and intelligent transformation. This study innovatively constructs a theoretical framework of "dual carbon policy enterprise response performance impact", breaking through the limitations of single theoretical research. It innovatively combines strategic management theory, sustainable development theory, and stakeholder theory to construct a comprehensive theoretical framework for analyzing the sustainable development of the plastic industry under China's dual carbon policy. It proposes a dual track strategy of "technology innovation subsidies+green supply chain collaboration", providing decision-making basis for the government to improve policy tools (such as differentiated carbon quotas) and enterprises to formulate transformation paths (such as intelligent production systems), filling the gap in micro enterprise behavior research at the regional level. The research results provide theoretical references and practical paths for the green transformation of the plastic industry.
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