Sustainable kraft paper production from cocooning waste and recycled fibers for resource-efficient material utilization

The growing demand for packaging materials and the need for sustainable resource utilization require the development of alternative raw materials for paper production. This study investigates the use of fibrous waste generated during the cocooning process, together with recycled paper fibers, as supplementary raw materials in kraft paper production. The proposed technology aims to reduce the consumption of valuable cotton cellulose while improving the economic and environmental performance of paper manufacturing. Experimental studies were performed using cotton cellulose, secondary paper waste (MS-3A), and fibrous waste from cocooning processes. The fibrous waste was pretreated and cleaned under optimized conditions prior to incorporation into paper pulp. Kraft paper samples with different component ratios were prepared and evaluated for tensile strength, breaking length, bending resistance, thickness, density, and other physical and mechanical properties. The results demonstrate that the addition of cocoon-derived fibrous waste and recycled paper fibers can partially replace primary cellulose without significantly degrading paper properties. Improved mechanical characteristics were observed due to enhanced inter-fiber bonding associated with protein compounds such as fibroin and sericin, which contribute to additional hydrogen bonding within the fiber structure. The developed approach reduces raw material consumption and production costs while supporting the recycling of industrial waste materials. The proposed technology demonstrates the potential for sustainable kraft paper production by integrating primary and secondary fiber resources and may contribute to the manufacturing of environmentally efficient packaging materials.

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