The traditional raw materials for packaging paper primarily consist of plant fibers, such as wood pulp and recycled paper pulp.
The production process-centered on pulping and papermaking-encompasses various stages, including waste paper disintegration, screening, purification, thickening, refining, and sheet formation.
In 2025, Sun Paper received approval to construct a project with an annual output of 700,000 tons of high-grade packaging paper. Utilizing recycled paper pulp and commercial wood pulp as primary raw materials, the facility employs a production sequence involving waste paper disintegration, screening, purification, thickening, refining, and sheet formation. In the same year, the company's technical upgrade project for high-grade liquid packaging paper-boasting an annual capacity of 480,000 tons-successfully boosted production capacity by phasing out energy-intensive obsolete equipment and installing new refining machinery.
Innovative manufacturing processes-such as those for stone-based eco-friendly packaging materials-utilize calcite (calcium carbonate) as the core raw material. Combined with food-grade polypropylene (PP) and various additives, these materials are produced through physical processing techniques, including granulation and sheet extrusion.
The standard process for manufacturing packaging paper from recycled waste paper comprises four key stages: deinking, paper fiber purification, thickening, and papermaking.