The production process of plant-based parchment paper

The manufacturing of plant-based parchment involves a series of exquisite technological steps. First of all, it is necessary to carefully produce plant fiber base paper, which is the starting point of the entire process. Subsequently, the base paper will undergo a special "sheepskin" treatment. The key to this step lies in using sulfuric acid to alter the physical properties of the base paper.

The manufacturing process of base paper includes the long web forming of plant fibers, pressing, drying and winding, etc. In production, the A-cellulose content of the pulp fibers is of vital importance as it directly affects the bulk thickness, air permeability and absorbency of the base paper. However, an excessively high content of A-cellulose may lead to excessive absorption and reduced strength. Therefore, it is usually necessary to keep it below 96%. To ensure the quality of raw materials, high-quality materials such as cotton pulp and refined bleached sulfate wood pulp (including broadleaf wood pulp and coniferous wood pulp) are mostly used.

Plant-based parchment paper has extremely high requirements for the uniformity of the base paper. There must be no wrinkles, creases, pulp lumps or impurities to ensure transparency. For colored parchment paper, the dyeing process should be carried out when preparing the pulp in the wet end, and it is required that the dye be compatible with sulfuric acid and the dyeing be uniform. The basis weight range of base paper is usually set at 45 to 65gsm.