Biodegradable Paper Sheet for Cigarette Filters

The patent uses a composite paper structure combining cellulose fibers with hydrophobic additives (such as colloidal silica, metal oxides, or organic compounds) to create a filter element that achieves both efficient filtration and rapid biodegradation. The hydrophobic additives modify the surface properties of the paper while maintaining its filtration capabilities and accelerating decomposition in the environment.

The patent modifies the physical and chemical parameters of paper by incorporating hydrophobic additives at specific concentrations (0.1-10% by weight) and controlling fiber characteristics (length, diameter, and composition) to optimize both biodegradation rate and filtration efficiency. The hydrophobicity parameter is specifically adjusted to balance environmental compatibility with smoke filtration performance.

The patent introduces hydrophobic additives as intermediary substances that mediate between the hydrophilic cellulose fibers and smoke constituents. These additives create a hydrophobic surface layer that selectively interacts with smoke components, preventing direct contact between water-soluble paper and harmful smoke substances, thereby improving taste quality while maintaining rapid biodegradation.

The patent incorporates hydrophobic additives during the paper formation process itself, rather than adding them separately afterward. The additives are mixed with the pulp slurry before forming the paper sheet, allowing uniform distribution and integration into the fiber network. This preliminary incorporation simplifies manufacturing by combining multiple steps into a single papermaking operation.