The cavity filter utilizes a homogeneous filling of pure activated carbon, as opposed to a fiber-blended model. By precisely controlling carbon particle size and packing density, it maximizes the purification efficiency of the adsorbent material. The ternary cavity activated carbon filter rod, used in Fujian China Tobacco’s “Septwolves (Oceanview Mid-size),” employs natural coconut shell activated carbon as its core. This design demonstrates a 30% higher adsorption efficiency for harmful substances like benzene and phenol compounds compared to traditional filters. Furthermore, the cavity structure regulates smoke flow velocity. After adsorbing harsh impurities, it eliminates the burnt, bitter taste in the middle-to-late stages of smoking. Such filters require the use of humidified activated carbon to maintain the cigarette’s moisture balance. They also demand strict control over magnetic impurity content in the carbon material to minimize equipment wear during production. Representing the “dual advantages” of high-efficiency harm reduction + taste optimization, this technology is prominently featured in mid-to-high-end cigarette products.
- Characteristic harmful solvents: substances such as benzene (benzene, toluene) and phenols (p-nitrophenol, resorcinol) that can easily affect the purity of flue gas, with a removal efficiency 30% higher than traditional filters, and can reduce the burnt and bitter taste caused by these substances;
- Volatile impurities: Trace solvents (such as ethanol and ethyl acetate) and flavor by-products remaining in tobacco processing are efficiently intercepted through the mesoporous structure of activated carbon;
- Partial heavy metal vapor: It has a certain adsorption capacity for volatile vapors of heavy metals such as mercury and lead produced by tobacco combustion, reducing their risk of entering the human body and avoiding wear and tear of equipment caused by residual magnetic substances.