Background: Burning temperature is one of the most important factors affecting the chemical structure of the smoke and the addition of reconstituted tobacco sheet to cut tobacco has been widely used by the tobacco industry to reduce the cost of cigarettes and the health risks of smoking.

Methods: A flame retardant film, made from chitosan and ammonium polyphosphate, has been coated on the surface of the reconstituted tobacco sheet substrate by Layer-by-Layer and spray coating techniques. The thermal degradation properties and flame retardancy of these reconstituted tobacco sheets were analyzed by TG-FTIR and micro-scale combustion calorimetry.

Results: It was found that the reconstituted tobacco sheet with the ratio of chitosan (5%) and ammonium polyphosphate (3%) film coating showed significant reductions in the peak heat release rate (50.7%), total heat release (35.8%) and the highest temperature in the temperature distribution diagram (77°C). The main gases released during the pyrolysis of these reconstituted tobacco sheet samples were H2O, CO2, CO, NH3, carbonyl compounds and the presence of film coating changed the formation of evolved volatile products and formed less gaseous products except NH3 during the thermal decomposition process.

Conclusion: The coating film can greatly enhance the char forming ability and reduce the flammability of reconstituted tobacco sheet, and therefore, reduce the health risks of smoking with the addition of these reconstituted tobacco sheets.

背景：燃烧温度是影响烟雾化学结构的最重要因素之一，为减少烟草成本和降低吸烟对健康的危害，烟草业已广泛使用添加重组烟草薄片来切割烟草。

方法：采用分层和喷涂技术，将壳聚糖和聚磷酸铵制成的阻燃膜涂覆在重构的烟草片基材的表面上。通过TG-FTIR和微型燃烧量热法分析了这些重构烟草片的热降解性能和阻燃性。

结果：发现以壳聚糖（5％）和聚磷酸铵（3％）薄膜包衣的比例制成的重组烟草片，峰值放热率（50.7％），总放热（35.8％）和温度分布图中的最高温度（77°C）。这些重构的烟草薄片样品在热解过程中释放的主要气体是H2O，CO2，CO，NH3，羰基化合物，并且薄膜涂层的存在改变了热分解过程中除NH3以外的挥发产物的形成和气态产物的形成。

结论：该涂膜可以大大增强成炭能力，降低再生烟草薄片的可燃性，因此，添加这些再生烟草薄片可以降低吸烟对健康的危害。