Production method of aluminum-free inner liner paper for cigarettes

The invention belongs to the papermaking technologies and relates to a production method of aluminum-free inner liner paper for cigarettes. The production method sequentially includes the steps of firstly, crushing wood pulp raw materials, and mixing with water to obtain paper pulp with the weight percentage being 4.0-8.0%; secondly, adding sulfuric acid and ethylenediamine tetraacetic acid into the paper pulp, and treating for 10-40 minutes; thirdly, washing to obtain the paper pulp with the weight percentage being 3.0-5.0%; fourthly, grinding the washed paper pulp; fifthly, performing papermaking, to be more specific, adding internal sizing agent alkyl ketene dimer and wet-strength agent polyamide epoxy resin; sixthly, performing surface sizing; seventhly, humidifying, performing press polish and rolling to obtain the aluminum-free inner liner paper. By the production method, the base paper which is soft, free of hair and powder falling, high in tightness, high in smoothness, low in heavy metal content and