The invention relates to a paper printing method, in particular to a
food packaging paper printing method. According to the method, the
anthocyanidin of
lithospermum, Indian madder and purple perilla is extracted through an
ethanol acid
aqueous solution, the extracted solution is steamed and inspissated, till the
dry matter content reaches 45%,
starch is added into the extracted solution and stirred evenly, and a printing solution is obtained; the packaging paper is put into a
drying oven to be preheated, a convex printing plate is manufactured according to the printing image-text, the printing plate is arranged on a printing
machine, and the paper is placed under the convex printing plate to conduct printing;
infrared hot
air drying is conducted on the printed paper after the printed paper is flattened; the face, provided with the printed pattern, of the paper is evenly coated with
simethicone, and then
infrared hot
air drying is conducted on the paper; the face, provided with the printed pattern, of the paper is evenly coated with
plant resin, and then
infrared hot
air drying is conducted. According to the
food packaging paper printing method, the printing solution is obtained through the
pigment extracted from pure plants, the paper is preheated before printing is conducted, and the printing quality is improved; the paper generated after the
simethicone processing is conducted has good printing, folding and
adhesive characteristics and the like, and further has certain waterproof performance; after the
plant resin
processing is conducted, the manufactured paper can refresh the baked food, and the taste of the food is maintained.