Method for producing environment-friendly and high-resistance food wrapping paper

Abstract

The invention relates to the technical field of pulping and papermaking, in particular to a method for producing environment-friendly and high-resistance food wrapping paper. The method comprises the following steps: a layer of polyvinyl alcohol solution is applied to the surface of base paper; a layer of coating formed by constituents including polyvinyl alcohol, kaolin, modified starch, phosphoric acid and the like is applied after the layer of polyvinyl alcohol solution is dry; a layer of polyacrylic acid solution is applied eventually. The high-resistance food wrapping paper produced with the method has good water, oil and steam permeation prevention functions, and is efficiently and easily recovered by a paper mill, the yield of good pulp is larger than 85% after treatment such as pulping, pulp grinding, fluffing and the like, and good economic benefits and environmental benefits are achieved.

Description

technical field [0001] The invention belongs to the field of pulping and papermaking, and in particular relates to a production method of environment-friendly high-barrier food wrapping paper. Background technique [0002] High-barrier packaging materials are widely used in the field of food packaging, such as milk, soybean milk, fruit juice, tea drinks and other liquid food and beverages, instant noodles, instant rice noodles and other convenience foods, melon seeds, peanuts, popcorn and other snacks. The packaging of these foods needs to have Packaging material with high barrier properties. High-barrier packaging materials have the function of reducing or preventing moisture, oil, water vapor, oxygen and other substances from penetrating into the packaging, and can effectively block the impact of external environmental factors on the quality of internal food, thereby ensuring that the food maintains good quality and taste during the shelf life . [0003] A common high-ba...

AI Technical Summary

Problems solved by technology

However, when such packaging materials are recycled in pulp and paper mills, a large number of components cannot be used in the production of paper or cardboard: such as high molecular polyethylene and 5% aluminum foil accounting for 20% of the total weight of packaging materials; at the same time, During the waste paper treatment process, the polyethylene film and metal layer are broken into a large number of small fragments, which brings a heavy burden to the slag and sand removal of the pulp. Since these impurities are not removed cleanly, they often stick to the forming wire and felt. In addition, paper defects or even paper breaks are formed; moreover, due to the tight combination of the base paper matrix, the polymer and the metal layer, the high-quality plant fibers cannot be effectively separated during the pulping process, and a large number of fibers stick to the polymer. On the film, it is discharged together with plastic fragments when passing through the pressure screen and desander, which further affects the efficient recycling of plant fibers