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Characteristics of baking paper
Release time:
2023-04-26 20:18
1. Baking paper base paper and requirements
The base materials that can be used to produce baking paper are mainly three types of special paper, namely, parchment paper, translucent paper, and high tightness and smoothness superpressure sulfate pulp paper. The quality requirements include: ① high physical strength, able to withstand high temperature drying; ② Good dimensional stability to prevent shrinkage and deformation during post processing; ③ Uniform and consistent thickness; ④ High smoothness ensures continuity, flatness, and uniformity of coating; ⑤ Small surface absorption, reducing the consumption of stripping agent; ⑥ Good chemical compatibility to avoid interference from certain chemicals on the stripping agent.
3. Oil resistance
Baking paper needs to come into contact with oily substances for a long time during use, so it should prevent oil from penetrating from the contact surface with food to the contact surface with hands, which means it has oil resistance. Ways to improve oil resistance:
There are usually two methods to improve the oil resistance of paper through the papermaking process: one is to improve the beating degree of the pulp; The second is to use anti oil agents for treatment.
Oil repellents can be divided into two categories: fluorinated oil repellents and non fluorinated oil repellents. Perfluoroalkyl compounds used in papermaking can be mainly divided into three categories: perfluoroalkyl chromium complexes, perfluoroalkyl phosphate esters, and perfluoroalkyl copolymers. Non fluorinated oil repellents are mainly acrylic ester copolymers, which have not yet been widely used.
4. Temperature resistance
Due to the temperature limitations of baking cakes, biscuits, etc., baking paper is generally required to withstand a high temperature of 220 ℃ for 20 minutes. The main chain of organic silicon stripping agents is an inorganic Si-O bond, with a bond energy much greater than that of organic C-C and C-O bonds, which has good high-temperature resistance. Therefore, after coating the stripping agent on paper, it will change the temperature resistance of the paper.
5. Forming degree
The shaping degree of baking paper is mainly to meet the requirements for the use of cake cups. The average formability of bleached hardwood pulp paper is lower than that of bleached coniferous wood pulp paper. Adding fillers and calendering can reduce the formability of the paper. Increasing the beating degree and surface impregnation results in an upward trend in paper formability. And paper moisture is a good forming agent. Research has found that increasing the moisture content of the paper before calendering results in more residual moisture on the paper after calendering, resulting in better paper formability.
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