There are a wide variety of paper chemicals, Paper Making Chemical and the wetting composition of the paper machine is complicated. Therefore, when adding the wet chemical additives, the basic theory of surface chemistry and colloid chemistry is combined with the environment in which the chemicals are used according to the characteristics of the chemical itself and the environment used in the chemical industry. Out of the experience, to gradually explore; in the wet Department of papermaking problems, Paper Making Chemical but also according to these principles, and not blindly, free to add or remove chemicals.
In the selection of paper chemicals, the first use of chemicals and paper machine to do a comprehensive analysis of the basic situation, mainly to consider the following questions:
a. What is the role of the added chemicals? What are the chemical properties of the chemicals added?
b. What kind of pulp is used for paper machine production, Paper Making Chemical what is its characteristic? Conduct a survey of wet water systems;
c. some of the wet end of the process parameters, such as pH, wet system, cation demand, net white water concentration;
d. to consider the impact of the existing system on the existing system, the amount of added can be taken in a gradual increase in proportion; e. To consider the overall cost of the problem, find the best balance to add, if conditions are also recommended First in the laboratory to do a small test, Paper Making Chemical the amount of chemicals added and the use of conditions to explore and optimize;
The whole paper machine wet system is like a "black hole", it is complex, invisible and fragile, in the machine running for some time will reach a certain balance, Paper Making Chemical when the external conditions change, this balance will be broken, And cause a series of changes, the paper machine to bring the operation, so follow this idea, the operation of the wet machine and join the chemical given the following recommendations:
- to keep the paper machine system running smoothly, to meet the quality and copy the premise of minimizing the type and quantity of chemicals added;
- in the need to replace the new chemicals, Paper Making Chemical to take a gradual replacement method, to consider the new chemicals and the original system compatibility, the operation of the follow-up process have no effect;
- to follow the basic principles of papermaking, although the paper machine speed continues to improve, more advanced automation control, but some of the basic principles of papermaking operations have not changed, some copy of the parameters are basically unchanged, Paper Making Chemical need to keep in mind and resolutely implement strict process conditions, Such as the pH of the slurry, the pH of the system, the cationic demand and the zeta potential of the wet end (which reflects the change in the ratio of water, Paper Making Chemical slurry and different pulp used in the system) and the white water concentration Keep)
- to strengthen the wet end of the detection, data collection, collation and analysis, paper is a continuous process, in the long run there must be found. Paper Making Chemical Record the operation of the wet end of the paper machine at any time, for the follow-up problems to provide analysis and solve the problem of reference. Which is currently a considerable number of domestic enterprises do less than the place;