Defoaming agent for paper making
May 13, 2024Defoaming agent for paper making is a chemical additive used to control foam during paper production. It can effectively reduce the generation and stability of foam, thereby improving production efficiency and product quality.
This article will introduce in detail how to correctly use defoaming agents for papermaking, and explain their functions and precautions.
1. Choose a suitable defoaming agent:
Select a suitable defoaming agent based on the paper production process and raw material characteristics. Common defoaming agents include silicones, fatty alcohols, polyethers, etc.
It is necessary to consider the alkali resistance, high temperature resistance, stability and other properties of the defoaming agent to ensure its effectiveness and safety during the production process.
2. Determine dosage:
Determine the amount of defoaming agent according to the type of production equipment, paper type and production process.
Generally speaking, the dosage of the defoaming agent is 0.05%-0.2% of the total weight of the pulp.
3. Add method:
A defoaming agent can be added directly to the pulp mixing tank, or sprayed in the pulp conveying pipeline.
To ensure that the defoaming agent is fully dispersed and dissolved, it can be diluted to a 5%-10% solution before adding it.
4. Control method:
During the production process, monitor the foam situation at any time and adjust the amount of defoaming agent as needed.
The defoaming effect can be evaluated and adjusted through indicators such as foam height, foam density, and foam duration.
5. Precautions:
Ensure the quality and purity of defoaming agents and avoid using expired or spoiled products.
When adding a defoaming agent, avoid reacting with other chemicals to avoid affecting its defoaming effect.
According to the conditions of the production equipment, adjust the adding method and time of the defoaming agent to ensure its full mixing and effect.
During use, pay attention to the feeding speed and uniformity of the defoaming agent to avoid local excess or deficiency.
6. Wastewater treatment:
Wastewater may contain a certain amount of defoaming agents, which need to be treated with appropriate treatment equipment to comply with environmental protection requirements.
7. Regular maintenance:
Regularly clean production equipment and pipelines to prevent defoaming agent residue and blockage.
Manage the storage and use environment of defoaming agents to avoid moisture, heat or contamination.
In summary, the correct use of papermaking defoaming agents can effectively control foam and improve production efficiency and product quality. However, during use, it is necessary to pay attention to issues such as the selection, dosage, addition method and environmental protection treatment of defoaming agents to ensure smooth production and environmental safety.