How to use surface sizing agents

Category:

Product News

Release time:

Jan 29,2024

Surface sizing agents are chemicals that are used in the papermaking process to improve the surface properties of the paper. They are applied to the surface of the paper to enhance its strength, smoothness, water resistance, and printability. Here's how to use surface sizing agents effectively:

1. Choose the right surface sizing agent: There are various types of surface sizing agents available, including starch-based, synthetic-based, and protein-based agents. Select the agent that best suits your specific papermaking requirements.

2. Dilute the sizing agent: Surface sizing agents are typically supplied as concentrated solutions. Dilute the agent with water according to the recommended dosage provided by the manufacturer. The required concentration may vary depending on the type of paper and the desired effect.

3. Prepare the paper: Before applying the sizing agent, ensure that the paper is clean and free from any debris or contaminants. Trim the edges of the paper to remove any uneven or ragged edges.

4. Apply the sizing agent: There are different methods to apply surface sizing agents, including size press, spray, or curtain coating. The most common method is the size press, which involves passing the paper through a nip created by two rolls, with one roll partially immersed in the sizing agent. The sizing agent is transferred from the roll to the paper surface during this process.

5. Control the application: To achieve the desired effects, it is important to control the amount and uniformity of the sizing agent applied. This can be done by adjusting the speed of the paper, the pressure between the rolls, and the concentration of the sizing agent. Experimentation may be necessary to find the optimal settings for your specific paper and desired properties.

6. Dry the paper: After the application of the sizing agent, the paper needs to be dried to remove excess moisture. This can be done using a drying machine or by air drying in a controlled environment. Ensure that the drying process is sufficient to prevent any wrinkling or warping of the paper.

7. Test the paper properties: Once the paper is dried, test its surface properties to ensure that the desired effects have been achieved. Check for improvements in strength, smoothness, water resistance, and printability. Make adjustments to the application process if necessary.

8. Store and handle the paper: After the surface sizing process, store and handle the paper carefully to preserve its enhanced properties. Avoid exposure to moisture, extreme temperatures, and rough handling.

In conclusion, using surface sizing agents requires selecting the appropriate agent, diluting it to the recommended concentration, applying it to the paper using the appropriate method, and controlling the application and drying processes. Regular testing and adjustments are necessary to ensure the desired effects are achieved.

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