NINGBO INNO PHARMCHEM CO.,LTD. is committed to helping paper manufacturers achieve peak performance with our advanced chemical solutions. Alkyl Ketene Dimer (AKD) Wax is a powerful tool for enhancing paper properties, and understanding its optimal application is key. This article offers practical tips to master AKD sizing for superior water resistance and printability.

1. Precise Dosage Control: The effectiveness of AKD Wax is highly dependent on the dosage. While AKD is cost-effective, under-dosing will lead to inadequate sizing, resulting in poor water resistance and printability. Over-dosing can cause issues like increased foam or affect other paper properties. It's crucial to adhere to recommended dosage levels, typically specified in kilograms per ton of dry pulp, and adjust based on specific paper grades and desired outcomes. Consistent metering is vital.

2. Maintain Optimal pH: AKD performs best in a neutral to slightly alkaline pH range (typically 7.0-8.5). Deviating significantly from this can reduce sizing efficiency. Ensure your pulp slurry is correctly conditioned to this pH range before AKD application. This often involves careful use of buffering agents or alkaline chemicals.

3. Ensure Proper Emulsion Stability: AKD is supplied as a wax or emulsion. If using an emulsion, ensure it is stable and well-dispersed. Factors like storage temperature and shelf life are important. An unstable emulsion can lead to uneven application, resulting in patchy sizing and inconsistent performance. Follow manufacturer guidelines for emulsion preparation and handling.

4. Optimize Curing Conditions: The sizing effect of AKD develops over time and is accelerated by heat. The drying section of the paper machine plays a critical role in curing the AKD. Ensure adequate temperatures and drying times are maintained to allow the AKD to properly react with the cellulose fibers. Insufficient curing can lead to delayed sizing development or reversion, where the paper loses its water resistance over time.

5. Integration with Retention Aids: To maximize the efficiency of AKD and ensure good retention on the fibers, consider using appropriate retention aids. These chemicals help bind the AKD particles to the fibers, preventing them from being washed away in the water system. The choice of retention aid should be compatible with the AKD and other chemicals in the process.

6. Monitor and Test Regularly: Implement a robust quality control system. Regularly test the finished paper for water resistance (e.g., Cobb test) and printability. Monitoring these properties will help identify any deviations early on, allowing for prompt adjustments to the AKD application process. This continuous feedback loop is essential for maintaining consistent quality.

By following these tips, paper manufacturers can harness the full potential of AKD Wax, achieving superior water resistance and printability while maximizing cost-effectiveness and operational efficiency. NINGBO INNO PHARMCHEM CO.,LTD. is here to support you in mastering AKD sizing for your paper products.