The papermaking industry is constantly seeking methods to improve efficiency, enhance product quality, and minimize environmental impact. One significant advancement has been the shift towards neutral pH sizing processes, primarily facilitated by chemicals like Alkyl Ketene Dimer (AKD). NINGBO INNO PHARMCHEM CO.,LTD. outlines the key advantages that neutral pH sizing with AKD brings to paper mills.

Traditionally, many papermaking processes relied on acidic conditions, often achieved through the use of rosin and alum for sizing. While this method provided water resistance, it came with several drawbacks. Acidic environments are corrosive to paper machinery, leading to increased wear and tear, higher maintenance costs, and a shorter lifespan for equipment. Furthermore, the acidity can degrade cellulose fibers over time, reducing the archival quality and durability of the paper itself.

The adoption of neutral pH sizing, typically ranging from 7.0 to 8.5, addresses these issues effectively. AKD is a prime example of a sizing agent that performs optimally within this pH range. The benefits are multifaceted:

1. Reduced Corrosion and Equipment Longevity: Operating at a neutral pH significantly reduces corrosion on paper machine components, such as wires, felts, and rolls. This leads to lower maintenance costs, less downtime for repairs, and extended equipment life. Manufacturers can invest in more durable machinery without the immediate concerns of acid-induced degradation.

2. Improved Paper Quality and Durability: AKD's chemical reaction with cellulose fibers creates a robust hydrophobic ester linkage. This results in a sizing effect that is not only effective but also more permanent and resistant to degradation over time. Papers produced using neutral AKD sizing often exhibit better aging characteristics, making them suitable for archival purposes and high-quality printing.

3. Enhanced Compatibility with Fillers: Modern papermaking often utilizes alkaline fillers like calcium carbonate (GCC) and precipitated calcium carbonate (PCC) to improve paper brightness, opacity, and printability, while also reducing costs. These fillers function best in neutral or alkaline conditions, making AKD an ideal sizing partner. Acidic sizing agents like rosin are incompatible with these alkaline fillers and can lead to processing issues.

4. Environmental Benefits: Neutral pH processes generally lead to more environmentally friendly operations. The effluent produced is less acidic, requiring less aggressive treatment. This reduces the chemical load on wastewater treatment systems and minimizes the overall environmental footprint of the paper mill. AKD's biodegradability further adds to its environmental appeal.

5. Better Machine Runnability: The absence of harsh acidic conditions and improved compatibility with fillers often translates to smoother machine runnability. Reduced deposits and better retention of fines and fillers can lead to a more stable and efficient papermaking process.

NINGBO INNO PHARMCHEM CO.,LTD. is dedicated to supporting the paper industry's transition towards more sustainable and efficient practices. By providing high-quality AKD sizing agents, we enable paper mills to harness the numerous advantages of neutral pH sizing, ultimately leading to better products, more efficient operations, and a reduced environmental impact.