CALEXIS® Strength Agent

Commercially proven and officially launched in 2009, the CALEXIS® family of strength agents has been developed for the wet end process of papermaking. CALEXIS, being an anionic macromolecule, is a very effective additive to improve the strength properties of the paper and board.

This increased strength potential can be used to save money through reducing refining energy, improving paper quality or increasing filler content. The improved strength of a CALEXIS system also offers the potential to use weaker or lower cost fibers.

The wet end is a complex dynamic system that is gaining increased attention as an area for improving efficiency, reducing effluent load and improving paper machine profitability. CALEXIS® Strength Agent is an additive designed to provide improvements in strength to allow paper and board producers multiple ways to improve economics, machine performance and end product benefits.

Improving Paper Strength

Through proprietary manufacturing techniques, CALEXIS improves paper strength by the following mechanisms.

  • CALEXIS increases the bonded area by forming bonds between fibers and other chemicals. The CALEXIS molecules set on the fiber surface, increasing the amount of active groups available.
  • CALEXIS disperses the micro fibrils increasing the specific bonding areas.
  • CALEXIS disperses and lubricates fibers, which leads to reduced frictional forces between the fibers. This leads to reduced floc size and therefore a better formation can be achieved.

The degree of effectiveness, however, depends upon correct CALEXIS product choice, which is dependent upon the individual paper and board making process, and the use of CP Kelco’s Wet End Analysis Tool.

Controlling Charge Balance

Due to its anionic nature, CALEXIS provides possibility for more efficient charge balance control.

Saving Refining Energy

When added before refining CALEXIS protects and dispersed the fibers improving the strength and uniformity of the refining result. Desired strength levels can be reached with less refining, as less damaged fibers provide better strength.

On-Machine and Quality Benefits:

  • Savings in refining energy
  • Improved retention of cationic additives
  • Maximized filler levels
  • Incorporation of weaker or cheaper fibers
  • Control charge balance to achieve desired runnability
  • Retention adjustment
  • Improved runnability
  • Less foaming (especially in the presence of PAE)
  • Minimal impact on COD/BOD