Deposit control for soft water pulp and papermaking

Cartaspers PLH liquid is a single-product solution reducing contamination in papermaking machines and products

Specialty chemicals company Archroma have launched Cartaspers PLH liquid, a single-product enabling control of deposits, especially in soft water pulp and papermaking environments.

Currently, packaging and tissues machines lose the equivalent of 4% of their output per day due to machine contamination and sheet breaks caused by deposits.

These deposits, pitch and stickies, have a negative influence on paper quality and papermaking productivity. Pitch is made from natural resins and occurs in virgin pulp; stickies are found in recycled paper fibres.

They contribute to specks, holes in the sheet and printability issues, in addition to causing machine downtime and loss of productivity from cleaning time.

New Cartaspers PLH is an anionic pale yellow, low viscosity liquid that attracts non-polar (hydrophobic) substances like stickies and natural pitch.

It helps to passivate contamination and prevent agglomeration and deposition, without affecting cellulosic material. The organic additive performs across all water hardness levels and complies with food contact regulations such as BfR and FDA.

It eliminates the need for an inorganic absorbent and dispersant to control pitch in the pulping sector and reduces the need for cleaning agents. It has no foaming potential, which means that it maintains washing efficiency.

Compared to talc powder, the liquid is easier to handle as well as to disperse. Cartaspers PLH does not cause scale deposits in evaporators or contribute to ash content in finished pulp.

The liquid is suitable for use with brown stock and can be applied throughout the pulping process, as a washing aid or to passivate remaining particles in finished pulp.

In tests

Pulp mill tests already report easier application, better performance and significant cost savings compared to alternative deposit control systems. Customers who tested the liquid at two different pulping mills in Europe and Latin America reported better performance in soft water and significant cost savings. This is largely a result of the ability to use one, instead of three, deposit control products.

Recycled paper

Cartaspers PLH allows for a higher ratio of recycled paper in paper machine systems.

Andy Bell, Product Manager Barrier, Coatings and Deposit Control, said: “As the recycling of paper increases over the next five years so will the need for effective, cost-efficient deposit control across the industry.”

“We are pleased to lead the way with this solution particularly targeted at soft water environments.”