Pulp Paper Process - Geotube - Gowatersolve.com

WaterSolve’s product line offers you a very comprehensive product line to select the retention and drainage aid best suited for any particular application. We offer linear, branched, and cross-linked flocculant type polymers. These are available in cationic, anionic,and bead forms. They can be used alone (single retention system); in combination with organic coagulants i.e. polyDadmacs or polyamines (dual retention system) or Inorganic Coagulants such as Alum, Pacl, or Aluminum chloride, already present in the furnish; or in a micro-particle system.

These retention aids produce dense flocs which enhance entrapment of solids in the forming paper while minimizing bound water. The branched and cross-linked polymers are ideally suited for applications where high shear forces on the machine might tend to destroy the initial floc produced by less structured or lower molecular weight linear polymers.

Papermakers are increasingly using recycled fibers and furnishes with large amounts of refined pulp. This can have a negative impact on a paper’s dry strength properties, particularly tear and folding endurance, which are a function of fiber length. It also generates more fines which can adversely affect drainage and retention, leading to Scott cracking problems. Starches traditionally used to impart dry strength are now more often proving inadequate.

WaterSolve formulates a broad line of Cationic, Anionic, and amphoteric polymers which can be used alone or in combination with a crosslinked or one of our cationic promoters to enhance the dry strength properties of a wide variety of paper products. These resins act to increase the number, strength, and distribution of interfiber bonds, consistently producing paper with:

Increased burst and tensile strength
Improved Scott bond

Added at the wet end where they are absorbed onto the fibers, these resins form a flexible film under standard drying conditions that remains stable immediately upon drying. They can provide superior results in acid, alkaline, and neutral systems.

WaterSolve liquid cationic resins are wet-end additives specifically designed to impart wet strength to papers manufactured in the pH range of 4.5 to 6.5. Because they impart far more dry strength than other wet strength additives, they are also ideally suited for applications where improvements in both wet and dry strength are desirable. Typically, 90% of the total wet strength imparted by these resins is developed on the paper machine. Depending on the paper grade and exposure conditions, 2% to 30% of the initial wet strength will be lost after a 20 second soak period, and 50% in 16 hours. This temporary feature is especially beneficial in manufacturing tissue, toweling, and other personal care paper products. Moreover, these resins are superior to other competitive products in preserving the absorbency characteristics required for such products.

WaterSolve formulated products offer the following:

More opportunity to use low-cost furnishes
Reduced extent of pulp refining needed
faster repulping
improved machine runnability
Improved retention and drainage
Extended felt life
Easier changeover from wet strength to non-wet strength grades
Less foaming
Easier doctoring with less doctor blade wear
Improved creping with fewer creping breaks
Lower BOD and COD levels then with starch

WaterSolve’s liquid low molecular weight anionics increase permanent wet strength by improving fixation of PAAE resin (PolyAmidAmine Epichlorohydrine). It must be added in the wire pit or directly after PAAE injection at between 6-10% of PAAE (dry/dry).

Our dicyandinamide resins of highly cationic polymers enable standard anionic dyes to be fixed on fibers.

Anionic dispersed sizes, such as AKD and ASA, are not naturally substantive to paper fibers; so, sizing solutions are typically prepared with WaterSolve Coagulants. These coagulants reverse the charge of the rosin colloids making them substantive to the anionic fiber surface.

Many of the functional additives (e.g. starch, wet strength resins, sizing rosins, drainage aids, etc.) have cationic groups that enable their retention on the anionic fiber surfaces. Anionic colloids in the furnish e.g. from recirculated coated broke in thermo-chemical pulps; interfere with this process by capturing some of the cationic materials before they can interact with the fibers. WaterSolve offers, Low molecular weight, highly cationic polymers that are highly effective anionic trash collectors which act to prevent this problem by neutralizing the colloids, thus blocking their anionic sites from the cationic groups of the functional additives.

In tissue manufacturing, our products are excellent fiber dispersers during the formation of wet web adhesions.

WaterSolve offers softeners and release agents for use on the yankee dryer.