An economical wet end additive derived from gum containing fruits & seeds is rapidly absorbed by the fiber surface and bonds easily with other fibers & fines. It bonds cellulose molecules by taking the intermediate position i.e. it helps fiber to fiber bonding there by increasing strength properties and improving fiber inter bonding. DSA contains Galactomananas which replace or supplement the natural hemicelluloses in paper bonding. It gives considerable increase in BF of paper and other strength properties.

The pulping process, which is designed to remove lignin and thereby produce a fibrous cellulosic pulp, also removes a large part of the hemicelluloses normally present. These hemicelluloses, which are mostly mannans and xylans, could contribute greatly to the hydration properties of the pulp and the strength of the paper formed from the pulp. Galactomannans replace or supplement the natural hemicelluloses in paper bonding.

It is generally agreed that the hydrogen bonding effect is the major factor affecting the fiber-fiber bonding. An examination of the molecular structure of the gums reveals a rigid molecule with primary and secondary hydroxyl groups at all available positions and no nonpolar groups. In addition the single membered branches do not shield the available reactive hydroxyl groups. It is only the molecules present on the side chain those yield hydroxyl groups for hydrogen bonding.

DSA as a wet end additive would form better hydrogen bonding with pulp due to more availability of hydroxyl groups in comparison to guar gum. Such molecules are capable of bridging across and bonding to adjacent fibers and thus give better strength properties of the paper.

DSA has proved following advantages in paper making :

Improves fiber to fiber bonding.
           A) Better formation and fiber distribution
           B) Increase in BF and other strength properties
           C) Better glaze & stiffness
Retain fiber & fines and bonds them leading to better yield of fiber from the same Raw Material
Economical than other wet end additives
As viscosity is low freeness drop is comparatively less indicating less drainage resistance during sheet formation on paper machine

DSA 105A
DSA 106M
DSA Cationic