Introduction

Dry strength agent is a wet-end chemical for papermaking. Added to pulp, its polymer adsorbs between fibers to increase hydrogen bonding and improve the strength of dry paper (tensile strength, burst strength, internal bonding strength). It loses strength when exposed to water, which distinguishes it from wet strength agents.Main types: modified starch (most widely used), cationic PAM (high strengthening effect), CMC, etc.Applications: waste pulp and high-filler paper. It enables basis weight reduction, fewer web breaks and wood pulp saving. Mainly used for containerboard, corrugating medium and cultural paper.

Industry News

Waste paper recycling and lightweight packaging paper drive demand for dry strength agents. Domestic products are gradually replacing imports.Development trends: green bio-based additives; development of products resistant to anionic trash with combined retention and strengthening functions.Challenges: volatile raw material prices, waste pulp impurities reducing effectiveness, and severe homogeneous competition in the industry.