Polyacrylamide-based Surface Strength Agents

Characterization of Polyacrylamide-based Surface Strength Agents

Abstract

Polyacrylamide (PAM) -based surface strength agents have been used jointly with starch or polyvinylalcohol (PVA) in the majority of cases. However, as a result of the rise in demand due to various efficiencies required for surface strength agents, PAM-based surface strength agents have been used individually. Individual use of PAM-based surface strength agents results in a couple of problems : firstly, the incompatibility with surface sizing agents ; and secondly the decrease in sizing effect at high concentration coating and with large quantities of pick-up solution.
PAM-based surface strength agents have been researched from various viewpoints, and It is confirmed that these problems are resulted from each agent inquiring into their performance and size efficacy is able to be preserved by controlling the hydrophilic ability of PAM-based surface strength agents.
Internal bond strength is one of performances required for surface strength. Internal bond strength is required to protect the blister resistance of coat paper, and the dust from a transverse section prevention of plain paper for copy paper, and high performance paper, and what not.
In this investigation, the penetration of PAM-based surface strength agent into base paper was examined by time-dependent attenuation of ultrasound transmission in PAM-based surface strength agent solution and researched correlation with the behavior of the internal bond strength. And the rise of the internal bond strength by surface application is effected greatly by the penetration of Pam-based surface strength agents solution into base paper. A slight difference of penetration on zero-sizing base paper has an influence on the penetration of PAM-based surface strength agents solution, and internal bond strength.