PAM-type Ply Bond Strength agent “Himoloc MJ-450”

Abstract

High ply bond strength is required in combination board. Some kinds of starches are used as ply bond strength agents in spraying their suspension to the combined plies. Starchsuspension, without cooking, is sprayed, and the particles of starch are gelatinized in the drying process, large ply bond is occurred. But there are some problems such as putrefaction in using starches. Recently, synthesized ply bond strength agents have been used, for example poly acrylic amide type (PAM). Our company developed cationic dispersion PAM as retention aids and drainage aids for the first time in the world. Furthermore, we have developed anionic dispersion PAM, “Himoloc MJ-450”, as ply bond strength agent.“MJ-450” has great performance in small dosage because of its large particle size. The particle size of “MJ-450” is much the same as it of starches, and larger than it of the existing PAM. In this issue, we discuss the differences in the fixing mechanism of particles onto the ply between starches, existing PAM, and “MJ-450”.