One of the main auxiliaries is hot melt viscosity modifier. Its role is increase the colloid mobility, regulation of solidification rate, in order to achieve rapid firmly bonded to, otherwise, hot melt adhesive viscosity is too large, unable or flow is not easy, difficult to penetrate into the book in a manner worthy in go, can not be bonded firmly. When the softening point of softening point is low, it can achieve the purpose of good adhesion and adhesion. Paraffin wax, paraffin wax. Synthetic wax (PE or PP), futa wax.