The following paperboard surface properties are involved in achieving good rub resistance: • absorption and drying (oil-based inks)
• smoothness
• surface strength (oil-based inks)
• surface pH (oil-based inks).
It is important that the coating pigments are well bound within the coating so that they do not separate from the coating as a result of any mechanical influence such as rubbing. For the same reason the coating’s own strength and adhesion to the baseboard are also important to ensure that the entire coating does not loosen from the baseboard.