Date of Award
Bachelor of Science
Paper Science and Engineering
Coating lubricants are commonly used in the folding boxboard industry to reduce dusting, improve gloss, increase dried coating flexibility, and modify coating slurry viscosity. Hot-melt adhesives are becoming increasingly popular among boxboard converters due to the strong bonds developed with very little set time. Very little is known about the interaction between the lubricants on the coating surface and adhesion developed with hot-melt adhesives.
In this study 100% recycled boxboard was coated on an air knife coater with a base coating and with 1%, 2%, 4%, and 8% calcium stearate and polyethylene glycol lubricants. The board was tested for Gardner gloss, water drop contact angle, static slip angle, and hot-melt glueability. Gloss results indicated a larger dependence on finishing conditions rather than lubricants. Static slip angle results were inconclusive. Contact angle and glueability testing indicated a possible relationship between increasing contact angle resulting in decreasing glueability.
O'Brien, James R. Jr., "The Effect of Coating Lubricants on Boxboard Hot-Melt Glueability" (1991). Paper Engineering Senior Theses. 448.