In the July/August 2011 issue of Folding Carton Industry magazine, an article regarding safety standards for food packaging caught my eye.

LD Davis sells three kinds of adhesives that are used in packaging. We manufacture liquid water-based adhesives, and hide glue (animal glue), and we distribute hot melt adhesives. 

Dextrin glue is liquid glue often used in the packaging industry. Think white glue in a bottle if you need a visual - although most dextrin glues are a translucent, amber color.