Polypropylene Pop Quiz

Bruce Winter, technical marketing manager, Avery Dennison

Q: A line job currently printed on polypropylene is upgraded to four-color process. Will a new grade of polypropylene have to be specified?

A: If PP is top-coated it should be acceptable for four-color process with current inks. Converters have three options if polypropylene is non-top-coated: corona treatment on press; lay down primer on press; or buy top-coated face stock.