Polypropylene Pop Quiz

• Use the lowest web tension settings that will maintain control over the web; a general recommendation for OPP is tensions of 0.25 to 0.50 lb./inch of film width.

• When drying the solvent from an ink or an adhesive coating, oven temperatures should not exceed 150°F to 170°F.

• To most effectively improve surface wetting and adhesion on OPP, bare-electrode corona treating systems should deliver an energy density of 2.4 watt-min/ft.2, while bare-roll systems need to be set at 4 watt-min./ft.2