Effect of primers and surface treatments on the gas barrier,mechanical,optical,printing,and flex-crack properties of the polyvinylidene chloride coated biaxially oriented polyethylene terephthalate films

This paper discusses a new method for development of transparent high barrier biaxially oriented polyethylene terephthalate film via offline coating method. In the present research, a more efficient coating method was employed which reduces the cost of the developed film by 30–35% and minimizes the energy consumption and saves the processing time of the film. Biaxially oriented polyethylene terephthalate film was corona treated or chemically coated during processing thus eliminating one process step. Further, biaxially oriented polyethylene terephthalate film was offline coated by polyvinylidene chloride dispersion for high barrier properties and then laminated with polyethylene. Processing parameters, polyvinylidene chloride coating formulations, and primer type were optimized based on the coating feasibility, laminate bond strength, barrier properties, and ink adhesion properties. Primer coating on biaxially oriented polyethylene terephthalate film substrate offers high laminate bond strength and improved ink adhesion. Polyvinylidene chloride coated biaxially oriented polyethylene terephthalate film has improved barrier properties compared to that of untreated biaxially oriented polyethylene terephthalate film. In polyvinylidene chloride coated biaxially oriented polyethylene terephthalate film, oxygen transmission rate value was observed as 6–7 cc/m²/day and water vapor transmission rate was observed as 3–4 g/m²/day.