GREASE RESISTANCE OF CORN ZEIN COATED PAPER

The grease resistance of corn zein coated paper was measured as relate d to coating level, plasticizer addition and time. Overall grease resi stance ws normalized by time and expressed as percent area stained/hr (%AS.hr(-1)). For a 2.2 kg coating.ream(-1) of paper, %AS.hr(-1) was g reater than both unplasticized and plasticized 4.4 and 6.6 kg.ream(-1) coating levels (p<0.001). There was no difference in %AS.hr(-1) among 4.4 and 6.6 kg.ream(-1) zein coated and commercial polyethylene lamin ated paper (p:ME0.098). Plasticizer increased (p<0.001) and creasing h ad no effect (p=0.71) on %AS.hr(-1). Electron microscopy showed discon tinuities in zein coating at the 2.2 kg.ream(-1) level. The 4.4 and 6. 6 kg.ream(-1) levels showed uniform coatings.