"In addition to their large availability, full biodegradability and non-ecotoxicity, protein-based materials have interesting barrier and moderate cost for food packaging applications. Gällstedt, Brottman, and Hedenqvist (2005), Han and Krochta (1999, 2001), studied the properties of whey protein coated paper. Soy protein isolate coated paper was found to impart gas and oil barrier as well as adequate mechanical properties for extending the shelf life of food products (Park et al., 2000; Rhim et al., 2006). "
"At 30% PEG concentration, HPMC coating on paper enhanced tearing resistance by 31% for 9 g/m 2 , 16% for 5 g/m 2 , and 13% for 3 g/m 2 , compared with that of the uncoated paper (433 ± 15 mN). The increases in tearing resistance arising from increases in coating weight reported in this study were consistent with the findings of Gällstedt et al. (2005) and Khwaldia (2010), who reported that increasing biopolymer coating weight increased tearing resistance and toughness of the paper. The tear index of paper, however, was not affected by HPMC coating (Sothornvit 2009). "
[Show abstract][Hide abstract] ABSTRACT: Hydroxypropyl methylcellulose (HPMC)-coated papers without plasticizer and plasticized with polyols were prepared, and the effects of coating weight, different plasticizers (glycerol (GLY), sorbitol (SOR), and polyethylene glycol (PEG)), and plasticizer contents (20% to 50%) on the physical and mechanical properties of the resulting biopolymer-coated papers were studied. Coating weight was the most important factor affecting mechanical properties. Conversely, increasing coating weight led to a decrease in gloss andto an increase in tensile strength (TS), elongation at break (%E), and tearing resistance of coated papers. The application of unplasticized HPMC coatings (3 g/m2) on paper reduced water vapor permeability (WVP) and water absorption capacity by 25% as compared with uncoated paper. All plasticizers significantly (p < 0.05) increased WVP and Cobb60 values of the films. With the exception of PEG, no effect was found with plasticizers on TS and %E ofcoated papers compared with those without plasticizer. HPMC-coated papers with PEG as a plasticizer showed significantly lower TS and higher %E and tearing resistance than the other plasticized films (p < 0.05). HPMC coating improved tensile properties and tearing resistance of paper and could be regarded as a reinforcement layer.
"From analysis of the isoresponse contours, it can be seen that the TS of coated papers increased with increasing the coating weight. These results are in accordance with those of Gällstedt et al. (2005) who reported that the TS increased with increasing coating weight for paper sheets coated with chitosan, whey protein isolate, whey protein concentrate , and wheat gluten protein. "
[Show abstract][Hide abstract] ABSTRACT: The effects of glycerol concentration and coating weight on biopolymer-coated paper properties were investigated using response surface methodology. Tests were run on the coated papers to determine water vapor barrier and mechanical properties. Coating weight was the most important parameter affecting water vapor permeability (WVP). Conversely, increasing coating weight led to a decrease in WVP and to an increase in tensile strength (TS) of the resulting coated papers. The papers coated with sodium caseinate (NaCAS) exhibited lower WVP values than those coated with other biopolymers. The TS of the papers coated with hydroxypropylmethylcellulose (HPMC) and chitosan was not affected by the glycerol concentration. HPMC-coated papers were higher in TS and %E than the other coated papers. For all types of coated paper, a maximum level of coating weight and level of glycerol concentration within range of 18.72–26.11% were found to be optimum for minimum WVP and maximum TS and %E.Highlights► Properties of coated papers are influenced by glycerol concentration and coating weight. ► Coating weight factor decreases water vapor permeability. ► Water vapor permeability is lowest for sodium caseinate-coated paper. ► Glycerol concentration has a positive influence on elongation values. ► Optimization of responses is performed by desirability function method.
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