| Green CellRTM foam is a biodegradable foam packaging material produced from a proprietary cornstarch blend. It is commercially available in a variety of laminations and constructions. Cushioning ability and thermal resistance (R-value) are fundamental properties needed to compete against synthetics. Since Green CellRTM foam is starch based and biodegradable, moisture is likely to affect its physical properties.Cushioning characteristics and the R-values of 1 and 2-inch foams were determined as a function of temperature and moisture content. ASTM method 1596 was used to determine the cushioning properties and an ice melt method was used to determine thermal resistance. Moisture sorption isotherms were developed at three temperatures (20°C, 25°C and 30°C) to determine its moisture sensitivity. One-inch foam had a lower G value at lower static stress than synthetic foams, but at higher static stress had higher G values, while two-inch foam had G values similar to that of synthetic foam materials. Dimensional changes were observed at higher relative humidity conditions especially at 30°C. The R-values at higher humidity were also less than that of synthetic materials. Biodegradable Packaging materials will find niche markets, as long as their properties are comparable to synthetic materials. Green CellRTM foam's hygroscopicity and its density need to be more controllable, then this would open the door for new market opportunities for this biodegradable foam manufactured from renewable resources. In the near, the farm may make a significant in the area of biobased Packaging Materials. |
