Factors in the Development of Fungus-Proof Barrier Materials. I. Treatments for Kraft Paper. II. Plastic and Asphalt Laminates.

摘要

Treatments for Kraft Paper: Six commercial fungicides were added to kraft paper and fungus resistance determined by soil burial and agar surface methods. Influence of aqueous leaching and storage at elevated temperature on fungus resistance of treated papers was determined. It was found that fungus resistance is dependent on the concentration per unit area of the sheet, not on concentration of fungicide per unit weight. A number of fungitoxic compounds were compared for protection provided paper. Effects of molds (originating from wood containers) on adjacent kraft paper or barrier material liners were investigated. Liners made of fungicidally treated paper remained in good condition even though growth was present on adjacent untreated wood surface. Untreated kraft paper or barrier material used to line treated wood boxes was not deteriorated. Asphalt and Plastic Laminates: Untreated kraft paper and kraft paper treated with fungicides were made into laminates with polyethylene and tested by soil burial and agar surface methods. The polyethylene layers had only a very slight effect on delaying or decreasing microbial attack on the untreated paper, but did aid in further inhibiting fungal deterioration of treated paper. If a fungicide was added to the asphalt but not the paper, there was complete protection against fungi even though no fungicide was added to the asphalt. (Author)