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A Study of Stress Development in Aqueous Gelatin Coatings

机译:明胶水性涂料中应力发展的研究

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A cantilever deflection technique was used to monitor stress during the drying of aqueous gelatin coaatings. Photographic-grade gelatin was dissolved in deionized water and coated, chilled, and dried. The final average in-plane tensile stress ranged from 0 to 50 MPa. Measrued stresses were independent of the coating thickness and initial solution concentration. At low relative humidity (0%) and low drying temperature (approx 20 deg C), the stress grew wiht time, reaching a constant average magnitude of 46 MPa. Raising the relative humidity above 0% or raising the temperature above 50 deg C changed the manner in which stress evolved. Stress rose to a peak value and then relaxed to a lower final value. Humidity affected stress evolution more than did temperature, within the limits of this work.
机译:悬臂偏转技术用于监测明胶水性涂料干燥过程中的应力。将照相级明胶溶解在去离子水中,然后涂布,冷却和干燥。最终平均面内拉伸应力为0至50 MPa。测得的应力与涂层厚度和初始溶液浓度无关。在较低的相对湿度(0%)和较低的干燥温度(约20摄氏度)下,应力随时间增长,达到恒定的平均压力46 MPa。将相对湿度提高到0%以上或将温度提高到50摄氏度以上会改变应力产生的方式。压力上升到峰值,然后放松到较低的最终值。在这项工作的范围内,湿度对应力的影响大于对温度的影响。

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