GB/T 6847-1995 in English

《GB/T 6847-1995照相胶片和相纸卷曲度的测定》由TC102（全国感光材料标准化技术委员会）归口，主管部门为中国石油和化学工业联合会。
卷曲是照相胶片和相纸的一种基本性质，在许多应用中，它会影响满意地使用。高卷曲度会导致扩英放映和操作上的麻烦。本标准规定了散页状、卷筒状或条状照相胶片的相纸的显影加工前后的卷曲性能的测量和定量表达方法。本标准规定了三种测量方法：方法A是试样保持垂直时测量卷曲度的方法。方法B和C是试样处于水平位置时测量卷曲度的方法。由于试样的外形和尺寸的不同，三种测量方法的数值互不可比。三种方法都不能用于测定感光材料在冲洗和干燥过程中的卷曲性能。

Scope

This standard specifies the method for measuring and quantitatively expressing the curl properties of sheet, roll or strip photographic film and paper before and after development. This standard specifies three measurement methods: Method A is a method for measuring the degree of curl when the specimen is kept vertical. Methods B and C are methods for measuring curl when the specimen is in the horizontal position. Due to the difference in the shape and size of the sample, the values of the three measurement methods are not comparable to each other. None of the three methods can be used to determine the curl properties of photosensitive materials during processing and drying.