ISO 15755-1999 纸和纸板 杂质估算

标准号：ISO 15755-1999
中文标准名称：纸和纸板 杂质估算
英文标准名称：Paper and board - Estimation of contraries
标准类型：Y31
发布日期：1999/12/31 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：Y31
国际标准分类号：85.060
适用范围：This European Standard specifies the test method for the estimation by reflected light of the visible contraries in paper. Visual inspection is applicable to most kinds of paper and board. Paper and board with an apparently high content of contraries require to be inspected by instrumental means as described in Annex B, as the tedium of large counts diminishes the judges' precision. However, papers which are not flat, have a low lightness (Y value below 30 %) and contain holes may cause particular problems for instrumental techniques (see Annex B). Fluorescent spots will not be detected by the methods described in this European Standard.