1 Scope
This standard specifies the method for determination of dirt count of paper and board.
This standard is applicable to the determination of dirt count of all kinds of paper and board.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 450 Paper and board—Sampling for testing and identification of machine and cross direction wire side and felt side
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
dirt
fiber bundles and other impurities which are obviously different from the color of paper under any illumination angle
3.2
dirt count
number of dirt with a certain area per square meter of paper and board, or equivalent area of dirt per square meter of paper and board, expressed in mm2
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Apparatus
5 Sampling
6 Test procedures
7 Expression of results
8 Test report
Annex A (Normative) Standard dirt chart
