NQB/T 5742-2022 atural color pulp
1 Scope
This document specifies the product classification, requirements, inspection rules, marking, packaging, transportation and storage of natural color pulp, and describes the corresponding test methods.
This document applies to the production, inspection and sale of natural color pulp used for manufacturing various types of papers, including packaging paper, household paper, cultural paper, specialty paper, etc.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions 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 451.1 Paper and board - Determination of size and deviation
GB/T 462 Paper, board and pulps - Determination of moisture content of analytical sample
GB/T 740 Pulps - Sampling for testing
GB/T 742 Fibrous raw material, pulp, paper and board - Determination of residue (ash) on ignition at 575 ℃ and 900 ℃
GB/T 2828.1 Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection
GB/T 3332 Pulps - Determination of beating degree (Schopper - Riegler method)
GB/T 7974 Paper, board and pulps - Measurement of diffuse blue reflectance factor - D65 brightness (Diff/Geometry, Outdoor daylight conditions)
GB/T 8940.2 Pulps - Preparation of laboratory sheets for the measurement of brightness
GB/T 8944.1 Pulps - Determination of saleable mass in lots - Part 1: Pulp baled in sheet form or pulps (such as flash-dried pulps) baled in slabs
GB/T 8944.2 Pulps - Determination of saleable mass in lots - Part 2: Unitized bales
GB/T 10740 Pulp - Estimation of dirt and shives
GB/T 22902 Pulps - Determination of acetone-soluble matter
GB/T 24323 Pulps - Laboratory sheets - Determination of physical properties
GB/T 24324 Pulps - Preparation of laboratory sheets for physical testing - Conventional sheet-former method
GB/T 24325 Pulps - Laboratory beating - Valley beater method
GB/T 24326 Pulps - Preparation of laboratory sheets for physical testing - Rapid-Köthen method
GB/T 29287 Pulps - Laboratory beating - PFI mill method
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
natural color pulp
pulp produced from virgin plant fibers through cooking, washing and screening, followed by light delignification treatment, resulting in a specific D65 brightness
4 Product classification
4.1 Natural color pulp can be classified by raw material type into natural color softwood pulp, natural color hardwood pulp, natural color reed pulp, natural color wheat straw pulp and natural color bamboo pulp.
4.2 Natural color bamboo pulp can be classified into high-grade products, first-grade products and acceptable products.
5 Requirements
5.1 Physical and chemical properties
5.1.1 The physical and chemical properties of natural color softwood pulp, natural color hardwood pulp, natural color reed pulp, natural color wheat straw pulp shall meet the requirements of Table 1.
Contents
Foreword I
1 Scope
2 Normative references
3 Terms and definitions
4 Product classification
5 Requirements
6 Test methods
7 Inspection rules
8 Marking, packaging, transportation and storage
