GB/T 26705-2023Low density printing paper (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.

This document replaces GB/T 26705-2011 "Light Printing Paper". Compared with GB/T 26705-2011, except for structural adjustment and editing In addition to the modifications, the main technical changes are as follows:

a) Changed the "bulk" index requirements, "D65 brightness" index name, "opacity" index requirements, "smoothness (positive)" of high-quality products. "Both sides)" index requirements, "Folding endurance (horizontal)" index requirements, "Ink absorbency (both sides)" index requirements and "Dust degree" Indicator requirements (see Table 1, Table 1 of the 2011 version);

b) Delete the "MIT method of folding endurance (transverse direction)" (see Table 1 of the 2011 version);

c) Changed the index requirements for "printing surface strength (both front and back)" (see Table 1, Table 1 of the 2011 edition) and test methods (see 6.10, 2011 version of 6.10);

d) Delete the "pH" indicator requirements (see Table 1 of the 2011 edition) and test methods (see 6.11 of the 2011 edition);

e) Added requirements for color difference deltaE of the same batch of light printing paper (see 5.4);

f) The inspection rules have been changed (see Chapter 7, Chapter 7 of the 2011 edition).

1 Scope

This document specifies the requirements, inspection rules, marking, packaging, transportation and storage of lightweight printing paper, describes the corresponding test methods, and gives Product classification is provided and corresponding terms and definitions are defined.

This document applies to the production, inspection and sales of lightweight printing paper used for printing textbooks, teaching materials, books, magazines, etc.

2 Normative reference documents

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document.

GB/T 147 Size of original paper for printing, writing and drawing

GB/T 450 Collection of paper and cardboard samples and measurement of longitudinal, transverse, front and back sides of the samples

GB/T 451.1 Determination of dimensions and deflection of paper and cardboard

GB/T 451.2 Determination of basis weight of paper and paperboard

GB/T 451.3 Determination of thickness of paper and cardboard

GB/T 456 Determination of smoothness of paper and cardboard (Buick method)

GB/T 457-2008 Determination of folding resistance of paper and cardboard

GB/T 459 Determination of stretchability of paper and cardboard

GB/T 462 Determination of moisture content of paper, cardboard and pulp analysis samples

GB/T 1540 Determination of water absorption of paper and cardboard - Cobb method

GB/T 1541 Determination of dustiness of paper and cardboard

GB/T 1543 Determination of opacity of paper and cardboard (paper backing) (diffuse reflectance method)

GB/T 2828.1 Enumeration sampling inspection procedures Part 1: Batch-by-batch inspection sampling plan retrieved by acceptance quality limit (AQL)

GB/T 7974 Determination of blue light diffuse reflection factor D65 brightness of paper, cardboard and pulp (diffuse/vertical method, outdoor daylight conditions)

GB/T 7975 Determination of color of paper and cardboard (diffuse reflectance method)

GB/T 10342 Paper packaging and marking

GB/T 10739 Standard atmospheric conditions for handling and testing of paper, paperboard and pulp samples

GB/T 12911 Determination of ink absorbency of paper and paperboard

GB/T 12914 Determination of tensile strength of paper and paperboard - Constant speed tensile method (20mm/min)

GB/T 22365-2008 Determination of printed surface strength of paper and cardboard

QB/T 1020 Standard ink for paper and cardboard printability test

3 Terms and definitions

The following terms and definitions apply to this document.