GB/T 20446-2022Wood moulding (English PDF)

Foreword

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

This document replaces GB/T 20446-2006 "Wooden Lines". Compared with GB/T 20446-2006, except for structural adjustments and editorial changes in addition, the main technical changes are as follows:

a) Changed the scope (see Chapter 1, Chapter 1 of the 2006 edition);

b) Modified normative references (see Chapter 2, Chapter 2 of the 2006 edition);

c) Changed the definition of wood lines, and added the definitions of finishing, plastering, cladding, solid wood lines, wood-based panels, and wood-plastic lines (See 3.1, 3.5~3.10, 3.1 of the 2006 edition);

d) The classification has been changed and the classification has been deleted (see Chapter 4, 4.1 and 4.2 of the 2006 edition);

e) The technical requirements were changed, the applicable tree species were deleted, the requirements for raw materials were added, and the requirements for appearance quality, processing accuracy and physical and chemical properties were changed. Seek (see 5.1, 5.3, 5.4, 5.1, 5.2, 5.4, 5.5 of the 2006 edition);

f) Deleted the tree species inspection, modified the appearance quality inspection, increased the preparation and size of the physical and chemical performance test pieces, and increased the water absorption thickness and swelling. Test methods for swelling ratio, dipping peeling, hardness, dimensional stability, paint film adhesion, color fastness to light (see 6.2, 6.3, 2006 edition 6.1, 6.4, 6.5);

g) Changed the inspection rules, added inspection classification, deleted the sign and determination of tree species name, sampling and determination of formaldehyde emission, inspection test report, adding physical and chemical properties test (see 7.1, 7.2.4, 7.2.5, 7.1.2, 7.1.6, 7.2, 7.3 of the 2006 edition).

1 Scope

This document specifies the classification, requirements, test methods, inspection rules and identification, packaging, transportation and storage of wood strips.

This document applies to lines processed from wood materials such as solid wood, wood-based panels, and wood-plastic materials.

2 Normative references

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

GB/T 1931-2009 Determination method of wood moisture content

GB/T 2828.1-2012 Counting Sampling Inspection Procedures Part 1: Lot-by-Lot Inspection Sampling Retrieved by Acceptance Quality Limit (AQL) plan

GB/T 3398.2-2008 Determination of hardness of plastics - Part 2: Rockwell hardness

GB/T 15036.2-2018 Solid Wood Flooring Part 2: Inspection Methods

GB/T 17657-2013 Test methods for physical and chemical properties of wood-based panels and veneer wood-based panels

GB/T 18259-2018 Terms for wood-based panels and their surface decoration

GB 18580 Limits of formaldehyde emission in wood-based panels and their products of interior decoration materials

GB/T 21140 Finger joint material for non-structural use

GB/T 39600 Wood-based panel and its product formaldehyde emission classification

3 Terms and Definitions

The terms and definitions defined in GB/T 18259-2018 and the following terms and definitions apply to this document.