T/CNFPIA 3031-2023 Active

Scope: This document specifies the terms and definitions, technical requirements, inspection methods, inspection rules, and marking, packaging, transportation, and storage requirements for fine sawdust composite plywood. This document applies to the production, inspection, and trade of fine sawdust composite plywood used under dry conditions; Main technical content: 4. Technical requirements 4.1 Specifications and tolerances 4.1.1 Specifications dimensions The common format dimensions of fine sawdust composite plywood are 1220mm × 2440mm; the common thicknesses are 12mm, 15mm, 18mm, 20mm, 21mm, and 25mm, and other specifications are determined by mutual agreement between the supplier and the buyer. 4.1.2 Dimensional tolerances The dimensional tolerances of fine sawdust composite plywood shall comply with the requirements of Table 1. Table 1 Dimensional tolerance requirements No. Performance requirements 1 Dimensional tolerance Thickness (after sanding) Within and between boards/mm ±0.15 Length and width/mm/m ±1.5 with a maximum of 3.2 Edge straightness/mm/m ≤1.0 Verticality/mm/m ≤1.0 Flatness/mm/m ≤3.5 4.2 Appearance quality The surface of fine sawdust composite plywood shall be sanded, and the appearance quality after sanding shall comply with the requirements of Table 2 by grade. Table 2 Appearance quality requirements Defect name Allowable range Excellent grade Passing grade Delamination, bubbling, or carbonization on the surface Not allowed Broken marks, through cracks Not allowed Local softness Not allowed Edge defects Not allowed within the nominal dimensions Single area of contamination (e.g., adhesive stains, oil stains, wax stains) greater than 40mm2 on the surface Not allowed 1 through-and-through defect Not allowed Board edges 2 indentations allowed Side quality Single maximum width/mm of the top layer Not allowed 2 single maximum length as a percentage of the boar