GB/T 41231-2021
General specification for moulded pallets with bamboo and wood particles (English Version)
- Standard No.
- GB/T 41231-2021
- Language
- Chinese, Available in English version
- Release Date
- 2021
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Latest
- GB/T 41231-2021
- Scope
- This document specifies the requirements, test methods, inspection rules and marking, packaging, transportation and storage requirements for molded pallets made of bamboo and wood shavings. This document applies to shaving molded pallets made of bamboo wood and its processing residues.
- Introduction
Analysis of the core content of the standard
This standard specifies the technical requirements for molded pallets made of bamboo wood processing residues, including 23 technical indicators in 4 categories, focusing on solving problems such as uneven strength and poor environmental protection of traditional wooden pallets.
Comparison of key technical indicators
Performance indicators Requirements for molded pallets Traditional wooden pallets Improvement range Compression performance of supporting legs ≥4000kg 2500-3000kg 33-60% Creep resistance ≤2.0 No clear standard - Formaldehyde emission ≤8mg/100g E1 level (≤9mg/100g) 11%
Key technical innovations
Breakthrough in structural design
Adopting the integrated manufacturing process of compression molding die (Appendix B) to achieve:
- Seamless connection between the support leg and the bearing surface
- Reinforcement rib distribution density increased by 40%
- Overall weight reduced by 15-20%
Material process optimization
Specify the wood shavings specifications (length 5-30mm, thickness 0.5-5mm) and moisture content (3-5%), and use with environmentally friendly adhesives to ensure:
- Internal bonding strength ≥ 0.6MPa
- Thickness expansion rate of water absorption ≤ 15%
Key points of testing methods
Special testing equipment
Innovative requirements of the standard are as follows:
- Pallet swing tester (Appendix C): Test the anti-breakage performance of the supporting legs (≥8000 times)
- Corner impact tester (Appendix D): Evaluate the impact resistance of the pallet corners (≥5 times)
Precision measurement specifications
Specifies 7 dimensional measurement methods, including 8-point thickness measurement method (spacing > 20cm) and metal wire edge straightness detection, to ensure that the shape and position deviation is ≤ 5mm/m.
Implementation suggestions
Production process control
- Molding temperature is controlled in the range of 160-180℃
- Pressure holding time is not less than 90 seconds
- Adopt online moisture content monitoring system
Key points of quality monitoring
- Compression and fork lifting performance of support legs must be tested for each batch
- Creep resistance verification is carried out every month
- Formaldehyde emission is tested by two parallel methods
GB/T 41231-2021 Referenced Document
- GB/T 17657-2013 Test methods of evaluating the properties of wood-based panels and surface decorated wood-based panels
- GB/T 22350-2017 Moulded plywood
- GB/T 2828.1-2012 Inspection procedure by count sampling part 1: Lot by lot inspection sampling plan retrieved by acceptance quality limit (AQL)
- GB/T 31291-2014 Standard for evaluation of duration of load and creep effects of wood and wood-based products
- GB/T 34394-2017 Maximum working load for flat pallets
- GB/T 3716-2000 Pallets for materials handling-Vocabulary
- GB/T 4996-2014 General-purpose flat pallets for through transit of goods.Test methods
GB/T 41231-2021 history
- 2021 GB/T 41231-2021 General specification for moulded pallets with bamboo and wood particles