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GB/T 35215-2017 English PDF

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GB/T 35215-2017: Standard methods for development of characteristic values of structural wood-based panels
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Basic data

Standard ID GB/T 35215-2017 (GB/T35215-2017)
Description (Translated English) Standard methods for development of characteristic values of structural wood-based panels
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard P23
Classification of International Standard 91.080.20
Word Count Estimation 10,174
Date of Issue 2017-12-29
Date of Implementation 2018-07-01
Regulation (derived from) National Standards Bulletin 2017 No. 32
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China

GB/T 35215-2017: Standard methods for development of characteristic values of structural wood-based panels


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Standard methods for development of characteristic values of structural wood-based panels ICS 91.080.20 P23 National Standards of People's Republic of China Method for Determining Eigenvalues of Structural Plywood 2017-12-29 Posted 2018-07-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China China National Standardization Administration released

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. Please note that some of this document may be patentable. The issuing agencies of this document do not bear the responsibility of identifying these patents. This standard proposed by the State Forestry Administration. This standard by the National Wood Standardization Technical Committee structure timber sub-technical committee (SAC/TC41/SC4) centralized. This standard was drafted by the Chinese Academy of Forestry Timber Industry Institute, China Forestry Research Institute of Forestry New Technology, Hubei Baoyuan Wood Co., Ltd., Southwest Forestry University, International Bamboo and Rattan Center, Manchuria Lianzhong Wood Co., Ltd. The main drafters of this standard. Ren Haiqing, Zhong Yong, Zhao Rongjun, Wang Zhaohui, Qiang Mingli, Wang Ge, Yuan Gongzhi, Lv Yi'an, Wang Xiuquan. Method for Determining Eigenvalues of Structural Plywood

1 Scope

This standard specifies the structural use of artificial board bending, tensile, compressive and shear (in-plane, out-plane) mechanical properties and density of eigenvalues to determine method. This standard applies to structural wood-based panels.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version applies to this article Pieces. For undated references, the latest edition (including all amendments) applies to this document. GB/T 17657 artificial board and decorative plywood physical and chemical properties of test methods GB/T 31264 Structural mechanical properties of plywood test methods

3 Terms and definitions

GB/T 31264 and defined by the following terms and definitions apply to this document. 3.1 Structural wood-based panel for structuralwood-basedpanels To bear for the purpose, the use of veneer, shavings and other wood, bamboo unit, through the drying, sizing, group blank, pressed into the structure of the plate Materials, including structural plywood, waffle shavings, OSB, etc. 3.2 Eigenvalues characteristicsvalues A certain quantile of probability distribution of performance of plywood with structural quality in accordance with the stipulated quality, and assuming that the probability distribution obeys normal distribution. This standard The criterion is to use the mean value of flexural modulus as its eigenvalue, and all others take the 5% quantile with a 75% confidence level for the corresponding statistical distribution of performance.

4 sampling

4.1 randomly selected according to the production batch of not less than 12 samples, each sample contains 4 sample plates, the test sample should be the same type, grade, Thickness and composition of the blank group composed of samples, and samples in this batch of products are representative. 4.2 From each sample plate interception bending, tensile, compressive, shear and density performance of a specimen. Specimens should be selected from the sample plate at different locations Take, and from the edge of the sample is not less than 50mm, Appendix A for each performance test specimen sampling sequence diagram.

5 specimen production

5.1 moisture content adjustment Should be at a temperature of 20 ℃ ± 2 ℃ and relative humidity of 65% ± 5% of the environment to achieve a constant mass, constant mass within 48h to Reduce the water content within ± 0.5% within 3 consecutive times. If the test environment is not consistent with the moisture content of the sample conditioning environment, the sample should always be Placed in the moisture content adjustment environment until the test.

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