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GB/T 19536-2004 English PDF (GBT19536-2004)

GB/T 19536-2004 English PDF (GBT19536-2004)

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GB/T 19536-2004: Plywood for container flooring

This Standard specifies definition, technical requirements, testing method, inspection rules, marking, packaging, transportation and storage of plywood for container flooring.
GB/T 19536-2004
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 79.060.10
B 70
Plywood for Container Flooring
ISSUED ON. JUNE 22, 2004
IMPLEMENTED ON. SEPTEMBER 15, 2004
Jointly Issued by. General Administration for Quality Supervision,
Inspection and Quarantine (AQSIQ);
Standardization Administration of China (SAC).
Table of Contents
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 5
4 Requirements ... 5
5 Test Methods ... 9
6 Inspection Rules ... 11
7 Marking, Packaging, Transportation and Storage ... 14
Foreword
Plywood for container flooring, as structural load-bearing material, is an important component for freight container. It acts as the functions of supporting and protecting cargo in container.
Anti-corrosion agent type and loading in the testing method of this Standard references to the requirements of "Cargo Containers. Quarantine Aspects and Procedures" (2001) issued by the Australian Quarantine and Inspection Service (AQIS).
This Standard was proposed by the State Forestry Bureau.
This Standard shall be under the jurisdiction of the National Technical Committee 198 on Wood-based Panels of Standardization Administration of China.
Responsible drafting organization of this Standard. Wood Products Research Institute of the Chinese Academy of Forestry.
Participating drafting organizations of this Standard. Xinhui Zhongji Container Wood Flooring Co., Ltd., Southern CIMC Containers Manufacture Co., Ltd., Zhejiang Deren Bamboo Technology Limited, Guangda Wood Industry (Shenzhen) Co., Ltd., and Henan Huanghe Forestry Limited.
Main drafting staffs of this Standard. Yang Fan, Lu Bin, Yaogu, Zhang Jie, Liu Yongdan, Guo Xibiao, Fan Chongzhen, and Ma Hong.
Plywood for Container Flooring
1 Scope
This Standard specifies definition, technical requirements, testing method, inspection rules, marking, packaging, transportation and storage of plywood for container flooring.
This Standard is applicable to general plywood for container flooring for general cargo, which is made of wood veneer, not surface-treated, and has corrosion protection function.
2 Normative References
The following documents contain provisions which, through reference in this text, constitute provisions of this Standard. For the dated references, the subsequent amendments (excluding corrigendum) or revisions of these publications do not apply. However, all parties coming to an agreement according to this Standard are encouraged to study whether the latest edition of these documents is applicable. For the undated references, the latest edition of the normative document is applicable to this Standard.
GB/T 2828.1-2003 Sampling procedures for inspection by attribute - Part1. Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection (ISO 2859-1. 1999, IDT)
GB/T 9846.2-2004 Plywood ?€? Part 2. Tolerances on dimensions
GB/T 9846.7-2004 Plywood - Part 7. Cutting of test specimens
GB/T 17657-1999 Test methods of evaluating the properties of wood-based panels and surface decorated wood-based panels
GB/T 19367.1-2003 Wood-based panels - Determination of thickness, width and length of boards
GB/T 19367.2-2003 Wood-based panels - Determination of squareness and
straightness of boards
"Cargo Containers. Quarantine Aspects and Procedures" (2001), Australian Quarantine and Inspection Service (AQIS) (2001)
4.6 Physiochemical properties
4.6.1 Physical and mechanical property shall meet the requirements of Table 3. Table 3 Physical Mechanical Property Index of Plywood For Container Flooring Inspection items Unit Index value
Static bending
strength
Along grain
MPa
???85.0
Cross grain ???35.0
Elastic modulus
Along grain
MPa
???10000
Cross grain ???3500
Density g/cm3 ???0.75
Moisture % ???12.0
Bonding strength of single specimen MPa ???1.70
Immersion de-cohesion -
The cumulative length of any unstuck
ply on each side does not exceed 1/3
the length of this ply (under 3mm is
not counted)
4.6.2 Anti-corrosion agent type and loading shall meet the requirements of "Cargo Containers. Quarantine Aspects and Procedures" (2001) issued by the Australian Quarantine and Inspection Service (AQIS).
5 Test Methods
5.1 Determination of Specification and dimension
5.1.1 Measurement of thickness, width and length shall comply with the
requirements of GB/T 19367.1-2003.
5.1.2 Measurement of edge straightness shall comply with the requirements of 5.2 and 6.2 in GB/T 19367.2-2003.
5.1.3 Measurement of diagonal line
Measure on two diagonal lines of the ply (board), accurate to 1mm.
The difference of the two diagonal lines measured is the diagonal length difference of the ply.
5.1.4 Warping measurement shall comply with the requirements of Appendix A in GB/T 9846.2-2004.
5.2 Preparation, Size and Quantity of Specimen
5.2.1 Size and quantity of specimens shall meet the requirements of Table 4. to 0.1%.
5.3.3 Determination of static bending strength and elastic modulus
The determination shall comply with the requirements of 4.9 in GB/T 17657-1999; Three specimens whose length direction is parallel (along the grain) or vertical (across to the grain) with outer ply fiber direction are cut respectively from each specimen board.
Static bending strengths along and cross the grain of the tested specimen are the arithmetic mean of the static bending strengths of three specimens with same grain direction, accurate to 0.1 MPa.
Elastic modulus along and cross the grain of the tested specimen are the arithmetic mean of the elastic modulus of three specimens with same grain direction, accurate to 10 MPa.
5.3.4 Bonding strength determination
The determination shall comply with the requirements of 4.15 in 17657-1999; and the processing conditions to the specimen shall meet the requirement of Category I glued wood.
5.3.5 Determination of immersion de-cohesion performance
The determination shall comply with the requirements of 4.17 in 17657-1999; and the processing conditions to the specimen shall meet the requirement of Category I glued wood.
6 Inspection Rules
6.1 Inspection Classification
Inspection of the products is divided into exit-factory inspection and type inspection. 6.1.1 Exit-factory inspection includes.
a) Appearance quality;
b) Specification / size;
c) Physical mechanical property inspection, including density, moisture content, static bending strength, elastic modulus, bonding strength and immersion de-cohesion.
6.1.2 Type inspection, except all items of exit-factory inspection, is added with anti-corrosion agent loading.
6.2.4 As for determination of physical chemical properties, the specimens shall be sampled randomly from each batch, and the sampled sheet number shall meet the requirements of Table 7.
Table 7 Physiochemical Properties Sampling Plan
Batch quantity range / sheet Sampled sheet number in primary inspection Sampled sheet number in
re-inspection
???1200
1201~3200
3201~10000
???10001
6.3 Judgment Rules
6.3.1 Test Result Judgment
6.3.1.1 If the average values of density, moisture content, static bending strength, and elastic modulus of the specimens for plywood for container flooring MEET the specified values, it is deemed that the glued wood of this batch has acceptable property; otherwise, if a certain item is not acceptable, new specimens may be re-sampled for re-inspection.
6.3.1.2 Judgment of bonding strength of specimens for plywood for container flooring. If the number of the specimens whose bonding strength index value meets the requirement is equal to or larger than 90% of number of effective specimens, it is deemed that this property of the glued wood in this batch is acceptable; if the number is less than 70%, it is deemed that they are disqualified. If the number of the specimens whose bonding strength meets the requirement is equal to or larger than 70% but less than 90%, new specimens may be re-sampled for re-inspection; if the re-inspection results show that the number of the specimens whose this property index value meets the requirement is equal to or larger than 90% of number of effective specimens, then it is deemed that this property of the glued wood in this batch is acceptable; otherwise, it is deemed that they are disqualified. 6.3.1.3 If the number of the specimens ( plywood for container flooring) acceptable in immersion de-cohesion performance is larger than or equal to 5, it is deemed that they are qualified (acceptable); otherwise, new specimens may be re-sampled for re-inspection.
6.3.1.4 If the anti-corrosion agent loading meets the requirement of "Cargo Containers. Quarantine Aspects and Procedures" (2001) issued by the Australian Quarantine and Inspection Service (AQIS), it is deemed that they are qualified (acceptable); otherwise, new specimens may be re-sampled for re-inspection. 6.3.2 Overall judgment
If appearance quality, specification/ size, physical mechanical property, anti-corrosion agent, and loading of the products all meet the corresponding requirements, they are deemed as acceptable; otherwise, they are deemed as unacceptable.
7 Marking, Packaging, Transportation and Storage
7.1 M...

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