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LY/T 1738-2020: Plywood for parquet
Status: Valid LY/T 1738: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| LY/T 1738-2020 | English | 229 |
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Plywood for parquet
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LY/T 1738-2020
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| LY/T 1738-2008 | English | 359 |
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Plywood for solid wood composite flooring
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LY/T 1738-2008
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PDF similar to LY/T 1738-2020
Basic data | Standard ID | LY/T 1738-2020 (LY/T1738-2020) | | Description (Translated English) | Plywood for parquet | | Sector / Industry | Forestry Industry Standard (Recommended) | | Classification of Chinese Standard | B70 | | Classification of International Standard | 79.060.10 | | Word Count Estimation | 10,196 | | Date of Issue | 2020-03-30 | | Date of Implementation | 2020-10-01 | | Older Standard (superseded by this standard) | LY/T 1738-2008 | | Regulation (derived from) | Announcement No. 6 of 2020 by the State Forestry and Grassland Bureau | | Issuing agency(ies) | State Forestry and Grassland Administration | LY/T 1738-2020: Plywood for parquet---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Plywood for parquet
ICS 79.060.10
B 70
LY
People's Republic of China Forestry Industry Standard
Replace LY/T 1738-2008
Plywood for parquet
2020-03-30 released
2020-10-01 implementation
Issued by the State Forestry and Grassland Administration
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard is a revision of LY/T 1738-2008 "Plywood for Solid Wood Composite Flooring". This standard is in line with LY/T 1738-2008
The main technical content changes are as follows.
--Added the definition of plywood for solid wood composite floor without formaldehyde;
--Modified the classification;
-Modified the specification and size deviation requirements;
-Deleted the requirements for needle knots, live knots, abnormal wood structure and other defects in the appearance quality;
-Deleted the bonding strength requirements in the physical and chemical properties;
--Modified the inspection method and requirements of formaldehyde emission;
-Modified the size and quantity of test pieces for dimensional stability testing;
--- Added a schematic diagram of sample sawing;
-Added sampling plan for appearance quality inspection and specification size deviation inspection;
-Modified the marking, packaging and transportation requirements.
Please note that certain contents of this document may involve patents. The issuing agency of this document is not responsible for identifying these patents.
This standard was proposed and managed by the National Wood-based Panel Standardization Technical Committee (SAC/TC 198).
Standard drafting unit. Research Institute of Wood Industry, Chinese Academy of Forestry, Wanhua Chemical Group Co., Ltd., Huzhou Hantai
Wood Co., Ltd., Anhui Yangzi Flooring Co., Ltd., Baroque Wood (Zhongshan) Co., Ltd., North American Maple Home Furnishing (Jiang
Su) Co., Ltd., Dehua Group Holding Co., Ltd., Fujian Qingxin Wood Industry Co., Ltd., Guangxi Daping Wood Industry Development Co., Ltd.,
Jilin Forest Industry Golden Bridge Flooring Group Co., Ltd., Jiangsu Kendia Wood Co., Ltd., Jiangsu Senmao Bamboo and Wood Co., Ltd., Linyi Youyou
Wood Industry Co., Ltd., Pu'er City Quality and Technical Supervision and Comprehensive Inspection Center, Shouguang City Luli Wood Industry Co., Ltd., Shuxiangmendi
(Shanghai) Meisei Home Furnishing Co., Ltd., Suzhou David Wood Co., Ltd., Hongmu Fang Home Furnishing Technology (Huzhou) Co., Ltd., Zhejiang
Jiangliangyou Wood Co., Ltd., Zhejiang Shenghua Yunfeng New Material Co., Ltd., Zhejiang Shiyou Wood Co., Ltd., Gaotang Lianfeng Wood
Co., Ltd., Wujiang District Inspection and Testing Center of Suzhou City, Yiyang City Product Quality Supervision and Inspection Institute, Xuzhou Huayu Wood Industry Co., Ltd.
The main drafters of this standard. Fu Yuejin, Chang Liang, Gong Cheng, Xu Jianfeng, Xu Jinmei, Lei Xiang, Lin Deying, Yu Guangming, Wu Zhenhua,
Yang Li, Lin Yongguang, Zhang Yanfei, Li Haixing, Liu Hailiang, Xu Guixue, Xu Mingfa, Li Yanxia, Bu Lixin, Jiang Wei, Zhang Chao, Ge Xiao
Hai, Pan Jinya, Ni Yuezhong, Zhang Tian, Liu Jiang, Cheng Shuilian, Jia Dongyu, Zhao Liyuan, You Jia, Jin Zhi, Wang Lu.
The previous versions of the standard replaced by this standard are as follows.
--LY/T 1738-2008.
Plywood for parquet
1 Scope
This standard specifies the terms and definitions, classification, requirements, inspection methods, inspection rules, and identification,
Packaging, transportation and storage, etc.
This standard applies to plywood for solid wood composite flooring.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated references, the latest version (including all amendments) applies to this document.
GB/T 2828.1-2012 Sampling Inspection Procedures by Attributes Part 1.Batch-by-batch Inspection Sampling Retrieved by Acceptance Quality Limit (AQL)
GB/T 9846-2015 ordinary plywood
GB/T 17657-2013 Test method for physical and chemical properties of wood-based panels and facing wood-based panels
GB/T 18103-2013 Solid wood composite floor
GB/T 18259-2018 Artificial board and its surface decoration terms
GB 18580 Formaldehyde release in artificial panels and products of indoor decoration materials
GB/T 19367-2009 Determination of the size of wood-based panels
3 Terms and definitions
The following terms and definitions defined in GB/T 18259-2018 apply to this document.
3.1
Plywood for solid wood composite floor made by veneer group blank and gluing.
3.2
The plywood for solid wood composite floor without adding any adhesive or auxiliary agent containing formaldehyde in the preparation process.
4 categories
4.1 According to the type of adhesive.
a) Formaldehyde-free added plywood for solid wood composite floor;
b) Plywood for solid wood composite floor with formaldehyde added.
4.2 Divided by use environment.
a) Type I plywood. used under outdoor conditions;
b) Type Ⅱ plywood. used in humid conditions.
5 requirements
5.1 Specification size deviation
The specification and size deviation of the plywood for solid wood composite floor shall meet the requirements of Table 1.
5.2 Appearance quality
The appearance quality of the plywood for solid wood composite floor should meet the requirements of Table 2.
5.3 Physical and chemical properties
The physical and chemical properties of the plywood for solid wood composite flooring should meet the requirements of Table 3.
6 Inspection method
6.1 Determination of size deviation
6.1.1 Length, width and thickness deviation
According to the provisions of GB/T 19367-2009 in 8.2 and 8.1.
6.1.2 Verticality and edge straightness
According to GB/T 19367-2009 in 8.3 and 8.4.
6.1.3 Warpage
According to the provisions of GB/T 19367-2009 in 8.5.
6.2 Determination of appearance quality
Carry out according to the provisions of 6.3.1 in GB/T 9846-2015.
6.3 Determination of physical and chemical properties
6.3.1 Method of sawing specimens and test pieces
6.3.1.1 Take three sets of 500mm×500mm samples from each plywood for solid wood composite flooring for testing, if the test panel is not enough
Take 3 sets of samples at a time, which can be selected from two plates.
6.3.1.2 The preparation position, size and quantity of the test piece shall be carried out in accordance with Table 4 and Figure 1.The length and width of the test piece should be perpendicular to each other, the size error
Must not exceed ±0.5mm.
6.3.1.3 When samples and test pieces are intercepted, material defects and processing defects that affect the accuracy of the test shall be avoided.
6.3.1.4 The formaldehyde emission sample can be taken separately, with a total surface area of 1m2.
6.3.1.5 If the size of the sample cannot meet the requirements of the sample preparation, the number of samples may be increased.
6.3.2 Water content
According to the provisions of 4.3 in GB/T 17657-2013.
6.3.3 Dimensional stability
According to GB/T 17657-2013 4.33 length change rate measurement regulations, of which 6 longitudinal and transverse specimens each, divided into two groups for adjustment
Wet treatment.
6.3.4 Dip peeling
Type Ⅰ plywood shall be carried out according to the provisions of 4.19.4.1a) in GB/T 17657-2013, and type Ⅱ plywood shall be carried out according to GB/T 18103-2013
In 6.3.2.
6.3.5 Bending strength and elastic modulus
According to GB/T 17657-2013, 4.7, the test piece needs to be balanced.
6.3.6 Formaldehyde emission
Carry out according to the regulations of formaldehyde emission determination in GB 18580.
7 Inspection rules
7.1 Inspection classification
7.1.1 Product inspection is divided into factory inspection and type inspection.
7.1.2 The factory inspection shall include the following items.
a) Specification and size deviation;
b) Appearance quality;
c) Water content and immersion peeling items in physical and chemical properties.
7.1.3 Type inspection includes all inspection items in specification and size deviation inspection, appearance quality inspection and physical and chemical properties. In the following situations
Temporarily, type inspection should be carried out.
a) When the raw and auxiliary materials and production process undergo major changes;
b) When production resumes after a long-term shutdown;
c) During normal production, the inspection should be no less than twice a year;
d) When the quality supervision department requests inspection.
7.2 Sampling method and determination principle
7.2.1 Appearance quality inspection
Adopt the one-shot sampling plan with the general inspection level in GB/T 2828.1-2012 as Ⅱ and the acceptance quality limit (AQL) as 4.0, which should meet
Table 5 stipulates.
7.2.2 Inspection of size deviation
Adopt a single sampling plan with a special inspection level of S-4 and an acceptance quality limit (AQL) of 6.5 in GB/T 2828.1-2012.
Comply with Table 6.
7.2.3 Physical and chemical performance inspection
7.2.3.1 Samples should be randomly selected from products stored for more than 72 hours after production. The sampling number of physical and chemical properties should meet the requirements of Table 7.
7.2.3.2 Judgment rules for physical and chemical properties
The arithmetic average of water content, static bending strength and elastic modulus in the physical and chemical performance indicators meets the requirements specified in 5.3, then the water content, static bending
The strength and elastic modulus are judged as qualified, otherwise it is judged as unqualified.
In the physical and chemical performance index, if all the specimens of immersion peeling meet the requirements specified in 5.3, the immersion peeling is judged as qualified, otherwise it is judged as unqualified.
In the physical and chemical performance indicators, the length of the longitudinal and transverse specimens with dimensional stability and relative humidity from 65% to 30% under the two sets of humidity conditioning treatments
The arithmetic average of relative change (shrinkage rate and expansion rate) and relative change in length (shrinkage rate and expansion rate) when the relative humidity is from 85% to 65%
All values meet the requirements specified in 5.3, the dimensional stability is judged as qualified, otherwise it is judged as unqualified.
The determination of formaldehyde emission is carried out in accordance with GB 18580.
In the physical and chemical performance test, if an indicator is unqualified in the initial inspection result, the indicator is allowed to be re-inspected once. When re-inspection, in the same batch
The number of samples in the product is doubled to re-inspect the unqualified items. If the re-inspection is qualified, it is judged as qualified, otherwise it is judged as unqualified.
7.3 Comprehensive judgment
When the size deviation, appearance quality and physical and chemical properties of the product meet the corresponding requirements, the batch of products is judged to be qualified; otherwise, it is judged as
Unqualified.
8 Identification, packaging, transportation and storage
8.1 Identification
The product or packaging should be marked. manufacturer’s name, address, product name, trademark, executive standard number, specification, category, grade, glue
Type of adhesive, formaldehyde emission label, number of sheets, production date, etc.
8.2 Packaging
When leaving the factory, it must be packaged separately according to different categories, specifications, grades, and batch numbers to prevent the board surface from being stained.
8.3 Transportation and storage
The products should be stacked flat during transportation and storage to prevent contamination, and should not be exposed to damp, rain or insolation.
During storage, they should be stacked separately according to category and specifications, and each stack should be marked accordingly.
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