GB/T 38711-2020 English PDF

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GB/T 38711-2020: Test method for reheating shrinkage of ultrathin glass - Laser method
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 38711-2020	119	Add to Cart	3 days	Test method for reheating shrinkage of ultrathin glass - Laser method	Valid

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Basic data

Standard ID: GB/T 38711-2020 (GB/T38711-2020)
Description (Translated English): Test method for reheating shrinkage of ultrathin glass - Laser method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: Q34
Classification of International Standard: 81.040.01
Word Count Estimation: 6,610
Date of Issue: 2020-03-31
Date of Implementation: 2021-02-01
Quoted Standard: GB/T 21389; GB/T 32639; GB/T 34171
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration
Summary: This standard specifies the terms and definitions, test equipment, environmental conditions, sample requirements, test procedures and result calculation, and test reports for the determination of the reheat shrinkage rate of ultra-thin glass by the laser method. This standard applies to the reheat shrinkage test of ultra-thin glass.

GB/T 38711-2020: Test method for reheating shrinkage of ultrathin glass - Laser method

---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.
Test method for reheating shrinkage of ultrathin glass - Laser method ICS 81.040.01 Q34 National Standards of People's Republic of China Test method for reheating shrinkage of ultra-thin glass Laser method 2020-03-31 released 2021-02-01 implementation State Administration for Market Regulation Issued by the National Standardization Management Committee

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard was proposed by the China Building Materials Federation. This standard is under the jurisdiction of the National Industrial Glass and Special Glass Standardization Technical Committee (SAC/TC447). Drafting organizations of this standard. Beijing University of Technology, Wuhu Dongxu Optoelectronics Technology Co., Ltd., Foshan Quality and Standardization Institute, China Construction Material Inspection and Certification Group Co., Ltd., Zhejiang Xixi Glass Co., Ltd., Zhejiang Xingxing Technology Co., Ltd., Jiangxi Voge Optoelectronics Co., Ltd. Co., Ltd., Bengbu Product Quality Supervision and Inspection Institute, Hebei Window Glass Co., Ltd., Dongxu Group Co., Ltd., Kelishi Materials Division Technology Co., Ltd. The main drafters of this standard. Tian Yingliang, Li Qing, Wang Wei, Yang Liuhui, Li Junjie, Wang Xianyu, Yi Weihua, Chen Min, Zhao Xingyong, Li Na, Zhang Xun, Han Zhengwei, Li Yantao, Li Zhen, Liang Xinhui, Wang Weilai. Test method for reheating shrinkage of ultra-thin glass Laser method

1 Scope

This standard specifies the terms and definitions, test equipment, environmental conditions, sample requirements, and Test procedure and result calculation, test report. This standard applies to the reheating shrinkage test of ultra-thin glass.

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 21389 Vernier, belt meter and digital caliper GB/T 32639 Terminology for flat panel display substrate glass GB/T 34171 Test method for bending properties of thin and ultra-thin glass three-point bending method

3 Terms and definitions

The following terms and definitions defined in GB/T 32639 and GB/T 34171 apply to this document. 3.1 Ultra-thin glass Flat glass products with a thickness of not more than 1.1mm. 3.2 Reheating shrinkage The glass sample is reheated and cooled according to a certain heating, heat preservation, and cooling process, and the glass structure is loosened and the size is relatively The rate of change of shrinkage from the original length.

4 Test device

The laser method test device is shown in Figure 1 and Figure 2.The device includes a quartz support, a heating furnace, a three-way adjustment platform for a rangefinder, and a laser sensor. The specific requirements of the test device are as follows. ---Laser sensor type. triangulation reflective; ---Laser sensor accuracy. 0.20μm; ---Laser sensor range. 0mm~1mm; ---Laser sensor linearity. ±0.05%; --- Furnace specifications. diameter is 50mm±10mm, length is 600mm±100mm; ---Heating temperature range. room temperature~1000℃; --- Heating rate. 1℃/min~20℃/min; ---Temperature control accuracy. ±1℃; ---Temperature field uniformity. ±3℃ (the same horizontal plane, the upper and lower parts of the sample heating zone); ---Sample loading force. 800mN; ---Internal friction resistance of linear bearing. ≤100mN.

5 Environmental conditions

The temperature fluctuation of the laboratory environment should not exceed 1℃, the recommended ambient temperature is 20℃±5℃, and the relative humidity should not exceed 60%.

6 Sample requirements

6.1 Shape and size The sample is required to be rectangular, and the recommended size is not less than 270mm in length, 20mm to 25mm in width, and the two end faces in the long direction are ground flat Polished, two sides are parallel and four corners are perpendicular. 6.2 Number of samples The number of samples is 2.

7 Test procedure and result calculation

7.1 Environmental placement The instrument device is placed on the marble countertop experiment table or shock-absorbing table, before the test, the sample is placed in the measurement environment for 1h. 7.2 Reference calibration Follow the steps below. a) Use the quartz calibration sample of the same material as the bracket and undergoing strict heat treatment, and its length and thickness are similar to the glass sample. b) Use a vernier caliper that meets the requirements of GB/T 21389 to measure the length L0 of the quartz calibration sample, and keep the result to 0.00001m. c) The quartz calibration sample is placed on the quartz holder and placed in the heating furnace. d) Compact the end of the quartz mandrel (in the furnace) on the end of the quartz calibration sample, and apply 80g counterweight. e) Adjust the three-way adjustment platform of the rangefinder so that the spot of the laser sensor is aligned with the outer end of the quartz ejector furnace. f) Adjust the front and rear positions of the three-way adjustment platform to make the laser sensor within the measuring range. g) Set the test temperature system, including parameters such as heating rate, holding temperature, holding time, and cooling rate. For example. heat up to the set holding temperature at a rate of 3℃/min (the holding temperature of different glass varieties is different, and it is recommended that the holding temperature ratio is The glass transition temperature Tg should be lower than 100℃), keep the temperature for 30min at the holding temperature, so that the glass is heated evenly, and then The temperature is lowered to.200°C at a rate of 3°C/min, and the measuring device is naturally cooled to room temperature. h) The measuring device loaded with the quartz calibration sample is allowed to stand for 30 minutes in the experimental environment. After the laser sensor shows a stable value, read and Record the value D0 of the laser sensor. i) According to step g) temperature system, heat, heat and cool the quartz calibration sample, and read and record after returning to room temperature for 2 hours The laser sensor shows the value D1. j) Calculate the reference correction value SJ of the reheating shrinkage rate of this device according to formula (1). 7.3 Sample test Test the glass sample according to 7.2.The measurement results of the two samples are recorded as S1 and S2 respectively, and the arithmetic mean SC is calculated according to formula (2). When the relative deviation is greater than 3%, samples should be prepared and tested again. 7.4 Calculation of results The total reheat shrinkage rate S of the glass sample is calculated according to formula (3).

8 Test report

The test report should include at least the following. a) According to the standard (the standard number); b) The name and type of the sample; c) The thickness and length of the sample; d) The number of samples; e) The initial temperature and end temperature of the test environment, and humidity; f) Heat treatment process system; g) test results; h) Inspector, reviewer, date; i) Other relevant information. ......

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