GB/T 6102.2-2012 English PDF (GBT6102.2-2012)

This Standard specifies the test method for moisture regain in raw cotton through the principle of the electrical resistance method. This Standard is applicable to raw cotton with moisture regain of 3% ~ 13%.

GB/T 6102.2-2012
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.060.10
B 32
Replacing GB/T 6102.2-2009
Test Method for Moisture Regain in Raw Cotton - Electrical
Resistance Meter
ISSUED ON: NOVEMBER 14, 2012
IMPLEMENTED ON: SEPTEMBER 1, 2013
Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 5
4 Principle ... 6
5 Technical Requirements of Instrument ... 6
6 Environmental Requirements ... 6
7 Detection Modes and Requirements ... 7
8 Detection Steps ... 7
9 Detection Results ... 7
10 Detection Report ... 7
Appendix A (normative) Technical Requirements and Steps of Detection with an Electrical Meter ... 8
Appendix B (normative) Technical Requirements and Steps of Detection with an Online Device ... 10
Appendix C (normative) Technical Requirements and Steps of Detection with an Insertion Device ... 11
Foreword
This Standard was drafted in accordance with the rules provided in GB/T 1.1-2009. This Standard serves as a replacement of GB/T 6102.2-2009 Test Method for Moisture Regain in Raw Cotton - Electrical Moisture Meter.
In comparison with GB/T 6102.2-2009, the main content of revision is as follows: ---The specific instrument measurement is classified as the principle measurement; “the test method for moisture regain in raw cotton through electrical meter” is modified into “the test method for moisture regain in raw cotton through the principle of electrical resistance method”.
---“GB 6975 Cotton Baling” is added to Normative References.
---“GB 1103” is modified into “GB 1103.1” in Normative References; “GB 1103.2” is added to Normative References.
---“GB/T 8170 Rules of Rounding off for Numerical Values & Expression and Judgement of Limiting Values” is modified in Normative References.
---The Scope of this Standard is modified into “raw cotton with moisture regain of 3% ~ 13%”.
---The definition of the measurement of moisture regain in raw cotton through the principle of the electrical resistance method is clarified. The “negative correlation” is clarified as “non-linear negative correlation”; the test condition “mass of specimen” is put into the “detection modes and requirements”; the step “perform temperature compensation” is added.
---The measurement voltage is modified from “DC (90  1) V” into “measurement voltage: less than 100 V (DC). The maximum allowable error: less than 50 V (DC), less than  4% of the rated value; 50 V ~ 100 V (DC), less than  1.5% of the rated value”. ---The “test sample” is modified into “detection modes and requirements”. In addition, “electrical meter detection: the sampling size and method shall comply with the stipulations of GB 1103.1, GB 1103.2 and GB 19635. Online device detection: applicable to Type I saw ginned cotton specified in GB 6975; in the process of baling, the bale is not opened for fixed-point inspection; the measurement depth shall be 1 cm ~ 5 cm. Insertion device detection: applicable to Type I saw ginned cotton; after bailing, the bale is not opened for fixed-point inspection; the test point shall be 10 cm ~ 15 cm inward from the outer layer of the cotton bale” is clarified.
---The “test results” is modified into “detection results”. In addition, “electrical meter detection: in accordance with the sampling size specified in GB 1103.1, GB 1103.2 and Test Method for Moisture Regain in Raw Cotton - Electrical
Resistance Meter
1 Scope
This Standard specifies the test method for moisture regain in raw cotton through the principle of the electrical resistance method.
This Standard is applicable to raw cotton with moisture regain of 3% ~ 13%. 2 Normative References
The following documents are indispensable to the application of this document. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document.
GB 1103.1 Cotton - Part 1: Saw Ginned Upland Cotton
GB 1103.2 Cotton - Part 2: Roller Ginned Upland Cotton
GB 6975 Cotton Baling
GB/T 8170 Rules of Rounding of for Numerical Values & Expression and Judgement of Limiting Values
GB 19635 Cotton - Sea Island Cotton
3 Terms and Definitions
The following terms and definitions are applicable to this document.
3.1 Moisture Weight
Moisture weight refers to the weight of raw cotton when it contains moisture. 3.2 Dry Weight
Dry weight refers to the weight of raw cotton after removing moisture through a certain method. 3.3 Moisture Regain
Moisture regain refers to the difference between the moisture weight and the dry weight of the 7 Detection Modes and Requirements
7.1 Electrical meter detection: the sampling size and method shall comply with the stipulations of GB 1103.1, GB 1103.2 and GB 19635.
7.2 Online device detection: applicable to Type I saw ginned cotton specified in GB 6975; in the process of baling, the bale is not opened for fixed-point inspection; the measurement depth shall be 1 cm ~ 5 cm.
7.3 Insertion device detection: applicable to Type I saw ginned cotton specified in GB 6975; after bailing, the bale is not opened for fixed-point inspection; the test point shall be 10 cm ~ 15 cm inward from the outer layer of the cotton bale.
8 Detection Steps
See the detection steps in Appendix A, Appendix B and Appendix C.
9 Detection Results
9.1 Electrical meter detection: in accordance with the sampling size specified in GB 1103.1, GB 1103.2 and GB 19635, perform the detection piece by piece, record the detection results, then, calculate the arithmetic mean of moisture regain of batch samples and take it as the detection result.
9.2 Online device detection: issue the detection results of moisture regain bale by bale. 9.3 Insertion device detection: for the bale-by-bale detection, issue the detection results of moisture regain bale by bale; for the detection by batches, in accordance with the sampling size specified in GB 1103.1, GB 1103.2 and GB 19635, perform the detection bale by bale, record the detection results, then, calculate the arithmetic mean of moisture regain of batch samples and take it as the detection result.
9.4 The detection results shall be rounded off to one decimal place in accordance with GB/T 8170.
10 Detection Report
In accordance with the requirements of different detection instruments, issue the detection report on moisture regain. The content of the report includes: moisture regain or average moisture regain, quantity of test specimens, sample source, sample No., cotton type, rolling mode, inspection basis, instrument type, detection date, and temperature and humidity of detection environment, etc.
Appendix A
(normative)
Technical Requirements and Steps of Detection with an Electrical Meter
A.1 Technical Requirements
A.1.1 Plate area: (235  100) mm2.
A.1.2 Plate pressure: (735  30) N.
A.1.3 Mass of specimen: (50  5) g.
A.1.4 Environmental adaptability
temperature of operating environment:  30 C ~ + 50 C.
when the moisture regain of the specimen is below 5.0%, the relative humidity of the environment shall be  30%;
when the moisture regain of the specimen is 5.0% ~ 7.0%, the relative humidity of the environment shall be  65%;
when the moisture regain of the specimen is 7.0% ~ 13.0%, the relative humidity of the environment shall be  85%.
A.2 Detection Steps
A.2.1 Instrument calibration: in accordance with the metrological verification procedures, calibrate the instrument.
A.2.2 Sampling: the sampling size and method shall comply with the stipulations of GB 1103.1, GB 1103.2 and GB 19635, or the methods negotiated by the parties concerned. A.2.3 Sample processing: during the on-site inspection, the test can be performed while taking the sample. For the samples tested in the laboratory, the obtained samples, together with the sample container, shall be placed in the test environment for temperature balance, so that the temperature difference with the environment is within  2 C. From the time of obtaining the sample, the test of the moisture regain shall be completed within 24 h. A.2.4 Instrument adjustment: in accordance with the instruction manual of the instrument, check the various functions of the instrument, so that it can be in a normal state. A.2.5 Test: in accordance with the ginning mode and the variety of cotton (fine-staple cotton or long-staple cotton), select a corresponding test gear. From each test sample, take out (50  5) g