GB/T 8942-2016 PDF in English
GB/T 8942-2016 (GB/T8942-2016, GBT 8942-2016, GBT8942-2016)
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Name of Chinese Standard | Status |
| GB/T 8942-2016 | English | 90 |
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Paper -- Determination of softness
| Valid |
| GB/T 8942-2002 | English | 110 |
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Paper -- Determination of softness
| Obsolete |
| GB/T 8942-1988 | English | 199 |
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Paper--Determination of softness
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Standards related to (historical): GB/T 8942-2016
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GB/T 8942-2016: PDF in English (GBT 8942-2016) GB/T 8942-2016
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 85.010
Y 30
Replacing GB/T 8942-2002
Paper – Determination of Softness
ISSUED ON: DECEMBER 13, 2016
IMPLEMENTED ON: JULY 01, 2017
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Principle ... 4
4 Apparatus ... 4
5 Sample Preparation ... 6
6 Test Procedures ... 6
7 Calculation of Results ... 6
8 Test Report ... 7
Paper – Determination of Softness
1 Scope
This Standard specifies the method of using the hand-feeling softness tester to
determine the softness of paper.
This Standard is applicable to various wrinkle toilet paper, tissue paper and its
derivatives, as well as other papers that require softness.
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) are applicable to this document.
GB/T 450 Paper and Board--Sampling for Testing
GB/T 10739 Paper, Board and Pulps - Standard Atmosphere for Conditioning and
Testing
3 Principle
Under the specified conditions, when the plate-shaped probe presses the sample
into the slit to a certain depth (about 8mm), the instrument records the sum BETWEEN
bending resistance force of the sample itself AND the maximum vector of the friction
force of sample and the slit, which is called the softness of the sample; the smaller the
instrument indication value is, the softer the sample.
4 Apparatus
4.1 Instrument structure
The structural schematic diagram of the hand-feeling softness tester can refer to Figure
1.
The instrument indication value error shall be ±1.0%.
4.4 Instrument indication value repeatability
The instrument indication value repeatability shall be no greater than 1.0%.
4.5 Precautions
The instrument shall be installed on the flat and stable bench.
5 Sample Preparation
5.1 The sample shall be taken as per GB/T 450; it shall be subjected to the temperature
and humidity treatment as per GB/T 10739.
5.2 According to the actual number of layers of the product, cut the sample into the
size of 100mm×100mm. If the sample size is less than 100mm×100mm, try to cut he
maximum size; the size deviation shall not exceed ±0.5mm. Meanwhile, mark the
longitudinal, lateral, front and rear sides, respectively. If the front and rear sides can’t
be distinguished, ensure the same side of the sample upwards; so that guarantee the
sample can be tested separately on the two sides.
6 Test Procedures
6.1 Start and preheat the instrument; then calibrate the instrument as per the
instrument manual.
6.2 Place the sample on the middle of the test bench; and make it as symmetrical as
possible to the slit. For the multilayer sample, it shall be layered and then overlapped
in the original order for the softness test. Press the test button, begin to test. After the
probe completes the whole process, the instrument records the test value.
6.3 Test the remaining samples as per 6.2; separately test 10 effective data in the
longitudinal and lateral directions. The samples shall be tests 5 facing up and 5 facing
down in each direction.
NOTE: When testing the softness in longitudinal direction, the longitudinal direction of the
sample is perpendicular to the direction of the slit. When testing the softness in lateral direction,
the longitudinal direction of the sample is parallel to the direction of the slit.
7 Calculation of Results
The results shall be expressed by the arithmetic mean of the test results in the
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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