GB/T 40167-2021 English PDF (GBT40167-2021)

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GB/T 40167-2021: Paper and board - Accelerated ageing (100 ℃)
GB/T 40167-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 85.010
Y 30
Paper and board - Accelerated ageing (100 °C)
(ISO 5630-5:2008, Paper and board - Accelerated ageing - Part 5:
Exposure to elevated temperature at 100 °C, MOD)
ISSUED ON: MAY 21, 2021
IMPLEMENTED ON: DECEMBER 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Principle ... 5 
4 Instruments and equipment... 6 
5 Calibration and airtight glass tube preparation ... 6 
6 Sampling ... 7 
7 Sample processing ... 7 
8 Sample preparation ... 8 
9 Test procedure ... 8 
10 Result calculation ... 9 
11 Test report ... 10 
Paper and board - Accelerated ageing (100 °C)
1 Scope
This Standard specifies the accelerated ageing method of printing paper and
writing paper at 100 °C, and, by evaluating the impact of ageing treatment on
the two physical properties of the paper, namely folding number and tearing
resistance, predicts the effect of long-term natural ageing process on paper
stability.
This Standard applies to all kinds of printing paper and writing paper, including
coated paper and filled paper.
2 Normative references
The following documents are indispensable for the application of this document.
For dated references, only the dated version applies to this document. For
undated references, the latest edition (including all amendments) applies to this
document.
GB/T 450, Paper and board - Sampling for testing and identification of
machine and cross direction, wire side and felt side (GB/T 450-2008, ISO
186:2002, MOD)
GB/T 455, Paper and board - Determination of tearing resistance (GB/T 455-
2002, eqv ISO 1974:1990)
GB/T 457, Paper and board - Determination of folding endurance (GB/T 457-
2008, ISO 5626:1993, MOD)
GB/T 462, Paper, board and pulp - Determination of moisture content of
analytical sample (GB/T 462-2008, ISO 287:1985, ISO 638:1978, MOD)
GB/T 10739, Paper, board and pulps - Standard atmosphere for conditioning
and testing (GB/T 10739-2002, eqv ISO 187:1990)
3 Principle
Put the temperature and humidity treated sample into an airtight glass tube;
after ageing treatment at 100 °C for a certain period of time, compare the
changes in the folding number and tearing resistance of the sample before and
after the ageing treatment, so as to measure the stability of the paper strength.
b) Use tap water to thoroughly rinse the airtight glass tube to remove residual
non-ionic detergent;
c) Use distilled water to rinse three times and drain the airtight glass tube;
d) Dry the airtight glass tube in an oven at 105 °C;
e) Place the airtight glass tube (including threaded cap and "O" ring or gasket)
under the atmospheric conditions, that are specified in GB/T 10739, for
temperature and humidity conditioning for 24 h
5.2.2 Unused airtight glass tube for aging treatment
The unused airtight glass tube (including threaded cap and "O" ring or gasket)
shall be treated in an oven at 105 °C for at least 24 h before use. Before putting
the sample, it shall be placed under the atmospheric conditions that are
specified in GB/T 10739 for temperature and humidity conditioning for 24 h.
5.2.3 Storage of the airtight glass tube for aging treatment
After temperature and humidity treatment, seal the airtight glass tube and store
it.
6 Sampling
Wear clean cotton gloves when sampling.
If the purpose of the test is to evaluate a batch of samples, samples shall be
selected according to GB/T 450. If samples of other types are tested, it shall be
ensured that the sample taken is representative among the samples.
When the sample size is larger than the size of an A4 paper, the sample needs
to be cut into the size of an A4 paper.
Randomly select a number of samples from the samples; the number of
samples shall meet the requirements of the test. If the size of the sample is
smaller than the size of an A4 paper, calculate the number of samples to be cut
according to the area.
7 Sample processing
Under the standard atmospheric conditions that are specified in GB/T 10739,
perform temperature and humidity processing for the aging and control samples.
The control sample shall always be placed under the standard atmospheric
conditions that are specified in GB/T 10739.
8 Sample preparation
Cut two sets of samples, one set for aging treatment and one set for control
test. The size of the sample shall meet the requirements of GB/T 455 or GB/T
457. At the same time, determine the absolutely dry matter content of the
sample according to the provisions of GB/T 462; calculate the absolutely dry
matter.
9 Test procedure
9.1 Ageing of samples
Calculate the number of airtight glass tubes (4.2) that are required to load the
sample; ensure that there are (0.027 8 ± 0.000 07) g of absolutely dry sample
per cubic centimeter in the airtight glass tube. If the calculated number of airtight
glass tubes is not an integer, it shall be rounded up to the next integer.
Put the samples to be aged into the airtight glass tube; ensure that the sample
masses in each airtight glass tube are the same. The samples that are used for
the tearing resistance test shall be stacked together and then rolled and put into
the airtight glass tube; the samples that are used for the folding endurance test
shall be put into the rolled samples for the tearing resistance test.
If the mass of the absolutely dry samples per unit volume of the airtight glass
tube is less than the specified value, more samples need to be cut into the
airtight glass tube.
Put on the lid of the airtight glass tube and tighten it; ensure that the tube is
completely airtight. Mark the outer surface of the airtight glass tube, so as to
distinguish the sample in the tube.
Put the airtight glass tube that contains the sample into the blast drying oven
for laboratory (4.1); perform ageing treatment of the sample for (120.0 ± 0.5) h.
9.2 Equilibrium of the sample after aging
After taking the airtight glass tube out of the blast drying oven for laboratory, let
the airtight glass tube cool to room temperature naturally and keep it for at least
1 h. Record any changes in the surface of the sample during this process. Do
not open the threaded cap of the airtight glass tube during this process.
If the color of the sample surface becomes lighter during the cooling process, it
means that the airtight glass tube is not completely sealed. These samples shall
be discarded.