GB/T 20810-2018 English PDF (GBT20810-2018)

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GB/T 20810-2018: Toilet tissue paper (including toilet tissue base paper)
GB/T 20810-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 85.060
Y 32
Replacing GB/T 20810-2006
Toilet tissue paper (including toilet tissue base paper)
ISSUED ON: JUNE 07, 2018
IMPLEMENTED ON: JULY 01, 2019
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 Terms and definitions ... 6 
4 Classification ... 7 
5 Requirements ... 7 
6 Test methods ... 11 
7 Inspection rules ... 14 
8 Marks, packaging, transport and storage ... 16 
Annex A (normative) Determination of dispersibility ... 18 
Annex B (normative) Determination of powder drop rate ... 21 
Annex C (normative) Determination of microbial indicators ... 24 
Toilet tissue paper (including toilet tissue base paper)
1 Scope
This Standard specifies terms and definitions, classification, requirements, test
methods, inspection rules, marks, packaging, transport and storage for toilet
tissue paper (including toilet tissue base paper).
This Standard is applicable to toilet tissue paper used in daily life and toilet
tissue base paper used for processing toilet tissue paper sold externally.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 450, Paper and board - Sampling for testing
GB/T 451.1, Paper and board - Determination of size and deviation
GB/T 461.1, Paper and board - Determination of capillary rise (Klemm
method)
GB/T 462, Paper and board - Determination of moisture content
GB/T 742, Fibrous raw material, pulp, paper and board - Determination of
ash
GB/T 1541, Paper and board - Determination of dirt
GB/T 2828.1, Sampling procedures for inspection by attributea-Part1:
Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot
inspection
GB/T 7974, Paper, board and pulps - Measurement of diffuse blue
reflectance factor - D65 brightness (Diff/Geometry, Outdoor daylight
conditions)
GB/T 8942, Paper - Determination of softness
GB/T 10739, Paper, board and pulps - STANDARD atmosphere for
Softness is measured according to GB/T 8942. Slit width is 5mm. Specimen
size is 100mm×100mm. If the specimen size does not reach 100mm, it shall be
converted to 100mm and report the result. Toilet tissue paper shall be measured
according to the finished layer. Whether it is an embossed or un-embossed
specimen, it shall be uncovered and then overlapped for measurement. When
sampling and testing, avoid embossed or folded parts. And the bump pattern is
tested with 3 sheets facing up. Report the test results with the vertical and
horizontal average.
NOTE 1: If the specimen size does not reach 100mm, the softness conversion method is
as follows:
a) Longitudinal softness = measured longitudinal softness × 100mm / transverse size
of specimen;
b) Transverse softness = measured transverse softness × 100mm / longitudinal size of
specimen.
NOTE 2: When measuring longitudinal softness, the longitudinal direction of the specimen
is perpendicular to the direction of the slit. When measuring the lateral flexibility, the
longitudinal direction of the specimen is parallel to the direction of the slit.
NOTE 3: If the specimen cannot be completely peeled off the delamination, then directly
test without delamination, and it must be noted in the report.
6.7 Migrating fluorescent substance
Place the specimen under the UV lamp. Under UV light with wavelengths of
254nm and 365nm, check if there is fluorescence. If the specimen has no
fluorescence under the UV lamp, it is judged that there is no migrating
fluorescent substance. If the specimen has fluorescence phenomenon, perform
the measurement of migrating fluorescent substance according to Clause 5 of
GB/T 27741-2011.
6.8 Ash content
Ash content is determined according to GB/T 742. Burning temperature is
575°C.
6.9 Spherical burst resistance
Spherical burst resistance is determined according to GB/T 24328.7. It is
determined by the number of finished layers.
6.10 Dispersibility
Dispersibility is determined according to Annex A.
tissue paper) with a sensitivity of 0.1g or a scale with a sensitivity of 1kg (toilet
tissue base paper) to respectively weigh specimen mass. Subtract the nominal
value from the mass of each specimen. Express results in maximum shortage.
Round the result to integer. The number of sections is determined according to
G.4 in Annex G of JJF 1070-2005. Test 3 complete packages for each sample.
Express results in maximum shortage. Round the result to integer.
6.18.2 Size deviation
6.18.2.1 Measurement of size deviation for flat-cut toilet tissue paper and tissue
toilet tissue paper: Take 10 specimens from any package. Use steel ruler with
1mm graduation to measure the length and width of each specimen. And
calculate the average separately. The average value minus the nominal value
to indicate the size deviation. Round the result to integer.
6.18.2.2 Measurement of width deviation for roll toilet tissue paper, disc type
toilet tissue paper and toilet tissue base paper: Take 3 complete specimens for
each sample. Use steel ruler or steel tape with 1mm graduation to measure the
width of each specimen. Express the width deviation by subtracting the nominal
value from the average width value of 3 specimens. Round the result to integer.
6.18.2.3 Measurement of pitch deviation for roll toilet tissue paper and disc type
toilet tissue paper: Take 1 roll (tray) of toilet tissue paper. After removing the first
15 sections, take 10 consecutive sections. Use steel ruler with 1mm graduation
to respectively measure the length of each of the 10 sections. Calculate the
average. Use the average value to minus the nominal value to express the
specimen pitch deviation. Round the result to integer.
6.19 Appearance quality
Visually inspect the appearance quality. For the detection of toilet tissue paper
defects, breakages, hard blocks, raw grass tendons, pulp masses and other
paper defects and foreign matter as well as other appearance paper defects, it
shall choose any whole roll (disc, package). Open completely. Visually inspect
it.
7 Inspection rules
7.1 The manufacturer shall ensure that the toilet tissue paper and toilet tissue
base paper produced comply with this Standard or contract. The products of
the same raw material and the same specification, with one delivery quantity,
are one batch. Each batch of products shall be accompanied by a product
qualification certificate.
7.2 If the microbiological indicators or raw materials of a batch of toilet tissue
unacceptable.
7.5 If the purchaser has objections to the quality of the product, it can notify the
supplier for a joint re-inspection within three months after the arrival of the
goods or entrust a mutually agreed inspection department to conduct the re-
inspection. If the re-inspection result does not meet the requirements of this
Standard, the batch will be determined as unacceptable and the supplier is
responsible for processing. If it meets the requirements of this Standard, the
batch is determined as acceptable and the purchaser is responsible for
processing.
8 Marks, pac...