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GB/T 20810-2018 PDF in English


GB/T 20810-2018 (GB/T20810-2018, GBT 20810-2018, GBT20810-2018)
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GB/T 20810-2018: PDF in English (GBT 20810-2018)

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, packaging, transport and storage
8.1 Sales marks and packaging
8.1.1 The following content shall be marked on the sales package of the product:
a) Product name (including typeface of toilet tissue paper and toilet tissue
base paper);
b) Executive standard number;
c) Main raw materials: it shall be marked with "primary wood pulp (fiber) or
virgin non-wood (grass or bamboo or reed or bagasse) pulp (fiber) or virgin
mixed pulp (fiber) or recycled pulp (fiber)";
d) Production date and shelf life, or production batch number and limited use
date;
e) Product specifications: for roll toilet tissue paper and disc type toilet tissue
paper, it shall mark width, pitch, number of layers; for flat-cut toilet tissue
paper and tissue toilet tissue paper, it shall mark length, width and number
of layers; for toilet tissue base paper, it shall mark roll width;
f) Product quantity: or roll toilet tissue paper and disc type toilet tissue paper,
it shall mark roll weight or number of sections (segments); for flat-cut toilet
tissue paper, it shall mark packaging mass or number of sheets; for tissue
toilet tissue paper, it shall mark number of tissues; for toilet tissue base
paper, it shall mark roll weight;
g) Product quality level and product conformity mark;
h) Name, address, and contact information of producer or organization in
charge;
i) Toilet tissue paper shall be marked "for toilet use";
round table with grooves is fixed at the center of the upper surface of the disc.
6 triangular prisms are evenly inlaid on the upper surface of the disc. 8 blades
are evenly embedded on the circumference of the disc.
A.2 Specimen extraction
Take any roll (pack or disc) of toilet tissue paper. Cut out two specimens of
100mm×100mm (finished product layer). The specimen taken shall be
representative. If the width of the specimen is less than 100mm, take the
specimen with an area of 0.01m2.
A.3 Test steps
A.3.1 Adjust the instrument level. Check the instrument to ensure the normal
operation of the instrument.
A.3.2 Fill the plum tube with tap water to make the water volume in the cylinder
reach 5L. Turn on compressed air. Set pressure to 0.4MPa and air flow to
10L/min. Make bubbles evenly pass from the pores into the water in the cylinder.
Start the rotor. Set the rotor speed to 350r/min. After the vortex in the cylinder
is stable, the height from the water surface to the bottom of the vortex is about
one-third of the total height of the water surface in the cylinder. Set the test time
to 40s. Put the specimen into the center of the vortex in the cylinder. During
placement, make sure that the paper surface is perpendicular to the horizontal.
At the same time, start timing. Turn off the motor after 40s. And stop ventilation.
Observe whether the sample in the cylinder is dispersed. If one or more
fragments appear, it is determined that the dispersibility of the specimen is
conforming, otherwise it is determined as nonconforming.
NOTE: If the specimen sinks to the bottom of the cylinder during the test, the specimen is
broken by the bottom rotor, then this test shall be invalid. It needs to retest. If the two tests
are invalid, it can appropriately increase the gas flow or reduce the rotor speed, to prevent
the specimen from sinking to the bottom of the cylinder. In this case, it needs to be indicated
in the report.
A.3.3 After the test, start drain button. The motor runs at high speed to
completely break the specimen. After 10s, the motor automatically stops
rotating and opens the drain valve. Discharge all water and specimen debris in
the cylinder. Fill with proper water again to clean the cylinder wall and rotor.
Drain the water. Prepare the next test.
NOTE: If the debris cannot be completely discharged after cleaning once, consider multiple
cleanings.
A.3.4 Test two specimens for each sample.
A.4 Expression of results
B.2.1 Sampling and testing shall be carried out under the standard atmospheric
conditions specified in GB/T 10739.
NOTE: During the powder drop rate test, the specimen does not need to be treated for
constant temperature and humidity.
B.2.2 Take any roll (disc or pack) of toilet tissue paper. Remove the outer
packaging. Conduct sampling according to the following method:
a) Roll toilet tissue paper: Weigh the mass of toilet tissue paper after
removing the outer packaging as m1. Fold the toilet tissue paper into a
specimen with a length of about 200mm. Keep the long sides flush when
folded. In order to facilitate the test, the larger mass roll toilet tissue paper
can be divided into multiple specimens;
b) Flat-cut toilet tissue paper or tissue toilet tissue paper: Unfold and stack
each piece of toilet tissue paper. Keep the long side flush when stacked.
Take about 150g of specimen. Weigh its mass as m1. For flat-cut toilet
tissue paper or tissue toilet tissue paper less than 150g, take the whole
package as a specimen to test;
c) Disc toilet tissue paper: Fold the toilet tissue paper into a specimen with a
length of about 200mm. Keep the long sides flush when folded. Take about
150g of specimen. Weigh its mass as m1.
B.2.3 Fix one end of the long side of the specimen to the specimen holder.
When fixing, the surface of the specimen shall be perpendicular to the swing
direction. Ensure that the specimen shall not touch the inner wall of the box
during the measurement.
B.2.4 Wear gloves during the test. The specimen shall be handled with care to
avoid affecting the test results.
B.2.5 Start the instrument and start timing. Let the sample swing in the box for
2min.
B.2.6 After the test, turn off the instrument. Remove the specimen. Weigh the
mass of the specimen (if it is roll toilet tissue paper with a core, weigh it together
with the core), as m2. The larger mass of roll toilet tissue paper is calculated as
m2 (including the mass of the core) by the sum of the mass of the specimen
after multiple measurements.
B.2.7 After unpacking the specimen, it shall immediately test. Complete the test
within 1h.
B.3 Expression of results
Annex C
(normative)
Determination of microbial indicators
C.1 Preparation of medium and reagents
C.1.1 Nutrient agar medium
Preparation: Weigh 33g of nutrient agar to dissolve in 1Lof distilled water. Heat
and boil until it is completely dissolved. Dispense. After autoclaving at 121°C
for 15min, it is ready for use.
C.1.2 Lactose bile salt fermentation tube
Preparation: Weigh 35g of lactose bile salt fermentation medium to dissolve in
1Lof distilled water. After it is completely dissolved, dispense each tube with
50mL. And put in an inverted tube. After autoclaving at 115°C for 15min, it shall
be obtained.
NOTE: When making double-material lactose bile salt fermentation tube, except distilled
water, other ingredients are doubled.
C.1.3 Eosin methylene blue agar medium
Preparation: Weigh 36g of eosin methylene blue agar medium to dissolve in
1Lof distilled water. Soak for 15min. Heat and boil until it is completely dissolved.
After autoclaving at 115°C for 15min, cool to 50°C~60°C. Shake the culture
medium and pour into sterile plates for later use.
C.1.4 Lactose fermentation tube
Preparation: Weigh 25.3g of lactose fermentation medium to dissolve in 1Lof
distilled water. Soak for 5min. Heat and boil until it is completely dissolved.
Dispense into test tubes with inverted tubes. After autoclaving at 115°C for
15min, it shall be obtained.
C.1.5 Blood agar medium
Preparation: Heat and melt the sterilized nutrient agar. When it cools to about
50°C, under aseptic operation, according to the ratio of nutrient agar:
defibrillated blood is 10:1, add defibrinated blood. Shake well. Pour into a sterile
dish. Place in a refrigerator for later use.
C.1.6 Rabbit plasma
Completely mix and shake well. After centrifugal precipitation, aspirate the
supernatant to obtain.
NOTE: The above mediums are all finished products. The amount used can be determined
according to the product specification.
C.2 Product collection and sample processing
C.2.1 In three large packages of the same batch number, at least 12 samples
of the smallest sales packaging are randomly selected. A quarter of the sample
is used for testing. A quarter of the sample is used for sample reservation. The
other half of the sample (can be sealed on-site) for re-inspection if necessary.
The minimum sales package of the sample must not be damaged. Before
testing, it must not be opened.
C.2.2 On a super clean bench, use aseptic method to open at least 3 minimum
sales packages. Weigh 10g±1g of sample from it. Cut into pieces and add to
200mL of sterile saline. Completely mix well to obtain a saline solution.
C.3 Detection of the total number of bacterial colonies
C.3.1 Operation steps
After the above sample liquid settles naturally, take the supernatant for colony
count. Inoculate a total of 5 plates. Add 1mL of sample solution to each plate.
Then use 15mL~20mL of nutrient agar that has been melted down to 45°C.
Pour into the plate. Completely mix well. After the agar solidifies, flip the plate.
Incubate at 35°C±2°C for 48h. Then count the number of bacteria on the plate
(when the number of colonies on the plate exceeds 200, it shall be diluted
before counting).
C.3.2 Result report
Plates with flaky colonies shall not be used. Count the colonies on the plates
that meet the requirements. Calculate the result according to formula (C.1):
Where,
X - Total number of bacterial colonies, in colonies forming unit per gram (CFU/g);
A - Total number of bacterial colonies on 5 nutrient agar plates, in colonies
forming unit per gram (CFU/g);
K - Dilution factor.
is golden yellow, large and protruding, round, with smooth surface, with
hemolytic circle around. Pick typical colonies and smear them for Gram stain
microscopy. If they are seen, arrange in a grape shape, without spores and
capsules. It shall carry out the following tests:
a) Mannitol fermentation tube test. Inoculate the above colonies into mannitol
medium. Incubate at 35°C±2°C for 24h. Ferment mannitol. The one who
produces acid is positive.
b) Plasma coagulase test. SLIDE METHOD: Take clean and dry slides. →
Respectively add 1 drop of saline and 1 drop of rabbit plasma to both ends.
→ Pick the colonies and mix with the two for 5min. It shall be negative if
both have no coagulation. If there are clumps or granular coagulation in
the plasma, but the physiological saline is still uniformly turbid without
coagulation, it shall be positive. If both of them have coagulation
phenomenon, then perform the tube coagulase test. TEST TUBE
METHOD: Draw 0.5mL of 1:4 fresh plasma. Place in sterile cuvette. →
Add the same amount of bacteria to be tested for 24h, and 0.5mL of broth
culture. Mix well. → Put in 35°C±2°C incubator or water bath. →
Observe every 0.5h. → When a clot appears within 24h, it shall be
positive. At the same time, respectively use 0.5mL of the broth culture of
known plasma coagulase positive and negative strains as a positive and
negative control.
C.5.2 Result report
Where there are suspicious colonies growing on the agar plate, the microscopic
examination is gram-positive staphylococcus, it can ferment mannitol to
produce acid, the plasma coagulase is positive, it may report that
staphylococcus aureus is detected in the sample.
C.6 Detection of streptococcus hemolyticus
C.6.1 Operation steps
Take 5mL of sample solution. Add to 50mL of glucose meat infusion broth.
Incubate at 35°C±2°C for 24h. Streak the culture into blood agar plates.
Incubate at 35°C±2°C for 24h. Observe the characteristics of the colony.
Streptococcus hemolyticus is off-white on the blood plate, translucent or
opaque, with needle-like protrusions, smooth surface, neat edges, and a
colorless transparent hemolytic circle around it. Take typical colonies for smear
Gram stain microscopy. It shall be gram-positive, cocci arranged in a chain. If
the microscopic examination meets the above conditions, the streptokinase and
bacitracin sensitivity test shall be performed.
a) Streptokinase test. Draw 0.2mL of potassium oxalate plasma. → Add
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.