GB/T 21331-2021_English: PDF (GB/T21331-2021)
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 21331-2021 | English | 170 |
Add to Cart
|
0--9 seconds. Auto-delivery
|
Fluff pulp
| Valid |
GB/T 21331-2021
|
| GB/T 21331-2008 | English | 85 |
Add to Cart
|
0--9 seconds. Auto-delivery
|
Fluff pulp
| Obsolete |
GB/T 21331-2008
|
| Standard ID | GB/T 21331-2021 (GB/T21331-2021) | | Description (Translated English) | Fluff pulp | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Y31 | | Classification of International Standard | 85.040 | | Word Count Estimation | 14,148 | | Date of Issue | 2021-03-09 | | Date of Implementation | 2022-04-01 | | Older Standard (superseded by this standard) | GB/T 21331-2008 | | Drafting Organization | China Light (Jinjiang) Hygiene Products Research Co., Ltd., National Paper Quality Supervision and Inspection Center, China Pulp and Paper Research Institute Co., Ltd., Internet International Paper Investment (Shanghai) Co., Ltd., Hangzhou Reliable Care Products Co., Ltd., Fujian Hengan Home Supplies Co., Ltd., Georgia Pacific Jiping (Shanghai) Trading Co., Ltd. | | Administrative Organization | National Paper Industry Standardization Technical Committee (SAC/TC 141) | | Regulation (derived from) | National Standard Announcement No. 3 of 2021 | | Proposing organization | China National Light Industry Council | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | | Standard ID | GB/T 21331-2008 (GB/T21331-2008) | | Description (Translated English) | Fluff pulp | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Y31 | | Classification of International Standard | 85.040 | | Word Count Estimation | 9,922 | | Date of Issue | 2008-01-04 | | Date of Implementation | 2008-09-01 | | Drafting Organization | Exit Inspection and Quarantine of the PRC Tianjin | | Administrative Organization | National Standardization Technical Committee Paper Industry | | Regulation (derived from) | National Standard Approval Announcement 2008 No.1 (Total No.114) | | Proposing organization | China Light Industry Federation | | Issuing agency(ies) | Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China | | Summary | This standard specifies the fluff pulp product categories, technical requirements, test methods, inspection rules and signs, packaging, transport and storage. This standard applies to the production of disposable hygiene materials fluff pulp. |
GB/T 21331-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 85.040
CCS Y 31
Replacing GB/T 21331-2008
Fluff pulp
绒毛浆
ISSUED ON: MARCH 09, 2021
IMPLEMENTED ON: APRIL 01, 2022
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 Product classification ... 6
5 Technical requirements ... 6
6 Test methods ... 7
7 Inspection rules ... 9
8 Marks, packaging, transportation and storage ... 10
Annex A (normative) Dispersion method for fluff pulp board ... 12
Annex B (normative) Determination of dry bulkiness, water absorption time and
water absorption amount of fluff pulp ... 14
Fluff pulp
1 Scope
This Standard specifies the terms and definitions, product classification,
technical requirements, test methods, inspection rules and marks, packaging,
transportation, storage for fluff pulp.
This Standard is applicable to raw fluff pulp for the production of disposable
sanitary products.
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 451.2, Paper and board - Determination of grammage
GB/T 451.3, Paper and board - Determination of thickness
GB/T 462, Paper, board and pulp - Determination of moisture content of
analytical sample
GB/T 740, Pulps - Sampling for testing
GB/T 1539, Paperboard; Determination of bursting strength
GB/T 2828.1, Sampling procedures for inspection by attributea - Part 1:
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 10739, Paper, board and pulps - STANDARD atmosphere for
conditioning and testing
GB/T 10740, Pulp - Estimation of dirt and shives
GB 15979, Hygienic Standard for Disposable Sanitary Products
GB/T 22804, Pulp, paper and board - Determination of mercury content
GB/T 22902, Pulps - Determination of acetone-soluble matter
GB/T 24991, Paper, board and pulps - Determination of lead content -
Graphite furnace atomic absorption spectrometry method
GB/T 24992, Paper, board and pulps - Determination of arsenic
GB/T 24997, Paper, board and pulps - Determination of cadmium content -
Atomic absorption spectrometric method
GB/T 27741-2018, Paper and board - Determination of migratable
fluorescent whitening agents
GB/T 34845, Tissue paper - Determination of absorbable organic halogen
(AOX)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 treated fluff pulp
the fluff pulp that has been chemically treated and has significantly reduced
burst resistance
3.2 untreated pulp
the fluff pulp that has not been chemically treated
4 Product classification
Fluff pulp is divided into treated fluff pulp and untreated pulp according to
whether it has been chemically treated.
5 Technical requirements
5.1 The indicators of physical and chemical properties of fluff pulp shall meet
the requirements of Table 1.
6.3 Quantitative deviation
Quantitative deviation is determined according to GB/T 451.2.
6.4 Tightness
Tightness is measured according to GB/T 451.3.
6.5 Burst resistance
Burst strength is measured according to GB/T 1539.
6.6 D65 brightness
D65 brightness is measured according to GB/T 7974.
6.7 Dry bulkiness
Dry bulkiness is measured in accordance with Annex B. The fluff pulp board is
dispersed according to Annex A.
6.8 Water absorption time
Water absorption time is measured in accordance with Annex B.
6.9 Water absorption amount
Water absorption amount is measured in accordance with Annex B.
6.10 Movable fluorescent substance
Movable fluorescent substance is qualitatively measured according to the
method given in Clause 5 of GB/T 27741-2018.
6.11 Acetone extract
Acetone extract is determined measured to GB/T 22902.
6.12 Absorbable organic halogen (AOX)
AOX is measured according to GB/T 34845.
6.13 Heavy metal
The content of heavy metal lead (Pb) is determined according to GB/T 24991.
The content of heavy metal arsenic (As) is determined according to GB/T 24992.
The content of heavy metal cadmium (Cd) is determined according to GB/T
24997. The content of heavy metal mercury (Hg) is determined according to
GB/T 22804.
7.4 When sampling, the external packaging of the sample shall be checked first.
Then take a specimen from it for inspection.
7.5 Acceptability determination: The number of samples inspected for the first
time shall be equal to the first sample size given in the plan. If the number of
nonconforming products found in the first sample is less than or equal to the
first acceptance number, the batch shall be considered acceptable. If the
number of nonconforming products found in the first sample is greater than or
equal to the first rejected number, the batch shall be considered unacceptable.
If the number of nonconforming products found in the first sample is between
the first acceptance number and the first rejection number, the second sample
of the sample size given by the plan shall be inspected and the number of
nonconforming products found in the first sample and the second sample shall
be accumulated. If the cumulative number of nonconforming products is less
than or equal to the second acceptance number, then the batch is determined
as acceptable. If the cumulative number of nonconforming products is greater
than or equal to the second rejected number, the batch is determined as
unacceptable.
7.6 If the buyer has objections to the quality of the product, the batch of products
shall be sealed up and notified to the supplier within three months after arrival
(or as stipulated in the contract). The supplier and the buyer shall jointly conduct
sampling inspection to this batch of products. If it does not meet the
requirements of this Standard, the batch will be rejected. It shall be dealt with
by the supplier. If it meets the requirements of this Standard, the batch shall be
accepted and dealt with by the buyer.
8 Marks, packaging, transportation and storage
8.1 Each batch of fluff pulp shall be marked with the product name,
implementation standard number, production date, batch number, manufacturer
name, manufacturer address, product specifications, product type and other
information, accompanying with a product certificate.
8.2 Each roll (piece) of the product shall be wrapped tightly with plastic film.
8.3 When the products are shipped, clean transportation tools with protective
measures shall be used. They shall not be co-transported with polluting
substances.
8.4 During the handling process, the products shall be handled with care, kept
from rain and moisture. They shall not be thrown away.
Annex A
(normative)
Dispersion method for fluff pulp board
A.1 Apparatus
A.1.1 Paper cutter;
A.1.2 Laboratory fluff pulp board disperser: The schematic diagram is shown in
Figure A.1. In the middle of the nail-shaped diffuser is a metal drum with a
diameter of 150mm and about 500 nails on the outside. It is driven by an electric
motor with a speed of 6000r/min~8000r/min. There is a protective casing
outside the drum. There are feeding rollers [speed can be constant within the
range of (4±1) cm/s] and a discharge port on the casing.
A.2 Sampling method
After removing the two-layer pulp board on the outer layer of the fluff pulp board,
conduct sampling. Use a paper cutter to cut into strips of fluff pulp board
samples with a width of about 30mm and a length of not less than 100mm.
A.3 Dispersion method
Start the disperser power supply. After the motor reaches the rated number of
revolutions, insert the strip-shaped fluff pulp board sample between the two
feeding rollers. The dispersed fluff pulp is collected from the discharge port with
negative pressure.
NOTE 1: To prevent the tail end of the strip fluff pulp board sample from entering the
disperser and rotating with the metal drum then it cannot be effectively dispersed, discard
the sample at the end of 1cm~2cm.
NOTE 2: To prevent the long-term work of the equipment from heating up and affecting the
performance of the sample, the equipment shall not continuously work for more than 15min.
NOTE 3: If the fluff pulp sample after dispersion is blocked in the disperser, discard this
part of the sample.
B.4.1.2 Weigh about 3.05g of fluff pulp sample that is completely dispersed and
balanced under standard atmospheric conditions. Use a tweezer to put them in
the fluff pulp inlet several times. Make them sucked into the plastic molding tube
for molding. The molded lump fluff pulp specimen remains in the test module.
Use the balance to weigh the total mass of the test module and specimen,
recorded as dry weight mdry.
NOTE: If the upper end of the formed specimen is not flat, it may use a needle or pointed
tweezers to carefully adjust it to roughly level. Then weigh the dry weight.
B.4.2 Determination of dry bulkiness and water absorption performance
B.4.2.1 Place the test module and the specimen on the dry bulkiness and water
absorption performance tester (B.1.2). Gently place a pressure block with a
mass of (500±5) g on the top of the specimen. After 30s, read the bulky height
h of the specimen through the height gauge on the inner surface of the plastic
molding tube.
B.4.2.2 Start the pumping system. Inject normal saline at (23.0±1.0)°C into the
dry bulkiness and water absorption performance tester. When the surface of
the normal saline contacts the 80-mesh metal filter, start the timer. After the
saline is completely soaked in the specimen, the built-in electrode of the
pressure block is turned on. The timer shall stop timing. The timer reading at
this time is the water absorption time of the specimen.
B.4.2.3 After the water absorption time is measured, the pumping system
continues to pump water for 30s. Then the pump shuts down. The water level
drops. After the liquid level of the saline drops below the 80-mesh metal filter,
the wet specimen starts to drain under the action of the briquette. After the wet
specimen is drained for 30s, remove the pressure block. Use the balance to
weigh the total mass of the test module and the wet specimen, recorded as wet
weight mwet.
NOTE: If after removing the briquette, the bottom of the briquette is stained with fluff pulp,
this test shall be invalid.
B.4.2.4 Take another set of dry test modules. Repeat B.4.2.2 and B.4.2.3 to
conduct blank test. Use the balance to weigh the wet empty weight of the test
module after the blank test is over, m’0.
B.4.2.5 Conduct at least 3 parallel tests. Calculate the average of dry bulkiness,
water absorption time and water absorption amount respectively.
B.5 Result calculation
B.5.1 The dry bulkiness X of fluff pulp is calculated according to formula (B.1)
and formula (B.2), to the nearest of 0.5cm3/g.
......
GB/T 21331-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 85.040
Y 31
Fluff pulp
绒毛浆
ISSUED ON. JANUARY 4,2008
IMPLEMENTED ON. SEPTEMBER 1,2008
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 .. 4
2 Normative references ... 4
3 Terms and Definitions ... 5
4 Product classification and grading ... 5
5 Technical requirements ... 5
6 Test Method ... 6
7 Inspection rules ... 7
8 Mark, packaging, transportation and storage .. 8
Appendix A (Normative) Dispersion method for fluff pulp board ... 9
Appendix B (Normative) Determination of the dry-fluffiness degree, water
absorption time and water absorption quantity of fluff pulp .. 10
Foreword
Appendix A and Appendix B of this Standard are normative.
This Standard was proposed by China National Light Industry Council.
This Standard shall be under the jurisdiction of National Standardization Technical
Committee of Paper-making Industry.
Main drafting organizations of this Standard. Tianjin Entry-Exit Inspection and
Quarantine Bureau; AND China National Pulp and Paper Research Institute.
Drafting organizations of this Standard. Yunnan Investment Forestry and Pulp Co.,
Ltd.; AND Guangxi Nanning Fenghuang Paper Co., Ltd.
Main drafters of this Part. Li Jianyong, Zhao Lihua and Chen Xi.
This standard is explained by the National Standardization Technical Committee of
the National Paper Industry.
This standard is issued for the first time.
Fluff pulp
1 Scope
This Standard specifies the product classification, technical requirements, test methods,
inspection rules and marks, packaging, transportation and storage of fluff pulp.
This Standard is applicable to the raw-material fluff pulp for the production of disposable
hygienic products.
2 Normative references
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For the dated references, the subsequent amendments
(excluding corrections) or revisions do not apply to this Standard, however, parties who
reach an agreement based on this Standard are encouraged to study if the latest
versions of these documents are applicable. For undated references, the latest edition
of the referenced document applies.
GB/T 451.2 Paper and board -- Determination of grammage (GB/T 451.2-2002, eqv
ISO 536.1995)
GB/T 451.3 Paper and board -- Determination of thickness (GB/T 451.3-2002, idt ISO
534.1988)
GB/T 462 Paper and board -- Determination of moisture (GB/T 462-2003, ISO
287.1985, MOD)
GB/T 740 Pulps -- Sampling for testing (GB/T 740-2003, ISO 7213.1991, IDT)
GB/T 1539 Paperboard -- Determination of bursting strength (GB/T 1539-2007, ISO
2759.1983, EQV)
GB/T 2828.1 Sampling procedures for inspection by attributes – Part 1. Sampling
schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection (GB/T
2828.1-2003, ISO 2859-1.1999, IDT)
GB/T 7974 Paper, board and pulp -- Measurement of brightness -- Diff/Geometry (GB/T
7974-2002, neq ISO 2470.1999)
GB/T 7979 Pulps -- Determination of dichloromethane soluble matter
GB/T 10739 Paper, board and pulps -- Standard atmosphere for conditioning and
testing (GB/T 10739-2002, eqv ISO 187.1990)
acceptance quantity, then shall be deemed that this batch is acceptable; If the quantity of
the unaccepted products which are found in the first sample is greater than or equal to the
first rejection quantity, then it shall be deemed that this batch is unacceptable. If the quantity
of the unaccepted products which are found in the first sample is between the first
acceptance quantity and the first rejection quantity, then the second sample which is given
by the scheme shall be tested, and the quantity of the unaccepted products which are
found in the first sample and the second samples shall be accumulated. If the cumulative
quantity of the unaccepted products is less than or equal to the second acceptance quantity,
then it shall be deemed that this batch is acceptable; If the cumulative quantity of the
unaccepted products is greater than or equal to the second acceptance quantity, then it
shall be deemed that this batch is unacceptable.
7.5 The hygienic indicators shall be determined according to GB 15979. If one indicator of
the hygienic indicators does not comply with the provisions, then this batch shall be judged
as unqualified.
7.6 If the Buyer has any objection to the product quality, then the products of this batch
shall be sealed AND the Supplier shall be notified within three months after the arrival (or
according to the contract). The products shall be sampled and inspected jointly by the
Supplier and Buyer. If it fails to comply with this Standard, then it shall be judged as the
unqualified products, it shall be handled by the Supplier; if it complies with this Standard,
then the batch shall be judged as the qualified product, it shall be handled by the Buyer.
8 Mark, packaging, transportation and storage
8.1 Each roll of fluff pulp shall be marked with the product name, product’s standard number,
trademark, manufacturing enterprise’s name, address, specification, batch number or roll
number, quantification, air-dry weight, grade, date of manufacture; and the product should
be attached with the product qualification certificate.
8.2 Each roll of the product shall be wrapped tightly with the plastic film.
8.3 When transporting the products, it should use the clean transportation facilities which
have the safeguard procedures. The products shall not be transported with the materials
with contamination nature.
8.4 During the process of handling, it shall pay attention to unload the products gently, and
to prevent the rain and damp. The products shall not be tossed or thrown.
8.5 The products shall be properly stored in the dry, clean, non-toxic, odor-free and
pollution-free warehouse.
absorption quantity of fluff pulp
Take 3g of the dispersed fluff pulp; mold it in the molding pipe which is placed with the fluff
pulp sample. The sample shall be retained in the molding pipe. Each sample should have
at least 5 pieces of specimen. Place the sample’s molding pipe on the fluff pulp’s fluffiness
degree & water absorption quantity analyzer which is not filled with water. Gently add 500g
of load on the fluff pulp. Remove the sample’s molding pipe. Record the height of the
specimen after 30s, i.e. the height of fluffiness of the fluff pulp. The unit is millimeters. Start
the water pump; inject 23 °C water into the fluff pulp’s fluffiness degree & water absorption
quantity analyzer. Start the timer. Record the water absorption time after the specimen is
saturated with water; take two significant digits. The water absorption of the sample shall
be at least 30s, and then reduce the water level. After the wet sample drains for 30s,
remove the load; weigh the wet sample.
At least three parallel tests shall be performed; check the results obtained from each
sample; ignore the maximum value; calculate the average value of the dry-fluffiness degree,
water absorption time and water absorption quantity respectively.
B.4 Calculation of the results
B.4.1 The dry-fluffiness degree of fluff pulp, X (cm3/g), shall be calculated as the formula
(B.1). The accuracy is 0.5cm3/g.
Where.
S -- The basal area of the specimen. The unit is square centimeter (cm2) (S of 50mm
basal diameter is 19.64 cm2);
h -- the height of the specimen after compression. The unit is millimeter (mm);
m1 -- The mass of the sample under the condition of standard atmosphere. The unit is
gram (g) (it is 3.0g here).
B.4.2 The dry-fluffiness degree of fluff pulp, X (cm3/g), shall be calculated as the formula
(B.1). The accuracy is 0.5cm3/g.
Where.
m2 -- the mass of the sample after water absorption. The unit is gram (g).
m1 -- the mass of the sample under the condition of standard atmosphere. The unit is
......
|