GB/T 21331-2021 English PDF (GBT21331-2021)

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GB/T 21331-2021: Fluff pulp
GB/T 21331-2021
Fluff pulp
ICS 85.040
CCSY31
National Standards of People's Republic of China
Replace GB/T 21331-2008
Fluff pulp
Released on 2021-03-09
2022-04-01 implementation
State Administration of Market Supervision and Administration
Issued by the National Standardization Management Committee
Preface
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents"
Drafting.
This document replaces GB/T 21331-2008 "Fluff Pulp", compared with GB/T 21331-2008, except for structural adjustments and editorial changes
In addition, the main technical changes are as follows.
a) Delete the reference to GB/T 7979, and add the reference to GB/T 22804, GB/T 22902, GB/T 24991, GB/T 24992,
GB/T 24997, GB/T 27741-2018, GB/T 34845;
b) Deleted the product level;
c) Modified the requirements of D65 brightness, tightness, burst resistance, dry bulkiness, water absorption time, water absorption, and dustiness (see 5.1,.2008 edition)
5.1);
d) A footnote has been added to Table 1 to supplement the requirements for the brightness and burst resistance of fluff pulp D65;
e) The index of dichloromethane extract was revised to acetone extract, and the requirements and test methods were revised accordingly (see 5.1 and 6.11,
5.1 and 6.6 of the.2008 version);
f) Increased content of mobile fluorescent substances, adsorbable organic halogens (AOX), lead (Pb), arsenic (As), cadmium (Cd), and mercury (Hg)
Requirements and corresponding measurement methods (see 5.1 and Chapter 6);
g) Amend "Sanitation Indicators" to "Microbiological Indicators" (see 5.2 and 6.16, 5.2 and 6.11 of the.2008 edition);
h) The acceptance quality limit (AQL) in the inspection rules is modified accordingly according to the revised indicators in Chapter 5;
i) The injection in the fluff pulp board dispersion method has been added (see A.3);
j) Modified the dry bulkiness, water absorption time and water absorption test methods (see Appendix B, Appendix B of the.2008 edition).
Please note that some of the contents of this document may involve patents. The issuing agency of this document is not responsible for identifying patents.
This document was proposed by the China National Light Industry Council.
This document is under the jurisdiction of the National Paper Industry Standardization Technical Committee (SAC/TC141).
This document was drafted by. China Light (Jinjiang) Hygienic 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 Heng'an Home
Garden Living Products Co., Ltd., Georgia Pacific Jiping (Shanghai) Trading Co., Ltd.
The main drafters of this document. Shen Zhenhuang, Luo Ge, Zhang Ruochen, Li Jianyong, Tang Shengde, Zhang Yue, Yang Yang, Kong Songhua, Wu Xiaobiao.
The previous versions of this document and the documents replaced are as follows.
---First published as GB/T 21331-2008 in.2008;
---This is the first revision.
Fluff pulp
1 Scope
This document specifies the terms and definitions of fluff pulp, product classification, technical requirements, test methods, inspection rules and signs, packaging, transportation,
Store.
This document is applicable to the raw fluff pulp for the production of disposable sanitary products.
2 Normative references
The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations
Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to
This document.
GB/T 451.2 Determination of the basis weight of paper and cardboard
GB/T 451.3 Determination of thickness of paper and cardboard
GB/T 462 Paper, paperboard and pulp analysis sample moisture determination
GB/T 740 Pulp sample collection
GB/T 1539 Determination of Burst Resistance of Paperboard
GB/T 2828.1 Sampling inspection procedure by attributes Part 1.Batch inspection sampling plan retrieved by acceptance quality limit (AQL)
GB/T 7974 Determination of blue light diffuse reflectance factor D65 brightness of paper, paperboard and pulp (diffuse/vertical method, outdoor daylight conditions)
GB/T 10739 Standard atmospheric conditions for handling and testing of paper, paperboard and pulp samples
GB/T 10740 Determination of pulp dust and fiber bundles
GB 15979 Hygienic standard for disposable sanitary products
GB/T 22804 Determination of Mercury Content in Pulp, Paper and Paperboard
GB/T 22902 Determination of acetone soluble matter of pulp
GB/T 24991 Paper, Paperboard and Pulp Determination of Lead Content Graphite Furnace Atomic Absorption Method
GB/T 24992 Determination of Arsenic Content in Paper, Paperboard and Pulp
GB/T 24997 Determination of cadmium content in paper, paperboard and pulp by atomic absorption spectrometry
GB/T 27741-2018 Determination of migratory fluorescent whitening agent for paper and paperboard
GB/T 34845 Determination of Absorbable Organohalogens (AOX) on Tissue Paper
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Fluff pulp whose burst resistance is significantly reduced after chemical treatment.
3.2
Untreated pulp
Fluff pulp that has not been chemically treated.
6.2 Sample treatment and test conditions
When determining the quantitative deviation, tightness, burst resistance, dry bulkiness, water absorption time, and water absorption, the sample should be within the standard specified in GB/T 10739.
The equilibrium is reached under atmospheric conditions, and the test is carried out under this condition.
6.3 Quantitative deviation
Quantitative deviation is determined according to GB/T 451.2.
6.4 Tightness
The tightness is measured according to GB/T 451.3.
6.5 Burst resistance
Bursting strength is determined according to GB/T 1539.
6.6 D65 brightness
The brightness of D65 is measured according to GB/T 7974.
6.7 Dry bulkiness
The dry bulkiness is determined according to Appendix B. Among them, the dispersion of fluff pulp pulp board is carried out in accordance with Appendix A.
6.8 Water absorption time
The water absorption time is determined in accordance with Appendix B.
6.9 Water absorption
The water absorption is measured in accordance with Appendix B.
6.10 Movable fluorescent substance
The mobile fluorescent substance shall be qualitatively determined according to the method given in Chapter 5 of GB/T 27741-2018.
6.11 Acetone extract
The acetone extract is measured according to GB/T 22902.
6.12 Adsorbable organic halogen (AOX)
AOX is measured according to GB/T 34845.
6.13 Heavy metals
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, and the heavy metal cadmium
The content of (Cd) is determined in accordance with GB/T 24997, and the content of heavy metal mercury (Hg) is determined in accordance with GB/T 22804.
6.14 Dust level
The dust level is determined according to GB/T 10740, and the determination result of either method of the laboratory paper measurement method and the pulp board measurement method is qualified.
The result is qualified.
6.15 Delivery moisture
Delivery moisture is measured according to GB/T 462.
6.16 Microbiological indicators
The microbiological index is determined according to GB 15979.
6.17 Appearance quality
The appearance quality is measured visually.
7 Inspection rules
7.1 The manufacturer shall ensure that the fluff pulp produced meets the requirements of this standard or the order contract, and that the same raw material, the same type, and one delivery are used.
The quantity is one batch, and each batch of products should be accompanied by a product qualification certificate.
7.2 If the microbiological indicators or raw materials are unqualified, the batch is judged as unqualified.
7.3 Sampling for product delivery inspection should be carried out in accordance with the provisions of GB/T 2828.1, and the sample unit is a roll or piece. Acceptance Quality Limit (AQL). Dry Peng
Porosity, water absorption time, water absorption, mobile fluorescent substances, adsorbable organic halogens (AOX), heavy metals (lead, arsenic, cadmium, mercury) are 4.0;
Quantity deviation, tightness, acetone extract, dustiness, burst resistance, delivery moisture, D65 brightness, appearance quality is 6.5.Sampling plan adopts normal inspection
Inspect the secondary sampling plan, the inspection level is the special inspection level S-2, see Table 2.
Table 2
7.4 When sampling, the external packaging of the sample should be checked first, and then the sample should be taken from it for inspection.
7.5 Determination of acceptability. The number of samples inspected for the first time should be equal to the first sample size given in the plan. If found in the first sample
If the number of nonconforming products is less than or equal to the first acceptance number, the batch should be considered acceptable; if the number of nonconforming products found in the first sample is large
If it is less than or equal to the first rejected number, the batch should be considered unacceptable. If the number of nonconforming products found in the first sample is between the first acceptance number
Between the number of rejections and the first rejection number, the second sample of the sample size given by the plan should be checked and the non-identities found in the first sample and the second sample should be accumulated.
The number of qualified products. If the cumulative number of non-conforming products is less than or equal to the second acceptance number, the batch is determined to be acceptable; if the cumulative number of non-conforming products is
If the number is greater than or equal to the second rejected number, the batch is determined to be unacceptable.
7.6 If the buyer has any objection to the quality of the product, the batch of products shall be sealed up and notified to the supplier within three months after the arrival (or according to the contract).
Both the supplier and the buyer jointly conduct sampling inspections on the batch of products. If it does not meet the requirements of this standard, it will be judged as unqualified and the supplier is responsible for handling; if it does
If it meets the requirements of this standard, it is judged as a batch qualified, and the buyer is responsible for processing.
8 Marking, 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, production company name, production company address, and product
Specifications, product types and other information, and affixed with product certification.
8.2 Each roll (piece) of the product should be wrapped tightly with plastic film.
8.3 When the product is transported, clean transportation tools with protective measures should be used, and no contaminant materials should be transported together.
8.4 During the handling process, the product should be handled with care, rain and moisture, and should not be thrown away.
8.5 The product should be properly stored in a dry, clean, non-toxic, odor-free, and non-polluting warehouse.
Appendix A
(Normative)
Dispersion method of fluff pulp board
A.1 Apparatus
A.1.1 Paper cutter;
A.1.2 Laboratory fluff pulp pulp board disperser. The schematic diagram is shown in Figure A.1.The middle of the nail-shaped disperser is a 150mm diameter and outer diameter.
The table is set with a metal drum with about 500 nails, which is driven by an electric motor with a rotation speed of 6000r/min~8000r/min. The outside of the drum is guaranteed
The casing is protected, and there is a feeding roller [speed can be constant in the range of (4±1) cm/s] and a discharge port on the casing.
A.2 Sampling method
After removing the two layers of pulp board on the outer layer of fluff pulp board, take a sample and cut it into a strip with a width of about 30mm and a length of not less than 100mm with a paper cutter.
Sample of fluff pulp pulp board.
A.3 Dispersion method
Start the power of the disperser, and after the motor reaches the rated number of revolutions, insert the strip-shaped fluff pulp board sample between the two feeding rollers, and the dispersed fluff
The wool pulp is collected from the discharge port with negative pressure.
Note 1.In order to prevent the tail end of the strip fluff pulp board sample from entering the disperser and rotating with the metal drum to be effectively dispersed, the 1cm~2cm part of the tail is discarded
sample.
Note 2.In order to prevent the long-term work of the equipment from heating up and affecting the sample performance, the equipment should not work continuously 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.1.3 Electronic balance
Sensitivity is 0.01g.
B.2 Principle
B.2.1 Sample forming
After the vacuum system is started, the dispersed fluff pulp sample is sucked from the inlet, and it is dispersed and descended in a spiral trajectory in the cone-shaped dispersion tube, and finally
Collected in a plastic molding tube to form a block sample for measuring dry bulkiness, water absorption time and water absorption.
B.2.2 Determination of dry bulkiness, water absorption time and water absorption
Place the test module (a metal frame with an 80-mesh metal filter on the plastic molding tube) together with the prepared fluff pulp sample on the dry fluffy
On the tester for measuring the degree and water absorption performance, after pressing the block for 30 seconds, measure the bulky height of the sample and calculate the dry bulkiness. Start the pumping system and try
The sample absorbs normal saline. When the normal saline is soaked in the sample, a timer records the water absorption time. After the sample has completely absorbed water and drained under pressure, weigh it <...