GB/T 21331-2021Fluff pulp (English PDF)

Foreword

This Standard was drafted in accordance with the rules given in GB/T 1.1-2020 "Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents".

This Standard replaces GB/T 21331-2008 "Fluff pulp". Compared with GB/T 21331-2008, in addition to structural adjustments and editorial changes, the main technical changes in this Standard are as follows.

a) deleted GB/T 7979 as a reference; added GB/T 22804, GB/T 22902, GB/T 24991, GB/T 24992, GB/T 24997, GB/T 27741-2018, GB/T 34845 as references;

b) deleted product levels;

c) modified D65 brightness, tightness, burst resistance, dry bulkiness, water absorption time, water absorption, and dustiness requirements (see 5.1 of this Edition, 5.1 of Edition 2008);

d) added footnotes to Table 1 to make a supplementary description of the requirements of the fluff pulp D65 brightness and burst resistance indicator;

e) modified the dichloromethane extract indicator to acetone extract; accordingly revised the requirements and test methods (see 5.1 and 6.11 of this Edition, 5.1 and 6.6 of Edition 2008);

f) added the requirements for the content of mobile fluorescent substances, absorbable organic halogens (AOX), lead (Pb), arsenic (As), cadmium (Cd), and mercury (Hg) and corresponding measurement methods (see 5.1 and Clause 6 of this Edition);

g) modified "sanitation indicator" to "microbiological indicator" (see 5.2 and 6.16 of this Edition, 5.2 and 6.11 of Edition 2008);

h) modified the acceptance quality limit (AQL) in the inspection rules accordingly based on the revised indicators in Clause 5;

i) added the note for dispersion method of fluff pulp board (see A.3 of this Edition);

j) modified test methods for dry bulkiness, water absorption time and water absorption amount (see Annex B of this Edition, Annex B of Edition 2008).

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)

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

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.

5.2 The microbial indicator of fluff pulp follows the regulations of GB 15979.

5.3 The fluff pulp board shall not have metal impurities, sand and other foreign objects that are visible to the naked eye. There are no obvious fiber bundles.

6 Test methods

7 Inspection rules

7.1 The manufacturer shall ensure that the fluff pulp produced meets the requirements of this Standard or the order contract.

7.2 If the microbiological indicators or raw materials are nonconforming, the batch is determined to be nonconforming.

7.3 Sampling for product delivery inspection shall be carried out in accordance with the provisions of GB/T 2828.1. The sample unit is roll or piece.

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.

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).

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.

8.4 During the handling process, the products shall be handled with care, kept from rain and moisture. They shall not be thrown away.

8.5 The products shall be properly stored in a dry, clean, non-toxic, odor-free, and non-polluting warehouse.