GB/T 43014-2023 English PDF (GBT43014-2023)

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GB/T 43014-2023: Polyimide short cut fibre
GB/T 43014-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.060.20
CCS W 52
Polyimide short cut fibre
聚酰亚胺超短纤维
ISSUED ON: SEPTEMBER 07, 2023
IMPLEMENTED ON: APRIL 01, 2024
Issued by: State Administration for Market Regulation;
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 ... 4
4 Product identification ... 5
5 Technical requirements ... 5
6 Test methods ... 6
7 Inspection rules ... 8
8 Marking, packaging, transportation and storage ... 9
Appendix A (Normative) Polyimide fiber linear density and equivalent diameter
conversion ... 11
Appendix B (Normative) Test method for diameter deviation rate of polyimide short
cut fibre ... 12
Appendix C (Normative) Test methods for length deviation, percentage of overlength
staple fibres and percentage of over short fibres of polyimide short cut fibre ... 14
Polyimide short cut fibre
1 Scope
This document specifies the product identification, technical requirements, inspection
rules, marking, packaging, transportation and storage of polyimide short cut fibre, and
describes the test methods.
This document applies to polyimide short cut fibres with a nominal linear density of
0.89 dtex ~ 3.33 dtex, an equivalent diameter of 8.87 μm ~ 17.16 μm, and a cutting
length less than 20 mm.
2 Normative references
The following documents are referred to in the text in such a way that some or all of
their content constitutes requirements of this document. For dated references, only the
version corresponding to that date is applicable to this document; for undated references,
the latest version (including all amendments) is applicable to this document.
GB/T 4146 (all parts), Textiles - Man-made fibres
GB/T 6503, Man-made fibres - Test method of moisture regain
GB/T 14334-2006, Sampling method for man-made staple fibres
GB/T 14335, Testing method for linear density of man-made staple fibres
GB/T 14337, Man-made fibre - Test method for tensile properties of staple fibre
GB/T 14339-2008, Testing method for defect of man-made staple fibres
GB/T 37631, Man-made fiber - Test method for thermal decomposition temperature
FZ/T 50016, Testing method for flame retardant property of viscose staple fibers -
Oxygen index
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 4146 (all
parts), as well as the following, apply.
3.1
temperature at 5% thermogravimetry weight loss
Temperature at which the mass of the sample loses 5% when thermogravimetric
analysis is performed under the same conditions under programmed temperature
control and a certain atmosphere.
3.2
equivalent diameter
Diameter of the circular cross-section fiber corresponding to the same linear density
fiber.
3.3
overlength fibre
Staple fiber whose length is greater than 130% of the nominal length and less than 2
times of the nominal length.
3.4
over short fibre
Fiber whose fiber length is less than 70% of the nominal length.
4 Product identification
4.1 Product specifications
The specifications of polyimide short cut fibres are expressed in terms of fiber linear
density (equivalent diameter) and cutting length. Among them, the unit of linear density
is decitex (dtex), the unit of equivalent diameter is micron (μm), and the unit of cutting
length is millimeter (mm). The equivalent diameter corresponding to the linear density
is calculated according to Appendix A.
Example: 1.67 dtex (12.15 μm) × 6 mm.
4.2 Product identification
Product identification shall include information such as product specifications, name or
batch number.
5 Technical requirements
5.1 Product grading
Products are divided into two grades: high-quality products and qualified products.
Follow the provisions of GB/T 6503.
7 Inspection rules
7.1 Inspection classification
Product inspection is divided into type inspection, ex-factory inspection and acceptance
inspection.
Type inspection shall be carried out when one of the following situations occurs:
a) during normal production, type inspection shall be carried out on a regular basis;
b) after formal production, if there are major changes in raw materials and processes
that may affect the quality of the product;
c) when the factory inspection result is significantly different from the previous type
inspection;
d) other times when type inspection is required.
7.2 Type inspection and ex-factory inspection
7.2.1 Inspection items
7.2.1.1 Type inspection items are 5.2 and 5.3. Among them, Table 2 shows optional
items, which are determined by negotiation between the supply and demand parties
according to the content of the trade agreement; 5.3 is not an item for grade assessment.
7.2.1.2 The ex-factory inspection items are the items specified in 5.2, Table 1 and 5.3,
among which 5.3 is not a grade assessment item.
7.2.2 Batching rules
Periodic sampling is used within a certain range to form an inspection batch. A
production batch can be composed of one inspection batch or several inspection batches.
7.2.3 Sampling regulations
7.2.3.1 Item 1 “Linear density deviation rate” and Item 3 “Breaking strength” in Table
1 as well as Item 1 “Oxygen index” in Table 2 are tested by taking fiber samples before
cutting.
7.2.3.2 Item 2, Items 4 ~ 8 in Table 1 and Item 2 “Temperature at 5% thermogravimetry
weight loss” in Table 2 shall be tested in accordance with the provisions of 6.1 and 6.3
in GB/T 14334-2006.
7.2.4 Determination rules
7.2.4.1 Compare the measured or calculated values of each performance item with the
limit values of the performance item indicators in Table 1 and Table 2, and rate one by
one. Use the lowest grade in the performance items to determine the grade of this batch
of products.
7.2.4.2 The test data of each performance item is based on one time and shall not be
tested again. If an abnormality occurs in the operation or instrument, after measures are
taken, the tester shall take a portion from the original sample and retest it once, and the
retest data shall prevail.
7.3 Acceptance inspection
7.3.1 General
The buyer shall promptly check whether the outer packaging, quantity and quality of
each batch of product packages are consistent with the manifest. Within three months
after a batch of products arrives at the buyer, re-inspection can be submitted if there is
any objection to the product quality. Re-inspection can be carried out by any party
agreed by both parties. If necessary, an arbitration inspection agency can be requested
to conduct sampling, inspection and arbitration in accordance with the requirements of
this document.
7.3.2 Inspection items
Same as 7.2.1.1.
7.3.3 Batching rules
Batch according to the original production batch.
7.3.4 Sampling regulations
Upon negotiation and agreement between the supply and demand parties, samples for
the linear density deviation rate, breaking strength, and oxygen index items can be
obtained from the samples retained by the manufacturer (the retained samples need to
be retained for six months). The sampling of other test items shall be in accordance with
6.2 and 6.3 in GB/T 14334-2006. Packages that have been accidentally dampened,
contaminated, scratched or have been opened during transportation shall not be taken.
7.3.5 Determination rul...