ASTM D5866-12(2020)
(Test Method)Standard Test Method for Neps in Cotton Fibers
Standard Test Method for Neps in Cotton Fibers
SIGNIFICANCE AND USE
5.1 Entangled cotton fibers that form neps have two sources: those that occur naturally as the cotton fiber develops on the plant into lint that is ready to be harvested and those that occur from mechanical action in harvesting, ginning, cleaning, carding or from a combination of mechanical action.
5.2 This test method does not identify whether the neps counted and measured are a result of seed variety, environmental influences, type of harvesting, or a result of mechanical processing. However, this information can be obtained from studies where samples are taken from plants in the field before harvesting and ginning, before and after cleaning, and carding before spinning.
5.3 The measurement of nep size and quantity going into, and coming out of, a fiber processing stage are commonly used to make adjustments in the processing machinery to reduce or eliminate the generation of mechanical neps. Neps that remain in spun yarns have a direct influence on neps in fabrics. For almost all types of yarn or fabric, neps are considered defects.
5.4 This test method provides a consistent and repeatable measurement of fiber nep count and size. Check cotton samples supplied by the manufacturer are used to verify consistent measurement levels and laboratory-to-laboratory precision.
5.5 This test method is considered satisfactory for acceptance testing when the levels of the laboratories are controlled by the use of the same reference standard cotton samples because the current estimates of between-laboratory precision are acceptable under these conditions. If there are differences of practical significance between reported test results for two laboratories or more, comparative tests should be performed to determine if there is a statistical bias between them using competent statistical assistance. At a minimum, ensure the test samples to be used are as homogeneous as possible, are drawn from the material from which the disparate test results were obtained, and are ran...
SCOPE
1.1 This test method covers the measurement of the quantity and size of neps in cotton using various instruments.
1.2 This test method is intended for testing ginned cotton and cotton taken from various fiber processing stages.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D5866 − 12 (Reapproved 2020)
Standard Test Method for
Neps in Cotton Fibers
This standard is issued under the fixed designation D5866; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3.2 For all other terminology related to textiles, refer to
Terminology D123.
1.1 This test method covers the measurement of the quantity
and size of neps in cotton using various instruments.
4. Summary of Test Method
1.2 This test method is intended for testing ginned cotton
4.1 A pre-weighed mass of cotton fibers is prepared per
and cotton taken from various fiber processing stages.
instrument manufacturer specifications. The instrument then
1.3 The values stated in SI units are to be regarded as
quantifies the neps and measures the size (diameter) of each
standard. No other units of measurement are included in this
nep.
standard.
4.2 Test data shows the mean or average nep size and the
1.4 This standard does not purport to address all of the
total number of neps per unit mass.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
5. Significance and Use
priate safety, health, and environmental practices and deter-
5.1 Entangledcottonfibersthatformnepshavetwosources:
mine the applicability of regulatory limitations prior to use.
those that occur naturally as the cotton fiber develops on the
1.5 This international standard was developed in accor-
plant into lint that is ready to be harvested and those that occur
dance with internationally recognized principles on standard-
from mechanical action in harvesting, ginning, cleaning, card-
ization established in the Decision on Principles for the
ing or from a combination of mechanical action.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical 5.2 This test method does not identify whether the neps
counted and measured are a result of seed variety, environmen-
Barriers to Trade (TBT) Committee.
tal influences, type of harvesting, or a result of mechanical
2. Referenced Documents processing. However, this information can be obtained from
studies where samples are taken from plants in the field before
2.1 ASTM Standards:
harvesting and ginning, before and after cleaning, and carding
D123 Terminology Relating to Textiles
before spinning.
D1441 Practice for Sampling Cotton Fibers for Testing
E691 Practice for Conducting an Interlaboratory Study to 5.3 The measurement of nep size and quantity going into,
Determine the Precision of a Test Method
and coming out of, a fiber processing stage are commonly used
D7139 Terminology for Cotton Fibers to make adjustments in the processing machinery to reduce or
eliminate the generation of mechanical neps. Neps that remain
3. Terminology
in spun yarns have a direct influence on neps in fabrics. For
almost all types of yarn or fabric, neps are considered defects.
3.1 For all terminology related to D13.11, refer to Termi-
nology D7139.
5.4 This test method provides a consistent and repeatable
3.1.1 The following terms are relevant to this standard: measurementoffibernepcountandsize.Checkcottonsamples
ginned lint, nep, sliver.
supplied by the manufacturer are used to verify consistent
measurement levels and laboratory-to-laboratory precision.
5.5 This test method is considered satisfactory for accep-
This test method is under the jurisdiction ofASTM Committee D13 on Textiles
tance testing when the levels of the laboratories are controlled
and is the direct responsibility of Subcommittee D13.11 on Cotton Fibers.
by the use of the same reference standard cotton samples
Current edition approved July 1, 2020. Published July 2020. Originally approved
because the current estimates of between-laboratory precision
in 1995. Last previous edition approved in 2012 as D5866 – 12. DOI: 10.1520/
D5866-12R20.
are acceptable under these conditions. If there are differences
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
of practical significance between reported test results for two
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
laboratories or more, comparative tests should be performed to
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. determine if there is a statistical bias between them using
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D5866 − 12 (2020)
competent statistical assistance.At a minimum, ensure the test 8.4 From two check cotton samples, test ten specimens
samples to be used are as homogeneous as possible, are drawn prepared according to 10.1 and 10.2 at least once a week.
from the material from which the disparate test results were Record the test data and compare them to the values supplied
obtained, and are randomly assigned in equal numbers to each by the manufacturer.
laboratoryfortesting.Thetestfromthetwolaboratoriesshould 8.4.1 The average of the ten tests on each of the check
be compared using a statistical test for unpaired data, at a cotton samples should be within 615 % of the designated
probability level chosen prior to the testing series. If a bias is values; otherwise, consultation with the manufacturer’s repre-
found, either its cause must be found and corrected, or future sentative is necessary.
test results for that material must be adjusted in consideration
9. Conditioning
of the known bias.
9.1 Neither laboratory samples nor test specimens need to
6. Apparatus and Material
be conditioned before testing. Moisture and temperature levels
have no effect on the nep measurement.
6.1 An instrument with a fiber individualizer for opening,
cleaning, and individualizing the fibers, and with an appropri-
10. Specimens
ate sensor for counting and sizing neps.
10.1 Test Specimens—Take the manufacturer’s suggested
6.2 Check Cottons
number of specimens at random from each laboratory sample
for single specimen feed instruments and for models with an
7. Sampling
automatic specimen feeding accessory. The weight and length
7.1 Lot Sample—For acceptance testing, take lot samples in
of each s
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