ASTM D1234-85(2008)
(Test Method)Standard Test Method of Sampling and Testing Staple Length of Grease Wool
Standard Test Method of Sampling and Testing Staple Length of Grease Wool
SIGNIFICANCE AND USE
The testing procedure in this test method for the determination of staple length is considered satisfactory for acceptance testing of commercial shipments of grease wool since the test method has been used in the trade for acceptance testing.
In case of a dispute arising from differences in reported test results when using this test method for acceptance testing of commercial shipments, the purchaser and the supplier should conduct comparative tests to determine if there is a statistical bias between their laboratories. Competent statistical assistance is recommended for the investigation of bias. As a minimum, the two parties should take a group of test specimens that are as homogeneous as possible and that are from a lot of material of the type in question. The test specimens should then be randomly assigned in equal numbers to each laboratory for testing. The average results from the two laboratories should be compared using Student's t-test for unpaired data and an acceptable probability level chosen by the two parties before the testing is begun. If a bias is found, either its cause must be found and corrected, or the purchaser and the supplier must agree to interpret future test results in the light of the known bias.
The test method is used for the determination of the average unstretched staple length and the staple length distribution of a lot of wool in order to assign length classes when determining the conformance of lots and shipments to length specifications.
In this test method, the size of a lot covered by the test procedure is limited to not more than 200 packages per test. Any shipment exceeding the above limits is divided into lots within the prescribed limits.
The nature of the sampling procedure is such that grease wool staples as originally drawn from the wool of the lot require only a slight amount of preparation before measurement. The bulk and laboratory samples are synonymous in this test method.
Compression of wool in the bale ma...
SCOPE
1.1 This test method covers procedures for sampling and measuring the unstretched staple length, and variability in length, of grease or pulled wool staples. The test method is also applicable to mohair and other animal fibers in staple form. The procedure is not recommended for individual fibers or groups of straightened fibers.
Note 1—The determination of fiber length in wool top is covered in Test Method D 519, the determination of fiber length of wool is covered in Test Method D 1575.
1.2 The values stated in inch-pound units are to be regarded as the standard. The values stated in SI units are provided for information purposes only.
1.3 This standard does not purport to address the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D1234 − 85(Reapproved 2008)
Standard Test Method of
Sampling and Testing Staple Length of Grease Wool
This standard is issued under the fixed designation D1234; 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 3.1.1 grease wool, n—wool taken from the living sheep and
which has not been commercially scoured.
1.1 This test method covers procedures for sampling and
measuring the unstretched staple length, and variability in
3.1.2 staple, n—in grease wool,atuftorlockoffiberswhich
length,ofgreaseorpulledwoolstaples.Thetestmethodisalso
naturally cling together, as found in a fleece.
applicabletomohairandotheranimalfibersinstapleform.The
3.1.3 staple length, n—in grease wool, the length of a staple
procedure is not recommended for individual fibers or groups
obtained by measuring the natural staple without stretching or
of straightened fibers.
disturbing the crimp of the fibers.
NOTE 1—The determination of fiber length in wool top is covered in
3.1.4 For definitions of other terms used in this test method,
Test Method D519, the determination of fiber length of wool is covered in
Test Method D1575.
refer to Terminology D123.
1.2 The values stated in inch-pound units are to be regarded
4. Summary of Test Method
as the standard. The values stated in SI units are provided for
information purposes only.
4.1 By hand or by means of a sampling tool, staples
1.3 This standard does not purport to address the safety
(subsampling units) are withdrawn from randomly selected
concerns, if any, associated with its use. It is the responsibility
sampling units (bags, bales, or packages) from a lot of wool or
of the user of this standard to establish appropriate safety and
other animal fibers. The unstretched lengths of the staples are
health practices and determine the applicability of regulatory
measured and the average staple length, standard deviation,
limitations prior to use.
and coefficient of variation calculated.
2. Referenced Documents
5. Significance and Use
2.1 ASTM Standards:
5.1 The testing procedure in this test method for the
D123 Terminology Relating to Textiles
determination of staple length is considered satisfactory for
D519 Test Method for Length of Fiber in Wool Top
acceptance testing of commercial shipments of grease wool
D1575 Test Method for Fiber Length of Wool in Scoured
since the test method has been used in the trade for acceptance
Wool and in Card Sliver
testing.
D4271 Practice for Writing Statements on Sampling in Test
Methods for Textiles (Withdrawn 2009)
5.1.1 In case of a dispute arising from differences in
reported test results when using this test method for acceptance
3. Terminology
testing of commercial shipments, the purchaser and the sup-
3.1 Definitions:
plier should conduct comparative tests to determine if there is
a statistical bias between their laboratories. Competent statis-
1 tical assistance is recommended for the investigation of bias.
This test method is under the jurisdiction ofASTM Committee D13 on Textiles
and is the direct responsibility of Subcommittee D13.13 on Wool and Felt. As a minimum, the two parties should take a group of test
Current edition approved Aug. 1, 2008. Published October 2008. Originally
specimens that are as homogeneous as possible and that are
approved in 1950. Last previous edition approved in 2001 as D1234 – 85 (2001).
from a lot of material of the type in question. The test
DOI: 10.1520/D1234-85R08.
Further information covering the procedures and techniques described in this specimens should then be randomly assigned in equal numbers
test method appears in D. D. Johnston, H. Dean Ray, W. J. Manning, and E. M.
to each laboratory for testing.The average results from the two
Pohle, “Relationships of Staple Length in Grease Wool and Resultant Top,” Textile
laboratories should be compared using Student’s t-test for
Research Journal, Vol 21, October 1951, pp. 757–762.
unpaireddataandanacceptableprobabilitylevelchosenbythe
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
two parties before the testing is begun. If a bias is found, either
Standards volume information, refer to the standard’s Document Summary page on
its cause must be found and corrected, or the purchaser and the
the ASTM website.
4 supplier must agree to interpret future test results in the light of
The last approved version of this historical standard is referenced on
www.astm.org. the known bias.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D1234 − 85 (2008)
5.2 The test method is used for the determination of the 5.3 In this test method, the size of a lot covered by the test
average unstretched staple length and the staple length distri- procedure is limited to not more than 200 packages per test.
bution of a lot of wool in order to assign length classes when
Any shipment exceeding the above limits is divided into lots
determining the conformance of lots and shipments to length
within the prescribed limits.
specifications.
1 3 1 3 1 3 1 5
in. ⁄8 ⁄16 ⁄4 ⁄8 ⁄2 3 ⁄8 4 4 ⁄2 4 ⁄8 24
mm 3.0 5.0 6.0 10.0 13.0 86.0 102.0 114.0 118.0 610.0
FIG. 1 Wool Staple Sampling Tool
5.4 The nature of the sampling procedure is such that grease 7. Sampling
wool staples as originally drawn from the wool of the lot
7.1 Lot Sample—Asalotsampleforacceptancetesting,take
require only a slight amount of preparation before measure-
at random the number of packages of wool from a lot as
ment. The bulk and laboratory samples are synonymous in this
directed in Table 1. Consider packages of wool as the primary
test method.
sampling units.
5.5 Compression of wool in the bale makes it difficult to
7.2 Laboratory Samples—Consider the packages of wool in
penetrate the interior of the bale with the sampling tool.
the lot sample as the laboratory sample.
However, staples can be drawn from the surface of the bale
7.3 Test Specimens—From each package in the laboratory
with the sampling tool or by hand.
sample,taketenstaples,withfivestaplesbeingtakenatequally
5.6 Practice D4271 contains information on how to write a
spaced intervals from each of two opposite sides of the
section on sampling in test methods.
package. Each staple should be about 0.25 in. (5 mm) in
diameter. If larger, reduce the staple to the correct size by
NOTE 2—An extensive discussion of grease wool staple sampling can
be found in the literature. gently withdrawing the excess fibers from one side of the
staple. Take the staples as follows:
6. Apparatus
7.3.1 Sampling by Tool:
7.3.1.1 Depth of Draw—Gage the depth for inserting the
6.1 Sampling Tool—Aspear-shapedtoolwithahookorbarb
sampling tool so that different levels of the package are
at one end for use in extracting a small quantity of wool fr
...
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