ASTM D1575-90(1995)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
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Designation: D 1575 – 90 (Reapproved 1995)
Standard Test Method for
Fiber Length of Wool in Scoured Wool and in Card Sliver
This standard is issued under the fixed designation D 1575; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.3 wool, n—the fibrous covering of the sheep, Ovis
species.
1.1 This test method covers the estimation of the average
3.1.4 For definitions of other textile terms used in this test
fiber length and length distribution of wool in nonparallel
method, refer to Terminology D 123.
assemblies, such as scoured wool, and in card sliver.
1.2 This test method is applicable to many fibers other than
4. Summary of Test Method
wool if in the form of a nonparallel assembly or in a card sliver.
4.1 The sample or test specimen is prepared for measure-
1.3 This test method is not applicable to unscoured wool or
ment by hand carding when necessary, manipulated on a comb
to wool top.
sorter, and separated into definite length increments. The
1.4 This test method specifically requires length in inches
weight of the fibers in each length increment is obtained, and
and mass in metric units, and is not contrary to ASTM policy.
from these data estimates of the weight-biased average fiber
The values stated in inch-pound units are to be regarded as the
length and weight-biased length distribution are calculated.
standard. The information in parentheses is for information
only.
5. Significance and Use
NOTE 1—The determination of staple length of grease wool is covered
5.1 This test method is not recommended for acceptance
in Method D 1234, Sampling and Testing Staple Length of Grease Wool,
testing due to its poor between-laboratory precision. In some
and the average length of fibers in wool top is covered in Test Method
cases the purchaser and the seller may have to test a commer-
D 519.
cial shipment of one or more specific materials by the best
1.5 This standard does not purport to address the safety
available method even though the method has not been
concerns, if any, associated with its use. It is the responsibility
recommended for acceptance testing of commercial shipments.
of the user of this standard to establish appropriate safety and
In such a case, if there is a disagreement arising from
health practices and determine the applicability of regulatory
differences in values reported by the purchaser and the seller
limitations prior to use.
when using this method for acceptance testing, the statistical
bias, if any, between the laboratory of the purchaser and the
2. Referenced Documents
laboratory of the seller should be determined with each
2.1 ASTM Standards:
comparison being based on testing specimens randomly drawn
D 123 Terminology Relating to Textiles
from one sample of material of the type being tested.
D 1234 Method for Sampling and Testing Staple Length of
5.2 A knowledge of the average length and length distribu-
Grease Wool
tion of fibers is important to fiber processors. This method is
D 519 Test Method for Length of Fiber in Wool Top
useful for inplant control testing and for research purposes.
D 1776 Practice for Conditioning Textiles for Testing
6. Apparatus
3. Terminology
6.1 Comb Sorter, similar to that described in Section 6, of
3.1 Definitions:
Test Method D 519, but provided with the modifications
3.1.1 carded wool, n—scoured wool which has been pro-
discussed in Note 2.
cessed through a carding machine.
NOTE 2—For specimens in which the longest fibers do not exceed 6 in.
3.1.2 scoured wool, n—wool from which the bulk of impu-
(150 mm), the test can be performed on one 15-in. (380-mm) sorter. For
rities has been removed by an aqueous or solvent washing
specimens in which the longest fibers exceed 6 in., two sorters, 8-in.
process.
(200-mm) or 15-in., shall be used. When two sorters are used, no
alteration is required. When one 15-in. sorter is used, the sorter shall be
altered. As shown in Fig. 1, an additional faller supporting rod shall be
inserted from the rear of the sorter to support faller bars 9 through 15.
This test method is under the jurisdiction of ASTM Committee D-13 on
Holding brackets for supporting two retaining bars at the rear of the sorter
Textiles, and is the direct responsibility of Subcommittee D13.13 on Wool and Wool
Felt.
Current edition approved Jan. 26, 1990. Published May 1990. Originally
published as D 1575 – 58 T. Last previous edition D 1575 – 83. Apparatus meeting these requirements is furnished by Alfred Suter Co., Prell
Annual Book of ASTM Standards, Vol 07.01. Plaza, Orangeburg, NY 10962.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
D 1575
FIG. 1 Faller Supporting Bar
are required. One holding bracket, a suggested design of which is shown
9. Preparation of Specimens
in Fig. 2, shall be mounted on each side of the sorter frame over the spaces
9.1 Prepare specimens of scoured wool for testing by hand
between faller bars 14 and 15.
carding into a short sliver. Spread the 2-g specimen over the
6.2 Balance, having a capacity of 100 mg and a sensitivity
teeth of one hand card. Use the other hand to parallel the fibers.
of 0.1 mg.
Normally, 10 to 15 strokes are sufficient. Exercise caution to
6.3 Hand Cards.
prevent fiber breakage. The fibers will be on each card, as
shown in Fig. 3, at the end of the carding operation. Remove
7. Sampling, Selection, and Number of Specimens
the fibers from each card in a sheet and place them together
7.1 Take, at random, samples consisting of at least 2-g
with the fringe in the same direction. Form a short sliver by
portions from separate locations in the lot in accordance with
rolling, being careful to keep the fibers parallel.
the schedule in the following table.
9.2 Specimens of carded sliver require no preparation.
Size of Lot, lb Number of Sampling Units
Up to 20 000 (9000 kg) 4
10. Procedure
Over 20 000 1 for each additional 5000 lb
(2250 kg) or fraction thereof
...