ASTM D7722-22

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: D7722 − 22
Standard Terminology Relating to
1
Assembly of Textile Structures
This standard is issued under the fixed designation D7722; 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 critical sewn seam—as related to assembly of sewn textile
structures, those junctions of textile fabric sections where
1.1 This terminology identifies industrial terms related to
failure of the seam assembly results in the textile structure
stitches and seams that are used for the assembly of textile
being unable to meet the performance requirements for the
structures.
intended use. (See seam failure; sewn seam strength).
1.2 Section 3, Terminology, is categorized into two
DISCUSSION—Textile fabrics, which are manufactured at fixed widths
subsections, specific to the two areas of specialization under
androlledonholdershavingvariouslengths,needtobecutintovarious
this document. shapes for assembly and manufacture of end use textile items. The
types of end use items can vary from a small bag with drawstring to a
1.2.1 Section 3.1 Relating to Seams.
large geotextile stabilization project. As such, the fabrics used for the
1.2.2 Section 3.2 Relating to Stitches.
2 2 2
end use projects can have a mass from 2 oz/yd (67 g/m ) up 80 oz/yd
2
1.3 For other terms relating to textiles refer to Terminology
(2665 g/m ); and a tensile strength from 3 lbf (13N) up to 1200 lbf
D123. (5350 N).
It is anticipated that based on the fabric structure and end use
1.4 This international standard was developed in accor-
assembly, critical seams be able to achieve seam efficiency that is from
dance with internationally recognized principles on standard-
60%to80%ofthefabrictensilestrength.Whileafabrichavingtensile
ization established in the Decision on Principles for the
strength of 13N is anticipated to demonstrate seam efficiency of
Development of International Standards, Guides and Recom-
approximately 10 N, 80 % of the fabric tensile strength; it is anticipated
mendations issued by the World Trade Organization Technical that a fabric having a tensile strength of 5350 N will have a seam
efficiency of approximately 3200 N, 60 % of fabric tensile strength.
Barriers to Trade (TBT) Committee.
double-stitched seam-finish, n—a finish for the raw edges of
2. Referenced Documents
a plain seam, in which another row of machine stitching is
2
madethroughbothseamallowancesplacedtogether. D1683/
2.1 ASTM Standards:
D123 Terminology Relating to Textiles D1683M, D6193
D1683/D1683M Test Method for Failure in Sewn Seams of
grin, v—in sewn seams, to stress a seam so that the individual
Woven Fabrics
stitches can be seen.
D1908 Test Method for Needle-Related Damage Due to
3
Sewing in Woven Fabrics
needle damage, n—in sewn fabrics, the partial or complete
D5034 TestMethodforBreakingStrengthandElongationof
yarn severance or fiber fusing caused by a needle passing
Textile Fabrics (Grab Test)
through a fabric during sewing.
D6193 Practice for Stitches and Seams
DISCUSSION—This can also be referred to as needle cuts. D1908-89
seam, n—a line where two or more fabrics are joined, usually
3. Terminology
near the edge. (See also sewn seam, glued seam, stapled
3.1 Definitions Relating to Seams:
seam, thermally bonded seam.) D6193
seam allowance, n—in sewn fabrics, the distance from the
edge of a fabric to the parallel stitch line furthest from that
1
ThisterminologyisunderthejurisdictionofASTMCommitteeD13onTextiles
edge. D1683/D1683M, D6193
and is the direct responsibility of Subcommittee D13.54 on Subassemblies.
Current edition approved April 1, 2022. Published May 2022. Originally
seam assembly, n—the composite structure obtained when
approved in 2011. Last previous edition approved in 2017 as D7722-17. DOI:
10.1520/D7722-22. fabric(s) are joined by means of a seam. D1683/D1683M,
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
D6193
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
DISCUSSION—A seam assembly may be described in terms of fabric
Standards volume information, refer to the standard’s Document Summary page on
orientation, seam direction, seam type, stitch type, seam allowance,
the ASTM website.
3
sewing thread tex number(s) and type(s) stitch density, stitch gage, and
Withdrawn. The last approved version of this historical standard is referenced
on www.astm.org. rows of stitching. D1683/D1683M
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