Study Guides (292,002)
US (144,448)
UA (879)
CTD (31)
Midterm

CTD 215 Study Guide - Midterm Guide: Plying, Linear Density, Ring Spinning

7 pages40 viewsFall 2015

Department
Clothing, Textiles and Interior Design
Course Code
CTD 215
Professor
Dr.Thompson
Study Guide
Midterm

This preview shows pages 1-2. to view the full 7 pages of the document.
Textiles Exam 3 Notes
What is spinning?
Spinning: the process of producing a yarn from staple fibers
o Spun yarn: a continuous strand of staple fibers held together by some
mechanism.
What are the different types of yarn?
Staple: short fibers
o Any natural or manufactured fiber produced in or cut to a short length
measured in inches or centimeters.
Single: one strand
o Consists of one strand of fibers held together by some mechanism.
Simple: same appearance along length
o A yarn alike in all its parts.
Filament: continuous filament
o A yarn made from filament fibers; smooth or bulky are possible.
Plied (Ply): two or more strands, twisted.
o Consists of two or more strands of fibers held together by twist or
some other mechanism
Cord (Cabled): consists of two or more ply yarns held together by
twist or some other means.
Complex: variable appearance along length
What does the term ply refer to?
Ply yarn: consists of two or more strands of fibers held together by twist.
o Can go a step further to cord: two or more ply yarns twisted together.
Does adding plies add strength?
Yes as well as yarn diameter, uniformity and quality.
Filament Fibers vs. Staple Fibers
Filament fiber: refers to fibers that are extremely long (length measured in
miles or kilometers) or yarns made of these fibers.
Filament yarn: a yarn made from filament fibers; smooth or bulky are
possible. Made in a spinneret.
Type of yarns: Smooth-filament (mono or multi-filament), tape, and
network.
o Smooth-filament yarn: a yarn of filament fibers that have not been
crimped or textured.
Regular or conventional filament yarns.
Uniform as they come from the spinneret. The fibers are parallel.
There are no protruding ends, so no linting or pilling. They give
little bulk, loft, or cover to fabric. Fabrics made from them shed
soil.
find more resources at oneclass.com
find more resources at oneclass.com
You're Reading a Preview

Unlock to view full version

Only half of the first page are available for preview. Some parts have been intentionally blurred.

o Tape yarn: inexpensive yarns produced from extruded polymer film
by extrusion or the split-fiber method.
Products: technical
o Network yarn: made of fibers that are connected at points along their
length.
Less bulky and dense and more comfortable compared to tape
yarns.
Products: technical
Staple fiber: any natural or manufactured fiber produced in or cut to a short
length measured in inches or centimeters.
Staple yarn: short fibers
Types of yarns: Spun yarns
o Spun yarns: continuous strands of staple fibers usually held together
by twist. They have a fuzzy surface and protruding fiber ends, greater
amounts of twist compared to filament yarns, short fibers that pull
apart, and partially parallel fibers.
Turns per inch: (tpi) a measure of yarn twist.
How does tpi affect properties of yarn?
o As twist increases, yarn strength and yarn stiffness increase up to a
point, level off, then begin to fall at very high twist levels.
o Lower twist yarns: harrier, pills more, more comfortable skin contact,
and less expensive
o Low twist: a very small amount of twist used in filament yarns that
keeps fibers together in processing and fabrication.
o Napping twist: a small amount of twist used to produce lofty spun
yarns for fabrics that will be napped (brushing fibers to surface).
For flannelette, flannel, blankets, etc.
o Average twist: the most commonly used amount of twist, in the range
of 20 to 30 tpi for yams.
o Hard/Voile twist: a high amount of yarn twist in the range of 30 to
40 tpi, which produces a harsher fabric hand.
Used for voile
o Crepe twist: refers to a yarn with extremely high twist and great
liveliness.
S and Z twist
o S-twist: if, when held in a vertical position, the spirals conform to the
direction of slope of the central portion of the letter S.
o Z-twist: the direction of spirals conforms to the slope of the central
portion of the letter Z.
Z-twist is more common for weaving yarns.
Direct vs. Indirect systems of yarn size
Direct systems: used for filament yarns. Terms of weight per unit length.
The higher the number, the coarser the yarn.
find more resources at oneclass.com
find more resources at oneclass.com
You're Reading a Preview

Unlock to view full version


Loved by over 2.2 million students

Over 90% improved by at least one letter grade.