10. Yarn processing

Question 1

What is yarn?

Answer 1

Yarn is a continuous strand of textile fibers, filaments, or materials in a form suitable for knitting, weaving or otherwise intertwining to form a textile fabric

Question 2

Why interest in yarn processing?

Answer 2

Yarn type and quality affect product cost, quality and performance, But understanding yarn production will provide additional knowledge about products made from yarns.

Question 3

What is Filament yarns?

Answer 3

Filament yarns (filamentgarn) is almost always made from manufactured fibers by extruding a polymer solution thru a spinneret and solidifying it in fiber form. The grouping of the filaments with the addition of twist creates the filament yarn.

Question 4

Throwing?

Answer 4

Process for twisting silk filaments, evolved into twisting of manufactured fibers ant then into texturing. Throwing provides the specific yearn needed for a particular product.

Question 5

Filament yarns or staple fibers expensive?

Answer 5

Filament yarns are more expensive per pound than staple fibers, however, the cost of making tow into staple and then mechanically spinning it into yarn usually equalizes the final cost.

Question 6

What determines the number of filaments in the yarn?

Answer 6

The number of holes in the spinneret determines the number of filaments in the yarn.

Question 7

Name of uniform of yarns from the spinneret?

Answer 7

Regular, Conventional- or smooth-filament yarns.

Question 8

How can the luster of yarns from spinneret varies?

Answer 8

The yarn luster varies due to the amount of delusterant in the fiber and the amount of twist in the yarn. More luster with less or no twist. With thermoplastic fibers, twist can be heat-set. Filament yarns generally have either high twist or low twist.

Question 9

Smooth-filament yarns?

Answer 9

Smooth-filament yarns are uniform as they come from the spinneret. Fibers are parallel. No protruding ends, so they do not lint or pill. Gives little bulk, loft or cover to fabric. Fabrics made from them shed soil.

Question 10

What use of compact yarn?

Answer 10

Compact yarns are used in wind and water-resistant fabrics. Compactness is disadvantage in end uses in which bulk and absorbency are necessary for comfort.

Question 11

Nonround filaments?

Answer 11

Nonround filaments create more open space for air and moisture permeability and produce greater cover.

Question 12

Strength of filament yarns depends on..

Answer 12

strength of individual fibers and the number of filaments in the yarn. Strength of filament fibers is usually greater that staple fibers.

Question 13

Fine filaments..

Answer 13

fine filaments make very sheer, strong fabrics possible. In order to break yarn, filaments must be broken first.

Question 14

Monofilament yarns?

Answer 14

Primarily for technical uses. Monofilament yarns consist of single coarse-filament fiber. Use in fishing line, vegetable bags and other woven fabrics which low cost and high durability are most important.

Question 15

What is tape yarns?

Answer 15

Tape yarns are inexpensive yarns produced from extruded polymer films. Extrusion is the standard method of spinning fibers and some films. tape yarns are often used in technical products

Question 16

What is network yarns?

Answer 16

made of fibers connected in a network arrangement and are less bulky and dense compared to tape yarns. network yarns are often used in technical products