Chapter 8 Dyeing Flashcards
dyes
Treatment of textile material in water solution. Textile treated in aqueous solutions and dyestuffs
Pigments
insoluble colored particles made to adhere to a fabric.
Conventional, or Aqueous, Dyeing
(1)Dye molecules adhere to fiber
(2) Penetrate fiber
(3) Migrate in the fiber
(4) Fiber is completely dyed
Dyeing
dyestuffs react and combine with in a water solution
*Depth of shade
darkness or lightness of colour
*Substrate
ratio of the weight of fiber to quantity of dye
dye classes
dyes are grouped by color fastness characteristics and by those applied with similar techniques
Affinity
dye capable of combining with a particular fiber
Dye classes
dyes are grouped by color fastness characteristics and by those applied with similar techniques
lab dip
sample swatch of finished dyeing
*Standard:
future orders must conform
Dye lot
new batch
*Computer-management systems:
color and shade matching systems
*Color-management systems:
aids in maintaining high color standard and lot-to-lot shade consistency
*Spectrophotometer
instrument measures percent of reflected light in visible spectrum
*Metamerism
two colors match under one light condition but look different in another light
Color flare
change in color of fabric because of a change in light source
Color-matching booth
box-type device used to test for metamerism
Macbeth Lamp
name of original Color-matching booths
Fiber Dyeing
Process of Dyeing Fibers prior to spinning to yarns
Dye penetration is excellent
High amount of dye is used
Costlier than yarn, fabric and product dyeing
Process is not suitable for quick reponse
Stock Dyeing
dyeing fibers before it is spun into yarn
Top Dyeing
dyeing fiber before it is spun into yarn to produce heather colors
Top – fibers of wool from which shorter fibers have been removed
forms of yarn dyeing
yarn, skein, package, beam
form of stock dyeing
Top dyeing
Yarn Dyeing
dyeing of yarns before they are woven or knitted
Provide adequate color absorption and penetration
Skein Dyeing
immersing skeins (loosely wound hanks) into dye vats
*Package Dyeing
yarn wound on small perforated spool (package)
*Flow of dye bath alternates direction
Beam Dyeing
entire warp beam wound onto perforated cylinder to go in beam-dyeing machine. Larger version of package dyeing
fabric piece dyeing
jet, jig, pad, beam, continuous dying and continuous dye system
Piece Dyeing
dyeing cloth after it is woven or knitted
Very economical
Most common method of dyeing solid colors
Process is suitable for quick response
Jet Dyeing
fabric is circulated in rope form on jet flow of the dye bath
Jig Dyeing
fabric is passed through a stationary dye bath (not immersed in the dye bath)
Pad Dyeing
fabric passes through dye bath and then through rollers where dye solution is squeezed into it
Continuous dye system
large quantities of fabric run continuously
Beam dyeing
fabric wound onto perforated cylinder, then dye bath is forced through the stationary fabric layers
Continuous Dyeing
fabric travels through dyeing process without stopping
product dyeing
Garment dyeing
*Garment Dyeing
dyeing of completed garments such as hosiery, T shirt, sweaters etc
Ideal for quick response
Not suitable for apparel with many components
special dying effects
cross dyeing, Union dyeing, tone-on-tone effects
cross- dyeing
fabric of two fiber types having different dye affinities is dyed in a single bath of different dyes classes
*Produces multicolor effects
Method of dyeing blend or combination fabrics to two or more shades
Uses dyes with different affinities for different fibers.
union dyeing
two classes of dye in same color to produce one color
Method of dyeing a fabric containing two or more type of fibers or yarns to the same shade so as to achieve the appearance of the solid colored fabric
Used to dye solid colored blends and combination fabrics
tone-on-tone effects
one dye bath to produce different tones in fabric by using fibers with different affinity
Pigment Coloring
insoluble in water and do not combine with the textile fiber
solution dyeing
part of the manufacturing process
*Coloring agent is added to liquid spinning solution before fiber is extruded from a spinnerette
benifits of solution dyeing
Excellent color fastness
More expensive
Used for difficult to dye manufactured fibers such as olefin
Environmental friendly process
Colorfastness
ability of dyed or printed textile to resist color loss or fading
