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treatments routinely applied to fabrics to prepare them for dyeing and finishing |
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remove: natural oils & waxes, fiber impurities and color, manmade additives |
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1. Desizing 2. Scouring 3. Bleaching 4. Mercerizing 5. Singeing 6. Calendering |
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Which preparation is not required for knits? |
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What chemical is usually used for bleaching? |
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strength, luster, dyeability (absorbency) |
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main reason for mercerizing? |
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the process of applying color to fibers, yarns fabrics or garments |
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who invented synthetic dyes |
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less expensive, more readily available and more uniform |
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manufactured fibers are _____ dyed |
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Wool is often _____ dyed. |
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Tweed has to be _____ dyed. |
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Advantage of fiber/stock dyeing? |
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Disadvantages of fiber/stock dyeing? |
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Fiber/stock dyeing process |
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loose fibers are collected in a pressure cooker machine and the dye is circulated |
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How to identify fiber/stock dyeing? |
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unravel a yarn - and look to see if there are different colors of fibers in the yarn |
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Stock dyeing refers to... |
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Stripes and plaid are _____ dyed. |
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package dyeing refers to... |
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2 methods for yarn/package dyeing |
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dyeing a cone of yarn vs yarns dropped in vat, dye circulates throughout yarn |
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how to identify package/yarn dyeing |
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unravel and look for different colored yarns (as opposed to fibers) |
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yarn/package (alternates rows of yarn - dyed yarn in warp and filling direction) |
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piece dyeing refers to... |
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most common form of dyeing |
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fabric/piece dyeing (fast and economical) |
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how to identify fabric/piece dyeing |
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fabric will be the same color on the front and the back |
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methods of fabric/piece dyeing |
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batch fabric/piece dyeing |
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all steps done in a single vessel |
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fabric/piece dyeing steps |
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dye application, fixations and rinsing |
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beam - roll of fabric lowered into dye batch, dye circulates from inside out, fixation + drying at same time jet - jet of dye forces fabric through machine and color comes in contact with fabric |
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which is more common beam or jet? |
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continuous piece/fabric dyeing |
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separates individuals steps into separate components of a continuous dyeing range |
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Hosiery and t-shirts are typically __ dyed. |
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Why did garment dyeing come about? |
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quick response to fashion change (shorter lead time) |
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how to identify garment dyeing |
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look at the labels, they will be partially dyed |
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Two ways of dyeing blends |
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cross dyeing and union dyeing |
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which is more common, cross or union dyeing |
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when different fiber types in a blend are dyed different colors |
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when different fiber types in a blend are dyed the same color |
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Two dyeing considerations |
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a level dyeing produces the ame shade on the entire batch of material |
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the ability of a dyed textile to retain its shade and depth of shade during use and care |
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fastness is determined in respect to... |
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light, laundering, dry cleaning, bleach, perspiration... |
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application of mechanical or chemical treatment to fabrics to enhance their appearance or performance |
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application of color to certain portions of a textile product creating a design; primarily done for fabrics (and garments) |
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Most common commercial method of printing |
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Screen printing (primarily rotary) |
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flat bed printing process |
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screen is prepared using photographic resist process, one screen for each color, fabric moves along table from one screen to the next, like a stencil |
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screens prepared, shaped into cylinder (one for each color) fabric runs under a series of rotating screens, dye applied to rotary screens from inside cylinder - forced through screen with squeegee |
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when the screens are out of sync and the pattern components won't line up correctly its called ___ |
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separate screen provides background color to design (type of screen printing) |
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when a fabric is piece dyed and then printed over its called ________ |
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thickened bleach is printed onto previously dyed fabric and the color is discharged (removed) wherever the bleach is applied |
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design printed onto paper, using dyes instead of pigment, printed paper and white fabric run together through heated ovens, dyes vaporize and transfer to the fabric |
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which printing process is very detailed, almost like a photograph |
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which type of printing is also called paper printing |
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no screens required, quick responses, short yardages, expensive ink, few color choices, slower than rotary, new method |
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printing warp yarns before the fabric is woven, the designs have indistinct outlines |
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developed in JAVA, wax is used as the resist material |
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probably developed in India, tied strings or rubber bands are used as resist materials |
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direct printing, like a stamp, design carved into a block, area between design elements cut away leaving design elevated, dipped into dye then pressed onto fabric |
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classification of finishes |
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mechanical versus chemical; durable versus nondurable |
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fabrics are passed between 2+ rollers (often made of stainless steel and heated) |
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like ironing, removes wrinkles; damp fabric goes under rollers and comes out pressed |
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engraved rollers (250 diagonal lines per inch) provide surface luster and soft hand |
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calendering process, start applied to fabric, high speed friction calender provides polished surface, spinning while fabric moves underneath |
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Chintz is made with which calendering process? |
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resin applied to fabric, polished to a high gloss wet look or patent leather look |
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one engraved roller with raised pattern is used with a second soft roller, pattern is pressed into fabric |
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2 unbalanced plain weave fabrics are pressed together, crushing the ribs; water marker or wood grain look |
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Napping, Sanding and Shearing |
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small bent wires on rollers pull fibers from yarns to produce a dense pile on fabric surface |
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Sanding/Sueding/Buffing/Peachskin |
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Sandpaper covered rolls = shorter pile |
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follows napping, produces uniform and level pile |
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acid printed onto cellulosic fabric causes open areas and design effects |
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cotton printed with NaOH causing fabric to shrink in printed areas and pucker in unprinted areas |
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shrinkage control, fabric overfed into a cylinder between two blankets and steamed to accelerate shrinkage |
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finish that minimize felting by either damaging/dissolving the scales or coating the scales with resin |
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thermoplastic fabrics will hold their new dimension unless exposed to a higher temperature (nylon, olefin, polyester) |
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Chemical application forms |
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1) pad-dry cure and 2) foam |
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unfinished roll of fabric goes into a chemical/pad bath, is saturated picking up water and chemical finishes, squeeze rollers squeeze out excess liquid nad then into a oven to fix the finish |
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a knife pushes the foam onto the fabric which goes through rollers that press the foam into the fabric and the put in a curing oven where the chemicals are fixed |
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Advantages of foam application |
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don't have to get fabric soaking wet, uses less water, easier curing and drying, less energy required, different finishes for front + back if desired |
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Wrinkle Resistant is also called... |
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Durable Press, Wash and Wear, or Wrinkle free |
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Benefits of wrinkle resistant |
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decreases wrinkles, minimizes care (less ironing) and decreases shrinkage |
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Wrinkle Resistant Disadvantages |
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decrease strength & abrasion, more expensive, attracts oily soil, requires formaldehyde |
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Soil Resistant vs. Soil Release |
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resistant - prevents wetting, water beads up, all fibers, applied by manufacturer or consumer release - increases absorbency, water soaks in, manmade only, manufacturer application only |
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how are waterproof finishes achieved? |
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with polyurethane or file coating to the surface |
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what finish is often used on high count fabrics? |
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differences between water-proof and water repellent |
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waterproof is nonbreathable, and there is no water penetration... water repellent only resists penetration but is pliable, breathable and light weight |
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capillary action in a fabric carries moisture away form the skin |
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how is moisture management achieved? |
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changes the chemical composition of a fabric - gives it a slight negative charge so the fabric pulls away from the skin |
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CPSC - Consumer Product Safety commission |
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what does the FFA apply to |
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all apparel, children's sleepwear, mattresses, carpets + rugs |
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forbids the sale of any dangerously flammable textiles |
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how does FR finishes work? |
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they break the burning cycle by: - decreasing formation of flammable gases or producing inert gases that dilute the gases fueling the fire |
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FR finishes are adversely affected by: |
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laundering (bleach, softeners, hot water/dryer, soap- use detergent) and overexposure to sunlight and soil |
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how do microencapsulated finishes work? |
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incorporates materials in tiny capsule form that are sprayed on and held with a binder, the use ruptures the capsules |
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Examples of microencapsulated finishes |
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fragrance, lotions, oils, antimicrobial, antiodor, insect repellent |
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enzyme technology is used for |
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desizing and scouring, retting flax, degumming silk, biopolishing and detergents + presoaks |
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what are the environmental benefits of enzyme technology |
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works in mild conditions (temp and pH), replaces toxic/harsh chemicals, 100% biodegradable, small doses required |
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Nanotechnology finish examples |
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improves water or stain resistance, moisture management, wrinkle resistant, antimicrobial (odor + mildew), colorfastness, reduce pilling and improve strength |
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example of Nanotechnology trade name |
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Nanotex - reduces pilling |
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Examples of special purpose finishes |
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antistatic durable, antimicrobial, light reflectant, UV absorption, phase change, heat reflective, moth proofing |
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examples of products with antimicrobial finishes |
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medical textiles, wipes + towels, workout clothes, outdoor textiles, carpets, mops, filters |
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trade name example of light reflective |
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fiber damage, dye fading and skin exposure |
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trade name example of UV absorption |
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UPF good, very good and excellent |
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cotton t-shirt, blue jeans and polyester shirt UPF's |
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What do phase change finishes do? |
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minimize heat flow through a fabric, absorbs or releases heat as they undergo phase change |
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tradename example of phase change thermal finish |
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Underfire - used in long underwear |
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