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33 Cards in this Set
- Front
- Back
Sewing threads are designed to...
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-pass rapidly through the machine
-form a stitch effectively - function in a product without distorting/breaking through its lifespan |
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Thinnest thread possible is best to use because....
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Thread sits 'lower' and so is less visible & less susceptible to abrasion. Also, smaller needle has less effect on the look & quality of the fabric.
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Breaking strength of a seam should be...
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LESS than the breaking strength of the fabric - easier to repair.
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advantages of textured yarns...
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higher stretch & bulk
provide greater cover & opacity improved breath-ability & absorption than regular filament yarn. better insulation softer hand characteristics of a spun yarn. |
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disadvantages of textured yarns...
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Tendency to snag & pull due to long filament fibres
poor abrasion resistance possible growth problem through lifespan of product (stretch/distortion & not revert to original shape) |
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Micro-fibre yarns are...
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mono/multifilament yarns with very small diametre - smaller than silk.
can be blended with cotton or wool to provide softness & fluidity good for lining fabrics |
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Yarns are defined as....
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a continuous length of fibres/filaments with or without a twist.
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types of yarns...
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-single
-ply -cable -core-spun -fancy |
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thickness & tightness of twist in a yarn affect a fabric's...
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- weight
- flexibility - handle - texture |
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S twist is.....
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Anti clockwise
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z twist is....
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clockwise
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Highly twisted yarns are
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stronger/harder/thinner
used for weaving as they can withstand the tension of a loom. |
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Lower twisted yarns are...
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softer/bulkier
used for weft yarns or knitting |
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Spun yarns are....
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made by spinning together staple fibres.
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Filament yarns are.....
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made from continuous filaments of silk/synthetic fibres.
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filament yarns can be....
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mono-filament (single fibre)
multi-filament (multiple fibres) |
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Moral issues means...
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Thinking about how a product will affect the environment & people/cultures, concerning the way that the product is designed & manufactured i.e Safe environment/comfort/wellbeing of factory workers
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Marketing means...
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promoting, advertising & selling a product
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Natural fibres...
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Hair - alpaca/llama/angora/mohair
Cellulose - bast(linen)/leaf/seed(cotton) Protein - Silk/wool Mineral - Asbestos |
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Man made fibres....
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Synthetic -polyester/flourocarbon/kevlar/nylon etc....
Regenerated - Lyocell/modal/viscose Inorganic-carbon/metallic/ceramic/glass |
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Denier System...
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Direct system - Higher number = thicker/heavier yarn
1 denier yarn = 9,000m of it would weigh 1g |
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tex system...
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direct system
grams per 1,000 m |
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planned obsolescence means....
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when a product is designed to last for a certain amount of time
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Ergonomics means....
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how a product works with the body
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Single yarns are...
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a continuous single thread of twisted staple fibres/continuous filament fibres
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yarn ply means....
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when single yarns are twisted together.
2 single yarns = 2ply 3 single yarns = 3 ply and so on... *Higher ply = stronger & thicker* |
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Core spun yarns are....
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made from a core filament yarn, with two spun yarns twisted around it.
stretch fabric could be made from this type of yarn... elastane core & covered by another fibre yarn. core spun fabrics enhance a fabric - more comfort. |
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strong sewing threads are made from....
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core spun threads...
Polyester core for strength, covered by cotton to protect the polyester from being melted by the needle at high speeds. |
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Elastane is always....
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blended with another type of fibre
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False twist is...
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most widely used for producing textured yarns in finer deniers.
yarns are: --twisted--heatset--untwisted-- |
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novelty/fancy yarns have...
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no uniform thickness and appearance. They have deliberate irregularities throughout, eg. bumps/knots/curls.
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novelty yarns produce...
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fabrics with interesting & decorative surface effects.
However... they are not very durable & are susceptible to abrasion & wear. |
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Types of novelty yarns include....
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- slub yarn
-chenille yarn -bouclé yarn |