printing and dyeing techniques: Flashcards
what is hand dyeing?
when the fabrics are immersed in hot or cold water in a dye bath by hand- then the fabric is removed from the dye and rinsed to remove excess dye. then it is dried.
what are hand dyed fabrics fixed with?
mordant or a fixing agent like salt
what is the strength of dye determined on?
-amount of time in the dye bath
-absorbency of the fibres
-original fabric colour
-concentration of the dye
-effective use of mordant or fixative
before colour can be applied to a fabric what needs to happen?
the fabric needs to be cleaned to remove natural impurities and dirt and oil picked up from the machines during manufacturing. otherwise the colour will not attach itself to the fabric
what is dyeing?
the permanent application of colour to a fibre or fabric to give a uniform colour.
what is colour fastening?
the strength in which the dye is held inside the fibre
what is spin dyeing?
the dye is put into the spinning solution of synthetic fibres
what is stock dyeing ?
fibres are dyed before being spun into yarn
what is yarn dyeing?
yarns are dyed before being made into fabric
what is piece dyeing?
the dyeing of fabrics
what is garment dyeing?
made-up garments are dyed according to demand for different colours.
what is tie-dye?
fabric being folded or twisted then tied to stop dye reaching some parts of the fabric
what is batch dyeing?
fabrics are dyed to order in large batches
what is batch dyeing used for?
fabrics that have to change colour frequently because of fashion
what are the benefits of rotary screen printing?
-it’s a very fast process which is used in continious printing
what is screen printing?
a pattern is printed onto a fabric using a stencil held in place by a screen. each screen prints one part of the design
after applying the printing dye from screen printing what do you need to do?
fix the design into place using steam or dry heat
what are the three advantages of printing?
-there are more opportunities for designing
-more colours can be used
-complex designs can be produced
what are the 4 main types of fabric printing?
-screen printing
-roller print
-sublimation print
-digital print
what is roller print?
engraved copper rollers that are full width of the fabric are coated with printing paste and rolled over the fabric
what is sublimation print?
the design is printed onto a special paper and transferred to fabric using a heat press. the heat turns the dye into a vapour which is transferred to the fabric
what fabric does sublimation print work best on?
polyester or other fabrics made from synthetic fibres
what is digital print?
a pattern is designed on a computer then printed straight onto the fabric. the colour is fixed in the fabric using steam.
what is digital printing only suitable for?
small amounts of fabric
what things must be taken care of when screen printing?
-print must be the correct size and placed accurately on the product
-colour is even and not smudged
-need to be careful as the print is repeated, small mistakes can quickly become large errors along the length or width of the fabric
what is tie dye also known as?
resist dyeing
what is resist dyeing?
resisting the fabric by tying it off which stops the dye penetrating certain areas of the fabric to produce a pattern
what is batik?
hot wax or flour paste is used to draw pattern onto a fabric before it is dyed- it can prevent dye from reaching some parts of the fabric
what is batik also known as?
resist dyeing
