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bamboo fabric manufacturing its dyeing and end uses.a gift for textile students.
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Regenerated Cellulose Fiber.
Made from 100% Bamboo through high-tech process.
Natural Antibacterial
Eco- friendly & green
Soft hand feel and Shiny appearance
High moisture regain ( i.e. 13.03%)
INTRODUCTION
The fastest growing grass and can shoot up a yard or
more a day.
Bamboo grows rapidly and naturally without any pesticides, herbicides or fertilizers.
Growing bamboo improves soil quality and helps rebuild eroded soil.
Bamboo plants absorb about 5 times the amount of carbon dioxide (a primary greenhouse gas) and produces about 35% more oxygen than an equivalent stand of trees.
Why Bamboo?
Bamboo fabric has a natural sheen and softness that feels and drapes like silk but is less expensive and more durable
Bamboo clothing is easy to launder
Bamboo is naturally anti-bacterial and anti-fungal
Bamboo is highly absorbent and wicks water away from the body. In warm, humid and sweaty weather, bamboo clothing helps keep the wearer drier, cooler and more comfortable and doesn’t stick to the skin
Why Bamboo?
Bamboo tree---cutting into bamboo sheet---
(hydrolyzing --- stewing --- Bleaching)---pulp --- (saturate) ---Cellulose--- (dissolving---spinning---Cutting) --- after treatment (washing--- oil adding---drying-)---bamboo fiber---Packing
Production Flow Chart
Production Flow
There are two ways to process bamboo to make the plant
into a fiber
Mechanically
Chemically
MANUFACTURING
Crushing the woody parts of the bamboo plant
Using natural enzymes to break the bamboo walls into a mushy mass
Then natural fibers can be mechanically combed out and spun into yarn
Mechanical Manufacturing
Eco-friendly manufacturing process
Bamboo fabric made from this process is sometimes called bamboo linen
It is more labor intensive and costly
Mechanical Manufacturing
The general process for chemically manufacturing bamboo fiber using hydrolysis alkalization with multi-phase bleaching technology – which is the dominate technology for producing regenerated bamboo fiber
Chemical Manufacturing
Bamboo leaves and the soft, inner pith from the hard bamboo trunk are extracted and crushed
Chemical Manufacturing Steps
The crushed bamboo cellulose is soaked in a solution of 15% to 20% sodium hydroxide at a temperature between 20 degrees C to 25 degrees C for one to three hours to form alkali cellulose
Chemical Manufacturing Steps
The bamboo alkali cellulose is then pressed to remove any excess sodium hydroxide solution. The alkali cellulose is crashed by a grinder and left to dry for 24 hours
Chemical Manufacturing Steps
Roughly a third as much carbon disulfide is added to the bamboo alkali cellulose to sulfurize the compound causing it to gel
Chemical Manufacturing Steps
Any remaining carbon disulfide is removed by evaporation due to decompression and cellulose sodium xanthogenate is the result
Chemical Manufacturing Steps
A diluted solution of sodium hydroxide is added to the cellulose sodium xanthogenate dissolving it to create a viscose solution consisting of about 5% sodium hydroxide and 7% to 15% bamboo fiber cellulose
Chemical Manufacturing Steps
The viscose bamboo cellulose is forced through
spinneret nozzles into a large container of a diluted sulfuric acid solution which hardens the viscose bamboo cellulose sodium xanthogenate and reconverts it to cellulose bamboo fiber threads which are spun into bamboo fiber yarns to be woven into reconstructed and regenerated bamboo fabric
Chemical Manufacturing Steps
Chemically manufactured bamboo fiber is a regenerated cellulose fiber similar to rayon or modal.
Chemically manufactured bamboo is sometimes called bamboo rayon
Chemical Manufacturing Steps
IMPORTANT CONSIDERATIONS:
Sensitive to both alkali and acid, so volume of alkali in pretreatment must be noticed.
Lower wet tensile strength; so negative tension during dyeing and pre treatment must be lower adopted.
Only recommended reactive dyestuff must be used in dyeing.
Pretreatment and Dyeing
SINGEING : moderate condition to avoid damaging of bamboo fiber
DE-SIZING: Enzyme de -sizing rate should be high over 80%.
SCOURING: pure bamboo normally need no scouring, sometimes wash it with a little alkali (i.e. not exceed 10g/l)
General Principles in pretreatment and dyeing
BLEACHING: the processing should be made in terms of the specification and thickness of fabrics.
MERCERIZING: the fabrics of bamboo fibers normally should not need mercerized due to their sound luster and bad anti -alkaline properties. However, some cases are found in order to increase their absorbance capacity to dyestuff.
DYEING : Ideally use active dyestuffs during dying process - alkali should not be over 20g/liter, temperature should not be over 100°C. During drying process, low temperature and light tension are applied.
General Principles in pretreatment and dyeing
Dyeing of 100% Bamboo Fabric
As cotton and bamboo are both cellulosic fiber ,same chemical structure so all the dyestuff which is suitable for cotton can be use to dye bamboo
Dyeing
Dyeing of BAMBOO/Cotton Fabric: Compared with cotton fiber, bamboo fiber
belongs to multi holed textured fiber thus having bit lower dyeing degree and slow dye taking up speed then cotton.
This cause double colour in dyeing of bamboo/cotton blend fabric.
So right dyestuff should be selected which has similar absorbance and similar fixation temprature/time to both cotton and bamboo.
Dyeing
Reactive Dye: 0.5%
Glauber ('s )salt: 20g/L
Dyeing additives: 2g/L
K2CO3 10g/L (PH=9) or use Enzyme
Recommended formula
Recommended conditions
Dyeing Curve
Cibacron Yellow FN-2R
Cibacron Red FN-R
Cibacron Blue FN-R
Cibacrone Marine W-B
Cibacrone Black W-NN BC
Dyestuff
Color Fixation Rate:
Color Fastness:
Dyeing
Softner : hydrophilic type
Whitener: same as whitener for cotton fabric
Heat - set Temperature :
The best heat - set temperature for bamboo fiber is 110~120C. Or for a
very short time under 160C temperature. And the washing temperature
is 40~60C
General Principles in after treatments
Towel and Bathrobe : 30%
Socks: 20%
knitted clothes( sweater, T-shirts and underwear): 15%
Bed sheet or bed cover: 10%-15%
Weaving clothes: 8%
Others: 9%-12
Products
Products
