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Questions and Answers
What is the function of mordants in the dyeing process?
What is the function of mordants in the dyeing process?
- To increase the cost of dyeing
- To remove the color from the fiber
- To reduce the environmental concerns
- To bind the dye to the fiber (correct)
What is the main difference between dyes and pigments in textile dyeing?
What is the main difference between dyes and pigments in textile dyeing?
- Dyes are incorporated into the fiber, while pigments stick to the fabric (correct)
- Dyes are mixed with resin, while pigments undergo a curing process
- Dyes have environmental concerns, while pigments do not
- Dyes have higher color fastness than pigments
What is the primary source of natural dyes used in textile dyeing?
What is the primary source of natural dyes used in textile dyeing?
- Flowers and berries (correct)
- Chemical agents
- Resin binder
- Perspiration and air pollution
Which factor affects the color fastness of textiles under different conditions?
Which factor affects the color fastness of textiles under different conditions?
What is the purpose of treating textile material in an aqueous solution during dyeing?
What is the purpose of treating textile material in an aqueous solution during dyeing?
What is the purpose of a carrier in textile dyeing?
What is the purpose of a carrier in textile dyeing?
Which type of dyes is mostly used for wool and silk?
Which type of dyes is mostly used for wool and silk?
What is the function of auxiliaries in the dyeing process?
What is the function of auxiliaries in the dyeing process?
What does the M:L ratio of 1:20 mean in textile dyeing?
What does the M:L ratio of 1:20 mean in textile dyeing?
What is the main difference between pigment dyes and other types of dyes?
What is the main difference between pigment dyes and other types of dyes?
What is the purpose of a mordant in textile dyeing?
What is the purpose of a mordant in textile dyeing?
What is the main difference between disperse dyes and basic dyes in textile dyeing?
What is the main difference between disperse dyes and basic dyes in textile dyeing?
What is the function of pigment dyes in textile dyeing?
What is the function of pigment dyes in textile dyeing?
What is the primary factor in selecting dyes for textile dyeing?
What is the primary factor in selecting dyes for textile dyeing?
What is the main difference between textile dyeing and printing?
What is the main difference between textile dyeing and printing?
Flashcards
Mordant Function
Mordant Function
Mordants bind the dye to the fiber, improving color fastness.
Dyes vs. Pigments
Dyes vs. Pigments
Dyes incorporate into the fiber structure, while pigments adhere to the fabric surface.
Natural Dye Source
Natural Dye Source
Flowers and berries are a common source of natural dyes.
Color Fastness Factor
Color Fastness Factor
Perspiration can affect how well colors stay on textiles.
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Aqueous Solution Purpose
Aqueous Solution Purpose
Treating textile material in an aqueous solution is to mix fiber, yarn or fabric with water, dye & chemicals for a fixed time duration.
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Carrier Purpose
Carrier Purpose
Carrier promote the dyeing of hydrophobic fibers
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Dyes for Wool and Silk
Dyes for Wool and Silk
Acid dyes are commonly used for wool and silk.
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Auxiliaries Function
Auxiliaries Function
Auxiliaries facilitate and modify the dyeing process.
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M:L Ratio 1:20 Meaning
M:L Ratio 1:20 Meaning
It means 20 liters of dye liquor is required for 1 kg of material.
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Pigment Dyes
Pigment Dyes
Pigment dyes do not require a mordant for fixation.
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Mordant Purpose
Mordant Purpose
Mordants increase the fastness of the dye to the fiber.
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Pigment Dye Function
Pigment Dye Function
Pigment dyes hold color to the fabric using resins and high temperature.
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Dye selection
Dye selection
Coloration is the main factor in selecting dyes for textile dyeing.
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Dyeing vs. Printing
Dyeing vs. Printing
Textile dyeing and printing differ in their styles of application: one uses a solution (aqueous) known as the dye liquor or dye bath, and the other uses direct application in a paste form.
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Textile Dyeing
- The process of dyeing involves the use of dyestuffs and the treatment of textile material in an aqueous solution.
- Fibre, yarn, or fabric is mixed with water, dye, and chemicals for a fixed time duration.
Colour Fastness
- Colour fastness refers to the ability of a colour to retain its original shade under different conditions.
- Factors affecting colour fastness include perspiration, dry cleaning, air pollution, rubbing, and water.
Mordants
- A mordant is a chemical agent that binds the dye to a fibre, which otherwise has little or no affinity for the dye.
- Mordants are essential for dyeing textile materials.
Natural Dyes
- Primitive people obtained dyes from natural sources such as flowers, nuts, berries, and roots.
- Examples of natural dyes include indigo, alizarin, saffron, madder, logwood, and catechu.
Factors Affecting Dye Selection
- Textile affinity: the ability of a dye to bind to a specific fibre.
- Colour fastness: the ability of a colour to retain its original shade under different conditions.
- Cost: the financial expense of using a particular dye.
- Ease of application: the complexity of the dyeing process.
- Environmental concerns: the impact of the dye on the environment.
Pigments
- Pigments are microscopic, insoluble, coloured particles that are made to stick to the fabric.
- Pigments are usually mixed with a resin binder and applied to fabrics as a solid colour or print.
- The resin must be heated in a process called curing to adhere the pigment to the fabric.
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