Physical, Chemical & Thermal Properties Of Cotton
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| Physical, Chemical & Thermal Properties Of Cotton |
Composition:
In the chemical structure of cotton, the maximum portion is cellulose and the rest is composed of different types of dust and wax like materials. The whole chemical construction of cotton can be described as follows:- Cellulose:80-90 %
- Waxes & Fats: 0.5-1 %
- Proteins: 0-1.5 %
- Hemicelluloses & Pectin€™s: 4-6 %
- Water: 6-8 %
- Ash & Mineral Matters: 1-1.8 %
Physical Properties:
- Specific gravity: 1.52-1.55
- Strength (Tenacity): 3.0 - 4.9 g/d (Cotton is 20% stronger when wet). Fiber elongation is almost linear to the stress imposed
- Elasticity: Relatively low
- Absorbency and MR%: 7-8% at standard conditions
- Birefringence: 0.046
- Dielectric constant: 3.9-7.5
- Resistivity: Order of 109 ohm/cm3
- Micronaire: 2.0 - 6.5 (upland cotton)
- Denier: 0.7 - 2.3 (upland cotton)
- Length: 0.9 - 1.2 in (upland cotton)
- Diameter: 9.77 - 27.26ÃÂĩm
- Coefficient of friction: 0.25 (for raw dry cotton, otherwise strongly changes for treated and/or wet fiber)
- Breaking Extension: 5-7%
- Resiliency: Relatively low
- Dimensional Stability: Medium
- Abrasion Resistance: Better
āĻĢাāĻāĻŦাāϰ āĻāĻŦং āĻেāĻ্āϏāĻাāĻāϞ āĻĢাāĻāĻŦাāϰ āĻāϰ āĻŽāϧ্āϝে āĻĒাāϰ্āĻĨāĻ্āϝ | Difference between Fiber and Textile fiber
Chemical Properties:
Effect of Bleach: Cotton fiber is resistant to bleach & H2O2 , NaOCl , NaClO2 , Ca(OCl)Cl are used as bleaching agents.
Effect of Acid: Cotton fiber is dissolved in high concentrated mineral acid but organic acid cannot dissolve it.
Effect of Alkali: Cotton fiber is resistant to alkali. Scouring is done by using alkali for removing impurities.
Effect of Heat: Cotton fiber burns rapidly in air. It begins to turn yellow after several hours at 120oC and decomposes at 150oC.
Effect of Sunlight: Cotton fiber can absorb heat and energy from sunlight. But excess application of sunlight may degrade the polymer system of fiber as it is attacked by the UV- ray of sunlight.
Effect of Organic Solvent: Cotton fiber is well resistant to most organic solvent.
Dye ability: Reactive, Direct, Vat, Azoic, Mordant Dyes are used to dye cotton fiber. But the best dye for cotton fiber is Reactive Dye.
Thermal Properties:
- Cotton requires particular temperature, humidity and possibly ventilation conditions.
- Favorable travel temperature range: no lower limit < 25ðC
- Optimum travel temperature: 20ðC
- Auto ignition temperature (for oily cotton: 120ðC
- Glow temperature: 205ðC
- Fire point: 210ðC
- Ignition temperature: 407ðC
At temperatures > 25ðC, cotton dries out, becomes hard and brittle and losses elasticity. Light causes the same deterioration. The optimum temperature for mold development is 25 - 35ðC.
Cotton is subject to self-heating/spontaneous combustion. The auto ignition temperature of oily cotton is 120ðC.
At temperatures < 0ðC there is no risk of wet bales rotting, since this process stops at low temperatures. In some cases, damaged cotton has been placed in intermediate cold storage, so preventing rot.
Every hold should be equipped with means for measuring temperature. Measurements must be performed and recorded daily.
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➤ āĻেāĻ্āϏāĻাāĻāϞ āĻĢাāĻāĻŦাāϰ āĻāϰ āĻŦৈāĻļিāώ্āĻ্āϝāϏāĻŽূāĻš
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➤ Physical, Chemical & Thermal Properties Of Cotton
➤ āĻŦিāĻিāύ্āύ āĻĒ্āϰāĻাāϰ āĻĢাāĻāĻŦাāϰেāϰ āϏাāĻĨে āĻĒāϰিāĻিāϤি
➤ āĻেāĻ্āϏāĻাāĻāϞ āĻĢাāĻāĻŦাāϰ āĻি? āϏ্āĻ্āϝাāĻĒāϞ āϞেāύ্āĻĨ āĻāϰ āĻāĻĒāϰ āĻিāϤ্āϤি āĻāϰে āĻĢাāĻāĻŦাāϰ āĻāϤো āĻĒ্āϰāĻাāϰ?
➤ āĻেāĻ্āϏāĻাāĻāϞ āĻāϰ āĻĢাāĻāĻŦাāϰ āϏāĻŽ্āĻĒāϰ্āĻিāϤ āĻিāĻু āϤāĻĨ্āϝ
➤ Morphological Structure Of Jute Fiber
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āĻĒ্āϰাāĻৃāϤিāĻ āĻĢাāĻāĻŦাāϰ āĻাāĻে āĻŦāϞে āϰিāĻেāύাāϰেāĻেāĻĄ āĻĢাāĻāĻŦাāϰ āĻি āϏ্āĻ্āϝাāĻĒāϞ āĻĢাāĻāĻŦাāϰ āĻি āĻ āĻĒāĻিāĻ্āϝাāϞ āĻĢাāĻāĻŦাāϰ āĻāϤ āĻĒ্āϰāĻাāϰ āĻĢাāĻāĻŦাāϰ āĻŦা āϤāύ্āϤু āĻাāĻে āĻŦāϞে
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➤ āĻেāĻ্āϏāĻাāĻāϞ āĻĢাāĻāĻŦাāϰ āĻāϰ āĻŦৈāĻļিāώ্āĻ্āϝāϏāĻŽূāĻš
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➤ Physical, Chemical & Thermal Properties Of Cotton
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➤ āĻেāĻ্āϏāĻাāĻāϞ āĻĢাāĻāĻŦাāϰ āĻি? āϏ্āĻ্āϝাāĻĒāϞ āϞেāύ্āĻĨ āĻāϰ āĻāĻĒāϰ āĻিāϤ্āϤি āĻāϰে āĻĢাāĻāĻŦাāϰ āĻāϤো āĻĒ্āϰāĻাāϰ?
➤ āĻেāĻ্āϏāĻাāĻāϞ āĻāϰ āĻĢাāĻāĻŦাāϰ āϏāĻŽ্āĻĒāϰ্āĻিāϤ āĻিāĻু āϤāĻĨ্āϝ
➤ Morphological Structure Of Jute Fiber

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