Softener is an finishing agent that when applied to textile material improves its handle giving pleasing touch. As a general rule, the softening agents applied are lubricating agents, which facilitate the fiber sliding within the fabric structure, thus granting easier deformation and creasing of the fabric.
this slide in mercerization is prepared in chemical processing in textile and it could help a lot of students or lecturers who might be looking for web handout, presentation or seminar. it is openly accessible for all.
this slide in mercerization is prepared in chemical processing in textile and it could help a lot of students or lecturers who might be looking for web handout, presentation or seminar. it is openly accessible for all.
Basic knowledge about blend dyeing
Dyeing of Blended Fibres & Fabrics
Blends:
Blends are any textile material from fiber through yarn to fabric which are deliberate combination of chemically or physically different fibrous polymer. Cotton and Polyester blend is an example of chemically different blend and Cotton and Viscose is physically different blend because both are cellulosic.
Reason for blending:
1.Economy: The dilution of an expensive fibre by blending with a cheaper substitute.
2.Durability: The incorporation of a more durable component to extend the useful life of a relatively fragile fibre.
3.Physical properties: A compromise to take advantage of desirable performance charactristics contribuition by both fibre components.
4.Color: The development of new fabric design for garments incorporating multicolor effect.
5.Appearance: The attainment of attractive appearance & perceptible qualities using combinations of yarns of different lusture, crimp or denier which still differ in appearance even when dyed with same color.
6.Other reasons-
Blending develops fibre properties.
Colorant modification is possible by blending.
Finishing process modification.
Improved moisture absorption, antistatic characteristics, reduced pilling, improved abrasion resistance.
Dyeing Possibilities with Blends:
1.Union Dyeing:
• This is suitable for fabrics containing two fibres to dye them in a single uniform colour, each dye suitable for one kind of fibre in the blend.
• Union dyeing is same as cross dyeing except that instead of multi-colour effects. One solid colour is produced. The dyer accomplishes this by using two or more classes of dye, each of the same colours.
• Different fibres may require different dyes to obtain the same colour; this may be done by putting the appropriate colour dye that is specific to each type of fibre in to one dye bath.
• For eg: a fabric composed of rayon and acetate can be dyed with a solid colour green by using a direct dye for the rayon, and a disperse dye of the same colour for the acetate.
2.Resist/Reserve dyeing:
• In resist dyeing at least one (but not all) of the components of the blend remains essentially undyed i.e almost white.
3.Cross dyeing:
• Cross dyeing produces fibres of contrasting color
• This is two types-
a)Shadow effect/Tone-in-Tone dyeing:
Two fibres are dyed in same hue & brightness but the depth is different. It is called tone-in-tone or shadow effect.
b)Contrast effect:
Two fibres are dyed with strong difference in hue, brightness & depth.This is called contrast effect. Pleasing final appearance is important here.
Styles of printing; Printing thickeners including synthetic thickeners; Printing auxiliaries; Printing of cotton with reactive dyes, wool, silk, nylon with acid and metal complex dyes, Printing of polyester with disperse dyes; Pigment printing; Resist and discharge printing of cotton, silk and polyester; Transfer printing of polyester; Inkjet printing.
LYCRA,SPANDEX AND OTHER ELASTANE DYEING WITH DIFFERENT COLOR COMBINATIONS AND DYES AND ITS PROCESS STUDY ACCORDING TO TEMPERATURE AND PRESSURE SUITABILITY ACCORDANCE TO DYEING PARAMETERS
Fabric softener (also called fabric conditioner) is used to prevent static cling and make fabric softer i.e. Softening agents are applied to textiles to improve their hand, drape, cutting and sewing qualities.Fabric softeners work by coating the surface of the cloth fibers with a thin layer of chemicals; these chemicals have lubricant properties and are electrically conductive, thus making the fibers feel smoother and preventing buildup of static electricity
Basic knowledge about blend dyeing
Dyeing of Blended Fibres & Fabrics
Blends:
Blends are any textile material from fiber through yarn to fabric which are deliberate combination of chemically or physically different fibrous polymer. Cotton and Polyester blend is an example of chemically different blend and Cotton and Viscose is physically different blend because both are cellulosic.
Reason for blending:
1.Economy: The dilution of an expensive fibre by blending with a cheaper substitute.
2.Durability: The incorporation of a more durable component to extend the useful life of a relatively fragile fibre.
3.Physical properties: A compromise to take advantage of desirable performance charactristics contribuition by both fibre components.
4.Color: The development of new fabric design for garments incorporating multicolor effect.
5.Appearance: The attainment of attractive appearance & perceptible qualities using combinations of yarns of different lusture, crimp or denier which still differ in appearance even when dyed with same color.
6.Other reasons-
Blending develops fibre properties.
Colorant modification is possible by blending.
Finishing process modification.
Improved moisture absorption, antistatic characteristics, reduced pilling, improved abrasion resistance.
Dyeing Possibilities with Blends:
1.Union Dyeing:
• This is suitable for fabrics containing two fibres to dye them in a single uniform colour, each dye suitable for one kind of fibre in the blend.
• Union dyeing is same as cross dyeing except that instead of multi-colour effects. One solid colour is produced. The dyer accomplishes this by using two or more classes of dye, each of the same colours.
• Different fibres may require different dyes to obtain the same colour; this may be done by putting the appropriate colour dye that is specific to each type of fibre in to one dye bath.
• For eg: a fabric composed of rayon and acetate can be dyed with a solid colour green by using a direct dye for the rayon, and a disperse dye of the same colour for the acetate.
2.Resist/Reserve dyeing:
• In resist dyeing at least one (but not all) of the components of the blend remains essentially undyed i.e almost white.
3.Cross dyeing:
• Cross dyeing produces fibres of contrasting color
• This is two types-
a)Shadow effect/Tone-in-Tone dyeing:
Two fibres are dyed in same hue & brightness but the depth is different. It is called tone-in-tone or shadow effect.
b)Contrast effect:
Two fibres are dyed with strong difference in hue, brightness & depth.This is called contrast effect. Pleasing final appearance is important here.
Styles of printing; Printing thickeners including synthetic thickeners; Printing auxiliaries; Printing of cotton with reactive dyes, wool, silk, nylon with acid and metal complex dyes, Printing of polyester with disperse dyes; Pigment printing; Resist and discharge printing of cotton, silk and polyester; Transfer printing of polyester; Inkjet printing.
LYCRA,SPANDEX AND OTHER ELASTANE DYEING WITH DIFFERENT COLOR COMBINATIONS AND DYES AND ITS PROCESS STUDY ACCORDING TO TEMPERATURE AND PRESSURE SUITABILITY ACCORDANCE TO DYEING PARAMETERS
Fabric softener (also called fabric conditioner) is used to prevent static cling and make fabric softer i.e. Softening agents are applied to textiles to improve their hand, drape, cutting and sewing qualities.Fabric softeners work by coating the surface of the cloth fibers with a thin layer of chemicals; these chemicals have lubricant properties and are electrically conductive, thus making the fibers feel smoother and preventing buildup of static electricity
Importance of softener . There are different topic of softener has been added in this slide like properties, type, commercial name etc. I think it will be helpful to others people who seeking something about softener.
Softening agents are applied to textiles to improve their hand, drape, cutting and sewing qualities. An effective softener must be readily dispersible in rinse water and rapidly absorbed so that uniform deposition on the fabric can occur within a relatively short treatment time and generally, exhaustion should take place in about 5min for the softener to be effective and economically usable. It must impart softness, fluffiness and lubricity to the treated cloth and reduce static build-up, especially in the case of hydrophobic fibers like cellulose acetate, nylon, polyester and acrylic fibers. These effects should be obtained without the loss of fabric whiteness or brightness, and then the treated fabric should retain its ability to absorb in subsequent use for drying the body (bath towels) or other surfaces. Fabric softener (also called fabric conditioner) is used to prevent static cling and make fabric softer. It is available as a liquid or as dryer sheets. Popular brand names include Downy (Lenor), Snuggle, Bounce, Comfort and Sta-Soft.I believe that, the knowledge of this report will help future carrier of every textile engineer.
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3. MD.KAMRUL HASAN MD. ABDULLAH AL IBRAHIM MD. HOSSAIN
ID: BTE 01105657. ID: BTE 01105659 ID: BTE 01105667
Submitted By
4. OUTLINE OF PRESENTATION
Introduction
Mechanisms of the Softening Effect
Desirable Properties of Textile Softener
Product types and their chemistry
Types of Softeners
Anionic Softeners
Cationic Softeners
Non-ionic Softeners
Amphoteric Softeners and Silicone Softeners
Advantages and Dis-advantages
Conclusion
5. Introduction
Softener:
A softener is a chemical, when applied to textile materials; bring about softness in the
surface. Softener or softening agents have been used for many years in textile finishing
for improving softness, handle, etc.
Fig: Textile softener
6. Continue….
With chemical softeners, textiles can achieve an agreeable, soft hand (supple, pliant, sleek
and fluffy), some smoothness, more flexibility and better drape and pliability
The perceived softness of a textile is the combination of several measurable physical
phenomena such as:
elasticity,
compressibility and
smoothness.
The hand of a fabric is a subjective sensation felt by the skin when a textile fabric is touched
with the finger tips and gently compressed.
7. Mechanisms of the Softening Effect
Softeners provide their main effects on the surface of the fibres.
Small softener molecules, in addition, penetrate the fibre and provide an internal plasticization of
the fiber forming polymer by reducing of the glass transition temperature Tg.
The physical arrangement of the usual softener molecules on the fibre surface is important and
shown in Fig below.
It depends on the ionic nature of the softener molecule and the relative hydrophobicity of the fibre
surface.
Softeners orient themselves toward the fibre creating a new surface consisting of molecular chains
that provide the characteristic softening and lubricity.
8. Desirable Properties of Textile Softener
It should be easy to handle.
It should have good compatibility to other chemicals.
It should not affect the shade of the material.
It should not affect the fastness of dyed material.
It should not cause any yellowing effect on dyed and finished material.
It should be stable to high temperature.
It should be non volatile by water vapor.
It should be non toxic and non caustic.
It should be easily bio degradable.
9. Product types and their chemistry
Most softeners consist of molecules with both a hydrophobic and a hydrophilic part.
Therefore, they can be classified as surfactants (surface active agents) and are to be found
concentrated at the fiber surfaces.
Most softeners have a low water solubility.
Therefore softening products are usually sold as oil in water emulsions containing 20–30 %
solids.
The softener molecules typically contain a long alkyl group, sometimes branched, of more than
16 and up to 22 carbon atoms, but most have 18 corresponding to the stearyl residue.
Exceptions to this molecular structure are the special categories of silicones, paraffin's and
polyethylene softeners.
About one-third of the softeners used in the textile industry are silicone based.
10. Types of Softeners
Depending on charge on parent molecule
Anionic Softeners
Cationic Softeners
Non-ionic Softeners
Amphoteric Softeners Other Softeners
Other Softeners:
Silicone Softeners (Silicone Emulsions)
Polyethylene Softeners (Polyethylene Emulsions).
11. Anionic Softeners
Softeners having sulphate and sulphonate groups are the most common.
Anionic softeners are heat stable at normal textile processing temperatures and compatible
with other components of dye and bleach baths.
They can easily be washed off and provide strong antistatic effects and good rewetting
properties because their anionic groups are oriented outward and are surrounded by a thick
hydration layer.
They are often used for special applications, such as medical textiles, or in combination with
anionic fluorescent brightening agents.
12. Softening Mechanism of Anionic Softeners
Anionic softeners orient themselves with their
negatively charged ends repelled away from the
negatively charged fibre surface.
This leads to higher hydrophobicity, but less
softening than with cationic softeners.
13. Anionic Softeners
Advantages
1. Compatible with FBA's
2. Have good rewetting properties
3. Do not tender Sulphur- dyed goods
4. Used extensively on mechanically
finished fabrics mechanically finished
e.g. brushed, sheared , sanforised
Disadvantages
1. Inferior in softness performance to
catatonics, generally and sensitive to water
hardness and electrolytes in the finish bath
2. Usually higher concentrations required and
even then cationic impart softer feel
3. Limited durability to laundering and dry
cleaning
14. Cationic Softeners
Chemical nature: Quaternary ammonium compounds
Cationic softeners have the best softness and are reasonably durable to laundering.
They can be applied by exhaustion to all fibres from a high liquor to goods ratio bath and they
provide a hydrophobic surface and poor rewetting properties, because their hydrophobic
groups are oriented away from the fibre surface.
They are usually not compatible with anionic products (precipitation of insoluble adducts).
Cationic softeners attract soil, may cause yellowing upon exposure to high temperatures and
may adversely affect the light fastness of direct and reactive dyes.
15. Softening Mechanism of Cationic Softeners
Cationic softeners orient themselves with their positively
charged ends toward the partially negatively charged fibre
(zeta potential),
Creating a new surface of hydrophobic carbon chains that
provide the characteristic excellent softening and lubricity
seen with cationic softeners.
16. Cationic Softeners
Advantages
1. Soft, lofty, silky handle to most fabrics at
low levels of add-on
2. Substantive to most fibers
3. Good lubricant properties and often have
positive effect on wet fastness
4. Improve tear strength, abrasion
resistance and suability
5. Improve antistatic properties ( especially
on synthetics)
Dis-Advantages
1. Incompatible with anionic auxiliaries
including FBA's
2. Free amine causes yellowing and may
change dye shade or affect light fastness
3. May react with residual chlorine from
bleach baths
4. Adversely affect soil removal properties,
5. Can cause tendering of sulphur dyed
fabrics
17. Non-ionic Softeners Based On Paraffin And Polyethylene
Polyethylene can be modified by air oxidation in the melt at high pressure to add
hydrophilic character (mainly carboxylic acid groups).
Emulsification in the presence of alkali will provide higher quality, more stable products.
18. Softening Mechanism of Non-Ionic Softeners
The orientation of non-ionic softeners depends on the nature of the fibre surface, with the
hydrophilic portion of the softener being attracted to hydrophilic surfaces and the
hydrophobic portion being attracted to hydrophobic surfaces.
19. Non-ionic Softeners
Advantages
They show high lubricity (reduced
surface friction) that is not durable
to dry cleaning
They are stable to extreme pH
conditions and heat at normal
textile processing conditions, and
Are reasonably priced and
compatible
Dis-advantages
Handle generally poorest out of anionic, cationic
and non- ionic
Usually have negative effect on wet fastness
properties of dyes
Cannot easily be applied by exhaust.
20. Amphoteric Softeners
Surfactants containing potentially anionic and
cationic groups within the same molecule.
Typical properties are good softening effects, low
permanence to washing and high antistatic
effects (because of their strong ionic character).
Good compatibility with easy-care finishes,
Flame-retardants and hydrophilic finishes.
Expensive, poor temperature stability.
21. Continue….
Inherent ecological disadvantages of many conventional (unmodified) quaternary
ammonium compounds (quaternaries) are fish toxicity and poor biodegradability.
Quaternary ammonium compounds are easily removed from waste water by
adsorption and by precipitation with anionic compounds.
22. (a) Cationic softener and (b) Anionic softener
at fiber surface.
Non ionic softener at (c) hydro-phobic and
(d) Hydrophilic fiber
Schematic orientation of softeners on fiber surface
23. Silicone Softeners
Softener is a compound of organic polysiloxane and polymer,
which is suitable for soft finishing of natural fibers such as cotton, wool, silk, hemp and
human hair.
Silicone textile finishing auxiliaries have a wide application in textile finishing. The
auxiliary can not only deal with natural fabrics, but also deal with polyester, nylon and
other synthetic fibers.
After treatment, fabric is anti-wrinkle, anti-fouling, anti-static, anti-pilling and plump, soft,
elastic and glossy, with a smooth, cool and strong style.
Silicone softening finishing can also improve the strength of fiber and reduce abrasion.
24. Silicone Softeners features
Soluble in water, aqueous solution is very stable and in
good compatibility.
The fabric feels soft, smooth and full, and has good drape
and puffiness;
Excellent hygroscopicity and good permeability.
Moisture absorption and antistatic property.
It has good resilience and wrinkle resistance
Stable working fluid, no demulsification, no floating oil.
Not easy to get yellowing in high temperature.
25. Silicone Softeners
Advantages
1. Silky handle on all fibers
2. Improve tear strength, abrasion
resistance, and excellent for
improving sewing properties
3. Amino-functional silicones
improve durable press
performance of cotton goods.
4. Non-yellowing at moderate
temperatures.
Disadvantages
1. Create water- repellency of some type,
making them unsuitable when absorbency is
required.
2. Cannot easily be removed for re dyeing
3. Expensive
26. Conclusion
The softener is one of the most important chemical to be applied onto the fabric.
Softener makes a fabric capable of being used with comfort.
It also controls other vital characteristics of a fabric.
So, It is sure after all this information that the knowledge about the softener is very
important to complete the process of textile processing.