Auxiliaries are chemicals added to printing paste that facilitate effective and quality printing. There are different types of auxiliaries classified by function and use, including thickeners and wetting agents. Thickeners like starch and gums are used to adjust paste viscosity and compatibility. Wetting agents help dissolve dye powders to prevent lump formation and ensure even dye distribution. Common auxiliaries also include solvents to improve dye solubility and penetration, and anti-foaming agents to prevent foam generation during printing. The selection of auxiliaries depends on the printing method, dye class, fabric, and compatibility with other paste ingredients.
Studies on textile printing on cotton fabric with Various ThickenerVijay Prakash
Printing is a process for reproducing text and images using a master form or template. The earliest examples include Cylinder seals and other objects such as the Cyrus Cylinder and the Cylinders of Nabonidus. The earliest known form of woodblock printing came from China dating to before 220 A.D. Later developments in printing include the movable type, first developed by Bi Sheng in China. The printing press, a more efficient printing process for western languages with their more limited alphabets, was developed by Johannes Gutenberg in the fifteenth century.
Modern printing is done typically with ink on paper using a printing press. It is also frequently done on metals, plastics, cloth and composite materials. On paper it is often carried out as a large-scale industrial process and is an essential part of publishing and transaction printing.
Printing spread early to Korea and Japan, which also used Chinese logograms, but the technique was also used in Turpan and Vietnam using a number of other scripts. This technique then spread to Persia and Russia. This technique was transmitted to Europe from China, via the Islamic world, and by around 1400 was being used on paper for old master prints and playing cards. However, Arabs never used this to print the Quran because of the limit of Islam doctrine.
The Paints and Coatings Industry is one of the most heavily regulated industries in the world. The sector consists of manufacturers of paints, varnishes, lacquers, shellacs, stains, and a variety of other specialty coatings.
Studies on textile printing on cotton fabric with Various ThickenerVijay Prakash
Printing is a process for reproducing text and images using a master form or template. The earliest examples include Cylinder seals and other objects such as the Cyrus Cylinder and the Cylinders of Nabonidus. The earliest known form of woodblock printing came from China dating to before 220 A.D. Later developments in printing include the movable type, first developed by Bi Sheng in China. The printing press, a more efficient printing process for western languages with their more limited alphabets, was developed by Johannes Gutenberg in the fifteenth century.
Modern printing is done typically with ink on paper using a printing press. It is also frequently done on metals, plastics, cloth and composite materials. On paper it is often carried out as a large-scale industrial process and is an essential part of publishing and transaction printing.
Printing spread early to Korea and Japan, which also used Chinese logograms, but the technique was also used in Turpan and Vietnam using a number of other scripts. This technique then spread to Persia and Russia. This technique was transmitted to Europe from China, via the Islamic world, and by around 1400 was being used on paper for old master prints and playing cards. However, Arabs never used this to print the Quran because of the limit of Islam doctrine.
The Paints and Coatings Industry is one of the most heavily regulated industries in the world. The sector consists of manufacturers of paints, varnishes, lacquers, shellacs, stains, and a variety of other specialty coatings.
Paint is any pigmented liquid, liquifiable, or mastic composition that, after application to a substrate in a thin layer, converts to a solid film. it is most commonly used to protect, color, or provide texture to objects.
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.
THIS PRESENTATION IS TO GIVE AN INFO ABOUT LIPSTICKS .... IT WAS CATEGORISED AS A COSMETIC PRODUCT FOR 3RD BPHARM STUDENTS IN THE 5TH SEMESTER. THIS PRESENTATION WILL HELP THEM AS A FASTRACK REFERENCE FOR EXAMS AND ALSO FOR COMPETITIVE EXAMINATIONS..
Different types of auxiliaries and ingredients used in textilesorachemical
There is a huge different when you use Auxiliaries and Ingredients chemical in textiles chemical industry.
If you are looking for best textiles chemical manufacturer Companies in India then ORA CHEM is one of the best textile chemicals suppliers and textile auxiliary chemical suppliers in Gujarat as well as other parts of India. Contact us at:9979533344 or visit this website: https://orachemicals.in/different-auxiliaries-ingredients-used-textiles/
বাংলাদেশের অর্থনৈতিক সমীক্ষা ২০২৪ [Bangladesh Economic Review 2024 Bangla.pdf] কম্পিউটার , ট্যাব ও স্মার্ট ফোন ভার্সন সহ সম্পূর্ণ বাংলা ই-বুক বা pdf বই " সুচিপত্র ...বুকমার্ক মেনু 🔖 ও হাইপার লিংক মেনু 📝👆 যুক্ত ..
আমাদের সবার জন্য খুব খুব গুরুত্বপূর্ণ একটি বই ..বিসিএস, ব্যাংক, ইউনিভার্সিটি ভর্তি ও যে কোন প্রতিযোগিতা মূলক পরীক্ষার জন্য এর খুব ইম্পরট্যান্ট একটি বিষয় ...তাছাড়া বাংলাদেশের সাম্প্রতিক যে কোন ডাটা বা তথ্য এই বইতে পাবেন ...
তাই একজন নাগরিক হিসাবে এই তথ্য গুলো আপনার জানা প্রয়োজন ...।
বিসিএস ও ব্যাংক এর লিখিত পরীক্ষা ...+এছাড়া মাধ্যমিক ও উচ্চমাধ্যমিকের স্টুডেন্টদের জন্য অনেক কাজে আসবে ...
Paint is any pigmented liquid, liquifiable, or mastic composition that, after application to a substrate in a thin layer, converts to a solid film. it is most commonly used to protect, color, or provide texture to objects.
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.
THIS PRESENTATION IS TO GIVE AN INFO ABOUT LIPSTICKS .... IT WAS CATEGORISED AS A COSMETIC PRODUCT FOR 3RD BPHARM STUDENTS IN THE 5TH SEMESTER. THIS PRESENTATION WILL HELP THEM AS A FASTRACK REFERENCE FOR EXAMS AND ALSO FOR COMPETITIVE EXAMINATIONS..
Different types of auxiliaries and ingredients used in textilesorachemical
There is a huge different when you use Auxiliaries and Ingredients chemical in textiles chemical industry.
If you are looking for best textiles chemical manufacturer Companies in India then ORA CHEM is one of the best textile chemicals suppliers and textile auxiliary chemical suppliers in Gujarat as well as other parts of India. Contact us at:9979533344 or visit this website: https://orachemicals.in/different-auxiliaries-ingredients-used-textiles/
বাংলাদেশের অর্থনৈতিক সমীক্ষা ২০২৪ [Bangladesh Economic Review 2024 Bangla.pdf] কম্পিউটার , ট্যাব ও স্মার্ট ফোন ভার্সন সহ সম্পূর্ণ বাংলা ই-বুক বা pdf বই " সুচিপত্র ...বুকমার্ক মেনু 🔖 ও হাইপার লিংক মেনু 📝👆 যুক্ত ..
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1. Auxiliaries
What are printing Auxiliaries?
• The chemicals added to printing paste that facilitate production of effective and quality are called printing auxiliaries.
• There are different printing auxiliaries. They are classified according to their function and various uses.
• These auxiliaries selected based on the method of printing, dye class, fabric to be printed and compactivity with other
ingredient in the paste.
•
1. Thickeners
2. Wetting agent
Thickener
• A large number of thickeners are available for printing.
• The choice of thickener will depend upon the class of dye to be printed and style of printing.
• The compatibility of thickener with other ingredients in the printing paste should also be considered during its
selection.
• Carbohydrates form the most important and largely used varieties of thickening agents.
• Wheat starch and maize starch have been used as thickeners in printing for a very long time.
• Starch is not suitable as a thickener in the preparation of paste in which acids are to be added.
(A) Natural Thickener:
(I) Starch:
• It is a vegetable substance manufactured from cereals and tubes such as rice, wheat, maize, potato etc.
• It is insoluble in cold water.
• Starch has the property of swelling when heated with water to give a viscous paste.
(II) Plant exudates (Gum):
(a)Gum Senegal or Gum Arabic:
• It is obtained from the exudation of Acasia plant.
• 30 – 50 % of gum paste is required for printing.
• It is stable under both strongly alkaline and strongly acidic conditions.
• Gum arabic and gum Senegal are both traditional thickenings, but expense prevents them from being used for any but
pale, delicate tints.
(b)Gum Tragacanth or Gum Dragon:
• It is obtained from the ligneous plant.
• The advantage of this gum is that it leaves the cloth quite soft.
• Generally 4 – 5 % gum paste is used in printing.
• It is stable under mildly alkaline conditions but not under strongly alkaline conditions.
• When added to a starch paste it increases its penetrative power and adds to its softness without diminishing its
thickness, making it easier to wash out of the fabric.
• Used by itself it is suitable for printing all kinds of dark grounds on goods that are required to retain their soft
"clothe" feel.
(c) Gum Karaya:
• This gum is obtained from the Karaya tree.
• It is not much used at present.
(III) Roots and seeds:
(a) Guar Gum:-
• Guar gum is obtained from the endosperm of the guar plant seed. It gives high viscosity pastes.
• It forms viscous colloidal solution when hydrated in cold water.
• Its derivatives are used in printing synthetic fabric.
(b)Locust Bean Gum:
• It is obtained from the hard seeds of the locust bean of carob tree.
• Only 2 – 3 % of this gum gives print paste of required viscosity. It is neutral and soluble in water.
(c)Tragasol Gum:-
• It is a special product of locust bean.
• It has better stability to mild alkalis and acids than locust bean gum.
(IV)Sea weeds:-
(a)Sodium Alginate:
• It is sodium salt of alginic acid which is found in sea weeds.
• Small amount of sodium alginate is required in printing paste.
• It solubilise in cold as well as in hot water, so absorption of dye by fiber is excellent.
(B)Modified natural thickeners:-
(I)Starch derivatives:
(a)Dextrin or British Gum:-
• Dextrin or dark British gum is a degradation product of starch obtained by heating it with mineral acid or roasting at
160°C till it becomes completely soluble in water.
• Generally 20 – 50 parts of dextrin per 100 parts of printing paste is used.
(b)Cellulose Derivatives:-
(b-I) Methyl Cellulose:-
• Methyl ether of cellulose is prepared from wood pulp or cotton linters.
• The ether is insoluble in boiling water and also in presence of alkali but soluble in cold water.
• It retains its consistency satisfactorily during storage.
(b-II)Sodium Carboxy Methyl Cellulose (CMC):
• It is prepared by reacting alkali cellulose with monochloro acetic acid.
• This thickener is stable to alkali and hence can be used for printing vat colours
• The removal of CMC from the cloth after printing is very easy.
(b-III)Gum derivatives:-
• Indica meyprogam is a modified guar gum which is resistant to acids and alkalises.
(C) Synthetic thickener:-
• Synthetic thickening agents are molecular substances generally co-polymers of unsaturated organic acids such as
acrylic and malefic anhydride.
• They have the following properties:-
• High degree of purity
• Rapid preparation of stock thickening
• Simple printing recipe
• Good running properties
• Optimum depth of shade
• Brilliance of the prints, excellent stability
• Synthetic thickeners have the ability to produce prints with better smoothness, levelness and sharpness as compared
to natural and modified thickeners and are suitable for photographic and multicolour prints.
(D) Emulsion Thickener:-
• Emulsion thickening derives its viscosity from a dispersion of tiny droplets of one liquid in another with a dispersing
agent.
• The two liquids must not mix or be soluble. With development of pigments color emulsion came into existence.
• Emulsions are available in disperse phase and dispersing medium.
• For printing textile material, oil in water type of emulsion is populaly used.
• Widely accepted is kerosene based emulsion.
• Choice of a thickener will depend upon the class of dye to be printed and style of printing.
• Ex: British gum and starch tragacanth thickener for direct dye.
• British gum for vat,
• Sodium alginate for disperse,
• Synthetic for reactive.
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Wetting agent
What is wetting?
• Substances that make solid materials more susceptible to water immersion.
• By reducing its surface tension or interfacial tension, so that the water can be expanded on the surface of solid
materials, or penetrate the surface, and the solid material wetting
• The use of wetting agent is generally beneficial in dissolving dyestuff eg. Turkey red oil (T.R.O.), caster oil, olive oil,
animal oil, glycerine etc.
• During the penetration of printing paste the dyestuff which is usually in the powder form is dissolve in a small
amount of water.
• In case of direct, acid, basic & reactive dyes, which are water soluble, lump formation can take place if water is
poured over the dye powder or if the dye powder is added to water.
• The correct procedure is to add a little amount of water to the dye powder & to make a paste by proper stirring.
• When all the dye is pasted, further quantity of water is added & heated to the required temperature and stirred till
complete solution is obtain.
• If the pasting is not proper prior to addition of water, small lumps of the dye powder remain undissolved & during
printing, these small lumps get deposited on the fabric & produce dark spots.
• Therefore it is necessarily used a suitable wetting agent while dissolving the dye.
• The wetting agent reduces the surface tension of water & facilitates the wetting of dye particles & ultimately results
in solubilising of the dye by chemical reaction.
• Wetting agent is used to obtain a smooth paste of the dyestuff without formation of any lumps.
• It is used to dissolve the dye powder. It is not required in case of water soluble dyes.
(I)Solvents/ dispersing agents:
Function:-
• To get bright designs
• To assist dye penetration as well as dye fixation
• To spread dye molecules evenly in the paste.
• To prevent aggregation of dye molecules in the highly concentrated of the dye.
• To prevent precipitation
• To increase solubility of the dyes
• To make proper printing shade
• In printing paste only a limited amount of water has to be used, in which dyes reach saturation
• Commonly used solvents include Acetone, alcohol, glycerine, urea etc..
• These are used as additives to printing paste to produce better prints & high colour value.
• It is useful in printing vat & azoic for increasing solubility of dyes, so that deeper & better penetrated shade can be
obtain.
• Glycine – A (BASF), Glycine – B (ICI) (thiodiethylene glycol) are excellent solvents for basic, direct, acid &
disperse dyes.
Deforming agents (Anti- foaming agents)
• To prevent the foam generation during printing
• In roller printing; one colour may be blue & other may be red, the foam of one colour may fall on the other,
sometimes mixing of colours may occur.
• The foam formed in the colour box produce faulty prints & to avoid this fault defoamer should be incorporated in the
printing paste.
• example:- Silicone, Sulphated oil, Perminol KB, Emulsified pine oil, Turpentine, Emulsifiable hydrocarbons
• Silicone defoamer readily emulsifiable hydrocarbon, sulphated oils, etc. may be used for this purpose.
• Perminal KB (ICI) is neutral yellowish brown liquid containing an aqueous emulsion of sulphated sperm oil & pine
oil.
• Emulsified pine oil is readily miscible with water & can be used as defoamer.
• Triactyl phosphate is also a very good defoaming agent.