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ChemicalFinishing• In chemical finishing, water is used as the medium for applying the Chemicals.• Heat is used to drive off the water and to activate the chemicals.• Resin treatment• Softener treatment• Powder Coating• Soil/Stain Resist• Fire/Flame retarding• Special Purpose• email@example.com
RESINFINISHING• Cotton is mainly selected for apparel purpose because of its durability, ability to withstand the rough laundering treatments especially under alkaline conditions, good perspiration absorption characteristics, and comfort during wear and ability to take up a wide range of dyestuffs.• However, proneness to creasing under slight crushing and retention of the crease for along time give cotton garments a poor rating during actual wear.• The ability of a fabric to resist the formation of crease or wrinkle when slightly squeezed is termed as crease resistance.• The ability of a fabric to recover to a definite degree is called crease recovery of the fabric.
• Obviously Resin Finishing is the process of bringing out a special property of „ crease recovery ‟ to Cotton.• Resin finishing often known by various fancy terminology is an important process of textile processing.Resin finishing quite often called• “ Wash & wear finish”• “ Anti crease finish”• “ Crease resistant finish”• “ Durable press finish” And• “ wrinkle free finish” is gaining importance firstname.lastname@example.org
• Contd…• Resins are cross linking agents, which form covalent bond on reaction with OH groups of cellulosic materials in acidic medium at a pH of 3-4.
RESINS MAINLY FALL INTO TWO GROUPS• Deposition type of resins Cross linking type of resinsDeposition type of resins• This type of resins is deposited on the fabric as surface coating. No reaction will take place between the fiber and resin.They include• Phenol-Formaldehyde resins• Urea formaldehyde resin• Alkyd resins• Ketone resins• Vinyl resins
Cross Linking Type Of Resins• These types of resins chemically react with the fiber and crosslink the fiber molecules.• The type of finish obtained is durable and much better than deposition type.• They are also known as N–Methylol compounds as the Methylol groups (-CH2OH) are attached to the nitrogen. The cross linking compounds are commonly called resins, but the term pre condensate is correct. The pre condensates further polymerize to form resins.• Thefollowingaresomeofthecrosslikingagentsmostlyusedforcreaseresistantfinishing.• DMU (Di methylol Urea)• DMEU(Di methylol Ethylene Urea)• DMDHEU(Di methylol Di hydroxy Ethylene Urea)• DMPU(Di methylol Propylene Urea)• TMM(Tri methylol melamine/Melamine formaldehyde
Objective• ThemainobjectiveofresinfinishKeepthefabricflatandsmoothandFreefromundesirabl ecreasesAdvantages• It improves the Crease Resistance and Crease Recovery property• It reduces the shrinkage of the fabric during laundering• It imparts a smooth and quick drying property• It improves Resilience, Handle and Draping quality• It improves the weight and Dimensional stability• It increases the strength of RAYON Sin both wet and dry state• It gives resistance to degradation by light and laundering• It improves the fastness to Light and Washing of many dyestuffs• It prevents the Inter molecular slippage in the fiber core• It becomes partially water proof and Rot proof
Disadvantages• It decreases the Tensile strength and Tear strength• It decreases the Abrasion resistance• It gives an unpleasant odor• It gives unwanted Harsh and Stiff feel• It turns the fabric yellow after chlorine bleaching
RESIN CONCENTRATIONAs the concentration of resin increases in thepad bath the CRA of the resultant productincreases. Dry Crease Recover y (w+d) Degress Reagent Concentration (Mole x 10/ 100G Fabric)