Reactive Dyestuffs

AVANI DYE CHEM INDUSTRIES offer a wide range of Reactive Dyes suitable for various textile uses i.e. dyeing and printing. This pattern card gives an idea regarding application technique as shades.

Preparation of Goods for Dyeing : Cotton goods before dyeing must be evenly desired, scoured and bleached (preferably mercerized) to obtain best results. Before dyeing, goods should be absolutely free from alkali. To ensure, give a treatment with dilute Acetic acid (0.5 part/liter) to prevent premature fixation of dye.

Reactive 'M' Brand Dyes : These are dyed under cold condition as they possess high substantivity / reactivity. They are generally employed by exhaust application.

Reactive 'H' brand Dyes : These are less reactive / substantive and hence are generally applied by continuous methods except Turq. Blus.

Exhaust dyeing is carried at a higher temperature i.e. ariund 80-9⁰C. They process better fastness than 'M' Brand Dyes.

Reactive Vinyl Sulphone Dyes : These are generally employed by semi continuous methods i.e. pad- batch process, although Black B, Turq. Blue G, can be economically used even under long liquor dyeing as for Knitwears.

Reactive 'HE' Brand Dyes : These are specially made for Exhaust dyeing under long liquor rations. They are less sensitive to Glauber salt concentration, time and temperature, Dyeings produced are level and fastness characteristics are better when compared to 'M' Brand reactive dyes, These are largely employed for dyeing knitwear and cellulosic component of polyester / cellulosic blended fabrics. Exhaust dying is carried out in similar way as for Hot Brands. Reactive 'HE' dyes, possessing considerably higher exhaustion and fixation of properties contribute to appeciable cost reduction. Due to higher fixation of these dyes, the drained and washed liquors after dyeing contain much less quantity of unfixed dyes thereby minimising water pollution.

Reactive 'ME' Brand Dyes : These are low temperature high exhaust dyes with higher grade of allround fastness properties including perspiration, light, chlorine and washing, These dyes have also an advantage of high degree of exhaustion and fixation rates, better alkali stability and levelling properties, As these dyes react with cellulosic fibres at low temperatures and real energy saving dyes. These dyes can be applied at low temperatures at 60 ⁰C with addition of 50 gm / I Glauber's salt and 20 gm / I soda ash.

Dyeing

REACTIVE 'ME' Dyes can be used for both Exhaust Dyeing as well as for Pad - Batch Dyeing.

Exhaust Dyeing

Two method, as described below can be used.

a) NORMAL METHOD

The fabric is introduced into the predissolved Dye solution at 25⁰C. Run for 15 minutes. Add 50 gms/I Glauber's Salt. Raise temperature to  60⁰C in 20 minutes. Add 20 gms/I Soda Ash. Dye for 60 to 65 minutes more.

b) CONSTANT TEMPERATURE METHOD :

Set the dyebath at 60⁰C. Enter the fabric and Dye for 10-15 minutes. Add Glauber's Salt 50 gms/ I and dye for 20 minutes more. Add 20 gms/I Soda Ash. dye futher for 60-65 minutes.

Dyeing Methods for 'M', 'ME', 'H' and 'HE' Dyes

1 Exhaust Methods : Dyebath is set at 30-35 ⁰C with Glauber's salt or common salt. Enter the  goods, run for 10 minutes. Add the dissolved Alkali and raise the temperature (30-40⁰C for Cold Brands. 80-90⁰C for Hot Brands) Finally goods are washed off.

SALT & ALKALI REQUIREMENT

2 Pad Batch Process : Material is padded in dyestuff solution containing alkali and wetting agent and if necessary Glabour's salt and batch shode be well covered with polythene paper to avoid drying.

Dyeing Method for Vinyl Sulphone Dye :

Exhaust Dyeing : Dyeing is generally carried out with 15 gms/liter Trisodium phosphate as alkali. the temperature raised to 60-80⁰C and alkali added. Dyeing further continued for 1 hour and goods rinsed and soaped.

Pad-batch Method Recipe for padding solution :

The padded goods are batched for 24 hours and soaped.

Pattern Illustration : The Patterns illustrated are dyed by exhaust dyeing method on mercerised cotton for 'M', 'ME', and 'HE' Brand Reactive dyes and by pad batch method for 'H'  Brand Reactive dyes and Vinyl Sulphone Dyes.

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