Durable press finish

Durable Press Finish

Praveen D Nagarajan

WASH & WEAR AND DURABLE PRESS FINISH:

• Wash & Wear and durable press (permanent press) finishes are also given using resin precondensates.

• Wash & Wear finish (Wash – Dry – Wear and no need for Ironing) imparts crease recovery only and suitable where pressed in creases are not required.

• This kind of finish is not suitable where pressed in creases are required or where formation of sharp creases are hindered during ironing.

• Inserted creases on this fabric disappear quickly during wear. For sharp retention of pressed in creases and freedom from ironing the fabrics, the garments require durable press finish.

DURABLE PRESS FINISHING:

This type of finish is generally used in garments making. DMDHEU is the resin which is used for this finishing. These finishes are achieved by similar techniques as crease recovery finishes.

The sequence of process of durable press finish

• The cross linking agents are first applied by padding.

• After padding, the fabric are made into garments or some desired form.

• Then the Curing treatment is given to the fabric at a high temperature in the form of garments.

• This finishing is called as Durable Press finishing.

DURABLE PRESS FINISHING:High concentration of resin and curing at high temperature for a longer time are required for this kind of finish. This is a further development of Wash and Wear finish.

Urea Formaldehyde and Melamine formaldehyde resins are not suitable for durable press finish because these precondensates cures rapidly and it is difficult to keep them in an uncured state for a long time.

DMEU or Ethyl Carbomates may also be used for durable press finish.

DURABLE PRESS FINISHING:• The resin suitable for this process should remain intact within

the fabric till the garment is cured and should not become yellow in color.

• The resin should be fast to washing and should not affect the Light fastness of certain dyes.

• The main disadvantage of this finish is loss in strength and Reduction in Abrasion resistance, because of the combination of high resin content, and prolonged curing at high temperature.

• Ionic and Non-ionic softeners are therefore added to the resin finishing bath to minimize the loss in strength and abrasion resistance.

• Emulsion of polyethylene, polyvinyl chloride, silicones etc; are also added.


PROCESS SEQUENCE:

• Pad-Dry-Cut and make garments – Insert creases or Pleats by hot pressing – Cure – Wash – Hot rinse – Cold rinse – Dry.

(OR)• Make garments – treat with resin – hydro extract –

Press and form creases, Pleats with hot iron – Dry – Cure - Wash – Hot rinse – Cold rinse – Dry.


RECIPE FOR DURABLE PRESS FINISH:

• DMDHEU - 200gpl• MgCl2 6H2O - 20gpl• PE emulsion - 25gpl• Acrylic emulsion - 30gpl• Non-ionic wetting - 3gpl

Agent


POLYSET PROCESS ( WET FIXATION PROCESS ):

The blended fabrics are better crease resistant than 100% cellulosic fabrics. Still ironing is necessary after washing to wear in case of blends. So, durable press finish is also given for blends but following a different process sequence.


PROCESS SEQUENCE:Resin solution and additives ( without catalyst ) – batch at 70 C for 2 hours – Wash - Dry – Pad with catalyst – Dry – Stitch garment – hot press to shape and form creases and pleats – Cure at 160 C for 10 to 15 min – Wash _ Hot rinse – Cold rinse – Dry.


PARAMETERS:• 1. Time of heat setting, • 2. Temperature of heat setting • 3. Over feeding,• 4. Tension of the fabric.

Tension during heat setting is also an important factor it will disturb Diffusion and Fixation process.

Education

Durable press finish