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Monday, 16 September 2013

Softening Process


                                   


SOFTENING PROCESS


Softening process of Denim is very critical. As denim is very heavy in compare with other fabrics hence its needs softening. During this process there is a big problem -the discoloration of denim i.e change in shade or loss of whiteness, giving a yellow tint is commonly known as yellowing. By using normal softener will lead to ozone problem. Indigo dyed fabric are even more prone to yellowing.

As it’s a widespread problem & there in no single reason for its cause. Instead a number of condition can singly or in combination lead to the problem. Yellowing in not specific to certain fibers, finishes or washing processes. It is not specific to chemicals or chemical treatment but certainly some of the factors among these can lead to the yellowing. As cotton & all organic polymers develop yellowing in time.

Light , acids, impurities, detergents & chemical contribute to yellowing problems.

Temperature of drying & curing can impart yellowing due to scorching of the cotton. Therefore good control must be used to minimize this type of damage.
Hence its advisable to use Antiozonate softener which prolong ozone reaction of Indigo & keep garment in good condition.



MINIMISATION OF YELLOWING RISK:
Its Impossible to eliminate yellowing but it is possible to prolong & reduce the conditions which causes classical yellowing:
· Ensure bleaching neutralization & rinsing is proper
· Minimize back staining
· Avoid use of chemicals which cause yellowing
· Avoid leaving garment in open air for longer time
· Control drying & curing temperatures
· Using right Antiozonate softener with right pH








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