textile wet processing 6 (dyeing of textile material 2 Welcome to your textile wet processing 6 (dyeing of textile material 2 1. ------------------ dyes exhibit all round excellient fastness properties direct vat sulpher reactive 2. vat dyes are insoluble in water but soluble in sodium hydroxide sodium chloride sodium silicate sodium carbonate 3. why salts are used in dye bath? for exhaust of dye bath to achieve level dyeing to control PH to achieve good fastness properties 4.during vat dyeing process ---is added for better exhaustion and better dye affinity sodium chloride sodium hydroxide sodium silicate sodium hypochloride 5. which dyes is required for polyster dyeing? direct disperse vat sulphur 6. dyeing of polyster fiber with disperse dyes are carried out at---------- room temperature 60 c boiling temp 130-135 0c 7. in polyster dyeing the dye bath is set with ammonium sulphate and formic acetic acid to maintain ph at 4-4.5 keep the dye stuff in dispersed condition exhaust the dye bath reduce the dye stuff into soluble from 8.disperse dyes cn be applied on--------------- wool fiber polyster fiber cotton and other cellulosic fiber silk fiber 9.HTHP dyeing machine is used for ----- dyeing cotton silk polyster wool 10.acid dyes are attached on the substate with vander walls forces eelectrostic force of attraction covalent bond trivalent bond 11. vinyl sulhone reactive dyes are applied on cotton under-------- alkaline ph acidic ph neutral ph both alkaline and 12. acid dyes cannot be used for dyeing wool polyster nylon silk 13. after degumming process the weight of silk------ decrease increase remain same increase more 14. what is true for LEUCO dye? direct dye vat dye acid dye reractive dye 15. in which of the following vatting process is involved? basic dyeing reactive dyeing vat dyeing acid dyeing Time's up
