PROCESSING FOR G&S PROCION 'H' DYES
Fixation by Steaming
Steam is necessary
for fixation of G & S Procion 'H' Dye. Dry heat will not work
for the Procion "H" dye, nor will a steam iron. The
dyes require an enclosed volume of steam to induce the chemical
reaction necessary to bond the dye to the fibre. Steaming treatments
are carried out at 100 degrees Celsius (212oF).
In the steam environment, the printed or dyed areas absorb moisture
and form a concentrated dye bath from which the dying of the fibre
takes place. The function of the resist or thickener is to localize
the dye, both in production aspects and here in the fixation.
It prevents bleeding. The steam should be free to move around
and in abundant supply. When the steam is too moist there is a
possibility of bleeding. Too long a steaming will also result
in colour transferring through the newsprint. If the steam is
too dry, the lack of moisture retards the dyes from setting properly.
Slight air-contamination is not dangerous, however, a rush of
cold air may create condensation which drips on the fabric.
A) Roll up the painted silk for steaming in unprinted newsprint.
Double up paper for dark colours.
B) After rolling, seal with tape.
C) Then fold and tie package.
D) Now complete as shown.
Washout after steaming is necessary to remove any excess dye which
has not chemically bonded. This does not deplete the colour intensity
that was first applied, it is simply excess, and the first wash-out
is very important.
Wash the steamed fabric in a container with continuous running
cold water. Continually flush with fresh water until the fabric
is rinsing clear. Bring the water temperature up to warm, add
TNA Soap and wash by hand or in a
washing machine. Run through a full cycle to complete the crucial
after-wash. If the silk fabric contains a fair amount of light
areas, use the TNA Soap during the complete rinsing stage. This
protects the fabric from loose particles of dyes.
Use a capful of white vinegar in the final rinse to condition
the silk and to aid in ironing. Silk is best ironed wet with a
G&S Dye - Steaming