Thermochromic inks change from the colourless to colourful or vice versa with the changes in temperature. These inks make use of thermochromism, which refers to “materials that change their hues in response to temperature fluctuations”. These inks are also know as leucodyes, which are organic (carbon-based) chemicals that change in molecular structure due to heat energy. The varied interactions with light result in different colours seen by the eye.
Clear base (like resin, glue, polymorph, etc)
Light coloured fabric
Mix the pigment in paint, resin, glue, Polymorph, etc to create the ink
Spread the ink unto a silkscreen
Apply unto a light coloured fabric
Allow to air-dry
The print turns colourless when exposed to temperature around 22 degree celsius
However, if over heated to above 200 degree celsius, irreversible damage to the dye might occur
Also, note that mixing the pigment in non-clear bases mightnot produce the same results
Products naturally exposed to the human heat, creating interaction in the mundane.
An example is the masks designed by Marjan Kooroshnia, a Swedish textile-design student
Chemistry really plays a big role in this application! New technologies and inventions bring about a wave of uses and solutions to problems.
It also takes some experimentation in the application of these pigments and dyes. When the light yellow thermochromic dye was mixed with blue acrylic paint, the resulting print could not change in colour.
Through the presentation, we learnt about the differences between two types of surface printing:
Long set-up time
Fast, digitally printed
Every colour matters (multiple stencils)
Minimum quantity required
No minimum quantity
Repeat prints are cheap and fast
Consistent repeat prints, accurate
We were also lectured on laser transfer printing and witnessed first hand the demonstration on two T-shirts, one on a white piece and the second on a blue piece. They required different transfer papers by TheMagicTouch and the processes varied accordingly.
Steps for the white shirt transfer included:
laser printing the design onto the paper
cutting out the design close to the borders
placing the design faced down on the shirt
applying the heat-press
quickly removing the transfer paper from the shirt
laying a baking paper over the transferred design and applying the heat-press once again
Other applications of transfer printing also include the incorporation of circuit boards unto fabric as well as deriving a circuit by etching away a metal surface.