Thermochromic Liquid Crystal Reversible Temperature Indicating Strips
The Thermochromic Liquid Crystal (TLC) range of reversible temperature indicating labels forms a fast, easy to interpret indication of actual temperature. They are also convenient, easy to use and in-expensive.
What They Are:
These self adhesive labels consist of a series of temperature-sensitive elements containing microencapsulated TLC coated on a black backing. Each element changes colour distinctly as its rated temperature is reached, passing through the colours of the spectrum in sequence (Orange, Yellow, Green, and Blue before turning black at a higher temperature. The TLC strips are calibrated so that the indicator that shows green indicates the actual temperature. The colour changes are reversible and the reflected colours will be observed in the reverse order upon cooling.
How the labels work:
The temperature-sensitive elements contain TLC molecules that are very sensitive to temperature and change position / twist in relation to changes in temperature. This change in molecular structure affects the wavelengths of light that are absorbed and reflected by the liquid crystals, resulting in an apparent change in the colour of each temperature event.
When the rated temperature of an indicator is reached the TLC molecules twist slightly causing the TLC substance to absorb the red and blue portions of the visible light and reflect the green part. This causes the temperature event to appear green. When the temperature decreases, the molecules begin to twist in the opposite direction, and the TLC reflect a different portion of the spectrum.
|Polyester Film||>75μ, 125μ, 175μ|
|Liquid Crystal Ink||10-50μ|
|Adhesive & Carrier||150-180μ|
- Tim Arrowsmith