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Left: individual linear polymer chains Right: Polymer chains which have been cross linked to give a rigid 3D thermoset polymer. In materials science, a thermosetting polymer, often called a thermoset, is a polymer that is obtained by irreversibly hardening ("curing") a soft solid or viscous liquid prepolymer (). [1]
Thermochromic ink (also called thermochromatic ink) is a type of dye that changes color in response to a change in temperature. [ 1 ] [ 2 ] [ 3 ] It was first used in the 1970s in novelty toys like mood rings, but has found some practical uses in things such as thermometers, product packaging, and pens. [ 4 ]
Thermal-transfer printing is done by melting wax within the print heads of a specialized printer. The thermal-transfer print process utilises three main components: a non-movable print head, a carbon ribbon (the ink) and a substrate to be printed, which would typically be paper, synthetics, card or textile materials.
Example of a thermochromic T-shirt. A hairdryer was used to change the blue to turquoise. Another example of a thermochromic T-shirt. Thermochromic dyes are based on mixtures of leuco dyes with other suitable chemicals, displaying a color change (usually between the colorless leuco form and the colored form) that depends upon temperature.
The first U.S. patent for pharmaceutical inks was filed on 28 June 1966, and its method involved ethyl alcohol, shellac, titanium dioxide and propylene glycol.. Most pharmaceutical inks since the early 1990s eliminate ethyl alcohol in favour of faster ink drying times, and may include methyl alcohol and isopropanol in addition to the traditional ingredients titanium dioxide and propylene glycol.
Thinner traps are less visible. Therefore, the trap width is set to a strict minimum, dictated by the maximum amount of misregistration of the entire workflow up to the press. When printing at 150 lpi, traps are usually between 1/150 and 1/300 inch (0.48 pt and 0.24 pt, 0.16 mm and 0.08 mm). These values are usually multiplied by 1.5 or 2 when ...
A thermal printer Bills and receipts are typically printed on thermal paper. [1]Thermal printing (or direct thermal printing) is a digital printing process which produces a printed image by passing paper with a thermochromic coating, commonly known as thermal paper, over a print head consisting of tiny electrically heated elements.
Traditionally, the advantage of dye-sublimation printing has been the fact that it is a continuous-tone technology, where each dot can be any color. In contrast, inkjet printers can vary the location and size of ink droplets, a process called dithering, but each drop of ink is limited to the colors of the inks installed. Consequently, a dye ...