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</html>";s:4:"text";s:6717:"Thermochromic Leuco Dye. It is much... a weave in which the warp yarns are arranged in pairs with one twisted around the other between picks of feeling yarn as in marquisette. Zinc salts of substituted salicylic acids, such as zinc di-tert-butylsalicylate have also been commercially used as developers . For other types of chairs,... Crepe effect appears in direction of the warp and achieved by alternate S and Z, or slack, tension, or different degrees of twist. While an open heat source, such as a flame, can discolor the paper, a fingernail swiped quickly across the paper will also generate enough heat from friction to produce a mark. The reactant acid in thermal paper is often bisphenol A (BPA). These two materials melt at approximately 100°C, which is a practical lower limit for thermal coloration. Leuco dyes which have the property of changing from a color state to a clear state when a stimulus is applied, and then returning to a colored state when the stimulus is removed are called reversible Leuco dyes. When the matrix is heated above its melting point, the dye reacts with the acid, shifts to its colored form, and the changed form is then conserved in a metastable state when the matrix solidifies back quickly enough. The earliest direct thermal papers were developed by NCR Corporation (using dye chemistry) and 3M (using metallic salts). 0000006653 00000 n
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Red or magenta color can be achieved with dyes such as Yamamoto Red 40. The Silent 700 was the first thermal print system that printed on thermal paper. 0000005693 00000 n
It takes about a 5ºF (3ºC) temperature change for the LD to change color. [12], Adding machine, cash register and credit card terminal paper, CS1 maint: multiple names: authors list (, Learn how and when to remove this template message, "How Ink-free Mobile Photo Printers Work", "BPA Cash Register Roll Ban Enforced In Suffolk County", "Bisphenol S Disrupts Estradiol-Induced Nongenomic Signaling in a Rat Pituitary Cell Line: Effects on Cell Functions", Texas Instruments-Computers & Software and Industrial Controls, Silent 700 Electronic Data Terminals, 1976, https://en.wikipedia.org/w/index.php?title=Thermal_paper&oldid=968263069, Articles needing additional references from January 2015, All articles needing additional references, Creative Commons Attribution-ShareAlike License, reduce fading of the thermal image caused by exposure to, reduce or eliminate residue from the thermal coating on the thermal print heads, provide better anchorage of flexographic printing inks applied to the thermal paper. trailer
Therefore, the New York Suffolk County signed a resolution to ban BPA in thermal receipt papers. Other suitable acidic materials are sulfonyl ureas such as BTUM and Pergafast 201. [9][10] This material can contaminate recycled paper. 0
Exposure to a person who repeatedly touches thermal printer paper for about ten hours per day, such as at a cash register, could reach 71 micrograms per day, which is 42 times less than the present tolerable daily intake (TDI). These dyes have a colorless leuco form when crystalline or when in a pH neutral environment, but become colored when dissolved in a melt and exposed to an acidic environment. Thermochromic Leuco Dyes. Activation temperature points range from low refrigeration type temperatures through normal body temperatures to high temperatures that exceed … To optimize the colorization temperature and to facilitate mixing, a third chemical called a sensitizer is commonly added to the imaging layer. People who often are in contact with BPA coated receipts do have a higher level of BPA in their bodies than people with average contact. The term Leuco, meaning white and was applied to the reduced form of vat dyes. The most common reducing agent is sodium dithionite (Na 2 S 2 O 4), which converts the dye to its "leuco" form that is soluble. LD are reversible, meaning they change color back and forth as the temperature fluctuates. Leuco dyes develop color when the lactone ring in the molecule reacts with an acid to open the ring, and when the lactone ring in the open state contacts a base, the ring closes and the color disappears. The Thermal Paper Industry Was Hit Hard Due to its Heavy Reliance on Leuco Dye. These low-cost ethers are excellent low viscosity solvents for leuco dyes and developers, and this facilitates color formation at a well-defined temperature and with minimum energy input. [7], The yellow layer is the topmost one, sensitive to short heat pulses of high temperature. Used commonly in a plethora of applications – from barcoding to ATM and retail receipts to parking violations and citations, casino and gaming facility printing and even shipping labels and airline tickets – thermal … Leuco dyes used in thermal paper undergo a structural change when protonated in the presence of heat and a proton donor (i.e., developer). However, the thermal threshold of the coated layer containing the colorizing components is determined by the lowest melting component of the layer. This allows inkless printing for receipts from cash registers. The stimuli for the color change depends on … It is used in thermal printers, particularly in inexpensive or lightweight devices such as adding machines, cash registers, and credit card terminals. This page was last edited on 18 July 2020, at 08:18. In the 1970s and early 1980s, Japanese producers (such as Ricoh, Jujo, and Kanzaki), using similar dye-based chemistry, formed partnerships with barcode printer manufacturers (such as TEC, Sato, and others) and entered the emerging global bar code industry, primarily in supermarkets. 1822 0 obj
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Leuco dye is a primary and crucial component in the production of thermal paper products. Leuco Dyes. startxref
2010). The dyes are rarely applied on materials directly; they are usually in the form of microcapsules with the mixture sealed inside. [11][12] BPA can transfer readily to the skin in small amounts: When taking hold of a receipt consisting of thermal printing paper for five seconds, roughly 1 μg BPA (0.2–0.6 μg) was transferred to the forefinger and the middle finger if the skin was rather dry, and about ten times more than this if these fingers were wet or very greasy. The magenta layer is in the middle, sensitive to longer pulses of moderate temperature. The cyan layer is at the bottom, sensitive to long pulses of low temperature. Texas Instruments invented the thermal print head in 1965, and the Silent 700, a computer terminal with a thermal printer, was released in the market in 1969. ";s:7:"keyword";s:19:"what is a leuco dye";s:5:"links";s:3940:"<a href="http://digiprint.coding.al/site/page.php?tag=41e064-matcha-condensed-milk-ice-cream">Matcha Condensed Milk Ice Cream</a>,
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