Termal coating papermaking

They have good surface properties, high print gloss and adequate sheet stiffness. The paper can be soft nip calendered or supercalendered.

Termal coating papermaking

Termal coating papermaking

Thermal paper A receipt printed on thermal paper. A heat source near the paper will color the paper. Paper roll for thermal fax machine. Thermal paper is a special fine paper that is coated with a chemical containing BPA that changes color when exposed to heat. It is used in thermal printers and particularly in inexpensive or lightweight devices such as adding machinescash registersand credit card terminals.

Termal coating papermaking

The surface of the paper is coated with a solid-state mixture of a dye and a suitable matrix; a combination of a fluoran leuco dye as an example. 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 reactant acid in thermal paper is often bisphenol A BPA. Usually, the coating will turn black when heated, but coatings that turn blue or red are sometimes used. While an open heat source, such as a flame, can discolor the paper, a fingernail Termal coating papermaking quickly across the paper will also generate enough heat from friction to produce a mark.

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Multicolor thermal paper first became available in the early s with the introduction of the Fuji Thermo-Autochrome TA system. History The earliest direct thermal papers were developed by NCR Corporation using dye chemistry and 3M using metallic salts. The NCR technology became the market leader over time, although the image would fade rather rapidly compared with the much more expensive, but durable 3M technology.

Texas Instruments invented the thermal print head inand the Silenta computer terminal with a thermal printer, was released in the market in The Silent was the first thermal print system that printed on thermal paper.

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During the s, Hewlett-Packard integrated thermal paper printers into the design of its HP series desktop computers, and integrated it into the top of the series CRT terminals as well as in plotters.

In the s and early s, Japanese producers such as RicohJujo, and Kanzakiusing 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.

Leading pressure-sensitive label producers such as Avery Dennison became major consumers of direct thermal paper for label applications.

In the late s and early s, thermal transferlaser printingelectrophotographyand, to a lesser extent, ink jet printing began to take away industrial and warehouse barcode applications due to better durability. Direct thermal made a strong comeback with point of sale receipts gasoline pumps, cash registers, rental car receipts, etc.

DuringNintendo used thermal paper technology for their Game Boy Printer. InNCR Corporation's Systemedia division introduced two-sided thermal printing technology, called "2ST" Chemistry Four different types of imaging chemicals are used in thermally sensitive papers: A third widely used leuco dye is Crystal Violet lactone.

Red or magenta color can be achieved with dyes such as Yamamoto Red Yellow can be produced by the protonation of a triaryl pyridine, such as Copikem Yellow 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.

Developers Leuco dyes, in general, provide little color when melted unless they are melted in conjunction with one or more organic acids.China High Thermal Conductivity Aluminum Plate manufacturers - Select high quality High Thermal Conductivity Aluminum Plate products in best price from certified Chinese High Temperature Tubes manufacturers, Grade Aluminum suppliers, wholesalers and factory on timberdesignmag.comps://timberdesignmag.com Thermal paper is a special fine paper that is coated with a material formulated to change color when exposed to heat.

Usually, the coating will turn black when heated, but coatings that turn blue or red are sometimes used. While an open heat source, such as a flame, can discolor the paper, a fingernail swiped quickly across the paper will.

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