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A platen (or platten) is a platform with a variety of roles in printing or manufacturing. It can be a flat metal (or earlier, wooden) plate pressed against a medium (such as paper) to cause an impression in letterpress printing. [1] Platen may also refer to a typewriter roller which friction-feeds paper into position below the typebars or print ...
A spot plate, also called a reaction plate, color test plate, [1] or spotting tile (British English), is a laboratory tool made either from ceramics or plastics. [2] Each plate consists of many cavity-like depressions in which only small amount of reactants can be added at a time. [ 3 ]
Both the plate and the carrier are then rotated and the carrier is kept oscillating; this can be better seen in the top view of Figure 2. A downward pressure/down force is applied to the carrier, pushing it against the pad; typically the down force is an average force, but local pressure is needed for the removal mechanisms.
Both methods yielded plates that could be preserved in case of future needs, for example in the printing of novels and other books of unpredictable popularity. The movable type used to compose the original forme could then be re-used. Both methods could be used to prepared curved plates for rotary presses, which were used for the longest print ...
A theoretical plate in many separation processes is a hypothetical zone or stage in which two phases, such as the liquid and vapor phases of a substance, ...
Plating is a finishing process in which a metal is deposited on a surface. Plating has been done for hundreds of years; it is also critical for modern technology. Plating is used to decorate objects, for corrosion inhibition, to improve solderability, to harden, to improve wearability, to reduce friction, to improve paint adhesion, to alter conductivity, to improve IR reflectivity, for ...
It is performed on a TLC plate made up of a non-reactive solid coated with a thin layer of adsorbent material. [2] This is called the stationary phase. [2] The sample is deposited on the plate, which is eluted with a solvent or solvent mixture known as the mobile phase (or eluent). [3] This solvent then moves up the plate via capillary action. [4]
There are five recognized classes of gold plating chemistry: Alkaline gold cyanide, for gold and gold alloy plating; Neutral gold cyanide, for high-purity plating; Acid gold plating for bright hard gold and gold alloy plating; Non-cyanide, generally sulphite or chloride-based for gold and gold alloy plating; Miscellaneous