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Speedball is a US manufacturing company of stationery and art products, based in Statesville, North Carolina. The company was originally established as the "C. Howard Hunt Pen Company" in 1899, [ 4 ] to manufacture dip pens .
Next, the original is peeled from the diazo paper as the sandwich of master and diazo exits the machine, and the diazo sheet alone is fed into the developing chamber. Here, fumes of ammonium hydroxide create an extremely alkaline environment. Under these conditions, the azodyes (couplers) react with the remaining diazonium salt and undergo a ...
The diazo copies are of different sizes and for this reason the diazo paper is obtainable in standard sizes that vary from 30 cm to 60 cm wide, after de process the copied paper can be cut to the desired size. The paper used for the diazo copies is usually a bond paper or similar type, with a diazo coating sensitive to the UV light.
The Ozalid process is a process of printing positive images on paper from patterns on film or other translucent media. Its objective is the creation of a photogram, using chemically treated paper. A transparent film with the pattern to be printed is placed on a diazo compound coated paper. This sandwich is exposed to ultraviolet light.
The process is obsolete, largely displaced by the diazo-based whiteprint process, and later by large-format xerographic photocopiers. It has almost entirely been superseded by digital computer-aided construction drawings. The term blueprint continues to be used informally to refer to any floor plan [2] (and by analogy, any type of plan).
Screen printing is a printing technique where a mesh is used to transfer ink (or dye) onto a substrate, except in areas made impermeable to the ink by a blocking stencil.A blade or squeegee is moved across the screen in a "flood stroke" to fill the open mesh apertures with ink, and a reverse stroke then causes the screen to touch the substrate momentarily along a line of contact.