Printing press stripper

CODE: Determines proportions needed to reduce or enlarge photographs and graphics to fit in designated areas of film flat and prevent color overlap, using calculator or proportion scale. Touches up negatives to conceal pinholes and other imperfections, using artist's brush and opaque material, or examines positive film, using magnifier, and repairs broken lines and incomplete and missing half-tone dots, using needle and crayon pencil. Tapes layout sheet or grid to illuminated table and positions masking sheet and transparent plastic sheet over layout grid to prepare for positioning of film. Positions film negatives or positives on masking sheet or transparent plastic sheet according to predetermined reference marks on layout sheet and inserts illustrations, halftones, or four-color process negatives in windows of base negatives or complementary flats flats that will be exposed onto same plate , using tape, triangles, straightedges, dividers, and magnifiers. Selects and inserts screen tints in film flat, using knowledge of dot percentages required to obtain specific colors.
8:27
09.02.2021
745

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Lithographic Stripper Career

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Wiper, scraper, stripper for the printing industry | B2B Shop

This invention relates to strippers for stripping sheets from rotating drums such as the printing drum of a printing press. It has been illustrated in conjunction with operating mechanism which causes the point of the stripper to extend momentarily within the circumference of the printing drum as the sheet approaches the stripper so that it will be impossible for the sheet to pass between the drum and the stripper. The stripper can be used without this operating mechanism, however, and in fact under any circumstances in which a stripper is desired. The illustrated form of the stripper is more effective and satisfactory than any known heretofore and, accordingly, it finds its greatest need under the most adverse stripping conditions such as those found in offset printing, for example. In offset printing the sheet never touches the type or plate roll but instead the ink is applied by the plate to a rubber blanket which in turn applies it to the sheet.
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Wiper / Stripper / Scraper

JR 2,, Brown, Jr. It has been illustrated in, conjunction with operating mechanism which causes the point of the stripper to extend momentarily within the circumferenceof the printing drum as the sheet approaches the stripper so that it will be impossible for the sheet to pass between the drum and the stripper. The stripper can be'used without this operating mecha-.
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In prepress, the attaching of film negative s of a page—which can either be a single negative or the combination of one or more additional negatives exposed separately such as halftone s or other types of strip-in —on the back of a carrier sheet such as goldenrod. All the pages must be assembled on a single sheet of goldenrod in the correct imposition. Holes are then cut in the front of the carrier sheet over the image areas of the negative, and extraneous pinholes or other undesired images are blotted out with a thick red or black fluid or pen a process called opaquing. The process of stripping produces a flat which is then used to expose a plate prior to printing. In electronic publishing systems, a type of electronic stripping places all the page elements and pages in the proper position and imposition on the digital layout.
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