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  • Technique Offset Printing – Chung Phat Packaging

    Today’s offset printing has become the most common printing technique in commercial printing. However, in prints for personal enjoyment, it is possible to create a handful of high quality prints using direct print. Some people still prefer the floating lines left on paper from direct printing. Even some of these books are printed in prints from leaded letters, which are typo prints, a rather ancient technology.

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    The first offset and lithography printer was born in England around 1875 and was designed to be printed on metal. Offset made of cardboard photo paper to print from lithography to metal surface. About 5 years later, cardboard was replaced with rubber.

    The first person to apply offset printing for paper printing could be Ira Washington Rubel in 1903. He stumbled across each time a sheet of paper was not fed to his lithograph machine in a rhythmic manner. The lithograph prints on the rubber-coated drum, and the next sheet of paper is stuck with two photos: a lithographic print on the top and a printout from the drum on the underside. Rubel also noticed that the print from the rubber stamp was stiffer and cleaner because the soft rubber pads were on paper rather than hard rock prints. He decided to print it through rubber sheets. Independently of Rubel, brothers Charles Harris and Albert Harris also discovered this and built offset printers for Harris Auto Printing Company.

    Harris’s designs, developed from spinning rotary printers, are very similar to those shown in the article. It consists of a print drum tightly packed with ink rolls and water. A rubber blanket is exposed just below the drum set. The print drum underneath is responsible for pressing the paper into the rubber drum to transmit the image. Today, this basic mechanism is still used, but many improvements have been made, such as adding double sided printing or reloading paper (instead of paper sheets).

    In the 1950s, offset printing became the most common printing technique for commercial printing, after many improvements were made to text, ink and paper, optimizing print speed and lifespan. Lettering Today, most printing, including printing press, uses this technique.

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    Offset printing is a printing technique in which ink-shaped images are pressed onto rubber sheets (also known as offset plates) first and then pressed from the rubber sheet onto paper. When used with lithography, this technique avoids the water being sticky on paper inks.

    The advantages of this printing technique are:

    – High image quality – Strokes and clean prints directly from the print on paper because the rubber pad is uniformly applied to the print surface.
    – Ability to apply printing on many surfaces, including non-flat surfaces (such as wood, fabric, metal, leather, rough paper).
    – Making prints easier.
    – Printouts have a longer shelf life – because they are not directly exposed to the surface to be printed.

    Today’s offset printing has become the most common printing technique in commercial printing. However, in prints for personal enjoyment, it is possible to create a handful of high quality prints using direct print. Some people still prefer the floating lines left on paper from direct printing. Even some of these books are printed in prints from leaded letters, which are typo prints, a rather ancient technology.

    The most important criterion for evaluating offset quality is that the printout must be similar to the sample (or proof sheet) of color and the sheets should be evenly colored (no color variation) throughout the output. print.

    In fact, customers often complain that the printout is not the same color as the print and the printouts are not uniform.

    The most important factors in the printing process affect the color of the printed pages (and thus the print quality):

    • Thickness of the ink on the paper (proportional to the density of the cardboard density when measured with a densimeter)

    • The magnitude of the tram

    • Toner stacking (fastened to color overlay order).

    In order to assess the effect of these factors, in addition to visual observation, one must use measuring instruments for objective evaluation, eliminating subjective hallucinations. The most common tool is the densitometer.

    Within the scope of this article, please mention only the third factor is the problem of color overlay order, its effect on print quality, which is a matter of concern to you.

    The color overlay order affects toner receipt and therefore affects the print color. There is a difference when printing a color on white paper, printing that color onto a preprinted ink, or printing 2 or 4 wet – wet printing. When wet printing – stacking – drying (ie printing multiple colors on a single color) and wet – stacking – wet, the ink levels are different to affect printing results, wet – stacked – wet. The tack of the ink plays a very important role, it has been reduced from head unit to end unit.

    Contact

    Address: Chung Phat Hung Yen Co., Ltd

    Website : http://chungphat.com

    Phone: (+84) 2213 788 282

    Email: Sales@chungphat.com