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However, screen printing has industrial applications as well. There are three basic screen printing methods; flatbed screen printing, cylinder screen printing and rotary screen printing. Flatbed screen printing is the perhaps the simplest form of screen printing where a material with a graphic is stretched over a frame. The ink is then pushed through the screen with a squeegee to create a graphic image on the printed surface. Cylinder screen printing operates similarly to flatbed screen printing but it uses a rolling cylinder as to apply the ink.
Rotary screen printing is designed for industrial scale screen printing. Rotary screen printing uses ink filled cylinders where the substrate is rolled over the cylinders to receive an image. Rotary screen printing is commonly used for applying graphic pattern to items such as wallpaper.
Inkjet Printing
Unlike screen printing, inkjet printing relies on a complex system of electrical impulses to shoot miniscule amounts of ink onto a special inkjet paper to create a graphic. The concept is not entirely different from a very sophisticated version of spray paint.
Inkjet Paper
An inkjet printer’s capability to produce better high-quality graphics than screen printing relies on quality inkjet paper. Inkjet paper is usually dictated by five elements; opacity, weight, thickness, brightness and gloss. Opacity is the amount of light which the inkjet paper allows to pass through. Highly opaque inkjet paper will cause the two graphics to clash with each other. Weight simply refers to how heavy one square meter is and inkjet paper generally runs in the 10 to 30 pound weight range. Most inkjet paper has a thickness between 4 to 10 mils. An inkjet paper’s brightness is judged on a scale of 1 to 100 with inkjet paper generally falling in the upper 90s. The most unique aspect of inkjet paper is its gloss. Gloss refers to the shiny quality of the paper with high gloss inkjet paper reflecting a great deal of light.
Synthetic Paper
Particularly in light of the new trend for “Green Solutions” a move to using synthetic paper has begun. Synthetic papers however are really nothing new. In the 1960s Union Carbide developed the world’s first synthetic paper called Ucar. More recently a Taiwanese firm has developed a synthetic polypropylene film sold under many names but commonly called Nan Ya for industrial screen and inkjet printing.
Synthetic papers such as Nan Ya offer two clear advantages over wood-based papers. They are more environmentally friendly and a superior product.
Environmentally, Nan Ya paper eliminates the use of trees in paper production. Additionally, Nan Ya synthetic paper is easy to dispose of as it does not release toxins when burnt and Nan Ya causes less damage to the paper incinerators.
In addition, Nan Ya paper is more durable than wood-based paper and has better colour properties or printing graphics. Since Nan Ya won’t tear or puncture, Nan Ya is ideal for printing heavy use products such as outdoor labels, menus, maps and manuals. Furthermore, Nan Ya’s strength not only increases the life of the product but it also causes less damage to the printing machines. Additionally, as Nan Ya’s polymer qualities act as a type of plastic coating and Nan Ya paper eliminates the need for waterproofing. Finally Nan Ya boasts great absorption properties which lead to less ink bleeding and results in a sharper more colourful graphic.
Article Source: http://www.articlemotron.com
A common printing technique is screen printing. Screen printing is a versatile technique. Screen printing can place graphics on a variety of surfaces from fabric and wood to glass and screen printing can also be used to place graphics on very thick objects. Screen printing is popular with amateur printers as they can easily create their own t-shirts or posters with a simple screen printing set up.
Zoe Guven is author of this article on Screen Printing. Find more information about Inkjet Paper here.
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