Screen printing is a printing technique whereby a mesh is used to transfer ink onto a substrate, except in areas made impermeable to the ink by a blocking stencil. Screen printing is also a stencil method of print making in which a design is imposed on a screen of polyester or other fine mesh, with blank areas coated with an impermeable substance. Ink is forced into the mesh openings by the fill blade or squeegee and by wetting the substrate, transferred onto the printing surface during the squeegee stroke. As the screen rebounds away from the substrate the ink remains on the substrate. It is also known as silk-screen, screen, serigraphy, and serigraph printing. One color is printed at a time, so several screens can be used to produce a multi coloured image or design.

Screen printing is arguably the most versatile of all printing processes. It can be used to print on a wide variety of substrates, including paper, paperboard, plastics, glass, metals, fabrics, and many other materials. Including paper, plastics, glass, metals, nylon and cotton. Some common products from the screen printing industry include posters, labels, decals, signage, and all types of textiles and electronic circuit boards. The advantage of screen printing over other print processes is that the press can print on substrates of any shape, thickness and size.

Screen-printing is a fantastic technology that is used by many industries with so many old, new and not yet discovered applications – both flat (plastics, cloth, metal, thin to thick papers, sunpack/sunboard, rubber, leather, wood, glass, foot wears, PCBs, ceramics, etc) and non-flat substrates, by using appropriate machinery and inks.

The most important piece of equipment for screen printing is the screen. The simplest screen for screen printing is nothing more than a piece of mesh stretched across a square wooden frame. In order to make a stencil on the mesh, an image is first drawn on the mesh. Certain areas of the mesh are then covered with an ink-blocking substance, which makes it impossible for ink or paint to pass through. Utilization of screen printing presses has begun to increase because production rates have improved.

Today, Screen printing offers ample innovation and creativity, thus playing a major role in printing industry because of the availability of advanced screen printing machines, UV technology coupled with availability of innovative special effects inks. Screen printing is now quicker, cheaper, produces better quality images and offers a number of special applications. Quality in screen printing seems to have come a long way. Today, with automatic precision machines, it is possible to get a result that years ago would have been a dream. 

Screen printing has its own distinct advantages – versatility, suppleness, and wide range of applications, brightness and solidity of colours for outdoor applications, possibilities of special effects in graphic and textile; and wide range of presses available for different applications. It also provides a possibility of combination printing with other imaging and printing processes like offset, digital, etc.

Some fundamentals of this book are basic concept and classification of stencils, basic screen printing process, basic registration techniques, screen printing frames, pre treatment of screen printing fabrics, screen printing press, principal of screen process printing, printing on paper and card, printing on vertical surfaces, printing on shaped objects, cylindrical object printing, printing on uneven surfaces, ceramic and glass printing, printing on plastics etc. This method of Printing has achieved wide spread popularity since the Second World War, although the basic ideas in this process were used by the Chinese centuries ago.

The present book contains latest technologies of screen printing along with machinery photographs, addresses of suppliers of machinery and raw materials. This book will be very helpful to new entrepreneurs, existing units and for those who want to diversify in to this field.

 

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