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Other Printing Methods

Although offset litho, digital and large format — cover the vast majority of our work, there are always situations we need something a little different.

Hot foiling

Hot foiling works by pressing a specially made, heated metal die against a coloured foil and the product to be printed. Where the hot die meets the foil, it melts and is permanently bonded to the surface.

Although commonly used for books, as shown above, it can be used on a variety of papers and cards to great effect, but as might be expected from a process requiring the manufacture of a metal die, it is rather costly. Once the initial cost of the die has been met, however, it can be used for subsequent print runs at a much lower cost.

Crash numbering

Used exclusively for NCR (no carbon required) forms, crash numbering involves striking the topmost form of a set with metal numerals on inked rotating wheels. The impact causes the number to appear on all of the sheets in the set. The wheels rotate as the next set is moved into position so that all the sets are numbered uniquely.

Screen Printing
The equivalent of the printing plate for the screen printer is the SCREEN - a wooden or aluminium frame with a fine nylon MESH stretched over it. The MESH is coated with a light sensitive emulsion or film, which - when dry - will block the holes in the mesh. The image that needs to be printed is output to film either by camera or image-setter. This film positive and the mesh on the screen are sandwiched together and exposed to ultra-violet light in a device called a print-down frame. The screen is then washed with a jet of water which washes away all the light sensitive emulsion that has not been hardened by the ultra-violet light. This leaves you with an open stencil which corresponds exactly to the image that was supplied on the film. Now the screen is fitted on the press and is hinged so it can be raised and lowered. The substrate to be printed is placed in position under the screen and ink is placed on the top side of the screen, (the frame acts also as wall to contain the ink ). A rubber blade gripped in a wooden or metal handle called a SQUEEGEE (not unlike a giant wind-screen wiper) is pulled across the top of the screen; it pushes the ink through the mesh onto the surface of the substrate you are printing. To repeat the process the squeegee floods the screen again with a return stroke before printing the next impression.

Thermography Printing

Thermographic printing is a popular way of enhancing the effect of print in a diverse range of applications.

The thermographic process basically works with any wet-ink process and involves passing the printed sheets direct from the press through a system in which the powder resin is applied. The resin adheres to the wet ink and is removed from all other areas of the sheet. The substrate is then heated to make the resin melt and fuse with the ink.

The final result is a raised or three-dimensional printed effect.

 


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Request Print Ltd | 28 Raleigh Crescent, Worthing, West Sussex, BN12 6EE. Tel: (01903) 529725 | Fax: (01903) 753914
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