File Preparation: Foil & Embossing Die File Preparation

Foil & Embossing Die File Preparation

When creating image files for foil and embossing dies, it's best to follow the precept of "Simpler is Better." If you have been creating print production art for a while, you are most likely familiar with PMTs (Photo Mechanical Transfers). Like preparing line art to be shot as a PMT, foil and emboss die files should be clean (preferably vector EPS format) with only solid black and white image areas – no screens or halftone dots.

Modern letterpresses are capable of great precision in terms of registration and total image area impression. Most often limitations with foiling and embossing are due to the paper substrate. The thinner the paper is, the less emboss detail there is. Similary, the degree of detail possible with a foil stamped image is related to the degree of surface texture of the paper. With these points in mind, we recommend that you discuss possible limitations and expectations project with your Sales Rep before committing to your final design.

It's worth mentioning that foil generally adheres best to smooth, uncoated sheets. When large areas of foil are to be applied over a solid ink area, a knock-out should be created so that the foil adheres directly to the paper, especially if it is coated paper. Like trapping, it's best to leave creation of this type of knock-out to our prepress techs. Be aware that a large knock-out of a large ink solid can create "ghosting" on press, depending upon the color, ink coverage and orientation of the solid image on the sheet relative to the press' ink rollers. Applying foil over coatings and/or varnishes is generally discouraged and should be discussed with your Sales Rep before committing to your final design.

Whether you are foiling, litho-registered embossing or blind embossing, it's always important to place an FPO image in your document using X and Y coordinates for precision registration and clearly indicate the nature of the letterpress impression (ie; foil stamp, litho-registered emboss, blind emboss, deboss, etc.) on your printed proofs – as well as foil color specifications along a swatch chip, if available.

If possible, it's a good idea to create a rendering that effectively demonstrates the contour and relief of multi-level and sculptured emboss dies.

As always, if you are unsure about die art creation for your project, you can leave it to our prepress techs or contact our Digital Prepress Department with specific technical questions.

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