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Offset Printing

Basic Facts and Features

Offset printing applies wet ink to paper by means of a roller and blanket that transfer the image from a metal plate. After you sign your proof ticket indicating the job is ready to print, your pages are output to negatives in the pre-press area via the Agfa Imagesetter. The image from the negative is then transferred to a metal plate by a photographic process. The plate is chemically treated to accept ink only on the image areas. Ink is offset onto a cylinder called the blanket, then onto paper, hence the name "offset printing."

When is Offset More Practical than Quick-Copy?

Your job will be run on an offset press when:

While most Xerox duplication requests can be produced in 24 hours or less, offset printing requires more time because of the setup required (including pagination, proof reading and preparation of printing plates from negatives). Less than one-third of the scheduled production time represents actual press time, and your estimated 3-week production time may be considerably shortened by returning your proof quickly. (See Tips.)

How to Place an Offset Printing Request

You will have several choices to make, and the person delivering your printing request should be prepared to provide the following information:

Jobs placed without complete information may not be produced within the normal time frame. For example, if paper is not selected and quantity established when the job is placed, your order may be ready for the press but waiting while paper is being delivered.

Selecting Paper and Ink

Publications and Printing can provide offset printing on most types of paper stock including bond, book, text, cover, index, tag, pressure-sensitive carbonless, gummed labels and Kraft envelopes; or any finish, including matte, coated, vellum, linen, parchment, woven, laid, etc.

The most often-used text and cover weight paper is stocked in our facility. Samples of other papers can be reviewed in books available at the front desk. Paper orders are placed and delivered daily. P & P also maintains a substantial inventory of ink. An ink selector showing the various stocked ink colors is available at the front counter. Special order inks can also be obtained for you. Cost is usually about $50 per can.