frisket

A frisket is a thin, typically brass or steel frame that clamps onto the platen (the flat pressure surface) of a printing press to hold the paper sheet in precise position during impression. It also serves as a mask, exposing only the area of paper that should receive ink while protecting the margins and non-printing zones from contact with the type or plate. The frisket is essential for consistent registration and clean edges across multiple impressions.

The frame itself is lightweight but rigid, usually constructed from a sheet metal stock around 0.5 to 1.5 mm thick. A spring-loaded hinged mechanism or lever system allows the operator to swing the frisket away from the platen after printing so the printed sheet can be removed and a fresh blank inserted. On hand-fed platens and some automated presses, the frisket opening is cut or die-stamped to match the exact boundary of the printing area; on other machines, it may be a simple rectangular aperture adjustable by sliding guides.

Frisket tape and overlay work

In relief and letterpress work, the frisket must be built up with precision. Operators often attach thin paper or film overlays to the underside of the metal frame using adhesive or grippers, creating a perfect register fit around the type. This frisket overlay prevents ink from squeezing under the edges of the type and marking the sheet margins. Where type height varies or the form sits unevenly, the frisket layer is shimmed with paper packing to maintain even contact pressure.

Worn or badly fitted friskets cause marginal ghosting, misalignment, and uneven ink transfer. The metal frame can warp if subjected to excessive clamping force or heat cycling, particularly on older presses where adjustment is manual and crude. A bent frisket will rock on the platen, causing the sheet to shift mid-impression and ruining registration across a run.

The term frisket derives from the French frisquette, which itself came into use in early printing workshops in the 16th century. The word originally referred to a thin wooden or metal frame used in printmaking; its meaning has remained largely consistent through centuries of press design evolution, from hand presses to modern semi-automatic equipment where the frisket is integral to the feeding and positioning system.