label paper – Paper coated on one side, used for labeling applications.
laid dandy roll – A dandy roll made for the purpose of imparting a laid finish to paper. It is composed of wires running parallel to the roll’s axis and attached to the frame by evenly spaced chain wires that encircle the circumference of the roll. The laid wires are affixed on top of the transverse chain wires, rather than being wove over and under them.
laid lines – Lines seen in a laid sheet which are the result of the design on the dandy roll.
laid paper – The closely “lined” appearance in the finish of writing and printing papers created during manufacture by a dandy roll.
laid wires – Parallel wires in a dandy roll that produce the laid watermark and run in the cross grain direction.
laid writing – Paper used for writing and correspondence purposes that has a laid mark.
laid – Term describes the finish imparted by a dandy roll which features wires parallel to its axis that impress the paper during manufacture to produce a permanent watermark. The wires which produce the laid effect are situated parallel on the dandy roll and are not interwoven with the traverse chain wires which encircle the dandy roll’s circumference, meaning the cross direction.
laminated – Paper that is developed by fusing one or more layers of paper together to the desired thickness and quality. Often other substances like thin sheets of metal, plastic, etc. are fused to paper.
lap – The slightly extended areas of printing surfaces in color plates, which make for easier registration of color.
lap register – A register achieved by overlaying a narrow strip of the second color over the first color, at the points of joining.
last color down – The last color printed.
layout – The drawing or sketch of a proposed printed piece. In platemaking, a sheet indicating the settings for a step-and-repeat machine.
layout sheet – The imposition form; it indicates the sequence and positioning of negatives on the flat, which corresponds to printed pages on the press sheet. Once the sheet is folded, pages will be in consecutive order.
leaders – In composition, rows of dashes or dots to guide the eye across the page. Used in tabular work, programs, tables of contents, etc.
length -The ability of an ink to flow.
letterpress printing – Also known as relief typographic printing, letterpress printing employs the use of type or designs cast or engraved in relief (raised) on a variety of surfaces which can include metal, rubber, and wood. Opposite of intaglio printing, in letterpress printing the ink is applied to the raised printing surface. Non-printing areas or spaces are recessed. Impressions are made in various ways. On a platen press the impressions are made by pressure against a flat area of type or plate. Flat-bed cylinder press printing uses the pressure of a cylinder rolling across a flat area of type or plate to create the impression. A rotary web press uses a plate that has been stereotyped (molded into a curved form) which presses against another cylinder carrying the paper.
levelness – The evenness of a paper determined by the fiber distribution.
library binding – A book bound in accordance with the standards of the American Library Association, having strong endpapers, muslin-reinforced end signatures, sewing with four-cord thread, cotton flannel backlining, and covers of Caxton buckram cloth, with round corners.
lift – Maximum number of sheets handled by operator of guillotine cutting machine or by paper handler loading paper for printing.
lightfastness – The degree to which a paper or printed piece will resist a change in color when exposed to light.
lignin – Substance in trees that hold cellulose fibers together. If not removed from pulp, lignin causes paper to discolor and deteriorate rapidly. Free sheet has most lignin removed. Groundwood paper contains lignin.
likesidedness – Noticeably similar side-to-side color and finish of a sheet of paper.
line copy – Any copy suitable for reproduction without using a halftone screen.
line drawing – A drawing containing no grays or middle tones. In general, any drawing that can be reproduced without the use of halftone techniques.
line negative – A negative made from line copy.
linear paper – A watermarked sheet with lines to guide the user.
linen finish paper – A paper embossed to have a surface resembling linen cloth.
lining – The material which is pasted down on the backbone (spine) of a book to be casebound, after it has been sewn, glued off, and then rounded. It reinforces the glue and helps hold signatures together.
lint – Small fuzzy particles in paper.
lip – The allowance for overlap of one-half of the open side edge of a folded section, needed for sewn and saddlestitch binding, for feeding the sections; also called lap.
lithographic image – An ink-receptive image on the lithographic press plate; the design or drawing on stone or a metal plate.
lithographic papers – See offset papers
lithography – A generic term for any printing process in which the image area and the non-image area exist on the same plane (plate) and are separated by chemical repulsion.
localized watermark – Achieved by arranging the design on the dandy roll to leave a watermark at a predetermined place on the sheet.
logo – A mark or symbol created for an individual, company, or product that translates the impression of the body it is representing into a graphic image.
long grain – Paper made with the machine direction in the longest sheet dimension.
long ink – An ink that has good flow on ink rollers of a press. If the ink is too long, it breaks up into filaments on the press, and causes flying as on a newspaper press.
longevity – Degree of permanence.
longfold – To fold a sheet lengthwise in the direction of the grain.
loose back – A popular style of binding, in which the spine binding material is not glued to the binding edge of the sheets.
loose register – Color that fits “loosely”; positioning (register) is not critical.
low bulk – Refers to papers somewhat thinner than the usual papers of the same weight, having a smooth surface, and which is a “thin” sheet.
low-key picture – A continuous tone photo made up of predominantly shadow areas of the same tone.
lpi – The way printers reproduce images, simulating continuous tone images by printing lines of halftone spots is measured in LPI. The number of lines per inch is the LPI, sometimes also called line or screen frequency. You can think of LPI as the halftone resolution.