Search

Glossary

Clicking a letter link will take you to the relevant section.

 
LACQUER
A clear-gloss coating applied to printed material for gloss, grease resistance, heat sealing and improved appearance. Usually a clear, overcoating imparting such properties as high gloss, heat sealing, improved surface appearance, etc. Historically have been organic solvent based, but can now be water based. See varnish.

LAID
A finish which gives the appearance of lines across the sheet due to fine copper wires in the mold.

LAID FINISH
Paper with a watermarked pattern of closely spaced lines created by dandy roll on a paper machine. The lines run across the grain of paper and form a ladder-like appearance in the sheet. The laid pattern is applied to the felt side.

LAID PAPERS
Papers with a "grid" pattern in the sheet, resulting from the pulp resting against wires on the papermaking mould screen. "Laid" lines are closely spaced while "chain" lines are farther apart & run parallel with the grain direction of the sheet, important when folding papers, especially to bookbinders.

LAID PATTERN/PAPER
A water mark pattern in paper resulting in parallel lines in both the machine and cross directions of the web of paper.

LAMINATE
Multi-ply paper and paperboard consisting of firmly united layers that may be bonded with resin or adhesive.

LANDSCAPE MODE
A printer (usually driven by a computer) output orientation in which the printed lines run parallel to the direction of movement of the paper; see portrait mode.

LASER COMPATIBLE
Paper that performs on a laser printer or copier. Laser compatible paper has good dimensional stability that keeps it from curling, changing shape, and causing paper jams in printer and copiers.

LASER COHERENT LIGHT
An abbreviation or acronym for "Light Amplification by the Stimulation of Emission of Radiation."

LASER CUTTING
Coherent light of sufficient intensity to be able to physically cut or burn; used in delicate surgery for example.

LASER PRINTERS
Electrostatic/Xerographic printers using a LASER as the light source activated by an electronic media, rather than by optical means using reflected light from an original, as used in copiers to remove charges from the photoreceptor in the non-image areas.

LATEX
Naturally occurring liquid (rubber tree), but now synthetically produced, used as an adhesive in the coating of paper.

LAYDOWN SEQUENCE
See color sequence.

LAYOUT
This is an artist's conception (the master plan or "blueprint") of the finished printed job. Layouts can be very rough, semi-comprehensive, or so comprehensive that nothing is left to the imagination.

LCD
Abbreviation for "liquid crystal diode"; used in electronic displays, such as on watches, but emitting no light; see LED.

LEDGER PAPER
Strong, fully-sized paper made from bleached chemical wood pulp used to make accounting and record books. A strong, smooth writing paper, originally designed for accounting records and ledgers. Measured on a bond or business papers basic size of 17" x 22".

LED
Abbreviation for "light emitting diode"; used in electronic displays, such as on watches; see LCD.

LENGTH
Describes a property of printing ink that is the distance a finger and thumb can be pulled apart while maintaining an unbroken "thread" of ink between the two; as such, inks can be described as "short" or "long." Length is related to both viscosity and tack, as a fluid or body property of ink.

LETTERPRESS
A method of printing by hard, raised type. A relief printing method done using cast metal type plates on which the image or printing areas are raised above the nonprinting areas. Ink rollers touch only the top surface of the raised portions of printing plates or type. Papermakers today follow the same steps that its inventor, ts'ai lun, followed almost two thousand years ago: pulping vegetable matter and leaving the cellulose fibers behind. Mixing the pulp with lots of water; draining it; forming paper on a sieve-like mold; pressing the paper to remove some of the water; and dying it to remove the rest of the water. Technology has sped up the process and helped to improve the smoothness, brightness, and printability of the paper, but it hasn't changed the essence of paper making.

LETTERPRESS PRINTING
Printing process in which ink is applied to paper, paperboard or film from raised portions of printing plates or type. A form of relief printing. The printing method where ink is applied on all raised areas on the plate; the non-image or background area is cut away or removed, i.e., relieved. Can be likened to a "rubber stamp," though the plate can be made of wood, metal, or other non-flexible material. Dry offset is really letterpress or relief printing, where the plate is a flexible synthetic material, with relief features, but can be run on an offset press (using no fountain solution).

LETTERSET
See dry offset.

LETTER SPACING
The placing of a space between each letter of a word.

LEVELING
The property of a coating or ink causing it to flow out as would a true liquid. As a corollary, a paint or coating that leaves "brush or roller marks" has poor leveling or flow properties.

LIFT
A pile of sheets of paper; usually the amount placed under the knife of a cutting or trimming (guillotine) machine.

LIGHT FASTNESS
The ability of paper to resist change in color, fading and yellowing (like newsprint) upon exposure to light.

LIGHTWEIGHT
A term applied to papers made in weights below the normal minimum basis weight of the grade in question.

LIGHTWEIGHT PRINTING PAPER
Printing paper having exceptionally high opacity for its weight and designed for printing applications requiring lightweight paper, with basis weight in the range of 17-40 lb./25 x 38-in. ream (25-59 g/m).

LIGNIN
The constituent in wood which holds the fibers together. Lignin is removed in chemically cooked pulps but remains in groundwood, mechanical or semi-chemical pulps. Lignin in paper causes the sheet to fade and yellow when exposed to light. Newsprint is an example of paper containing lignin. A part of the "glue" in wood, naturally occurring, that holds the cellulose fibers together.

LINE AND TYPE
Printed material consisting of lines of type only. No halftones or illustrations.

LINE COPY
Any copy with no gradations in tone, suitable for reproduction, without using a screening technique.

LINE HOLES
The holes punched along one or both edges of a continuous form to feed by pins or sprocket the form through the imaging or functional device.

LINEN FINISH
A paper surface design made by embossing the paper with a linen cloth pattern. An embossed finish to simulate the pattern originally obtained by pressing paper between sheets of linen cloth.

LINERBOARD
Kraft paperboard, generally unbleached, used as facing materials in the manufacture of paperboard containers and as the outer layers of plaster building boards.

LINT
Fibrous materials on the surface of a sheet of paper, but unlike fuzz, is not normally attached to the surface.

LITHOGRAPHIC PRINTING
Stone printing. See offset lithography.

LITHOGRAPHY
Term used to describe the offset printing process where by water and ink are used.

LOCALIZED WATERMARK
Watermarks (created by a dandy roll) arranged to appear at a definite location in a particular size sheet of paper.

LOFT DRYING
See festoon (2).

LOGO / LOGOTYPE
A single image which generally contains a symbol, trade mark, or identifying name of a business, association or product.

LONG INK
See length.

LOOSE CORE
When the paper at the core is not fastened properly to the core or comes loose, the core can rotate at a different rate than the winding or unwinding surrounding paper. This can cause tension and draw control problems in processing the roll.

LONG FIBER PULP (LF)
General term given to pulps produced from soft woods such as pine. The fiber length of the pulp is long compared to that of hardwood.

LTL CARRIERS
See Common Carriers.

LUBRICANTS
In coatings, chemicals added primarily to improve flow and finishing properties.

L.A.B.
See color measurement.


 
Beyond Paper®
Learning
Contacts & Requests
Contacts & Requests