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Paper & Pulp Dictionary Glossary "L"

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 Definitions for commonly used terms, words and phrases used in the pulp and paper trade

 

 

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Label
A separate slip or sheet of paper affixed to a surface for identification or description. For fiberboard boxes, includes: Full Label, Mailing or shipping Label, Spot Label and UPC (Universal Product Code) Label.
Label Paper
Mostly one-side coated papers which must be printable in 4-colour offset and gravure printing. These papers are usually suitable for varnishing, bronzing and punching and sometimes also feature wet strength and alkali resistance (See "Wet strength and alkali resistant paper") in order to en-sure the removal of the labels e.g. in the bottle rinsing machines of breweries
Laid
A finished produced with a dandy roll having closely spaced wires.
Laid Lines
A continuous watermark consisting of very close parallel lines, generally associated with spaced lines (chain lines) at right angles to these.
Laminated Paper
A paper built up to a desired thickness or a given desired surface by joining together two or more webs or sheets. The papers thus joined may be alike or different; a totally different material, such as foil, may be laminated with paper.
Laminated Linerboard
Two or more plies of linerboard adhered to one another for increased structural stability.
Laminator
A machine that adheres multiple plies of paper or fiberboard. May be used to adhere full labels to a facing, or, for enhanced structural properties, multiple facings, corrugating mediums or sheets of combined board.
Laser Printing
Xerographic printing where a modulated laser ray is projected on to a photoconductive cylinder or belt by a rotating mirror. The laser serves to product the electrostatic latent image, which is developed with toners.
Layboy
A device at the end of cutterfor jogging sheets in to a square pile.
Leachate
Water that has as a component of dissolved matter accumulated as a result of passing through material. e.g. rain water passing through waste dump. 
Ledger Paper
A strong paper usually made for accounting and records. It is similar to Bond paper in its erasure and pen writing characteristics.
Letter Fold
This common fold, used for mailings and brochures, is much like a letter folded by hand for inserting in an envelope. The letter fold produces a self-contained unit, easily handled by automated envelope inserters. For picture of this type and other fold please visit http://www.bradenprint.com/pdf/Folds-IS.pdf
Letter Press
A process of printing in which raised images are coated with ink and pressed directly onto a paper or paperboard surface
Lick Coating
A light form of mineral coating, achieved by supplying the surface sizing press of the paper making machine with coating material instead of normal surface sizing solution.
Lightfastness
The speed at which a pigment or colored paper fades in sunlight. or
How permanent a color is or how unaffected by light it is.
Light Weight Coating (LWC)
Coating applied at 7-10 g/m2 on one or both sides of the paper.
Light Weight Paper
Papers having a grammage (basis weight) normally less than 40 g/m2.
Lignin
A complex constituent of the wood that cement the cellulose fibers together. Lignin is brown in color. Lignin is largely responsible for the strength and rigidity of plants, but its presence in paper is believed to contribute to chemical degradation. To a large extent, lignin can be removed during manufacturing.
Lignocellulose
Refers to plant materials made up primarily of lignin, cellulose, and hemicellulose.
Like-Sided
Paper that has the same appearance and characteristics on both sides.
Lime Sludge or Sludge
Sludge of calcium carbonate (CaCO3) formed during preparation of white liquor in the chemical recovery process.
Linen Finish
A finished paper that has an overall embossed pattern on the surface resembling the look and feel of linen cloth, and one manufactured with engraved embossing rolls.
Liner
A creased fiberboard sheet inserted as a sleeve in a container and covering all side walls. Used to provide extra stacking strength or cushioning. Also used as a short hand for "linerboard" or facing."
Linerboard
The inner and outer layers of paper that form the wall of a corrugated board.
Lines Per Inch (LPI)
The number of lines in an inch, as found on the screens that create halftones and four-color process images (for example, "printed 175-line screen"). The more lines per inch, the more detailed the printed image will be. With the demand for computer-generated imagery, the term "dots per inch" (which refers to the resolution of the output), is replacing the term "lines per inch."
Lint
Loosely bonded fibers at the paper surface that attached to the plate or blanket of the printing machine.
Litho
A generic term for any printing process in which the image area and the non-image area exist on the same plate and are separated by a chemical repulsion. Usually oil based offset printing.
Loading
Addition of fillers
Look Through
The appearance of the paper when held up to transmitted light. It discloses whether the formation is even and uniform or lumpy and ‘wild’. For book publishing papers, a regular, even look through is desirable, indicating a well made, uniform sheet
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