(L) Logging Records
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A record of an individual tree’s weight, volume, geographical origin and cutting date.
(l) lpi
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see Lines per inch.
(L) LWC
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Lightweight coated paper with a grammage below 60 g/m2.
(L) L*a*b*
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Colour based on values of light (L), red/green (a) and yellow/blue (b).
(L) Label papers
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A large variety of body papers that are made to be gummed, or for application of a self-adhesive material.
(L) Laid lines
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A continuous watermark consisting of very close parallel lines, generally associated with spaced lines called chain lines at right angles to them.
(L) Laid paper
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Usually printing or writing paper with a ribbed appearance caused by the use of a wire roll or dandy roll at the wet end of the papermachine
(L) Laminate
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A converted product made by combining together suitable paper or board either with other paper or board or with other materials such as plastics or metal foil, generally by means of an adhesive, to form a product with particular qualities.
(L) Laminating
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A surface coating applied after the printing process.
(L) Laser printing
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Images are produced through electronic impulses using an intense focused beam of light. (Laser: Light Amplification by Stimulated Emission of Radiation).
(L) Lay
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The position of print on a sheet of paper.
(L) Layboy
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A stacking device on a paper cutter.
(L) Layout
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An overall term to describe the design of the print or artwork.
(L) Lean manufacturing
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Identifying and eliminating wasteful resources within an organisation – whether that is raw materials, man hours, power etc. Manufacturing then becomes most cost efficient, clean and efficient. Lean encompasses good organisation with optimised workflow and value for customers, whilst often providing a better environment for employees. It can also help to make a company more environmentally friendly. Its implementation is centred on getting the right elements to the right place at the right time in the right quantity to achieve perfect workflow, while minimising waste and being flexible.
(L) Letterpress
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Printing from images with a raised surface, which are inked and impressed directly onto the surface of the material.
(L) Lick coating
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A light form of mineral coating, achieved by supplying the surface sizing press of the papermachine with coating material instead of normal surface sizing solution.
(L) Life cycle Open info
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All stages in the lifetime of a product from raw materials through to use and disposal. It includes production of raw materials, the production, processing, storage, transport of materials and disposal.
(L) Light fast
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Inks that will not fade to any significant extent even after prolonged exposure to light are termed light fast.
(L) Lightweight coating
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Coating applied at 7 to 10 g/m2 on one or both sides of the paper.
(L) Lightweight printing paper
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Printing paper with high bulk and a grammage under 40 g/m2, used in telephone directories, sales catalogues and airmail projects.
(L) Lignin
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A substance in wood that binds its fibres together and reinforces its structure. Lignin is removed in the manufacture of chemical pulp.
(L) Lines per inch (lpi)
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A gauge of resolution quality.
(L) Line work
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A printing term used to describe printing in which lines of ink, or solid blocks of ink, appear.
(L) Lint
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Surface fibres released from paper during printing.
(L) Linters
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The short fibres removed from cotton seeds after ginning.
(L) Listing paper
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A form of continuous stationery used for computer listings, punched with sprocket holes at the edges and traditionally printed with light green horizontal lines set to the same pitch as the printing device.
(L) Lithographic printing
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A planographic (ie flat surface) printing process in which the non-image areas of the printing plate are made ‘wettable’ and the image areas are made to repel water whilst attracting the printing medium (ink).
(L) Long grain
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The fibres in paper naturally take up an alignment roughly parallel to the direction of travel of the web on the papermachine; this becomes the grain direction. When cut, the paper’s grain direction may be parallel either to the long edge of the finished sheet (when it is called long grain) or the short edge (short grain). Papers are normally stocked in long grain form, short grain being supplied to special order. The grain direction affects the stiffness in a particular dimension and must be taken into account when planning a job that needs to be folded, as paper usually folds easier with the grain.
(L) Look through
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The appearance of a paper when held up to transmitted light. It discloses whether the formation is even and uniform or lumpy and ‘wild’. For graphic purposes, a regular, even look through is desirable, indicating a well made, uniform sheet.
