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Shown below are the definitions for: M
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M weight Is defined as the weight in pounds of 1000 sheets of paper of a given basis weight and size (dimensions); M is the Roman numeral for 1000.
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machine clothing See "clothing".
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machine coated Paper which is coated on one or two sides, on the paper machine; see "conversion coated".
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machine direction See "grain direction".
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machine finish The finish applied on the paper machine.
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magenta See "process colors".
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make-ready On a printing press, all work done prior to running, i.e., adjusting grippers and guides, putting ink in the fountain, mounting plates, obtaining proper ink flow through he press to the paper, etc.. Press make-ready is to be distinguished from job make-ready which also includes the paper and time to achieve register and color.
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manifold form A multi-part (multi-ply) business form normally made with carbonless paper or "forms bond" interleaved with carbon paper or tissue. Usually made with light weight, dense paper for transmitting the imaging energy down thru the plies of the form.
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master See "paper plates".
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matte finish See gloss; the non-glossy appearance resulting from being an uncoated sheet of paper, or from coating without super calendering; the least glossy paper surfaces available.
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mechanical carbonless See "spot carbonizing".
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mechanical ghosting See "ghosting".
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mechanical pulp See "groundwood"; also see "semi-chemical", "thermo-mechanical", and "refiner mechanical pulp" (RMP).
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mechanical See "paste-up".
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metric system A decimal system used by most countries other than the U.S., for solid, liquid and distance measurements; see "basis weight" and "grammage".
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microcapsules See "microencapsulation".
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microencapsulation The process of producing microcapsules, microscopic sized "packages", for controlled release. The process was an invention for, and is still used in the production of, carbonless paper, but has found widespread application, including use in pharmaceuticals and agriculture.
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micrometer A device for accurately measuring the thickness (caliper) of paper.
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MICR Magnetic Ink Character Recognition/ Reading; magnetic inks printed on business documents, like checks, so as to be easily readable by the data processing machines through which the forms are run.
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milking Also called whitening; the gradual buildup of coating or filler material (usually white pigments, thus the names) from the paper on the non-image areas of the blanket. Over time this can be abrasive to the lithographic plate, and can sensitize the non-image areas of the plate resulting in scumming. Milking can result from the softening of a coated paper surface by the first printing unit(s) fountain solution, and only be evidenced in the later or last printing unit. Whitening (dusting) is usually evidenced in the first printing units, as the result of loose pigment coming off or out of the sheet surface. If either milking or whitening is severe enough, a buildup of the white material in the non- image area can be termed "piling".
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mil See 1. caliper".
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mimeograph printing A form of "screen printing", using the porous principle; a stencil is "cut" (usually with an impact typewriter) to create porous image areas in the screen. This then allows an ink to be forced through these porous areas onto the sheet of paper brought into contact with the stencil; the paper used has a toothy, absorbent surface.
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mineral oil Petrochemical oil, that can be used as a part of the ink vehicle. A common branded series of mineral oils are called "Magie Oils".
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misting A mist or fog of tiny liquid droplets thrown off a coater (coating) or printing press (ink) by high speed rotating parts.
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moiré' pattern In process color printing, the undesirable patterns that are caused by incorrect screen angles of successive colors. Also, see " rosette pattern".
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moisture content The percent by weight of moisture in a sheet of paper; varies in paper according to atmospheric relative humidity conditions, because the paper may either absorb or emit moisture, in an attempt to reach equilibrium.
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moisture welts See "weather wrinkles".
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mottle Refers to the spotty, uneven or non-uniform appearance of either a printed surface (mostly in solid ink coverage areas), or to a nonuniform distribution of fibers in the formation of a sheet of paper. Also see "backtrap mottle".
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mullen test Also "pop" test; equipment which tests bursting strength of paper, the force necessary to punch a hole in paper.
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multi-color press A printing press which can print two or more colors on paper in one pass through the press.
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M Abbreviation for a quantity of 1000; see "M weight".
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