M
MACHINE CLOTHING
Fabrics of different types employed on the paper machine to carry the web and perform other functions. It includes the machine wire and wet and dry felts that may be composed of natural or synthetic materials.
MACHINE COATING
See On-Machine Coating.
MACHINE DECKLE
The general width of the wet web as it leaves the forming zone of the papermaking machine. Note: often used incorrectly to indicate the width of the web at the dry end of the machine.
MACHINE DIRECTION
The direction of a sheet or web of paper corresponding with the direction of the flow of ‘stuff’ on the paper machine.. Over 50% of the fibers position themselves with their lengths parallel to this direction.
MACHINE FILL OR DECKLE FILL
The width of the papermaking machine taken up by the making of the paper. For reasons of economy, it should approach so far as possible the maximum trimmed width of the machine.
MACHINE FINISHED PAPER (MF)
Paper that has been made credibly smooth by means of calender stacks at the end of the papermaking machine.
MACHINE-GLAZED PAPER (MG)
Paper which is dried on the papermaklng machine by a very large cylinder with a polished surface. The paper has a smooth and rough side. MG papers are used for wrapping papers and posters.
MACHINE WIRE
The fabric used for converting the dilute stock into a formed sheet by permitting drainage of water and retention of the other elements of the stock. It may consist of a woven wire cloth or a plastics or similar fabric that contains a suitable pattern of perforations.
MANIFOLD
See Airmail Paper.
MAXIMUM TRIMMED WIDTH
The greatest width of usable paper it is possible to make on a given papermaking machine, i.e., the full width less the essential trim to give clean edges. It is not possible to specify sizes that, in aggregate, exceed this width.
MECHANICAL PAPER
Mixture of fibre and additives like mechanical wood pulp used in a particular paper furnish
MECHANICAL PRINTINGS
Printing papers made mainly from pulp produced by the groundwood method. In this method of pulp production the wood is mechanically ground with water to separate the fibers and produce pulp. This grade may be coated on or off the machine, machine or supercalendered.
MECHANICAL WOODPULP (GROUNDWOOD)
Paper pulp produced by mechanically grinding wood logs making a weak, acidic paper that discolors upon exposure to light.
MICRO-CREPING
A process for compacting the paper web in the machine direction and imparting a high degree of stretchability by passing the web between a roll and, for example, an endless rubber blanket. The blanket is extended shortly before the point of contact with the web and allowed to return to its normal state during the passage of the web through the space between the roll and the rubber blanket. A typical example of micro-creping is the Clupak process.
MICR PAPER
Magnetic Ink Character Recognition Paper. Mostly a high-quality bond paper with good surface characteristics and dimensional stability for printing with magnetic inks for computer sorting.
MIDDLE (OF BOARD)
Furnish layer of a board placed between the two external furnish layers, or between the underliners, or between an underliner and an external furnish layer.
MILLBOARD
A thick, dense, homogeneous board for book production, made of wastepaper, on a special board-making machine, one sheet at a time. Used in binding case bound books, ledgers, etc., as binders’ boards.
MIS-REGISTER
The impression of a printed image out of its correct position.
MOLD-MADE
Originally, paper made by hand by the traditional method of paper molds, mostly from rag pulp. These days, mold-made papers are high-quality grades made on a cylinder mold machine, as opposed to a Fourdrinier or other type of machine, and may be made with or without deckle edges.
MULTIPLY BOARD MACHINE
A machine in which a number of plies of paper can be combined together in the wet state to manufacture thick cardboard.
