Dictionary

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Drag

"A term used to describe the speed difference between the stock jet and wire. The wire travels faster than the stock and ""drags"" it."

Drainage

The flow of water through the forming fabric and from the stock as the sheet is formed on the fourdrinier of former.

Draw

"(1) The difference in speed between two sections of the machine used to ""draw"" or pull the sheet from one section to the next. (2) In trimming paper, the displacement of the cut sheet by the thickness of the knife; this is a common cause of inaccurately cut paper. (3) The tension applied to the paper between sections of a paper machine, such as the press section or dryer section."

Drier Hood

A covering over the whole or part of the drier section of the paper machine or coating unit which serves to collect the hot moisture-laden air from the drying process and exhaust it through suitable fans and duct work. It is designed to control air flow for uniform and rapid drying.

Drive

The system of motors and controls used to turn the machine sections.

Drum Roll

The rolls on the winder bed also called bed rolls.

Dry End

(1) The area of the paper machine from the first dryer can to the winder. (2) The part of the paper machine where the paper is dried.

Dryer

"(1) The steam-heated metal cylinder or ""can"" which the paper passes over to be dried. (2) The steam-heated cylinders over which paper in the web is passed to be dried."

Duplicating Paper

(1) Generally speaking, any paper that is designed for the reproduction of multiple copies by processes such as Mimeograph, spirit duplicating, Ozalid, etc. (2) Specifically applied to paper for copies produced by transfer of small portions of aniline ink from a master copy to many sheets of copy paper. In the gelatine process, the ink is held by a gelatine blanket, which gives up a little of the ink to paper pressed in close contact with the blanket. In the liquid process, or spirit process duplicating, each sheet of copy paper is moistened with a small amount of spirit (alcohol) which comes in contact with the master (paper) and dissolves a little of the dye to make a copy. Paper for spirit duplicating must have a smooth surface and controlled absorbency to pick up just the right amount of spirit.

Dye

Chemicals used to import a certain shade of color to the paper.

E.P.A.

Environmental Protection Agency. An agency created by Congress to maintain control of air and water pollution, and to establish standards of air and water quality.

Effluent

A liquid discharged from a source, whether treated or not.

Embossed

A finish imparted on paper by means of raised or depressed engravings on steel rolls so as to leave a visible surface design on the paper.

Emulsification

The process of dispersing one liquid in another when the two liquids normally do not mix.

English Finish

A finish between machine finish and supercalendered in the degree of smoothness.

Envelope Paper

A term used to describe certain grades of paper commonly used for manufacturing envelopes.

Equalizing Chamber

A chamber on the head box where the stock is mixed after the tube bundle to ensure a homogeneous mixture.

Equivalent Weights Of Paper

Indicates equivalent weights of paper of different sizes and different ream weights but of identical basis or substance weights, i.e., 25 x 38- 50 is equivalent in substance to 32 x 44- 74.

Erasability

That property of a sheet which permits writing on the sheet to be removed by erasure and which resists erosion by erasure. After erasure, the sheet should present a satisfactory appearance on the erased area and permit rewriting on the erased area.

Erosion

The gradual wearing away of metal from the lining of tanks and piping caused by turbulence of the liquid being pumped through the system.