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High Alpha Cellulose |
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A pure form of wood pulp, which has about the same longevity as cotton or other plant fibers. |
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High Bulk Paper |
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Paper stock that is comparatively thick in relation to its basis weight. |
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High Finish Paper |
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Machine-calendered newsprint. |
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High Key Halftone |
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A halftone that is made utilizing only the highlight tones down through the middle tones. |
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Hinged Ledger |
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Ledger paper characterized by a flexible section incorporated into the sheet. This is accomplished by removing some of the fiber on the paper machine, generally by suction. |
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Hog |
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A wooden paddle used to keep the fiber in suspension in the vat, later replaced by a mechanical paddle in the base of the vat. |
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Holdout |
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The ability of paper or board to resist surface liquid penetration. |
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Hollow |
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That space on the spine of a case bound book between the block of the book and the case binding. |
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Hood |
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A hood covering the paper machine drying section and designed for moist air removal. |
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Hot Ground Wood Pulp |
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Mechanical pulp produced by steam pretreated grinding logs. |
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Hot Melt |
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An adhesive used in the binding process, which requires heat for application. |
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Hot Pressed Paper |
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Smooth, glazed surface produced by pressing the paper through hot rollers after the formation of the sheet. |
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Hot Screening |
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Pulp cleaning at elevated temperature using pressure screens. |
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House Sheet |
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A term that refers to a paper that a printer keeps on hand in his shop. |
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Hue |
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The quality of color, which may be characterized by its position in the whole visible spectrum. |
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HWC |
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High Weight Coated - a printing paper grade. It's a coated paper produced from mechanical and chemical pulp for magazines, catalogs, and advertising materials. |
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Hydra Pulper |
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A vat with a special type of agitator used to rehydrate sheets of dry pulp, pulp up recycled papers, and mix and blend paper stock with water to create the desired slush of pulp stock. |
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Hydration |
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Any process of altering cellulose fibers to increase their ability to absorb water. In papermaking, the process of beating the pulp which increases its ability to hold water. |
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Hydration Refining |
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Mechanical treatment of papermaking pulp in a beater or refiner to achieve fiber flexibility and fibrillation. |
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Hydrogen Peroxide Bleaching |
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A bleaching method in which the pulp is bleached in alkaline environment with hydrogen peroxide. |
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Hygienic Tissue |
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Toilet tissue, facial wipes, paper towels and similar tissue products that disintegrate in water. |
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Hygroexpansivity |
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The expansion or contraction of paper due to a change in moisture content, usually caused by a change in the relative humidity. |
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Hygrometer |
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A device that measures the relative humidity of air. |
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Hygroscopic |
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Ability to absorb water vapor from the surrounding atmosphere. |
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Hymnal Paper |
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A strong, low-finish, lightweight opaque book paper for printing hymnals. |