(H) HTML (Hypertext Mark-up Language)
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The most common formatting code added to text documents turning them into hypertext documents.
(H) HWC
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High weight coated. A printing paper grade.
(H) Halftone
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The representation of tonal gradation by an image composed of dots of varying sizes, the centres of which are equidistant.
(H) Hard pulp
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Chemical pulp with high lignin content.
(H) Hard sized
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Paper with a high degree of sizing.
(H) Hardwood pulp
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Pulp obtained from the wood of hardwood trees by various processes. The fibres are generally shorter than those of softwood pulp.
(H) Head box
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see Flow box.
(H) Hickey
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A spot on a printed sheet caused by dust, lint or ink imperfections; particularly noticeable on solids and halftones.
(H) Hold out
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Resistance of a paper to ink absorption.
(H) Hologram
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A device created by recording the wave patterns and diffraction of light. Used mainly for security purposes.
(H) Hood
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A hood covering the papermachine drying section and designed for moist air removal. It also helps to reduce the level of sound in the paper mill.
(H) Hybrid technology
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Joining together of different technologies in one unit, such as combining offset and digital in one machine.
(H) Hydrapulper
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Large circular metal tank in which dry pulp is mixed with water and other ingredients in the first stage of the papermaking process.
(H) Hydrogen peroxide bleaching Open info
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A method in which pulp is bleached in an alkaline environment with hydrogen peroxide, sometimes using oxygen reinforcement. The method considerably reduces the need for chlorine containing chemicals in the final bleaching of chemical pulps.
(H) Hygienic tissue
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Toilet tissue, facial wipes, paper towels and similar absorbent tissue products that disintegrate in water.
