Glossary of Terms

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Packaging: The paper and board used for wrapping or packing goods.
Paper: Homogenous sheet of felted cellulose fibers, bound together by interweaving and by the use of bonding agents and made in a variety of types.
Paperstock: Water slurry of various pulp fibers, dyes, additives and chemicals pumped to the paper machine for formation into sheets.
Papeterie: A high-grade, soft paper used for personal stationery.
Patent Coated: Paperboard made and lined with white or colored fibers on a multi-cylinder machine, possessing a high-surface finish suitable for use in making cartons.
Perfect: A term used to describe the binding process where the signatures of a book are held together by a flexible adhesive.
Perfecting Press: A printing press that prints on both sides of the page in a single pass.
Picking: Pulling out paper fibers from the paper surface during printing. It occurs when the pulling force (tack) of the ink is greater than the strength of the paper.
Pigment: Insoluble mineral or organic powder used to coat or fill paper. Many pigments are mineral and inorganic compounds used in coating to give smooth surface and opacity.
Ply: The number of pieces of paper that make up a multi-layered, pasted or multi-cylinder-formed paperboard.
Porosity: A measurement of the ability of paper to allow fluids to pass through paper and paperboard, which is an important factor in ink penetration.
Preprint: Linerboard that was printed and rewound prior to the manufacture of combined board. It's used to make corrugated boxes with high graphic quality.
Printability: Ease with which paper can be printed to high-quality standards with the least amount of spoilage.
Prohibitive Materials:   As published by the Institute of Scrap Recycling Industries, Inc., any materials which by their presence in a packing of paper stock, in excess of the amount allowed, will make the packaging unusable as the grade specified. Additionally, this includes any materials that may be damaging to equipment.
Pulp: Fibrous material produced by mechanically or chemically reducing woody plants to their component parts from which pulp, paper and paperboard sheets are formed after proper treatment.
Pulper: A device composed of a cylindrical vat in which a rotor separates the fibers and suspends them in water.



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