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A test (using a special ink or dyed oil provided by K & N Laboratories Inc.) to evaluate the absorption of ink by a paper surface. The paper surface is smeared with an excess of the K & N ink and after a specified time, the unabsorbed ink is wiped off the sheet. The depth of color remaining (absorbed ink) is measured, usually with a reflectance instrument.

A white clay which in its beneficiated condition, is used as an opacifier and to promote paper smoothness, in the paper machine furnish, and as a pigment in coatings.

The bottom roll in a calender stack, usually the largest diameter in the stack and the only driven roll in the stack.

A delicate printed impression that is just heavy enough to be seen. A very light printing impression, with just enough pressure to create an image and transfer of ink to the paper; a term used to signify ideal impression pressure when printing by the letterpress processor when printing pressure sensitive carbonless papers.

Relating to the sulfate pulping process, it has many advantages which account for its universal usage. The Kraft process can pulp almost every available wood species. It produces a strong white pulp needed for operating today's high-speed paper machines and for performance on high-speed presses and converting equipment. Bleached kraft is used for printing papers.
Also known as the sulfate process; a process and the product resulting from the pulping of wood, using a sodium hydroxide (alkaline) and sodium sulfide solution, under conditions of high temperature and pressure; a "strong" pulp. Kraft is the most widely used wood, chemical pulping process; see soda for the less widely used alternative alkaline pulping process. Kraft also refers to the strong brown paper used for packaging, like brown grocery bags.

High-strength paper made from woodpulp produced by the sulfate pulping process. It may be bleached or unbleached, and produces a strong paper which is used for wrapping and packaging.

A fibrous material used in pulp, paper and paperboard manufacturing produced by chemically reducing wood chips into their component parts by cooking in a vessel under pressure using an alkaline cooking liquor.

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