Paper and Pulp

Porosity in paper is a measure of the extent to which a paper surface will allow the penetration of a gas or liquid, such as air or ink, through its surface. The nature of paper is such that the bonding of the paper fibers produces many tiny air passages throughout the paper, which can be completely encased in the paper, extend from the surface down into the interior of the paper, or penetrate completely through the sheet. The porosity of a type of paper is a function of the various stages of the paper-making process.

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