The thickness and density of the paper

Thickness and density Thickness indicates the degree of thinness of paper. It refers to the thickness of paper or paperboard directly measured between two measuring plates under a certain pressure, expressed in mm or μm. Generally, the thickness of the paper directly affects its opacity; the greater the thickness, the better the opacity. The uniformity of thickness is particularly important for paper. Uneven thickness can affect the decline of gloss and whiteness, as well as the instability of tone and color reproduction. Density refers to the weight of paper per unit volume, also known as density, which is calculated by dividing the basis weight by the thickness. Compactness is a physical indicator for measuring the density of paper structure. For paper of the same fiber type, the greater the compactness, the denser the paper; conversely, the looser the paper. The tightness of paper is directly proportional to its tensile strength.