C is for Caliper
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C is for CALIPER
Caliper is the thickness of a single sheet of paper, measured in thousandths of an inch, mils or points. Caliper is measured using a micrometer, a device which measures minute thicknesses of paper by applying a static load for a set period of time. Consistency of caliper throughout a manufactured roll of paper is important. Increases or decreases in caliper can affect the extent to which the printing plate or blanket contacts the paper and affects printability and runnability. The thickness of a paper itself varies according to the basis weight desired or end-use considerations. Caliper can be reduced or increased at a variety of stages in the papermaking process. The amount of pulp, dyes and sizing deposited on the wet end of the paper machine can be reduced or increased. The process of calendaring (rendering surface smoothness) can reduce the thickness of the paper.