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Lexikon
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A • B • C • D • E • F • G • H • I • J • K • L • M
N • O • P • Q • R • S • T • U • V • W • X • Y • Z |
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Curl
Amount of curvature in a sheet of paper when laid on a flat surface. In ream, curl refers to the status before printing, while post image curl is the curvature caused by fusing and delivery operations.
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CMYK
Cyan, Magenta, Yellow and Black. These are the standard commercial printing colours and are also used by high-end digital presses, e.g. hp indigo presses or Xeikon technologies.
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CIE Whiteness
CIE Whiteness is a colorimetric property measured under specific conditions, a light source (illuminant D65) and an angle of 10º. This method is suitable for all white papers and measures the impression of whiteness. CIE whiteness takes into account the combination of the whiteness and the tint of the paper. Coated papers can be produced in a wide CIE whiteness range, from values of around 100 to 150.
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Cockling
Cockling appears as an inhomogeneous surface of the paper and is visible as a wavy or wrinkled structure. The main reasons for cockling are the varying humidity of the paper due to uneven drying, local basis weight variations and/or dimensional stability differences of both sides of the paper. Cockling can cause runability problems in copying machines, laser and ink jet printers, and sheet-fed offset printing presses.
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Cross and Machine Direction of Paper
Paper properties can be measured across the width of the paper machine as well as in the direction of travel through the paper machine. Paper properties measured in the cross direction (CD) differ significantly from those measured in the machine direction (MD). The differences are also influenced by the paper machine settings.
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Caliper
The caliper or thickness of a sheet of paper is measured in micrometers (µm). Using the examples above, newsprint has a caliper of about 70 µm and copy paper 100 µm. Matt coated paper generally has a higher caliper at the same basis weight than glossy coated fine papers. The caliper is the thickness of a sheet of paper.
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