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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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Feathering
This occurs with inkjet inks which have a low viscosity, mix and spread over the paper if the paper is not optimised for inkjet printing.
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Formation
This term describes how evenly the fibres are distributed in the paper, and this can be easily seen by holding the paper against the light. The better the formation, the better the printability, opacity and dimensional stability of the paper. Formation can be evaluated visually or measured as variations in mass distribution.
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Fibre Orientation
In handmade paper the orientation of the fibres is random, whereas in machine-made paper their alignment is more in the machine or longitudinal direction than in the cross direction, giving the paper different stiffness and strength characteristics. The more uniform the fibre orientation is across the profile (or paper sheet), the better the paper will perform in printing processes exposed to heat, such as laser printing. If the main fibre orientation is not exactly aligned with the paper, the printed sheets will tend to produce leaning stacks after laser printing. The fibre orientation is measured by means of light transmitted through the fibres. They deflect some of the light towards themselves and the originally circular light spot becomes oval in shape.
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