Paper
and Board
These can be either coated or un-coated. Coated papers and boards
have a clay coating applied to one or both sides during the
papermaking process to provide a smooth (often glossy), non-absorbent
surface.
Un-coated
papers do not provide the sharpness of image achieved when
printing on a coated stock. Dots of inks will tend to sit
on the surface of a coated stock and retain their original
shape, whereas those on un-coated stock will tend to soak
in and alter shape ("Dot gain").
Papers
are thin, single layered stocks. cards or boards are thicker,
and usually multi-layered, whilst fluted boards are constructed
by sandwiching a layer of corrugated card between two outer
layers of paper or board - providing a strong, light weight
stock useful for constructing displays.
Measurements:
Sheet
size
- usually
measured in millimetres but occasionally still referred to
by traditional imperial measurements - ie 60 x 40 (inches).
Thickness
- industry standard is "microns" or 1000ths of a millimetre,
the abbreviation for which is ums - eg. 450ums.
Weight
- industry standard is Grams per Square Metre (abbreviation
GSM) which refers to the weight in grams of a 1 metre by 1
metre piece of the stock.
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