Paper Standards Measur Umschlag - Sappi Mobile

ll Paper Specification
A paper specification is a list of characteristics with appropriate
measured values, which the paper has to fulfill. The
measured values are indicated with their tolerances. A specification
is necessary, since this shows the requirements of
the customer and forms the basis, that always the same
paper is supplied. In order to come to a specification, one
must know the intended purpose and the requirements of
the paper. Discussions with the customer or consumer are
the correct way to co-ordinate the requirements of the
paper and the possibilities in paper production.
Basis weight ISO 536
The weight in g/m 2 is understood by the basis weight of a
paper under conditioned circumstances. The entire mass is
the sum of fibrous materials, fillers, process materials and
water.
Thickness / Caliper ISO 534
The thickness of a paper is measured between two even
plates, which are adjustable with a defined pressure. Because
of the compressibility and the inhomogeneity several
measurements have to be carried out and the results averaged.
The thickness of a paper is dependent on grammage
and specific volume.
Specific volume ISO 534
The thickness is expressed in micrometers (µm). To compare
the thickness of papers with different basis weights, the
specific volume is used. This is the thickness to which the
basis weight of 100 g/m 2 refers. This calculation is carried
out according to the formula:
Thickness (µm) divided by the basis weight is the specific
volume (cm 3 /g).
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The picture above shows the most important optical and physical characteristics,
in so-called Datasheets are listed. These can request or with your personal
partner receive you at any time in the Internet.
Relative humidity Tappi 502
The relative humidity indicates how many percent of the maximum
possible water vapour portion, at a certain temperature
is actually in the air (i.e. between the sheets of a stack or the
windings of a reel).
L&W Micrometer