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Industry Comparison
Dollar for dollar, tonne for
tonne, Strathcona produces a 100%
recycled clay coated boxboard with superior strength, greater brightness
and better plybond, offering a true
substrate alternative for our customers.
Strathcona is a member of the Recycled
Paperboard Technical Association (RPTA).
This independent association tests recycled boxboard from over 50 mills in North and South America.
The results benchmark Strathcona to
the industry averages and demonstrate
the board properties categorized: |
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Click on caliper below to view comparison chart |
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Definitions
Basis Weight
– A measure of the weight of boxboard
in a given area. The greater the basis weight
the stronger the boxboard. This is expressed either as
grams per square meter (metric) or pounds
per one thousand square feet (imperial).
Caliper –
A measure of boxboard thickness. It is expressed
as microns (metric) or points (imperial).
Density –
A measure of the basis weight per single
caliper unit. During printing, higher density
boxboard will have improved colour-to-colour
register as the sheet does not stretch when
passing through press nip points. It may
also permit the use of a more cost-effective
lower caliper boxboard.
Machine
Direction (MD) Stiffness – A measure
of the force required to bend the sheet
in the same orientation as the paper machine
flow. MD stiffness is an important indicator
of boxboard strength as it provides increased
boxboard rigidity and fill line speeds for
many manufacturers. It is expressed as
milliNewton
meters (metric) or Taber units (imperial).
Cross
Direction (CD) Stiffness – A measure
of the force required to bend the sheet
in the cross direction orientation of the
paper machine flow. When fed grain long
during printing, a lower CD stiffness is
advantageous. The sheets will contour around the cylinder, resulting in less scuffing and marking on the trailing edge of the
sheet. In addition faster press speeds can
be achieved. Expressed as milliNewton meters
(metric) or Taber units (imperial).
MD/CD
Ratio – A composite measure of
boxboard performance based on strength characteristics.
The higher the ratio, the better the on
press and fill line performance of the board.
Smoothness – A measure of the surface smoothness
characteristics of the boxboard expressed
as micrometers. A lower result indicates
a smoother sheet. A smoother sheet surface
provides for enhanced colour laydown and
improved press printing efficiency.
Brightness – A measure of the light reflected from the clay surface of the boxboard.
The higher the brightness measurement, the
more vibrant and precise the colour reproduction
will be.
Plybond –
A measure of the internal bond strength
of the individual plies of boxboard. A higher
result indicates higher strength. High plybond
strength will ensure that the boxboard will
not come apart during converting and will
also help to ensure that the finished carton
maintains its integrity throughout the supply
chain. Expressed as kilograms per square centimetre
(metric) or pounds per square
inch (imperial). |
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