The Science of Corrugated Web Interactive 17.03.25 - Flipbook - Page 5
Board Grade
Analysis Limitations
Once the full board analysis process has taken place it is dif昀椀cult to determine exact paper type, e.g.
test-liner 1,2,3. This is demonstrated by differences in paper attributes, which have a signi昀椀cant effect
on the board and box performance. The following tables illustrate the resulting differences between
suppliers selling the same board, with paper from different paper sources.
% Diff
ECT
BCT
% Diff
ECT
BCT
Supplier 1
Supplier 2
0%
~-1.5%
0%
~-1.5%
Supplier 3
~-2.7%
~-2.7%
Supplier 1
Supplier 2
Supplier 3
0%
~-2%
~-2.9%
0%
~-2%
~-2.9%
*The above are approximate hypothetical 昀椀gures, not based on tested values or actual results.
Due to the varying paper sourcing methods of board manufacturers, the results from the board
analysis method will not necessarily match the same board grade ran by another board manufacturer.
A more reliable method:
Gather a minimum of 12 cases that can be performance tested to assist the board manufacturer with
suggesting equivalent an board grade.
Do you have a board sample
you would like testing?
Yes
Based on matching paper
performance or weights?
Paper weights
Performance
Perform ECT and BCT tests on
a bundle of cases.
No
Does the same paper weight
offer the same performance?
Yes
Use theoretical ECT & BCTs to
昀椀nd an equivalent strength see
pages 6 & 7
: www.allpack.uk.com
Determine closest grade
based on paper types/weights
based on the board analysis
method.
*sales@allpack.uk.com
Refer to Board Analysis
limitations.
5
( 01543 396 700
