COMBINED BOARD TESTS
These tests permit the evaluation of combined board quality and
whether established performance standards have been attained. NATS is also
equipped to benchmark coatings, including moisture vapour, water, oil and
grease-resistance coatings, for effectiveness, coating weights, etc.
Component ID (NATS Method)
In order to quote business accurately, boxmakers must know what they're up
against. Our in-house method provides precise identification of competitors'
liner and medium combinations.
Edge Crush Test "ECT" (TAPPI T811/T839)
This test, together with Mullen Burst strength, provide the basis for grade
designation in the field of corrugated packaging. When tested vertically,
samples of combined board can be used to predict the compression strength of the
Flat Crush (TAPPI T825)
The quality of the corrugating operation, including flute formation and medium
strength, can be identified through the use of this test.
Glue Line Evaluation (NATS Method)
The presence of water resistant adhesive ('WRA"), and the overall quality
of the corrugating adhesive application is evaluated through this in-house
Pin Adhesion (TAPPI T821)
By measuring the strength of adhesion between the corrugating medium and
linerboard used, this quantitative test provides an insight into the quality of
bonding in corrugated board.
Ply Separation (TAPPI T812)
This water-immersion test is commonly used to determine if the combined board
being considered is suitable for water-resistant applications.
L*A*B* Color Determination (TAPPI T524)
This colour test can be used to ascertain how closely coloured samples match
their target shades. Industry standards are used to define the match.
Ink Rub Resistance (TAPPI T830)
Both wet and dry rub resistance of inks and coatings are evaluated
qualitatively. Conversely, the resistance of unprinted surfaces to suffer ink
transfer can be measured.
MVTR--Moisture Vapour Transmission Rate (TAPPI T448)
The transmission of water vapour through coated or laminated structures is an
important consideration in water-barrier applications. MVTR ("Moisture
Vapour Transmission Rate) determinations provide critical information about