Substance -
Substance, Grammage or basis weight is an important parameter
for comparison purpose. It is an indication of the amount
of pulp that goes into forming one unit area of the paper.
Its importance is brought to fore when comparing the other
test results. It is a useful benchmark.
Sample Size : 50 cm x 50 cm
Moisture - Strength properties
of kraft paper are directly related to moisture levels in
the paper / board. Generally, higher the moisture level, lower
the strength.
Sample Size : 50 cm x 50 cm
Caliper - Another major
to amount of pulp that goes into one unit area of paper. It
is a useful benchmark.
Sample Size : 50 cm x 50 cm
pH Value - This is significant
for adhesive as well as ink compatibility with paper and hence,
useful major for convertors.
Sample Size : Paper 50 cm x 50 cm, Liquid 200 ml
Burst Factor - Bursting
strength is the most widely used strength parameter for kraft
paper. It is believed to be indicative of the resistance of
paper of Bursting Forces found in transit or in storage. Burst
Factor equals Bursting Strength divided by grammage. Thus,
Burst Factor or "BF" is a useful indicator of strength
property regardless of substance.
Sample Size : 50 cm x 50 cm
Cobb Value - A measure of
how much water the paper will absorb in given time, say, one
minute. This property has relevance to adhesive pick up during
converting as also extent of loss of strength due to high
humidity.
Sample Size : 50 cm x 50 cm
Ring Crush - Ring Crush
of kraft paper is indicative of how much edge crush and then,
how much compression strength to expect from converted board.
This is one of the most important areas where the data is
non existent.
Sample Size : 50 cm x 50 cm
Tear Factor - A measure
of how easy or difficult it is to tear the paper after the
initial has occurred. This property has relevance to the puncture
resistance of converted board.
Sample Size : 50 cm x 50 cm
Concora Medium Test (CMT) -
Evaluates the ability of corrugating medium to contribute
the compression strength of corrugated box.
Sample Size : 50 cm x 50 cm
Edge Crush Value - Edge
Crush Value of corrugated board gives an indication Box Compression
Strength. Thus, it is an important test property of corrugated
board to check during box manufacturing.
Sample Size : 50 cm x 50 cm
Box Compression Strength -
This is replacing Bursting Strength as the most important
test for corrugated boxes. As the stacking height increases
and automated handling replaces manual method, Compression
Strength becomes more relevant.
Sample Size : 3 Pcs. minimum of each size without folding the box
Puncture Resistance - Reflects
the strength of paper as well as converting efficiencies.
It is more relevant in case of 5-ply and 7-ply. It correlates
better with the resistance of corrugated boards ot external
forces.
Sample Size : 50 cm x 50 cm
Corrosion of Stitching Wires -
Rusted pins are not acceptable for aesthetic reasons, especially
where box has multi-colour printing, and for hygienic reasons
where boxes are used to pack food items. This test indicates
the level of resistance to corrosion.
Sample Size : 50 cm x 50 cm
Viscosity of Adhesive - This is critical
in assessing its bonding strength.
Sample Size : 200 ml
Tensile Strength and Breaking Length
- Tensile Strength is the force per unit width parallel
to the plane of the sheet, that is required to produce failure
in a specimen of specified width and length under specified
condition of loading.
The strength of the paper is also expressed in terms of breaking length, i.e. a length pf paper that can be supported by one end without breaking.
Sample Size : 50 cm x 50 cm
Flat Crush Test - Flat Crush
Test of Corrugated Fibre Board ia a measure of the resistance
of the flutes in a corrugated board to a crushing force applied
perpendicular to the surface of the board.
Sample Size : 50 cm x 50 cm |