Permanent, all-or-nothing control of the material, manufactured cardboard and packaging is supported by employees of a modern equipped strength analysis laboratory who very thoroughly conduct their investigation.
Paper weight of a sheet of corrugated cardboard with an area of 1m2. It is given in [g/m2]. An area of a sample sheet for determination should equal respectively not less than 100 cm2 and not more than 1000 cm2. It is one of the basic values which characterizes parameters of paper product (including corrugated cardboard). Tolerance range amounts to +/- 4%. Nowadays, when much more various kinds of paper are used in order to determine the quality of particular cardboard it is required to complete cardboard specification with also other parameters, such as e.g. ECT or other.
The test which allows to check the level of water absorption by paper or cardboard. Mass of water absorbed in particular time by 1m2 of paper or cardboard in specific conditions equals water absorption expressed in Cobb units.
ISO 535 , TAPPI T441
Bursting determines maximum pressure produced by hydraulic system, pushing out the elastic round membrane rigidly clamped on the edge of the sample, which causes its burst. Resistance to bursting is expressed in [kPa].
PN-EN ISO 2759:2005
The test determines the value of force relative to the length of the edge of cardboard sample acting parallel to waves direction and causing the sample crush. ECT test is the measure of resistance to the force parallel to waves. These forces are crucial while piling the boxes. Basically, the type of flute does not have impact on ECT.
PN-EN ISO 3037
The test is based on exerting pressure on the outside flute layers of the corrugated cardboard causing permanent flute crush. The value of that parameter depends on the flute type and the quality of paper used for the wavy layer. Measurement is not sensitive to cardboard thickness changes caused by processing. It does not have direct impact on BCT.
It determines the moment of resistance per unit of width the corrugated board shows while being bent within the limits of elastic deformation. It indicates with great precision even the slightest crush of cardboard which is not possible to determine by means of other methods.
Perforation resistance. The determination of this parameter is based on measuring energy required to perform a complete perforation of cardboard with the head which should be a pyramid with the base of a right-angled triangle. The method is applied for all kinds of corrugated board. Perforation resistance is expressed in [J].
BCT (Box Crush Test) The test determines packaging resistance to compression. It is expressed through the value of force acting directly on a box during the crush which causes its damage or deformation. The value of BCT depends directly on ECT.
The test to determine the optimum force to open a package by tearing the perforation. The parameter is determined when a device shaped like a human hand is placed in the opening of the cardboard box to measure the actual load that will be applied at use. The force measured in N will help optimise the applied perforation lines on the punch to the applied paper compositions.