Energies 2021 , 14 , 3203
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( b )
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( d ) ( e ) Figure 11. The decreases in measured values for B-410 corrugated cardboard in: ( a ) BNT; ( b ) SST; ( c ) TST; ( d ) ECTand ( e ) THK2.
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( b )
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( d ) ( e ) Figure 12. The decreases in measured values for C-340 corrugated cardboard in: ( a ) BNT; ( b ) SST; ( c ) TST; ( d ) ECTand ( e ) THK2.
The relationship between crushing and decrease of parameter values was investigated by computing the coefficient of determination for each quantity, according to Equation (1). In Table 3, the values obtained are presented. Determining the crushing level from the stiffness tests is more precise when the average values from the MD and CD are used to compute the linear regression. This fact may be observed in Figure 14, in which the normalized parameter values were averaged from two directions and the crushing lines are shown. In Table 4, the corresponding coefficients of determination for the averaged values from two directions are presented.
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