The importance of paper and cardboard stiffness
For boxboard and whiteboard, stiffness is a basic performance indicator.
Paper stiffness is a very important indicator, which directly affects the size of the crease stiffness (another influencing factor is the die-cutting pressure), thus affecting the finished product forming. The stiffness is small, the finished product is easy to crush and warp; the stiffness is large, the finished product is difficult to form.
The stiffness of packaging paper is required. The stiffness of different amounts of paper is different. It is generally proportional to the square of the thickness. The thicker the cardboard, the higher the stiffness.
Factors affecting bending stiffness
There are many factors that affect stiffness. The thickness and elastic modulus of cardboard are the most basic factors affecting the stiffness of cardboard or paper. When the thickness is constant, the stiffness increases as the tightness increases. When the weight is constant, it slightly rises with the increase of tightness and then decreases slightly, but the general trend is a net increase.
Test method for stiffness of paper board
The stiffness measurement methods include fixed and non-fixed angle test specimens. The bending strength of the test specimen is freely bent to measure its strength change. Some test methods have both. The stiffness of measuring paper is usually used by Clark and Greer method.
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