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2022

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What are the factors that affect the stiffness of paper board? Test method for stiffness of paper board


The importance of paper board stiffness: for box board paper and white board paper, stiffness is a basic performance index. Paper stiffness is a very important indicator, which directly affects the size of the crease stiffness (another influencing factor is 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, and the finished product is difficult to form. Packaging paper has requirements for stiffness. Different quantitative paper stiffness is different, generally proportional to the square of 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 the paperboard are the most basic factors affecting the stiffness of the paperboard or paper. When the thickness is constant, the stiffness increases with the increase of tightness. When the weight is constant, it increases slightly with the increase of tightness and then decreases slightly, but the general trend is a net increase. Test method for stiffness of paper and board The measurement method of stiffness includes the bending strength of the fixed and unfixed angle test sample, and the strength change of the sample is measured by free bending. Some test methods have both. Clark and Graml are commonly used to measure the stiffness of paper.

影响纸张纸板挺度的因素有哪些?纸张纸板挺度的测试方法

The importance of paper board stiffness

For box board paper and white board paper, stiffness is a basic performance index.
Paper stiffness is a very important indicator, which directly affects the size of the crease stiffness (another influencing factor is 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, and the finished product is difficult to form.

Packaging paper has requirements for stiffness. Different quantitative paper stiffness is different, generally proportional to the square of 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 the paperboard are the most basic factors affecting the stiffness of the paperboard or paper. When the thickness is constant, the stiffness increases with the increase of tightness. When the weight is constant, it increases slightly with the increase of tightness and then decreases slightly, but the general trend is a net increase.
Test method for stiffness of paper and board
The measurement method of stiffness includes the bending strength of the fixed and unfixed angle test sample, and the strength change of the sample is measured by free bending. Some test methods have both. Clark and Graml are commonly used to measure the stiffness of paper.

 

 

Keywords: printing machine