Method for predicting paper tensile strength based on mechanical pulp fiber properties

Abstract

The invention relates to a method for predicting paper tensile strength based on mechanical pulp fiber properties and belongs to the technical field of pulping and papermaking. On the basis of a classic page model, the water retention value WRV of pulp is used for replacing the fiber relative bonded area RBA which is hard to test, and a mathematical model suitable for evaluating the relation between the mechanical pulp fiber properties and the paper tensile strength is established. Specifically, mechanical pulp fibers are used as samples, and mechanical pulp plates made of different varieties of trees (polar and maple) are subjected to defibering and PFI pulping; assuming that the model contains the paper tensile index T, the fiber length weighted lw, the fiber curling index, the shear bond strength b between the fibers and the water retention value WRV of the pulp, the expression of a paper tensile strength model is shown in the description, wherein a is constant. The method is completely based on the morphological parameters of the mechanical pulp fibers, and efficient prediction of the paper tensile strength can be realized by testing the fiber morphological parameters.

Description

technical field [0001] The invention belongs to the technical field of pulping and papermaking, and relates to a method for predicting the tensile strength of paper sheets based on the characteristics of mechanical pulp fibers. Background technique [0002] Effective utilization of wood fiber raw materials is an important issue in the development of my country's pulp and paper industry. Among the various properties of paper (optical properties, strength properties, thermal properties, etc.), the strength property determines the application field of the paper and is the cornerstone of other properties of the paper. Only when the paper has a certain strength can people further optimize it. Other properties of the paper sheet, thereby expanding the application range of the paper sheet. However, the performance of paper is determined by fiber properties (length, thickness, slenderness ratio, bonding strength between fibers, relative bonding area between fibers). [0003] Based...

AI Technical Summary

Problems solved by technology

The Page model not only considers the influence of the basic shape of the fiber on the tensile strength of the paper, but also involves the influence of the zero-distance tensile strength of the paper on the tensile strength of the paper. However, some parameters in the model are difficult to pass through the experimental equipment. Direct acquisition, such as the relative bonding area between fibers, the shear bonding strength between fibers

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