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

A technology of tensile strength and fiber characteristics, applied in paper testing, measuring devices, special data processing applications, etc., can solve problems such as acquisition and difficult parameters

Inactive Publication Date: 2016-08-17
ZHEJIANG SCI-TECH UNIV
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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 strengt

Method used

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

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Embodiment

[0013] Weigh 75g of mechanical pulp board (dry: 80%), use a thermal deflagging machine for thermal deflaking, and then perform PFI refining, and the refining speed is 1000R, 1500R, 3500R. Determine the water retention value of the slurry. Cut a sample with a width of 15 mm, and after 24 hours of constant temperature and humidity treatment, use the L&W tensile strength tester to test the tensile strength, and then use the formula to calculate the tensile index T of the paper sheet, and use the TMI interlayer bonding instrument to measure the bond strength between the paper sheets. test. The fiber quality analyzer is used to test the fiber shape, the weight-average length of the fiber is measured, and the fiber crimp index C calculated based on the weight-average fiber length w . Substitute the sheet tensile index, the shear bonding strength between fibers, the water retention value of the pulp, the weight-average length of the fibers, and the curl index of the fibers into the...

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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...

Claims

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Application Information

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IPC IPC(8): G06F19/00G01N33/34
CPCG16Z99/00G01N33/346
Inventor 唐艳军张馨琪杨淑杰
Owner ZHEJIANG SCI-TECH UNIV
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