Method for evaluating interfiber bonded area of high-yield pulp by using confocal laser scanning microscope (CLSM)

Abstract

The invention relates to a method for evaluating the interfiber bonded area of high-yield pulp with CLSM as a main tool. The method comprises the following main steps: with commercial high-yield pulp as a raw material, subjecting fibrous material of the pulp to soaking, latency elimination, screening and other early-stage pretreatment; then carrying out fluorescent dyeing on fibers and building a fiber bonding model by using related tools; scanning the fiber bonding model by using the optical sectioning technology of CLSM and accurately positioning the interfiber bonded area by regulating CLSM scanning parameters; and acquiring the focal plane image of the interfiber bonded area and calculating the actual area of the bonded area so as to evaluate the interfiber bonded area of the high-yield pulp. The method provided by the invention does not need the procedures of preparation of handsheets from the high-yield pulp and ultrathin slicing of the handsheets, is simple to operate, easy to implement and applicable to evaluation of the interfiber bonded area of all types of high-yield pulp, and has good adaptability.

Description

technical field [0001] The invention belongs to the field of pulping and papermaking, and relates to a measuring method in pulping and papermaking, in particular to a method for evaluating the bonding area between high-yield pulp fibers by using CLSM. Background technique [0002] The high-yield pulping process has gradually attracted attention due to its advantages such as lower fiber cost and environmental pollution load, and has developed very rapidly. Bleached chemical thermomechanical pulp (BCTMP), alkaline peroxide mechanical pulp (APMP) and mildly pretreated alkaline peroxide mechanical pulp (P-RC APMP) are collectively referred to as high Yield pulp (High-Yield Pulp, HYP for short). In recent years, high-quality high-yield pulp has been used to replace some hardwood kraft pulp due to its unique properties, and has been applied in a variety of high value-added paper grades. Compared with the corresponding bleached chemical pulp, high-yield pulp has higher bulk, opac...

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Problems solved by technology

[0012] 1), Groups 1, 2, 3 and 4 are limited to laboratory research on the bonding area between chemical pulp fibers, focusing on the basic theory of chemical pulp bonding properties, and do not focus on high-yield pulp fibers ( The performance of high-yield pulp fibers is very different from that of chemical pulp fibers, such as: fiber shape, surface morphology, deformation properties, etc.) To explore the feasibility and accuracy of testing the bonding area between fibers in the laboratory, let alone combine the testing methods used The instrument and operating parameters introduce the possible problems and solutions of the detection method in actual operation

[0013] 2), Documents in groups 1 and 5 mainly introduce the laboratory detection method of the relative bonding area RBA between pulp fibers, but do not detect the actual bonding area between pulp fibers; although the literature in groups 2, 3 and 4 introduces the use of fluorescence Microscope, polarized light microscope and ultra-thin section technology detect the actual bonding area between fibers, but mainly focus on theoretically discussing the method of judging the actual bonding area between chemical pulp fibers, and do not discuss high-yield pulp fibers

[0014] 3) There are significant differences between high-yield pulp fibers and chemical pulp fibers in terms of fiber morphology, surface morphology and deformation properties, resulting in poorer bonding properties between fibers than chemical pulp fibers

These differences will cause the fiber-to-fiber bonding area detection method discussed for chemical pulp fibers to be inapplicable to high-yield pulp fibers

None of the previous six groups of documents combined the high-yield pulp fibers to specifically discuss the detection method of the actual bonding area between the fibers.

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