METHOD FOR PRODUCING PREPARATION FOR FIBER LENGTH MEASUREMENT, METHOD FOR PREPARING DISPERSION LIQUID FOR FIBER LENGTH MEASUREMENT, METHOD FOR MEASURING FIBER LENGTH, PREPARATION FOR FIBER LENGTH MEASUREMENT, FIBER LENGTH MEASUREMENT APPARATUS, AND CONTROL COMPUTER PROGRAM FOR FIBER LENGTH MEASUREMENT APPARATUS

摘要

A method for producing a preparation for fiber length measurement includes: a preliminary dispersion process of adding fibers and a dispersion medium with a viscosity of 500 Pa·s to 10,000 Pa·s to a sealable container so as to give a concentration of the fibers of 0.1% by mass or less and shaking the container to prepare a preliminary dispersion liquid; a dispensing process of dispensing part of the preliminary dispersion liquid to another sealable container; a dilution process of adding the dispersion medium to the dispensed preliminary dispersion liquid so as to give a concentration of the fibers of 0.005% by mass or less and shaking the container to prepare a dispersion liquid for measuring fiber length; and a casting process of spreading part of the dispersion liquid for measuring fiber length onto a base having light transparency.