An Automatic Vibroscope and How to Use It:Part 2: Measuring the Bending Modulus of Fibers and Strips by Reed-vibrating Method With Electrostatic Drive and Photo-Electric Detection
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概要
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An apparatus to determine the bending modulus of fibers and strips has been devised based on the reed-vibrating method. Specimens are driven to resonance by electrostatic force and their vibrations detected accurately by a photo-transistor, instead of microscopically.This electrcnic device is the features of Automatic Vibroscope which has already been developed by the authors to determine the denier of fibers. The new apparatus is Automatic Vibroscope slightly remodelled to suit the instrument for the reed-vibrating method. It makes possible detection under smaller amplitudes of vibration than those readable through a microscope in the conventional instrument. Therefore, the new apparatus reduces errors caused by departure from the ideal conditions of the theory, lessens distortions in frequency response curves and cuts down personal errors in measurement.The new apparatus can also be used for measurement of mass per unit length (denier) in samples of filamentous form. Therefore, even where the density of test pieces is unknown, its bending modulus is determinable easily by this apparatus alone.Some interesting and useful results have been obtained as to the characteristics of photoelectric detection and an interpretation of these behaviors is made. Measurements with our instrument have revealed anisotropy on the bending modulus of polyethylene film which was variously heat-treated, processed and cut in various angle for drawing direction into strips for use as specimens. The results obtained agree well with those of the other studies.
- 社団法人 日本繊維機械学会の論文