Case study of the out-of-plane shear strength measurement of paper machine clothing

Tomi Hakala, Ali Harlin

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    The press section is essential for paper machine efficiency, and its runnability is connected to the press felt properties. We studied the out-of-plane shear behavior of press felt specimens in both dry and wet conditions. Our strength tester laboratory set-up was modified to simulate pressure pulses in mechanical dewatering in the paper machine. The test arrangement used a moving upper jaw to generate dynamic stress, gluing and a watering system. Draw speeds, length of displacement, number of tensile cycles, and glue type were standardized during the preliminary work. After tests, 45 load-and-unload cycles were plotted in curves, and shear strength and modulus values were calculated. Results show that hysteresis and non-homogenous behavior, drop in maximum forces, and negative load values in the unload direction are connected to the design, density, wetness, fiber entanglement, and intersections of the specimen. The results benefit the work of wet press modeling.
    Original languageEnglish
    Pages (from-to)2066-2080
    Number of pages15
    JournalTextile Reseach Journal
    Volume80
    Issue number19
    DOIs
    Publication statusPublished - 2010
    MoE publication typeA1 Journal article-refereed

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