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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Shear strength
Gluing
Glues
Dewatering
Hysteresis
Elastic moduli
Fibers
Direction compound

Cite this

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title = "Case study of the out-of-plane shear strength measurement of paper machine clothing",
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.",
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Case study of the out-of-plane shear strength measurement of paper machine clothing. / Hakala, Tomi; Harlin, Ali.

In: Textile Reseach Journal, Vol. 80, No. 19, 2010, p. 2066-2080.

Research output: Contribution to journalArticleScientificpeer-review

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AB - 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.

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