Effects of folding numbers, scoring depth and bending velocity on bending-moment relaxation of creased paperboard

This work deals with the time-dependent creasing characteristics of coated paperboard. The correlation between the bending strength (resistance) and time-dependent problems on the actual processing phenomenon has not been sufficiently discussed in the past. In this study, therefore, a prototype test...

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Autores principales:	Shigeru NAGASAWA, Shinya OZAWA, Yasushi FUKUZAWA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2014
Materias:	bending moment creasing shear relaxation paperboard Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/eb55a4d91812472499a6a09675a61326
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spelling	oai:doaj.org-article:eb55a4d91812472499a6a09675a613262021-11-26T06:16:58ZEffects of folding numbers, scoring depth and bending velocity on bending-moment relaxation of creased paperboard2187-974510.1299/mej.14-00346https://doaj.org/article/eb55a4d91812472499a6a09675a613262014-12-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/2/1/2_14-00346/_pdf/-char/enhttps://doaj.org/toc/2187-9745This work deals with the time-dependent creasing characteristics of coated paperboard. The correlation between the bending strength (resistance) and time-dependent problems on the actual processing phenomenon has not been sufficiently discussed in the past. In this study, therefore, a prototype testing apparatus has been applied to investigate about the dynamic relaxation of bending moment. In order to reveal the relaxation characteristics of the bending resistance during the folding motion from an initial position up to a specified tracking angle, a white-coated paperboard of 0.3 mm thickness was scored with a creasing rule and then the bending test was carried out by varying the number of folding repetitions. Through this work, the followings were obtained: (1) The relaxation of the bending resistance was characterized by an exponential coefficient which was independent to the nominal shear strain while it varied with respect to the number of folding repetitions; (2) The relaxation coefficients of logarithmic approximation with the elapsed time are linearly characterized by the nominal shear strain and the number of folding repetitions; (3) The relaxation depends on the bending velocity.Shigeru NAGASAWAShinya OZAWAYasushi FUKUZAWAThe Japan Society of Mechanical Engineersarticlebending momentcreasingshearrelaxationpaperboardMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 2, Iss 1, Pp 14-00346-14-00346 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	bending moment creasing shear relaxation paperboard Mechanical engineering and machinery TJ1-1570
spellingShingle	bending moment creasing shear relaxation paperboard Mechanical engineering and machinery TJ1-1570 Shigeru NAGASAWA Shinya OZAWA Yasushi FUKUZAWA Effects of folding numbers, scoring depth and bending velocity on bending-moment relaxation of creased paperboard
description	This work deals with the time-dependent creasing characteristics of coated paperboard. The correlation between the bending strength (resistance) and time-dependent problems on the actual processing phenomenon has not been sufficiently discussed in the past. In this study, therefore, a prototype testing apparatus has been applied to investigate about the dynamic relaxation of bending moment. In order to reveal the relaxation characteristics of the bending resistance during the folding motion from an initial position up to a specified tracking angle, a white-coated paperboard of 0.3 mm thickness was scored with a creasing rule and then the bending test was carried out by varying the number of folding repetitions. Through this work, the followings were obtained: (1) The relaxation of the bending resistance was characterized by an exponential coefficient which was independent to the nominal shear strain while it varied with respect to the number of folding repetitions; (2) The relaxation coefficients of logarithmic approximation with the elapsed time are linearly characterized by the nominal shear strain and the number of folding repetitions; (3) The relaxation depends on the bending velocity.
format	article
author	Shigeru NAGASAWA Shinya OZAWA Yasushi FUKUZAWA
author_facet	Shigeru NAGASAWA Shinya OZAWA Yasushi FUKUZAWA
author_sort	Shigeru NAGASAWA
title	Effects of folding numbers, scoring depth and bending velocity on bending-moment relaxation of creased paperboard
title_short	Effects of folding numbers, scoring depth and bending velocity on bending-moment relaxation of creased paperboard
title_full	Effects of folding numbers, scoring depth and bending velocity on bending-moment relaxation of creased paperboard
title_fullStr	Effects of folding numbers, scoring depth and bending velocity on bending-moment relaxation of creased paperboard
title_full_unstemmed	Effects of folding numbers, scoring depth and bending velocity on bending-moment relaxation of creased paperboard
title_sort	effects of folding numbers, scoring depth and bending velocity on bending-moment relaxation of creased paperboard
publisher	The Japan Society of Mechanical Engineers
publishDate	2014
url	https://doaj.org/article/eb55a4d91812472499a6a09675a61326
work_keys_str_mv	AT shigerunagasawa effectsoffoldingnumbersscoringdepthandbendingvelocityonbendingmomentrelaxationofcreasedpaperboard AT shinyaozawa effectsoffoldingnumbersscoringdepthandbendingvelocityonbendingmomentrelaxationofcreasedpaperboard AT yasushifukuzawa effectsoffoldingnumbersscoringdepthandbendingvelocityonbendingmomentrelaxationofcreasedpaperboard
_version_	1718409815752966144

Effects of folding numbers, scoring depth and bending velocity on bending-moment relaxation of creased paperboard

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