The twisting force of aged consumers when opening a jar

Voorbij, A.I.M.; Steenbekkers, L.P.A.

doi:10.1016/s0003-6870(01)00028-x

Cited by 74 publications

(62 citation statements)

References 3 publications

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“…The maximum torque (8.7 Nm) previously reported during opening actions of a 'jar' (Voorbij and Steenbekkers 2002) was four times larger than the maximum torque (2.1 Nm) found in the present study. The difference could be due to: (a) the difference between the diameters of the circular objects tested (6.6 cm in Voorbij and Steenbekkers (2002) vs. 4.5 cm in this study); (b) the different grasping configurations (two-hand power grip vs. multi-digit precision grip); and (c) different friction coefficients of the contact surfaces (unknown coefficient of an aluminium surface vs. 1.5).…”

Section: Total Moments In Opening and Closing Directionscontrasting

confidence: 89%

“…In such an action, the fingers act in parallel and the forces acting on the object are easier to measure and quantify (Kinoshita et al 1995, 1996a, Santello and Soechting 2000, Rearick and Santello 2002, Shim et al 2003,b, 2005a. While several previous studies have addressed the manipulation of circular objects (Amis 1987, Lee and Rim 1991, Radhakrishnan and Nagaravindra 1993, Kinoshita et al 1996b, Shih and Wang 1997, Fowler and Nicol 1999, they mainly focused on the resultant force/moment (Fowler andNicol 1999, Voorbij andSteenbekkers 2002), single-digit force exerted on the object (Fowler and Nicol 1999) or the force production without a twisting action (Kinoshita et al 1996b). …”

Section: Introductionmentioning

confidence: 99%

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Multi-digit maximum voluntary torque production on a circular object

et al. 2007

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Individual digit-tip forces and moments during torque production on a mechanically fixed circular object were studied. During the experiments, subjects positioned each digit on a 6-dimensional force/ moment sensor attached to a circular handle and produced a maximum voluntary torque on the handle. The torque direction and the orientation of the torque axis were varied. From this study, it is concluded that: (1) the maximum torque in the closing (clockwise) direction was larger than in the opening (counter clockwise) direction; (2) the thumb and little finger had the largest and the smallest share of both total normal force and total moment, respectively; (3) the sharing of total moment between individual digits was not affected by the orientation of the torque axis or by the torque direction, while the sharing of total normal force between the individual digit varied with torque direction; (4) the normal force safety margins were largest and smallest in the thumb and little finger, respectively.

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Section: Total Moments In Opening and Closing Directionscontrasting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Multi-digit maximum voluntary torque production on a circular object

et al. 2007

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“…The results showed that the elderly and the young groups exhibited significantly different torque and force profiles when attempting to open the bottles. Similar work was also conducted by researchers focusing on the opening force measurement and opening postures of bottles and jars [17][18][19][20][21][22][23][24][25][26].This interest in understanding the issues around openability has led to the development of European and international guidelines on the measurement of packaging seal forces and user test panel methods. The European technical specification DD CEN/TS 15945 [26] launched in 2011 sets out a framework for ease of opening evaluation for packaging and has more recently been superseded by ISO17480.…”

Section: Introductionmentioning

confidence: 85%

“…Rowson and Yoxall [30] also reported that typically, women chose a grip that maximized their opportunity of opening the closure and that this grip choice was more limited than that available for men. According to Voorbij and Steenbekkers [18], gender influenced twisting force and opening toque when opening a jar of jam. Yoxall et al [21] studied squeeze strength with bottles and confirmed that women produced consistently lower forces than men.…”

Section: Fig 6-peel Force and Elongation At Break Of Machine And Hummentioning

confidence: 99%

Seal Strength Evaluation of Flexible Plastic Films by Machine Testing and Human Peeling

Nilmanee

Jinkarn

Jarupan

et al. 2018

Journal of Testing and Evaluation

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ABSTRACT:The seal strength of flexible packaging indicates both functional performance and the ease of opening. This research aims to compare the seal peeling mechanisms evaluated by human participants and standard machine tests. The tests were conducted on flexible films used for typical packaging applications, LDPE, LLDPE and Nylon/LLDPE. Human peeling was simulated through the use of novel force measurement equipment. The results showed that the maximum machine peel force set by standard test methods was generally lower than the human peel force for most sealing temperatures. In all film types no significant difference was shown between genders although for people over 65 years peel force was generally lower than for the younger cohort. The results also indicated that peeling speed of human participants was normally higher than the peeling speed set according to the machine test standard.

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“…For example, Han et al have investigated that the relationship between tab ring shape and the feelings in the fingertip when opening aluminum beverage cans; and they have concluded that the tab with a larger contact area with finger is better 1 . Openability of the bottle caps, which is one of a demand of aluminum beverage bottles for consumers' satisfaction, has been studied by some researchers [2][3][4][5][6][7] . However, these researchers have not determined the optimum opening diameter that is easy to open.…”

Section: Introductionmentioning

confidence: 99%

Development of Evaluation Function for Openability of Opening Diameter of Aluminum Beverage Bottles and Its Application to Optimum Design

Chihara¹,

Yamazaki²,

Sobajima³

et al. 2010

13th AIAA/ISSMO Multidisciplinary Analysis Optimization Conference

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The present paper proposes an evaluation function of openability considering the transition of gripping postures, i.e. two-finger gripping and three-finger gripping, so as to evaluate opening ease of aluminum beverage bottles and to specify the rigorous dimension of the cap diameter that is best suited for consumers' satisfaction. First, we have investigated effects of cap diameter on the gripping postures. It is found that subjects tend to shift the gripping posture from two-finger gripping (gripping with thumb and first finger) to threefinger gripping (gripping with thumb, first, and second finger) with increase of the opening diameter. An evaluation function is defined as a ratio between maximum torques that consumers can apply and a required torque for opening. In addition, the cap diameter is the only design variable, and the thumb length, which associates with the transition of the gripping postures and a maximum gripping force, is selected as a state variable in order to take individual differences into consideration. Moreover, an evaluation function is formulated considering the transition of the gripping postures of consumers. The function is composed by using the data obtained from measurement of the maximum gripping force, the maximum torque, and the thumb length, and then the function is optimized. The result of optimization has shown that the optimum opening diameter is obtained at 28.0 mm in case of the subjects.

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The twisting force of aged consumers when opening a jar

Cited by 74 publications

References 3 publications

Multi-digit maximum voluntary torque production on a circular object

Multi-digit maximum voluntary torque production on a circular object

Seal Strength Evaluation of Flexible Plastic Films by Machine Testing and Human Peeling

Development of Evaluation Function for Openability of Opening Diameter of Aluminum Beverage Bottles and Its Application to Optimum Design

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