scholarly journals Validation of Methods for the Optical Characterisation of the Wettability of Polymeric Films for Food Packaging

2014 ◽  
Vol 2014 ◽  
pp. 1-6
Author(s):  
Giulio D’Emilia ◽  
Emanuela Natale
Keyword(s):  
Experimental Data ◽  
Food Packaging ◽  
Vision System ◽  
Uncertainty Assessment ◽  
Contact Angles ◽  
Polymeric Films ◽  
Liquid Drops ◽  
Principal Influence ◽  
Physical Quantities ◽  
Quantities Of Interest

A methodology is described for the theoretical-experimental evaluation of the measurement uncertainty of the polar and dispersive components of the surface free energy (SFE) in polypropylene films; these parameters are related to the film wettability of adhesives and inks. The proposed method is based on the measurement by means of a vision system of the contact angles of liquid drops deposited on the film itself, which allows for obtaining, through mathematical models drawn from the literature, the physical quantities of interest. The effect of the principal influence parameters has been experimentally evaluated, and testing has allowed the defining of the technical procedures readily transferable in the industry. The uncertainty assessment is interesting not only to correctly evaluate experimental data but also to characterise the reproducibility of the effects of techniques for improving the wettability of films, such as surface treatments.

A simplified model of a multi-jointed mechanical finger calibrated with experimental data by vision system

2021 ◽  
Vol 235 (1) ◽  
pp. 164-175
Author(s):  
C Cosenza ◽  
V Niola ◽  
S Savino
Keyword(s):  
Experimental Data ◽  
Vision System ◽  
Control Strategies ◽  
Image Correlation ◽  
Robotic Hand ◽  
Prosthetic Device ◽  
Prosthetic Hands ◽  
Mechanical Hand ◽  
Free Mode ◽  
Mechanical Finger

The development of suitable models for mechanical fingers, whether they are part of prosthetic device or of a robotic hand, is a powerful tool to predict the behaviour of their components since the early stages of design, especially for underactuated mechanisms. Experimental data can improve the reliability of such models and promote their application to build proper control strategies especially for prosthetic hands. Here, we have developed a multi-jointed model of a mechanical finger. The finger is part of the Federica hand: an underactuated mechanical hand that was conceived for prosthetic purpose. The model accounts for friction phenomena in the finger and it is tuned with experimental data acquired through a digital image correlation device. The model allowed us to write kinematics relations of the phalanges and evaluate finger configurations in relation to the closure velocity. Moreover, it was possible to estimate the tendon force and the work analysis occurring during the closure tasks, both in free mode and in presence of objects.

scholarly journals Design of Sodium Alginate/Gelatin-Based Emulsion Film Fused with Polylactide Microparticles Charged with Plant Extract

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 745 ◽  
Author(s):  
Weronika Prus-Walendziak ◽  
Justyna Kozlowska
Keyword(s):  
Sodium Alginate ◽  
Plant Extract ◽  
Contact Angles ◽  
Polymeric Films ◽  
Solvent Evaporation Method ◽  
Calendula Officinalis ◽  
Flower Extract ◽  
Polymeric Microparticles ◽  
Emulsion Film ◽  
Emulsion Films

This study aimed at designing emulsion films based on sodium alginate, gelatin, and glycerol, and their modification by the addition of lipids (cottonseed oil and beeswax). Film composition with the most promising properties was further modified by the incorporation of polylactide (PLA) microparticles with Calendula officinalis flower extract. PLA microspheres were obtained by the emulsion/solvent evaporation method. The size distribution of oily particles in emulsions was investigated. Mechanical properties, moisture content, UV-Vis spectra, and the color of films were analyzed, while biophysical skin parameters were assessed after their application to the skin. Moreover, the contact angles were measured, and the surface free energy of polymeric films was determined. An investigation of the amount of Calendula officinalis flower extract which can be incorporated into PLA microparticles was performed. The modification of the composition of films significantly influenced their physicochemical properties. The selected active ingredient in the form of plant extract was successfully incorporated into polymeric microparticles that were further added into the developed emulsion film. The condition of the skin after the application of obtained emulsion films improved. The prepared materials, especially containing microparticles with plant extract, can be considered for designing new cosmetic forms, such as cosmetic masks, as well as new topical formulations for pharmaceutical delivery.

Two Mixed Problems for a Semi-Infinite Layer

1972 ◽  
Vol 39 (4) ◽  
pp. 1121-1124 ◽  
Author(s):  
L. M. Keer ◽  
M. A. G. Silva
Keyword(s):  
Boundary Value Problems ◽  
Mixed Boundary ◽  
Boundary Value ◽  
Rigid Foundation ◽  
Mixed Boundary Value Problems ◽  
Infinite Layer ◽  
Mixed Problems ◽  
Physical Quantities ◽  
Quantities Of Interest

Two mixed boundary-value problems for a semi-infinite layer are studied. The first is that of a uniformly loaded layer resting on a smooth, rigid foundation and lifted at its end. The second problem concerns a semi-infinite layer with an end crack parallel to and midway between the two surfaces that is opened by end loads. Physical quantities of interest appropriate to both problems are calculated.

The stability of pendent liquid drops. Part 1. Drops formed in a narrow gap

1973 ◽  
Vol 59 (4) ◽  
pp. 753-767 ◽  
Author(s):  
E. Pitts
Keyword(s):  
Contact Angles ◽  
Two Dimensional ◽  
Narrow Gap ◽  
Cross Sectional ◽  
Liquid Drops ◽  
Maximum Area ◽  
Area Increase ◽  
Equilibrium Profiles ◽  
The Stability ◽  
Horizontal Support

We consider a drop of liquid hanging from a horizontal support and sandwiched between two vertical plates separated by a very narrow gap. Equilibrium profiles of such ‘two-dimensional’ drops were calculated by Neumann (1894) for the case when the angle of contact between the liquid and the horizontal support is zero. This paper gives the equilibrium profiles for other contact angles and the criterion for their stability. Neumann showed that, as the drop height increases, its cross-sectional area increases until a maximum is reached. Thereafter, as the height increases, the equilibrium area decreases. This behaviour is shown to be typical of all contact angles. When the maximum area is reached, the total energy is a minimum. It is shown that the drops are stable as long as the height and the area increase together.

A Measurement and Analyze System for the KY231 Material Strain Tester Base on STM8S207 and Virtual Instrument

2013 ◽  
Vol 785-786 ◽  
pp. 1341-1347
Author(s):  
Tie Wang Liang ◽  
Yan Ren
Keyword(s):  
Experimental Data ◽  
Circuit Design ◽  
Measurement System ◽  
Virtual Instrument ◽  
Historical Data ◽  
Usb Interface ◽  
Measurement And Analysis ◽  
Analysis System ◽  
As Stress ◽  
Physical Quantities

A measurement and analysis system is designed base on the requirement of digital upgrade to the KY231 Material strain tester. This system is made up of two parts :The analyze system based on the LABWINDOWS and the measurement system based on STM8S207. The physical quantities (such as stress, pressure, deformation, etc.) of the metal specimen are acquired, displayed and analyzed digitally in this system, meanwhile the experimental data and curves can be stored in the systerm and compared to the historical data saved in the previous files. Because the USB interface is too complex to the MCU systerm form the aspart of the programming and circuit design, the PL2303 is used to simulate USB interface as virtual RS232 for the communication between the measurement system and the analyze system.

Naringinase Immobilization in Polymeric Films Intended for Food Packaging Applications

2003 ◽  
Vol 68 (6) ◽  
pp. 2046-2049 ◽  
Author(s):  
M.A. Del Nobile ◽  
L. Piergiovanni ◽  
G.G. Buonocore ◽  
P. Fava ◽  
M.L. Puglisi ◽  
...  
Keyword(s):  
Food Packaging ◽  
Polymeric Films
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