Test of Rupture Strength of Thin Plastic Films

1950 ◽  
Vol 21 (5) ◽  
pp. 491-492 ◽  
Author(s):  
Joses J. L. Chen
Keyword(s):  
Rupture Strength ◽  
Plastic Films ◽  
Thin Plastic

scholarly journals Sea Water Contamination in the Vicinity of the Italian Minor Islands Caused by Microplastic Pollution

Water ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 1108 ◽  
Author(s):  
Giuseppe de Lucia ◽  
Alvise Vianello ◽  
Andrea Camedda ◽  
Danilo Vani ◽  
Paolo Tomassetti ◽  
...  
Keyword(s):  
Water Contamination ◽  
Sea Water ◽  
Ethylene Vinyl Acetate ◽  
Average Density ◽  
Spectroscopy Analysis ◽  
Policy Makers ◽  
Plastic Films ◽  
Thin Plastic ◽  
Abundance And Distribution ◽  
River Mouths

The abundance and distribution of microplastics (MP) were evaluated in six “clean” sites (Italian minor islands) and in two “polluted” areas (near the mouth of two major Italian rivers). Samples of MP, plankton and persistent organic pollutants (POPs) were collected using a manta trawl (MA) and a plankton net (WP2), both lined with a 333 µm mesh net. MP have been confirmed to be ubiquitous since they were found at each site, showing an average density of 0.3 ± 0.04 items/m3 (values ranged from 0.641 to 0.119 ). When comparing the clean sites with the polluted ones, a significantly higher value of MP was found near the river mouths. The most common types of MP were synthetic filaments (50.24%), followed by fragments (30.39%), thin plastic films (16.98%) and spheres (2.39%). Infrared spectroscopy analysis highlighted that the most abundant polymers were polyethylene (PE-26%), polypropylene (PP-11%), polyethylene-terephthalate/polyester (PET/PEST-8%) and ethylene-vinyl-acetate (EVA-5%). Polychlorinated biphenyls and organochlorine pesticides were detected in all the samples with a high variability among sites and depths. This study adds to the existing information on the distribution of contaminants across the Mediterranean Sea, and is useful to policy makers who wish to implement effective measures to reduce MP pollution.

Thermal Effects on Ultrasonic Joining of Thin Plastic Films Using Torsional Vibrations

2008 ◽  
Vol 47 (8) ◽  
pp. 6431-6436 ◽  
Author(s):  
Kazunari Adachi ◽  
Tsuyoshi Takahashi ◽  
Kenichi Kamehashi ◽  
Kazumi Watanabe ◽  
Kenta Uchiyama ◽  
...  
Keyword(s):  
Thermal Effects ◽  
Torsional Vibrations ◽  
Plastic Films ◽  
Thin Plastic

The environmental degradation of thin plastic films

1993 ◽  
Vol 31 (3) ◽  
pp. 179-198 ◽  
Author(s):  
Philip J. Whitney ◽  
Clare H. Swaffield ◽  
Andrew J. Graffham
Keyword(s):  
Environmental Degradation ◽  
Plastic Films ◽  
Thin Plastic

On the Weathering of Thin Plastic Films

1983 ◽  
Vol 105 (2) ◽  
pp. 149-156 ◽  
Author(s):  
H. Cheng ◽  
R. B. Bannerot
Keyword(s):  
Thermal Effects ◽  
Solar Collector ◽  
Solar Irradiation ◽  
Plastic Film ◽  
Degradation Mechanisms ◽  
Plastic Films ◽  
Mechanical Effects ◽  
Thin Plastic

A program is described for the controlled degradation and evaluation of thin plastic film samples in a set of parallel (in time) exposures. The intent of the various exposures is to separate the effects of identifiable degradation mechanisms associated with each material’s use as a solar collector cover. The mechanisms considered were those due to: (i) environment less solar irradiation (chemical, abrasion, humidity, etc.); (ii) environment including solar irradiation; (iii) thermal effects and (iv) mechanical effects. The procedures described in the program are illustrated by presenting the details for the evaluation of two commonly used plastic films.

Leak rates of thin plastic films

1971 ◽  
Vol 4 (12) ◽  
pp. 1073-1074 ◽  
Author(s):  
B E Woodgate
Keyword(s):  
Plastic Films ◽  
Thin Plastic

scholarly journals Numerical Investigation of Excitation of Various Lamb Waves Modes in Thin Plastic Films

2022 ◽  
Vol 12 (2) ◽  
pp. 849
Author(s):  
Rymantas Jonas Kazys ◽  
Justina Sestoke ◽  
Egidijus Zukauskas
Keyword(s):  
Numerical Investigation ◽  
Lamb Wave ◽  
Guided Waves ◽  
Phased Array ◽  
Ultrasonic Transducer ◽  
Guided Wave ◽  
Ultrasonic Guided Waves ◽  
Plastic Films ◽  
Thin Plastic ◽  
Wave Modes

Ultrasonic-guided waves are widely used for the non-destructive testing and material characterization of plates and thin films. In the case of thin plastic polyvinyl chloride (PVC), films up to 3.2 MHz with only two Lamb wave modes, antisymmetrical A0 and symmetrical S0, may propagate. At frequencies lower that 240 kHz, the velocity of the A0 mode becomes slower than the ultrasonic velocity in air which makes excitation and reception of such mode complicated. For excitation of both modes, we propose instead a single air-coupled ultrasonic transducer to use linear air-coupled arrays, which can be electronically readjusted to optimally excite and receive the A0 and S0 guided wave modes. The objective of this article was the numerical investigation of feasibility to excite different types of ultrasonic-guided waves, such as S0 and A0 modes in thin plastic films with the same electronically readjusted linear phased array. Three-dimensional and two-dimensional simulations of A0 and S0 Lamb wave modes using a single ultrasonic transducer and a linear phased array were performed. The obtained results clearly demonstrate feasibility to excite efficiently different guided wave modes in thin plastic films with readjusted phased array.

scholarly journals Attenuation of a Slow Subsonic A0 Mode Ultrasonic Guided Wave in Thin Plastic Films

Materials ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1648 ◽  
Author(s):  
Rymantas Kažys ◽  
Reimondas Šliteris ◽  
Liudas Mažeika ◽  
Olgirdas Tumšys ◽  
Egidijus Žukauskas
Keyword(s):  
Guided Waves ◽  
High Efficiency ◽  
Lamb Waves ◽  
Ultrasonic Transducer ◽  
Plane Waves ◽  
Ultrasound Velocity ◽  
Guided Wave ◽  
Low Frequencies ◽  
Plastic Films ◽  
Thin Plastic

The ultrasonic testing technique using Lamb waves is widely used for the non-destructive testing and evaluation of various structures. For air-coupled excitation and the reception of A0 mode Lamb waves, leaky guided waves are usually exploited. However, at low frequencies (<100 kHz), the velocity of this mode in plastic and composite materials can become slower than the ultrasound velocity in air, and its propagation in films is accompanied only by an evanescent wave in air. To date, the information about the attenuation of the slow A0 mode is very contradictory. Therefore, the objective of this investigation was the measurement of the attenuation of the slow A0 mode in thin plastic films. The measurement of the attenuation of normal displacements of the film caused by a propagating slow A0 mode is discussed. The normal displacements of the film at different distances from the source were measured by a laser interferometer. In order to reduce diffraction errors, the measurement method based on the excitation of cylindrical but not plane waves was proposed. The slow A0 mode was excited in the polyvinylchloride film by a dry contact type ultrasonic transducer made of high-efficiency PMN-32%PT strip-like piezoelectric crystal. It was found that that the attenuation of the slow A0 mode in PVC film at the frequency of 44 kHz is 2 dB/cm. The obtained results can be useful for the development of quality control methods for plastic films.

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