The Behaviour of Recycled Material with Particles of Various Sizes of Polyamide 6 to Micro Hardness

2015 ◽  
Vol 662 ◽  
pp. 225-228
Author(s):  
Vojtech Senkerik ◽  
Michal Stanek ◽  
David Manas ◽  
Miroslav Manas ◽  
Adam Skrobak ◽  
...  
Keyword(s):  
Particle Size ◽  
Room Temperature ◽  
Size Variation ◽  
Polyamide 6 ◽  
Melting Rate ◽  
Dust Particles ◽  
Micro Hardness ◽  
Large Particles ◽  
Plastic Parts ◽  
Recycled Material

Every manufacture of any plastic parts produces some waste, such as defective injects or cold runner system from injection molding technology. This waste can be directly used several times. But when size of this material is reduced, particles of different sizes are made. From large particles similar to the original granulate material, to dust particles. This size variation can cause problems during subsequent processing. These particles of different size have distinct melting rate. That can cause an inhomogeneity of a melt and diverse structure of solidified polymer. This research paper studies the influence of the particle size of recycled polymeric material on the micro harness properties of semi-crystalline polyamide 6 at room temperature.

Effect of Particle Size of Recycled Polyamide 6 to Impact Toughness and Hardness

2015 ◽  
Vol 752-753 ◽  
pp. 300-303 ◽  
Author(s):  
Vojtech Senkerik ◽  
Michal Stanek ◽  
David Manas ◽  
Miroslav Manas ◽  
Adam Skrobak ◽  
...  
Keyword(s):  
Particle Size ◽  
Impact Toughness ◽  
Size Variation ◽  
Polyamide 6 ◽  
Melting Rate ◽  
Dust Particles ◽  
Hardness Tests ◽  
Effect Of Particle Size ◽  
Plastic Parts ◽  
Recycled Material

This work aims to investigate the effect of recycled material and effect of particle size on the mechanical properties of the recycled material. Tested material is polyamide 6. Every manufacture of any plastic parts produces certain amount of waste, such as defective injects or cold runner system from injection molding technology. When size of this material is reduced, particles of different sizes are made. From large particles similar to the original granulate material, to dust particles. This size variation can cause problems during subsequent processing. These particles of different size have distinct melting rate. To determine behavior of recycled material at room temperature. Impact toughness and hardness tests are performed.

Influence of Recycled Particle Size to Tensile Properties of Polyamide 6

2015 ◽  
Vol 752-753 ◽  
pp. 304-307 ◽  
Author(s):  
Vojtech Senkerik ◽  
Michal Stanek ◽  
David Manas ◽  
Miroslav Manas ◽  
Adam Skrobak ◽  
...  
Keyword(s):  
Particle Size ◽  
Ambient Temperature ◽  
Tensile Properties ◽  
Polymeric Material ◽  
Size Variation ◽  
Polyamide 6 ◽  
Melting Rate ◽  
Dust Particles ◽  
Subsequent Processing ◽  
Mechanical Tensile

The aim of this research is to show influence of particle size of recycled polymeric material to mechanical tensile properties. During grinding, the particles with various sizes are formed, from larger pieces to dust particles. This size variation can cause problems during subsequent processing. These particles of different sizes have distinct melting rate. That can cause an inhomogeneity of a melt and diverse structure of a solidified polymer. Several recycled mixtures with varied particle size after crushing were prepared. Tested polymer was polyamide 6 and the tests were performed at ambient temperature.

Effect of Recycled Particle Size to Micro-Hardness Properties of Styrene Acrylonitrile

2016 ◽  
Vol 368 ◽  
pp. 154-157 ◽  
Author(s):  
Vojtech Šenkeřík ◽  
Michal Stanek ◽  
David Manas ◽  
Miroslav Maňas ◽  
Adam Škrobák ◽  
...  
Keyword(s):  
Particle Size ◽  
Ambient Temperature ◽  
Research Paper ◽  
Dust Particles ◽  
Original Material ◽  
Micro Hardness ◽  
Large Particles ◽  
Effect Of Particle Size ◽  
Styrene Acrylonitrile ◽  
Recycled Material

The aim of this research paper is to study the effect of particle size of recycled material on the micro harness. Valuation of recycled material effect takes place in several mixtures of materials. These mixtures differ in particle size, which are made during grinding of plastic waste, from large particles similar to the original material to dust particles. The recycled material is always the same as is the original material. Tested material is styrene acrylonitrile SAN. Testing is performed at ambient temperature of 23°C. After the first recycling there is a change of hardness; which decrease mostly in mixture with the smallest particles.

scholarly journals Streaming instability of multiple particle species in protoplanetary disks

2018 ◽  
Vol 618 ◽  
pp. A75 ◽  
Author(s):  
Noemi Schaffer ◽  
Chao-Chin Yang ◽  
Anders Johansen
Keyword(s):  
Particle Size ◽  
Size Distribution ◽  
Protoplanetary Disks ◽  
Single Species ◽  
Stokes Number ◽  
Dust Particles ◽  
Particle Sizes ◽  
Particle Species ◽  
Streaming Instability ◽  
Large Particles

The radial drift and diffusion of dust particles in protoplanetary disks affect both the opacity and temperature of such disks, as well as the location and timing of planetesimal formation. In this paper, we present results of numerical simulations of particle-gas dynamics in protoplanetary disks that include dust grains with various size distributions. We have considered three scenarios in terms of particle size ranges, one where the Stokes number τs = 10−1−100, one where τs = 10−4−10−1, and finally one where τs = 10−3−100. Moreover, we considered both discrete and continuous distributions in particle size. In accordance with previous works we find in our multispecies simulations that different particle sizes interact via the gas and as a result their dynamics changes compared to the single-species case. The larger species trigger the streaming instability and create turbulence that drives the diffusion of the solid materials. We measured the radial equilibrium velocity of the system and find that the radial drift velocity of the large particles is reduced in the multispecies simulations and that the small particle species move on average outwards. We also varied the steepness of the size distribution, such that the exponent of the solid number density distribution, dN∕da ∝ a−q, is either q = 3 or q = 4. Overall, we find that the steepness of the size distribution and the discrete versus continuous approach have little impact on the results. The level of diffusion and drift rates are mainly dictated by the range of particle sizes. We measured the scale height of the particles and observe that small grains are stirred up well above the sedimented midplane layer where the large particles reside. Our measured diffusion and drift parameters can be used in coagulation models for planet formation as well as to understand relative mixing of the components of primitive meteorites (matrix, chondrules and CAIs) prior to inclusion in their parent bodies.

Study of Tensile Properties of Recycled Polypropylene with Glass Fibers at Different Temperature

2017 ◽  
Vol 756 ◽  
pp. 11-18 ◽  
Author(s):  
Vojtech Senkerik ◽  
Michal Stanek ◽  
Martin Ovsik ◽  
Lenka Hylova
Keyword(s):  
Tensile Properties ◽  
Preparation Method ◽  
Glass Fibers ◽  
Dust Particles ◽  
Original Material ◽  
Recycled Polypropylene ◽  
Large Particles ◽  
Small Dust ◽  
Recycled Material ◽  
Reinforcing Filler

This research paper studies the influence of preparation method of recycled polymer material with glass fibers on the tensile properties of the final product. The recycled material was made from polypropylene, which originally contained 30 % of glass fibers. It was divided into fractions using size of the crushed particles. These fractions ranged from large particles, similar to the original material, to small dust particles. Measurements were performed at various temperatures. It was found that the mixture of dust particles showed a large decrease in measured properties. It is mainly due to shortening of the large glass fibers, so that it no longer fulfills its function as reinforcing filler. Conversely, mixture with larger particles did not show a significant decrease in properties compared to the original material.

scholarly journals Study of The Biomass, Sand, and Biochar Fluidization in A Typical Bed of Fast Pyrolysis

2021 ◽  
Author(s):  
David Vasconcelos ◽  
José Ferreira Júnior ◽  
George Simonelli ◽  
Luiz Carlos Santos ◽  
Carlos Augusto de Moraes Pires
Keyword(s):  
Particle Size ◽  
Room Temperature ◽  
Fast Pyrolysis ◽  
Ternary Mixtures ◽  
Biomass Pyrolysis ◽  
Particle Segregation ◽  
New Correlation ◽  
Large Particles ◽  
Series Of Experiments ◽  
Biomass Transformation

Abstract Biomass pyrolysis usually occurs in a fluidized bed reactor formed by sand, biomass, and biochar. Dynamics this fluidization differs from that of literature because the biomass is converted continually in biochar. In this study, a series of experiments have been carried out for ternary mixtures of sand, sisal residue, and biochar, varying the compositions and particle size. The tests were based on two simplification hypotheses (steady state and room temperature) due to fast biomass transformation in bed and low Van der Waals force to large particles. The dynamic characteristics determined included the bed pressure drop and bed fluctuation. The single and combined effects of particle size and composition on the final fluidization velocity (Uff) and particle segregation (S) have been analyzed using response surface (RSM). The Uff and S minimum values were found when the variables were in the smallest particle size and composition levels. New correlations were developed for predicting the values of Uff. The error from measured values when using the new correlation was 7.6%, while the literature equation was 9.7%. The present correlations predicted reasonably well predicted the Uff of ternary mixtures in the fast pyrolysis bed.

Size Effect of Recycled Material to Tensile Properties of PC

2014 ◽  
Vol 1025-1026 ◽  
pp. 278-282 ◽  
Author(s):  
Vojtech Senkerik ◽  
Michal Stanek ◽  
David Manas ◽  
Miroslav Manas ◽  
Adam Skrobak ◽  
...  
Keyword(s):  
Particle Size ◽  
Tensile Test ◽  
Tensile Properties ◽  
Dust Particles ◽  
Original Material ◽  
Material Degradation ◽  
Material Parameters ◽  
Effect Of Particle Size ◽  
Mechanical Tensile ◽  
Recycled Material

The aim of this research paper is to study the effect of particle size of recycled polymeric material to mechanical tensile properties. During grinding particles are formed which have a different size, shape and surface, from larger pieces to dust particles. During processing these particles melt at different rates depending on their size. For example they can cause material degradation or lack of melt homogeneity. Several recycled mixtures were prepared that had differed particle size after crushing. The recycled material is always the same as is the original material. The studied material was a Polycarbonate. Testing was performed using a tensile test. When comparing a virgin polycarbonate with recycled mixtures, the particle size of the recycled material affects some of the material parameters quite substantially, but it had no effect on some other properties.

scholarly journals Evaluation of Marblewood Dust’s (Marmaroxylon racemosum) Effect on Ignition Risk

2021 ◽  
Vol 11 (15) ◽  
pp. 6874
Author(s):  
Miroslava Vandličkova ◽  
Iveta Markova ◽  
Katarina Holla ◽  
Stanislava Gašpercová
Keyword(s):  
Particle Size ◽  
Dust Particles ◽  
Wood Dust ◽  
Sieve Analysis ◽  
Granulometric Analysis ◽  
Analysis Measurement ◽  
Risk Research ◽  
Minimum Ignition Temperature ◽  
The Impact

The paper deals with the selected characteristics, such as moisture, average bulk density, and fraction size, of tropical marblewood dust (Marmaroxylon racemosum) that influence its ignition risk. Research was focused on sieve analysis, granulometric analysis, measurement of moisture level in the dust, and determination of the minimum ignition temperatures of airborne tropical dust and dust layers. Samples were prepared using a Makita 9556CR 1400W grinder and K36 sandpaper for the purpose of selecting the percentages of the various fractions (<63, 63, 71, 100, 200, 315, 500 μm). The samples were sized on an automatic vibratory sieve machine Retsch AS 200. More than 65% of the particles were determined to be under 100 μm. The focus was on microfractions of tropical wood dust (particles with a diameter of ≤100 µm) and on the impact assessment of particle size (particle size <100 µm) on the minimum ignition temperatures of airborne tropical dust and dust layers. The minimum ignition temperature of airborne marblewood dust decreased with the particle size to the level of 400 °C (particle size 63 μm).

Investigation of the different particle size dust releases from rigid filter candles during pulse-jet cleaning

2021 ◽  
pp. 095440622110179
Author(s):  
Xin Luan ◽  
Zhongli Ji ◽  
Longfei Liu ◽  
Ruifeng Wang
Keyword(s):  
Particle Size ◽  
Critical Role ◽  
Operating Conditions ◽  
Solid Particles ◽  
Dust Particles ◽  
Cleaning Efficiency ◽  
Term Operation ◽  
Cleaning Performance ◽  
Experimental Apparatus ◽  
Pulse Jet

Rigid filters made of ceramic or metal are widely used to remove solid particles from hot gases at temperature above 260 °C in the petrochemical and coal industries. Pulse-jet cleaning of fine dust from rigid filter candles plays a critical role in the long-term operation of these filters. In this study, an experimental apparatus was fabricated to investigate the behavior of a 2050 mm filter candle, which included monitoring the variation of pressure dynamic characteristics over time and observing the release of dust layers that allowed an analysis of the cleaning performance of ISO 12103-1 test dusts with different particle size distributions. These results showed the release behavior of these dusts could be divided into five stages: radial expansion, axial crack, flaky release, irregular disruption and secondary deposition. The cleaning performance of smaller sized dust particles was less efficient as compared with larger sized dust particles under the same operating conditions primarily because large, flaky-shaped dust aggregates formed during the first three stages were easily broken into smaller, dispersed fragments during irregular disruption that forced more particles back to the filter surface during secondary deposition. Also, a “low-pressure and long-pulse width” cleaning method improved the cleaning efficiency of the A1 ultrafine test dust from 81.4% to 95.9%.

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