Abdellah Haddout - Academia.edu (original) (raw)
Papers by Abdellah Haddout
Le travail presente traite de l'etude thermomecanique de l'ecoulement de polymeres et all... more Le travail presente traite de l'etude thermomecanique de l'ecoulement de polymeres et alliages de polymeres thermoplastiques renforces de fibres de verre dans des geometries simples. Dans un premier temps nous avons mis en evidence l'influence des parametres thermodynamiques de transformation par injection sur les proprietes mecaniques et viscoelastiques d'echantillons thermoplastiques composites a base de polyarylamide et d'alliages polypropylene-polyarylamide (pp/pa). Pour interpreter et justifier ces resultats, nous avons mene une etude approfondie de la microstructure des pieces injectees. Parallelement nous avons developpe un rheometre specifique directement adapte a la presse a injecter. Cet appareil original permet l'etablissement de lois de comportement rheologique de polymeres thermoplastiques dans des conditions reelles de transformation (pression, taux de cisaillement et temperature). Nous avons ainsi etudie l'evolution de la viscosite et de l'elasticite des alliages en pp/pa en fonction de la temperature, du taux de cisaillement et de la concentration en phase dispersee et deduit uneloi associe au cas des pp/pa pour une concentration en pp donnee. Le developpement d'un systeme informatise d'acquisition de donnees (pression-temperature) nous a permis de caracteriser l'influence de la pression, de la temperature et de la geometrie sur les pertes de charges lors de l'ecoulement de la matiere fondue dans l'empreinte du moule. La derniere partie de cette etude est consacree a la modelisation de la phase de remplissage du cycle d'injection pour des geometries simples en introduisant une loi de comportement rheologique thermodependante deduite de l'experience et en tenant compte de la solidification de la matiere en fonction du temps. Le modele propose pourrait faire l'objet d'une application aux cas de geometries complexes
Http Www Theses Fr, 1992
Le travail presente traite de l'etude thermomecanique de l'ecoulement de polymeres et all... more Le travail presente traite de l'etude thermomecanique de l'ecoulement de polymeres et alliages de polymeres thermoplastiques renforces de fibres de verre dans des geometries simples. Dans un premier temps nous avons mis en evidence l'influence des parametres thermodynamiques de transformation par injection sur les proprietes mecaniques et viscoelastiques d'echantillons thermoplastiques composites a base de polyarylamide et d'alliages polypropylene-polyarylamide (pp/pa). Pour interpreter et justifier ces resultats, nous avons mene une etude approfondie de la microstructure des pieces injectees. Parallelement nous avons developpe un rheometre specifique directement adapte a la presse a injecter. Cet appareil original permet l'etablissement de lois de comportement rheologique de polymeres thermoplastiques dans des conditions reelles de transformation (pression, taux de cisaillement et temperature). Nous avons ainsi etudie l'evolution de la viscosite et de l'elasticite des alliages en pp/pa en fonction de la temperature, du taux de cisaillement et de la concentration en phase dispersee et deduit uneloi associe au cas des pp/pa pour une concentration en pp donnee. Le developpement d'un systeme informatise d'acquisition de donnees (pression-temperature) nous a permis de caracteriser l'influence de la pression, de la temperature et de la geometrie sur les pertes de charges lors de l'ecoulement de la matiere fondue dans l'empreinte du moule. La derniere partie de cette etude est consacree a la modelisation de la phase de remplissage du cycle d'injection pour des geometries simples en introduisant une loi de comportement rheologique thermodependante deduite de l'experience et en tenant compte de la solidification de la matiere en fonction du temps. Le modele propose pourrait faire l'objet d'une application aux cas de geometries complexes
Polimeros-ciencia E Tecnologia, Dec 1, 1998
International Polymer Processing, Sep 1, 2000
The importance of polymer flow properties during processing has required the development of new o... more The importance of polymer flow properties during processing has required the development of new on line measurement systems, able to work under rates encountered during industrial processes. This paper will describe a rheometer which is able to study the thermorheological behavior of polymers within industrial injection or extrusion machines. Its main feature is to work at high shear rates which are experimented during production processes; it is equipped with dies of different diameters and lengths, allowing shear rates between 102 to 107 s−1. Some results concerning viscosity and first normal stress differences are presented for high density polyethylene (HDPE), polypropylene (PP) and polypropylene/polyarylamide blends (PP/PA). The plot of viscosity and first normal difference against shear rate for these materials are not linear. Two non Newtonian regions and a third one similar to Newtonian behavior were observed in the wide range of shear rates up to 8.106 s−1.
Journal of Reinforced Plastics and Composites, Jul 14, 2014
We present in this paper a numerical simulation of the filling stage of injection molding process... more We present in this paper a numerical simulation of the filling stage of injection molding process of thermoplastic composite reinforced with short fibers. We focused on analyzing the distribution of fiber’s orientation given by the variation of values of second-order orientation’s tensor in a rectangular geometry. The originality of our work is the introduction of a thermo-dependent law describing the behavior of material. This law is obtained experimentally using rheological measurements on online rheometer.
Composites, Feb 1, 1994
ABSTRACT
International Polymer Processing, Mar 1, 1995
Abstract This work deals with the experimental study of the rheological behaviour, the growth and... more Abstract This work deals with the experimental study of the rheological behaviour, the growth and evolution of the morphology of two components polyarylamide/polypropylene blends during injection molding. In the case of compatibilized blends, the viscosity shows two main results depending on shear rate. For low shear rates, up to 103 s−1, we notice a positive deviation in comparison with the additivity low, whereas a negative deviation is observed for high shear rates including injection molding conditions. The analysis of the morphology of the blend by scanning electronic microscopy shows a dispersed phase with nodules. The injection flow rate acts on the shape of the nodules and also on their repartition as obtained from a rectangular molded plate. The thermomechanical analysis of pure composition samples (100 % PA) and of a compatibilized mixture PA (70 %)/PP (30 %) has been studied.
Matériaux et techniques, 1996
RESUME. Le moulage par presse chauffante de stratifiés unidirectionnel (UD) en polypropylène renf... more RESUME. Le moulage par presse chauffante de stratifiés unidirectionnel (UD) en polypropylène renforcé de fibres de verre (GFPP) a été suivi par capteur fibre optique a réseaux de Bragg (FBG). Ces capteurs ont été incorporés au coeur du matériau pour suivre les déformations induites par le procédé. La phase de refroidissement étant déterminante dans la fabrication des composites thermoplastiques, affectant la cristallinité et les déformations résiduelles, deux moules métalliques (acier et aluminium) ayant des propriétés de diffusion thermique différentes ont été utilisés. Les capteurs à coeur ont permis de déterminer différentes phases du procédé et des points de transition clés tels que le début de la fusion ou la solidification. Le comportement dans le sens longitudinal est gouverné par celui des fibres de renfort. Dans le sens transverse, le stratifié réalisé avec le moule en aluminium présente des déformations résiduelles supérieures au stratifié réalisé avec le moule acier. Le comportement thermomécanique est évalué par TMA (Thermomechanical Analysis) suivant une procédure de recuit. Un comportement singulier est observé pour le stratifié réalisé avec le moule acier, indiquant l'influence de la diffusion thermique sur la construction cristalline. Le coefficient d'expansion thermique du stratifié réalisé avec le moule en aluminium est significativement supérieur. Une analyse DSC (Differential Scanning Calorimetry) révèle des taux de cristallinité semblables pour chaque matériau après fabrication ainsi qu'une même augmentation de ces taux lors du traitement thermique. La différence de propriétés thermomécaniques est alors attribuée à l'état initial de déformation des stratifiés. ABSTRACT. Hot-press molding of glass-fiber-reinforced polypropylene (GFPP) laminates was monitored using embedded fiber Bragg gratings (FBGs) in unidirectional laminates. These sensors allowed the monitoring of process-induced strains. Because the cooling phase is critical in thermoplastics manufacturing, affecting crystallinity and ultimately residual strain, two metallic molds with different heat diffusion capacities were used (steel and aluminum). The optical sensors proved to efficiently characterize some material properties; for example, strain variations could be related to physical changes of the laminate, revealing key transition MOTS-CLES : suivi de procédé, moulage par presse chauffante, fibre à réseaux de Bragg, déformations résiduelles, propriétés, thermoplastiques.
International Journal of Automotive and Mechanical Engineering, Mar 2, 2021
International Journal of Engineering Trends and Technology
International Journal of Engineering Trends and Technology
International Journal of Emerging Technology and Advanced Engineering
To increase their productivity, industrial companies are investing in the implementation of the L... more To increase their productivity, industrial companies are investing in the implementation of the Lean Manufacturing (LM) approach. Based on an analysis of the value chain, the approach reduces waste between the different production processes. The scope of this concept remains limited because it is based on static data. The technologies of the industry 4.0 concept allow the collection of data in real time. In this article, we present the results of a study conducted among companies in the automotive industry based in Morocco, in order to assess the level of deployment of the technologies of the 4.0 industry concept, and then analyze the impact of these technologies on the levers and key performance indicators of the Lean manufacturing approach. We have highlighted the technologies that have the most impact, namely: ERP, machine-to-machine communication (M2M communication), AIDC (Automatic Identification and Data Capture) and data analysis. The most impacted performance indicators are:...
During the course of the industrial 4.0 era, companies have been exponentially developed and have... more During the course of the industrial 4.0 era, companies have been exponentially developed and have digitized almost the whole business system to stick to their performance targets and to keep or to even enlarge their market share. Maintenance function has obviously followed the trend as it’s considered one of the most important processes in every enterprise as it impacts a group of the most critical performance indicators such as: cost, reliability, availability, safety and productivity. E-maintenance emerged in early 2000 and now is a common term in maintenance literature representing the digitalized side of maintenance whereby assets are monitored and controlled over the internet. According to literature, e-maintenance has a remarkable impact on maintenance KPIs and aims at ambitious objectives like zero-downtime.
BioRN: Medicine (Topic), 2019
Bio-composites based on natural fibers have aroused a lot of interest in various industrial field... more Bio-composites based on natural fibers have aroused a lot of interest in various industrial fields, such as the medical field, in particular the dental field. The socioeconomic and environmental aspects have their role in the development prospects of these products. The results this work, present a step forward of the industrial application of Bio composites in polypropylene reinforced with short Alfa fibers, in particular in the field of dental appliances. We applied different surface treatments to the obtained fibers, in order to promote their adhesion with the polypropylene matrix. We have conducted an in-depth study for the definition and optimization of the industrial conditions for injection molding of the Bio composites produced. We have highlighted the impact of surface treatment and injection molding conditions, such as mold temperature and injection speed: on the morphology as well as the thermo mechanical properties of the injected parts.
Among major problems encountered by manufacturers of highly concentrated color masterbatch is the... more Among major problems encountered by manufacturers of highly concentrated color masterbatch is the poor dispersion of the pigment caused by the strong tendency to build up agglomerations of powdered pigment particles. The aim of this study is to characterize the effect of the conditions of the premixing process and the formulation of the master batch of high concentration 40% on the quality of the dispersion. We studied the influence of the speed, temperature, time and order of the introduction of the premix ingredients and the use of a wetting agent on the dispersion quality by the colouring strength measurement and pressure test by filtration. A study by optical microscopy was considered.
The present research deals with an experimental study, both qualitative and quantitative, of fibe... more The present research deals with an experimental study, both qualitative and quantitative, of fibers' orientation and length distribution during the injection molding of polypropylene composites reinforced with short glass fibers. We've detailed particularly an analysis of fibers breakage during the plasticizing phase. We've studied the effect of plasticization conditions, more exactly, the screw rotation speed on the distribution of the fibers lengths. Then we've presented an experimental analysis of short glass fiber's orientation in an injected rectangular plate based on processing parameters, in particular the injection speed and the mold temperature and the reinforcement rate and the geometry flow. Finally, a study of the recyclability of thermoplastic short fiber composites has been detailed. We've assessed the impact of recycling on the fiber lengths distribution and on the final characteristics of the material. The main objective of this study is to es...
During the course of the industrial 4.0 era, companies have been exponentially developed and have... more During the course of the industrial 4.0 era, companies have been exponentially developed and have digitized almost the whole business system to stick to their performance targets and to keep or to even enlarge their market share. Maintenance function has obviously followed the trend as it’s considered one of the most important processes in every enterprise as it impacts a group of the most critical performance indicators such as: cost, reliability, availability, safety and productivity. E-maintenance emerged in early 2000 and now is a common term in maintenance literature representing the digitalized side of maintenance whereby assets are monitored and controlled over the internet. According to literature, e-maintenance has a remarkable impact on maintenance KPIs and aims at ambitious objectives like zero-downtime.
Materials Processing & Manufacturing eJournal, 2019
The use of thermoplastic composites reinforced with flax fibers in several field particularly in ... more The use of thermoplastic composites reinforced with flax fibers in several field particularly in the automotive and aeronautics sectors, provides a favorable response to environmental requirements and new regulations on the recycling composite materials. In this work, we present the experimental study of mechanical behavior, relaxation and morphological evolution of injected polypropylene / short flax fibers, depending on the mold temperature, the fiber content and the nature of coupling agent. This approach is motivated by the existence of relations between the microstructure, the thermal and mechanical parameters of injection molding and the viscoelastic properties of the material that we seek to highlight. temperature and the coupling agent rate have a decisive importance on the morphology and the mechanical properties of the injected composites. Finally, we improve the control of the injection molding process to optimize the visoelastic properties of manufactured parts.
The injected thermoplastics composites grow considerably in different industrial fields and provi... more The injected thermoplastics composites grow considerably in different industrial fields and provide increasing performance allowing manufacturers to consider innovative and competitive technical solutions. The extent of their physical and mechanical and aesthetic performance is constantly developed. However, the level of control of production technologies must be sufficiently high to better meet the specifications in terms of quality and performance and productivity, but also costs. In this paper, we present a numerical simulation of thermoplastic composites injection molding, in order to better predict the behavior of these materials during processing and propose operating conditions to give the best results and optimize the production. We studied the evolution of certain defects depending on implementation parameters: Temperature and pressure and speed of injection. The tested material is polypropylene reinforced at different rates (10 to 30%) of hemp fibers.
The purpose of this paper is to develop a shop floor management model for processes and operation... more The purpose of this paper is to develop a shop floor management model for processes and operations management that controls and enhances day-today facilities performance from following five axes: customer satisfaction, internal processes performance, problems solving and learning, continuous improvement, and Genshi Genbutsu. The model has been developed based on extensive review of literature on Lean Manufacturing, Lean Leadership, and operations management. The shop floor management model developed in this paper provides a useful daily agenda for the practical managers in monitoring and measuring of operations performance and enhances the Lean Leadership culture supposed as the critical factor in the success or failure of any Lean Manufacturing program.
Le travail presente traite de l'etude thermomecanique de l'ecoulement de polymeres et all... more Le travail presente traite de l'etude thermomecanique de l'ecoulement de polymeres et alliages de polymeres thermoplastiques renforces de fibres de verre dans des geometries simples. Dans un premier temps nous avons mis en evidence l'influence des parametres thermodynamiques de transformation par injection sur les proprietes mecaniques et viscoelastiques d'echantillons thermoplastiques composites a base de polyarylamide et d'alliages polypropylene-polyarylamide (pp/pa). Pour interpreter et justifier ces resultats, nous avons mene une etude approfondie de la microstructure des pieces injectees. Parallelement nous avons developpe un rheometre specifique directement adapte a la presse a injecter. Cet appareil original permet l'etablissement de lois de comportement rheologique de polymeres thermoplastiques dans des conditions reelles de transformation (pression, taux de cisaillement et temperature). Nous avons ainsi etudie l'evolution de la viscosite et de l'elasticite des alliages en pp/pa en fonction de la temperature, du taux de cisaillement et de la concentration en phase dispersee et deduit uneloi associe au cas des pp/pa pour une concentration en pp donnee. Le developpement d'un systeme informatise d'acquisition de donnees (pression-temperature) nous a permis de caracteriser l'influence de la pression, de la temperature et de la geometrie sur les pertes de charges lors de l'ecoulement de la matiere fondue dans l'empreinte du moule. La derniere partie de cette etude est consacree a la modelisation de la phase de remplissage du cycle d'injection pour des geometries simples en introduisant une loi de comportement rheologique thermodependante deduite de l'experience et en tenant compte de la solidification de la matiere en fonction du temps. Le modele propose pourrait faire l'objet d'une application aux cas de geometries complexes
Http Www Theses Fr, 1992
Le travail presente traite de l'etude thermomecanique de l'ecoulement de polymeres et all... more Le travail presente traite de l'etude thermomecanique de l'ecoulement de polymeres et alliages de polymeres thermoplastiques renforces de fibres de verre dans des geometries simples. Dans un premier temps nous avons mis en evidence l'influence des parametres thermodynamiques de transformation par injection sur les proprietes mecaniques et viscoelastiques d'echantillons thermoplastiques composites a base de polyarylamide et d'alliages polypropylene-polyarylamide (pp/pa). Pour interpreter et justifier ces resultats, nous avons mene une etude approfondie de la microstructure des pieces injectees. Parallelement nous avons developpe un rheometre specifique directement adapte a la presse a injecter. Cet appareil original permet l'etablissement de lois de comportement rheologique de polymeres thermoplastiques dans des conditions reelles de transformation (pression, taux de cisaillement et temperature). Nous avons ainsi etudie l'evolution de la viscosite et de l'elasticite des alliages en pp/pa en fonction de la temperature, du taux de cisaillement et de la concentration en phase dispersee et deduit uneloi associe au cas des pp/pa pour une concentration en pp donnee. Le developpement d'un systeme informatise d'acquisition de donnees (pression-temperature) nous a permis de caracteriser l'influence de la pression, de la temperature et de la geometrie sur les pertes de charges lors de l'ecoulement de la matiere fondue dans l'empreinte du moule. La derniere partie de cette etude est consacree a la modelisation de la phase de remplissage du cycle d'injection pour des geometries simples en introduisant une loi de comportement rheologique thermodependante deduite de l'experience et en tenant compte de la solidification de la matiere en fonction du temps. Le modele propose pourrait faire l'objet d'une application aux cas de geometries complexes
Polimeros-ciencia E Tecnologia, Dec 1, 1998
International Polymer Processing, Sep 1, 2000
The importance of polymer flow properties during processing has required the development of new o... more The importance of polymer flow properties during processing has required the development of new on line measurement systems, able to work under rates encountered during industrial processes. This paper will describe a rheometer which is able to study the thermorheological behavior of polymers within industrial injection or extrusion machines. Its main feature is to work at high shear rates which are experimented during production processes; it is equipped with dies of different diameters and lengths, allowing shear rates between 102 to 107 s−1. Some results concerning viscosity and first normal stress differences are presented for high density polyethylene (HDPE), polypropylene (PP) and polypropylene/polyarylamide blends (PP/PA). The plot of viscosity and first normal difference against shear rate for these materials are not linear. Two non Newtonian regions and a third one similar to Newtonian behavior were observed in the wide range of shear rates up to 8.106 s−1.
Journal of Reinforced Plastics and Composites, Jul 14, 2014
We present in this paper a numerical simulation of the filling stage of injection molding process... more We present in this paper a numerical simulation of the filling stage of injection molding process of thermoplastic composite reinforced with short fibers. We focused on analyzing the distribution of fiber’s orientation given by the variation of values of second-order orientation’s tensor in a rectangular geometry. The originality of our work is the introduction of a thermo-dependent law describing the behavior of material. This law is obtained experimentally using rheological measurements on online rheometer.
Composites, Feb 1, 1994
ABSTRACT
International Polymer Processing, Mar 1, 1995
Abstract This work deals with the experimental study of the rheological behaviour, the growth and... more Abstract This work deals with the experimental study of the rheological behaviour, the growth and evolution of the morphology of two components polyarylamide/polypropylene blends during injection molding. In the case of compatibilized blends, the viscosity shows two main results depending on shear rate. For low shear rates, up to 103 s−1, we notice a positive deviation in comparison with the additivity low, whereas a negative deviation is observed for high shear rates including injection molding conditions. The analysis of the morphology of the blend by scanning electronic microscopy shows a dispersed phase with nodules. The injection flow rate acts on the shape of the nodules and also on their repartition as obtained from a rectangular molded plate. The thermomechanical analysis of pure composition samples (100 % PA) and of a compatibilized mixture PA (70 %)/PP (30 %) has been studied.
Matériaux et techniques, 1996
RESUME. Le moulage par presse chauffante de stratifiés unidirectionnel (UD) en polypropylène renf... more RESUME. Le moulage par presse chauffante de stratifiés unidirectionnel (UD) en polypropylène renforcé de fibres de verre (GFPP) a été suivi par capteur fibre optique a réseaux de Bragg (FBG). Ces capteurs ont été incorporés au coeur du matériau pour suivre les déformations induites par le procédé. La phase de refroidissement étant déterminante dans la fabrication des composites thermoplastiques, affectant la cristallinité et les déformations résiduelles, deux moules métalliques (acier et aluminium) ayant des propriétés de diffusion thermique différentes ont été utilisés. Les capteurs à coeur ont permis de déterminer différentes phases du procédé et des points de transition clés tels que le début de la fusion ou la solidification. Le comportement dans le sens longitudinal est gouverné par celui des fibres de renfort. Dans le sens transverse, le stratifié réalisé avec le moule en aluminium présente des déformations résiduelles supérieures au stratifié réalisé avec le moule acier. Le comportement thermomécanique est évalué par TMA (Thermomechanical Analysis) suivant une procédure de recuit. Un comportement singulier est observé pour le stratifié réalisé avec le moule acier, indiquant l'influence de la diffusion thermique sur la construction cristalline. Le coefficient d'expansion thermique du stratifié réalisé avec le moule en aluminium est significativement supérieur. Une analyse DSC (Differential Scanning Calorimetry) révèle des taux de cristallinité semblables pour chaque matériau après fabrication ainsi qu'une même augmentation de ces taux lors du traitement thermique. La différence de propriétés thermomécaniques est alors attribuée à l'état initial de déformation des stratifiés. ABSTRACT. Hot-press molding of glass-fiber-reinforced polypropylene (GFPP) laminates was monitored using embedded fiber Bragg gratings (FBGs) in unidirectional laminates. These sensors allowed the monitoring of process-induced strains. Because the cooling phase is critical in thermoplastics manufacturing, affecting crystallinity and ultimately residual strain, two metallic molds with different heat diffusion capacities were used (steel and aluminum). The optical sensors proved to efficiently characterize some material properties; for example, strain variations could be related to physical changes of the laminate, revealing key transition MOTS-CLES : suivi de procédé, moulage par presse chauffante, fibre à réseaux de Bragg, déformations résiduelles, propriétés, thermoplastiques.
International Journal of Automotive and Mechanical Engineering, Mar 2, 2021
International Journal of Engineering Trends and Technology
International Journal of Engineering Trends and Technology
International Journal of Emerging Technology and Advanced Engineering
To increase their productivity, industrial companies are investing in the implementation of the L... more To increase their productivity, industrial companies are investing in the implementation of the Lean Manufacturing (LM) approach. Based on an analysis of the value chain, the approach reduces waste between the different production processes. The scope of this concept remains limited because it is based on static data. The technologies of the industry 4.0 concept allow the collection of data in real time. In this article, we present the results of a study conducted among companies in the automotive industry based in Morocco, in order to assess the level of deployment of the technologies of the 4.0 industry concept, and then analyze the impact of these technologies on the levers and key performance indicators of the Lean manufacturing approach. We have highlighted the technologies that have the most impact, namely: ERP, machine-to-machine communication (M2M communication), AIDC (Automatic Identification and Data Capture) and data analysis. The most impacted performance indicators are:...
During the course of the industrial 4.0 era, companies have been exponentially developed and have... more During the course of the industrial 4.0 era, companies have been exponentially developed and have digitized almost the whole business system to stick to their performance targets and to keep or to even enlarge their market share. Maintenance function has obviously followed the trend as it’s considered one of the most important processes in every enterprise as it impacts a group of the most critical performance indicators such as: cost, reliability, availability, safety and productivity. E-maintenance emerged in early 2000 and now is a common term in maintenance literature representing the digitalized side of maintenance whereby assets are monitored and controlled over the internet. According to literature, e-maintenance has a remarkable impact on maintenance KPIs and aims at ambitious objectives like zero-downtime.
BioRN: Medicine (Topic), 2019
Bio-composites based on natural fibers have aroused a lot of interest in various industrial field... more Bio-composites based on natural fibers have aroused a lot of interest in various industrial fields, such as the medical field, in particular the dental field. The socioeconomic and environmental aspects have their role in the development prospects of these products. The results this work, present a step forward of the industrial application of Bio composites in polypropylene reinforced with short Alfa fibers, in particular in the field of dental appliances. We applied different surface treatments to the obtained fibers, in order to promote their adhesion with the polypropylene matrix. We have conducted an in-depth study for the definition and optimization of the industrial conditions for injection molding of the Bio composites produced. We have highlighted the impact of surface treatment and injection molding conditions, such as mold temperature and injection speed: on the morphology as well as the thermo mechanical properties of the injected parts.
Among major problems encountered by manufacturers of highly concentrated color masterbatch is the... more Among major problems encountered by manufacturers of highly concentrated color masterbatch is the poor dispersion of the pigment caused by the strong tendency to build up agglomerations of powdered pigment particles. The aim of this study is to characterize the effect of the conditions of the premixing process and the formulation of the master batch of high concentration 40% on the quality of the dispersion. We studied the influence of the speed, temperature, time and order of the introduction of the premix ingredients and the use of a wetting agent on the dispersion quality by the colouring strength measurement and pressure test by filtration. A study by optical microscopy was considered.
The present research deals with an experimental study, both qualitative and quantitative, of fibe... more The present research deals with an experimental study, both qualitative and quantitative, of fibers' orientation and length distribution during the injection molding of polypropylene composites reinforced with short glass fibers. We've detailed particularly an analysis of fibers breakage during the plasticizing phase. We've studied the effect of plasticization conditions, more exactly, the screw rotation speed on the distribution of the fibers lengths. Then we've presented an experimental analysis of short glass fiber's orientation in an injected rectangular plate based on processing parameters, in particular the injection speed and the mold temperature and the reinforcement rate and the geometry flow. Finally, a study of the recyclability of thermoplastic short fiber composites has been detailed. We've assessed the impact of recycling on the fiber lengths distribution and on the final characteristics of the material. The main objective of this study is to es...
During the course of the industrial 4.0 era, companies have been exponentially developed and have... more During the course of the industrial 4.0 era, companies have been exponentially developed and have digitized almost the whole business system to stick to their performance targets and to keep or to even enlarge their market share. Maintenance function has obviously followed the trend as it’s considered one of the most important processes in every enterprise as it impacts a group of the most critical performance indicators such as: cost, reliability, availability, safety and productivity. E-maintenance emerged in early 2000 and now is a common term in maintenance literature representing the digitalized side of maintenance whereby assets are monitored and controlled over the internet. According to literature, e-maintenance has a remarkable impact on maintenance KPIs and aims at ambitious objectives like zero-downtime.
Materials Processing & Manufacturing eJournal, 2019
The use of thermoplastic composites reinforced with flax fibers in several field particularly in ... more The use of thermoplastic composites reinforced with flax fibers in several field particularly in the automotive and aeronautics sectors, provides a favorable response to environmental requirements and new regulations on the recycling composite materials. In this work, we present the experimental study of mechanical behavior, relaxation and morphological evolution of injected polypropylene / short flax fibers, depending on the mold temperature, the fiber content and the nature of coupling agent. This approach is motivated by the existence of relations between the microstructure, the thermal and mechanical parameters of injection molding and the viscoelastic properties of the material that we seek to highlight. temperature and the coupling agent rate have a decisive importance on the morphology and the mechanical properties of the injected composites. Finally, we improve the control of the injection molding process to optimize the visoelastic properties of manufactured parts.
The injected thermoplastics composites grow considerably in different industrial fields and provi... more The injected thermoplastics composites grow considerably in different industrial fields and provide increasing performance allowing manufacturers to consider innovative and competitive technical solutions. The extent of their physical and mechanical and aesthetic performance is constantly developed. However, the level of control of production technologies must be sufficiently high to better meet the specifications in terms of quality and performance and productivity, but also costs. In this paper, we present a numerical simulation of thermoplastic composites injection molding, in order to better predict the behavior of these materials during processing and propose operating conditions to give the best results and optimize the production. We studied the evolution of certain defects depending on implementation parameters: Temperature and pressure and speed of injection. The tested material is polypropylene reinforced at different rates (10 to 30%) of hemp fibers.
The purpose of this paper is to develop a shop floor management model for processes and operation... more The purpose of this paper is to develop a shop floor management model for processes and operations management that controls and enhances day-today facilities performance from following five axes: customer satisfaction, internal processes performance, problems solving and learning, continuous improvement, and Genshi Genbutsu. The model has been developed based on extensive review of literature on Lean Manufacturing, Lean Leadership, and operations management. The shop floor management model developed in this paper provides a useful daily agenda for the practical managers in monitoring and measuring of operations performance and enhances the Lean Leadership culture supposed as the critical factor in the success or failure of any Lean Manufacturing program.