Pole Europeen de Plasturgie

Bellignat, France

Pole Europeen de Plasturgie

Bellignat, France
SEARCH FILTERS
Time filter
Source Type

Jbilou F.,University of Lyon | Ayadi F.,French National Institute for Agricultural Research | Galland S.,University of Lyon | Joly C.,University of Lyon | And 3 more authors.
Journal of Applied Polymer Science | Year: 2012

Plasticized corn flour-based materials were prepared by extrusion and injection molding. Extrusion of corn flour blends (75% wet basis (wb)-glycerol (5 or 10% wb)-water) was performed in a twin-screw extruder with either one or three shearing zones. Native corn flour is mainly composed of corn starch granules surrounded by proteins layers. Therefore, the destructuration of corn flour by thermomechanical treatments was analyzed (i) by techniques essentially allowing to monitor corn starch amorphization (differential scanning calorimetry, X-ray diffractometry, determination of water sorption isotherms, susceptibility to hydrolysis by amylolytic enzymes) (ii) and via proteins layers role and distribution observed by confocal scanning laser microscopy and comparing the susceptibility of corn starch to hydrolysis by amylolytic enzymes in the presence or not of a protease. Both corn starch granules amorphization and proteins dispersion and aggregation were more pronounced for materials extruded in a screw profile with three shearing zones. For materials extruded in a screw profile with one shearing zone, the amorphization of starch was higher in materials made with 5% wb glycerol, whereas the proteins dispersion and aggregation was more pronounced in materials made with 10% wb glycerol. A barrier role of proteins to hydrolysis of corn starch by amylolytic enzymes was demonstrated and discussed. © 2011 Wiley Periodicals, Inc.


Jbilou F.,University of Lyon | Joly C.,University of Lyon | Galland S.,University of Lyon | Belard L.,Pole Europeen de Plasturgie | And 5 more authors.
Polymer Testing | Year: 2013

Plasticised corn flour/poly(butylene succinate-co-butylene adipate) (PBSA) materials were prepared by extrusion and injection in order to study the impact of PBSA ratio on their physicochemical properties and biodegradability. Scanning electron microscopy observations showed that corn flour and PBSA are incompatible. Three types of morphology have been observed: (i) starch dispersed in a PBSA matrix, (ii) a "co-continuous-like" morphology of starch and PBSA, and (iii) PBSA dispersed in a starch matrix. As expected, the extent of plasticised corn flour starch hydrolysis by amylolytic enzymes decreased when the amount of PBSA increased. Addition of a lipase to hydrolyse PBSA ester bonds enhanced enzymatic hydrolysis of starch by amylolytic enzymes in materials where PBSA formed a continuous phase. This suggests that PBSA formed a barrier restricting the access of amylolytic enzymes to starch. This was consistent with aerobic and anaerobic biodegradation assays, which also showed lower biodegradability of materials containing a majority of PBSA. © 2013 Elsevier Ltd. All rights reserved.


Agazzi A.,Pole Europeen de Plasturgie | Sobotka V.,CNRS Nantes Thermocinetique Lab | Le Goff R.,Pole Europeen de Plasturgie | Jarny Y.,CNRS Nantes Thermocinetique Lab
ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis, ESDA 2012 | Year: 2012

Injection is one of the most used processes to manufacture thermoplastic parts. The design of the cooling channels in this process is of great importance during the mould design. Indeed, an inappropriate cooling will lead to defects in the part and a low production rate. In this paper, a new approach for the design of the cooling channels is assessed. Based on morphological concepts, the idea of regulation by cooling surface is introduced. The thermal behaviour of the mould can be restricted on the spatial domain delimited by the cooling surface on which a spatial temperature distribution is imposed. The first step of the methodology leads to the optimal determination of the fluid temperature distribution along the cooling surface in order to minimize a cost function composed of two terms linked to the quality of the part and the productivity of the process. The conjugate gradient algorithm coupled with a Lagrangian technique is implemented for the determination of fluid temperature parameters. However, the obtained solution is not workable in practice. The second step consists then in building real channels from this optimal distribution. The shape, location and fluid temperature level of these channels are determined a posteriori from the thermal analysis of the temperature field in the mould domain located between the plastic part and the cooling surface. Channels are builded by using the contours of isotherms in the thermal steady-state area of the mould. It becomes then possible to design the cooling channels with no a priori on the numbers, the location of these channels and on the temperature of the coolant fluid. The methodology is first illustrated with a 2D part. Results are compared with literature. Copyright © 2012 by ASME.


Agazzi A.,Pole Europeen de Plasturgie | Sobotka V.,CNRS Nantes Thermocinetique Lab | Legoff R.,Pole Europeen de Plasturgie | Jarny Y.,CNRS Nantes Thermocinetique Lab
Key Engineering Materials | Year: 2013

In this paper, a new methodology for the design of effective cooling system of thermoplastic injection tools is proposed. It is named MCOOLR for Morpho Cooling. It allows the design of the cooling channels in the mold with no a priori on the number, the size, the shape of the channels and the temperature of the coolant before performing the optimization. Numerical and experimental results obtained on a mold manufactured thanks to this methodology are compared with those coming from a conventional design. The criteria used to discriminate the results are based on the uniformity of the temperature field in the molded part and on the final warpage of the part. Copyright © 2013 Trans Tech Publications Ltd.


Agazzi A.,CNRS Nantes Thermocinetique Lab | Sobotka V.,CNRS Nantes Thermocinetique Lab | Le Goff R.,Pole Europeen de Plasturgie | Garcia D.,Pole Europeen de Plasturgie | Jarny Y.,CNRS Nantes Thermocinetique Lab
International Journal of Material Forming | Year: 2010

In thermoplastic injection moulding, part quality and cycle time depend strongly on the cooling stage. Numerous strategies have been investigated in order to determine the cooling conditions which minimize undesired defects such as warpage and differential shrinkage. In this paper we propose a methodology for the optimal design of the cooling system. Based on geometrical analysis, the cooling line is defined by using conformal cooling concept. It defines the locations of the cooling channels. We only focus on the distribution and intensity of the fluid temperature along the cooling line which is here fixed. We formulate the determination of this temperature distribution, as the minimization of an objective function composed of two terms. It is shown how this two antagonist terms have to be weighted to make the best compromise. The expected result is an improvement of the part quality in terms of shrinkage and warpage. © 2010 Springer-Verlag France.


Le Goff R.,Pole Europeen de Plasturgie | Boyard N.,CNRS Nantes Thermocinetique Lab | Sobotka V.,CNRS Nantes Thermocinetique Lab | Lefvre N.,CNRS Nantes Thermocinetique Lab | Delaunay D.,CNRS Nantes Thermocinetique Lab
Polymer Testing | Year: 2011

An instrumented injection mould was designed to determine the crystallization kinetics of semi-crystalline polymers and short fibre reinforced bulk composites. This set-up is an interesting alternative to other characterization devices since it is more representative of injection process conditions, and bulk samples are more suitable for studying reinforced polymers. We developed a methodology to estimate the Nakamura kinetic function K(T) by solving an inverse 1D heat conduction problem coupled to the kinetic equation. Estimated parameters are obtained in a temperature range which depends on the cooling rate. We first validated the experimental approach with a well characterized isotactic polypropylene. Then, we used this setup to determine the kinetic function of a technical polymer (poly m-xylylene adipamide-MXD6), for which the crystallization is complex since it contains nucleating agents. Our results are compared with a literature empirical model and with those obtained by DSC. © 2011 Elsevier Ltd. All rights reserved.


Agazzi A.,Pole Europeen de Plasturgie | Sobotka V.,University of Nantes | Legoff R.,Pole Europeen de Plasturgie | Jarny Y.,University of Nantes
Applied Thermal Engineering | Year: 2013

The design of the cooling channels in the thermoplastic injection process is one of the most important steps during the mould design. An inappropriate cooling will lead to defects in the part and a low production rate. In this paper, a new approach with no a priori for the design of the cooling channels is presented for the determination of the cooling system of a 3D industrial part. Based on morphological concepts, the idea of regulation of the temperatures of the polymer and the mould by a cooling surface is introduced. The methodology is decomposed in two steps: the first step leads to the determination of the optimal fluid temperature distribution along the cooling surface in order to minimize an objective function composed of two terms linked to the quality of the part and the productivity of the process. The conjugate gradient algorithm coupled with a Lagrangian technique is implemented for the determination of the distribution of the fluid temperature. The second step illustrates the transition from cooling surface to discrete cooling channels, based on the analysis of the isothermal surfaces in the mould. © 2012 Elsevier Ltd. All rights reserved.


Le Goff R.,Pole Europeen de Plasturgie | Garcia D.,Pole Europeen de Plasturgie
Society of Plastics Engineers - EUROTEC 2011 Conference Proceedings | Year: 2011

The manufacturing of thermoplastics parts needs a cooling phase to give the shape to the part. In injection molding, cooling can represent more than 70 % of the total cycle time. This is the reason why cooling channels have to be designed with great care in order to meet quality with efficiency requirements. In this paper, we propose a methodology to optimize the geometry parameters and coolant temperatures of the channels based on the use of modeFRONTIER® software combined with the injection molding simulation software MOLDFLOW®. Multi-objective optimisation will be carried out with criterions based on quality and cycle time minimization.


Patent
Pole Europeen De Plasturgie and French Atomic Energy Commission | Date: 2012-04-24

The method for assembling a microelectronic chip device (101) in a fabric (104) comprises the following steps: providing a microelectronic chip device (101) comprising a base (102) and a protruding element (103) rising from a face of the base (102), said protruding element (103) comprising a free end opposite the base (102); inserting into the fabric (104) the chip device (101) by the free end of the protruding element; deforming the protruding element (105) at its free end so as to ensure the securing of the chip device (101) with the fabric (104) by forming a crimping bead (106).


Sanz C.,Fundacion TEKNIKER IK4 CIC MarGUNE | Navas Garcia V.,Fundacion TEKNIKER IK4 CIC MarGUNE | Gonzalo O.,Fundacion TEKNIKER IK4 CIC MarGUNE | Vansteenkisteb G.,Pole Europeen de Plasturgie
Procedia Engineering | Year: 2011

Rapid Manufacturing like Direct Metal Laser Sintering (DMLS) is starting to be implemented in the development of functional components. Therefore, surface integrity of these parts must be carefully analysed for the fulfillment of current technical requirements. In this work, CoCr, Maraging Steel and Inconel parts subjected to different thermal and mechanical finishing treatments (shot peening and polishing) have been characterized with the objective of determining the optimum stress relieving treatment. It has been studied the effect of these stabilization treatments mainly on residual stresses and hardness. In general, the rapid manufacturing process generates detrimental residual stresses and shot peening, and final polishing improve and homogenize the surface residual state of the parts. © 2012 Published by Elsevier Ltd.

Loading Pole Europeen de Plasturgie collaborators
Loading Pole Europeen de Plasturgie collaborators