S. Puissant's scientific contributions
What is this page?
This page lists the scientific contributions of an author, who either does not have a ResearchGate profile, or has not yet added these contributions to their profile.
It was automatically created by ResearchGate to create a record of this author's body of work. We create such pages to advance our goal of creating and maintaining the most comprehensive scientific repository possible. In doing so, we process publicly available (personal) data relating to the author as a member of the scientific community.
If you're a ResearchGate member, you can follow this page to keep up with this author's work.
If you are this author, and you don't want us to display this page anymore, please let us know.
It was automatically created by ResearchGate to create a record of this author's body of work. We create such pages to advance our goal of creating and maintaining the most comprehensive scientific repository possible. In doing so, we process publicly available (personal) data relating to the author as a member of the scientific community.
If you're a ResearchGate member, you can follow this page to keep up with this author's work.
If you are this author, and you don't want us to display this page anymore, please let us know.
Publications (11)
The objective of this article is to determine a wire coating-hanger melt distributor geometry to ensure a homogenous exit velocity distribution that will best accommodate a wide material range and multiple operating conditions (i.e., die wall temperature and flow rate change). The computational approach incorporates finite element (FE) analysis to...
A new optimisation methodology for the design of coat-hanger dies is presented. Two approaches are presented to optimise the velocities distribution across the die exit. In the first approach, we predict the optimal shape of a coat hanger die; in the second approach, to keep the same geometry and avoid design of a new die, we optimise the temperatu...
Balancing the distribution of flow through a die to achieve a uniform velocity distribution is the primary objective and one of the most difficult tasks of extrusion die design. If the manifold in a Coat-hanger die is not properly designed, the exit velocity distribution may be not uniform; this can affect the thickness across the width of the die....
THE coat-hanger melt distributor is a device commonly used in the wire coating process. Its task is to distribute the melt around the conductor uniformly. It is quite common that materials and flow rates differ from what had been specified during the design procedure. This may lead to bad performance with materials of very different rheological pro...
![Table 1 Characteristics of the various mesh size Mesh Mesh size [ mm ]...](profile/Fabrice-Schmidt/publication/225807893/figure/tbl1/AS:668840694386688@1536475456018/Characteristics-of-the-various-mesh-size-Mesh-Mesh-size-mm-according-to-each_Q320.jpg)
A new approach to the optimal design of the die wall temperature profile in polymer extrusion processes is presented. In this
approach, optimization of the design variables is conducted by a Response Surface Method (RSM) and the Sequential Quadratic
Programming (SQP) algorithm. Design of experiment (DoE) needed for the construction of the response...
Polymer extrusion is one of the most important manufacturing methods used today. A flat die, is commonly used to extrude thin thermoplastics sheets. If the channel geometry in a flat die is not designed properly, the velocity at the die exit may be perturbed, which can affect the thickness across the width of the die. The ultimate goal of this work...
Viscosity is an important characteristic of flow property's and process ability for polymeric materials. A flat die was developed by Maillefer-extrusion, to make rheological characterisations. In this paper, the rheological parameters of the melt are identified through optimisation by a response surface method. The objective is to minimize the diff...
Citations
... Trois résultats d'optimisations seront présentés [LEB05a], [LEB05b]. D'abord en utilisant l'approximation diffuse, puis l'interpolation Krigeage avec deux plans d'expérience différents (plan composite et plan enrichi). ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/1044720314757122-1626092141547_Q64/Fabrice-Schmidt.jpg)
![[object Object]](https://i1.rgstatic.net/ii/profile.image/272734559141891-1442036394080_Q64/Nadhir-Lebaal.jpg)
... The optimization involved minimizing the quadratic function obtained. Lebaal et al. [100] determined the geometry of a coat-hanger die using a global response surface method with Kriging interpolation (a regression technique), and Sequential Quadratic Programming (SQP) to minimize the global difference between the local velocities at the die exit and the average value, assuming as a decision variable the depth of the distribution channel and as a restriction the pressure required by the flow. Later, four decision variables were considered, namely the depth and the opening of the channel repartition, the gap, and the height of the relaxation zone [101]. ...
... The RSM consists in the construction of an approximate expression of objective and constraint functions starting from a limited number of evaluations of the real function (numerical analysis). To obtain a good approximation , we used a Kriging interpolation [16, 17] technique. In this method, the approximation is computed by using the evaluation points by composite design of experiments. ...
... As a result, the effect of temperature on flow uniformity was studied in literature. Lebaal et al. [11] optimized wall temperature and flow rate of a wire-coating die with Kriging interpolation and a sequential quadratic programming algorithm optimization method. Their study concluded with the possibility to design a coat-hanger wire-coating die for a different polymer range and flow rates. ...
... The coat hanger die is a commonly used tool in polymer processing industries for extrusion, which is a widely employed procedure to yield high-quality goods [1]. To satisfy the service requirements of the packaging industry, co-extrusion was developed as a method of creating an extrudate from multiple thermoplastic melt streams. ...
... Other researchers have focused on managing this RSM to achieve the global optimum, for example by employing a self-adaptive research space technique. Examples of application where this strategy has proved successful include polymer extrusion [16,17] and clinching optimization problems [18]. Other approximation-based techniques, including Kriging [19][20][21][22], radial basis functions (RBF) [23][24][25][26], multivariable adaptive regression splines (MARS) [26,27], neural networks [28][29][30], and support vector regression [31,32], have also been used to generate the response surfaces for system approximation. ...
... Numerical tools have been proposed to automate die design optimization, combining Finite Element Analysis (FEM) and Flow Analysis Network [19]. Studies using the Finite Volume Method (FVM) aimed to optimize slit extrusion dies, considering temperature effects by imposing temperatures at the inlet and flow channel walls [20,21]. Commercial software like PolyXtrue and Polyflow has been used to simulate polymer extrusion die flow channels [22,23], but the calculations are limited to the flow channel, with certain assumptions at its surface. ...
... extrusion process, while mitigating concerns such as material flow resistance, clogging, and excessive wear (Lebaal et al. 2009;Gbenebor et al. 2013). Additionally, it was observed that extrudates were approximately 6 °C cooler than the programmed band heating. ...
... Numerous approximation techniques, particularly the RSM [12][13][14][15] using a second-order polynomial approximation, have been developed for various optimization problems. Other researchers have focused on managing this RSM to achieve the global optimum, for example by employing a self-adaptive research space technique. ...
... Wu et al. [13] also developed a one-dimensional model that takes into account the effect of temperature variation and its effect on flow uniformity. In another study, Lebaal et al. [14] optimized the wall temperature profile of a coat-hanger extrusion die. By changing wall temperature, viscosity of the fluid in the vicinity of the wall can be changed and consequently flow rate can be manipulated. ...
