Multi-scale phenomena induced by fluoropolymer processing aids during the extrusion of linear-low density polyethylene

Dubrocq-Baritaud, Claire; Darque-Ceretti, Évelyne; Vergnes, Bruno

doi:10.1016/j.jnnfm.2010.09.008

Cited by 13 publications

(18 citation statements)

References 19 publications

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“…The difference in rheological behaviour between PPA and LLDPE has already been shown in the previous study [8]. PPA is highly viscous (around 10 5 Pa s at 1 s À1 and 200°C), with a pronounced shear-thinning behaviour, whereas LLDPE exhibits a classical Carreau type behaviour (around 7 Â 10 3 Pa s at 1 s À1 and 200°C).…”

Section: Polymers Characterizationsupporting

confidence: 66%

“…Experiments were carried out with the extrusion set-up presented in the previous study [8]. PPA actions were studied on a laboratory single-screw extruder Brabender (screw diameter D = 19 mm, L/D = 25) equipped with a slit die with transparent windows and removable inserts (Fig.…”

Section: Extrusion Experimentsmentioning

confidence: 99%

“…Following the method of analyses developed previously [8], the surface coated by PPA deposits on an area of 1.15 Â 0.94 mm 2 was measured by using the backscattering electron detector (BSE) (magnitude Â200). This measurement was automatically repeated until to cover the total die surface of 30 Â 14.6 mm 2 .…”

Section: Post-extrusion Analysesmentioning

confidence: 99%

“…In 2005, Lavallée [7] presented pictures of local fluoropolymer deposits on gold and nickel surfaces. Very recently, we coupled techniques of Scanning Electron Microscopy (SEM) and Laser Doppler Velocimetry (LDV) in a transparent slit die to quantify and to follow the deposits of PPA step by step on the whole die surface [8]. We demonstrated that wall slip was spatially heterogeneous and directly correlated to the local surface density of coating.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, we will present studies on the influence of die surface properties, using the measurement techniques developed previously [8]. In the first part, materials and methods will be detailed.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Influence of die surface on the efficiency of fluoropolymer processing aids during the extrusion of linear-low density polyethylene

Dubrocq-Baritaud

Darque-Ceretti²,

Vergnes³

2011

Journal of Non-Newtonian Fluid Mechanics

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Section: Polymers Characterizationsupporting

confidence: 66%

Section: Extrusion Experimentsmentioning

confidence: 99%

Section: Post-extrusion Analysesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of die surface on the efficiency of fluoropolymer processing aids during the extrusion of linear-low density polyethylene

Dubrocq-Baritaud

Darque-Ceretti²,

Vergnes³

2011

Journal of Non-Newtonian Fluid Mechanics

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Rotating die technique for sharkskin minimization in highly viscous wood/PP composite melt in an extrusion die

Kaiyaded

Wimolmala

Harnnarongchai

et al. 2012

J of Applied Polymer Sci

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This study used a newly developed rotating die system for purposes of reducing entrance pressure drop and sharkskin fracture for molten polypropylene (PP) and wood/polypropylene (WPP) composites in a single‐screw extruder. The sharkskin fracture characteristics of the PP and WPP composite surfaces were examined quantitatively via roughness profiles and relaxation time evaluations, and qualitatively through scanning electron microscopy under the effects of wood content, shear rate, die temperature, and die rotation speed. The experimental results suggested that the entrance pressure drop of PP increased with increasing wood content and shear rate. The die entrance pressure drop for WPP composite melt with 30 wt % wood content could be minimized by 20–50% by using a die rotation speed of 70 rpm. The roughness level (sharkskin) and relaxation time were found to increase with increasing wood content, but could be minimized by rotating the die—the die rotating effect being more meaningful for WPP when compared with neat PP extrudate. The rotating die system was found to be an effective technique for minimizing the extrusion load and fracture level of extrudate skins for high‐viscosity materials such as the WPP composites used in this work. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

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Flow Instabilities

Agassant,

Avenas,

Vincent

et al. 2017

Polymer Processing

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Multi-scale phenomena induced by fluoropolymer processing aids during the extrusion of linear-low density polyethylene

Cited by 13 publications

References 19 publications

Influence of die surface on the efficiency of fluoropolymer processing aids during the extrusion of linear-low density polyethylene

Influence of die surface on the efficiency of fluoropolymer processing aids during the extrusion of linear-low density polyethylene

Rotating die technique for sharkskin minimization in highly viscous wood/PP composite melt in an extrusion die

Flow Instabilities

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