Isothermal and Anisothermal Models for Cast Film Extrusion

1992 ◽  
Vol 7 (4) ◽  
pp. 334-349 ◽  
Author(s):  
P. Barq ◽  
J. M. Haudin ◽  
J. F. Agassant
Keyword(s):  
Film Extrusion ◽  
Cast Film

Cast Film Extrusion of Polypropylene Films

1989 ◽  
Vol 4 (2) ◽  
pp. 103-113 ◽  
Author(s):  
D. Cotto ◽  
P. Duffo ◽  
J. M. Haudin
Keyword(s):  
Film Extrusion ◽  
Cast Film ◽  
Polypropylene Films

Distributed Crystallinity Control during Cast Film Extrusion

1997 ◽  
Vol 12 (4) ◽  
pp. 373-377 ◽  
Author(s):  
T. Leephakpreeda ◽  
C. Batur
Keyword(s):  
Film Extrusion ◽  
Cast Film

Cast Film Extrusion

2005 ◽  
Vol 20 (2) ◽  
pp. 136-148 ◽  
Author(s):  
J. F. Agassant ◽  
Y. Demay ◽  
C. Sollogoub ◽  
D. Silagy
Keyword(s):  
Film Extrusion ◽  
Cast Film

Simulation of Liquid Crystal Polymer Directionality During Cast Film Extrusion

2018 ◽  
Author(s):  
Anthony Sullivan ◽  
Anil Saigal ◽  
Michael A. Zimmerman
Keyword(s):  
Liquid Crystal ◽  
Bulk Material ◽  
Hybrid Approach ◽  
Industrial Applications ◽  
Melt Processing ◽  
Liquid Crystal Polymers ◽  
Film Extrusion ◽  
Cast Film ◽  
Orientation State ◽  
Degree Of Orientation

Liquid crystal polymers (LCP’s) comprise a class of melt-processable materials that derive specialized mechanical, chemical, and electrical properties from long-range molecular ordering. This unique microstructure gives rise to anisotropic bulk behavior that can be problematic for industrial applications, and thus the ability to model the orientation state in the polymer is necessary for the design of isotropic material manufacturing processes. Previous efforts to model LCP directionality have been primarily restricted to structured grids and simple geometries that demonstrate the underlying theory, but fall short of simulating realistic manufacturing geometries. In this investigation, a practical methodology is proposed to simulate the director field in full-scale melt-processing set-ups, specifically cast film extrusion, to predict the bulk material orientation state. The hybrid approach utilizes separate simulations for the polymer flow with commercial computational fluid dynamics (CFD) software, and the material directionality through a user-defined post-processing script. Wide-angle x-ray scattering (WAXS) is used to experimentally validate the simulated directionality during extrusion processing. It is shown that the model is capable of predicting both the direction and degree of orientation in the polymer resulting from processing, and the model produces strong agreement with experimental measurement of the polymer orientation state.

scholarly journals Systematic Investigation on the Structure-Property Relationship in Isotactic Polypropylene Films Processed via Cast Film Extrusion

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1636 ◽  
Author(s):  
Federico Di Sacco ◽  
Markus Gahleitner ◽  
Jingbo Wang ◽  
Giuseppe Portale
Keyword(s):  
Isotactic Polypropylene ◽  
Single Site ◽  
Random Copolymers ◽  
Minor Effect ◽  
Structure Property ◽  
Melt Temperature ◽  
Film Extrusion ◽  
Line Speed ◽  
Cast Film ◽  
Roll Temperature

The effect of cast film extrusion processing conditions, such as the chill-roll temperature, temperature of the melt, and line speed, on the structure of different isotactic polypropylene homo- and random copolymers has been investigated by means of Small- and Wide-Angle X-ray Scattering (SAXS and WAXS) and correlated to stiffness and haze. Stiffness and transparency have been found to be strongly dependent on the temperature of the chill-roll. Interestingly, line speed has been found to affect the total crystallinity when the chill-roll temperature is increased, while an overall minor effect of the melt temperature was found for all cast films. The polymer characteristics, defined by the catalyst nature and comonomer content, affect the final material performance, with the single-site catalyzed grades performing better in both mechanics and optics. Haze levels were found to correlate with the mesophase content rather than to α-crystallinity and to be dependent on the domain size for all grades. The remarkably low haze levels reached by the single-site grade with higher isotacticity can arise from high nucleation rate and orientational effects, which ultimately yield smaller and smoother scattering domains.

Influence of Stretching and Cooling Conditions in Cast Film Extrusion of PP Films

1990 ◽  
Vol 5 (4) ◽  
pp. 272-283 ◽  
Author(s):  
P. Duffo ◽  
B. Monasse ◽  
J. M. Haudin
Keyword(s):  
Film Extrusion ◽  
Cooling Conditions ◽  
Cast Film
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