Evaluation of stresses in a two-layer co-extruded LDPE melt blown film

E. Gamache (1) , Jean-François Agassant (2) , Yves Demay (3) , P. G. Lafleur (1)

1 CRASP - Chemical Engineering Department
2 CEMEF - Centre de Mise en Forme des Matériaux
3 INLN - Institut Non Linéaire de Nice Sophia-Antipolis

Despite the fast growth of co-extruded film production, little research work has been devoted to this process. Films of LDPE, ULDPE, LDPE/ULDPE and ULDPE/LDPE were produced at various processing conditions. A continuous experimental set up was used to evaluate the in-plane birefringence during bubble formation. The data collected were used to derive the axial and transverse stresses. A non-isothermal Newtonian model that allows the determination of the kinematics and dynamics of the two-layer film blowing process was then used to calculate the axial and transverse stress. Generally the calculated stresses are in agreement with the experimental values.

Mots clés: VISCOELASTIC ANNULAR FILM; LOW-DENSITY POLYETHYLENE; UNSTEADY EXTRUSION; TUBULAR FILM; MODEL; FLOW

Domaines: Génie mécanique [physics.class-ph]

E. Gamache, Jean-François Agassant, Yves Demay, P. G. Lafleur. Evaluation of stresses in a two-layer co-extruded LDPE melt blown film. Journal of Plastic Film and Sheeting, 2005, 21 (2), pp.127-144. ⟨hal-00079219⟩