Applied Rheology: Publications
M.Zatloukal, J. Vlcek, A. Slanik, A. Lengalova, J. Simonik
Experimental and numerical investigation into metallocene polymer melt flow in film blowing dies

Appl. Rheol. 12:3 (2002) 126-132

Abstract: A frequent problem in the production of metallocene linear low-density polyethylene (mLLDPE) films is the occurrence of flow instabilities, e.g. sharkskin, or degradation of material, which limit the production rate and decrease the product quality. If such problems arise, the question is what causes these phenomena and how they can be avoided. With the aim of understanding these problems and providing some guidelines for their suppression, rheological measurements together with modelling of these melt flows are often employed. In the present study, flow behaviour of two commercially available mLLDPEs was determined and used for the process simulation. The paper shows that the capillary-rheology data together with 2D finite element method can be used for the prediction of sharkskin phenomenon as well as degradation of mLLDPE melts in film blowing dies. It also reveals that the degradation of the materials in these dies can be quantified through wall shear stress. Finally, the paper describes how these findings can help optimize the flow channel in the film blowing die to avoid the undesirable flow phenomena. © 2002 Applied Rheology.

DOI 10.3933/ApplRheol-12-126

-- full text PDF available for subscribers --

-- open access PDF extract available for non-subscribers --

You have no password-free access to Applied Rheology Online. If you are a subscriber, enter login details below. For password-free access, we need your IP address. Sample manuscripts for free download can be found here

download to disk (some browsers prefer this option)
login name

Purchase this article for 20 € ?

Forgotten your login details? Send an email with subject "AR login" to

Appl Rheol 12 (2002) issues:


© Applied Rheology 2018