Results 161 to 170 of about 867 (213)

Dynamic modeling of blown‐film extrusion

Polymer Engineering & Science, 2003
Abstract Past dynamic studies of blown‐film extrusion have been confined to the stability analysis of the linearized equations. The full set of nonlinear equations comprises a system of partial differential and algebraic equations with boundary conditions that vary from author to author.
J. Carl Pirkle, Richard D. Braatz
openaire   +1 more source

Stability of a Blown Film Extrusion Process

International Polymer Processing, 1999
Abstract The stability of a blown film extrusion process has been investigated using a simple isothermal Newtonian model. Although the Newtonian model may be an oversimplification for polymer melts, it serves as a reasonable first approximation for linear polymers (e.g., linear low density polyethylene) in extensional flow situations ...
K.-S. Yoon, C.-W. Park
openaire   +1 more source

Blown Film Extrusion of Post-Consumer Recycled Lldpe Film

Journal of Plastic Film & Sheeting, 1993
In this work, the properties of blown film made from post consumer recycled material were studied. Post-consumer recycled LLDPE film was blended with a virgin LLDPE resin at several levels in a twin-screw ex truder, and the melt index, storage modulus, and loss modulus of these blends were measured.
S.J. Hebert, C. Tzoganakis, J. Perdikoulias   +2 more
openaire   +1 more source

Fabrication of PBAT/polyethylene blends mulching film via blown film extrusion process

Korea-Australia Rheology Journal, 2020
To extend the period of decomposition and property degradation of polybutylene adipate terephthalate (PBAT) mulching film for long-term use, PBAT was compounded with polyethylene mixture (LDPE: LLDPE = 15:85), calcium carbonate, and illite. PBAT mulching films were prepared using a blown film extrusion process with 80 mm diameter blowing die.
Jung Gu Han, Seung Joon Park
openaire   +1 more source

Studies on blown film extrusion. III. Bubble instability

Journal of Applied Polymer Science, 1975
AbstractAn experimental study has been carried out to investigate flow instabilities in blown film extrusion. Two types of flow instabilities were observed, depending on whether a bubble was under uniaxial or biaxial stretching. Under biaxial stretching, the phenomenon of a surface wave‐type instability was observed, yielding wavy bubble shapes which ...
Chang Dae Han, Jong Yoo Park
openaire   +1 more source

Blown Film Extrusion Optimization-Control and Screws

Journal of Plastic Film & Sheeting, 1991
On-line film gauging, gravimetric feeding, innovations in blown film dies and wind-up equipment, and improved data handling have made pos sible the production of blown film to higher quality standards. However, ade quate cost control and effective material utilization will require even greater uniformity of the process and property performance of the ...
E.W. Veazey, N. Barrera
openaire   +1 more source

Optimized cooling and gauge tolerances in blown film extrusion

Polymer Engineering & Science, 1997
AbstractNumerical calculations of the air flow and heat transport processes in film blowing have been made, considering the turbulence of the air flow. The parameters air mass flow, air temperature, air velocity, and angle‐of‐attack have been varied. The results have shown that the air massflow has the strongest influence on cooling in the processing ...
B. Feron, D. Wolf, J. Wortberg
openaire   +1 more source