Results 211 to 220 of about 1,257 (242)
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Blown Film Extrusion of Post-Consumer Recycled Lldpe Film
Journal of Plastic Film & Sheeting, 1993In 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 +2 more
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Blown Film Extrusion Optimization-Control and Screws
Journal of Plastic Film & Sheeting, 1991On-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
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Optimized cooling and gauge tolerances in blown film extrusion
Polymer Engineering & Science, 1997AbstractNumerical 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
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Studies on blown film extrusion. III. Bubble instability
Journal of Applied Polymer Science, 1975AbstractAn 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
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Lldpe Resins for High Output Blown Film Extrusion
Journal of Plastic Film & Sheeting, 1991We take a closer look at the output rate improvements which can be achieved as a result of the improved melt strength of 0.5 MI resins.
D.L. Cooke, M. Koyich
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Photonic Crystals of Oblate Spheroids by Blown Film Extrusion of Prefabricated Colloidal Crystals
Langmuir, 2009Three-dimensional photonic crystals (or photonic band gap materials) have been fabricated with oblate spheroids as the photonic building block. The nonspherical shape was realized by the blown film extrusion process of a prefabricated colloidal photonic crystal of spherical polystyrene particles, with its voids infiltrated by polyvinyl alcohol.
Tao, Ding +4 more
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The Use of Deformation Rates in the Scale-Up of Polyethylene Blown Film Extrusion
Journal of Plastic Film & Sheeting, 1992It is often desirable to scale up a process from a lab scale system, where most research occurs, to a large scale industrial system with minimal ex penses of time and money. This work will show that under appropriate process ing conditions, blown films can be produced under similar strains that yield comparable crystalline morphologies and therefore ...
David M. Simpson, Ian R. Harrison
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Increased output of blown film extrusion lines by using a cooling sleeve
AIP Conference Proceedings, 2014Production efficiency is one of the most important demands in blown film production. In many cases, the cooling power is the limiting factor for an increased output. A possible solution for a better cooling is the use of a cooling sleeve right after the outlet of the die in addition to the conventional air rings and internal bubble cooling (IBC).
Christian Hopmann +2 more
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A Novel Processing Aid for Greater Flexibility in Blown Film Extrusion
Journal of Plastic Film & Sheeting, 1987The high melt viscosity of linear low density polyethylene (LLDPE) presents several problems, particularly melt fracture, when this resin is processed on blown film equipment which has been designed for use with high pressure, low density polyethylene (LDPE) resin.
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Investigations of film thickness variations in blown film extrusion when using air guiding systems
Journal of Plastic Film & Sheeting, 2020The mass throughput and thus the productivity of a blown film line strongly depends on heat transfer from the film. Existing cooling systems are therefore constantly being further developed. Usually, the film is convectively cooled by cooling rings, coupled with an internal bubble cooling (IBC) system to increase the surface area and the cooling rate ...
Lars Kraus +3 more
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