Results 251 to 260 of about 2,049 (283)

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
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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
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Lldpe Resins for High Output Blown Film Extrusion

Journal of Plastic Film & Sheeting, 1991
We 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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Foam Extrusion of PS Blown with a Mixture of HFC-134a and Isopropanol

Cellular Polymers, 2004
Use of mixtures of blowing agents in foam extrusion has gained interest in the past few years. Reasons for blending physical foaming agents (PFA) are numerous. The incentives may be economical, environmental or technical. With respect to that latter factor, blending suitable PFAs is often regarded as providing a better control of processing conditions.
Richard Gendron, Caroline Vachon, Michel F. Champagne, Yadi Delaviz   +3 more
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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

Photonic Crystals of Oblate Spheroids by Blown Film Extrusion of Prefabricated Colloidal Crystals

Langmuir, 2009
Three-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, Zhan-Fang, Liu, Kai, Song, Koen, Clays, Chen-Ho, Tung   +4 more
openaire   +2 more sources

Biodegradable PLA-PHA Polymer Blown Extrusion Processing Properties

Korea Industrial Technology Convergence Society
As delivery culture grows rapidly, global regulations on disposable products and packaging materials are being strengthened. The use of various chemical additives and polyvinyl chloride (PVC) plasticizers in the packaging material manufacturing process has been confirmed to cause water pollution and microplastics.
Dae-Yong Jeong, Ji-Yeon Hahm
openaire   +1 more source

The Use of Deformation Rates in the Scale-Up of Polyethylene Blown Film Extrusion

Journal of Plastic Film & Sheeting, 1992
It 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, 2014
Production 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, Christian Windeck, Marco Hennigs   +2 more
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A Novel Processing Aid for Greater Flexibility in Blown Film Extrusion

Journal of Plastic Film & Sheeting, 1987
The 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.
openaire   +1 more source