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A study of the factors effecting lay...

Ghumman, Bhavjit Singh.

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A study of the factors effecting layer thickness uniformity and layer breakup in microlayered coextruded films.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	A study of the factors effecting layer thickness uniformity and layer breakup in microlayered coextruded films./
Author:	Ghumman, Bhavjit Singh.
Description:	107 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-11, Section: B, page: 6252.
Contained By:	Dissertation Abstracts International66-11B.
Subject:	Engineering, Materials Science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3195943
ISBN:	9780542418273

A study of the factors effecting layer thickness uniformity and layer breakup in microlayered coextruded films.
Ghumman, Bhavjit Singh.

A study of the factors effecting layer thickness uniformity and layer breakup in microlayered coextruded films. - 107 p.

Source: Dissertation Abstracts International, Volume: 66-11, Section: B, page: 6252.

Thesis (D.Eng.)--University of Massachusetts Lowell, 2005.

Microlayer coextrusion offers the opportunity to economically commercialize the production of nanometer thick film. A major obstacle towards commercialization is the non-uniform thickness of these layers and their breakup into droplets, which is also known as a scattering instability. Prior research had indicated a strong interaction between material properties and process parameters. Therefore, the focus of this research effort was to better understand and then identify the coextrusion parameters and material properties that governed the layer non-uniformity and scattering.

ISBN: 9780542418273Subjects--Topical Terms:

1017759
Engineering, Materials Science.

A study of the factors effecting layer thickness uniformity and layer breakup in microlayered coextruded films.
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005 20110523
008 110523s2005 ||||||||||||||||| ||eng d
020 $a 9780542418273
035 $a (UMI)AAI3195943
035 $a AAI3195943
040 $a UMI $c UMI
100 1 $a Ghumman, Bhavjit Singh. $3 1270288
245 1 2 $a A study of the factors effecting layer thickness uniformity and layer breakup in microlayered coextruded films.
300 $a 107 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-11, Section: B, page: 6252.
500 $a Supervisor: Carol Forance Barry.
502 $a Thesis (D.Eng.)--University of Massachusetts Lowell, 2005.
520 $a Microlayer coextrusion offers the opportunity to economically commercialize the production of nanometer thick film. A major obstacle towards commercialization is the non-uniform thickness of these layers and their breakup into droplets, which is also known as a scattering instability. Prior research had indicated a strong interaction between material properties and process parameters. Therefore, the focus of this research effort was to better understand and then identify the coextrusion parameters and material properties that governed the layer non-uniformity and scattering.
520 $a Initial studies had indicated that there existed an interaction between the two extruders, which gave rise to pressure fluctuations and non-uniform flow. The interaction of the two extruders was studied by analyzing the pressure signals at the two extruders and the junction of the two streams. A response surface method was used to analyze the two extruders individually, the number of layer multiplying elements and finally the interaction between the two extruders and the effect they had on pressure, surging, flow rate and torque. Although the interaction of the two extruders did result in higher backpressures, it did not decrease the output. The output was independent of the screw speed of the other extruder, however it did influence the melting mechanics along the screw. The more shear sensitive PMMA showed a greater degree of sensitivity than the Newtonian PC.
520 $a The influence of primary; coextrusion, and secondary; chill roll, processing on the final layer thickness was studied in a second set of experiments. For this purpose primary coextrusion process parameters such as screw speed ratio, die temperature and core melt temperature were changed and the effect on the layer thickness uniformity was studied. Similarly secondary process parameters such as nip gap and chill roll speed were also investigated. Thickness was measured using an Atomic Force Microscope (AFM). The screw speed ratio was the most important primary process variable in controlling the layer thickness. Chill roll velocity was an important process variable used to control layer thickness. These two process parameters also showed the greatest layer uniformity at screw speed ratios of unity and very high chill roll speeds.
520 $a Researchers have speculated that scattering is controlled by the same factors that governs droplet breakup in blend systems. The primary factors identified by them were the thickness of the layers, the interfacial tension and the number of layers. A 23 level full factorial DOE was carried out and the thickness of the samples measured using FMM. (Abstract shortened by UMI.)
590 $a School code: 0111.
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Plastics Technology. $3 1023683
690 $a 0794
690 $a 0795
710 2 $a University of Massachusetts Lowell. $3 1017839
773 0 $t Dissertation Abstracts International $g 66-11B.
790 $a 0111
790 1 0 $a Barry, Carol Forance, $e advisor
791 $a D.Eng.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3195943