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Orderly Perforation of Polyester Films by Excimer Laser

Li, Wenqi
http://rave.ohiolink.edu/etdc/view?acc_num=akron1418332319

Abstract Details

2014, Master of Science in Polymer Engineering, University of Akron, Polymer Engineering.
The effects of 248 nm KrF excimer laser irradiation on combinations of different thickness PET films and different stainless steel mask mesh opening sizes were considered as a possible method to achieve different size perforations on different thickness PET films, in order to provide an effective and controllable perforation technology. Therefore, ablation behavior of PET films has been investigated for different laser energy fluence and number of laser pulses. Morphology of irradiated samples was observed by optical microscopy, and atomic forced microscopy to study topography and microstructures after laser ablation. An attempt has been made of correlate these findings with the orientation, strength and mechanical properties of the polymer. The experimental results reveal that the percentage of perforation and the average perforated area increase with increasing number of pulses for all film thicknesses. The affected area, defined as the perforated area plus the heat affected zone (a black-char- region around the perforated area) decrease with increasing number of pulses. Due to the heat conducted from the steel mash wire, especially at cell corners, the perforation process seems to start initially at the cell corners. High laser fluence seems to lead to surface depressions due to thermal shock and surface stress waves along the process directions confirmed by tensile testing and x-ray analyses. The presence and the geometry of surface depressions were confirmed by atomic forced microscopy.
Erol Sancaktar, Dr. (Advisor)
Kevin Cavicchi, Dr. (Committee Member)
Chang Ye, Dr. (Committee Member)
82 p.
Engineering; Materials Science; Mechanical Engineering; Polymer Chemistry; Polymers
Excimer Laser, PET film, Perforation

Recommended Citations

Citations

  • Li, W. (2014). Orderly Perforation of Polyester Films by Excimer Laser [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1418332319

    APA Style (7th edition)

  • Li, Wenqi. Orderly Perforation of Polyester Films by Excimer Laser . 2014. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1418332319.

    MLA Style (8th edition)

  • Li, Wenqi. "Orderly Perforation of Polyester Films by Excimer Laser ." Master's thesis, University of Akron, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1418332319

    Chicago Manual of Style (17th edition)

akron1418332319
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© 2014, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.