Picosecond UV laser induced scribing of polyethylene terephthalate (PET) films for the enhancement of their flexibility

Kang, Min Gi; Kim, Chang-Hwan; Lee, Yong Joong; Kim, Sung Yeol; Lee, Ho

doi:10.1016/j.optlastec.2016.03.001

Cited by 5 publications

(9 citation statements)

References 35 publications

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“…In most of the previous studies on PET processing using ultrashort-pulse lasers, it was reported that non-thermal ablation (cold ablation) occurred. Our team also investigated the micromachining of PET materials using UV picosecond lasers [ 47 ]. In that study, a UV picosecond laser (same repetition rate of 50 kHz), with specifications similar to those in this study, was used.…”

Section: Discussionmentioning

confidence: 99%

“…Based on the cited results, it was predicted that processing close to non-thermal ablation (cold ablation) would be possible with the ultrashort-pulse laser used in this study [ 47 ]. However, the laser processing results in the present work indicated a trend close to thermal ablation (hot ablation), where collateral damage accumulates in the periphery of the laser-induced crater.…”

Section: Discussionmentioning

confidence: 99%

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Surface Characteristics of Polymers with Different Absorbance after UV Picosecond Pulsed Laser Processing Using Various Repetition Rates

Ham

Lee

2020

Polymers

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We experimented with two polymer materials with different ultraviolet (UV) wavelength absorption characteristics, which are commonly used in flexible devices, by applying an ultrashort-pulsed laser of a 355-nm UV wavelength for 10 ps. The laser parameters studied were pulse repetition rate, laser irradiation method, and laser power condition. Previous studies using polyethylene terephthalate (PET), which does not exhibit linear absorption at a UV wavelength, have focused on processing trends resulting in minimal collateral damage around the laser-induced ablation. However, our results showed a trend of accumulating such damage irrespective of the laser parameters. Meanwhile, polyimide (PI) exhibited a completely different behavior depending on the laser parameters. At low pulse repetition rates, minimal collateral damage was observed, whereas at high repetition rates, the morphology varied considerably. The electrical characteristics of the laser-processed materials were found to be correlated with the variations in morphology. In the case of PI, such variations in electrical resistance and morphology indicated that the material was carbonized. The findings of this study are expected to provide a useful reference when selecting parameters for the laser processing of similar polymer materials.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Surface Characteristics of Polymers with Different Absorbance after UV Picosecond Pulsed Laser Processing Using Various Repetition Rates

Ham

Lee

2020

Polymers

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“…Detailed conditions for the laser scribing and bending tests of the PET films were described in the previous article. 16 An ultraviolet (UV) picosecond laser (355 nm, 12 ps, Time-Bandwidth Inc) was used to scribe the PET films. Single or multiple lines (3, 7, and 13 lines) were scribed at the center of the top surface of each film by scanning the laser 10 times per each line at a scanning speed of 2 mm/s.…”

Section: Methodsmentioning

confidence: 99%

“…7 Also, it was experimentally demonstrated that the multiple grooves on a PET film can enhance its local bending curvature without the significant loss of the mechanical resilience of the film. 16 The aim of this study was to develop a PET film with enhanced local flexibility, for a flexible device application. For certain scribing conditions, the PET film failed to return to its original shape after the bending test, mainly due to breakage or large plastic deformation at the tip of the scribed grooves, which can be attributed to the stress concentration.…”

Section: Introductionmentioning

confidence: 99%

Stress/strain and curvature analysis of laser-scribed polyethylene terephthalate films with multiple grooves using finite element method

Heo

Kang

Lee

et al. 2018

Advances in Mechanical Engineering

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Laser scribing can be used to enhance the flexibility of polymer films for flexible device applications. To optimize the bending curvature by controlling the scribing parameters—the depth, number, and interval of the scribed grooves, finite element analysis was conducted on the bending tests of scribed polyethylene terephthalate films. Moreover, the influences of the parameters on the stress/strain near the grooves were investigated. The maximum stress/strain and curvature generally increased with an increase in depth, whereas these values decreased with an increase in number and intervals. However, to maintain the mechanical stability of the films, the parameters were limited. The optimization results revealed that the maximum value of the curvature was 2.6 mm−1 at depth = 40 and intervals = 25 μm, for number = 7. An empirical equation relating the curvature to depth and intervals was also provided. The results of the analysis are useful for the design of laser-scribed grooves on various polymer films, for the enhancement of their bending curvature, while minimizing the mechanical instability.

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“…Although a hybrid of laser beam, water jet coolant and pre-bending were employed to eliminate the micro-cracks [ 9 ], form deviation happened along the beam moving direction. A picosecond Ultraviolet (UV) laser was also used to induce the scribing of polyethylene terephthalate films to control the local bending flexibility [ 10 ], but it has not yet been applied to severing.…”

Section: Introductionmentioning

confidence: 99%

Study on Micro-Crack Induced Precision Severing of Quartz Glass Chips

2018

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It is difficult to cut hard and brittle quartz glass chips. Hence, a method involving micro-crack-induced severing along a non-crack microgroove-apex by controlling the loading rate is proposed. The objective is to realize the rapid and precision severing of the hardest quartz glass in chip materials. Firstly, micro-grinding was employed to machine smooth microgrooves of 398–565 μm in depth; then the severing force was modelled by the microgroove shape and size; finally, the severing performance of a 4-mm thick substrate was investigated experimentally. It is shown that the crack propagation occurred at the same time from the microgroove-apex and the loading point during 0.5 ms in micro-crack-induced severing. The severing efficiency is dominated by the severing time rather than the crack propagation time. When the loading rate is less than 20–60 mm/min, the dynamic severing is transferred to static severing. With increasing microgroove-apex radius, the severing force decreases to the critical severing force of about 160–180 N in the static severing, but it increases to the critical severing force in the dynamic severing. The static severing force and time are about two times and about nine times larger than the dynamic ones, respectively, but the static severing form error of 16.3 μm/mm and surface roughness of 19.7 nm are less. It is confirmed that the ideal static severing forces are identical to the experimental results. As a result, the static severing is controllable for the accurate and smooth separation of quartz glass chips in 4 s and less.

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Picosecond UV laser induced scribing of polyethylene terephthalate (PET) films for the enhancement of their flexibility

Cited by 5 publications

References 35 publications

Surface Characteristics of Polymers with Different Absorbance after UV Picosecond Pulsed Laser Processing Using Various Repetition Rates

Surface Characteristics of Polymers with Different Absorbance after UV Picosecond Pulsed Laser Processing Using Various Repetition Rates

Stress/strain and curvature analysis of laser-scribed polyethylene terephthalate films with multiple grooves using finite element method

Study on Micro-Crack Induced Precision Severing of Quartz Glass Chips

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