Optimization of Process Parameters Based on 355 nm UV Laser Cutting of Flexible Copper Clad Laminates

Wenxin Liu; Zhicheng Chen; Yan Li; Guangyu Chen; Liuqing Huang; Xuetao Luo

doi:10.3788/CJL220985

Chinese Journal of Lasers, Volume. 50, Issue 8, 0802103(2023)

Optimization of Process Parameters Based on 355 nm UV Laser Cutting of Flexible Copper Clad Laminates

Wenxin Liu^1,2, Zhicheng Chen^1,2, Yan Li¹, Guangyu Chen¹, Liuqing Huang¹, and Xuetao Luo^1、*

¹College of Material, Xiamen Key Laboratory of Electronic Ceramic Materials and Devices, Xiamen University, Xiamen 361005, Fujian , China

²Xiamen Apson Electronic Technology Co., Ltd., Xiamen 361101, Fujian , China

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Figures & Tables(16)

Fig. 1. Photo and layered structure of flexible copper clad laminate (FCCL)

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Fig. 2. Laser cutting process diagram

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Fig. 3. Relationship between actual output energy per unit length of FCCL and average cutting speed

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Fig. 4. Surface of FCCL at different average scanning speeds

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Fig. 5. Distribution of carbon element on FCCL surface at different average cutting speeds. (a) SEM images; (b) EDS patterns

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Fig. 6. Variation of slit width of FCCL under different cutting power and repeated cutting times

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Fig. 7. Average slit width of FCCL under different cutting powers

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Fig. 8. Cross-sectional morphologies of FCCL under different cutting powers

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Fig. 9. EDS analysis diagrams of FCCL section under different cutting powers. (a) 10.5 W; (b) 12 W; (c) 13.5 W

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Fig. 10. Laser/FCCL interaction mechanisms under different cutting speeds, where the left and right diagrams represent high- and low- speed cutting, respectively

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Table 1. Laser cutting machine use environment and requirements
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Table 1. Laser cutting machine use environment and requirements
Project Reference value
Power supply 380 V（AC）, 50 or 60 Hz
Foundation amplitude /μm <5
Ambient temperature /℃ 25±3
Ambient humidity 50%-60%
Dust-free grade Level 10000

Table 2. Assessed parameters for 355 nm UV nanosecond laser cutting FCCL
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Table 2. Assessed parameters for 355 nm UV nanosecond laser cutting FCCL
Parameter Assessed value
Cutting power factor 70%（minimum）
Scanning speed /（mm·s^-1） 1000-2000
Scanning times 50（minimum）

Table 3. Experimental parameters

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Table 3. Experimental parameters

Parameter	Selected value
Wavelength λ /nm	355
Pulse duration P_d /ns	40
Focal length F /mm	100
Scanning speed V /（mm·s^-1）	1000, 1500, 2000
Repetition frequency /kHz	120
Power P /W	15
Power factor P_F	70%, 80%, 90%
Scanning times N	50, 60, 70

Table 4. Critical cutting energy for different cutting parameters

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Table 4. Critical cutting energy for different cutting parameters

Parameter	Critical cutting energy /（J·mm^-1）
Parameter	P=10.5 W	P=12 W	P=13.5 W
V=2000 mm·s^-1, N=50	0.2625	0.3000	0.3375
V=2000 mm·s^-1, N=60	0.3150	0.3600	0.4050
V=1500 mm·s^-1, N=50	0.3500	0.4000	0.4500
V=2000 mm·s^-1, N=70	0.3675	0.4200	0.4725
V=1500 mm·s^-1, N=60	0.4200	0.4800	0.5400
V=1500 mm·s^-1, N=70	0.4900	0.5600	0.6300
V=1000 mm·s^-1, N=50	0.5250	0.6000	0.6750
V=1000 mm·s^-1, N=60	0.6300	0.7200	0.8100
V=1000 mm·s^-1, N=70	0.7350	0.8400	0.9450

Table 5. Five times cutting with different parameters (power factor is a constant value)
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Table 5. Five times cutting with different parameters (power factor is a constant value)
Cutting No. P_F V/（mm·s^-1） N $\bar{V}$ /（mm·s^-1）
First cutting 70% 1000 70 14.28
Second cutting 70% 1000 60 16.67
Third cutting 70% 1000 50 20.00
Fourth cutting 70% 1500 50 30.00
Fifth cutting 70% 2000 50 40.00

Table 6. Five times cutting with different parameters (scanning speed is a constant value)
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Table 6. Five times cutting with different parameters (scanning speed is a constant value)
Cutting No. P /W V /（mm·s^-1） N $\dot{P}$ /W
First cutting 10.5 2000 50 525
Second cutting 10.5 2000 60 630
Third cutting 10.5 2000 70 735
Fourth cutting 12.0 2000 50 600
Fifth cutting 13.5 2000 50 675

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Wenxin Liu, Zhicheng Chen, Yan Li, Guangyu Chen, Liuqing Huang, Xuetao Luo. Optimization of Process Parameters Based on 355 nm UV Laser Cutting of Flexible Copper Clad Laminates[J]. Chinese Journal of Lasers, 2023, 50(8): 0802103

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