The surface modification by atmospheric pressure barrier discharge is effective in the improvement of adhesion performance of plastics. Remote plasma processing has several advantages over direct plasma processing. It is free from the problem of surface damage and charge accumulation and has larger freedom of setup of the system. However, it is necessary to improve the processing performances such as range of remote processing distance, reduction of contact angle, and so on.In this paper, we have investigated processing performances of the remote surface reforming. We used polyethylene film as the reforming object. It was found that the following are very effective as processing conditions: (1) use of nitrogen gas, (2) high-speed gas flow, and (3) longer processing time.
SUMMARYThe surface modification by atmospheric pressure barrier discharge is effective in the improvement of adhesion performance of plastics. Remote plasma processing has several advantages over direct plasma processing. It is free from the problem of surface damage and charge accumulation and has larger freedom of setup of the system. However, it is necessary to improve the processing performances such as range of remote processing distance, reduction of contact angle, and so on.In this paper, we have investigated processing performances of the remote surface reforming. We used polyethylene film as the reforming object. It was found that the following are very effective as processing conditions: (1) use of nitrogen gas, (2) high-speed gas flow, and (3) longer processing time.
To study the formation mechanism of laser-induced periodic surface structures, we carried out a pulse-by-pulse optical observation of laser-induced surface morphological changes on thin glass substrates. We adopted oil-immersion microscopy, which has a higher spatial resolution than dry microscopy, and the laser was irradiated from the air side. A thin transparent substrate of coverslip was used as the sample. When a scratched coverslip was irradiated with focused subnanosecond laser pulses of 1.064 µm wavelength, periodic structures occasionally appeared in the flat region near the focus, with a period of about 0.55 μm.
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