S1304-2-3 透明樹脂同士のレーザ溶着における接合面凹凸形状とレーザ光吸収率の関係([S1304-2]微細放電加工およびその他の加工法)

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This paper investigates the relationship between surface profile and laser absorptivity in laser welding of transparent thermoplastic resin parts in order to clarify the desirable profile which provides high laser absorptivity. A diode laser with 920 nm wavelength was used for laser irradiation and PMMA was used as a test piece. Sandblasting and hot pressing were used as the preprocessing method to form the roughness and the surface of the test pieces was observed using scanning electron microscope (SEM). Laser absorptivity of each test piece was also measured. It is found that surface on which squarish asperities 5 μm on a side, as well as small asperities less than 1 jam size, provides high laser absorptivity.
2010-09-04