空中超音波のコインシデンス効果を利用するヒートシール瑕疵の非接触検出

森 健太, 井上 卓見, 門脇 廉

研究成果: Contribution to journalArticle査読

抄録

<p>Heat sealing is a packaging technique by means of welding of seal materials with heating and compression, and is widely used for hermetic seal of foods and medical supplies. However, a defect of the heat sealing, for example a "pinhole", caused by small wrinkle on the sealing film or jamming by contaminants occasionally arises. In order to enhance the reliability of heat seal products, this study proposes a nondestructive technique to detect such a small defect in the heat seal by utilizing coincidence effect of airborne ultrasound. In the proposed method, a bending wave with sufficient amplitude is excited by the coincidence effect, and this bending wave appears as a traveling wave on the heat seal. This traveling wave is sensitive to the defect in heat seal and shows apparent phase lags compared with defectless heat seal. Therefore, defect in the heat seal is detectable by observation of the phase lags in the traveling wave. Arrangement of ultrasound transmitter and receiver is important for the proposed technique in order to observe the phase lags efficiently. Traveling wave plays an important role to detect the defect in heat seal, so that the airborne ultrasound inspection without the coincidence effect is unavailable because the traveling wave is not generated. Validity of the proposed technique is demonstrated through experiments and numerical simulations.</p>
寄稿の翻訳タイトルNon-contact detection of heat seal defect using the coincidence effect of airborne ultrasound
本文言語日本語
ページ(範囲)19-00381-19-00381
ジャーナル日本機械学会論文集
86
886
DOI
出版ステータス出版済み - 2020

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