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Disposable diapers (“hereinafter, diapers”) have become indispensable for childcare in Japan. According a 2010 survey [1], the conversion rate from cloth diapers to disposable diapers has reached 95%. Furthermore, the production quantity of diapers for infants and young children is trending up despite the downward trend in Japan’s birth rate, as a result of prolonged diaper use as well as of increased demand in various Asian countries including China [2]. Diapers are generally comprised of (1) top sheet that contacts with the skin, (2) super absorbent polymer (SAP) that absorbs urine and (3) back sheet to prevent leakage of urine (Fig. 1). It is not an exaggeration to say that in particular, research and development of SAP significantly contributes to the development of diapers. Excellence in water absorption performance, moisture permeability, antimicrobial property, and texture has been achieved with highly-functional polymer, and diapers are indispensable in the scenes of nursing care and childcare at present. However, troubles relating to diapers are still reported despite the fact that highly-functional materials have been developed. Representative problems include skin irritation such as rash due to wet conditions, side leakage around the crotch and waist, discomfort due to insufficient flexibility of diapers, etc. [3-4]. It is difficult to solve these problems simply by developing highlyfunctional materials, and it is necessary to develop products by comprehensively understanding physiological characteristics of skin, thermal environment between diaper and skin, morphological characteristics of the waist, etc. However, since there is very narrow space between diaper and skin, there is no study that quantitatively analyzed the inside condition of diapers worn in the past and diapers are often designed in accordance with qualitative data in the scenes of product development. Examples that applied computer simulation to diaper design have been rarely reported, although CAE including computer simulation is the trend of product development in recent years [6-7]. Therefore, the purpose of this study is to predict the inside condition of diapers while worn by using computer Prediction of Diaper Shape While Worn by Using Finite Element Method Focus on Posture of Open Legs Wearing Tape-Type Baby Disposable Diaper -

Prediction of Diaper Shape While Worn by Using Finite Element Method―Focus on Posture of Open Legs Wearing Tape-Type Baby Disposable Diaper―