Materials Transactions Online

Materials Transactions, Vol.53 No.02 (2012) pp.291-295
© 2012 The Japanese Society for Non-Destructive Inspection

Variation in Pressure in Liquid-Filled Plastic Film Bags Subjected to Drop Impact

Kenta Watanabe1, Eisaku Umezaki1 and Katsunori Futase2

1Department of Mechanical Engineering, Nippon Institute of Technology, Minami Saitama gun, Saitama 345-8501, Japan
2Yushin Co. Ltd., Sanjo 955-0002, Japan

The side-wall pressure in liquid-filled plastic film bags subjected to drop impact was measured using pressure sensors, and the relationship between the variation in pressure with time and the number of heat-sealed sides of the bag was investigated. The two samples A and B [130 × 300 mm2 (width × height)] made of transparent plastic film of 67 µm thickness were used. Sample A was a liquid-packaging bag heat-sealed at four sides, and sample B heat-sealed at three sides. The bags contained about 1,000 mL of liquid. Pressure sensors were placed at 26 positions along the inner wall surface of the bag. The samples were held at a height of 0.5 m and freely dropped onto wood floor, aluminum alloy, rubber and sponge plates on a concrete floor. The bottom drop test was carried out. Results indicate that the propagation speed of pressure is affected by the number of heated-sealed sides of the bag, and the maximum pressure by the type of floor material.

(Received 2009/11/11; Accepted 2011/03/11; Published 2012/01/25)

Keywords: liquid-packaging bag, plastic film, drop impact, impact pressure, experimental mechanics

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