Evaluation of drinking ease relative to the opening diameter and beverage type of aluminum beverage bottles

This paper investigates the effects of different bottle opening sizes (28, 33, and 38 mm in diameter) and beverage types (e.g. green tea, carbonated beverages) on the drinking satisfaction of consumers, in order to enhance their comfort levels when drinking from aluminum beverage bottles. A survey of 120 Japanese subjects was conducted, and the 33 mm opening size emerged as the most preferred, irrespective of beverage type. The factor analysis results of the questionnaire show that drinking satisfaction is primarily affected by two common factors: the volume of flow from the bottle to the mouth and the adjustability of the flow. The results of the three-dimensional fluid-dynamics analysis indicate that differences in beverage type could influence what consumers regard as an appropriate flow.