Social robots are being increasingly employed in service encounters at hotels. This study explored the possibility that social robots can engage in heartwarming interactions with hotel customers. A collaboration design known as 'Continuous Hospitality with Social Robots' , in which social robots compensate for gaps in hospitality through heartwarming interaction, was evaluated. A field test was conducted in which social robots engaged in heartwarming interaction with customers in a public area of a hotel and then collected customers' impressions of the social robots and overall service via a questionnaire and an interview. The results demonstrate social robots' potential for engaging in heartwarming interactions that enhance overall customer satisfaction through the use of the 'Continuous Hospitality with Social Robots' collaboration design. An exploratory analysis suggests that the perceived impressions of the interaction with social robots are influenced by customer gender and the duration of interactions. Furthermore, the results suggest that social robots could be utilized in other roles at hotels, namely effective advertisement through heartwarming interaction and mental support for employees who do not interact with customers.

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Biaxially oriented polypropylene films are widely used for food packaging and industrial films. Recently machine speed has been increasing in order to obtain higher production rate and film thickness has become thinner to reduce the environmental load. The customers' requirements for better production ability and thinner films have been becoming more demanding, but their demands are not always met due to lack of film stretchability in the final product. In order to meet the demands, research on stretchability has been conducted with the goal of finding the optimum polypropylene molecular structure for developing a new product by analyzing stretching force-strain data using a table tenter which was thought to be the parameter of stretchability.It was found that low crystallinity and wide molecular weight distribution were effective in improving the stretchability from the table tenter test. By running the test with a sequential and biaxially oriented stretching machine, it was verified that samples produced by the above designed polymer indicated good thickness uniformity which was considered to be the barometer of stretchability. Furthermore, it was concluded that analyzing the stretching force-strain data obtained from a table tenter is a good method to predict machine speed and film thickness.

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