Abstract
This paper clarified the effect of mold temperature affecting adhesion of thermoplastic resins which will be used in Carbon-Fiber-Reinforced Thermo-Plastic (Thermoplastic CFRP). CFRP which has high mechanical strength and lightness attracts considerable attention because of its possibility improving fuel economy. Many vehicle companies are developing new press molding method using Thermoplastic CFRP for achieving high productivity compared to Thermosetting CFRP which is used conventionally. One of the most important factors during press molding is mold temperature which affects adhesion between thermoplastic resins and mold surface. It is important to estimate the adhesion because strong adhesion causes long cycle time and poor surface quality. Adhesion tests were carried out at several mold temperature. Maximum adhesion strength of amorphous resins which consisted of Acrylic resin, Polycarbonate and Polyvinyl chloride were gotten around 126 degree Celsius, 163 degree Celsius and 82 degree Celsius, respectively. Maximum adhesion strength of crystalline resins which consisted of Polyamide 6, Polyamide 66 and Polypropylene were observed around 210 degree Celsius, 236 degree Celsius and 167 degree Celsius, respectively. We clarified amorphous and crystalline thermoplastic resins showed maximum adhesion strength around glassy transition temperature and melting point from the result organized by temperature index which is calculated from dividing mold temperature by glassy transition temperature and melting point, respectively.
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