An electrospraydevice, a liquid chromatography device and an electrospray-liquid chromatography system are disclosed. The plastic card is manufactured by performing the steps of thermally bonding thin synthetic resin layer sheets to form a card sheet, die-cutting the card sheet into a number of rectangular finished cards, and attaching a magnetic tape for recording information on the finished cards or having an IC chip embedded in the finished cards. Data stored on the data storage unit is received via the network and loaded into the volatile system memory of the client system.