There is no train running directly to Pudong Airport from Hangzhou. If you’d like to go to Pudong Airport directly, you can take the airport bus from Wulin Gate, which takes around 3hrs. Personally, you could take a G train to Shanghai Hongqiao Station by 1hr and then take the subway line 2 to Pudong airport. And many G-trains are available from Hangzhou to Shanghai. You can search the train schedule in details on the website.