(One reason I want a new window is, it has to contain the table only, because I don't want any thing else like navigation controls being included in any printout, and I don't want the user to have to click the browser's back button to get back to the main window.)

How about a print stylesheet that hides the parts of the page that should not be printed? That way, you don't need to reload anything. Just have your users use the usual print function of the browser.

Something like this should get you started:

@media print {
   .navigation,
   .header,
   .footer { 
        display: none; 
   }
}
[download]

Some of the first Google results: https://www.smashingmagazine.com/2018/05/print-stylesheets-in-2018/, https://www.smashingmagazine.com/2011/11/how-to-set-up-a-print-style-sheet/, https://www.sitepoint.com/css-printer-friendly-pages/

To avoid wasting paper, you may want to install a PDF "printer" driver, e.g. PDFCreator.

Alexander