<style type="text/css">
    @media print {
      .noprint { display: none; }
    }
  </style>

http://martybugs.net/articles/print.cgi

From this article, Martin "mpot" Pot mention:

" The above CSS definition is defining a style called noprint, and will only be applied to printed content. Setting the display property to none means any content using this CSS style will not be displayed when printed, but will be displayed for all other media types. "

CSS class for not displaying tag groups in print pages

class

CSS