materio-base-d7/sites/all/themes/gui/materiobasetheme/preprocess/print.pre.php

<?php 

// print '<pre>';
// print_r($vars);
// print '</pre>';


$vars['print']['site_name'] = variable_get('site_name', '');
$vars['print']['site_slogan'] = variable_get('site_slogan', '');

$site_title = array();
// $site_title[] = $vars['print']['title'];
$site_title[] = $vars['print']['site_name'];
$site_title[] = $vars['print']['site_slogan']; 

$vars['print']['site_title'] = implode(' | ', $site_title);