A carton blank is etched with a laser to remove at least a portion of a coating material on a glue panel area of the carton blank. The laser-etching process allows the use of cold-resin or other standard glue in manufacturing a carton from the carton blank, instead of a more expensive specialized glue...http://www.google.com.tw/patents/US6632163?utm_source=gb-gplus-share專利 US6632163 - Laser-etching of paperboard carton blanks
