A bag maker-packaging machine uses three heaters to make bags, one for longitudinal sealing and two for transverse sealing. A device for automatically setting the temperatures of these three heaters includes a memory which stores temperature data from which an operator can retrieve a standard...http://www.google.com.hk/patents/US5715645?utm_source=gb-gplus-share專利 US5715645 - Device for setting seal temperatures and packaging machine provided with same 
