... plastic foam sealing, PVC blister welding, PVC plastic blister welding, battery packaging sealing, hardware tools sealing, PETG blister sealing, blister cardboard sealing, USB packing sealing ... , double blister sealing, PVC double blister sealing, double-sided board blister sealing, cardboard blister sealing, plastic heat sealing and welding.high frequency blister packaging for double ...