초록 ▼

A machine and method for making bags is described and includes a web traveling from an input section to a rotary drum, to an output section. The rotary drum includes at least one seal bar, having a single sealing zone, and a weakening zone disposed within the single sealing zone. The single sealing

A machine and method for making bags is described and includes a web traveling from an input section to a rotary drum, to an output section. The rotary drum includes at least one seal bar, having a single sealing zone, and a weakening zone disposed within the single sealing zone. The single sealing zone may be a heated perforator, and may include a heating wire. The heating wire may be an NiCr wire stitched into the heater, and be disposed on a cap or on the seal bar. The weakening zone may create a line of weakness that is uniform or varies in intensity. The sealing zone may include temperature zones, cartridge heaters, cooling air, or heated air, or a source of ultrasonic, microwave or radiative energy.

대표청구항 ▼

The invention claimed is: 1. A bag machine, comprising:an input section;a rotary drum, disposed to receive a web from the input section, wherein the rotary drum includes at least one seal bar;an output section, disposed to receive the web from the rotary drum;wherein the at least one seal bar includ

The invention claimed is: 1. A bag machine, comprising:an input section;a rotary drum, disposed to receive a web from the input section, wherein the rotary drum includes at least one seal bar;an output section, disposed to receive the web from the rotary drum;wherein the at least one seal bar includes a sealing zone that forms a single seal, and further includes a heating wire that is a weakening zone within the sealing zone, that forms a weakened zone within the single seal; anda release layer on at least a part of the sealing zone.