Process for producing ultrasonic seal, and film structures and flexible containers with same

The present disclosure is directed to processes for producing ultrasonic sealable film structures and flexible containers with ultrasonic seals. The film structure includes a first multilayer film and a second multilayer film. Each multilayer film includes a backing layer and a seal layer. Each seal layer includes an ultrasonic sealable olefin-based polymer (USOP) having the following properties: (a) a heat of melting, [Delta]Hm, less than 130 J/g, (b) a peak melting temperature, Tm, less than 125 DEG C, (c) a storage modulus in shear (G') from 50 MPa to 500 MPa, and (d) a loss modulus in shear (G") greater than 10 MPa. The multilayer films are arranged such that the seal layer of the first multilayer film is in contact with the seal layer of the second multilayer film. The seal layers form an ultrasonic seal having a seal strength from 30 N/15 mm to 80 N/15 mm when ultrasonically sealed at 4 N/mm seal force. 本发明是针对用于产生具有超声波密封件的超声波可密封的膜结构和柔性容器的方法。所述膜结构包括第多层膜和第二多层膜。每个多层膜包括背层和密封层。每个密封层包括具有以下特性的超声波可密封的烯烃基聚合物(USO