Process for manufacturing bags for packaging items, and bag produced therefrom

A process for manufacturing bags, the process comprising steps of:

• conveying continuously a flexible and printed continuous web having a first opacity degree along a conveying direction, the flexible printed continuous web having printed features in an original configuration;
• while being conveyed along the conveying direction, cutting the flexible and printed continuous web along a longitudinal axis, extending parallel to the conveying direction, to form at least two printed web sections, each one of the at least two printed web sections having at least one longitudinal inner edge, at least two of the printed web sections including a portion of the printed features requiring relative alignment;
• spacing apart the at least two printed web sections while maintaining an alignment between the at least two printed web sections along the conveying direction by adjusting a tension applied to at least one of the at least two printed web sections;
• inserting a flexible and transparent continuous web between adjacent ones of the at least two spaced-apart printed web sections while maintaining the relative alignment between the at least two printed web sections including the portion of the printed features requiring relative alignment along said conveying direction by adjusting a tension applied to at least one of the at least two printed web sections, the flexible and transparent continuous web sheet having a second opacity degree, less opaque than the first opacity degree;
• and
• securing longitudinal edges of the flexible and transparent continuous web to a respective one of the longitudinal inner edges of the adjacent spaced-apart printed web sections to form a combined continuous web, wherein the portions of the printed features of the at least two printed web sections located on a respective side of the flexible and transparent continuous web are aligned one with another according to the original configuration;
• wherein spacing apart the at least two printed web sections, inserting the flexible and transparent continuous web, and securing the longitudinal edges of the flexible and transparent web occur while the web is being conveyed;
• then, cutting transversally the combined continuous web to define bag forming sheets;
• folding the bag forming sheets;
• and
• securing together at least two pairs of superposed free edges of the folded bag forming sheets to form a bag, the bag having a front wall and a back wall, a top edge, an opposed bottom edge and two spaced-apart longitudinal edges extending between the top and the bottom edges, the bag having an open mouth extending along the top edge and being closed along the bottom and longitudinal edges, the front and the back walls including printed bag sections, at least one of the front and back walls including one or more windows made from the flexible and transparent continuous web, with portions of the printed features on the printed bag sections being aligned on each side of the one or more windows.