Manufacturing method for realizing a foldable bag (20), comprising moving a semi-finished continuous tubular structure (300) made of plastic material in a forwarding direction; passing it on a cylindrical support structure (800) having the same diameter of the tubular structure so that it assumes a circular cross section; slipping it off said cylindrical support structure and entering folding means (500) comprising four longitudinal elements provided at the vertices of a quadrangle so that the cross-section of the tubular structure assumes a quadrangular shape; applying on both the lateral sides of the rectangular cross section an infold lateral force to produce a flat tubular band; completing the flattening of the tubular band by means of flattening means (600); sealing transversely said tubular band by means of sealing means (1050); realizing a pre-cut close to and upstream of said sealing with respect to said forwarding direction. A corresponding apparatus and a bag.
B31B 1/40 - Folding sheets, blanks, or webs by continuously feeding same to stationary members, e.g. plates, ploughs, cores the members being forming-tubes acting internally
B31B 1/52 - Folding sheets, blanks, or webs by reciprocating or oscillating members, e.g. fingers other than plungers and dies
B31B 1/90 - Attaching accessories not otherwise provided for, e.g. opening or closure devices, tear strings
B31B 23/00 - Machinery characterised by making rectangular envelopes or bags of flat form, i.e. without structural provision at the base for thickness of contents, from webs, e.g. from flattened tubular webs
2.
CONTAINING BOX FOR FOOD PRODUCTS, FLOWERS, AND THE LIKE
The present invention relates to a containing box for packaging of products, especially food products, and particularly fresh, frozen, semi-processed and processed alimentary food products and the like and flower. The containing box (100) according to the present invention is characterized for the fact that it comprises an assemblable rigid frame structure (10) and, connected to the rigid frame structure (10), a foldable bag (20) for containing the products, the foldable bag (20) being formed by a single folded sheet of material close on five sides. The present invention relates also to a manufacturing method for realizing such containing box.
B65D 21/02 - Containers specially shaped, or provided with fittings or attachments, to facilitate nesting, stacking, or joining together
B65D 25/18 - Linings or internal coatings spaced appreciably from container wall
B65D 85/50 - Containers, packaging elements or packages, specially adapted for particular articles or materials for living organisms, articles or materials sensitive to changes of environment or atmospheric conditions, e.g. land animals, birds, fish, water plants, non-aquatic plants, flower bulbs, cut flowers or foliage
B65B 67/12 - Sack holders, i.e. stands or frames with means for supporting sacks in the open condition to facilitate filling with articles or materials
patents