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US 12,747,068 B2Granted
Method and machine for manufacturing a flexible envelope-like bag, particularly with reinforcement
AssigneeHolweg Group
InventorCédric Ritondo
Life of this patent
Estimating the term…
Abstract
A method for manufacturing flexible bags, including: a first strip of flexible material is unwound as a continuous sheet in a longitudinal direction; a hem is formed on each edge of the first strip and the hems are glued over at least one length of a first or a second flap on one stitching face; a fold is formed in the first strip along a transverse folding line to fold down the first flap over the second flap against an internal face of the first strip, the fold bringing, for each edge, hem against hem so as to obtain the bonding of the hems, the strip is cut along a transverse section to form the bag at the end of the operations. Machine implementing the method and bag thus obtained.
Claims13
A process for manufacturing flexible bags, whereby:
- a first strip of flexible material is unreeled as a continuous sheet in a longitudinal direction,
- a fold is made on the first strip along a transversal folding crease to fold a first flap onto a second flap against an internal face of the first strip,
- the first and second flap are brought together along the edges,
- the strip is cut by a transversal cut to form a section before or after the folding of the flaps one onto the other, the section forming the bag at the end of the operations,
- wherein a hem is formed on each edge of the first strip before folding and adhesive is applied to the hems at least over one length of the first or second flap on one seam face,
- the folding bringing for each edge hem against hem by the seam face in such a way as to obtain bonding of the hems to each other to bring the first and the second flaps together along the edges,
- at least one reinforcement layer is unreeled,
- the reinforcement layer is cut to obtain a system with at least one reinforcement panel,
- a first application of adhesive is made at least on one of the elements among the first strip and the system with at least one reinforcement panel, and
- before folding, the first strip and the system with at least one reinforcement panel are brought together on the internal face of the first strip to stick them together by means of a first application of adhesive, in such a way that the system with at least one reinforcement panel is situated between the first and second flaps.
7 more elements
A process for manufacturing flexible bags, whereby:
- a first strip of flexible material is unreeled as a continuous sheet in a longitudinal direction,
- a fold is made on the first strip along a transversal folding crease to fold a first flap onto a second flap against an internal face of the first strip
- the first and second flap are brought together along the edges,
- the strip is cut by a transversal cut to form a section before or after the folding of the flaps one onto the other, the section forming the bag at the end of the operations,
- wherein a hem is formed on each edge of the first strip before folding and adhesive is applied to the hems at least over one length of the first or second flap on one seam face,
- the folding bringing for each edge hem against hem by the seam face in such a way as to obtain bonding of the hems to each other to bring the first and the second flaps together along the edges, and
- whereby a second strip of flexible material is unreeled, a second application of adhesive is made, and the second strip and the first strip are brought together on the internal face of the first strip so they adhere to each other thanks to a second application of adhesive.
4 more elements
A process for manufacturing flexible bags, whereby:
- a first strip of flexible material is unreeled as a continuous sheet in a longitudinal direction,
- a fold is made on the first strip along a transversal folding crease to fold a first flap onto a second flap against an internal face of the first strip,
- the first and second flap are brought together along the edges,
- the strip is cut by a transversal cut to form a section before or after the folding of the flaps one onto the other, the section forming the bag at the end of the operations,
- wherein a hem is formed on each edge of the first strip before folding and adhesive is applied to the hems at least over one length of the first or second flap on one seam face,
- the folding bringing for each edge hem against hem by the seam face in such a way as to obtain bonding of the hems to each other to bring the first and the second flaps together along the edges, and
- whereby a cheek is also formed on each edge of the first strip, the cheek being folded against the internal face and extending between the hem and a central part of the strip, in such a way that a stack is formed with, in the following order, the central part, the cheek and the hem, the cheeks forming a bellows linking the first and second flaps after bonding of the hems.
4 more elements
Dependencies are inferred from the claim text.