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.
Claims23
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.
A bag made of a flexible material comprising a first and a second flap extending from a given sheet folded along a transversal folding crease towards an internal face and brought together along the edges of the flaps perpendicular to the folding crease, wherein the bag comprises a hem formed on each edge, the hem on the first flap being bonded to the hem of the second flap on the seam faces.
A machine for manufacturing flexible bags comprising:
- a first unwinding means for unreeling a first strip of flexible material in a continuous sheet in a longitudinal direction;
- a folding means for forming a fold of the first strip along a transversal folding crease for folding a first flap onto a second flap against an internal face of the first strip,
- an assembly means for bringing the first and second flaps together along the edges,
- a first cutting means for cutting the strip with a transversal cut to form a section upstream or downstream of the assembly means, the section forming the bag at the end of the operations;
- a hemmer for each edge, to form a hem on each edge of the first strip upstream of the assembly means,
- an application means for applying adhesive to the hems over at least one length of the first or second flap on a seam face,
- the assembly means being folding means configured to bring for each edge hem against hem by the seam face in such a way as to obtain the bonding of the hems together to bring the first and second flaps together along the edges.
Dependencies are inferred from the claim text.