Flexible paper-polymer multilayer package, preferably for dried food products
AssigneeBarilla G. e R. Fratelli S.p.A.
InventorsLuciano Bertozzi, Francesca Righi, Giacomo Canali
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Abstract
Paper-polymer multilayer package, preferably for dried food products, comprising: a front wall (2) and a rear wall (3) that are opposite, said walls defining at least one upper closing fin and being laterally connected to each other by two lateral walls (5). Said lateral walls define at least upper-folding portions (5u) folded over themselves and inserted in the respective closing fin, wherein upper lateral windows (7u) exposing a polymeric inner layer are provided at the upper-folding portions (5u).
Claims10
A package, entirely made of a multilayer sheet comprising at least one outer layer made of paper material and one inner layer made of polymeric material, said sheet defining a tubular envelope provided with a front wall and with a rear wall that are opposite and laterally connected to each other by two lateral walls, said tubular envelope being sealed at the top and at the bottom so as to define said package;
- wherein said package comprises at least one upper closing fin comprising upper-sealing portions of the front wall and of the rear wall, respectively, sealed with each other with upper-folding portions of the lateral walls folded over themselves and interposed therebetween;
- wherein said package comprises upper lateral windows in which the outer layer is absent, thereby exposing the inner layer, said upper lateral windows at least partially occupying said upper-folding portions.
A method for producing a package, comprising the steps of:
- coupling at least one outer layer made of paper material and one inner layer made of polymeric material to form a multilayer sheet;
- shaping and longitudinally sealing said multilayer sheet on itself to form a tubular envelope provided with a front wall and with a rear wall that are opposite and laterally connected to each other by two lateral walls;
- coupling upper-sealing portions of the front wall and of the rear wall, respectively, by folding between them upper-folding portions of the lateral walls;
- sealing at the top, along an upper closing fin, said upper-sealing portions with the upper-folding portions interposed, thereby making an upper sealing;
- sealing at the bottom said tubular envelope, thereby making a lower sealing;
- wherein said method further comprises a step, which is preliminary to making the upper sealing, of obtaining upper lateral windows in which the outer layer is absent, thereby exposing the inner layer, said upper lateral windows at least partially occupying said upper-folding portions.
Dependencies are inferred from the claim text.