Method of injection molding opening devices on sheet material for packaging pourable food products, and packaging material and package obtained thereby

A sealed package of pourable food product comprising sheet material that is folded and sealed, the sheet material comprising at least a first layer made of a material and a second layer, the first layer including a through opening passing through the first layer, with a cover portion of the second layer extending across the through opening, the through opening in the first layer possessing an inner periphery surrounding a region entirely devoid of the material forming the first layer, the inner periphery of the through opening in the first layer surrounding at least a part of the cover portion of the second layer;

• the sheet material also comprising an opening device made of plastic material, injection molded onto the cover portion, and in turn comprising, integrally, an attachment portion adhering to a first side of the cover portion, and a spout extending through a peripheral portion of the cover portion to project from a second side, opposite the first side, of the cover portion;
• the attachment portion defining, with the cover portion, a user-removable sealing portion of the spout that is both removable by the user to unseal the package of pourable food product and allow the pourable food product to be dispended from the package and entirely devoid of the material forming the first layer.

A sheet material for packaging pourable food product comprising at least a first layer and a second layer, and having an opening passing through the first layer with a cover portion of the second layer extending across the opening, the first layer being made of a material and the opening possessing an inner periphery surrounding a region entirely devoid of the material forming the first layer, at least a part of the cover portion being located in the region surrounded by the inner periphery of the opening;

• the sheet material also comprising an opening device made of plastic material, injection molded onto the cover portion, and in turn comprising, integrally, an attachment portion adhering to a first side of the cover portion, and a spout extending through a peripheral portion of the second layer to project from a second side, opposite the first side, of the cover portion;
• the attachment portion defining, with the cover portion, a user-removable sealing portion of the spout that is removable by the user and that is entirely devoid of the material forming the first layer.