Patent ID: 6688078
Filing Date: 2004-02-10
Classification: B32B,B65B,B65D

Abstract:
A process of forming an airtight package on a flow-pack automatic packaging machine, wherein a series of products is continuously advanced on a horizontal conveyor towards a packaging station having a tubular forming device through which said products are made to advance, said process comprising the steps of:feeding a single peelable synthetic film from a reel, said single peelable film including an oriented polyamide layer coupled with a coextruded peelable polyethylene layer of substantially homogeneous thickness; longitudinally folding the peelable film around said tubular forming device to form a first limb on which a product is placed and a second limb overlaying the product such that said product is wrapped between the polyethylene layers of said first and second limbs, said first limb having a greater length than said second limb; longitudinally welding together the polyethylene layers of the first and second limbs of the peelable film to form a first longitudinal peelable seal located between said product and free edges of said limbs and to create gripping portions between said peelable seal and the free edges of the limbs, such that said gripping portions are for hand gripping to delaminate said peelable seal in order to obtain a product access opening in the package; transversely welding the polyethylene layers of said first and second limbs to form a second and a third transversal seals extending transversely from a fold line formed by the longitudinally folding step towards the free edges of the limbs; cutting the peelable film along the second and third seals to form an individual sealed package; folding said hand gripping portion of the first limb to overlay said band gripping portion of the second limb; and applying a coupling and closing to said hand gripping portion of the first limb, said coupling and closing making it possible to repeatedly open and close said package after said peelable seal has been opened for the first time, said coupling and closing not involving said first, second and third seals.