Packaging of the stickpack type with improved opening and method for manufacturing the same

Abstract

A packaging of the Stickpack type and the like with improved opening, comprising a single- or multilayer flexible film that forms a hermetically sealed tubular body provided longitudinally with a first sealing band, of the inside/outside type or of the inside/inside type, of mutually opposite longitudinal flaps of the film and provided transversely with second sealing bands of the inside/inside type; a sealed extension region protrudes from at least one of the second sealing bands on a respective portion of at least one edge of the tubular body, and, in longitudinal alignment with the sealed extension region, transverse preweakening incisions are provided along at least one of the mutually opposite longitudinal flaps.

What is claimed is:  
     
         1 . A packaging of the Stickpack type with improved opening, comprising: a flexible film, having at least one layer, which forms a hermetically sealed tubular body with mutually opposite longitudinal film flaps, a first band provided longitudinally to said body for inside/outside sealing of said mutually opposite longitudinal flaps of the film; second sealing bands provided transversely to said body for inside/inside sealing; a sealed extension region protruding from at least one of said second sealing bands on a respective portion of at least one edge of said tubular body; and transverse preweakening incisions that are provided in longitudinal alignment with said sealed extension region, along at least one of said mutually opposite longitudinal flaps.  
     
     
         2 . The packaging of  claim 1 , wherein said second sealing bands are each provided transversely at longitudinal ends of said tubular body that form a bottom and a top of said packaging, and wherein a weakening pre-cut is provided on said sealed extension region prodruding from the at least one of said second sealing bands that corresponds to the top of the packaging, said transverse weakening incisions being provided along said mutually opposite longitudinal flaps.  
     
     
         3 . The packaging of  claim 1 , wherein said second sealing bands are each provided transversely on the longitudinal ends of said tubular body that form the bottom and the top of said packaging, and wherein a weakening pre-cut is provided on said sealed extension region prodruding from at least one of said second sealing bands that corresponds to the top of the packaging, said transverse weakening incisions being formed along one of said longitudinal flaps of said film.  
     
     
         4 . The packaging of  claim 2 , wherein said transverse weakening incisions are arranged in a series configuration that runs longitudinally along said flaps for a length that is at least equal to a longitudinal length of said sealed extension region.  
     
     
         5 . The packaging of  claim 4 , wherein said transverse weakening incisions are smaller than the width of said first sealing band.  
     
     
         6 . A method for manufacturing packagings of the Stickpack type as set forth in  claim 1 , comprising: unwinding of the film with at least one layer for providing a partial packaging; sealing of said partial packaging by way of longitudinal and transverse seals in order to obtain a hermetically sealed packaging; and providing transverse incisions on at least one of the longitudinal mutually opposite flaps of said film.  
     
     
         7 . The method of  claim 6 , comprising providing a forming collar, said transverse incisions being provided after unwinding said film and before folding said unwound film onto said forming collar.  
     
     
         8 . A packaging of the Stickpack type with improved opening, comprising: a film made with at least one layer, which forms a hermetically longitudinally sealed tubular body having mutually opposite complementary flaps; a first sealing band for longitudinal sealing of said body; second sealing bands for sealing transversely said body; a sealed extension region protruding along a corresponding longitudinal edge of said tubular body from at least one of said second sealing bands; transverse preweakening incisions provided in longitudinal alignment with said sealed extention region along at least one of said mutually opposite longitudinal flaps; and wherein said first sealing band is of an inside/inside sealing type.  
     
     
         9 . The packaging of  claim 8 , wherein said first sealing band is folded and at least partially adheres longitudinally to an outer surface of said tubular body, and wherein an adhesive layer is further provided at said first sealing band for providing adhesion thereof at said outer surface of the body.  
     
     
         10 . The packaging of  claim 9 , wherein said adhesive layer is constituted by a thermolacquer.  
     
     
         11 . The packaging of  claim 9 , wherein said adhesive layer is constituted by a sealing film.  
     
     
         12 . The packaging of  claim 9 , wherein said adhesive layer is distributed at at least one of said second transverse sealing bands having an adjacent heat-sealed extension region provided with a weakening pre-cut.  
     
     
         13 . A method for manufacturing packagings of the Stickpack type as set forth in  claim 8 , comprising: unwinding a film made of at least one layer so as to manufacture a partial packaging; providing transverse incisions on said film on at least one of mutually opposite flaps of said film; sealing longitudinally said partial packaging by way of a first sealing band of an inside/inside sealing type that seals the mutually opposite flaps; applying onto at least one portion of an outer surface of said partial packaging a longitudinal adhesive layer at and proximate to said first sealing band; folding, with respect to a longitudinal axis of the packaging, said first sealing band on the outer surface of said partial packaging on a side of said adhesive layer; adhering said first sealing band to said outer surface portion by activating said adhesive layer; transversely sealing said partial packaging with second sealing bands; and providing a weakening pre-cut on at least one sealed extension region of at least one of said second sealing bands.  
     
     
         14 . The method of  claim 13 , wherein said adhering step of said first sealing band to said at least one outer surface portion precedes the step for transverse sealing of said partial packaging.  
     
     
         15 . The method of  claim 13 , wherein said adhering step of said first sealing band to said outer surface portion follows the step for transverse sealing of said partial packaging.  
     
     
         16 . The method of  claim 13 , wherein said adhesive layer is constituted by thermolacquer.  
     
     
         17 . The method of  claim 14 , wherein the activation step of said adhesive layer is achieved by heating said thermolacquer.  
     
     
         18 . The method of  claim 13 , wherein said step for applying said longitudinal adhesive layer is selectively carried out either in a continuous or intermittent sequence.  
     
     
         19 . The method of  claim 18 , wherein said step for intermittent application of said adhesive layer is carried out at said second sealing bands.  
     
     
         20 . The method of  claim 13 , comprising the step of arranging said longitudinal adhesive layer within a strip of surface constituting said first folded sealing band.