Straight-split pouch, method for manufacturing same, and device for manufacturing the pouch

Abstract

A straight-split pouch, a method for manufacturing the pouch, and a device for manufacturing the pouch. The pouch is based on a front synthetic resin sheet and a rear synthetic resin sheet, has a notch marking the tear starting point at the openable portion, and has a series of multiple grooves for splitting disposed at a predetermined distance from one another along a straight line at the openable portion starting from the notch. The method includes producing a base film; producing the grooves for splitting; applying an adhesive to the surface protection layer and drying the layer; adhering the base film to the surface protection layer; sealing a large-area sheet; and cutting the sealed large-area sheet and forming the notch. The device includes first and second winding portions; an adhesive application portion; a chamber; a shaping apparatus; a laminating treatment portion; and a heat seal and cutting portion.

1 . A straight-split pouch for packaging a product which needs to be protected from moisture or oxygen for a long time, the pouch essentially comprising two synthetic resin sheets including a front sheet and a rear sheet and having a notch corresponding to a tear starting point at an opening position and a cutting line in which a plurality of cutting grooves continuing in a straight line from the notch are formed at regular intervals along the opening position,
 wherein each the front sheet and the rear sheet has a structure in which a surface protective layer is stacked on a base film comprising a reinforcing layer and a heat sealable resin layer, and   wherein the cutting grooves are formed on one side of the reinforcing layer of the base film bonded to the surface protective layer.   
     
     
         2 . The pouch of  claim 1 , wherein at least two cutting grooves are spaced vertically at regular intervals from each other. 
     
     
         3 . The pouch of  claim 1 , wherein the interval between the cutting grooves is 0.1 to 2 mm. 
     
     
         4 . The pouch of  claim 1 , wherein the surface protective layer, the reinforcing layer, and the heat sealable resin layer are formed of a polyester (PET) film, a nylon film, and a non-oriented or polyethylene (PE) film, respectively. 
     
     
         5 . The pouch of  claim 1 , wherein the surface protective layer, the reinforcing layer, and the heat sealable resin layer are formed of a polyester (PET) film, a synthetic film in which aluminum is deposited on the surface of nylon, and a non-oriented or polyethylene (PE) film, respectively. 
     
     
         6 . The pouch of  claim 4 , wherein the surface protective layer, the reinforcing layer, and the heat sealable resin layer are bonded to each other with an adhesive layer interposed therebetween by lamination. 
     
     
         7 . A method for manufacturing a straight-split pouch, the method comprising:
 (a) forming a base film comprising a reinforcing layer and a heat sealable resin layer;   (b) applying an adhesive onto a back side of the surface protective layer, whose front side is printed with information about the contents of the pouch, and drying the resulting layer;   (c) forming a cutting line by forming a plurality of straight cutting grooves at regular intervals on one side of the reinforcing layer of the base film which is to be bonded to the surface protective layer;   (d) forming large area front and rear sheets by bonding the surface protective layer onto reinforcing layer of the base film;   (e) sealing the two large area front and rear sheets into predetermined sections while transferring the large area sheets which are being in contact with each other; and   (f) cutting the sealed large area sheets into the sections and, at the same time, forming a notch corresponding to a tear starting point on each pouch.   
     
     
         8 . The method of  claim 7 , wherein the application of the adhesive in step (b) is performed such a manner that the back side of the surface protective layer is moved in contact with the surface of an adhesive applying roller, which is partially exposed to a reservoir storing the adhesive, so as to be continuously applied with the adhesive. 
     
     
         9 . The method of  claim 7 , wherein the drying of the adhesive in step (b) is performed in such a manner that the surface protective layer is continuously passed through a chamber, which has an inlet and an outlet and into which hot air is blown, so as to be dried. 
     
     
         10 . The method of  claim 7 , wherein the cutting line in step (c) is formed by continuously passing the base film through a shaping device comprising a shaping roller having a shaping surface with a fine concave-convex pattern formed on the circumferential surface thereof and a roller rotating in engagement with the shaping roller. 
     
     
         11 . The method of  claim 10 , wherein the width of the concave-convex pattern formed on the shaping roller is 0.1 to 2 mm. 
     
     
         12 . An apparatus for manufacturing a straight-split pouch, the apparatus comprising:
 a first winding unit on which a surface protective layer, whose front side is printed with information about the contents of the pouch, is wound;   an adhesive applying unit which is configured to continuously apply an adhesive onto a back side of the surface protective layer wound on the first winding unit;   a chamber which is configured to dry the adhesive applied onto the back side of the surface protective layer;   a second winding unit on which a base film comprising a reinforcing layer and a heat sealable resin layer is wound;   a shaping device which is configured to continuously form a plurality of straight cutting grooves at regular intervals on one side of the reinforcing layer of the base film;   a lamination unit which is configured to form a large area sheet by laminating the surface protective layer applied with the adhesive and the base film having the cutting grooves;   a heat seal which is configured to seal two large sheets transferred in contact with each other into predetermined sections; and   a cutting unit which is configured to cut the sealed large area sheets into the sections and, at the same time, form a notch corresponding to a tear starting point on each pouch.   
     
     
         13 . The apparatus of  claim 12 , wherein the adhesive applying unit has a structure in which an adhesive applying roller is rotatably mounted and partially exposed to a reservoir storing the adhesive. 
     
     
         14 . The apparatus of  claim 12 , wherein the chamber has a structure in which an inlet and an outlet, through which the surface protective layer whose back side is applied with the adhesive is continuously passed in a horizontal direction, are provided, and a plurality of hot-air blowing nozzles which blows hot air to dry the adhesive are spaced from each other. 
     
     
         15 . The apparatus of  claim 12 , wherein the shaping device comprises a shaping roller having a shaping surface with a fine concave-convex pattern formed on the circumferential surface thereof and a roller rotating in engagement with the shaping roller, the shaping roller being moved forward and backward by a cylinder and a linear guide connected to the cylinder. 
     
     
         16 . The apparatus of  claim 15 , wherein the width of the concave-convex pattern formed on the shaping roller is 0.1 to 2 mm. 
     
     
         17 . The apparatus of  claim 12 , further comprising a cooling roller which is configured to cool the large area sheets, each comprising the surface protective layer and the base film which are bonded by the lamination unit. 
     
     
         18 . The pouch of  claim 5 , wherein the surface protective layer, the reinforcing layer, and the heat sealable resin layer are bonded to each other with an adhesive layer interposed therebetween by lamination.