Method for manufacturing a packaging container

Abstract

A packaging container is manufactured in which an internal space for storing contents is formed by a laminate film. A circumferential end part of the laminate film is subjected to a thermal fusion treatment to form a sealed portion. A first slit having a predetermined length is formed in the laminate film so as to intersect a part of the sealed portion. A second adhesive layer is disposed in a region having a predetermined width in a neighborhood of the first slit. Thus, through a simple constructions, leakage can be prevented in the packaging container, and breakage of the packaging container and flying-out of the contents accompanying a pressure rise in the inside of the container can be prevented when warming the contents together with the container body.

1 . A method for manufacturing a packaging container having a laminate film formed by laminating a plurality of thin-layer films, so as to form an internal space for storing contents, in which at least a part of a circumferential end part of the laminate film is subjected to a thermal fusion treatment to form a sealed portion, comprising the steps of:
 (1) supplying at least two or more thin-layer films comprising a first inner layer film that is in contact with the internal space and a second inner layer film that is in contact with an outer side surface of the first inner layer film respectively from source rolls of the films;   (2) forming one or more slits, which comprise a first slit and are continuously or intermittently connected to the first slit, in the first inner layer film;   (3) applying a first adhesive agent, which maintains an adhesive property under temperature and pressure conditions at using the packaging container, to a first region between the first inner layer film and the second inner layer film, so as to form a first adhesive layer;   (4) applying a second adhesive agent, which has a lower melting temperature than the first adhesive agent, to a second region having a predetermined width and a predetermined length, excluding the first region, in a neighborhood of the slits comprising at least the first slit, so as to form a second adhesive layer;   (5) bonding at least the first inner layer film, the second inner layer film, the first adhesive layer, and the second adhesive layer, so as to produce the laminate film;   (6) shaping the laminate film in order that the laminate film has a predetermined shape constituting the packaging container and in order that the first slit intersects a part of a fused portion formed in the circumferential end part of the laminate film,   and further comprising the steps of:   (7a) forming a sealed portion by performing a thermal fusion treatment on the circumferential end part of the laminate film so as to form the internal space while leaving an inlet portion for introducing the contents; and   (8a) introducing the contents from the inlet portion into the internal space and performing a thermal fusion treatment on the inlet portion to form a seal of the packaging container, or   alternatively further comprising the steps of:   (7b) introducing the contents into the internal space formed by the laminate film; and   (8b) forming a seal of the packaging container by performing a thermal fusion treatment on the circumferential end part of the laminate film.   
     
     
         2 . The method for manufacturing the packaging container according to  claim 1 , comprising, a step (8c), between the steps (7a) and (8a):
 (8c) tightly sealing an inert gas or a gas predetermined by the contents under pressurized conditions, or alternatively comprising a step (8e), between the steps (7b) and (8b):   (8e) tightly sealing an inert gas or a gas predetermined by the contents under pressurized conditions.   
     
     
         3 . A method for manufacturing a packaging container having a laminate film formed by laminating a plurality of thin-layer films, so as to form an internal space for storing contents, in which at least a part of a circumferential end part of the laminate film is subjected to a thermal fusion treatment to form a sealed portion, comprising the steps of:
 (1) supplying at least two or more thin-layer films comprising a first inner layer film that is in contact with the internal space and a second inner layer film that is in contact with an outer side surface of the first inner layer film respectively from source rolls of the films;   (2a) continuously or intermittently forming the slits comprising a first slit parallel to a direction of supplying the first inner layer film from the source roll;   (3a) simultaneously performing application of the first adhesive agent to a first region between the first inner layer film and the second inner layer film, and application of the second adhesive agent to a second region having a predetermined width and a predetermined length, excluding the first region, in a neighborhood of the slits comprising at least the first slit, so as to form the first adhesive layer and the second adhesive layer simultaneously;   (5) bonding at least the first inner layer film the second inner layer film, the first adhesive layer, and the second adhesive layer, so as to produce the laminate film;   (6) shaping the laminate film in order that the laminate film has a predetermined shape constituting the packaging container and in order that the first slit intersects a part of a fused portion formed in the circumferential end part of the laminate film,   and further comprising the steps of:   (7a) forming a sealed portion by performing a thermal fusion treatment on the circumferential end part of the laminate film so as to form the internal space while leaving an inlet portion for introducing the contents; and   (8a) introducing the contents from the inlet portion into the internal space and performing a thermal fusion treatment on the inlet portion to form a seal of the packaging container, or   alternatively further comprising the steps of:   (7b) introducing the contents into the internal space formed by the laminate film; and   (8b) forming a seal of the packaging container by performing a thermal fusion treatment on the circumferential end part of the laminate film.   
     
     
         4 . (canceled) 
     
     
         5 . A method for manufacturing a packaging container, having a laminate film formed by laminating a plurality of thin-layer films, so as to form an internal space for storing contents, in which at least a part of a circumferential end part of the laminate film is subjected to a thermal fusion treatment to form a sealed portion, comprising the steps of:
 (1) supplying at least two or more thin-layer films comprising a first inner layer film that is in contact with the internal space and a second inner layer film that is in contact with an outer side surface of the first inner layer film respectively from source rolls of the films;   (2b) applying a first adhesive agent, which maintains an adhesive property under temperature and pressure conditions at using the packaging container, to a first region between the first inner layer film and the second inner layer film, so as to form a first adhesive layer;   (3b) applying a second adhesive agent, which has a lower melting temperature than the first adhesive agent, to a second region having a predetermined width and a predetermined length, excluding the first region, in a neighborhood of the slits comprising at least the first slit, so as to form a second adhesive layer;   (4b) bonding at least the first inner layer film, the second inner layer film, the first adhesive layer, and the second adhesive layer, so as to produce the laminate film;   (5b) forming one or more slits, which comprise the first slit and are continuously or intermittently connected to the first slit, by performing laser processing on the first inner layer film on which the second adhesive layer has been formed;   (6) shaping the laminate film in order that the laminate film has a predetermined shape constituting the packaging container and in order that the first slit intersects a part of a fused portion formed in the circumferential end part of the laminate film,   and further comprising the steps of:   (7a) forming a sealed portion by performing a thermal fusion treatment on the circumferential end part of the laminate film so as to form the internal space while leaving an inlet portion for introducing the contents; and   (8a) introducing the contents from the inlet portion into the internal space and performing a thermal fusion treatment on the inlet portion to form a seal of the packaging container, or   alternatively further comprising the steps of:   (7b) introducing the contents into the internal space formed by the laminate film; and   (8b) forming a seal of the packaging container by performing a thermal fusion treatment on the circumferential end part of the laminate film.   
     
     
         6 . (canceled) 
     
     
         7 . The method for manufacturing the packaging container according to  claim 1 , wherein the packaging container has a container body having a recess that is shaped to be capable of storing the contents, a planar opening part that is shaped at one end plane, and a flange part having a predetermined width that is formed on an outer circumference of the opening part, and has the laminate film; and
 the circumferential end part of the laminate film is thermally fused to the flange part to form the sealed portion in the step (7a) and the seal in the step (8a) or (8d), or alternatively the seal in the step (8b) or (8f).   
     
     
         8 . The method for manufacturing the packaging container according to  claim 3 , wherein the packaging container has a container body having a recess that is shaped to be capable of storing the contents, a planar opening part that is shaped at one end plane, and a flange part having a predetermined width that is formed on an outer circumference of the opening part, and has the laminate film; and
 the circumferential end part of the laminate film is thermally fused to the flange part to form the sealed portion in the step (7a) and the seal in the step (8a) or (8d), or alternatively the seal in the step (8b) or (8f).   
     
     
         9 . The method for manufacturing the packaging container according to  claim 5 , wherein the packaging container has a container body having a recess that is shaped to be capable of storing the contents, a planar opening part that is shaped at one end plane, and a flange part having a predetermined width that is formed on an outer circumference of the opening part, and has the laminate film; and
 the circumferential end part of the laminate film is thermally fused to the flange part to form the sealed portion in the step (7a) and the seal in the step (8a) or (8d), or alternatively the seal in the step (8b) or (8f).   
     
     
         10 . The method for manufacturing the packaging container according to  claim 3 , comprising, a step (8c), between the steps (7a) and (8a):
 (8c) tightly sealing an inert gas or a gas predetermined by the contents under pressurized conditions, or   
       alternatively comprising a step (8e), between the steps (7b) and (8b):
 (8e) tightly sealing an inert gas or a gas predetermined by the contents under pressurized conditions. 
 
     
     
         11 . The method for manufacturing the packaging container according to  claim 5 , comprising, a step (8c), between the steps (7a) and (8a):
 (8c) tightly sealing an inert gas or a gas predetermined by the contents under pressurized conditions, or   
       alternatively comprising a step (8e), between the steps (7b) and (8b):
 (8e) tightly sealing an inert gas or a gas predetermined by the contents under pressurized conditions. 
 
     
     
         12 . The method for manufacturing the packaging container according to  claim 2 , wherein the packaging container has a container body having a recess that is shaped to be capable of storing the contents, a planar opening part that is shaped at one end plane, and a flange part having a predetermined width that is formed on an outer circumference of the opening part, and has the laminate film; and
 the circumferential end part of the laminate film is thermally fused to the flange part to form the sealed portion in the step (7a) and the seal in the step (8a) or (8d), or alternatively the seal in the step (8b) or (8f).   
     
     
         13 . The method for manufacturing the packaging container according to  claim 10 , wherein the packaging container has a container body having a recess that is shaped to be capable of storing the contents, a planar opening part that is shaped at one end plane, and a flange part having a predetermined width that is formed on an outer circumference of the opening part, and has the laminate film; and
 the circumferential end part of the laminate film is thermally fused to the flange part to form the sealed portion in the step (7a) and the seal in the step (8a) or (8d), or alternatively the seal in the step (8b) or (8f).   
     
     
         14 . The method for manufacturing the packaging container according to  claim 11 , wherein the packaging container has a container body having a recess that is shaped to be capable of storing the contents, a planar opening part that is shaped at one end plane, and a flange part having a predetermined width that is formed on an outer circumference of the opening part, and has the laminate film; and
 the circumferential end part of the laminate film is thermally fused to the flange part to form the sealed portion in the step (7a) and the seal in the step (8a) or (8d), or alternatively the seal in the step (8b) or (8f).