Sealed container and manufacturing method thereof

Abstract

It is an object of the present invention to provide a container in which it is difficult for liquid to drip at a mouth portion having a good touch sensation by forming a structure in which a welded portion that was laser welded in a sealed container does not form a flange, and to carry out the achievement of making polymer material unnecessary and making excessive material in the seaming portion unnecessary. Further, it is also an object to construct the lid and barrel of the vessel by using the same material, thereby facilitating the recycling of material. The sealed container in which a container body 1 having an opening 9 is sealed by a lid portion 3 which closes and covers said opening, comprising a welded portion 4, 14 in which an outer wall surface of a peripheral portion 2 of said opening or an edge 12 surface of said opening and an inner wall surface of said lid portion are laser welded in order to make it possible for at least an inner wall surface of the peripheral portion of said opening from an inner wall surface 6 of said container body to make contact with container contents.

1 . A sealed container in which a container body having an opening is sealed by a lid portion which closes and covers said opening, comprising a welded portion in which an outer wall surface of a peripheral portion of said opening and an inner wall surface of said lid portion are laser welded in order to make it possible for at least an inner wall surface of the peripheral portion of said opening from an inner wall surface of said container body to make contact with container contents.  
     
     
         2 . A sealed container in which a container body having an opening is sealed by a lid portion which closes and covers said opening, comprising a welded portion in which an edge surface of said opening and an inner wall surface of said lid portion are laser welded in order to make it possible for at least an inner wall surface of the peripheral portion of said opening from an inner wall surface of said container body to make contact with container contents.  
     
     
         3 . The sealed container according to  claim 1 , wherein said welded portion does not form a flange.  
     
     
         4 . The sealed container according to  claim 1 , further comprising a non-welded portion in which an inner wall surface of a peripheral portion of said lid portion is not welded to an outer wall surface of said container body.  
     
     
         5 . The sealed container according to  claim 1 , wherein said lid portion has a thickness of 0.2 mm or higher.  
     
     
         6 . The sealed container according to  claim 1 , wherein the welded portion is laser welded in two loop shapes along the periphery of said opening.  
     
     
         7 . The sealed container according to  claim 1 , wherein said lid portion has a multilayer structure in which an annular layer having an inner diameter approximately the same as the opening diameter of said opening is connected to the inner wall surface side, and the container seal is opened by peeling apart said lid portion from said annular layer in the state where said annular layer remains laser welded to said container body.  
     
     
         8 . The sealed container according to  claim 1 , wherein said container body and said lid portion are formed from synthetic resin.  
     
     
         9 . The sealed container according to  claim 1 , wherein said container is a beverage container.  
     
     
         10 . A method of manufacturing a sealed container in which a container body having an opening is sealed by a lid portion which closes and covers said opening, comprising the steps of: 
 forming bonded surfaces by bonding an outer wall surface of a peripheral portion of said opening and an inner wall surface of said lid portion; and    contacting at least an inner wall surface of the peripheral portion of said opening from an inner wall surface of said container body with container contents,    wherein said bonded surfaces are irradiated with a laser to form a welded portion.    
     
     
         11 . A method of manufacturing a sealed container in which a container body having an opening is sealed by a lid portion which closes and covers said opening, comprising the steps of: 
 forming bonded surfaces by bonding an edge surface of said opening and an inner wall surface of said lid portion, and    contacting at least an inner wall surface of the peripheral portion of said opening from an inner wall surface of said container body with container contents,    wherein said bonded surfaces are irradiated with a laser to form a welded portion.    
     
     
         12 . The method of manufacturing a sealed container according to  claim 10 , further comprising the step of providing a laser light absorbing portion in at least one of an outer wall surface of the peripheral portion of said opening or an inner wall surface of said lid portion, or in at least one of an edge surface of said opening or an inner wall surface of said lid portion.  
     
     
         13 . The method of manufacturing a sealed container according to  claim 10 , further comprising the step of providing a laser light absorbing material in a portion of at least one of an outer wall surface of the peripheral portion of said opening or an inner wall surface of said lid portion, or in a portion of at least one of an end portion of said opening or an inner wall surface of said lid portion.  
     
     
         14 . The method of manufacturing a sealed container according to  claim 10 , wherein laser irradiation of said welded portion comprises the step of fixing a laser oscillating element while said container body and said lid portion are rotated around a rotation axis formed by the central axis of the container, or carried out by rotating the laser oscillating element around said container body and said lid portion around a rotation axis formed by the central axis of the container.  
     
     
         15 . The sealed container according to  claim 2 , wherein said welded portion does not form a flange.  
     
     
         16 . The sealed container according to  claim 2 , further comprising a non-welded portion in which an inner wall surface of a peripheral portion of said lid portion is not welded to an outer wall surface of said container body.  
     
     
         17 . The sealed container according to  claim 2 , wherein said lid portion has a thickness of 0.2 mm or higher.  
     
     
         18 . The sealed container according to  claim 2 , wherein the welded portion is laser welded in two loop shapes along the periphery of said opening.  
     
     
         19 . The sealed container according to  claim 2 , wherein said lid portion has a multilayer structure in which an annular layer having an inner diameter approximately the same as the opening diameter of said opening is connected to the inner wall surface side, and the container seal is opened by peeling apart said lid portion from said annular layer in the state where said annular layer remains laser welded to said container body.  
     
     
         20 . The sealed container according to  claim 2 , wherein said container body and said lid portion are formed from synthetic resin.  
     
     
         21 . The sealed container according to  claim 2 , wherein said container is a beverage container.  
     
     
         22 . The method of manufacturing a sealed container according to  claim 11 , further comprising the step of providing a laser light absorbing portion in at least one of an outer wall surface of the peripheral portion of said opening or an inner wall surface of said lid portion, or in at least one of an edge surface of said opening or an inner wall surface of said lid portion.  
     
     
         23 . The method of manufacturing a sealed container according to  claim 11 , further comprising the step of providing a laser light absorbing material in a portion of at least one of an outer wall surface of the peripheral portion of said opening or an inner wall surface of said lid portion, or in a portion of at least one of an end portion of said opening or an inner wall surface of said lid portion.  
     
     
         24 . The method of manufacturing a sealed container according to  claim 11 , wherein laser irradiation of said welded portion comprises the step of fixing a laser oscillating element while said container body and said lid portion are rotated around a rotation axis formed by the central axis of the container, or carried out by rotating the laser oscillating element around said container body and said lid portion around a rotation axis formed by the central axis of the container.