External patch packaging structure

Abstract

The present invention has an object to provide a novel external patch packaging structure which suppresses leakage of a chemical solution at the time of opening a bag material. In an external patch packaging structure obtained by enclosing an external patch in which a support is impregnated with a chemical solution in a bag material, as the bag material, one closed by a heat seal band provided at a periphery is used, the heat seal band includes: an easy-peel seal portion; and a strong seal portion having a higher seal strength than the easy-peel seal portion, and when the easy-peel seal portion is peeled off and the bag material is opened, the strong seal portion restricts a peeling area of the heat seal band, and thus a liquid storage pocket is formed inside the bag material.

What is claimed is: 
     
         1 . An external patch packaging structure obtained by enclosing an external patch in which a support is impregnated with a chemical solution in a bag material,
 wherein the bag material is closed by a heat seal band provided at a periphery excluding a fold line of a sheet which is folded in two,   the heat seal band includes:
 an easy-peel seal portion; and 
 a strong seal portion having a higher seal strength than the easy-peel seal portion, and 
   when the easy-peel seal portion is peeled off and the bag material is opened, the strong seal portion restricts a peeling area of the heat seal band, and thus a liquid storage pocket surrounded by the fold line and the strong seal portion is formed inside the bag material.   
     
     
         2 . The external patch packaging structure according to  claim 1 , wherein the strong seal portions are provided at two positions facing each other across the fold line in the heat seal band. 
     
     
         3 . The external patch packaging structure according to  claim 1 , wherein
 the easy-peel seal portion has a seal strength of 7N or less, and   the seal strength of the strong seal portion is 10N or more.   
     
     
         4 . The external patch packaging structure according to  claim 2 , wherein
 the easy-peel seal portion has a seal strength of 7N or less, and   the seal strength of the strong seal portion is 10N or more.   
     
     
         5 . An external patch packaging structure obtained by enclosing an external patch in which a support is impregnated with a chemical solution in a bag material, wherein
 the bag material is closed by a heat seal band provided at a periphery of two sheets, which are overlaid in a partially joined state, excluding a joint portion,   the heat seal band includes:
 an easy-peel seal portion; and 
 a strong seal portion having a higher seal strength than the easy-peel seal portion, and 
   when the easy-peel seal portion is peeled off and the bag material is opened, the strong seal portion restricts a peeling area of the heat seal band, and thus a liquid storage pocket surrounded by the joint portion and the strong seal portion is formed inside the bag material.   
     
     
         6 . The external patch packaging structure according to  claim 5 , wherein the joint portion is constructed by the strong seal portion.