Sealing device for sealing an opening of a bag-shaped film body

Abstract

A sealing device includes a frame member having an opening portion, an engaging portion with which a first portion of the bag-shaped film body is engaged, and a heater unit; a moving member having an attaching portion to which a second portion of the bag-shaped film body is attached and a heater receiving portion; and a handle member that is slidably inserted in the frame member and coupled to the moving member. The moving member is arranged so as to be movable in the opening portion toward the engaging portion, and the heater unit and the heater receiving portion are configured to clamp the bag-shaped film body and heat and seal it in a state in which the moving member is moved to the vicinity of the engaging portion by the handle member.

What is claimed is: 
     
         1 . A bag-shaped film body comprising a plate member formed in a polygonal annular shape in a plan view and provided around an end edge portion of an opening, wherein the plate member is formed by coupling a plurality of strip-shaped plate portions together at a plurality of foldable portions. 
     
     
         2 . The bag-shaped film body according to  claim 1 , wherein the plate member has six plate portions of a first plate portion, a second plate portion, a third plate portion, a fourth plate portion, a fifth plate portion, and a sixth plate portion in this order, and the six plate portions are coupled at six foldable portions. 
     
     
         3 . The bag-shaped film body according to  claim 2 , wherein
 the six foldable portions are a first foldable portion, a second foldable portion, a third foldable portion, a fourth foldable portion, a fifth foldable portion, and a sixth foldable portion that are arranged in this order from the first foldable portion between the first plate portion and the second plate portion,   the first foldable portion, the third foldable portion, the fourth foldable portion, and the sixth foldable portion are formed so as to be easily folded outward the opening, and   the second foldable portion and the fifth foldable portion are formed so as to be easily folded inward the opening.   
     
     
         4 . The bag-shaped film body according to  claim 3 , wherein the second plate portion and the fifth plate portion are each provided with an auxiliary foldable portion formed in a vicinity of a center in a longitudinal direction so as to be easily folded outward the opening. 
     
     
         5 . The bag-shaped film body according to  claim 2 , wherein when the bag-shaped film body is attached to the sealing device according to  claim 1 ,
 the first plate portion is attached to the moving member as the first portion, and   the fourth plate portion is attached to the engaging portion as the second portion.   
     
     
         6 . The bag-shaped film body according to  claim 1 , wherein
 the plate member is made of paper, and   the foldable portions are formed by paper creasing.