Zipper tape and package bag with zipper tape

Abstract

A head of a male member and a concave groove of a female member are engageable with and disengageable from each other and form a containing space inside a bag body. On an inner surface of the concave groove, there is provided a fusion layer that fuses an outer surface of the head and the inner surface of the concave groove facing each other, when foods are heat-sterilized for long storage. A peeling strength of the fusion layer only needs to be set by selecting a material of the fusion layer or setting dimensions of an area of the fusion layer such that the fusion layer does not require a large force for opening the bag, thereby providing a favorable opening feeling. The fusion layer provides air-tightness, so that the foods can be prevented from leaking out although a pressure within the containing space is increased in the heat sterilization.

1 . A zipper tape comprising: a pair of a male member and a female member that are engageable with and disengageable from each other, the zipper tape being provided to a bag body that contains an object to be heated, wherein
 at least one of the male member and the female member includes a fusion layer that fuses engagement contact surfaces of the male member and the female member when heating the object.   
     
     
         2 . The zipper tape according to  claim 1 , wherein
 the fusion layer has a melting point from 60 degrees C. to 150 degrees C.   
     
     
         3 . A zipper tape comprising: a pair of a male member and a female member that are engageable with and disengageable from each other, wherein
 at least one of the male member and the female member includes a fusion layer capable of fusing engagement contact surfaces of the male member and the female member, the fusion layer being formed of a resin having a melting point from 60 degrees C. to 150 degrees C. lower than a melting point of each of the male member and the female member.   
     
     
         4 . The zipper tape according to  claim 2 , wherein,
 the fusion layer is formed of at least one of an ethylene-vinyl acetate copolymer resin and metallocene-type linear low-density polyethylene.   
     
     
         5 . The zipper tape according to  claim 1 , wherein
 the fusion layer is provided in a line so as to be in linear contact with the engagement contact surfaces along a longitudinal direction of the tape.   
     
     
         6 . The zipper tape according to  claim 1 , wherein
 the fusion layer is provided in a film so as to be in surface contact with the engagement contact surfaces along the longitudinal direction of the tape.   
     
     
         7 . A packaging bag comprising: a bag body; and
 the zipper tape according to  claim 1  which is attached to the bag body.   
     
     
         8 . The zipper tape according to  claim 3 , wherein,
 the fusion layer is formed of at least one of an ethylene-vinyl acetate copolymer resin and metallocene-type linear low-density polyethylene.   
     
     
         9 . The zipper tape according to  claim 3 , wherein
 the fusion layer is provided in a line so as to be in linear contact with the engagement contact surfaces along a longitudinal direction of the tape.   
     
     
         10 . The zipper tape according to  claim 3 , wherein
 the fusion layer is provided in a film so as to be in surface contact with the engagement contact surfaces along the longitudinal direction of the tape.   
     
     
         11 . A packaging bag comprising: a bag body; and
 the zipper tape according to  claim 3  which is attached to the bag body.