Zipper tape, container provided with zipper tape, and method for manufacturing container provided with zipper tape

Abstract

Provided is a zipper tape including: a first member including a first base strip and a first engagement portion, the first engagement portion protruding from the first base strip; and a second member including a second base strip and a second engagement portion, the second engagement portion protruding from the second base strip and being engageable with the first engagement portion. A minimum gap between the first member and the second member is less than or equal to 1.1 mm, the minimum gap being based on when the first base strip and the second base strip are opposed to each other and the first engagement portion and the second engagement portion are engaged with each other.

1 . A zipper tape comprising:
 a first member comprising a first base strip and a first engagement portion, the first engagement portion protruding from the first base strip; and   a second member comprising a second base strip and a second engagement portion, the second engagement portion protruding from the second base strip and being engageable with the first engagement portion, wherein   a minimum gap between the first member and the second member is less than or equal to 1.1 mm, the minimum gap being based on when the first base strip and the second base strip are opposed to each other and the first engagement portion and the second engagement portion are engaged with each other.   
     
     
         2 . The zipper tape according to  claim 1 , wherein
 the first base strip and the second base strip each comprise a first portion and a second portion, the first portion including a surface from which the first engagement portion or the second engagement portion protrudes, the second portion including a surface on an opposite side to the first engagement portion or the second engagement portion, and   a melting point of a first resin composition forming the first portion is higher than a melting point of a second resin composition forming the second portion.   
     
     
         3 . The zipper tape according to  claim 2 , wherein a main component of the first resin composition is polypropylene, and a main component of the second resin composition is polyethylene. 
     
     
         4 . The zipper tape according to  claim 2 , wherein
 the first portion has a thickness of greater than or equal to 100 μm,   the second portion has a thickness of greater than or equal to 5 μm, and   the first base strip and the second base strip each have a thickness of greater than or equal 105 μm.   
     
     
         5 . The zipper tape according to  claim 1 , wherein
 the first member comprises a first rib provided on a surface on same side as the first engagement portion,   the second member comprises a second rib provided on a surface on same side as the second engagement portion, and   a minimum gap between the first rib and the second rib is less than or equal to 1.1 mm, the minimum gap being based on when the first base strip and the second base strip are opposed to each other and the first engagement portion and the second engagement portion are engaged with each other.   
     
     
         6 . The zipper tape according to  claim 1 , wherein the first base strip and the second base strip comprise respective thick portions, the thick portions each being provided on a surface on an opposite side to the first engagement portion or the second engagement portion. 
     
     
         7 . The zipper tape according to  claim 6 , wherein the thick portions are each provided with a width smaller than half a width of the first base strip or the second base strip at a location other than an end portion in a width direction of the first base strip or the second base strip. 
     
     
         8 . A zipper-tape-equipped container comprising:
 the zipper tape according to  claim 1 ; and   a container body having a first surface to which the first base strip is bonded and a second surface to which the second base strip is bonded.   
     
     
         9 . The zipper-tape-equipped container according to  claim 8 , wherein
 the first engagement portion is a female engagement portion, and the second engagement portion is a male engagement portion,   the zipper tape is disposed in contact with a containing space, the containing space being provided between the first surface and the second surface, and   the first base strip is not bonded to the first surface on a side of the containing space relative to the first engagement portion, and is bonded to the first surface on an opposite side to the containing space relative to the first engagement portion.   
     
     
         10 . The zipper-tape-equipped container according to  claim 8 , wherein the container body has a bag shape. 
     
     
         11 . A method of manufacturing the zipper-tape-equipped container according to  claim 8 , the method comprising:
 interposing the zipper tape inside the container body; and   respectively bonding, without interposing a plate between the first base strip and the second base strip, the first base strip and the second base strip to the first surface and the second surface.