Zipper tape, zipper-tape-equipped container, and method for preventing falsification

Abstract

A zipper tape is provided including: a first base; a male engagement portion protruding from the first base; a second base; and a female engagement portion protruding from the second base, in which the male engagement portion includes first and second hooks protruding outward, the female engagement portion includes third and fourth hooks protruding inward, the first hook is engaged with the third hook and the second hook is engaged with the fourth hook when the male engagement portion fits inside the female engagement portion, and a force required for causing the male engagement portion to fit inside the female engagement portion is in a range from 30 N/15 mm to 100 N/15 mm.

1 . A zipper tape comprising:
 a first base;   a male engagement portion protruding from the first base;   a second base; and   a female engagement portion protruding from the second base, wherein   the male engagement portion comprises first and second hooks protruding outward,   the female engagement portion comprises third and fourth hooks protruding inward,   when the male engagement portion fits inside the female engagement portion, the first hook is engaged with the third hook and the second hook is engaged with the fourth hook, and   a force required for engaging the male engagement portion with the female engagement portion is in a range from 30 N/15 mm to 100 N/15 mm.   
     
     
         2 . The zipper tape according to  claim 1 , wherein
 each of the second hook and the fourth hook comprises a barb portion at a distal end, and each of the first hook and the third hook comprises, at a distal end, no barb portion or a barb portion having a larger angle than the barb portion of each of the second hook and the fourth hook,   the fourth hook comprises: a first raised portion that is raised obliquely with respect to the second base from a connection region of between the female engagement portion and the second base; a second raised portion that is continuous with the first raised portion and raised at an angle closer to a right angle than the first raised portion with respect to the second base; a bent portion that is continuous with the second raised portion; and the barb portion that is formed at a distal end of the bent portion, and   the first raised portion has a width of 0.35 mm or more.   
     
     
         3 . The zipper tape according to  claim 1 , wherein a minimum width of a connection region of between the female engagement portion and the second base is in a range from 1.0 mm to 1.8 mm. 
     
     
         4 . The zipper tape according to  claim 1 , wherein
 each of the second hook and the fourth hook comprises a barb portion at a distal end, and each of the first hook and the third hook comprises, at a distal end, no barb portion or a barb portion having a larger angle than the barb portion of each of the second hook and the fourth hook,   the fourth hook comprises: a first raised portion that is raised obliquely with respect to the second base from a connection region of between the female engagement portion and the second base; a second raised portion that is continuous with the first raised portion and raised at an angle closer to a right angle than the first raised portion with respect to the second base; a bent portion that is continuous with the second raised portion; and the barb portion that is formed at a distal end of the bent portion, and   the first raised portion has a length of 0.4 mm or less along a direction of erection.   
     
     
         5 . The zipper tape according to  claim 1 , wherein
 each of the third hook and the fourth hook comprises a raised portion that is raised from a connection region of between the female engagement portion and the second base; a bent portion that is continuous with the raised portion; and a barb portion that is formed at a distal end of the bent portion, and   the bent portions of the third hook and the fourth hook include outer surfaces to be brought into contact with the first hook and the second hook, respectively, when the male engagement portion is to fit inside the female engagement portion, and the outer surfaces form an angle of 145 degrees or more on an outer side of the female engagement portion.   
     
     
         6 . The zipper tape according to  claim 1 , wherein a minimum distance from an inner space of the female engagement portion defined between the third hook and the fourth hook to an opposite surface of the second base from the female engagement portion is 0.50 mm or more. 
     
     
         7 . The zipper tape according to  claim 1 , wherein
 the male engagement portion includes a first slant surface and a second slant surface between the first hook and the second hook, the first slant surface being continuous with the first hook, the second slant surface being continuous with the second hook, and   an angle formed by the first slant surface and the second slant surface inside the male engagement portion is 140 degrees or more.   
     
     
         8 . A zipper-tape-attached container comprising:
 a container body; and   the zipper tape according to  claim 1  with the first base and the second base being bonded to the container body.   
     
     
         9 . The zipper-tape-attached container according to  claim 8 , wherein the container body is in a form of a bag. 
     
     
         10 . A method of preventing falsification of contents in the zipper-tape-attached container according to  claim 8 , the method comprising: making the force required for engaging the male engagement portion with the female engagement portion larger than a usually assumable force.