Coupling/uncoupling method, plastic coupler and envelop, bag and binder

Abstract

A plastic fastener having a first segment 10 A with a protrusion 12 formed on a first base 11 , the protrusion 12 having a stopper hook on its end and having identical sections in a direction shown by arrow B, and a second segment 10 B with a groove 16 formed on a second base 15 , the groove being for nipping the hook of the protrusion 12 and having identical section in the direction shown by arrow B. The protrusion 12 and the groove 16 come into engagement with each other by pressures in directions shown by A and A′ applied from respective back sides of the first base 11 and the second base 15 , and the engagement is not canceled by forces in directions opposite to the directions A and A′. The engagement can be canceled only by sliding the protrusion 12 together with the first base 11 and the groove 16 together with the second base 15 in directions shown by arrow B and B′.

1 . A fastening/unfastening method using a plastic fastener comprising a first segment produced by extrusion molding a long first segment such that a first base and a protrusion formed on a front surface of the first base have identical sections in one direction and by cutting the long first segment into pieces with a specified length, and a second segment produced by extrusion molding a long second segment such that a second base and a groove formed on a front surface of the second base have identical sections in one direction and by cutting the long second segment into pieces with a specified length, wherein: 
 the protrusion and the groove are engaged with each other by pressures applied from respective back sides of the first base and the second base; and    the engagement of the protrusion and the groove is canceled only by sliding the protrusion together with the first base in the direction where the protrusion has identical sections and by sliding the groove together with the second base in the direction where the groove has identical sections.    
   
   
       2 . A fastening/unfastening method according to  claim 1 , wherein: 
 the engagement of the protrusion with the groove by pressures    the engagement of the protrusion with the groove by pressures applied from the respective back sides of the first base and the second base is not canceled in directions opposite to the pressing directions for the engagement; and    the engagement of the protrusion and the groove is canceled only by sliding the protrusion together with the first base in the direction where the protrusion has identical sections and by sliding the groove together with the second base in the direction where the groove has identical sections.    
   
   
       3 . A plastic fastener comprising a first segment produced by extrusion molding a long first segment such that a first base and a protrusion formed on a front surface of the first base and having a stopper hook on its end have identical sections in one direction and by cutting the long first segment into pieces with a specified length, and a second segment produced by extrusion molding a lone second segment such that a second base and a groove formed on a front surface of the second base to nip the stopper hook of the protrusion have identical sections in one direction and by cutting the long second segment into pieces with a specified length, wherein: 
 the protrusion and the groove are engaged with each other by pressures applied from respective back sides of the first base and second base; and    the engagement of the protrusion and the groove is canceled only by sliding the protrusion together with the first base in the direction where the protrusion has identical sections and by sliding the groove together with the second base in the direction where the groove has identical sections.    
   
   
       4 . A plastic fastener according to  claim 3 , wherein each of the first base and the second base has a plurality of protrusions formed side by side thereon, so that grooves are made between the protrusions on each of the first base and the second base.  
   
   
       5 . A plastic fastener according to  claim 3 , wherein the first segment with the protrusion on the first base and the second segment with the groove on the second base have identical sections with each other.  
   
   
       6 . A plastic fastener according to  claim 3 , wherein adhesive layers are provided on the respective back sides of the first base and the second base.  
   
   
       7 . An envelope comprising a main body and a lid for covering an opening portion of the main body, further comprising: 
 the first segment and the second segment as set forth in  claim 3  on the main body and on the lid, respectively, at positions opposite to each other.    
   
   
       8 . A bag comprising the first segment and the second segment as set forth in  claim 3  on an inner surface in an opening portion, at positions opposite to each other.  
   
   
       9 . A tie comprising the first segment and the second segment as set forth in  claim 3  on both ends, respectively.