Tape-shaped molding and belt for ball chain

Abstract

A tape-shaped product and a belt for a ball chain are provided. A tape-shaped product of synthetic resin includes a tape of a thermoplastic resin, and a preliminarily stretched fibrous member of a thermoplastic resin contained therein along longitudinally parallel edges or in proximity thereto of the tape. A belt for a ball chain, includes a tape-shaped product of synthetic resin formed by injection molding, together with a fibrous member as an insert of a resin of the same kind as that of the fibrous member so that the fibrous member is disposed along the longitudinal edges or in proximity thereto, ball-insetting holes are disposed at equal intervals, and ball-retaining projections are disposed around the holes.

1 . A tape-shaped product of synthetic resin, comprising: a tape of a synthetic resin, and a stretch-oriented fibrous member of a thermoplastic resin contained therein along longitudinally parallel edges or in proximity thereto of the tape;
 wherein said thermoplastic resin forming the fibrous member and said synthetic resin forming the tape comprise substantially identical resins.   
     
     
         2 . A tape-shaped product of synthetic resin according to  claim 1 , wherein the fibrous member is in the form of a monofilament. 
     
     
         3 . A tape-shaped product of synthetic resin according to  claim 1 , having a longitudinal tensile strength of at least 250 MPa and a thermal shrinkability of at most 1%. 
     
     
         4 - 7 . (canceled) 
     
     
         8 . A method of producing a belt for ball chain, comprising:
 setting, in a mold, balls for molding each having a diameter slightly larger than balls to be retained in a resultant shaped product so as to be aligned in a straight line along a central portion of the resultant shaped product, and a stretch-oriented fibrous member comprising a thermoplastic resin so as to be contained along longitudinally parallel edges or in proximity thereof of the resultant shaped product,   injection-molding a moldable synthetic resin comprising a substantially identical resin as the thermoplastic resin forming the stretch-oriented fibrous member to form a tape portion and a retaining portion integrally, and   then removing the balls for molding to leave holes for retaining balls of the ball chain, thereby to form a belt for ball chain which comprises:
 (i) a tape-shaped product of synthetic resin, comprising: a tape of a synthetic resin, and a stretch-oriented fibrous member of a thermoplastic resin contained therein along longitudinally parallel edges or in proximity thereto of the tape;
 wherein said thermoplastic resin forming the fibrous member and said synthetic resin forming the tape comprise substantially identical resins, and 
 
 (ii) the holes for retaining balls of the ball chain along the central portion of the tape-shaped product. 
   
     
     
         9 . A method of producing a belt for ball chain according to  claim 8 , wherein the fibrous member is in a form of a monofilament. 
     
     
         10 . A tape-shaped product of synthetic resin according to  claim 2 , having a longitudinal tensile strength of at least 250 MPa and a thermal shrinkability of at most 1%. 
     
     
         11 . A tape-shaped product of synthetic resin according to  claim 1 , wherein said thermoplastic resin forming fibrous member and said thermoplastic resin forming the stretch-oriented fibrous member comprise identical resins or include identical resins as principle components. 
     
     
         12 . A method of producing a belt for ball chain according to  claim 8 , wherein said thermoplastic resin forming the fibrous member and said thermoplastic resin forming the stretch-oriented fibrous member comprise identical resins or include identical resins as principle components.