of each of the fastener tapes the reinforcing tape comprising a transparent elastomer film and an adhesive layer superposed on the reverse side of the elastomer film is attached by welding or fusion bonding to the terminal part of the dyed fastener tape through the medium of the adhesive layer and has a knurled surface at the welded part application_number US 63818096 A description now a preferred embodiment of the present invention will be described below with reference to the accompanying drawings fig1 and fig2 each show the lower part of a slide fastener 1 having the reinforcing tapes 3a and 3b of the present invention provided in the parts used for attachment of a separable insertion joint at the lower end parts of a pair of fastener tapes 2a and 2b fig2 shows the lower part of the slide fastener which is held in a separated state the slide fastener 1 shown in fig1 includes a pair of fastener tapes 2a and 2b a pair of reinforcing tapes 3a and 3b which are welded or fused to the lower end parts of the respective fastener tapes 2a and 2b rows of coupling elements 4a and 4b such as spiral coil coupling elements attached to the inner longitudinal edges of the respective fastener tapes 2a and 2b a slider 5 and a separable insertion joint or pin and box separator composed of an insertion member or hinge bar 6 a box bar 7 and a box member 8 these members being secured to the inner edges of the reinforcing tapes 3a and 3b which are welded to the lower end parts of fastener tapes 2a and 2b the slider 5 is slidably mounted on the rows of coupling elements 4a.