Abstract: In a slide fastener made of fabric having a stopper portion composed of thermoplastic synthetic resin material, the fastener tape contains a rough-pattern-structure region at least adjacent to a side of the fastener element row on an inner side of the fastener tape. An end portion of the stopper portion on the inner side of the fastener tape is disposed in the rough-pattern-structure region and fused to a foundation structure of the fastener tape in the rough-pattern-structure region. Thus, even if the length of the stopper portion in the tape width direction is short, the stopper portion does not interfere with a sewing machine foot during sewing, so that the sewing line does not meander even at the position near the fastener element row. Further, the end portion of the stopper portion can be fused and fixed to the foundation structure of the rough-pattern-structure region.

Abstract: A method for welding synthetic resin members includes the steps of detecting a temperature of a high frequency electrode or an ultrasonic horn (or an anvil) by a temperature detector, cooling the high frequency electrode or the ultrasonic horn (or the anvil) by cooling means when the temperature detected by the temperature detector during a high frequency or ultrasonic vibration exceeds a preset temperature range, thereby reducing the temperature rapidly down to the preset temperature range, and stopping an operation of the cooling means when the temperature of the high frequency electrode or the ultrasonic horn (or the anvil) is reduced to the preset temperature range.