Patent ID: 6749703
Filing Date: 2004-06-15
Classification: B29C,B29L

Abstract:
A welding method for welding a reinforcing tape piece made of a synthetic resin to a fastener tape of a slide fastener chain over a core portion and a main tape portion in the fastener tape by ultrasonic heating, comprising the steps of:setting a first welding condition including at least one of a welding time and an amplitude which is suitable for welding the reinforcing tape piece to the core portion and the vicinity of the core portion; setting a second welding condition including at least one of a welding time and an amplitude which is suitable for welding the reinforcing tape piece to the main tape portion; welding the reinforcing tape piece to the core portion and the vicinity of the core portion based on the first welding condition; and welding the reinforcing tape piece to the main tape portion based on the second welding condition, wherein the first welding condition is different from the second welding condition.