Patent ID: 7284681

Claim:
A structure for joining a sheet member and a tubular member in a pouch container, comprising: a two-layer resin tube having a nonfusible material arranged on the inside and a fusible material arranged on the outside; a heat-shrinkable tube; a joint tube formed by fusing the resin tube to the inside of a lower end of the heat-shrinkable tube so that the resin tube protrudes a prescribed amount from the lower end of the heat-shrinkable tube; a pouch container body having an upper end opening; and a pouring port provided with a joint portion for joining the pouring port to the container body, the joint portion having at least one groove formed therein in the circumferential direction; wherein a lower portion of said joint tube is inserted in the upper end opening of the container body, and the container body and the heat-shrinkable tube of the joint tube are fused and then the container body and the resin tube of the joint tube are fused separately, and wherein the joint portion of the pouring port is inserted in the joint tube, and the joint tube is heated to shrink the heat-shrinkable tube in order to fasten the joint portion of the pouring port to the joint tube.