| 摘要 |
There is provided a method and apparatus for processing a thinly walled tube of thermoplastic resin to produce a tubular container having an inwardly directed flange section in a hole formed at an end of the thinly walled tube. In the first step, the thinly walled tube is secured to a tube holder provided with a male mold for molding the flange section in the hole and forming an opening located inside the flange section. The front end of the thinly walled tube projects by a predetermined distance from the front end of the tube holder. Then, in the second step, hot air is blown to an inner wall surface of the thinly walled tube at and near the front end thereof and the outer wall surface of the thinly walled tube is cooled also at and the front end thereof, to produce a temperature difference between an inside and an outside of the thinly walled tube, so as to deform the front end of the thinly walled tube into a flange projecting radially. When the inner wall surface is heated to a temperature lower than a melting point of the inner layer, the front end of the thinly walled tube is deformed inwardly. When the inner wall surface is heated to a temperature higher than the melting point of the inner layer, the front end of the thinly walled tube is deformed outwardly. Finally, in the third step, the deformedfront end of the thinly walled tube is molded into the flange section showing a predetermined shape and forming the opening located inside the flange section by means of a female mold cooperating with said male mold.
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