Abstract: A method of producing a tubular container which can efficiently and integrally produce a thinly walled neck section on the tubular container without altering the appearance and profile of the container. The method of producing a tubular container comprises the first step of arranging a thinly walled tube to a tube holder, the second step of softening the inside of the front end of the thinly walled tube, the third step of shrinking the front end of the thinly walled tube, and the fourth step of forming a neck section and a shoulder section to the front end of the thinly walled tube by means of a male mold. After heating the thinly walled tube with hot air, the air is drawn and removed, and the outer wall surface is cooled so as to make the subsequent steps to be conducted smoothly and efficiently. Since hot air is drawn after heating the outer wall surface, a thinly walled tapered shoulder section can be produced without altering the appearance and profile of the tubular container.

Abstract: A method and apparatus process 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 a 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 a 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 near the front end thereof. This produces 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.

Abstract: A synthetic resin sheet integrally coextruded by coextruding sheet main body portions and a slender notching strip interposed between right and left side sheet main body portions, wherein the notching strip is formed of a mixture resin material of a first synthetic resin material of molding material of the sheet main body portions, a second synthetic resin material impossible to be bonded with the first synthetic resin material, a third synthetic resin material possible to be bonded with the first and second synthetic resin materials, and a fourth synthetic resin material for softening the molded notching strip, melt index value of the notching strip is the same as or substantially lower than that of the main body portions, and the softening temperature of the notching strip is the same as or substantially higher than that of the sheet main body portions, and a thermally molded container formed of the sheet, thereby smoothly and clearly separating the sheet main body portions and the notching strip of the she