| 摘要 |
PCT No. PCT/JP96/00710 Sec. 371 Date Apr. 25, 1997 Sec. 102(e) Date Apr. 25, 1997 PCT Filed Mar. 15, 1996 PCT Pub. No. WO97/34817 PCT Pub. Date Sep. 25, 1997The present invention provides a heat insulated vessel (A) which is suitable for containing convenience food which can be cooked by hot water, or food or drink which is desired to be eaten or drunk while it is hot, and also a method of producing the vessel. The heat insulated vessel (A) of the present invention is made of a formed product of a foamed synthetic resin. An annular flange is continuous with an opening edge of a bottomed cylindrical portion, and a curled portion which is thinner than the bottomed cylindrical portion and which has a curved section shape is continuous with the annular flange. Preferably, the thickness of the curled portion is 1.5 mm or less. In the production method of the present invention, a skirt portion of an intermediate formed product which is made of a foamed synthetic resin is made thinner than a barrel wall portion of the bottomed cylindrical portion, and the skirt portion is gradually sent in a groove which is made in a forming die and in which the width is gradually reduced, in a direction from a larger groove width to a smaller groove width, while rotating the skirt portion in the groove and heating the skirt portion, thereby forming the skirt portion into a curved section shape to make the curled portion.
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