JPS5581029A - Production of double bottom vessel made of metal foil - Google Patents

Abstract

PURPOSE: To produce the double bottom vessels made of metal foils at less number of steps, low cost and good efficiency by blanking the inside plate and outside plate constituting the vessel bottom so as to hermetically seal air therebetween from two sheets of working materials.

CONSTITUTION: A working material 7 for inside plate and working material 8 for outside plate let off from two metal foil coils 9, 10 and formed with a required gap in their moving path by a round-bar-form guide 11 are supplied between the upper die 5 provided with a female die and lower die 6 provided with a male die of a press machine. The inside plate 2 and outside plate 3 are simultaneously blanked from the working materials 7, 8 and the outside circumferential edge parts of the inside and outside plates 2, 3 are mutually compression bonded by shearing, whereby air is hermetically sealed therebetween. Thence, the inside plate 2 and outside plate 3 of the portions other than the bottom of a vessel 1 are closely contacted by the male die 12 and female die 13 to move the air having existed therebetween to the bottom part. Now, the outside plate 3 is pressed to the bottom of the female die 13 and the inside plate 2 is pressed by the concave part 12a of the male die 12, whereby these are molded and an air layer A is formed between the inside plate 2 and outside plate 3, thus the desired double bottom vessel made of metal foils is produced.

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