Method for making double-walled insulating metal container
AssigneeNippon Sanso Corporation
InventorsShouji Toida, Shigeru Tsuchiya, Keiki Ariga, Seiichi Itoh, Hidetoshi Ohta
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Abstract
This invention relates to a method of making a double-walled thermally insulating metal container comprising an inner casing and an outer casing having an evacuation opening. A quantity of joining material is placed near or on the evacuation opening so as to cover the opening partially or completely. The assembly is treated in a vacuum furnace to evacuate the insulating space, to melt the joining material and to solidify the joining material in situ to provide vacuum sealing without resorting to a conventional sealing plate.
Claims7
A method for making a thermally insulating metal container comprising the steps of:
- (a) preparing an inner casing having a mouth portion;
- (b) preparing an outer casing having a mouth portion, a bottom portion, and an evacuation opening of a given shape provided in the outer casing and having a length not exceeding a diameter at one end remote from the mouth portion of said outer casing;
- (c) joining the mouth portions of each casing to each other and fitting the bottom portion to the diameter of said one end of said outer casing thereby forming a container assembly, and defining an insulating space enclosed by the inner casing and the outer casing;
- (d) placing a quantity of a joining material near the evacuation opening so that said joining material upon melting will flow into the evacuation opening;
- (e) vacuum heating said assembly with the joining material disposed near the evacuation opening of said outer casing so as to vacuumize the insulating space;
- (f) raising a temperature of the joining material so as to liquify the joining material to cover and to seal the evacuation opening completely;
- (g) lowering the temperature of the joining material to solidify the joining material to seal off the evacuation opening;
- and
- (h) maintaining the shape of the evacuation opening substantially constant during the temperature raising step.
A method of making a thermally insulating metal container comprising the steps of:
- (a) preparing an inner casing having a mouth portion;
- (b) preparing an outer casing having a mouth portion, a bottom portion, and an evacuation opening of a given shape provided in the outer casing and having a length not exceeding a diameter at one end remote from the mouth portion of said outer casing;
- (c) joining the mouth portions of each casing to each other and fitting the bottom portion to the diameter of said one end of said outer casing thereby forming a container assembly, and defining an insulating space enclosed by the inner casing and the outer casing;
- (d) placing a quantity of a compounded joining material consisting substantially of a binder and a joining material on the evacuation opening so as to completely cover the evacuation opening;
- (e) vacuum heating said assembly so as to vaporize the binder from the compounded joining material and to simultaneously vacuumize the insulating space;
- (f) raising a temperature of the compounded joining material so as to liquify the compounded joining material to cover and to seal the evacuation opening completely;
- (g) lowering the temperature of the compounded joining material to solidify the compounded joining material to seal off the evacuation opening;
- and
- (h) maintaining the shape of the evacuation opening substantially constant during the temperature raising step.
Dependencies are inferred from the claim text.