HEAT INSULATION BOX MANUFACTURING METHOD AND HEAT INSULATION BOX
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United States of America Patent
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Issued Date -
May 9, 2019
app pub date -
Jan 7, 2019
filing date -
Jan 7, 2019
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Abstract
A method for manufacturing a heat insulation box, wherein said method involves disposing an outer box over the outside of an inner box such that there is space therebetween, covering an opening with an elastic sheet from the outside of the outer box, inserting a jig into the opening from the outside of the outer box to force the elastic sheet into the space between the inner box and the outer box, and injecting the urethane foam heat insulating material into the space between the inner box and the outer box so as to foam therein to form a recess with the elastic sheet tightly adhering to the surface thereof.
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