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US 2017/0360936 A1Published application
Devices and methods for controlling headspace humidity and oxygen levels
AssigneeBoveda, Inc.
InventorsDavid C. Egberg, Robert L. Esse
Life of this patent
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Abstract
A humidity control device for use in maintaining the desired humidity of a closed environment, e.g., a container, while also decreasing headspace oxygen, the device including a water vapor and oxygen permeable pouch, an aqueous salt solution containing humidity controlling salts in combination with salts of ascorbic acid or isomers thereof.
Claims20
A liquid humidity and oxygen control device for use in an enclosure for maintaining a desired relative humidity and oxygen level of the enclosure, comprising:
- (a) a water vapor and oxygen permeable and liquid impermeable pouch, the pouch formed from material comprising a water vapor transmission rate and an oxygen transmission rate and defining an interior space within the pouch;
- and
- (b) an effective amount of a humidity and oxygen control solution disposed within the interior space and comprising:
- a saturated aqueous salt solution,
- salts of ascorbate isomers containing an amount of a salt solution from about 5% to 70% salt, and
- ascorbic acid salts, or isomers thereof, from 5 to 60%,
- wherein the water vapor transmission rate of the pouch material comprises transmission of about 1% to about 50% by weight of the initial pouch contents in a 24-hour period when exposed to an atmosphere of less than 10% relative humidity and absorption of about 1% to about 50% by weight of the initial pouch content when exposed to an atmosphere having a relative humidity of 85%, and
- wherein the oxygen transmission rate of the pouch material is such that 20 in2 of the pouch material will transfer a minimum of 80 ml of headspace oxygen over 20 days at 70 degrees F. and atmospheric pressure.
5 more elements
A method for controlling the oxygen and humidity within an enclosure, comprising:
- providing an impermeable enclosure comprising an interior volume and a closure mechanism;
- contacting the interior volume with a humidity and oxygen control device comprising:
- (a) a water vapor and oxygen permeable and liquid impermeable pouch, the pouch formed from material comprising a water vapor transmission rate and an oxygen transmission rate and defining an interior space within the pouch;
- and
- (b) an effective amount of a humidity and oxygen control solution disposed within the interior space and comprising:
- a saturated aqueous salt solution,
- salts of ascorbate isomers containing an amount of a salt solution from about 5% to 70% salt, and
- ascorbic acid salts, or isomers thereof, from 5 to 60%,
- wherein the water vapor transmission rate of the pouch material comprises transmission of about 1% to about 50% by weight of the initial pouch contents in a 24-hour period when exposed to an atmosphere of less than 10% relative humidity and absorption of about 1% to about 50% by weight of the initial pouch content when exposed to an atmosphere having a relative humidity of 85%, and
- wherein the oxygen transmission rate of the pouch material is such that 20 in2 of the pouch material will transfer a minimum of 80 ml of headspace oxygen over 20 days at 70 degrees F. and atmospheric pressure.
7 more elements
Dependencies are inferred from the claim text.