One-way valve score design
In flexible package, a one-way valve may include a substrate forming a portion of the flexible package and having at least one inlet score, a top sheet having at least one outlet score and secured thereto by an adhesive to define a valve chamber in which the substrate and the top sheet are not permanently adhered to each other, and a liquid film within the valve chamber and adhering the top sheet to the substrate within the valve chamber until a pressure differential exists causing gases to pass through the one-way valve. The inlet scores and the outlet scores may be non-linear, or may be linear scores that are not parallel to each other to prevent the scores from collapsing on themselves and preventing gas flow when the package buckles.
1. A one-way valve for a flexible package, the one way valve comprising:
a substrate forming a portion of the flexible package and having at least one inlet score;
a top sheet having at least one outlet score;
an adhesive disposed between the substrate and the top sheet and adhering the top sheet to the substrate, wherein the substrate, the top sheet and the adhesive define a valve chamber in which the substrate and the top sheet are not permanently adhered to each other, wherein the at least one inlet score fluidly connects an interior of the flexible package to the valve chamber and the at least one outlet score fluidly connects the valve chamber to an ambient atmosphere surrounding the flexible package; and
a liquid film occupying at least a portion of the valve chamber and adhering the top sheet to the substrate within the valve chamber to prevent gas within the flexible package from passing through the one-way valve when a pressure differential between an internal pressure of the flexible package and an ambient air pressure is less than a minimum gas release pressure differential,
wherein the at least one outlet score comprises a plurality of arc-shaped outlet scores arranged in an outlet score circular pattern and the at least one inlet score comprises a plurality of arc-shaped inlet scores arranged in an inlet score circular pattern; and
the inlet score circular pattern is rotated 45° relative to the outlet score circular pattern.
2. The one-way valve of claim 1 , wherein the plurality of arc-shaped outlet scores comprises four arc-shaped outlet scores and the plurality of arc-shaped inlet scores comprises four arc-shaped inlet scores.
3. A one-way valve for a flexible package, the one-way valve comprising:
a substrate forming a portion of the flexible package and having at least one inlet score:
a top sheet having at least one outlet score;
an adhesive disposed between the substrate and the top sheet and adhering the top sheet to the substrate, wherein the substrate, the top sheet and the adhesive define a valve chamber in which the substrate and the top sheet are not permanently adhered to each other, wherein the at least one inlet score fluidly connects an interior of the flexible package to the valve chamber and the at least one outlet score fluidly connects the valve chamber to an ambient atmosphere surrounding the flexible package; and
a liquid film occupying at least a portion of the valve chamber and adhering the top sheet to the substrate within the valve chamber to prevent gas within the flexible package from passing through the one-way valve when a pressure differential between an internal pressure of the flexible package and an ambient air pressure is less than a minimum gas release pressure differential, wherein:
the at least one outlet score comprises four linear outlet scores arranged in an outlet score square pattern;
the at least one inlet score comprises four linear inlet scores arranged in an inlet score square pattern; and
the inlet score square pattern is rotated 45° relative to the outlet score square pattern.
4. A one-way valve for a flexible package, the one-way valve comprising:
a substrate forming a portion of the flexible package and having at least one inlet score:
a top sheet having at least one outlet score;
an adhesive disposed between the substrate and the top sheet and adhering the top sheet to the substrate, wherein the substrate, the top sheet and the adhesive define a valve chamber in which the substrate and the top sheet are not permanently adhered to each other, wherein the at least one inlet score fluidly connects an interior of the flexible package to the valve chamber and the at least one outlet score fluidly connects the valve chamber to an ambient atmosphere surrounding the flexible package; and
a liquid film occupying at least a portion of the valve chamber and adhering the top sheet to the substrate within the valve chamber to prevent gas within the flexible package from passing through the one-way valve when a pressure differential between an internal pressure of the flexible package and an ambient air pressure is less than a minimum gas release pressure differential, wherein:
the at least one outlet score comprises three linear outlet scores arranged in an outlet score triangle pattern;
the at least one inlet score comprises three linear inlet scores arranged in an inlet score triangle pattern; and
the inlet score triangle pattern is rotated 60° relative to the outlet score triangle pattern.
5. A method of producing a one-way valve for a flexible package, comprising:
forming at least one inlet score on a substrate of the flexible package, wherein the at least one inlet score comprises a plurality of inlet scores arranged in an inlet score pattern;
forming at least one outlet score on a top sheet of the one-way valve, wherein the at least one outlet score comprises a plurality of outlet scores arranged in an outlet score pattern that is rotated 45° or 60° relative to the inlet score pattern;
applying an adhesive to an outer surface of the substrate that defines a boundary around the at least one inlet score, wherein the substrate, the top sheet and the adhesive define a valve chamber in which the substrate and the top sheet are not permanently adhered to each other, wherein the at least one inlet score fluidly connects an interior of the flexible package to the valve chamber and the at least one outlet score fluidly connects the valve chamber to an ambient atmosphere surrounding the flexible package; and
applying a liquid film to at least a portion of the substrate outer surface within the boundary defined by the adhesive to adhere the top sheet to the substrate within the valve chamber to prevent gas within the flexible package from passing through the one-way valve when a pressure differential between an internal pressure of the flexible package and an ambient air pressure is less than a minimum gas release pressure differential.
6. The method of claim 5 , wherein forming at least one outlet score comprises forming a plurality of arc-shaped outlet scores arranged in an outlet score circular pattern.
7. The method of claim 5 , wherein forming at least one outlet score comprises forming four linear outlet scores arranged in an outlet score square pattern.
8. The method of claim 5 , wherein forming at least one outlet score comprises forming three linear outlet scores arranged in an outlet score triangle pattern.
9. The method of claim 5 , wherein forming at least one outlet score comprises forming at least one zigzag-shaped outlet score.
10. The method of claim 5 , wherein forming at least one outlet score comprises forming at least one serpentine-shaped outlet score.