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A coated membrane for use in controlling the oxygen and carbon dioxide ratio inside of a package that holds respiring produce such as fruits, vegetables or flowers. The coated membrane comprises a porous substrate, such as a polypropylene film, and has an oxygen permeance in the range of 5,000 to 30

A coated membrane for use in controlling the oxygen and carbon dioxide ratio inside of a package that holds respiring produce such as fruits, vegetables or flowers. The coated membrane comprises a porous substrate, such as a polypropylene film, and has an oxygen permeance in the range of 5,000 to 30,000,000 cc/100 in2-atmosphere-day. The substrate is coated with a material that is substantially impermeable to oxygen, such as an acrylic emulsion, so that the amount of substrate surface area covered with the coating causes a decrease in the oxygen permeance of the substrate. The coating is applied to the substrate using a flexographic or rotogravure or rotary silkscreen process. An aperture of approximately 0.15 mm is placed in the coated membrane to allow the internal pressure to approximate the external pressure without a significant loss of relative humidity.

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1. A membrane member for regulating the ratio of oxygen and carbon dioxide inside of a container that holds respiring items comprising:a non-fibrous substrate having a permeability to oxygen in the range of 5,000 to 30,000,000 cc/100 in2-atmosphere-day; a coating applied to a surface of the substrat

1. A membrane member for regulating the ratio of oxygen and carbon dioxide inside of a container that holds respiring items comprising:a non-fibrous substrate having a permeability to oxygen in the range of 5,000 to 30,000,000 cc/100 in2-atmosphere-day; a coating applied to a surface of the substrate in a specific pattern chosen to have some wholly uncoated area, said coating facilitating a decrease in said permeability to oxygen by fifteen percent to ninety percent; and said membrane member having an aperture wherein said aperture has a diameter sized between 0.025 mm and 0.25 mm.