Disinfection of packaged articles
An apparatus for generating ozone inside packaged articles comprises an electrode assembly in which coplanar electrodes are supported along a contact surface. The electrodes are solid state conductive electrodes. These electrodes may be interdigitated and/or arranged with uniform spacing therebetween along a portion of their length. Where the electrodes are straight they may be parallel, but other shapes can also be evenly spaced. In some examples the electrodes are partially insulated and partially exposed. In some examples the electrodes are embedded/potted in an insulator to exclude air spaces from around the electrodes.
1. A package disinfection apparatus, comprising:
an electrode support having a contact surface configured to contact a package to be disinfected; and
two conductive electrodes configured to receive an alternating voltage to enable generation of ozone between the electrodes such that, in use applying the electrodes to the package converts oxygen to ozone within said package,
wherein the two conductive electrodes each comprise a plurality of elongated fingers that are interdigitated at the contact surface.
2. The package disinfection apparatus of claim 1 in which at least one of the electrodes is substantially covered with an insulating material.
3. The package disinfection apparatus of claim 2 in which the electrodes comprise distributed impedances.
4. The package disinfection apparatus of claim 1 comprising a sensor for sensing pressure at the contact surface of the electrode support to enable control of the current based on the pressure.
5. The package disinfection apparatus of claim 1 in which at least one electrode is potted in an insulating material.
6. The package disinfection apparatus of claim 1 comprising a current sensor for sensing current flow between said electrodes in order to detect an over current condition and control means for preventing operation of the package disinfection apparatus in the event that an over current condition is detected.
7. The package disinfection apparatus of claim 1 wherein the two conductive electrodes are disposed in an electrode head providing the electrode support, wherein one of the two conductive electrodes is separated from the contact surface, and the other of the two conductive electrodes has a surface that is flush with the contact surface.
8. The package disinfection apparatus of claim 1 wherein the two conductive electrodes are arranged to be coplanar with each other.
9. The package disinfection apparatus of claim 8 , wherein a spacing between the two conductive electrodes is in a direction coplanar with the contact surface.
10. The package disinfection apparatus of claim 9 wherein the coplanar arrangement comprises an even spacing between the two conductive electrodes at the contact surface.
11. The package disinfection apparatus of claim 1 wherein the two conductive electrodes are parallel.
12. The package disinfection apparatus of claim 1 wherein the two conductive electrodes comprise edges, and a spacing is provided between the edges, the spacing being even along at least a portion of the length of the edges.
13. The package disinfection apparatus of claim 12 wherein the spacing between the edges of the two electrodes comprises a distance of the closest approach of the edges.
14. The package disinfection apparatus of claim 1 wherein the two conductive electrodes comprise a major dimension and a minor dimension, wherein the two conductive electrodes are aligned along their major dimension.
15. The package disinfection apparatus of claim 1 wherein the two conductive electrodes comprise a first electrode comprising a plurality of electrodes elements and a second electrode comprising a plurality of electrode elements, wherein the plurality of electrode elements of the first electrode are interleaved with the plurality of electrode elements of the second electrode.