| http://www.w3.org/ns/prov#value | - A strip of impervious material 22, which may be plastic film, metal foil or other suitable material, is fastened to the bottom of the tray l@ by means of a discontinuous pattern of adhesive 24 which securely bonds the impervious barrier layer 22 to the tray 10 without impeding the flow of free moisture onto the upper surface of the tray bottom l2.
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