Moisture Retention Seal

Abstract

Provided is a moisture retention seal for use with a package. The moisture retention seal includes an opened-ended canister having a plurality of canister sealing surfaces. Snap-fitted with spatial interference to the canister at its opened-end, is a moisture retention closure having a plurality of closure sealing surfaces. Each canister sealing surface cooperates with a corresponding one of the closure sealing surfaces to form a plurality of partial seals. At least one of the partial seals includes a micro-bead surface comprising one or more small, inwardly directed, narrowly spaced-apart, micro-bead elements. The package that includes a moisture retention seal of the present invention employs only molded parts and does not require gaskets or secondary seals.

1 . A package comprising:
 a closure having an interior surface and a protrusion extending from the interior surface; and   a canister having a flexible top portion, the protrusion contacting the flexible top portion of the canister, the protrusion normally applying a generally downward contact force to at least part of the flexible top portion to form a top seal between the closure and the canister, the protrusion deflecting the part of the flexible top portion generally downwardly from a rest position,   wherein the flexible top portion of the canister is in the rest position when not connected with the closure,   wherein the closure has a top undercut surface extending circumferentially about the top interior surface, and the canister has a sidewall surface circumferentially extending about the canister, the top undercut surface cooperating with the sidewall surface to form an undercut seal.   
   
   
       2 . The package as defined by  claim 1  wherein the top undercut surface is radially inward of the protrusion. 
   
   
       3 . The package as defined by  claim 1  wherein the protrusion is generally annular.