Cork stopper coated with resin layer

Abstract

A cork stopper coated with a resin layer having a columnar cork stopper body formed by a compression molding of a cork granule with a binder resin, and a resin coating layer covering an outer circumferential surface of the cork stopper from an end side to another end of the cork stopper body along an axial direction. The cork stopper body and the resin coating layer constitute a core portion, and the core portion, when being pressed in a hollow tubular portion with a tightening allowance of 1.5 mm, experiencing a compression stress of 100N to 300N in case of a moisture content ratio of the core portion being 6 percent by weight and experiencing a compression stress 100N to 150N smaller than that in case of a moisture content ratio of the core portion being 2 percent by weight.

1 . A cork stopper coated with a resin layer comprising: a columnar cork stopper body formed by a compression molding of a cork granule with a binder resin; and a resin coating layer covering an outer circumferential surface of the cork stopper from an end side to another end of the cork stopper body along an axial direction,
 the cork stopper body and the resin coating layer constituting a core portion, and   the core portion, when being pressed into a hollow tubular portion with a tightening allowance of 1.5 mm, experiencing a compression stress of 100N to 300N in case of a moisture content ratio of the core portion being 6 percent by weight and experiencing a compression stress 100N to 150N smaller than that in case of a moisture content ratio of the core portion being 2 percent by weight.   
     
     
         2 . The cork stopper coated with the resin layer as set forth in  claim 1 , wherein the cork stopper body is formed by a compression molding executed in a centrifugal direction. 
     
     
         3 . The cork stopper coated with the resin layer as set forth in  claim 1 , wherein the cork stopper body has an attachment hole configured to attach a flange portion, the attachment hole extending from the end side to the other end side of the cork stopper body along the axial direction. 
     
     
         4 . The cork stopper coated with the resin layer as set forth in  claim 3 , wherein the cork stopper coated with the resin layer further comprises an expanding portion with a diameter larger than an outer diameter of another portion of the core portion, the expanding portion extending from a region corresponding to a bottom of the attachment hole to the other end of the cork stopper body. 
     
     
         5 . The cork stopper coated with the resin layer as set forth in  claim 4 , wherein the expanding portion is formed by heating the core portion. 
     
     
         6 . The cork stopper coated with the resin layer as set forth in  claim 1 , wherein the resin coating layer is made of polyethylene terephthalate. 
     
     
         7 . The cork stopper coated with the resin layer as set forth in  claim 1 , wherein the resin of the coating layer includes a lubricant. 
     
     
         8 . The cork stopper coated with the resin layer as set forth in  claim 2 , wherein the cork stopper body has an attachment hole configured to attach a flange portion, the attachment hole extending from the end side to the other end side of the cork stopper body along the axial direction. 
     
     
         9 . The cork stopper coated with the resin layer as set forth in  claim 8 , wherein the cork stopper coated with the resin layer further comprises an expanding portion with a diameter larger than an outer diameter of another portion of the core portion, the expanding portion extending from a region corresponding to a bottom of the attachment hole to the other end of the cork stopper body. 
     
     
         10 . The cork stopper coated with the resin layer as set forth in  claim 9 , wherein the expanding portion is formed by heating the core portion.