Liner-provided cap and cap-provided threaded container

Abstract

Provided is a liner-provided cap for sealing the mouthpiece of a threaded container, which includes the cap shell 4 consisting of the top plate 2 and the tubular peripheral wall section 3 that hangs from the peripheral edge of the top plate 2 , and the synthetic resin liner 5 provided on the inner surface of the top plate 2 . The liner 5 includes the disk-shaped rigid sheet 5 a disposed in contact with the inner surface of the top plate 2 , and the soft layer 5 b that is laminated to the rigid sheet 5 a and is more flexible than the rigid sheet 5 a . The soft layer 5 b is concentric with the rigid sheet 5 a and is formed in an annular or disk shape with a diameter smaller than that of the rigid sheet 5 a so that the soft layer 5 b can be brought into contact with at least the mouthpiece.

1 . A liner-provided cap for sealing a mouth of a threaded container, comprising:
 a cap body consisting of a top plate and a tubular peripheral wall section that hangs from the peripheral edge of the top plate; and   a synthetic resin liner provided on the inner surface of the top plate, the liner comprising:
 a disk-shaped rigid sheet disposed in contact with the inner surface of the top plate; and 
 a soft layer that is laminated to the rigid sheet and is more flexible than the rigid sheet, 
   wherein the soft layer is concentric with the rigid sheet and is formed in an annular or disk shape with a diameter smaller than that of the rigid sheet so that the soft layer can be brought into contact with at least the mouth.   
   
   
       2 . The liner-provided cap according to  claim 1 , wherein the rigid sheet is formed of polypropylene resin and the soft layer is formed of styrene elastomer. 
   
   
       3 . The liner-provided cap according to  claim 1 , wherein t×f is set to 150 or more when the thickness of the rigid sheet is set as t(mm) and the flexural modulus is set as f(MPa). 
   
   
       4 . The liner-provided cap according to  claim 1 , wherein the tubular peripheral wall section includes a liner stopping protrusion protruding toward the interior thereof and supporting the liner from the underside thereof,
 when the inner diameter of the tubular peripheral wall section is set as D 0  and the protruded length of the liner stopping protrusion is set as w, the outer diameter D 1  of the rigid sheet is set in a range of D 0 ≧D 1 >D 0 -2w, and   when the central diameter of the mouth is set as R 1 , the outer diameter d 1  of the soft layer is set in a range of D 0 -2w>d 1 >R 1 .   
   
   
       5 . The liner-provided cap according to  claim 1 , wherein a non-volatile organic liquid is applied between the top plate and the liner. 
   
   
       6 . The liner-provided cap according to  claim 5 , wherein when the area of the liner is S(cm 2 ) and the coating amount of the non-volatile organic liquid is set as Y(mg), the coating amount of the non-volatile organic liquid is represented as the relationship of Y=αS, where α falls within a range of 0.01 to 1.00. 
   
   
       7 . The liner-provided cap according to  claim 5 , wherein the non-volatile organic liquid is silicone oil or glycerin. 
   
   
       8 . A threaded container having a liner-provided cap, wherein the liner-provided cap is the liner-provided cap according to any one of  claims 1  to  7 . 
   
   
       9 . A liner-provided cap for sealing a mouth of a threaded container body, comprising:
 a cap body consisting of a top plate and a tubular peripheral wall section that hangs from the peripheral edge of the top plate; and   a liner provided on the inner surface of the top plate, the liner comprising:
 a sliding layer disposed in contact with the inner surface of the top plate; 
 a sealing layer that is laminated to the sliding layer and is more flexible than the sliding layer; 
 an intermediate layer disposed between the sliding layer and the sealing layer and having gas-barrier property; and 
 an adhesive layer disposed between the intermediate layer and the sliding layer or the sealing layer to adhere to each other. 
   
   
   
       10 . The liner-provided cap according to  claim 9 , wherein the intermediate layer is formed of a metal foil. 
   
   
       11 . The liner-provided cap according to  claim 9 , wherein the intermediate layer is formed of a gas barrier resin. 
   
   
       12 . The liner-provided cap according to  claim 9 , wherein the intermediate layer is a material of which an adhesive strength to the sealing layer is lower than that to the sliding layer, and the adhesive layer is formed of the same material as that of the sliding layer. 
   
   
       13 . The liner-provided cap according to  claim 9 , wherein the sealing layer is molded. 
   
   
       14 . The liner-provided cap according to  claim 9 , wherein the sealing layer is formed of styrene elastomer. 
   
   
       15 . A cap-provided threaded container, wherein the cap is the liner-provided cap according to any one of  claims 9  to  14 .