Plastic cap having a pouring protrusion

Abstract

[Problems] To provide a plastic cap having a pouring cylinder capable of pouring the content liquid smoothly maintaining a constant liquid width even in case the degree of inclination of a container is varied to some extent at the time of pouring the content liquid, and of easily adjusting the liquid quantity. [Means for Solution] A bill 20 is formed at an upper end portion of the pouring cylinder 11 provided in a top panel 5 of a cap body 1 , the bill 20 protruding outward in an inclined manner, a lower end of the pouring cylinder 11 is forming a seal surface 17 of nearly a cylindrical shape, a groove 30 is formed in the inner surface of the bill 20 in the pouring cylinder 11 and is extending from an upper end portion of the seal surface 17 up to an upper end of the bill 20 , and a seal ring 29 is formed on the inner surface of the upper lid 2 so as to come into close contact with the seal surface 17 which is the inner surface of the pouring cylinder 11 when the upper lid 2 is closed.

1 . A plastic cap including a cap body fixed to a mouth portion of a container and an upper lid mounted on said cap body so as to be opened and closed, said cap body having a top panel and a skirt falling down from a circumferential edge of the top panel, said top panel having an opening or a predetermined opening area for pouring the liquid in the container, and on an outer side of said opening or the predetermined opening area in the upper surface of said top panel, a pouring protrusion and an annular small protrusion for engagement with the upper lid being formed, said pouring protrusion serving as a guide for pouring the liquid in the container, and said annular small protrusion being positioned on an outer side of said pouring protrusion wherein:
 a bill is formed at an upper end portion of said pouring protrusion, the bill protruding outward in an inclined manner and assuming a triangular shape as viewed from the upper surface thereof;   a lower end portion of an inner surface of said pouring protrusion is a seal surface that extends in a vertical direction;   a groove is formed in the inner surface of said pouring protrusion extending from an upper end portion of said bill up to an upper end portion of said seal surface; and   a seal ring is formed on an inner surface of said upper lid so as to come into close contact with said seal surface when said upper lid is closed.   
   
   
       2 . The plastic cap according to  claim 1 , wherein said pouring protrusion has a cylindrical shape. 
   
   
       3 . The plastic cap according to  claim 1 , wherein the inner surface of said bill of said pouring protrusion is forming an inclined surface that is inclined upward and outward from an upper end of said seal surface, said inclined surface being formed to a height of at least not less than a half that of said pouring protrusion as viewed on a side section at the center of said bill in the circumferential direction. 
   
   
       4 . The plastic cap according to  claim 1 , wherein said opening or the predetermined opening area is formed in a shape in which a portion thereof on a side facing said bill has a pouring liquid-squeezing region of a small width. 
   
   
       5 . The plastic cap according to  claim 1 , wherein said groove includes, as viewed from the upper direction, a large groove portion for guiding a large amount pouring extending from the upper end portion of said seal surface up to the upper end of the bill, and a small groove portion or a intermediate groove portion for guiding a small amount or intermediate amount pouring, the small groove portion or the intermediate groove portion being positioned on an inside of the large groove portion, having a width smaller than that of the large groove portion, and being deeper than the large groove portion, and being extending from the upper end portion of the seal surface up to the upper end of the bill. 
   
   
       6 . The plastic cap according to  claim 5 , wherein on the inside of the large groove portion in said groove, there are formed the intermediate groove portion and the small groove portion, the small groove portion has a width smaller than, and is deeper than, said intermediate groove portion, and is extending from the upper end portion of said seal surface up to the upper end of the bill. 
   
   
       7 . The plastic cap according to  claim 4 , wherein a dented portion that is most dented at the central portion thereof is formed on the inner side of the pouring protrusion of said top panel, said opening or said predetermined opening area is positioned in said dented portion, a pouring passage that is tapered to become narrow toward the end thereof is formed from the pouring liquid-squeezing region in the opening or in the predetermined opening area toward a root portion of said pouring protrusion, and the central portion of said groove is positioned on an extension of the pouring flow passage. 
   
   
       8 . The plastic cap according to  claim 1 , wherein a buffer protrusion is formed protruding outward on the outer surface of said pouring protrusion, and the buffer protrusion is positioned on a lower portion than said bill and on a higher portion than said annular small protrusion for engagement with the upper lid. 
   
   
       9 . The plastic cap according to  claim 8 , wherein said buffer protrusion is positioned near a lower end of the bill, and an outer end of said buffer protrusion in the direction of diameter is located at a position the same as, or slightly on the outer side of, the outer end of the bill in the direction of diameter. 
   
   
       10 . The plastic cap according to  claim 1 , wherein said upper lid is coupled by hinge to the upper end portion of said skirt, and said bill is formed on an opposite side to a portion where said upper lid and the skirt are coupled together by hinge. 
   
   
       11 . The plastic cap according to  claim 10 , wherein the outer end of said bill in the direction of diameter is so protruding as to approach the inner circumferential surface of the lower end of said upper lid but so as not to contact thereto when said upper lid is closed. 
   
   
       12 . The plastic cap according to  claim 10 , wherein a double wall structure comprising an inner wall and an outer wall is formed in at least a portion of said skirt, said inner wall and said outer wall being coupled together at their lower ends through a weakened portion that can be torn apart, and said hinge-coupled portion is formed on said outer wall. 
   
   
       13 . The plastic cap according to  claim 11 , wherein:
 an axial score is formed in said outer wall on the outer side of one end of said hinge-coupling portion and extends in the axial direction so as to be torn apart;   notches are formed at an upper end and at a lower end of said outer wall, respectively, in the portion where said axial score is formed;   at the lower ends of said inner wall and said outer wall, there are formed a tear start region that starts with the lower end of said axial score and extends in the circumferential direction toward the side on where the other end portion of said hinge-coupling portion is positioned and a tear proceed region continuous to said tear start region; and   a strength of coupling the inner wall with the outer wall in said tear start region is set to be relatively smaller than a strength of coupling in said tear proceed region.