Discharge cap

Abstract

The present invention has an object to suppress an external force applied to a container to discharge a content liquid CLq to an appropriate magnitude, to prevent the content liquid CLq discharged from a discharge nozzle 29 from becoming too thick, and to enable the content liquid CLq after discharge to be cut off in an improved manner. A valve part 49 included in a slit valve 7 A includes a slit part 49 b including slits 55 , and an outer circumferential part 49 a coupled to a thin-walled tube part 51 (a connecting part). The slit part 49 b more easily deforms with a pressure change in the interior space of the container than the outer circumferential part 49 a . The slit part 49 b deforms in a discharge direction of the content liquid CLq at the time of discharge of the content liquid CLq, and deforms toward a nozzle flow path 29 a after the content liquid CLq is discharged.

1 . A discharge cap that is attached to a mouth part of a container having an elasticity and that discharges a content liquid associated with a pressure increase in an interior space of the container due to an external force applied to the container, the discharge cap comprising:
 a nozzle that forms a nozzle flow path with a sectional area smaller than an opening area of the mouth part; and   a valve that is provided on the nozzle and that is made of an elastic material softer than the nozzle, wherein   the valve includes a valve part through which the content liquid in the nozzle flow path is discharged, a tubular held part that is held on the nozzle by a holder, and a tubular connecting part that connects the valve part and the held part to each other,   the valve part includes a slit part provided with a slit opening and closing according to a difference between an atmospheric pressure and a pressure in the interior space of the container, and an outer circumferential part coupled to the connecting part, and   the slit part more easily deforms with a pressure change in the interior space than the outer circumferential part, deforms in a discharge direction of the content liquid at a time of discharge of the content liquid, and deforms toward the nozzle flow path after the content liquid is discharged.   
     
     
         2 . The discharge cap according to  claim 1 , wherein the slit part is integrally molded of a same elastic material as that of the outer circumferential part, and is thinner than the outer circumferential part. 
     
     
         3 . The discharge cap according to  claim 2 , wherein
 the valve part includes an intermediate part between the slit part and the outer circumferential part, and   the intermediate part is gradually thinned from the outer circumferential part to the slit part.   
     
     
         4 . The discharge cap according to  claim 3 , wherein the valve part has an outer surface being a spherical concave face depressed toward the nozzle flow path, and an inner surface being a flat face. 
     
     
         5 . The discharge cap according to  claim 1 , wherein
 the slit part has a thickness equal to or less than a half of a thickness of the outer circumferential part, and   the slit part is located on a side nearer the nozzle flow path in relation to an intermediate position of the outer circumferential part in a thickness direction.   
     
     
         6 . The discharge cap according to  claim 1 , wherein the connecting part more easily deforms with a pressure change in the interior space than the outer circumferential part, extends in the discharge direction at a time of discharge of the content liquid, and contracts in a returning direction after the content liquid is discharged. 
     
     
         7 . The discharge cap according to  claim 1 , wherein the connecting part more easily deforms with a pressure change in the interior space than the outer circumferential part, and is inclined in a circumferentially inward direction of the connecting part after the content liquid is discharged.