Plastic screw cap with good washability

Abstract

There is provided a plastic screw cap with a tamper-evident band that ensures improved removal of washing water. A plastic screw cap (1) includes: a top plate (3); a skirt wall (5); and a TE band (tamper-evident band) that is connected to a lower end of the skirt wall (5) via a breakable bridge and includes on its inner surface a locking projection (19) capable of being locked to a lower surface of a container jaw portion (53). The TE band (7) includes on its inner surface a flow path forming projection (30) that is located above the locking projection (19) and abuts an outer surface of the container jaw portion (53) to form a flow path between the container jaw portion (53) and an inner surface of the skirt wall (5).

1 . A plastic screw cap including: a top plate; a skirt wall that extends downward from a peripheral edge of the top plate and includes on its inner surface a thread to be screwed to an outer surface of a container mouth portion; and a tamper-evident band that is connected to a lower end of the skirt wall via a breakable bridge and includes on its inner surface a locking projection capable of being locked to a lower surface of a container jaw portion, wherein
 the tamper-evident band further includes on its inner surface a flow path forming projection that is located above the locking projection and abuts an outer surface of the container jaw portion to forma flow path between the container jaw portion and an inner surface of the skirt wall.   
     
     
         2 . The plastic screw cap according to  claim 1 , wherein in a region continuing to an upper surface of the locking projection, an annular inclined surface or a circumferentially intermittent arc-shaped inclined surface is formed such that it becomes gradually thicker from top toward an upper end joint of the locking projection, and
 the flow path forming projection is disposed above the annular inclined surface or the arc-shaped inclined surface.   
     
     
         3 . The plastic screw cap according to  claim 1 , wherein a plurality of the locking projections are formed at regular intervals in a circumferential direction, and
 the flow path forming projection is disposed between and above each pair of adjacent two locking projections.   
     
     
         4 . The plastic screw cap according to  claim 1 , wherein the flow path forming projection has an axially extending rib shape or a block shape.