Spout for pouch and plastic pouch with spout fixed thereto

Abstract

The invention provides a spout for a pouch, which can be reliably heat-sealed with a plastic pouch body to provide an excellent gas-shielding capability for preventing gas permeation through the spout itself, and can be simply manufactured at a low cost without requiring complicated processes and special materials. In a spout for a pouch, comprising a tubular mouth part having a cap fitting portion and a seal part connected to a lower end portion of the mouth part for sealing with the pouch, the invention is featured in that a horizontal cross-sectional shape of the seal part is different in a height direction between an upper end portion and a lower end portion thereof, and an outer peripheral length of the horizontal cross-sectional shape is substantially equal at any position between the upper end portion and the lower end portion of the seal part.

1 . A spout for a pouch, comprising a tubular mouth part having a cap fitting portion and a seal part connected to a lower end portion of the mouth part for sealing with the pouch, wherein a horizontal cross-sectional shape of the seal part is different in a height direction between an upper end portion and a lower end portion thereof, and an outer peripheral length of the horizontal cross-sectional shape is substantially equal at any position between the upper end portion and the lower end portion of the seal part.  
   
   
       2 . A spout for a pouch according to  claim 1 , wherein an area surrounded by a contour of the horizontal cross-section of the seal part continuously increases in a direction toward the lower end portion from the upper end portion of the seal part.  
   
   
       3 . A spout for a pouch according to  claim 1 , wherein a horizontal cross-sectional shape of the seal part is circular or elliptic in the upper end portion thereof and is boat-like symmetrical in the left and right direction in the lower end portion thereof.  
   
   
       4 . A spout for a pouch according to  claim 1 , wherein wing pieces each having a thickness increasing in a direction toward the lower end portion from the upper end portion thereof are symmetrically provided on opposite sides of the seal part.  
   
   
       5 . A spout for a pouch according to  claim 1 , wherein outer-peripheral lower end portions of the seal part are rounded.  
   
   
       6 . A spout for a pouch according to  claim 1 , wherein a tongue-shaped projection is provided at a lower end portion of the seal part.  
   
   
       7 . A spout for a pouch according to  claim 1 , wherein a gas barrier layer is provided at least in the tubular mouth part of the spout.  
   
   
       8 . A spout for a pouch according to  claim 1 , wherein a bar-like member is provided to extend downward from the seal part.  
   
   
       9 . A spout for a pouch according to  claim 1 , wherein a rib is provided on the seal part.  
   
   
       10 . A spout for a pouch according to  claim 1 , wherein a cap equipped with a heat sealable lid is fitted to the mouth part of the spout, the cap having means to peel off the heat sealed lid from the mouth part of the spout when the cap is opened.  
   
   
       11 . A spout having an opening portion, wherein a spout for a pouch according to  claim 1  is fixed to the opening portion of the pouch by heat sealing.  
   
   
       12 . A pouch with a spout according to  claim 11 , wherein the spout is fixed to the opening portion of the pouch such that the upper end portion of the heat-sealed part of the spout is arranged inward of the pouch from the upper end portion of the pouch body.