Apparatus for sealing containers

Abstract

The invention provides an apparatus for sealing containers which comprises a sealing head 16 for sealing a peripheral edge portion of a lid L to the inner surface of a downwardly tapered body wall B of the container C. The sealing head 16 is provided with a seal holding face 72 fittable to the inner surface of the container body wall B. The seal holding face 72 has an upper region 91 and a lower region 92 . Recesses 93 are formed respectively in a plurality of portions of the lower region 92 along the circumference thereof for absorbing the slack produced in the peripheral edge portion of the lid L at the time of sealing. The apparatus obviates faulty seals in containers and gives an improved aesthetic appearance to the sealed portion.

1 . An apparatus for sealing containers which comprises a sealing head for sealing a peripheral edge portion of a lid to an inner surface of a downwardly tapered body wall of the container, the sealing head being provided with a seal holding face fittable to the body wall inner surface, the apparatus being characterized in that recesses are formed respectively in a plurality of portions of the seal holding face along the circumference thereof for guiding slack produced in the lid peripheral edge portion at the time of sealing.  
     
     
         2 . An apparatus for sealing containers according to  claim 1  wherein the seal holding face has an upper region and a lower region, and the recesses are positioned in the lower region.  
     
     
         3 . An apparatus for sealing containers according to  claim 2  wherein the recesses each have a lower end which is open downward.  
     
     
         4 . An apparatus for sealing containers according to  claim 3  wherein the recesses are each in the form of a groove extending vertically and are arranged at a constant spacing.  
     
     
         5 . An apparatus for sealing containers according to claim wherein the recesses have a width approximately equal the spacing between the adjacent recesses.  
     
     
         6 . An apparatus for sealing containers according to any one of  claims 1  to  5  which comprises a holder for holding the container and wherein the holder has a container inserting bore, and an inner peripheral surface of the holder defining the bore has an upper end portion providing a seal bearing face corresponding to the seal holding face, the seal bearing face having a diameter constant over the entire length thereof and equal to the outside diameter of an upper end of the container body wall.