Induction sealing heat profile improvement

Abstract

A method is provided for bonding a neck to a plastic container. The method includes providing the container with an opening having a first bonding surface, providing the neck with an opening having a second bonding surface, providing a foil seal between the first bonding surface and the second bonding surface, induction sealing at least one of the first and second bonding surfaces to the foil seal by using a magnetic field generated by an induction sealing head, and providing a field influencing object near the foil seal to influence a portion of the magnetic field generated by the induction sealing head.

1 . A method of bonding a neck to a plastic container, comprising: 
 providing the container with an opening having a first bonding surface;    providing the neck with an opening having a second bonding surface;    providing a foil seal between the first bonding surface and the second bonding surface;    induction sealing at least one of the first and second bonding surfaces to the foil seal by using a magnetic field generated by an induction sealing head; and    providing a field influencing object near the foil seal to influence a portion of the magnetic field generated by the induction sealing head.    
     
     
         2 . The method of  claim 1 , wherein the field influencing object is cooled by a cooling device.  
     
     
         3 . The method of  claim 1 , wherein the foil seal is bonded to the second bonding surface before the induction sealing head induction seals the first bonding surface to the foil seal.  
     
     
         4 . The method of  claim 3 , wherein the plastic container is filled with a product before the foil seal is bonded to the second bonding surface.  
     
     
         5 . The method of  claim 4 , wherein a cap is applied to the neck before the foil seal is bonded to the second bonding surface.  
     
     
         6 . The method of  claim 1 , wherein the foil seal is provided with a pull-ring for tearing open the foil seal.  
     
     
         7 . The method of  claim 1 , wherein the field influencing object is a metal object.  
     
     
         8 . The method of  claim 1 , wherein the field influencing object is a magnetizable object.  
     
     
         9 . The method of  claim 1 , wherein the field influencing object absorbs the portion of the magnetic field.  
     
     
         10 . An induction sealing head for bonding a neck to a plastic container, the container having an opening at least partially surrounded by a first bonding surface, the neck having an opening at least partially surrounded by a second bonding surface, the sealing head comprising; 
 a magnetic field generator for generating a magnetic field that is to be absorbed by a foil seal placed between the first bonding surface and the second bonding surface, at least a portion of the energy created by the absorption of the magnetic field by the foil seal causing the foil seal to be bonded to at least one of the first and second bonding surfaces; and    a field influencing object located near the foil seal to influence a portion of the magnetic field generated by the magnetic field generator,    wherein, by influencing the portion of the magnetic field, the field influencing object prevents the portion of the magnetic field from heating the foil seal in a particular area of the foil seal.    
     
     
         11 . The sealing head of  claim 10 , wherein the field influencing object further comprises a cooling device that removes heat from the field influencing object.  
     
     
         12 . The sealing head of  claim 10 , wherein the field influencing object is a metal object.  
     
     
         13 . The sealing head of  claim 10 , wherein the field influencing object is a magnetizable object.  
     
     
         14 . The sealing head of  claim 10 , wherein the field influencing object absorbs the portion of the magnetic field.