Heating plate with a multiplicity of heating cartridges

Abstract

The present invention relates to a packaging machine with a forming station, which forms depressions in a sheet of film, wherein a heating element heats the sheet of film before the deforming, in which the heating element has a multiplicity of discrete heating means which can be activated individually or in groups, and so the sheet of film has temperature gradients.

1 . A packaging machine having a forming station which forms cavities in a film web, a heating element heating the film web before the formation of the cavities, characterized in that the heating element has a multiplicity of discrete heating means which can be actuated individually or in groups, with the result that the film web has temperature gradients. 
   
   
       2 . The packaging machine preferably as claimed in patent  claim 1 , characterized in that it has a sealing mold, by way of which an upper film can be sealed to the packaging cavity, the sealing mold having a heating element to heat it, characterized in that the sealing mold heating element has a multiplicity of discrete heating means which can be actuated individually or in groups. 
   
   
       3 . The packaging machine as claimed in  claim 1 , characterized in that the heating means can be operated with a different voltage. 
   
   
       4 . The packaging machine as claimed in  claim 1 , characterized in that the heating element has at least one temperature sensor, the signal of which serves for controlling one or more heating means. 
   
   
       5 . The packaging machine as claimed in  claim 1 , characterized in that it has means for improving the thermal exchange between the film web and the heating element. 
   
   
       6 . The packaging machine as claimed in  claim 2 , characterized in that the heating element of one or both of the forming station or the sealing mold has means for local cooling. 
   
   
       7 . The packaging machine as claimed in  claim 1  characterized in that the heating element means are controlled so that sections of the film web are heated to different temperatures prior to drawing to control flow of the film web in selected locations during drawing. 
   
   
       8 . The packaging machine as claimed in  claim 2  characterized in that either or both of the heating element or the sealing mold heating element are controlled so that sections of the film web are heated to different temperatures prior to drawing to control flow of the film web in selected locations during drawing. 
   
   
       9 . The packaging machine as claimed in  claim 2  characterized in that the machine includes a sealing station at which the sealing mold is located, which is operationally downstream from the forming station. 
   
   
       10 . The packaging machine as claimed in  claim 8  characterized in that the machine includes a sealing station at which the sealing mold is located, which is operationally downstream from the forming station. 
   
   
       11 . The packaging machine as claimed in  claim 1  characterized in that the machine includes a sealing station at which a sealing mold is located, which is operationally downstream from the forming station. 
   
   
       12 . The packaging machine as claimed in  claim 9  characterized in that the machine operates to deep draw an underfilm that unrolls from a reel at the forming station, to form a plurality of cavities that receive material to be packaged, and to seal the cavities having the material therein, with an upper film at the sealing station. 
   
   
       13 . The packaging machine as claimed in  claim 10  characterized in that the machine operates to deep draw an underfilm that unrolls from a reel at the forming station, to form a plurality of cavities that receive material to be packaged, and to seal the cavities having the material therein, with an upper film at the sealing station. 
   
   
       14 . The packaging machine as claimed in  claim 11  characterized in that the machine operates to deep draw an underfilm that unrolls from a reel at the forming station, to form a plurality of cavities that receive material to be packaged, and to seal the cavities having the material therein, with an upper film at the sealing station. 
   
   
       15 . The packaging machine as claimed in  claim 11 , characterized in that the heating element of one or both of the forming station or the sealing mold has means for local cooling. 
   
   
       16 . The packaging machine as claimed in  claim 12 , characterized in that the heating element of one or both of the forming station or the sealing mold has means for local cooling. 
   
   
       17 . The packaging machine as claimed in  claim 13 , characterized in that the heating element of one or both of the forming station or the sealing mold has means for local cooling. 
   
   
       18 . The packaging machine as claimed in  claim 4  characterized in that the heating means are controlled so that sections of the film web are heated to different temperatures prior to drawing to control flow of the film web in selected locations during drawing. 
   
   
       19 . The packaging machine as claimed in  claim 18  characterized in that the machine includes a sealing station at which the sealing mold is located, which is operationally downstream from the forming station. 
   
   
       20 . The packaging machine as claimed in  claim 18  characterized in that the machine operates to deep draw an underfilm that unrolls from a reel at the forming station, to form a plurality of cavities that receive material to be packaged, and to seal the cavities having the material therein, with an upper film at a downstream sealing station.