Method and device for manufacturing tear-open lids

Abstract

During the manufacturing of tear-open lids out of lid rings with a tear-open foil sealed on it, the tear-open foil having a tear-open tab, the tear-open tab is fixed by means of an adhesive surface which is applied onto the tape before stamping out the tear-open foil out of a band of this material.

1 . A method for manufacturing tear-open lids, comprising the steps of:
 feeding in a band of tear-open foil material;   stamping a foil section with a tear-open tab out of the band;   sealing the foil section onto a lid ring; and   folding back the tear-open tab onto the lid, characterized by the step of:   applying an adhesive surface on the band before stamping out the foil section, at a position where the folded back tear-open tab comes to lie on the tear-open lid.   
   
   
       2 . The method according to  claim 1 , wherein the adhesive surface is applied as a piece of a double sided adhesive tape. 
   
   
       3 . The method according to  claim 2 , wherein an adhesive tape is applied, which has different adhesive strengths on each of its sides, wherein the adhesive strength on the side facing the tear-open tab is smaller. 
   
   
       4 . The method according to  claim 2 , wherein the piece above the band is stamped out of the adhesive tape and applied on the band directly after that. 
   
   
       5 . The method according to  claim 2 , wherein the adhesive tape has a protective foil on its upper side, which is removed before folding back the tear-open tab. 
   
   
       6 . The method according to  claim 5 , wherein the protective foil is loosened by means of at least an air jet and the loosened protective foil is sucked off by means of a suction flow. 
   
   
       7 . The method according to  claim 1 , wherein the adhesive surface is applied in liquid form. 
   
   
       8 . The method according to  claim 7 , wherein a sealing paint is applied as adhesive surface and wherein a sealing for the fixing of the tab takes place while folding the tab back onto the lid. 
   
   
       9 . The method according to  claim 8 , wherein the sealing paint is applied as adhesive surface by printing. 
   
   
       10 . The method according to  claim 8 , wherein the sealing paint is applied as adhesive surface by spraying. 
   
   
       11 . A device for manufacturing tear-open lids, comprising
 a conveying installation for lid parts and lids,   a sealing station wherein a band of tear-open foil material is feedable by means of feeding means wherein the sealing station is formed to stamp out a foil section with a tear-open tab out of the band and to seal the foil section with its sealable lower side onto a lid ring,   a folding station wherein the tear-open tab is foldable onto the lid,   characterized in that an installation is provided, by means of which an adhesive surface is applicable on the upper side of the band before stamping out the foil section.   
   
   
       12 . The device according to  claim 11 , wherein the installation has at least a feeder for at least an adhesive tape as well as at least a stamping tool by which the adhesive surface is stampable out of the adhesive tape and applicable on the upper side of the band. 
   
   
       13 . The device according to  claim 11 , wherein an equipment for removing a protective foil from the adhesive surface is provided. 
   
   
       14 . The device according to  claim 13 , wherein the equipment is formed to apply pressurized air to the adhesive surface and to suck off the loosened protective foil. 
   
   
       15 . A tear-open lid with a lid ring and a tear-open foil with a folded back tear-open tab, characterized in that the tear-open tab is attached on the tear-open foil by means of an adhesive surface which is formed from a piece of double sided adhesive tape whose adhesive strength is different on each of its sides, wherein the lower adhesive strength acts on the side to which the tear-open tab is attached.