Method and device for penetrating film-type substrates

Abstract

The invention relates to a device and a method for separating film layers ( 8 ), which consist of different materials and are joined together in an air-thigh manner by adhesion, a material bond or similar forms of bonding, in a simple manner. In this case, separation means that only one respective layer ( 18 ) is pierced and raised by rotation by means of a screw-type thread ( 16 ), allowing a gaseous medium, (e.g. air) or liquid medium, (e.g. water) to be introduced into the gap that has been created between said layer and the second film layer ( 17 ). The method and the device are characterised in that they are simple and can be applied in any position on the film workpieces. No additional openings, distances, valves or similar in the films therefore need to be considered and no prior material treatment, (introduction of separation elements) is required in order to subsequently fill bags that are produced in this manner. Production costs are thus minimised, handling times are reduced and material expenditure or the creation of composites by the introduction of other materials is avoided.

1 . A method for penetrating film-type substrates being arranged air-proofed or tightly one above the other, wherein only a desired number of foil layers is pierced by the defined rotation of a cylindrical hollow body through control of the number of rotations and extent of the torque of at least one cutting surface of the helically terminating portion of the cylindrical hollow body.  
   
   
       2 . The method according to  claim 1 , wherein a gaseous or liquid medium is introduced between the foil layers and through the specially inserted cylindrical hollow body.  
   
   
       3 . A device for penetrating film-type substrates being arranged air-proofed or tightly one above the other, comprising a unilaterally helically designed, cylindrical hollow body, wherein at least one cutting surface of the helically terminating portion of the cylindrical hollow body is designed to gradually pierce a foil or, respectively, by rotation on the same, so as to prevent any penetration into the consecutive foil layer at a defined stop of the rotary movement.  
   
   
       4 . The device according to  claim 3 , wherein an adaptation of the penetration behaviour to different materials and material thicknesses is feasible by the angle of inclination of the cutting surface.  
   
   
       5 . The device according to  claim 3 , wherein the distance of the individual foil layers and relative to each other is determined during separation by the lead of the thread constituting the helical configuration.  
   
   
       6 . The device according to  claim 3 , wherein the degree of adherence of the individual foil layers to the cylindrical hollow body is determinable by determining the dimension of the thread constituting the helical configuration.  
   
   
       7 . The device according to  claim 3 , wherein it is fixedly surrounded by a funnel-shaped part through which the surrounding atmosphere can be sucked in a manner that the foil layers applied on the helically designed, cylindrical hollow body are sucked in by vacuum and thereby placed into a defined and immovable position relative to the cutting surfaces forming the end of the helically designed, cylindrical hollow body.  
   
   
       8 . The device according to  claim 3 , wherein it is connected with a cushioning part located opposite the cutting surfaces forming the end of the helically designed, cylindrical hollow body, in a manner that said cushioning part places the foil layers in a defined and immovable position relative to the cutting surfaces forming the end of the helically designed, cylindrical hollow body.  
   
   
       9 . The device according to  claim 3 , wherein it comprises an internally arranged, second, unilaterally closed hollow cylinder, wherein said second hollow cylinder determines the exit opening for the gaseous or liquid medium between the separated foil layers by changes in position.  
   
   
       10 . The device according to  claim 3 , wherein at least one opening opens near the cutting surface or along the thread being in communication with the interior of the cylindrical hollow body.