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Finally a second pair of compression rollers is designated 10 and a journal curler for the completed packing material is designated 11. The current invention considerations a technique for the manufacture of laminated packing materials containing a minimal of one layer of a metallic foil, e.g., aluminum foil, and a layer of plastic material utilized to the said steel foil. The invention additionally issues an equipment for the conclusion of the method for the manufacture of laminated packing materials. Modern packages, which are manufactured from a web of packing laminate or from sheet of laminated material, regularly comprise a layer of a metallic foil, particularly aluminum foil, which lends the packing laminate excellent tightness traits towards gases and moreover provides very efficient mild protection.
The packing laminate of the sort involved right here moreover incessantly contains a base layer of some kind, particularly paper of carton, and likewise linings of thermoplastic materials, which linings on the one hand are meant to guard the completed packages from moisture and wetness, then again have the thing of creating the packing laminate heat-sealable and at last have the item of becoming a member of together the fabric layer introduced into the laminate. The aspect of the packing laminate which might be turned towards the inside of the completed package is mostly lined with a layer of thermoplastic material, e.g., polyethylene, and the fabric layer following that is usually constituted of a metallic foil layer which then in its turn is fastened to a supporting paper layer with the assistance of an intermediate thermoplastic coat of e.g., polyethylene. Finally, the outside of the packing laminate, that's to say the aspect of the packing laminate which is ready to kind the surface of the package, shall be provided with a thermoplastic coat of e.g., polyethylene, which has as its object the protection of the bottom layer of paper and the prevention of the absorption of moisture by the said layer. It could additionally be appropriate in certain cases to warmth the metal foil layer to a temperature which appreciably exceeds 100° C., e.g., 150° - 200° C., however to prevent on this case the plastic layer from melting down it could be appropriate to use a cooling gas, e.g., a cold air towards the skin of the plastic layer 3. Naturally it is attainable inside the framework of the idea of the invention to rearrange the coils, via which the electromagnetic area is generated, in another manner than that proven here, but sensible experiments have suggested that the embodiment described here is very suitable, no much less than in the therapy of relatively flexible materials webs. It might after all be appropriate sometimes to cool the coil windings, that's to say the bars 6 which might readily be done by offering the bars 6 with bores by way of which a cooling liquid may be made to flow into.
In the coating of plastic onto aluminum foil or different metallic foil it has been found that the coating can happen via a standard extrusion course of which implies the extrusion of a melted plastic mass underneath high stress by way of a slender, slotlike opening to form a skinny movie which is precipitated onto the metallic foil layer, whereupon the steel foil coated with the plastic material is launched between compressive rollers, which on the identical time have a cooling effect. It is kind of potential in itself to produce by this technique a relatively good adhesion between the coated plastic layer and the metal foil layer, which, furthermore, may be mixed in advance with the said base paper layer, but in such a case the extrusion of plastic materials must be carried out at a very excessive temperature, that's to say at a temperature which at the extrusion of polyethylene exceeds 300° C. At this comparatively excessive temperature the plastic materials is uncovered to a floor oxidation which sadly has the end result that the plastic layer can no longer be heat-sealed as simply as if it had not been oxidized. As it's imperative that the inside layer of the packing laminate should be heat-sealable, since in any other case tight packages cannot be obtained, it is essential in the coating of the plastic materials onto the metal foil layer to use an extrusion temperature which is so low that the plastic material is not oxidized. Approximately and within the alternative of the extrusion temperature numerous outside elements have to be taken into consideration, similar to e.g., the plastic quality, the room temperature, the speed of extrusion and so on.
As talked about above, a worse adhesion is obtained between plastic layer and steel foil layer if the extrusion temperature is low, which suggests that the plastic layer within the completed bundle may delaminate and thus in precept form a plastic bag inside the package deal which is free from the metal foil layer. Snack food extruder machine after all isn't fascinating, however it have to be the item to obtain a non-oxidized inside plastic layer in addition to good adhesion between plastic layer and metallic foil, and in order to achieve this it was needed to accept a compromise between sealability and lamination strength and accordingly the lamination temperature needed to be adjusted and maintained very accurately, which may trigger great difficulties. The invention is characterized further in that the system for the execution of the said second operational stage consists of considered one of a quantity of coils ideally organized in one aircraft, that are connectable to a supply of present which can ship an a.c. In the FIGURE numeral 1 refers to a laminate web the upward turned layer of which consists of a metallic foil layer or a metal foil internet. Furthermore a pair of compression rollers cooperating with each other is marked 4 and a pair of guide rollers 5. A excessive frequency current supply is designated 9 and the feed traces from the supply of current 9 to the bars 6 are marked eight.
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