Notes

Finally a second pair of compression rollers is designated 10 and a magazine curler for the finished packing materials is designated 11. The present invention considerations a technique for the manufacture of laminated packing material containing no much less than one layer of a steel foil, e.g., aluminum foil, and a layer of plastic materials utilized to the stated steel foil. The invention also issues an equipment for the conclusion of the strategy for the manufacture of laminated packing materials. Modern packages, which are manufactured from an online of packing laminate or from sheet of laminated materials, frequently comprise a layer of a metallic foil, particularly aluminum foil, which lends the packing laminate excellent tightness characteristics towards gases and moreover offers very effective gentle protection.
As mentioned above, a worse adhesion is obtained between plastic layer and steel foil layer if the extrusion temperature is low, which means that the plastic layer in the finished bundle might delaminate and thus in precept form a plastic bag contained in the package deal which is free from the metallic foil layer. This after all is not desirable, however it must be the object to acquire a non-oxidized inner plastic layer as well as good adhesion between plastic layer and metal foil, and so as to obtain this it was needed to simply accept a compromise between sealability and lamination power and accordingly the lamination temperature had to be adjusted and maintained very precisely, which can cause great difficulties. The invention is characterized further in that the device for the execution of the stated second operational stage consists of certainly one of a quantity of coils ideally organized in a single plane, which are connectable to a supply of present which might deliver an a.c. In the FIGURE numeral 1 refers to a laminate internet the upward turned layer of which consists of a metal foil layer or a steel foil net. Furthermore a pair of compression rollers cooperating with each other is marked four and a pair of guide rollers 5. A high frequency current supply is designated 9 and the feed traces from the source of present 9 to the bars 6 are marked eight.
In the coating of plastic onto aluminum foil or different metal foil it has been found that the coating can happen via a traditional extrusion course of which implies the extrusion of a melted plastic mass underneath excessive pressure through a slender, slotlike opening to kind a thin movie which is precipitated onto the steel foil layer, whereupon the steel foil coated with the plastic material is introduced between compressive rollers, which on the same time have a cooling impact. It is kind of possible in itself to produce by this technique a relatively good adhesion between the coated plastic layer and the steel foil layer, which, furthermore, may be combined upfront with the said base paper layer, but in such a case the extrusion of plastic materials has to 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 relatively high temperature the plastic materials is uncovered to a surface oxidation which sadly has the result that the plastic layer can not be heat-sealed as easily as if it had not been oxidized. As it's crucial that the within layer of the packing laminate must be heat-sealable, since in any other case tight packages can't be obtained, it is essential within the coating of the plastic material onto the metal foil layer to use an extrusion temperature which is so low that the plastic material is not oxidized. Approximately and in the choice of the extrusion temperature numerous outside elements should be taken under consideration, similar to e.g., the plastic high quality, the room temperature, the speed of extrusion and so forth.
The packing laminate of the type concerned right here furthermore regularly contains a base layer of some sort, particularly paper of carton, and also linings of thermoplastic materials, which linings on the one hand are meant to guard the finished packages from moisture and wetness, then again have the object of creating the packing laminate heat-sealable and at last have the item of becoming a member of together the material layer introduced into the laminate. The aspect of the packing laminate which will be turned toward the within of the completed package deal is generally lined with a layer of thermoplastic materials, e.g., polyethylene, and the material layer following that is usually constituted of a metal foil layer which then in its turn is mounted to a supporting paper layer with the assistance of an intermediate thermoplastic coat of e.g., polyethylene. Finally, the surface of the packing laminate, that is to say the aspect of the packing laminate which will kind the surface of the package, might be supplied 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 mentioned layer. It may be acceptable in certain instances to heat the metal foil layer to a temperature which appreciably exceeds 100° C., e.g., 150° - 200° C., but to prevent on this case the plastic layer from melting down it could be appropriate to use a cooling gas, e.g., a chilly air against the outside of the plastic layer 3. Naturally automatic biscuit production line within the framework of the concept of the invention to rearrange the coils, by means of which the electromagnetic subject is generated, in some other method than that shown right here, but sensible experiments have instructed that the embodiment described here is very suitable, no less than within the therapy of relatively flexible materials webs. It might in fact be appropriate generally to cool the coil windings, that's to say the bars 6 which can readily be carried out by providing the bars 6 with bores through which a cooling liquid may be made to circulate.
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