Notes

In the coating of plastic onto aluminum foil or different steel foil it has been discovered that the coating can happen via a normal extrusion course of which implies the extrusion of a melted plastic mass beneath high strain through a slim, slotlike opening to kind a thin film which is precipitated onto the metallic foil layer, whereupon the steel foil coated with the plastic materials is introduced between compressive rollers, which at the same time have a cooling impact. It is kind of possible in itself to provide by this technique a comparatively good adhesion between the coated plastic layer and the metal foil layer, which, furthermore, may be combined upfront with the mentioned base paper layer, but in such a case the extrusion of plastic material has to be carried out at a really excessive temperature, that is to say at a temperature which on the extrusion of polyethylene exceeds 300° C. At this relatively excessive temperature the plastic material is uncovered to a floor oxidation which unfortunately has the end result that the plastic layer can now not be heat-sealed as easily as if it had not been oxidized. As Snack food extruder machine is crucial that the inside layer of the packing laminate must be heat-sealable, since otherwise tight packages can't be obtained, it is needed 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 just isn't oxidized. Approximately and within the choice of the extrusion temperature numerous outside elements should be taken into account, similar to e.g., the plastic high quality, the room temperature, the rate of extrusion and so forth.
As mentioned above, a worse adhesion is obtained between plastic layer and metallic foil layer if the extrusion temperature is low, which implies that the plastic layer within the completed bundle could delaminate and thus in precept form a plastic bag inside the bundle which is free from the metal foil layer. This in fact is not fascinating, however it should be the thing to acquire a non-oxidized inner plastic layer as properly as good adhesion between plastic layer and metal foil, and so as to obtain this it was essential to accept a compromise between sealability and lamination power and accordingly the lamination temperature had to be adjusted and maintained very accurately, which may cause nice difficulties. The invention is characterised additional in that the gadget for the execution of the said second operational stage consists of certainly one of several coils ideally arranged in one airplane, that are connectable to a source of current which can ship an a.c. In automatic biscuit production line refers to a laminate web the upward turned layer of which consists of a metal foil layer or a metallic foil internet. Furthermore a pair of compression rollers cooperating with each other is marked 4 and a pair of information rollers 5. A high frequency current source is designated 9 and the feed lines from the source of current 9 to the bars 6 are marked 8.
The packing laminate of the kind involved here furthermore regularly comprises a base layer of some type, specifically paper of carton, and in addition linings of thermoplastic materials, which linings on the one hand are meant to protect the completed packages from moisture and wetness, then again have the item of creating the packing laminate heat-sealable and finally have the thing of becoming a member of together the fabric layer launched into the laminate. The facet of the packing laminate which will be turned towards the inside of the completed package deal is generally covered with a layer of thermoplastic materials, e.g., polyethylene, and the material layer following that is often constituted of a metallic foil layer which then in its flip is mounted to a supporting paper layer with the help of an intermediate thermoplastic coat of e.g., polyethylene. Finally, Snack food extruder machine of the packing laminate, that's to say the facet of the packing laminate which will kind the surface of the package deal, shall 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 stated layer. It may be acceptable in sure circumstances to warmth the steel 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 might be appropriate to apply a cooling fuel, e.g., a cold air in opposition to the outside of the plastic layer three. Naturally it's potential throughout the framework of the concept of the invention to arrange the coils, via which the electromagnetic subject is generated, in some other method than that proven right here, however sensible experiments have advised that the embodiment described right here is very suitable, no much less than in the remedy of comparatively flexible material webs. It might after all be applicable typically to cool the coil windings, that is to say the bars 6 which might readily be carried out by providing the bars 6 with bores by way of which a cooling liquid could be made to circulate.
Finally a second pair of compression rollers is designated 10 and a journal curler for the finished packing material is designated eleven. The present invention considerations a technique for the manufacture of laminated packing materials containing no much less than one layer of a metal foil, e.g., aluminum foil, and a layer of plastic materials utilized to the said metal foil. The invention also considerations an equipment for the realization of the strategy for the manufacture of laminated packing material. Modern packages, that are manufactured from an internet of packing laminate or from sheet of laminated materials, incessantly comprise a layer of a steel foil, particularly aluminum foil, which lends the packing laminate superb tightness traits against gases and moreover provides very efficient mild protection.
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