Notes

The packing laminate of the kind involved right here furthermore incessantly contains a base layer of some sort, particularly paper of carton, and also linings of thermoplastic materials, which linings on the one hand are intended to guard the completed packages from moisture and wetness, however have the object of constructing the packing laminate heat-sealable and eventually have the item of becoming a member of collectively the fabric layer introduced into the laminate. The facet of the packing laminate which might be turned toward the inside of the finished bundle is usually 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 flip is fastened 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 is able to form the skin of the package deal, might be supplied with a thermoplastic coat of e.g., polyethylene, which has as its object the safety of the bottom layer of paper and the prevention of the absorption of moisture by the stated layer. biscuit production machine may be applicable in certain circumstances to heat the steel foil layer to a temperature which appreciably exceeds 100° C., e.g., 150° - 200° C., however to stop on this case the plastic layer from melting down it might be acceptable to apply a cooling gasoline, e.g., a cold air against the surface of the plastic layer three. Naturally it's attainable within the framework of the idea of the invention to arrange the coils, by the use of which the electromagnetic field is generated, in another manner than that proven right here, but sensible experiments have advised that the embodiment described here is especially suitable, at least in the treatment of relatively flexible materials webs. It could of course be acceptable generally to cool the coil windings, that's to say the bars 6 which might readily be carried out by offering the bars 6 with bores by way of which a cooling liquid may be made to flow into.
Finally a second pair of compression rollers is designated 10 and a magazine roller for the completed packing materials is designated eleven. The present invention considerations a way for the manufacture of laminated packing material containing a minimal of one layer of a steel foil, e.g., aluminum foil, and a layer of plastic material applied to the mentioned steel foil. The invention additionally concerns an equipment for the realization of the strategy for the manufacture of laminated packing materials. Modern packages, which are manufactured from a web of packing laminate or from sheet of laminated material, frequently comprise a layer of a steel foil, in particular aluminum foil, which lends the packing laminate excellent tightness characteristics towards gases and moreover gives very effective gentle safety.
In the coating of plastic onto aluminum foil or different metal foil it has been found that the coating can take place by the use of a standard extrusion process which suggests the extrusion of a melted plastic mass underneath high pressure via a slender, slotlike opening to type a thin movie which is precipitated onto the metallic foil layer, whereupon the metal foil coated with the plastic material is introduced between compressive rollers, which on the same time have a cooling impact. It is quite possible in itself to supply by this technique a relatively good adhesion between the coated plastic layer and the steel foil layer, which, moreover, can be mixed in advance with the mentioned base paper layer, but in such a case the extrusion of plastic material needs 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 comparatively excessive temperature the plastic material is uncovered to a floor oxidation which sadly has the result that the plastic layer can now not be heat-sealed as simply as if it had not been oxidized. As it's imperative that the within layer of the packing laminate must be heat-sealable, since in any other case tight packages cannot be obtained, it is essential in 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 alternative of the extrusion temperature a selection of exterior factors need to be taken under consideration, similar to e.g., the plastic quality, the room temperature, the speed of extrusion and so forth.
As talked about above, a worse adhesion is obtained between plastic layer and metal foil layer if the extrusion temperature is low, which suggests that the plastic layer in the finished package might delaminate and thus in principle kind a plastic bag inside the bundle which is free from the steel foil layer. This in fact is not fascinating, however it must be the object to obtain a non-oxidized inner plastic layer as properly as good adhesion between plastic layer and steel foil, and to be able to obtain this it was needed to merely accept a compromise between sealability and lamination energy and accordingly the lamination temperature had 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 mentioned second operational stage consists of considered one of a number of coils preferably arranged in a single airplane, which are connectable to a supply of current 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 steel foil layer or a metal foil web. Furthermore a pair of compression rollers cooperating with each other is marked 4 and a pair of information rollers 5. A high frequency present source is designated 9 and the feed strains from the source of present 9 to the bars 6 are marked eight.
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