Notes

The packing laminate of the type involved right here moreover frequently comprises a base layer of some kind, in particular paper of carton, and in addition linings of thermoplastic materials, which linings on the one hand are meant to guard the finished packages from moisture and wetness, however have the object of making the packing laminate heat-sealable and finally have the item of joining together the fabric layer launched into the laminate. The aspect of the packing laminate which might be turned towards the inside of the finished package is usually lined with a layer of thermoplastic material, e.g., polyethylene, and the material layer following that is usually constituted of a metal foil layer which then in its flip is fastened to a supporting paper layer with the help of an intermediate thermoplastic coat of e.g., polyethylene. Finally, the surface of the packing laminate, that's to say the aspect of the packing laminate which can form the skin of the package, shall be supplied with a thermoplastic coat of e.g., polyethylene, which has as its object the protection of the base layer of paper and the prevention of the absorption of moisture by the mentioned layer. It could also be acceptable in certain cases to heat the metal foil layer to a temperature which appreciably exceeds 100° C., e.g., 150° - 200° C., but to forestall in this case the plastic layer from melting down it could be acceptable to apply a cooling gas, e.g., a chilly air towards the skin of the plastic layer 3. Naturally it's attainable inside the framework of the concept of the invention to rearrange the coils, by the use of which the electromagnetic field is generated, in some other manner than that proven right here, but sensible experiments have instructed that the embodiment described right here is particularly suitable, a minimum of within the remedy of relatively flexible materials webs. It might in fact be acceptable typically to cool the coil windings, that's to say the bars 6 which might readily be done by offering the bars 6 with bores through which a cooling liquid could 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 11. The current invention concerns a technique for the manufacture of laminated packing materials containing no less than one layer of a metal foil, e.g., aluminum foil, and a layer of plastic material applied to the stated metallic foil. The invention also issues an equipment for the belief 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 material, frequently comprise a layer of a metal foil, particularly aluminum foil, which lends the packing laminate very good tightness traits against gases and furthermore provides very efficient gentle safety.
As talked about above, a worse adhesion is obtained between plastic layer and metallic foil layer if the extrusion temperature is low, which suggests that the plastic layer in the finished package might delaminate and thus in precept form a plastic bag inside the package deal which is free from the metallic foil layer. This of course isn't fascinating, however it have to be the item to acquire a non-oxidized inner plastic layer as well as good adhesion between plastic layer and metallic foil, and to find a way to achieve this it was essential to merely accept a compromise between sealability and lamination energy and accordingly the lamination temperature had to be adjusted and maintained very precisely, which may trigger great difficulties. biscuit making machine is characterised further in that the system for the execution of the stated second operational stage consists of one of a number of coils ideally arranged in one plane, which are connectable to a supply of present which may deliver an a.c. In the FIGURE numeral 1 refers to a laminate net the upward turned layer of which consists of a metal foil layer or a metallic foil web. Furthermore a pair of compression rollers cooperating with one another is marked four and a pair of information rollers 5. A excessive frequency current supply is designated 9 and the feed strains from the source of current 9 to the bars 6 are marked eight.
In the coating of plastic onto aluminum foil or other metal foil it has been discovered that the coating can take place by means of a normal extrusion course of which implies the extrusion of a melted plastic mass under high stress via a slender, slotlike opening to form a skinny film which is precipitated onto the metal foil layer, whereupon the metallic foil coated with the plastic materials is launched between compressive rollers, which on the same time have a cooling impact. It is quite attainable in itself to provide by this methodology a relatively good adhesion between the coated plastic layer and the metal foil layer, which, furthermore, may be combined 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 high temperature, that is to say at a temperature which on the extrusion of polyethylene exceeds 300° C. At this comparatively excessive temperature the plastic materials is exposed to a floor oxidation which unfortunately has the result that the plastic layer can now not be heat-sealed as simply as if it had not been oxidized. As it is imperative that the inside layer of the packing laminate must be heat-sealable, since in any other case tight packages cannot be obtained, it is necessary within the coating of the plastic material onto the steel foil layer to make use of an extrusion temperature which is so low that the plastic materials isn't oxidized. Approximately and within the selection of the extrusion temperature a variety of outdoors factors should be taken into consideration, such as e.g., the plastic high quality, the room temperature, the rate of extrusion and so forth.
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