DE7218681U - DOCUMENT AND BANKNOTE PAPER WITH SECURITY STRIPES - Google Patents

Description

/ Document and banknote paper with security is ripe \

The present innovation is a document and banknote paper with security strips, which is characterized by this is that the security strip is made of a hollow fiber closed at the end of transparent Plastic according to utility model 72 ο9 753 is made, which contains a filling that depends on the temperature changes from colorless or from a certain color to one or another color or one after the other to passes over several colors.

The hollow fiber forming the security strip is preferably flat and has a rectangular shape Cross section on; the filling preferably has a reversible, temperature-dependent color effect.

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The new security strip enables it to be on proportionately simply by means of any heat or cold source, e.g. by rubbing with your fingers, forgeries of banknotes and the like can be quickly and reliably recognized visually when a very specific filling of the hollow fiber used as a security strip has been selected.

It is extremely difficult for a forger to obtain such a security strip, which can be determined in the case of an optionally Temperature shows a certain reversible color change to mimic. The piece of hollow fiber forming the security strip can expediently have two or more chambers, each with different fillings are provided, which show a very specific reversible color change at different temperatures.

As a filling for the hollow fibers used as security strips cholesterol liquid crystals are preferably used, in particular, which have a reversible color effect have, depending on the temperature, optionally together with additives of customary dyes and / or Pigments. Such liquid crystals are well known to those skilled in the art. In particular, the filling shows a color change in the temperature range from about -50 to about +250 C.

The transparent hollow fiber made of plastic preferably has individual, separated from one another by welded connections Chambers, which preferably-optionally only partially, a filling of at least one liquid crystal, optionally in the form of a paste and / or together with other substances, such as egg. Pigments, containing the filling of the

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individual chambers in terms of color and / or composition can be the same or different.

The filling preferably shows reversible color behavior, i.e. it occurs when the temperature is increased or decreased the originally colorless or colored state.

To increase security you can use a security strip Hollow fibers with a filling of a mixture of e.g. two or more different liquid crystals - if necessary in an intimate mixture with customary dyes compatible with the liquid crystals and / or Pigments - use which show a reversible color change at different temperatures, whereby with a suitable choice of the liquid crystals in a certain temperature range a twofold color change below Formation of mixed or addition colors can occur.

The inventive security strip is based on the drawings, the schematically exemplary embodiments represent, explained in more detail.

Fig. 1 shows a schematic cross section of a rectangular hollow fiber made of colorless transein and used as a security strip
Parent or transparent / colored plastic (2) with the inner opening (1), in which the filling of, for example, at least one liquid crystal, optionally in the form of a paste and optionally together with an addition of customary, with the liquid crystal ( en) and the plastic compatible dyes and / or pigments is located;

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Fig. 2 shows a section along the lines AB of Fig. 1 perpendicular to the plane of the paper; one can see the inner openings (1) of the security strip in which the filling is located and which are divided into individual chambers, which in the present case are of different sizes, divided by welded connections (3).

The manufacturing process used as a security strip The filled hollow fiber used differs from known processes for the production of e.g. tubes very small diameter, which is very small in the medical field or when sheathing wire strands Diameter are used, in that during the formation of the hollow fiber by extrusion in a known manner by means of a ring nozzle with a very small opening diameter an inner nozzle under the application of pressure, the hollow fibers formed are filled with the filling.

In the manufacture of the hollow fiber by extrusion at a Depending on the material temperature, e.g. at 160 ° C, the extruder nozzle is cooled in a known manner, e.g. from the outside by a coolant such as cooling water, which at the same time acts as a sliding layer between the surface of the hose and the outer wall of the extruder nozzle is used. The extruder nozzle can also be cooled from the inside in a known manner, by passing coolant through channels and the like installed in it.

If - which depends on the special substances used as filling and their temperature resistance - one Cooling of the filling nozzle, which is arranged inside the hollow fiber that is being formed, is required, the filling

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nozzle can be provided with a cooling system and cooled. Instead of this or in addition, however, the substance to be introduced as a filling, which is advantageously present in pasty form, can itself be cooled ^{to the necessary temperature, for example +1 ° C.}

The area of the forming, still plastic tube, in which the filling is introduced, has an essential feature larger diameter than the extruder nozzle, which determines the final diameter of the hollow fiber. This larger area is necessary, since the inner nozzle cannot be made arbitrarily small, but on the other hand there must also be sufficient space for the continuous transport and constant cooling of the filler substance got to. The wall of the inner filling nozzle is also dimensioned so that it is used for transporting the filling substance withstands the necessary pressure.

The fiber tube provided with the filling and leaving the extruder nozzle is further cooled in a known manner, e.g. passed through a water bath. With a synchronously switched welding stamp, e.g. thermally, the filled hollow fiber divided into individual segments (chambers) of any size. This subdivision into individual segments is necessary in order to achieve a To prevent leakage of the filling substance, e.g. the liquid crystals, when the hose is in the course of processing should be trimmed to any length.

The capillary effect usually has a favorable effect here because the filling is on the inner surface of the hollow

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fiber evenly distributed, so that perfect filled hollow fibers are obtained, even if the volume of the introduced Filling is smaller than the internal volume of the hollow fiber.

The radial arrangement of the molecules of the liquid crystals in the capillaries adjusts the orientation and This optimizes the properties inherent in liquid crystals, such as particularly high color brilliance.

The hollow fiber serving as a security strip can, like the previously known security strips, be inserted into the document or Banknote paper can be incorporated in a known manner during its production.

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Claims (1)

OR.JUR. θ (Ρΐ, _εί ! Ε _Μ .ϊ? Μ ^ _Βη , August 29, 1972 ALFRED Df? j "i Re: utility model application G 72 18 681. Hermann M. Timm - our no. 17 903 - Claim to protection; Document and banknote paper with security stripes, characterized in that the security stripe consists of a filled hollow fiber made of transparent plastic according to utility model G 72 09 758. For β Hermann M. / Timm (Dr. H.J. ^ Wolff) Lawyer 721868130.11.72 ,,