DE2156888A1 - Process for the production of security paper - Google Patents

Description

Blank page

lh ^J 'r Ί I

Λ \

MlC. IXG. K. W (JKST Il O ^Kl;; IHtiICv IMiCIlM ΛΧΧ I.) H. IXC. l>. ItKIlKKNN

'inrii. ixe. κ. (.'οκτκ ; j> atj: n't \ .vu'Ai.ti;

s Wed; N (Ui KX »n Sf! 11 «'KIIlKlIKTKAhKC -J τί: ϊ.Κΐ '<»ί (OSl 1)« I! 'J (I ~> J τ Ι.Ι.Κ1 B «4 070 τ>: ι.ι: οιιλλιμι: j

M ( ^% xcjti:. \

1A- 40

description

z \ x the

Harold Malcolm CfOltOOiM / XlLIAMS, ϊίeld Cottage, Cottage lane, Sedlescoinbe, Hear Bottle, Sussex,

England

"concerning

Process for the production of security paper

"'* ~ i> he Erf Inciting concerns" a method zürlHersteiiurig of' security - - licitcpapier, that is, the subject of a paper that serves as a carrier for printed V / crtzeichen by its very existence at risk of unauthorized imitation!. As the main-

"The area of application for such papers is the production of _r - J banknotes, but also vc-u pahx notes, alctien and the like r /. JLn question.

¹ lim to be able to identify forgeries, the real paper should be provided with one or more characteristic features,

209822/0660

which are easily identifiable, for example, by a bank treasurer, but which cannot be copied without great difficulty · AI3 security papers used paper material -, is generally watermarked ,. however can "Such watermarks by; skillful forgers, so good 'iwitio- ;, That they escape detection if only aiceiser check is carried out. Another problem with banknote paper is the occasional splitting of the paper into layers, do that, for example, two halves are produced which, under certain circumstances, may be used separately after suitable aftertreatment. 1!?; is also known for banknote paper to store metal strips, but such strips are expensive and tend to encourage leafing through or delamination of the pai ^ .oi '.. «, since they can easily act as a separating core works.

The invention is based on the task of creating a security paper to create that is not much more difficult to imitate and harder to take apart by peeling open in layers. leaves as previously known papers of this type. Object of the invention it is furthermore one for the production of such a security paper indicate suitable and advantageous method.

In a method for producing security paper with non-cellulosic material embedded in the paper, the invention consists in that a thermoplastic material is used as the non-cellulosic material and that the temperature is _:. the production is increased so much * that the material melts.

The material that melts during manufacture mixes the adjacent fibers, that is to say these surrounding fibers impregnated so that the material no longer looks from the paper lets separate. A peeling open in layers is thus pralrfciach not possible. The presence of the. · Thermoplastic material can also be adjusted depending on the specific properties of the Hateriales and the mass of paper under continuous light determine by direct monitoring or by sensing or palpation./

The invention also exists with a security paper

209822/0660

2155888

embedded in the paper non-zelluloscm material is that the I-Iaterial an in situ a molten locally _s is mixed with the thermoplastic material Easermaterial of the paper.

Various thermoplastic materials can be used in the cock of the invention. Appropriate materials with a suitable melting point which is lower than the temperature "at which the paper" is already adversely affected include polyamides _y polyvinyl chloride and polyethylene. A material to be used preferably schiailat below 160 ⁰ G.

Before being incorporated into the paper, the thermoplastic material can be present in various forms and be incorporated in various ways. A continuous single thread or a web of parallel threads or a perforated web is preferably used, that is to say a web that has many holes and thus practically represents an ITe t ζ. This net can be designed in various ways, for example woven, knotted or extruded. First and foremost, a chain made of polymeric thermoplastic material is involved, which is stretched in such a way that the individual threads between the nodes of the network are molecularly oriented. Such iietse can be produced by extrusion of a polymeric film, which is embossed, latched or punched in such a way that when the film is subsequently stretched in the direction of manufacture and in the transverse direction, the structure of the film is stretched so that a network structure is created in which the circles or eyes with the other neighboring knots utxrch thinner threads or strands of polymeric material are connected. The arrangement of the nodes xin - their spacing depends on the geometry of the impression on the surface of the impression roller and on the degree of stretching in the manufacturing and transverse directions. The method of making such wood is described in detail in British Patent Specification 914,409. If a paper with such an embedded scrap, which has threads with a high molecular orientation, is heated, the result is that the threads shrink back against the knots in such a way that a number of islands of thermoplastic material in a certain pattern distribution

209822/0660

remain, which are determined by the shape of the original IT network. The fact that the pattern is at the gate can be determined xmä can serve as a security test pass, which can only be copied with great difficulty. In most cases, the pattern can be determined visually in transmitted or reflected light, or both.

If the thermoplastic material is present in continuous form before it is incorporated into the paper, it can be incorporated during the actual settling or precipitation of the paper base material e3, i.e. the fibers during the formation of the paper web. For example, the material can be fed to the area of the papermaking machine on which ot, s Pap " ¹ " .- ·. ' is trained, that is, the orphan of a roll paper machine _{or on the wires of a Fourdriniermaschiiie r and zvra.3?} in a way that the material comes into contact with the cylinder at the point where a rope, vorzv-j / sweioe etv / a half of the substance of the desired paper web has already been deposited on the surface. As a result, the rest of the substance of the web is deposited over the material, v / although the drainage then takes place through the material, /. In this way, the material, for example a Hetz made of a polymer, can be completely embedded and is immediately enclosed by the material Paper web to be produced * The resulting web can be further treated in the usual way using vacuum canisters and a drying system !!, and the watermark structure can also be produced in the usual way.

If the paper consists of more than one overlying web one newly deposited fibers ^ ΐοτίίΐΊρ.π "hnTgnntellt. as he» etv / a at a cylinder mold machine or in gauze or tissue paper production If this is the case, the thermoplastic material can be introduced between two sheets that are to be superimposed on one another will. Pc.piexo made from more than one layer were previously unpopular for use as security paper because of the delamination or peeling mentioned above. By the subsequent melting or welding process of the thermoplastic Material, however, the layers become so with each other

209822/0660

/ i / l

connected with the fact that ice can appear melir when it is peeled open.

If the thermoplastic material in a continuous Fons about as ITetz before, it is preferably presented by a Benälter © us, in which it is introduced into Zioitfiarmonifcaanordnung, EO that a v / Eiterer strip _s adjoins the end of the strip of the Papierherstellungsmaschinc supplied to was "before the discharge takes place, so that the paper position" can take place continuously. The strips can, for example, be connected to one another by heat welding using water-insoluble adhesives odex *.

The thermoplastic material can be aj'Ji in other al3 of the already mentioned form were stored, for example can the thermoplastic material in the form of eiL'-iS powder or granules be submitted. In this case the material is preferred between two paper matorial layers, for example in the case of a tissue paper machine. The powder can be one-ocer multicolored, with the particles in random distribution can be mixed or a device is provided be to the powder in certain geometric patterns, such as strips of different colors in different sections bring in.

By treating the thermoplastic material appropriately before it is stored, various effects can be created. The Haterial, for example, dyes or color pigments or TrüLungspigmento be added, so that the material becomes less translucent than the rest of the surrounding paper or or, I-Ictallteilohen may contain or be metallized, to reduce um dia permeability or transparency, or even to the use of to enable automatic test devices. If the material is in the form of a sheet or sheet, it can be treated, for example by printing, before being stored in the paper. Furthermore, the material can be treated in such a way that after it has been stored in the paper and viewed in direct or continuous light, it reproduces a distinctive outline, or a patterned line.

209822/0660

The melting process can be so complete that the thermoplastic material melts through completely, but this is not essential in some cases it is sufficient to reach only ropes of the thermoplastic material / iron that jecr-3 of the core is not softened ens pad while eo g in the case of rush ^ '- ^ m XAE, when only the connecting threads corridors, while ^ö: .c * knot are not fully softened.. In every j? Alle should " ¹ te? The melting process should preferably be accompanied by a pressure treatment, in that the paper is allowed to run through between a pair of rollers, whereby the pressure through the rollers can immediately follow the heating or the rollers can be heated So that heat and pressure are applied simultaneously.The melting process can take place in every stage between: -? ii the formation of the finished web and the point at which the paper is supplied to its destination v / ix'i. This can take place specifically before, during or after the calibration and drying or before, during or after the conditioning and finally before, during or after the calendering.

As "already erv / äJrvt, the molten polymer can usually visually by observation of the paper either in reflected i or transmitted light detected v / ground of this review, v / ground the points, or other devices in the paper in its characteristic pattern distribution recognizable.. In continuous light, an uncolored polymer material appears as a point of greater opacity :, after an appropriate heat treatment, bo.i. the network then melted, as a series of colored dots.

Due to the embedded thermoplastic material, the tensile strength is increased in some cases raid the possibility of The scrolling of the paper is reduced. Another contribution however, this usually results from the greater thickness

209822/0660

due to the thermoplastic material »in the paper * This greater thickness can easily be determined by scanning. the Yiirlamg of such elevations, which are normally detectable on both sides of the paper, cannot be determined by corresponding 'Imitate embossing technology. '. ■. '' ■,

The network structure or thermoplastic material in others Form can be stored in such a way that it can be used as a single or multiple band is present in the horizontal or transverse direction of the paper, or a distribution over the entire paper can be provided. The sides of the ligaments can be parallel or sinusoidal odor in another regular or irregular pattern distribution lie to each other.

All these characteristic l / irkurcgen, otvrn alo pand more evenly or different colors, Γοπα or in one ab- The distribution of points or ribbons can be separated or collectively for the production of g .'-. nz certain characteristic Apply properties that have an easy effect on the Security paper can be determined, the r, I jeci. Not yet easy imitate lasocn by unauthorized persons,

To a \ xch other checking and recognition ^ - as well as payment means and devices at authorities and other designated institutions that issue and control security documents and papers, as possible, radioactive, metallic, ferromagnetic, fluorescent or other substances can also be used Security measures in connection with or directly in addition Material to be applied and applied. -.

The following are some examples to illustrate the Production of a security paper according to the invention be ben, which, however, in no way limit the scope of the invention.

Example 1. _

During the production of a paper "a hate was stored, ₅ - that in the tmd described above in particular in the tit described in 3," British patent specification 914 489; eliWä

209822/0860 J ^

had been. The net consisted of high-density polyethylene, which was "dyed red after the extrusion process by introducing appropriate pigments and was pre-embossed or punched so that on average there was a distribution of about 15 eyes or knots per" cm ² , where about 27.4 m dienes netsos with a width of,., etv / a 96 cm weighed about 0.5 leg. The Hetz \; was cut into 5 cm wide ribbons and fed to the trough of a sieve paper machine on which a roll mill paper with a surface weight of 80 g / m 2 was produced.

The angle of contact of the mesh belt with the wire screen was through corresponding guide devices set so that the on the wire sieve before bringing it into contact with the agitation Fabric corresponded to a surface weight of about 40 g / m 2. Ito it can be established that the under these conditions can be erupted Dehydration due to the agitation to total storage from paper barrel cm up to 80 g / m yielded v / obei dai- Pc'jier through and do the net was trained around.

The web was then transferred to a felt dryer in the normal manner Drying cylinder couched and then surface-sized. An ivcav.fsich.fc in a schematic representation of a part of the paper such a track is in Pig. 1 reproduced.

The web was then passed through an infrared heating zone in which the temperature of the paper was raised above the melting temperature of the enclosed network. After calendering, the paper was examined and it was found that no trace of the net structure could be found when it was torn. The red polyethylene dots left as eyes or knots could easily be seen inside the paper in both transmitted and reflected light. The presence of the safety device, i.e. the points, could easily be determined by scanning. A plan view in schema t tißcher display on the finished paper similar to Pig. ii: ,, is in Pig. 2 reproduced, while Pig * 3 shows an enlarged ^ cross-section through such a paper. It was found that the pads between the nodes of the thermoplastic network

209822/0660

Λ <

under the influence of heat and because of the previous molecular orientation, they were torn and shrunk back to the knots, so that a point pattern remained. These points are weak in _like Dir Lieht, in transmitted light, however well ^r. visible. From Ii ¹ Ig. 3 shows aiqh ;; that on both surfaces, ';

. chcn the pnpiereo in the area of the knot slight increases in the Scanning are detectable. Pig. 3 also shows that the

\ thermoplastic material aligns with the adjoining paper fibers «

The melted thermoplastic material gives the paper P * properties that are very difficult to re-grind by a forger, but which can easily be determined during an inspection and at the same time the material stored in the paper practically eliminates delamination of the paper ξ Vollkomraen au «.

Example 2,

As in Example 1 vmrdc a Wasserse.lolienpapier heated and when passing over oil-heated 3 orphans with a Oberflächcntemperatur of 180 ⁰ C during a! Dimlilauf speed of 5 m / min pressed. The conditions at the whale were changed until an examination of the water drawing paper showed that the agitation had melted. As mentioned before, the characteristic Sieherne itsnerkinale were also determined after the calibration and the usual final treatment,

Bciapiol 3.

A stretched, but pre-embossed sheet of polyethylene was colored in that stripes were printed transversely on the sehwitrsGm, red in trad = yellow with microcellulose varnish. ITach. The hunt had stripes of red, black and yellow stripes on the warrior. The agitation was then divided into 10 broad countries and dealt with in accordance with Example 2. The charalcberist l ^? Work left them. in ertigen i "j-paper easily NachV / iron.

209822 / 0B60

/fit

Example 4 »

As in Example 3, a colored net 1.47 m wide was prepared and fed to a multi-stage cylinder mold machine in such a way that it looked like the first web. Applying "the second rubberized web in 'contact'" can be done with the ¹ year ago and melting the network according to Example 2, the safety features can be easily detected. The paper also had an increased resistance to delamination.

Example 5.

A geuiäß Example 3 prepared network vmrde zv / een two preformed and dried webs eine3 V / assorseichenpapieres introduced "lurch Heißverpresaen according to Example 2, a Zusainmenhaften dp" ^1? Achieved layers and the Sicherlieitswirkuvi above-described ¹ / ar geg ^ ban. The Sicherheitsmerlcmale remained in other samples, I keep it after calibrating and calendering.

Example, 6>,

Torn paper Caoern were deposited on a moving, perforated band of wire mesh so that a layer corresponding to a paper weight of 10 g / m was formed, on which the web of a piece of paper produced according to Example 1 was placed The noise went through a ζ- wide v / ind layer chamber, whereupon a svrp.ite paper fiber layer with

ry - ■ ■

a surface weight of 30 g / m 2 was applied.

passing through pressure \; alzen v / urde the web with a v / ässrigen.iPolyvinYlasetatbindemittel impregnated and Jdann dried to water content of 5 i>.

The web obtained was then passed through a heating zone according to Example 2 let pass.

The test resulted in a firm, tough, ^ a {product in which the security merlanals SpWOhI ₄ imjreflekffiert. as well as, in the transmitted or refracted light,. £ were recognizable. ;

209822 / 0BS0

Example 7.

On a silk paper machine with four cylinders, paper was produced in four lanes "each having a surface weight of 20 g / m 2 and which were driven together to produce a single web consisting of superimposed lanes". containing the granules of dyed polyethylene. the funnel was positioned _such? that the granules in Sioli ± a llerstcllungsrichtung of papers he stretching en bands could be applied. on combination dor EinseTbahnon the Gruiralr-.tkorner warden enclosed between the two center lanes. the The resulting web then passed through nine Hai?.

? J? J_npiel 8.

A 300 Donier Polyamidterpolyner, nylon 66, Itylon contained with a melting point of 12O ⁰ C 12 was metallized by vacuum deposition of Aluminiuri. The iono-filament was then fed to a cylinder of paper in such a way that the third touched the cylinder according to the hierarchy of paper fibers, which corresponded to a surface weight of 4-0 g / m for the remaining rotation of the I ¹ OrLa, paper barrels, which also corresponded to a basis weight of AO g / n, were still knocked down. The paper web was then couched and dried over steam-heated rollers. During this latter process, the polyamide thread melted.

An underlay of paper in continuous light left c! On detect metallized thread, but it was impossible to split the paper or the thread in the area of this thread line pull out.

Boinpic l 9.

A polyethylene-l-ionofilament with a melting range _? which began at about 120 ^° C., was printed with microcellulose dye as it passed through a series of rollers, each of which was synchronized in this way

209822/0660

- ₁₂ - 2156388

were that a 2 mm long paraffin marker in each There was a 5 mm gap on the thread.

In this way a number of points were made on the monofilament upset.

The monofilament was then incorporated into the paper in the manner described in Example 8. Both? Examination of the dried Paper showed 3icii both broken in du.roli {3elienden5 as well as in the reflected light a number in a certain Distance between standing colored dots inside the paper «,

Example 10 ,

As in Example 9, a paper produced vrarde _s in which a for producing a pigmented with Trübuiigswirkung Sütanlioryd rs monofilament vmrde stored, v ix obei the Eadeu: not discover getroclcneten paper was -and only the colored dots were visible.

203822/0660

Claims (1)

Claims Process for making clay security paper with im Paper of embedded non-cellulosic materiax, characterized in that as non-cellular oes material a thermoplastic material is used and that the clearance is increased to such an extent that the Ha t er ial melted. 2. Verx mixer according to claim 1, characterized ge - zei ° nnet, because, ß as a thermoplantisehes material verv emlot v / irc !, because, s " ^{melts at a temperature below 160 0} O O. 3. The method according to claim 1 or 2, characterized in that that the thermoplastic material coherently during the Aböetzens "or .. the deposition of the Papicrnni: ne is stored to form a paper web «. 4. The method as claimed in claims 1 or 2, in which the paper is made from melireren uberei.nant! The stored BoJinen is made from individually sent l ^il asej? iiiaterialschicjii £> 5f, characterized in that the thermoplastic material is introduced between two sheets to be stored one above the other. *>. Ancestors according to any one of claims 1 to 4 ·. through this characterized in that the thermoplastic material is presented as a hotζ, in which the between the nodes lying pads or strands molecularly oriented by stretching and that the thread pieces or strands when increasing the temperature bx3 for melting the material for Shrink back the formation of islands of polymeric material in the paper, 209822 / 066C -H- 6. The method according to claim 5), characterized in that that the ITets in a "known way" for making one from pad on tiles or strands between Betz structure formed by extruding a film made of polymer * material, embossing haw Eastern and Recken doß Film is produced in the transverse direction, 7. Method according to An ^ -j-Ucii 1 or 2, thereby g e k e η. η draw ";. that the thermoplastic material as a continuous thread or yarn is presented. 8. The method according to one of the Anopriiche 1 "to 7, thereby gelcennze lehnet, öiS üy © thermoplastic I-iaterial Parb ~ and / or restorative additives are added. 9. Terfahren ntvch eii'tem of claims 1 "to 1, characterized in that αεϋ2 · daa thermoplastic material is coated prior to storage in the paper" for example, by a driver or by metalization ". 10. Verfaliren according to any one of the preceding claims, characterized in that the melting of the thermoplastic material at the same time as the application of pressure takes place in that the paper is passed between a pair of rollers. 11. "The method according to any one of the preceding claims, characterized in that the thermoplastic Material is presented in strip form and η the point at which it is stored in the paper, is fed from a bale or package, which is folded in an accordion "is presented. * Method according to claim 11 _r, characterized in that the lead ends of the strips of successive folded packages with the terminal end η of the preceding bundle form a continuous one 209822/0660 -Ί5 - Connect strips to ground . 135. Security paper with non- ^ embedded in the paper 'Zelluloüera material, because you rc \ ^ ekc "n η ae 1 ch - / * / i- ^V ! ln et that dao material a-' in situ melted-in lolcal. ν '' with the 'fiber material dob papers' mixed thermoplaotis I'Imaterial is * 14, security paper according to Annyruch 13 »characterized in that a tlO ^ rtioplastic material is present as islands in the paper, classified according to the distribution of rights, 15, security paper according to claim Y'j odor 14? characterized by the fact that the therraoplantic material has a perfume different from that of paper. 16, security paper according to claim 13 or 14, d a d ti r c Ii marked that there «thermoplastic Material is meta'.liuiert » if