Biaxial leveling of magnetic plates

FIELD: process engineering.

SUBSTANCE: invention relates to printing and can be used for imaging with the help of ink containing colour-changing metal or magnetic plates. Method of leveling multiple directed nonspherical plates supported by lengthwise tape with coating containing nonspherical plates oriented in magnetic field. First and second magnets are arranged at first side of tape feed and second magnet is arranged between first and third magnets on second side of tape feed path. First and third magnets feature identical polarity. Second magnet features polarity unlike that of said first and third magnets. First magnetic field surrounding the feed path exists between first and second magnets. Second magnetic field surrounding the feed path exists between second and third magnets. Magnets are arranged so that multiple nonspherical plates directed by magnetic field and moved along tape feed path make first turn on passing by second magnet during relative displacement of tape and magnets. Proposed method comprises relative displacement of at least tape supporting the plates, or magnets that make two pairs of complementary tractive magnets. Multiple plates oriented in magnetic field can perform multiple turns.

EFFECT: higher light reflectance, better chromatic properties of printed articles.

14 cl, 11 dwg

 

The level of technology

Pigment particles dispersed in a binder substance of printing ink and applied when printing on the surface of the substrate, can have a high or low coefficient of reflection of the incident light. Their reflectivity depends on several different factors. Inherent pigment particles optical properties significantly affect the reflectivity of the pigment particles. Metallic pigments with strong reflection particles are plate-shaped, consisting mainly of aluminum or other highly reflective metal. Metallic effect pigment particles is achieved by the interaction of different individual characteristics, mainly, such as particle size and shape, and also depends on the ability of the pigment to float or not to float.

The ability of a pigment to float or not to float is a parameter of the pigment based on the ability of the pigment particles "float". Pop-up pigments float on the surface film of printing ink due to interfacial surface tension. They form a coherent surface film, the reflective properties which depend on the dispersion of particles. Newsplease pigments completely wetted with binder and uniformly distributed throughout the coating thickness. Su is Livadia pigments described in the work of the author G.Buxbaum "Industrial Inorganic Pigments", Wiley-VCH, ISBN 3-527-28878-3, 1998, str. Because pop-up and newsplease pigments behave differently, they provide a different appearance of the coatings. For example, particles pop-up aluminum pigments will be distributed more evenly on the surface of the film, providing a decorative finish such as chrome plating.

A known method of manufacturing particles "pop-up" pigment by milling the pigment in a ball mill in the presence of various lubricants, as described in U.S. patent No. 6379804 author Ackerman and others In this way is usually used stearic acid. Acid repels liquid paint or binder printing ink from the surface of the pigment, pushing the particles towards the surface of the partition between the air and the surface of the printed ink. In the pigment of the plate surface to the surface of the print, giving it a mirror appearance. However, the disadvantage of this method is the low abrasion resistance of printed materials containing such "pop-up" records, as the acid prevents the adhesion of the binder printing ink to the surface of the plates.

Image printed with newsplease pigments, unlike images, printed with "pop-up" pigments which do not have a smooth mirror appearance. On the contrary, the surface e is their looks speckled with sequins". On the other hand these printed images have very good abrasion resistance, as the binder printing ink forms a strong bond with the unmodified surface of the pigment particles. It is preferable to create an image with a strong reflection, printed using newsplease pigment particles dispersed in the layer of printing ink and located parallel to the surface of the printed ink, similar to a pop-up particles.

There is the possibility of orienting the particles in the layer of printing ink from the outside. For example, in U.S. patent No. 2418479 author Pratt and others referred to the application of bright metallized layers of paint with a brush or using a knife.

In U.S. patent No. 2418479 author Pratt also discloses a method of creating pigment particles with properties similar to pop-up the pigments, to align them in the applied magnetic field. The particles used should be magnetic and preferably reflective. Pigment particles dispersed in a liquid printing ink deposited on the surface of the substrate, and exposed to an external magnetic field, tend to be aligned with an easy axis of magnetization along the magnetic field lines. Oriented particles become stationary after curing the connection is the pollutant specific. In science the term "easy axis of magnetization" refers to the energetically favorable direction of spontaneous magnetization of the ferromagnetic material. This axis is determined by various factors, including magneto-crystalline anisotropy and shape anisotropy. Two opposite directions along the easy axis of magnetization is usually equivalent, and the actual direction of magnetization can be any of these areas.

The alignment of magnetic particles dispersed in the layer of organic binder on the surface of the substrate and is subjected to an external magnetic field, is described in many books and patents, for example, the author .Denis Mee, "Magnetic Recording", McGraw-Hill Book Company, ISBN 0-07-041271-5, vol. 1, 164, or author Finn Jorgensen, The Complete Handbook of Magnetic Recording, TAB Professional and Reference Books, ISBN 0-8306-1979-8, 1988.

C.D.Mee describes the alignment of the pigment particles in the media when the application of a magnetic field parallel to the direction of movement of the tape. The preferred configuration in the circuit with permanent magnets is the location of one magnet with opposite poles on both sides of the tape, which is in the Central plane or perpendicular directional component of the magnetic field. Also in this work describes the various magnetic devices for orienting the purpose of the magnetic pigment particles in the direction of the tape. These devices have common characteristics related to the alignment of the pigment particles relative to the surface of the substrate. The links clearly stated that magnetic tapes easy axis of magnetization of the particles is aligned in the direction of the tape.

Most magnetic materials used in the media, are quasi-one-dimensional, i.e. with one dimension much larger than the other two, for example, shaped like wires or needles. As shown in figa, a particle having the shape of the plate 101, can be considered as two-dimensional (XY) physical body due to the large aspect ratio of its dimensions, i.e. X and Y are significantly more Z. When the plate is induced by the magnetic field it is exposed to the magnetic moment whenever dipole vector is not parallel to the external magnetic field. The existence of a magnetic moment leads to a rotation of the plate with an easy axis of magnetization in the direction of the magnetic field lines 102 of the external field and the dipole vector of the plate becomes parallel to the magnetic field vector. The disc stops spinning and occupies a stable position until the field is not removed. In other words, the plate is oriented with its longest diagonal, which can be considered as the main dimension, for example the X-coordinate parallel to the power lines of the applied magnetic field, as shown in figa.

However, the second dimension Y of the plate may not always be parallel to the substrate. In fact, the authors of the present invention note that the specified dimension of the plate always has some small angle relative to the direction of the applied magnetic field. This small tilt does not have a significant impact on the overall performance characteristics of the media, however, it becomes very significant in the paint and printing industries in the production of reliable, highly reflective coatings on various substrates.

For many decades, attempts were made to produce a shiny coating containing a reflecting plate material. The author is Pratt and others, 1947 in U.S. patent No. 2418479 described the process orientation of the metal plate pigments for the manufacture of shiny surfaces. Pigments, such as ferromagnetic plates in the paint film, in response to a magnetic field, are arranged with the formation of a homogeneous flat surface. The surface of the product and the plates are placed in a magnetic field. This method requires that the surface coated film was placed between the magnetic poles so that each long or important dimension of plates oriented in the direction of the of the magnetic field, like a compass needle. Pratt and others describe the method, which includes the introduction of raw film containing a ferromagnetic plates in a magnetic field, while the directional angle between the film and the magnetic field is changed from parallel to perpendicular for a short period of time to dry the film. Changing the direction of the angle between the film and the magnetic field may be caused by rotation of the film or flat rotating magnetic field. Electromagnetic system described in the patent, generates a rotating magnetic field, allowing the plate to change its direction with a frequency of 5 to 10 Hz. The magnetic field changes its direction by 90°. The magnets in one of the devices were hollow and through the hollow center of these magnets continuously at a given speed was a moving substrate.

Although the invention that the author is Pratt described in U.S. patent No. 2418479, was a step forward in the field of technology, it had a number of limitations. The method used Pratt, is unsuitable for products with a large surface, as in this case, extremely high magnetic field strength that is difficult and expensive to implement. In addition, the described method does not provide the desired orientation of the majority of plates arranged in a film or coating on the non-planar surface of a curved or other attributes of the Noi form. One example of such a surface element is of annular shape, or the element with the aerodynamic profile of the power equipment, like gas turbine Assembly.

Author James Peng in U.S. patent No. 4859495, assigned to the Eastman Kodak company and published in 1989, describes a method of manufacturing a film for magnetic recording with a magnetic plate, oriented in any particular direction, which includes the use of magnetic ink on the substrate, exposing the substrate containing the uncured magnetic paint, the influence of a rotating magnetic field with magnetic components, lying only in the plane perpendicular to the specified direction, and the subsequent curing of the magnetic paint. In the layer of organic binder containing dispersed magnetic plate deposited on the surface of the moving tape, is the orientation of the plates. In one of the described magnetic systems, there are four Helmholtz coils. In the second embodiment of this invention describes the system of a rotating magnetic field that does not have the components of Z, when moving layer of the magnetic paint in a liquid state at a high velocity onto the substrate. This variant implementation of the invention is suitable for the manufacture of magnetic media is wide in a very large range, for example, with a width of up to thirty and even fifty inches, as there are no restrictions on width, which occur when the use of Helmholtz coils. In this embodiment of the invention uses two conductive plates such as copper plates, which are located above and below the moving tape. The current in the plate above the moving tape runs in the direction corresponding to the width of the moving tape. The current from another source voltage flows in the plate located under the moving tape in the direction of the moving tape. These two current from two voltage sources have a phase shift of 90°, which creates a rotating magnetic field components in the X and Y directions, in the absence of a magnetic component outside the film plane or in the z direction. Disadvantages of this method is that it is also unsuitable for substrates with large surface area, because there are problems with the uniformity of the orientation of the plates on a large surface and with the violation of the proper orientation of the plates at the exit of the magnetic field, and by applying this method it is impossible to carry out on-site drying paint ultraviolet radiation.

In the application for U.S. patent 2004/0052976 author Buczek and others described the alignment of non-spherical particles and is the main dimension, oriented generally along the surface of the product, relative to the particle. Particles placed to consolidate their position in the liquid medium with high viscosity, are guided under the action of the force applied to the particles. Power includes the torque of the magnetic field, the force of the flow of a liquid medium, the force of gravity and force only one of the surface tension, or in combination with gravity. To adjust the brightness or reflectivity of the surface coatings and prints used non-spherical metal particles in the form of plates with the main dimension relative to the orientation of the plates and the dimensions relative to the surface of the product, determining the degree of brightness or reflectivity. Although this method is to some extent applicable to the manufacture of bright paint, it is not practical when you print vivid images on the upper surface of the wide ribbon, moving, for example, at speeds from 100 to 500 ft/min

In another U.S. patent No. 5630877 author Kashiwagi, etc. related to magnetic alignment of the particles, describes the alignment of magnetic particles or platelets dispersed in the organic binder substance and exposed to an external magnetic field. Describes a method and device for and is for drinking, preparing products, having the image formed under the action of magnetic fields using simple procedures make it possible to form the high speed required easily recognizable images of various shapes and to form a colored product produced by the above method using the specified device. However, the patent does not describe a method of manufacturing a decorative coating with coordinates X and Y, parallel to the wide surface of the film, moving with great speed.

Disclosure of inventions

The present invention is to propose effective ways of aligning multiple oriented non-spherical plates supported by the longitudinal tape, when high-speed printing on a wide belt.

The first variant of the method lies in the fact that the perform the following steps: a) provide the tape with a coating containing non-spherical plates, oriented in a magnetic field; b) provide the first and third magnets with the first sides of the path of feed of the tape and provide a second magnet between the first and third magnets with the second opposite sides of the path of feed of the tape, and the first and third magnets have the same polarity, and the second magnet has a polarity opposite to the polarity of the first and third magnets, so the first is ignitee field, covering the specified flow path exists between the first and second magnets, and a second magnetic field, covering the specified flow path exists between the second and third magnets, and the magnets are placed so that many non-spherical plates, oriented by a magnetic field moving along the path of feed of the tape, made the first turn with the passage of the second magnet during the relative movement of the tape and magnets; and C) provide a relative displacement of at least tape supporting plate, or magnets, forming two pairs of complementary two attracting magnets.

When carrying out step (C) the tape is moved along the feed path, which is determined by the line, or move the magnet along the path of feed, or move the plates and the magnets along the path of submission.

When carrying out step b) the first magnetic field and second magnetic field are determined, respectively, first and second magnetic force lines, which are essentially parallel to the tape, the first magnetic lines of force cross the tape at the first angle relative to the path of feed, and the second magnetic lines of force cross the tape under a second angle relative to the path of feed, and the first and second magnetic force lines are not parallel and non-orthogonal to the feed direction of the tape./p>

In particular, the first magnetic field exists between the first and second magnets, the second magnetic field exists between the second and third magnets, while the first and second magnetic field across the flow path and the direction of movement of the tape.

First, second and third magnets, in particular permanent magnets.

Preferably, also provide at least a fourth magnet, which is placed on the same side of the feed path, and a second magnet, with the third magnetic field between the third and fourth magnets crosses the flow path, and the fourth magnet has the same polarity as the polarity of the second magnet and the opposite polarity of the third magnet, so as to create magnetic lines of force crossing the path of feed of the tape, while the magnets are placed so that many non-spherical plates, oriented in a magnetic field moving along the feed path, made another turn with the passage of the third magnet when moving tape or magnets.

In the private embodiment, step b) the first and third magnets mounted in the first wheel made with the possibility of rotation, or supported them, while the second magnet is mounted in the second wheel is made to rotate, or is supported by them, and a flow path corresponds to about the Asti between the first and second wheels.

Preferably, the plates have a size of from 2 to 100 μm. The size of the plates varies by not more than 20%. Plates are a set size and shape.

The second variant of the method of multiple alignment-oriented non-spherical plates is that, perform the following steps: a) provide the tape with a coating containing non-spherical plates, oriented in a magnetic field along the path of feed of the tape; b) provide a first set of magnets on one side of the feed path and provide the second set of magnets with opposite sides of the path of feed, with the first set and second set of magnets are staggered so that the magnets were not directly opposite each other along the feed path, the first set of magnets and the second set of magnets is located near the path of feed in different places and form many pairs of magnets with opposite polarity facing the feed path so that each pair of magnets is complementary polarity, providing a magnetic field that traverses the flow path, and the magnets are placed so that many plates, oriented non-spherical magnetic field moving along the feed path, made of multiple turns, when they are magnets along the tape, and b) provide the provide relative movement, at least the tape supporting plate, or magnets, forming a pair of complementary two attracting magnets.

Preferably, adjacent pairs of magnets have a common magnet.

Technical result achieved in the implementation of the invention, is that the oriented plates contained in the coating over the entire surface of the tape aligned complanare relative to each other and relative to the surface of the coating on the tape.

This result is achieved through the use of the alignments oriented non-spherical plates dynamic magnetic field created using a specific relative position of the magnets provided on the stages b). Many of the plates form a stable structure that is similar to the sheet, due to the dynamic magnetic field, which is in contrast to known solutions has a configuration that causes the plates to repeatedly rotated at angles less than 90° in the plane of the substrate until then, until you have formed a stable structure. In a magnetic field plates are oriented so that their two main measurements were parallel to the surface of the substrate, to ensure the brightness of the image, similar to the brightness of the image when using "pop-up pigments".

The present invention is also allows you to solve other tasks, associated with drawing on a wide substrate with high speed, highly reflective wear-resistant images with ink containing magnetic plates, in particular:

- the formation of sheets of magnetic plates in a layer of printing ink;

- increase the color saturation of the image caused by the printing ink containing magnetic color changing pigments;

- print coatings with reflectivity, "is similar to the foil and having brightness or color change;

- the creation of a secure document with a distinctive protective signs, applied printing ink containing magnetic changing colour plates, oriented in the applied magnetic field so that the two main dimensions of the plates were essentially parallel to the surface of the printed ink, resulting in an increase in color saturation and greater dynamic colour area coverage;

- application by printing coating containing magnetic plates, which are assembled into a two-dimensional continuous sheets;

- the creation of a secure product printed by the printing ink containing a reflective or change the color pigments on the surface of a broad and fast-moving tape or paper sizes, for example, up to 60 inches at a speed of from 50 to 300 ft/min

In accordance with us is oasim invention, in particular, it provides a highly reflective alignment of the magnetic pigment platelets, resulting in the movement of the tape at high speed turns out to be mirror finish. Such printed products can be produced using a magnetic reflective or color changing pigments dispersed in a binder substance ink.

The authors of the present invention have discovered a way of neutral alignment pop-up multilayer optical plates, dispersed in an organic binder substance deposited on a flat, fast-moving tape, and then exposed to an external magnetic field before the formation of the plates together, such sheet, which (after curing suspension) has optical reflectivity, comprising at least 50% of the reflectance of the same optical structure deposited on glass or other suitable smooth substrate. Magnetic printing inks since 1956 used in the recognition of signs or symbols, known as the recognition of characters printed with magnetic ink (MICR), and are also used in magnetic storage media. Each of the magnetic printing inks is a magnetorheological (MR) fluid with more or less pronounced ow through Riazanova magnetic field. Rheological properties of magnetic printing inks depends on the physical and chemical properties of the binder and magnetic particles dispersed therein. Rheology of suspended particles is well described by the author S.W. Charles. Further description of the rheological properties of the magnetic printing inks can be found in "Rheology of particulate dispersions and composites", CRC Press, ISBN 1-57444-520-0, 2007 in the Journal of Magnetism and Magnetic Materials, 65 (1987), 350-358.

Flow characteristics of magnetorheological fluids are substantially dependent on the size, shape and magnetic susceptibility of the magnetic particles.

There are two well-studied magnetic fluid. Ferrofluid is called a suspension containing buried nanoscale colloidal magnetic particles, if it becomes highly polarized under the action of magnetic fields. A suspension of magnetic particles in the micrometer size called magnetorheological (MP)if it significantly increases its viscosity under the action of an external magnetic field. However, there is another kind of magnetorheological fluid containing magnetic plates micron size, which have a dimension with high aspect ratio. These fluids are deposited on the surface of the products, are used as magnetic paints and printing inks, which are on the intensity of the applied magnetic field readerwarranty magnetic plates in the field. The viscosity of the ink depends on the magnetic field strength, magnetic field direction, particle concentration, viscosity of the binder, the magnetic susceptibility of the magnetic plates, etc. an Example of change of viscosity with increasing magnetic field shown on fig.1b.

The magnetic pigment, consisting of a flat magnetic plates with an average size of 20×20×0.5 microns, was mixed at a concentration of 20 wt.% with the binder of the ink for rotary screen printing. The viscosity was measured using Brookfield viscometer model DV-II at 50 rpm viscosity Measurements were carried out without application of a magnetic field and with the application of various fields generated by the two permanent magnets placed at different distances from each other to create a magnetic field of varying intensity. Measurements showed that in the absence of magnetic field, the viscosity was 1742 SP, and when the application of the magnetic field was observed the increase of viscosity with increasing field strength and the magnitude of the field 0,74 T (740 HS) viscosity was 3544 SP.

It is known that individual magnetic plate from dispersed in a liquid binder substance and induced magnetic field acquires a dipole moment and is oriented with the axis of easy magnetization along the magnetic Silverline, suppressing total field intensity to the maximum extent possible and reducing the energy that is accumulated in this field, to a minimum. A large number of plates, suspended in the diluted binder substance, identical to the orientation of the magnetic field. When a high concentration of platelets in suspension plate under the action of static fields are subjected to various interactions. Detailed description of the mechanism of formation of chains formed by the plates presented in the work of authors J.H.E Promislow, A.P.Gast, "Aggregation kinetics of paramagnetic colloidal particles" J.Chem. Phys.,1995, 102, 5492-5498; and authors E. Clement, M.R.Maxey, G.E.Kamiadakis; "Dynamics of self-assembled chaining in magnetorheological fluids", Langmuir, 2004, 20, 507-513.

Particles dispersed in a binder substance and subjected to a magnetic field, simultaneously experiencing Brownian motion, bipolar magnetic attraction and many-particle hydrodynamic interactions. Particles together, forming patterns of surfcaster, such as chains, when the dipole strength (describing the relation of magnetic attraction to chaotic diffusion) exceeds a critical value. Chains are formed due to the attraction of the magnetic North pole of one particle to the South magnetic pole of the other particle, and so on. The chains are arranged in the direction of the applied magnetic field, as is shown in figure 2.

Figure 2 presents 16 plates 201 diamond shape with the Northern (black) and southern (white) poles, with illustrative purpose indicated in the drawing with different colors. The direction of the external magnetic field indicated by arrow 202. Plates formed four chains I-IV (shown in dashed lines) in the direction of the field 202. Each chain consists of four plates: 1-4, 5-8, 9-12 and 13-16. After a time, when the engagement plate/chain and chain/chain there is a continuous increase in the size of the congestion and increase the viscosity of the entire system.

However, when an abrupt change in direction of magnetic field, shown in figure 2, for example, when you rotate it by 45° counterclockwise, the plate instantly begin to rotate around their centers until such time as a new force of attraction of the applied magnetic field does not generate new chain, as shown in figa. It is important to note that the plates 1-16 figure 2 and figure 3 are physically able to maintain their position on the substrate, however, there is a change in the orientation of their poles at 45° counterclockwise. As a result of reorientation of the pole plates is formed along the new direction of the field of new chains from the same plates 1-16, previously shown in figure 2. Now the plates 5, 10 and 15; 1, 6, 11 and 16; 2, 7 and 12; 3 and 8; 9 and 14 formed apock is, shown in dotted lines in figure 3. In another change of direction of the field will be formed of other chains of the same records.

In the limiting case, the magnetic field can change its direction continuously. This occurs when the rotating field, as described by the author is Pratt in U.S. patent No. 2418479. Pratt mentions the increased brightness of the paint coating when the substrate with a layer of wet paint was placed between the poles of two permanent magnets and it revolved. Magnetic plates, dispersed in a binder substance and subjected to a rotating magnetic field, simultaneously experiencing the action of the magnetic moment, which stimulates their individual rotation in the direction of magnetic field lines, the action of centripetal attraction, which is a magnetic attraction to the center of the domain, and are subject to the interaction of the induced currents. Thanks hydrodynamic repulsion plates balanced by the centripetal attraction of the magnetized plates is the formation of aggregates of several plates that rotate at a speed dependent on the distance between the plates. Individual magnetic plate from dispersed in a liquid medium rotates easier around its Z-axis, as the resistance of the fluid on the edge of the plate is much less than during the rotation of the plate around its axis X or Y. This is due to the aspect ratio of the dimensions of the plate. Several metal plates, rotating in the same plane, form a unit, which has a strong reflection.

According to the author of the invention, methods and processes disclosed to date are not suitable for printing and alignment plates using a wide substrate moving at high speed, and therefore it is desirable to have methods that, when printed on a wide substrate will ensure high performance. In the above-mentioned patents Pratt and others, and Peng and others describe processes in which the magnet or magnets are located on both sides of the tape or below the ribbon. However, these processes impose restrictions on the width of the tape, since the magnitude of the magnetic industry of the applied magnetic field decreases rapidly with increasing distance between the poles of the magnets. The rotating magnet, which Pratt described in the patent, in practice, cannot be made powerful enough to be used under a wide ribbon. In addition, different parts of the wide tape will change the delay time of the rotating plates so that they are oriented in a rotating field, and will not be achieved uniformity of the coating. Another negative aspect of the idea that redoil Pratt, is that plate, spread in a layer of wet paint on the surface of the tape, which moves on top of a rapidly rotating magnet will simultaneously rotate and move in the direction of the tape path of a corkscrew.

Another issue you need to consider occurs when moving the tape aligned with the magnetic field of the plate out of the field. The magnetic field produced by any magnet, is inhomogeneous. When the tape runs along the magnet plates, dispersed in wet paint applied to the surface of the tape, immediately react on the field and take a different orientation relative to the substrate. The orientation of the plates at the exit from the field differs from the orientation of the plates in that part of the field where they acquire this desired orientation. In the printed image, which are aligned plates, the output of the magnetic fields become "blurred"because the contours become fuzzy and lose contrast.

To align dispersed in the layer of wet paint magnetic plates, so that the two main axes were parallel to the surface of the substrate, the inventors have applied the dynamic magnetic field generated by the magnetic setting, located under the substrate. It is the position of the magnetic device, creating rebeau the orientation of the plates, can be used for substrates with unlimited width. The device generates a magnetic field with a guiding angle less than 90°. The tape can move at high speed over such magnetic systems or through them. Instead of rotation, disclosed according to the prior art, the field rapidly changes its direction, causing the plate to oscillate rapidly as long as both the principal axes of the plates will not become parallel to the substrate. When drying UV inks containing plates, oriented in a magnetic field, eliminating the negative effects associated with the release of LPS from the magnetic field.

The basic principle of dynamic magnetic systems described in U.S. patent No. 7258900 author Raksha, etc. In the specified patent describes the alignment in the transverse direction of the tape magnetic plates, dispersed in a binder substance ink caused when printing on fast-moving substrate. Plates are aligned between the two rows of stationary magnets placed under the tape, as schematically depicted in FIGU, which is the illustration of the method used. Flat substrate 22 is moved toward the reader. Image 68 and 70 deposited on the upper surface of the substrate 22 of the printing ink containing magnetic plate 16. Paint would be the and damp, when images 68 and 70 have been entered in the field generated by the magnets 62, 64, and 66. The magnets generate a magnetic field with lines of force 72, which are almost flat and parallel to the substrate in areas where the substrate is located printed image. The alignment of the plates 16 in the raw images 68 and 70 along the magnetic lines 72 was almost parallel to the substrate.

4 shows a top view schematic diagram of a device for alignment of the plates according to the prior art. Tape 401 is moved in the direction of arrow 402. Layer wet paint 403 contains magnetic plates 404 and 405. The magnets 406 and 407 are located under the belt, as shown on figv. Plate 404 deposited on the tape 402, do not have any specified orientation. As soon as the records on the tape are in the field generated by the magnets 406 and 407, they are guided across the tape by the magnetic field 408, while their plane almost parallel to the tape.

The present invention is to offer the best way of leveling plates in high-speed printing process, for which the width of the ribbon is not the limiting factor.

Brief description of drawings

Examples of carrying out the invention will be described in conjunction with the drawings, in which:

Figa from the representation of magnetically oriented plates or particles, exposed to a magnetic field, and the alignment of the plate relative to the magnetic field is along the X-axis of the plate.

Fig.1b is a graph of viscosity changes depending on the magnetic field.

Figure 2 - graphic image 16 diamond particles forms or records from the Northern (black) and southern (white) poles, for illustrative purposes, are indicated by different colors.

Figa - graphic image, like the image in figure 2, and plate or particles spinning along magnetic field lines, forming a sheet.

Fig.3b device according to the prior art, whereby an attempt was made to ensure flatness and alignment of plates located between the two magnets.

4 - device according to the prior art, in which the plate moves between the two rod magnets are aligned along the magnetic field lines generated by the two magnets.

Figure 5 - one of the embodiments of the present invention, in which the staggered magnets with opposite polarity, for example, North - South or South - North, displaced along the feed direction of the tape to ensure rotation of the plates that the tape bears in the feed direction, resulting in plastinki magnets are moved relative to each other.

6 is a more complex arrangement of multiple magnets placed exclusively parallel to the feed direction of the tape, causing the rotation of the plates in the coating before drying.

Fig.7 is a diagram showing changes in color, showing the difference between the two coatings, and the plates of one of the coatings were subjected to rotation according to the method of the present invention, and another plate cover does not rotate.

Fig is a graph showing the brightness non-orientable covering in comparison with the oriented coating according to one of embodiments of the invention and in comparison with foil.

Fig.9 is one of the embodiments of the present invention, which uses a series of rollers on an axis for rotation of the plates according to the method of the present invention.

Detailed description of the invention

According to the invention to create a dynamic magnetic fields can be used electromagnets AC or DC or permanent magnets. Figure 5 shows a top view of the device according to one of embodiments of the invention.

According to figure 5, the tape 501 is moved in the direction of arrow 502. Printing ink 503 containing magnetic plate deposited on the surface of the belt 501. Figure 5 magnetic plates are presented on the example of one plate 504 on razlicitih leveling binder in the matter of printing ink while moving the plate relative to the magnets 506-508. When moving tape plates are subjected to the influence of the magnetic field generated by the magnets. The magnets are arranged in a zigzag manner with corners 510 between them, constituting less than 90°. After applying the ink 503 tape 501 is moved in a magnetic field generated by the magnets. The plates are oriented in directions 509 magnetic field, shown in figure 5 by dashed lines. The tape is moving in the direction 502, passes through a magnetic field, the direction 509 which is constantly changing. Plate 504 is subjected to rotations of the arrows shown in the drawing, in the plane of the tape, with the angle 510 of rotation defined by the zigzag arrangement of the magnets. The inventors have found that the angle 510 in the range from 45° to 90° is preferred. The front and rear of accumulations of magnetic plates, passing through the region of alignment between the magnets, also interact with each other, as shown in figa. Plate rotating in a magnetic field, are subjected to forces in different directions. Active forces are macroscopic forces due to the applied magnetic field and the microscopic forces imparted fields of neighboring dipoles. The force acting on the unit disc, is the sum of the forces generated by each field. Records will be re ematica in the plane of the tape, until you increase the magnetic susceptibility of the layer of printing ink along the XY directions, thereby maximizing the total susceptibility. Plate, until the end of the movement between the magnets continuously form associated lamellar structure in which the magnetic plates with their axes XY oriented parallel to the tape.

Figure 5 shows the linear arrangement of permanent magnets that provide a specified change in the field direction, which moves the plate. You can combine together several lines of magnets and install them on the printing machine under a wide ribbon, as schematically shown in Fig.6, where the tape 601, with illustrative purpose shown transparent, covered with square tabs 602, which in the previous printing process, not shown in the drawing, was applied printing ink containing magnetic plate. The cube-shaped magnets 603, grouped as shown in figure 5, are located in the immediate vicinity of the tape 601 and directly underneath it on a printing press, not shown in the drawing. The tape can be of different width from 6 to 72 inches. The moving speed of the belt can be changed in the range from 10 to 300 feet per minute, the number of magnets in one row along the tape may be, for example, from 4 to 40 or more. Passing through the magnetic field of permanent magnets in the direction the attachment tape, indicated by the arrow 604, the plates are rotated in the plane of the tape up until not form a stable plate-like configuration with the axes X and Y parallel to the tape.

As found by the authors of the invention can be used in various assemblies of magnets to ensure rotation of the magnetic plates in the plane of the substrate when it is moving. The magnets may be electromagnets AC with adjustable direction of the magnetic field that they generate when moving tape. Can also be used in the Assembly of permanent magnets with opposite polarity. The magnets may be located under the belt, as shown at 6, or above and below it (if the Assembly of magnets consists of two parts). The main characteristic feature of all these assemblies of magnets is their magnetic field, which rotates the magnetic plate in the plane of the fast-moving belt. Alternative color changing magnetic pigment can be used to print trademarks with high color saturation on the banknotes, securities, documents, identity cards, etc. as shown below in the laboratory model.

Replacement of the static magnetic field for aligning the plates on the dynamic magnetic field pozvolilo radically increase the reflectance of light and chromatic properties of the print is s products. The inventors have found that you can print printing inks containing a flat reflecting plate, and the reflection coefficient of the printed layer is at least 50% of the reflectivity of the mirror.

It is important to be dried sheet Assembly of plates in a dynamic magnetic field, as described by the author of Flex in the early patents/applications. The direction of the magnetic field at the exit of the substrate from a magnetic field different from the field direction, in which the plates are oriented parallel to the substrate.

An example of carrying out the invention

Magnetic color changing pigment was manufactured by vacuum deposition of thin film coatings with Golden-green interference on the upper surface of a substrate of polyester. One part of the substrate was cut off for further color measurement. The remainder of the coating was separated from the substrate, crushed and sorted to the pigment powder with a size of 20 μm, as described Flex in earlier patents. Pigmented plates were dispersed at a concentration of 20 wt.% in a clean, cured under ultraviolet light, a printing ink for rotary screen printing company Sericol and in the paint applied to the surface of the paper using the technology of screen printing. One half of the raw print with undirected what lastingly was cut off and overiden under the action of ultraviolet radiation. The second half of the print was printed on the tape, passing through a set of magnets, resulting in the X-axis and Y plates oriented parallel to the tape. After completion of the alignment plates paint was overiden under the action of ultraviolet radiation. Change the color of all three samples with glitter at an angle of 10° was analyzed using spectroradiometry of Zeis. Schedule changes color a*b* presented on Fig.7. Line 701 corresponds to a printing ink containing undirected plate. Line 702 color change corresponds to the alignment in the form of a sheet of magnetic Golden-green plates, oriented in a dynamic magnetic field. Curve 703 corresponds to the substrate of polyester coated in vacuum coating with Golden-green interference. The reflected brightness of the same samples was measured by spectrophotometer SF600+. Graphics reflected the brightness Y is represented on Fig.

The present invention provides a highly reflective, abrasion-resistant product, printed on a wide substrate moving at high speed printing ink containing magnetic plate, with subsequent exposure to the dynamic magnetic field of such a configuration, in which the plates are oriented in printing ink two main axes X and Y parallel to the surface is oblozhki, providing a brightness like the pop-up pigments". This highly reflective, abrasion-resistant product can be part of a protected document containing distinctive protective signs, printed in accordance with the method according to the present invention, and the X and Y axes of the plates or elements of a plate shape parallel to the surface of printing ink, which increases color saturation and dynamic colour area coverage.

In addition, the present invention allows and suggests the formation of a highly reflective layer of the magnetic plates in the layer of printing ink by exposure to a lot of records dynamic magnetic field, which causes the plate to rotate at angles less than 90° in the plane of the substrate as long as they will not form a stable structure that is similar to the sheet.

Another variant of implementation of the present invention shown in Fig.9, where the location of the rollers provides essentially the same effect as if the linear position of the magnet along the feed direction, as shown in figure 5. However, the use of rollers, shown in figure 9, provides a more compact device for implementing the present invention. In this embodiment of the invention, the feed direction is saved, it is the direction along which the tape moves over the alikum, and the magnets effectively placed along the feed direction in a similar manner. Figure 9 shows two wheels 902 and 904 that are installed on the shaft and rotatable with the shaft with the magnets that are located at a distance "d" from each other. Wheel 902 and 904 attached to the shaft locking screws for simultaneous rotation of the magnetic wheel with the shaft. The magnets are staggered, as in figure 5. The tape is supported by supporting rollers, which are adjacent to these two wheels 902 and 904, is located above the wheels and is moved in the feed direction, with no contact with the magnets. The tape is supported by supporting rollers mounted on the shaft bearings of a nonmagnetic material. In a preferred embodiment of the invention, the tape can be moved in the feed direction, while the magnetic wheel 902 and 904 can rotate in the opposite direction, counterclockwise to increase the number of turns per minute produced by the plates.

1. How to align the set of oriented non-spherical plates supported by the longitudinal tape, including:
a) providing the tape with a coating containing non-spherical plates, oriented in a magnetic field;
b) providing first and third magnets with the first sides of the path of feed of the tape and ensuring Vtorov the magnet between the first and third magnets with the second opposite sides of the path of feed of the tape, the first and third magnets have the same polarity, and the second magnet has a polarity opposite to the polarity of the first and third magnets, so that the first magnetic field, covering the specified flow path exists between the first and second magnets, and a second magnetic field, covering the specified flow path exists between the second and third magnets, and the magnets are placed so that many non-spherical plates, oriented by a magnetic field moving along the path of feed of the tape, made the first turn with the passage of the second magnet during the relative movement of the tape and magnets; and
C) relative displacement at least of the tape supporting plate, or magnets, forming two pairs of complementary two attracting magnets.

2. The method according to claim 1, in which step (C) includes moving the tape along a feed path, the flow path is defined by a line.

3. The method according to claim 1, in which step (C) includes moving the magnet along a specified path of submission.

4. The method according to claim 1, in which step (C) includes moving the plates and magnets along a specified path of submission.

5. The method according to claim 2, in which the first magnetic field and second magnetic field respectively define first and second magnetic force lines, which are essentially parallel to the tape, p and the first magnetic lines of force cross the tape at the first angle relative to the path of feed, and the second magnetic lines of force cross the tape under a second angle relative to the path of feed, and the first and second magnetic force lines are not parallel and non-orthogonal to the feed direction of the tape.

6. The method according to claim 1, wherein the step of providing first, second and third magnets also includes providing at least a fourth magnet, placed on the same side of the feed path, and a second magnet, with the third magnetic field between the third and fourth magnets crosses the flow path, and the fourth magnet has the same polarity as the polarity of the second magnet and the opposite polarity of the third magnet, so as to create magnetic lines of force crossing the path of feed of the tape, while the magnets are placed so that many non-spherical plates, oriented in a magnetic field, moving along the feed path, made another turn with the passage of the third magnet when moving tape or magnets.

7. The method according to claim 1, in which the first and third magnets mounted in the first made with the possibility of rotation of the wheel or supported them, while the second magnet is mounted in the second made with the possibility of rotation of the wheel or is supported by them, and a flow path corresponds to the region between the first and second wheels.

8. The method according to claim 2, in which the first magnetic the field exists between the first and second magnets, the second magnetic field exists between the second and third magnets, while the first and second magnetic field across the flow path and the direction of movement of the tape.

9. The method according to claim 2, wherein the plates have a size of from 2 to 100 microns.

10. The method according to claim 9, in which the size of the plates varies by not more than 20%.

11. The method according to claim 10, in which the plates have a predetermined size and shape.

12. The method according to claim 2, in which the first, second, and third magnets are permanent magnets.

13. How to align the set of oriented non-spherical plates supported by the longitudinal tape, including:
a) providing the tape with a coating containing non-spherical plates, oriented in a magnetic field along the path of feed of the tape;
b) providing a first set of magnets on one side of the feed path and providing a second set of magnets with opposite sides of the path of feed, with the first set and second set of magnets are staggered so that the magnets were not directly opposite each other along the feed path, the first set of magnets and the second set of magnets is located near the path of feed in different places and form many pairs of magnets with opposite polarity facing the feed path so that each pair of magnets is ot imagepanel polarity, providing a magnetic field that traverses the flow path, and the magnets are placed so that many plates, oriented non-spherical magnetic field moving along the feed path, made of multiple turns, when they are magnets along the tape, and
C) relative displacement at least of the tape supporting plate, or magnets, forming a pair of complementary two attracting magnets.

14. The method according to item 13, in which adjacent pairs of magnets have a common magnet.



 

Same patents:

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