JP5874976B2 - Paper formed with different fibers for each region and method for producing the same - Google Patents

Description

  The present invention relates to a sheet formed of different fibers for different regions on the same plane of the sheet, and a method for manufacturing the sheet.

  Although the paper is used for various purposes, various ideas such as convenience, designability, and functionality are made according to the usage purpose.

  For example, a papermaking machine is disclosed that forms striped paper using different raw materials or different color raw materials in the width direction of the paper. This is because a plurality of partition plates are provided in the width direction of the papermaking band so as to be separated from the paper above the papermaking belt, so that the slurry-like raw material supplied from the raw material supply tank is separated between the papermaking belts. The nearby ones are quickly dehydrated and transported in the form of a sheet without moving in the width direction of the paper, and the ones away from the papermaking belt are settled and then dehydrated and conveyed become. Thereby, the density of the slurry-like raw material in the vicinity of the papermaking belt can be made uniform. In addition, it is possible to supply slurry-like raw materials having different colors and materials between the partition plates, and it is possible to obtain a sheet that is integrated with vertical stripes having different colors and materials in the width direction of the paper. (For example, see Patent Document 1).

  The form is a certificate that proves the status, rights, and qualifications including securities such as banknotes, stamps, stamps, stock certificates, bonds, gift certificates or ID cards, passports, registration certificates, admission tickets, passports, immigration cards. The paper used in this way has been devised in various ways so that it cannot be easily counterfeited.

  Techniques for preventing counterfeiting in the form of being laminated on a part of paper include forming a printing layer on a substrate by intaglio printing or offset printing in which a fluorescent material or optical material is included in ink, or holograms, etc. The technique which provides functionality by sticking metal foil etc. to a substrate is mentioned.

  On the other hand, techniques for applying a forgery prevention measure on the paper itself or in the paper itself include watermarks, threads, mixed paper, and multilayer paper.

  As a technique for applying a forgery prevention measure to the sheet itself, a sheet having a transparent region is disclosed. One of them is anti-counterfeiting paper in which a transparent polymer resin film with a certain width and slit in a straight line (thread) is made into a paper layer and partially exposed on the front and back of the paper. (For example, refer to Patent Document 2).

  As paper with other transparent areas, a non-woven fabric impregnated with a clearing agent to form a transparent part is used as an intermediate layer, and the upper and lower layers are made of paper. Multi-layer paper with exposed parts (for example, see Patent Document 3).

  In addition, a microfiber is disclosed as a sheet having transparency. This is a fine fiber obtained by dehydrating an aqueous suspension containing fine fibrous cellulose by filtration on a porous substrate to form a sheet containing moisture, and heating and evaporating the sheet containing moisture. (For example, refer to Patent Document 4).

WO2009 / 072419 Japanese Patent No. 4161417 JP 2009-013531 A JP 2010-168716 A

  The technique described in Patent Document 1 can produce a sheet formed of different fibers for each different area of the sheet, but transports the papermaking zone (on the wire) so as to be divided in the width direction. Since the region is divided using a partition plate extending in the direction, the positions and shapes of the different fibers depend on the paper making direction.

  Further, since different areas on the paper depend on the paper making direction, it has not been possible to produce a paper having a plurality of different areas formed of different fibers at a desired position.

  The technique described in Patent Document 2 has a transparent area (transparent film) in part as a measure for preventing counterfeiting of paper, but the adhesive is used because of the poor adhesion between transparent film and paper. There was a problem of delamination. Since printing and surface processing with water-based materials are difficult for films, printing and surface processing methods were also limited. In addition, since a transparent film having a certain width and slit (thread) is used, it also depends on the paper making direction, and the transparent region cannot be formed at a desired position and shape. Furthermore, the transparent part of the film has uniform optical characteristics (light transmission), and there is no individual difference due to formation like a substrate made of paper or fiber, so it can be forged by film sticking or printing with transparent ink. There was a possibility.

  The technique described in Patent Document 3 is to solve a part of the problem of Patent Document 2 because the transparent portion is made of a base material (nonwoven fabric) made of fibers, but the upper and lower layers are paper layers and the intermediate layer is a nonwoven fabric. Therefore, there is a problem of delamination, and there is a possibility of peeling and forgery.

  The present invention aims to solve the above-mentioned problems, and is a paper having a plurality of different regions formed of different fibers on the same plane at a desired position and shape without depending on the paper making direction. Furthermore, the present invention provides a paper having a paper-like transparent window in a single-layer paper instead of the transparent window in the conventional multilayer paper, and a method for producing the paper.

  The paper in the present invention has a first region including at least a first fiber, and a second region including at least a second fiber different from the first fiber at a desired position in the first region. It is characterized by that.

  The paper in the present invention is characterized in that either the first fiber or the second fiber is a cellulose microfiber, and the region composed of the cellulose microfiber is translucent or transparent.

  The paper in the present invention can be used as anti-counterfeit paper.

  The present invention has a first region including at least a first fiber, and a second region including at least a second fiber different from the first fiber at a desired position in the first region. And a first fiber for forming a first region on a wire of a paper machine, and an opening having a desired shape at a desired position in the first region. And a step of supplying a second fiber for forming a second region in the opening.

  The paper manufacturing method according to the present invention is characterized in that the step of forming the opening is a means using an opening forming device or a means using a wire provided with a protrusion.

  Since the paper has a plurality of different regions formed of different fibers at a desired position without depending on the paper making direction, it is also useful as an anti-counterfeit effect.

  By using fibers with affinity, bonds between different fibers (between areas) are strong because they are bonded by entanglement of fibers and hydrogen bonds, chemical bonds, etc. of fibers as well as bonds of the same fibers. Will not peel off. Further, since different fibers are not formed in a multilayer structure but on the same plane, delamination does not occur.

  Since all the regions are formed from fibers, for example, even if it is a transparent region, it has a unique texture (texture, touch, etc.).

It is a figure which shows the top view of the paper in embodiment of this invention. It is a figure which shows the preparation methods of the paper in embodiment of this invention. It is a figure which shows the preparation methods of the paper in embodiment of this invention. It is a figure which shows the top view of the paper in Example 1 of this invention. It is a figure which shows the top view of the paper in Example 2 of this invention.

  DESCRIPTION OF EMBODIMENTS Embodiments for carrying out the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments described below, and includes various other embodiments within the scope of the technical idea described in the scope of claims.

  First, the configuration of the paper will be described.

  FIG. 1 is a plan view of a sheet according to the present invention. The paper (1) in the present invention has a region A (2) having at least a first fiber and a region B (3) made of at least a second fiber in the region A (2). The region B (3) is provided in a desired shape at a desired position in the region A (2), and the first fiber forming the region A (2) and the second fiber forming the region B (3). The fibers are different fibers.

  Region A (2) may have fibers other than the first fibers, and region B (3) may also have fibers other than the second fibers. In the present invention, if both regions are formed with two or more types of fibers, even if the regions A (2) and B (3) have even one type of fiber, Region A (2) and region B (3) are said to be formed of different fibers. For example, if region A (2) consists of first and third fibers and region B (3) consists of second and third fibers, both regions have third fibers. However, since it has the 1st fiber and the 2nd fiber in each other, field A (2) and field B (3) will be formed with a different fiber. In addition, regarding the region B (3) provided at a desired position in the region A (2), the region A (2) and the region B (3) do not have an overlapping region, and are the same to the last. It is a state that exists as different areas on a plane. Therefore, it is possible that the region A (2) is composed only of the first fibers and the region B (3) is composed only of the second fibers.

  Furthermore, it is not necessary to be limited to two regions each composed of two different types of fibers, and may have three or more regions such as a region C (4) composed of a third fiber. Also in this case, the region C (4) is provided in a desired shape at a desired position different from the region A (2) and the region B (3). The third fiber forming the region C (4) is a fiber different from the first fiber and the second fiber.

  Different fibers mentioned here are all fibers other than the same fibers, such as fibers with different raw materials, fibers with different functions due to coloring or chemical modification, fibers with different fiber length distribution, fibers with different fiber width distribution, etc. Use different fibers.

  Further, the shape of the region made of each fiber may be a region having a symbol shape having meaningful information as shown in FIG. 1A, and has no meaningful information as shown in FIG. Alternatively, a horizontal stripe-shaped region orthogonal to the paper making direction may be used.

  The fibers forming the paper (1) in the present invention are wood fibers, non-wood fibers, synthetic fibers and the like, and are not particularly limited. However, since different fibers are bonded by entanglement or chemical bonding between the fibers, it is preferable to use fibers having affinity.

  Bonding between different fibers (between regions) is performed by entanglement of fibers and hydrogen bonding or chemical bonding between fibers in the same manner as bonding between the same fibers. Synthetic fibers include heat fusion bonding with heat fusible fibers and binder fibers.

  Wood fibers are chemical pulps such as KP and SP made from various kinds of wood, mechanical pulps such as GP, TMP, and CTMP, recycled paper, etc. Non-wood fibers are kenaf, hemp, rice, wheat, bagasse, abaca Plant fibers such as cotton, mitsumata and bamboo can be selected and used as appropriate. Synthetic fibers can be used by appropriately selecting fibers such as rayon, polyolefin, polyvinyl alcohol, polyethylene terephthalate, etc., but when used with wood fibers or non-wood fibers, they are compatible with hydrophilic wood fibers and non-wood fibers. It is desirable that there is sex.

  Wood fibers and non-wood fibers can be used after promoting fibrillation of the fibers by beating treatment. In order to further strengthen the entanglement between the fibers, it is better to perform appropriate fibrillation by beating treatment.

  These fibers are dispersed in water to prepare a fiber suspension. This is called paper. To this, internal additives such as a dispersant, a sizing agent, a fixing agent, a paper strength agent, a water-soluble polymer, a filler, a pigment, and a coloring material may be appropriately added.

  Moreover, a cellulose microfiber can also be used for at least one kind of fiber. In this case, since the area | region which consists of a cellulose microfiber has few space | gap between fibers and scattering of light is suppressed, it becomes translucent or transparent.

  Cellulose microfibers in the present invention are fibers mainly composed of cellulose, particularly those using plant-derived natural cellulose as a raw material, and those fibrillated into fine cellulose fibers having a fiber width of less than 2 nm to 10 μm. Say.

  The term “defibration” as used herein refers to unraveling cellulosic fibers up to several micro or nanofibrils. Usually, the cellulose fiber obtained from a plant is an aggregate of cellulose nanofibrils composed of 30 to 50 cellulose molecules and having a fiber width of about 2 to 5 nm. Cellulose microfibrils are firmly bonded by innumerable hydrogen bonds, but can be broken into several units of cellulose micro or nanofibrils while remaining in a fibrous state by applying physical or chemical treatment.

  As a method of defibration, in the physical method, there are a method of microfibrillation by a mechanical shearing force by a high-pressure homogenizer or a grinder, a method of atomization by adding an organic solvent to mechanical grinding by a dry ball mill, etc. . In addition, as a method by chemical treatment, there are a method of removing a non-crystalline portion of cellulose fibers by a sulfuric acid treatment, a method of introducing a carboxyl group only on the surface of crystalline cellulose microfibrils by an oxidation treatment, and the like. These methods are all known methods, and the defibration performed for preparing the paper in the present invention is also performed by a known method.

  When the fiber width of the cellulose fiber is 10 μm or more, it becomes the same order as 10 to 30 μm, which is the fiber width of a general pulp fiber, and characteristics specific to microfibers cannot be obtained. Therefore, the term “microfiber” as used herein refers to a fiber having a cellulose nanofibril unit of about 2 nm to less than 10 μm, particularly preferably 2 nm to less than 1 μm, and more preferably 2 nm to less than 100 nm. However, depending on the method of defibration, even if the average fiber width is less than 10 μm, some fibers with a fiber width of 10 μm or more may be included, but this is within the scope of the present invention, and the average fiber width is less than 10 μm. That's fine.

  Cellulose microfibers are mainly composed of fibers made of cellulose, but the fibers made of cellulose are not particularly limited, and are made of chemical pulps such as KP and SP made from various kinds of wood, GP, and TMP. In addition, mechanical pulp such as CTMP and pulp such as used paper recycled pulp can be appropriately selected and used. Powdered cellulose obtained by pulverizing them, microcrystalline cellulose purified by chemical treatment, and the like can also be used. Further, non-wood such as kenaf, hemp, rice, wheat, bagasse, abaca, cotton, mitsumata, bamboo and the like can also be used.

  Cellulose microfibers are dispersed in water to prepare a cellulose microfiber dispersion. It is possible to add to this powder, fine particles, or an aqueous liquid that does not significantly inhibit the dispersion state of cellulose microfibers, such as a water-soluble polymer, such as a dispersant, a sizing agent, and a fixing agent.

  Moreover, in order to make it translucent or transparent, the region is formed only by cellulose microfibers, but even when other fibers are contained within a range not inhibiting the dispersion state of cellulose microfibers. It is within the scope of the present invention.

  In addition, the cellulose fine fiber dispersion needs to have a concentration such that the fibrillated microfibers do not immediately recombine by hydrogen bonding, and is preferably used at a solid content concentration of about 0.1 to 3%. . However, if the microfibers can be re-separated by vigorous stirring of the dispersion or addition of a dispersing agent, there is no problem even if it is about 3 to 35%.

  This is because, when the solid content concentration is 35% or higher, re-defining treatment may be necessary because recombination of the microfibers cannot be suppressed only by adding stirring or a dispersing agent. On the contrary, if the solid content concentration is as low as 0.1% or less, there is a possibility of causing poor drying due to excessive moisture in the dehydration and drying stages during paper preparation. However, there is no particular limitation as long as these problems can be avoided by other means.

  The paper (1) having at least a region composed of the first fibers and a region composed of the second fibers of the present invention can be combined with other sheet layers and used as a multilayer paper. The other sheet layer is made of paper, non-woven fabric, film or the like made of wood fiber or non-wood fiber, and is not particularly limited.

  As described above, bonds between different fibers (between regions) are bonded by entanglement of fibers and hydrogen bonding or chemical bonding between fibers. Paper prepared by simply bonding different fibers with an adhesive or the like is easy to peel off and forge, whereas the paper (1) of the present invention is formed by firmly bonding different fibers. Therefore, forgery is very difficult, and it is useful as anti-counterfeit paper.

  When one region is formed of cellulose microfibers, the region becomes translucent and has an effect as a transparent window. This transparent window has a texture that does not exist in the film, and also has a unique texture such as a unique feel of fibers that do not exist in the film, so it is difficult to forge by film sticking or printing. .

  Conventionally, there has been a paper-quality (nonwoven fabric) transparent window in multilayer paper, but there is no paper having a paper-quality transparent window in single-layer paper. In the case of multi-layer paper, it was possible to forge, such as pasting after peeling, whereas in the case of single-layer paper, it is difficult to peel off, and the fibers are firmly bonded, so forgery It is very difficult.

  In addition, it is possible to perform coating or printing on the paper (1) in the present invention, and when there is a transparent window region made of cellulose microfibers, coating and printing can also be performed on this region. It is. In the case of a transparent part using a transparent film, it is difficult to apply and print an aqueous material. However, in the case of a transparent window made of cellulose microfiber, printing should be performed so as to cover the transparent window area and other areas. It can also be used to prevent tampering by using it like a tally according to the printed design.

  Next, a method for producing a sheet will be described.

  FIG. 2 shows an example of a method for producing a sheet having an area with a pattern shape as shown in FIG. As shown to Fig.2 (a), the 1st fiber which forms area | region A (2) from a 1st paper supply tank (not shown) is supplied on the wire (5) of a paper machine, and a wire ( 5) Opening (6) is formed when forming the paper layer on top.

  As a method of forming the opening (6), there is a method using an opening forming device (7) using air pressure or liquid injection. In the method using the opening forming device (7), the opening (6) is formed in the paper layer made of the first fibers by air pressure or liquid injection from the opening forming device (7) installed on the upper portion of the wire portion. .

  Next, as shown in FIG. 2 (b), a movable second paper supply tank (8) or paper injection device is provided on the upper part of the wire part downstream of the opening forming device (7) installation position. (9) is installed, and the second fiber is poured into the opening (6) from the second paper supply tank (8) or injected by the paper injection device (9). The second paper supply tank (8) or the paper injection device (9) may not be movable, but by making it movable, the second fiber can be used according to the dehydrated state of the first fiber. You can adjust the insertion timing.

  A timer and a control device are attached to the opening forming device (7), the second paper supply tank (8), and the paper injection device (9), and the timing of injection and insertion is set to automatically Thus, the opening and the insertion of the second fiber can be performed. Further, an optical opening detection sensor (not shown) is attached between the opening forming device (7) and the second paper supply tank (8) or the paper injection device (9), and the opening (6). The position detection signal is sent to the control device, and the insertion timing of the stock from the second stock supply tank (8) or the stock injection device (9) is controlled to match the position of the opening (6). The second fiber can also be inserted.

  Moreover, it is also possible to perform the opening formation and the paper material injection insertion from the same nozzle by using an injection nozzle having two injection ports. First, air pressure or liquid ejection for forming the opening is performed from the first ejection port, and the paper stock is ejected from the second ejection port after a certain timing. In this case, it is assumed that the opening formation and paper injection device installed at the upper part of the wire portion operates in accordance with the speed of the wire.

  Next, as shown in FIG. 2 (c), in the process of dehydration, the fibers are bonded by entanglement or hydrogen bonding between the fibers in the first fiber and the second fiber, and FIG. 2 (d). As shown in FIG. 4, a sheet (1) having a region A (2) made of the first fibers and a region B (3) made of the second fibers on the same plane is produced.

  Thereafter, it is further dehydrated with a press roll, dried, calendered, and wound up with a reel device. In the pressing and drying process, the bond between the fibers becomes stronger.

  FIG. 3 shows another example of a method for producing a sheet having an area having a pattern shape as shown in FIG. As shown in FIG. 3 (a), a protrusion (10) is formed in advance on the wire (5) of the paper machine, and a first paper supply tank (illustrated) is formed on the wire (5) of the paper machine. The first fiber is supplied from (none).

  At that time, as shown in FIG. 3B, the paper material of the first fiber avoids the protruding portion (10) to form the paper layer, thereby forming the opening (6) in the paper layer. The A movable second stock supply tank (8) or a stock injection device (9) is installed above the wire part, and the second fiber is put into the second stock supply tank in the opening (6). Pour from (8) or eject by a paper material ejecting device (9) and insert. The second paper supply tank (8) or the paper injection device (9) may not be movable, but by making it movable, the second fiber can be used according to the dehydrated state of the first fiber. You can adjust the insertion timing.

  A second fiber is automatically inserted at predetermined intervals by attaching a timer and a control device to the second paper supply tank (8) or the paper injection device (9) and setting the insertion timing. be able to. In addition, an optical opening detection sensor (not shown) is attached upstream of the second paper supply tank (8) or the paper injection device (9), and a position detection signal of the opening (6) is sent. The second fiber is adjusted to the position of the opening (6) by controlling the insertion timing of the paper from the second paper supply tank (8) or the paper injection device (9) by sending it to the control device. Can also be inserted.

  Next, as shown in FIG. 3 (c), in the process of dehydration, the fibers are bonded by entanglement or hydrogen bonding between the fibers in the first fiber and the second fiber, and FIG. 3 (d). As shown in FIG. 4, a sheet (1) having a region A (2) made of the first fibers and a region B (3) made of the second fibers on the same plane is produced. However, in the case of this method, the region B (3) made of the second fiber is formed on the wire protruding portion, and therefore the thickness of the protruding portion is larger than the region A (2) made of the first fiber. getting thin.

  The method of applying the opening (6) to the paper layer is a method that can form the opening (6) in the paper layer on the wire and then form another paper layer in the opening (6). However, it is not particularly limited to these methods.

  A first embodiment of the present invention will be described with reference to FIG. Example 1 is an example of a sheet having a region composed of a first fiber and a region composed of a second fiber on the same plane. Cellulose microfibers are obtained by using cellulose microfibers as the second fibers. The example which produced the translucent area | region by and produced the paper which has a translucent window is shown.

  The first fiber forming the region A (2-1) uses wood pulp (LBKP), and the second fiber forming the region B (3-1) is cellulose microfiber “Serisch 100G (trade name)” (Daicel Chemical Industries, Ltd.) was used.

  As a paper manufacturing method, the paper was manufactured by forming the opening (6) with the opening forming device (7) described in FIG. First, the fiber suspension of the wood pulp (LBKP) which forms the area A (2-1) on the wire of the paper machine is supplied from the first paper supply tank, and the fluidity of the paper is lowered. Then, the opening (6) was formed in the paper layer by water jetting by the opening forming device (7) installed on the upper part of the wire. A cellulose fine fiber suspension for forming the region B (3-1) was injected and inserted into the opening (6) by the paper material injection device (9). The fiber suspension of cellulose microfibers was inserted at a concentration at which the fluidity was low so as not to flow out in a large amount in the region A (2-1).

  Then, the water | moisture content of the paper stock was dehydrated by the squeezing box installed in the lower part of the wire, and the wood fiber and the cellulose microfiber were joined by entanglement or hydrogen bonding. By further dehydrating with a press roll, drying, and calendering, the bond between fibers was further strengthened, and the region B (3-1) composed of cellulose fine fibers became translucent.

  FIG. 4A shows a plan view of the paper (1-1) produced by the above production procedure. The paper (1-1) has a region (2-1) made of wood pulp (LBKP) and a region (3-1) made of cellulose microfibers on the same plane, and is made of cellulose microfibers. The region (3-1) became a translucent window having a unique texture and optical characteristics different from those of the transparent film.

  FIG. 4B shows a printed matter using the paper shown in FIG. The example of a gift certificate is shown as a printed matter on the paper (1-1) in the first embodiment. The gift certificate is produced by giving other information to the paper produced and cut by the method described above. As other information, the face value, number, and design of the gift certificate were used, and the face value and design were printed by the offset printing method, and the number was printed by the ink jet printing method.

  Regarding the printing of numbers, the same number printing was performed on the upper left and lower left of the paper, but the lower left one is a semi-transparent window made of cellulose microfiber (3-1) ) Was printed. As described above, in the case of the transparent window made of the conventional plastic, it is difficult to perform water-based printing. On the other hand, it is possible to perform water-based printing with good print quality on the translucent window provided with the paper of the present invention. It is possible to produce a printed matter that is excellent in forgery effect.

  A second embodiment of the present invention will be described with reference to FIG. Example 2 is an example of a sheet having a region composed of a first fiber, a region composed of a second fiber, and a region composed of a third fiber on the same plane. The example which produced the paper (1-2) which uses a fiber and uses a colored fiber for a 3rd fiber and has a white, translucent, and colored area | region is shown.

  The first fiber forming the region A (2-2) uses wood pulp (LBKP), and the second fiber forming the region B (3-2) is cellulose microfiber “Serisch 100G (trade name) ) "(Manufactured by Daicel Chemical Industries, Ltd.), and the third fiber forming the region C (4-2) was a wood pulp (LBKP) dyed yellow.

  As a method for producing the paper, the method described in FIG. 3 was prepared by previously forming the protrusion (10) on the wire of the paper machine and supplying the paper stock. First, a wood-like pulp (LBKP) that forms a pattern-like protrusion on the paper machine wire in advance and forms the region A (2-2) from the first stock supply tank on the paper machine wire. Of fiber suspension was fed. At that time, the fiber suspension of the wood pulp (LBKP) avoids the protruding portion to form the paper layer, thereby forming the opening (6) in the paper layer.

  Cellulose microfiber suspension that forms region B (3-2) at the opening when the fluidity of the fiber suspension of wood pulp (LBKP) is reduced and the opening (6) is formed Then, a fiber suspension of wood pulp (LBKP) dyed yellow to form region C (4-2) was injected and inserted. The fiber suspension of cellulose microfibers and colored wood pulp was inserted at a concentration that would result in a low fluidity so as not to flow out in a large amount in the region A (2-2).

  After that, the paper stock was dehydrated by a squeezing box installed at the lower part of the wire, and wood fibers, cellulose microfibers, and colored wood fibers were bonded by entanglement or hydrogen bonding. By further dehydrating with a press roll, drying, and calendering, the bond between fibers became stronger, and the region B (3-2) made of cellulose microfibers became translucent.

  FIG. 5A shows a plan view of the paper (1-2) produced by the above production procedure. The paper (1-2) was dyed yellow on the same plane, a white area (2-2) made of wood pulp (LBKP), a translucent area (3-2) made of cellulose microfibers, and the like. A paper (1-2) having a yellow region (4-2) made of wood pulp (LBKP) and having three color regions of white, translucent, and yellow was produced.

1, 1-1, 1-2 Paper 2, 2-1, 2-2 Region A composed of first fibers
3, 3-1, 3-2 Region B composed of second fibers
4,4-2 Region C composed of third fibers
5 Wire 6 Opening 7 Opening Former 8 Second Paper Supply Tank 9 Paper Injection Device 10 Projection

Claims (4)

A first region comprising at least a first fiber, at a desired position of said first region, have a second region including at least a different second fibers and the first fibers,
Either the first region or the second region is a translucent or transparent region made of cellulose microfibers .   Use of the paper according to claim 1 as anti-counterfeit paper. A first region comprising at least a first fiber, at a desired position of said first region, have a second region including at least a different second fibers and the first fibers, the first In one of the first region and the second region, a method for producing a paper characterized in that it is a translucent or transparent region made of cellulose microfibers .
Supplying a first fiber for forming the first region on a wire of a paper machine; forming an opening in the first region; and the second in the opening. A method for producing a sheet, comprising at least a step of supplying the second fibers for forming the region. 4. The method for producing a sheet according to claim 3, wherein the step of forming the opening is a means using an opening forming device or a means using a wire provided with a protrusion.

Images