JP2893309B2 - Special paper manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing special paper in which strips are uniformly scattered on the surface of a base paper and which can be suitably used as forgery prevention paper and design paper.

[0002]

2. Description of the Related Art Recently, the accuracy of copying machines has been remarkably improved, and in particular, the spread of color copying machines has facilitated forgery of various securities. To prevent this, various anti-counterfeiting means have been considered, but one of them is to utilize the fact that current copiers cannot reproduce brilliant ones, for example, metallic colors or interference colors. There is something.

[0003]

SUMMARY OF THE INVENTION For example, Japanese Utility Model Application Laid-Open No. 58-1
As proposed in Japanese Patent No. 68754, there is a proposal of a non-copyable paper by a copying machine in which a bright plate such as aluminum foil having a remarkable metal tone is provided on the upper surface of a base paper, and a character pattern is provided on the bright plate surface. . When this is copied, the character pattern applied to the paper surface becomes unreadable because the foil surface is darkened and copied when light is irradiated from the copying machine. This sheet has the advantage that copying itself cannot be performed (the copy cannot be read), but has the disadvantage that the metallic color is emphasized too much because the area of the glittering plate occupying the sheet is so uncomfortable. In addition, there are other problems, such as a complicated paper manufacturing process, which inevitably increases the cost, and difficulty in recovering papermaking fibers from waste paper.

The present inventors have studied to solve these problems, and if a copy is made in a color different from that of the original document even if the original is copied by a color copying machine, it is determined whether or not the original is authentic. Focusing on what can be done, the development of anti-counterfeit paper was promoted, and a patent application was filed as Japanese Patent Application No. 5-11409. The gist of the present application is to provide a forgery-preventing paper in which glittering strips are ubiquitously provided on the surface of the base paper, wherein the strips have a performance capable of adhering to the base paper in the paper making process. Anti-counterfeit paper. This anti-counterfeit paper must be 1 in a given area (small area for uses such as gift certificates).
More than one strip is required to be included in the paper, and the biggest challenge in paper manufacture is how to distribute the strips uniformly on the base paper. An object of the present invention is to provide a method for efficiently producing the above-described forgery prevention paper.

[0005] On the other hand, many design papers in which various small pieces are formed in paper have been proposed in the past. For example,
Japanese Patent No. 23707 discloses that synthetic fibers to which metal powder is adhered are made into paper, and Japanese Patent Application Laid-Open No. Sho 62-125099 discloses that a crushed cottonseed shell is made into a chew.
No. 099 proposes to make colored rice bran into paper, and Japanese Utility Model Laid-Open No. 3-241098 proposes to make a paper obtained by disintegrating waste paper having a water-resistant coating layer into paper. .

[0006] Each of these design papers has a unique design effect, but the strips to be made contaminate the paper machine and the auxiliary equipment, and at the end of paper making, a great deal of removal is required. It requires time and effort, is not suitable for small-lot production, and small pieces mixed into the paper contribute little to the design, and when using expensive pieces, the material cost of the pieces is low. It has problems such as bulking.

On the other hand, Japanese Patent Application Laid-Open No. 55-142793 proposes a method of forming a metal foil or the like on the surface of paper. In this publication, the drawback of a method of sprinkling a metal foil or the like from the air onto a dewatered wet paper web on a papermaking mesh, which has been conventionally performed,
That is, there is a means for solving the problem of worker's health caused by the metal foil or the like scattered in the air, poor workability, and the problem of peeling from the surface of the metal foil when printing the metal foil paper thus manufactured. Are listed. Specifically, when squeezing and dewatering the wet paper on the papermaking net, drying and drying the paper, a dispersion in which the metal foil and the like and the paste are dispersed in water is poured onto the wet paper on the papermaking net, and then A press dewatering and drying method and apparatus are described.

[0008] The present inventors first attempted to study the apparatus described in the above-mentioned JP-A-55-142793 in order to solve the above-mentioned problems. That is, this is a method in which a dispersion liquid in which fine particles and a paste are dispersed in water is poured onto wet paper on a paper machine using the above-described apparatus. However, it has been found that this apparatus cannot solve the above-mentioned problem, and that it causes another problem. The problems are described below. 1) When a dispersion liquid in which fine particles and a paste are dispersed in water is poured on a wet paper, the paper layer of the wet paper is broken and the formation is deteriorated. 2) Dehydration efficiency is reduced due to the effect of the sizing agent, and formation of the press roll is broken. 3) In the method of pouring a dispersion liquid in which the flakes and the sizing agent are dispersed in water, the slivers adhere to and accumulate on the roll surface of the press roll device due to the adhesiveness of the sizing agent, and a large amount of labor is required for the removal. I do. 4) The glue adheres and accumulates on the blanket or the canvas, and it is very difficult to remove it.

Next, the present inventors have studied a method of pouring a dispersion liquid in which only small pieces are dispersed in water with the same apparatus in order to eliminate the adverse effect of the paste. As a result, it was found that the adverse effect of the glue can be eliminated, but the problem of breaking the paper layer of the wet paper cannot be solved at all.

Next, the inventors of the present invention have disclosed Japanese Patent Publication No. 5-65639.
The device proposed in the issue was considered. This apparatus supplies color liquid from a colorant discharge pipe to a dispersion liquid flowing through a flat plate-shaped flow path on a transporting wet paper web to produce a colored patterned paper. The present inventors paid attention to the storage tank and the flat plate-like flow channel for flowing the dispersion liquid of the apparatus, and manufactured and studied a sprinkling apparatus having this configuration.
That is, a method in which this apparatus is installed on a paper net of a fourdrinier paper machine, supplies a water suspension of small pieces into a storage tank at the time of paper production, and overflows onto a flat plate channel. As a result, the small particles are deposited on the bottom of the storage tank, and pulsation occurs when the small particles overflow on the flat plate-like flow path, and sometimes the excessively small particles are supplied, and sometimes the supply is insufficient. However, it was found that this device could not sprinkle evenly small strips.

[0011]

Means for Solving the Problems The present inventors have further studied and completed the present invention. The present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view illustrating an example of a strip sprinkler used in the present invention, and FIG. 2 is a partially enlarged cross-sectional view thereof. The present invention relates to a strip sprinkler comprising a storage tank 1, a stirring blade 2 installed in the storage tank 1, and an inclined plate 3 attached diagonally downward from the end of the storage tank in the traveling direction of the papermaking net W. It is installed on a papermaking net of a papermaking machine, and the aqueous suspension 4 of the fine pieces is supplied into the storage tank, and the aqueous suspension of the fine pieces overflows onto the inclined plate 3 by the rotation of the stirring blades 2. This is a special paper manufacturing method characterized by sprinkling on a stock or a wet paper 5 before forming a paper layer on a net to make paper.

The storage tank 1 is manufactured by an arbitrary method such as manufacturing into a predetermined shape using a plate of wood, metal, synthetic resin or the like, or manufacturing by injection molding into a predetermined shape using a synthetic resin. I do. In addition to the box shape as shown in the figure, any shape such as a round bottom shape or a box with a slanted side surface can be adopted.

A stirring blade 2 is provided in the storage tank 1 to uniformly stir the aqueous suspension of the small pieces supplied to the storage tank. As shown in FIGS. 1 and 2, the water suspension of the small pieces is supplied by installing a supply pipe 6 for the water suspension of the small pieces at the upper portion of the storage tank. Although the supply of the water suspension 4 of the strips is not shown in the figure, a hole may be formed in the side surface of the storage tank, and a supply pipe may be connected to the hole to supply the suspension. A plurality of supply pipes are preferably provided in order to make the dispersion of the strips uniform.

The shape of the blade of the stirring blade 2 can be adopted as long as it has a function of uniformly overflowing the water suspension of the strip supplied to the storage tank on the inclined plate by the rotation of the stirring blade. For example, a shape in which a number of screw-type stirring blades are attached to a shaft of metal or the like, a shape in which a plurality of stirring blades made of a flat elongated plate are attached to the shaft, a plurality of stirring blades made of a bent plate are attached to the shaft. Typical examples include a shape in which a plurality of stirring blades each of which is attached to a shaft, a metal tube attached to a shaft, and a flat elongated plate attached to the metal tube. The shaft 21 is exposed outside the storage tank as shown in FIG.
The motor can be rotated using a motor M or the like whose rotation speed can be changed.

The inventors of the present invention have studied the mounting angle of the stirring blade with respect to the shaft. As a result, as shown in FIG. 3, a metal tube 22 is mounted on the shaft 21, and the metal tube is formed of a flat elongated plate. Among the shapes having a plurality of stirring blades attached, the tip of the stirring blade 2 is the inclined plate 3 of the storage tank.
When the angle of inclination of the stirring blades at the upper position on the side was equal to or close to the angle of attachment of the inclined plate, it was found that the sprinkling uniformity of the strip was most excellent. The reason for this is that, as shown in the figure, when the water suspension of the strip is forcibly overflowed onto the inclined plate 3 by the rotation of the stirring blade 2, is the angle of attachment of the inclined plate 3 equal to the angle of attachment of the stirring blade? Alternatively, in the case of an angle close to this, the water suspension of the small pieces overflows smoothly on the inclined plate side.

The inclined plate 3 is attached obliquely downward from the end of the storage tank in the traveling direction of the papermaking net W. In this way, the aqueous suspension of the strips supplied on the inclined plate is smoothly supplied to the stock or wet paper before the formation of the paper layer on the papermaking net, so that the formation of the paper layer is not deteriorated. The pieces become uniformly ubiquitous near the surface of the paper layer. The inclined plate preferably has a flat surface so that the strip suspension flows down uniformly, and is made of a plate of wood, metal, plastic or the like. Although not shown in FIG. 1, weirs may be provided at both ends parallel to the flow direction of the papermaking net so that the water suspension of the strips does not spread outside.

The storage tank 1 has a front chamber 11 as illustrated in FIG.
And the rear chamber 12 is divided into a structure in which the fine particle suspension supplied to the front chamber 11 is stirred and homogenized and then guided to the rear chamber 12. It can also be structured. According to the results of the study by the present inventors, it was found that the two-chambered structure had better strip uniformity. In order to improve the dispersion of the small pieces supplied to the front chamber, stirring blades can be provided, and any of the above-mentioned shapes can be used. 1 and 2 show an example in which the suspension is guided from the lower part of the front chamber 11 to the rear chamber 12, but the suspension is guided to the rear chamber by overflowing a partition plate near the center although not shown. The shape of the storage tank having the structure can be adopted as another example.

The strip sprinkler having the above-mentioned structure is installed on a paper net of a fourdrinier paper machine by, for example, hanging from a ceiling, and before forming a paper layer of a stock suspension on the paper net (papermaking). Sprinkle the aqueous suspension of the strips on stock or wet paper 5 (after water has run out and a paper layer has been formed) 5 before draining on the net. FIG. 1 shows a state of sprinkling before forming the paper layer. Sprinkling fine particles on the wet paper after forming the paper layer increases the tendency of the formation to deteriorate, and sprinkling before forming the paper layer hardly deteriorates the formation, but the formulation of the stock and the required properties of the paper The position at which the strip is sprinkled is arbitrarily selected.

An apron 7 of a film or sheet made of a flexible material such as polyvinyl chloride resin or polyester resin can be attached to the tip of the inclined plate 3. Thereby, the effect of preventing the deterioration of the paper formation when the water suspension of the small pieces is sprinkled can be further enhanced.

The flakes used in the present invention include colored fibers, fibers to which metal powder is attached, flaked bark, screen cake,
To produce design paper as conventionally proposed, such as crushed cottonseed husk, rice bran, crushed rice hull, flaked printing paper, flaked metal foil, flaked metallized film, etc. Any strip can be used. Also, when the purpose is to manufacture anti-counterfeit paper, the fiber to which the fluorescent dye is attached, the sheet to which the fluorescent dye is attached is fragmented, the fiber to which the fluorescent pigment is attached, and the fluorescent pigment is attached. A sheet obtained by shredding a sheet, which was previously proposed by the present inventors in Japanese Patent Application No. Hei.
For example, a strip described in JP-A-11409 for the purpose of forgery prevention paper, that is, a strip having glitter can be used.

First, the special paper of the present invention is a softwood bleached kraft pulp (NBKP) or a hardwood bleached kraft pulp (LBK).
P), softwood bleached sulphite pulp (NBSP), thermomechanical pulp (TMP), and other papermaking pulp, with a dry paper strength enhancer, wet paper strength enhancer, sizing agent, fixing agent, retention improver, Papermaking auxiliary materials such as a drainage improver, an antifoaming agent, a dye, a coloring pigment, and a fluorescent agent are appropriately used in combination, and usually have a freeness of 550 to 250 ml. S. F. Paper making using a fourdrinier paper machine.

Next, the water suspension of the strips is sprinkled using the strip sprinkler as described above. The small pieces are previously filled with water in a tank or the like, mixed with the small pieces, gently stirred by a stirrer, and guided to a sprinkler using a flow pump or the like.
At this time, in order to promote uniform dispersion of the strips, a water and a tackifier such as polyethylene oxide and polyethylene oxide may be appropriately used.

Next, the wet paper is dewatered and dried according to a conventional method, but the paper is made transparent during the paper making process, and the paper is coated with starch, polyvinyl alcohol, various surface sizes, etc. by a size press or the like. Is also possible. Further, if necessary, a machine calendering treatment or a super calendering treatment is performed to appropriately improve the surface smoothness.

[0024]

EXAMPLE 1 This example is an example of manufacturing a design paper. 150 ml of bleached softwood kraft pulp (NBKP) and 390 kg of hardwood bleached kraft pulp (LBKP) S. F. Rosin size agent (trade name: SPN700,
7.2 kg of starch (manufactured by Arakawa Forestry Chemical Co., Ltd.), 3 kg of starch (trade name: AMICOL, manufactured by Nissen Chemical Co., Ltd.), fixing agent (sulfuric acid band)
30kg, dye (trade name "LEVACELL FAST"
YELLOW GFN (L), manufactured by BAYER) is 0.02% based on pulp and dye (trade name "LEVACELL").
FAST BLACK G ", manufactured by BAYER, Inc.) and pulp was added at 0.002% to prepare a stock. Thickness 25
Metallic aluminum is vacuum-deposited on a PVA film having a hot water dissolution temperature of 80 ° C. of 500 μm in a thickness of 500 angstrom, and a yellow dye (trade name: Oleosol First Yellow, manufactured by Sumitomo Chemical Co., Ltd.) is applied to an alkali-soluble nitrocellulose resin 100 on the deposition surface. The coating was added at a thickness of 3 μm (dry thickness) with 15 parts by weight added to the parts by weight. Then, a circular strip having a diameter of 3 mm was manufactured using a punching machine. When making a base paper having a basis weight of 100 g / m ² using a Fourdrinier paper machine, the above-mentioned strips were sprinkled on wet paper immediately after draining using the sprinkler shown in FIG. 1, and then a dandy roll was used. After that, the blades were given a transparent pattern, and thereafter dehydrated according to a conventional method, and dried using a multi-cylinder cylinder dryer. The obtained design paper was ubiquitous on the paper surface with an average of 1100 strips having metallic luster per 1 m ² being uniformly distributed, and had excellent design properties.

Embodiment 2 This embodiment is an example of manufacturing forgery prevention paper. Basis weight 50g
/ M ² size paper on both sides using a paint consisting of 100 parts by weight of mica powder pearl pigment having a particle size of 40 μm and titanium oxide coverage of 28% and 200 parts by weight of polyvinyl alcohol, and using an air knife coater, 7 g per side. / M ² . A 3 mm × 4 mm rectangular strip was then produced using a punching machine. 20 parts by weight of NBKP, LBK
P80 parts by weight to 350 ml C.I. S. F. 10 parts by weight of clay, 0.3 parts by weight of a paper strength agent (trade name "Polystron 191", manufactured by Arakawa Chemical Industry Co., Ltd.), a sizing agent (trade name "Size Pine E", Arakawa Chemical Industry Co., Ltd.
1.0 parts by weight) and an appropriate amount of a sulfuric acid band were added to prepare a stock. When the base paper having a basis weight of 110 g / m ² was formed using a Fourdrinier paper machine, the strips were sprinkled on the stock immediately after slicing using the sprinkler shown in FIG. Thereafter, dehydration was carried out according to a conventional method, and drying was carried out using a multi-cylinder cylinder dryer. The obtained anti-counterfeit paper has an average of 1400 per m ²
The individual strips were ubiquitously distributed on the paper surface in a state of being uniformly distributed. When this paper was copied with a color copier (trade name “Cannon Pixel”), the glitter color of the strips was not reproduced.
The difference between the two (manuscript and copy) was clearly recognized by visual judgment. In order to examine the uniformity of the distribution of the strips, 1000 sheets of paper were cut into a size of 177 × 67 mm, and the presence or absence of the strips was checked visually one by one. Was.

Comparative Example 1 This comparative example is an example manufactured according to a conventional technique, that is, a manufacturing apparatus proposed in Japanese Patent Publication No. 5-65639.
Except for removing the stirring blade, the production of anti-counterfeit paper was attempted in exactly the same manner as in Example 2. The small pieces tend to settle at the bottom of the storage tank due to the absence of stirring blades, and pulsation occurs when overflowing from the inclined plate, sometimes causing the small particles to stay at the upper part of the inclined plate, A large number of lumps were supplied onto the stock, and the distribution of the resulting paper strips was extremely uneven. In order to examine the uniformity of the distribution of the strips, 1000 sheets of paper were cut to the same size of 177 × 67 mm as in Example 2, and the presence or absence of the strips was checked visually one by one. Was not contained in about 40%.

[0027]

As described above, the strip sprinkling apparatus of the present invention is constituted, and when this apparatus is used for the production of the special paper described above, the strip is prevented from staying at the bottom of the storage tank. A remarkable effect is obtained that it can be ubiquitous in a very uniform distribution state.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating an example of a strip sprinkler used in the present invention.

FIG. 2 is a partially enlarged cross-sectional view thereof.

FIG. 3 is an example of a shape of a stirring blade.

[Explanation of symbols]

W Papermaking net 1 Storage tank 2 Stirrer blade 3 Inclined plate attached obliquely downward from the end of the storage tank in the direction of travel of papermaking net W 4 Water suspension of strips 5 Stock before forming paper layer on papermaking mesh 6 Supply pipe of water suspension of strips 7 Apron 11 Front chamber of storage tank 12 Rear chamber of storage tank 21 Shaft 22 Metal pipe M Motor T Table roll W Papermaking net

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Masahito Sugimura 501 Honjuku, Nagaizumi-cho, Sunto-gun, Shizuoka Pref. Special Examiner, Paper Manufacturing Co., Ltd. Tadahiro Sanada (58) Field surveyed (Int.Cl. ⁶ , DB name) D21H 21 / 42,23 / 46,27 / 02

Claims (4)

(57) [Claims] 1. A strip sprinkler comprising a storage tank 1, a stirring blade 2 installed in the storage tank 1, and an inclined plate 3 attached diagonally downward from the end of the storage tank in the traveling direction of the papermaking net W. It is set on a paper net of a fourdrinier paper machine, and the aqueous suspension 4 of the strip is supplied into the storage tank, and the aqueous suspension of the strip is overflowed onto the inclined plate 3 by the rotation of the stirring blade 2, A method for producing specialty paper, comprising sprinkling paper on a paper stock or wet paper 5 before forming a paper layer on a papermaking net to make paper. 2. The storage tank is divided into a front chamber 11 and a rear chamber 12, and the aqueous suspension of the small pieces supplied to the front chamber 11 is stirred and homogenized and then guided to the rear chamber 12. Item 10. The method for producing specialty paper according to Item 1. 3. The stirring blade 2 to which the stirring plate 22 is attached at an angle close to the attachment angle of the inclined plate 3 with respect to the central shaft 21 is used.
Manufacturing method of the special paper described. 4. The method for producing forgery prevention paper according to claim 1, wherein an apron made of a flexible material is attached to a tip of the inclined plate.