JPH06192999A - Design paper - Google Patents

Abstract

PURPOSE:To obtain design paper by incorporating fine pieces capable of readily recovering fiber for papermaking from broke or waste paper into paper layer. CONSTITUTION:A material obtained by forming a coating layer consisting of a resin soluble in alkaline hot water at 60-80 deg.C and a coloring agent on a film having 60-80 deg.C temperature which is soluble in hot water and as necessary metallized and then forming the film into fine pieces having optional shape is incorporated into a paper layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a design paper in which fine particles from which papermaking fibers can be easily recovered from waste paper and waste paper are incorporated.

[0002]

2. Description of the Related Art Conventionally, design paper has been used in various fields such as book covers, book covers, commercial art printing, packaging, packaging materials and building materials. Among them, there is a design paper in which fine pieces of different materials are mixed in a paper material to make a paper, and various proposals regarding this are made. For example, a method of incorporating natural fibers or synthetic fibers dyed in various hues, a method of incorporating colored paper punched into a specific shape, a method of incorporating crushed cotton shells (JP-A-62-125099). No.), a method in which a dye is added to a protein solution and the solution is aggregated with an electrolyte or an acid to make a paper (Japanese Patent Laid-Open No. 63-295798), and a crushed gramineous seed kernel or bran is made. Methods (JP-A-1-162899), methods for incorporating wood powder and bark (JP-A-2-2640096), and the like. Also,
In order to obtain a design paper that incorporates metal-like strips,
There are a method of cutting a metal foil into pieces, and a method of metal-depositing a plastic film, coating the surface with a resin, and punching into a specific shape.

Although these design papers have excellent design effects, they have a problem that fine particles easily fall off from the surface of the paper at the time of printing, and are unsatisfactory from the viewpoint of reuse of waste paper and waste paper. It has become a thing. Recently, environmental problems have become more important worldwide, and there is an increasing need to collect and reuse papermaking fibers from waste paper and waste paper. It is inevitable that broke will occur at the time of paper making, and if the used paper (waste paper) is recovered and the papermaking fibers are recovered from these, it is necessary to efficiently remove the above-mentioned strips. Usually, throwing broke and waste paper together with water into a beater or pulper, etc., and stirring with circulation to make a slurry and then treating with a screen or a cleaner, but there are many fine pieces, and their removal is extremely difficult, It was easy to mix in the recovered fiber. For this reason, the recovered fibers were used for lower grade paper, and in some cases, broke and waste paper had to be incinerated. .

The present inventors have focused their attention on a design paper in which a strip having a specific shape is internally added, and a design paper incorporating a strip having a metallic feeling, and proceeded with the study. JP-A-63-21969
No. 8 contains an additive (strip) made of a water-soluble polymer that is colored with a colorant and crushed into a predetermined shape, so that there is little variation in quality and the additive does not peel off during printing. Proposals have been made to obtain undesigned paper. But,
This method is complicated in the process of producing colored additives, and it is necessary to increase the water resistance of the additives with a fixing agent or water resistant agent so that the colorant and water-soluble resin do not elute during papermaking. Inevitably, it was difficult to process waste paper and waste paper. Further, in this method, since the colorant is added to the water-soluble polymer, it is impossible to obtain an additive (fine piece) having a metallic feeling. As mentioned above, the strip with a metallic feel is gold,
It refers to a strip of metal foil such as brass, silver, or aluminum, or a plastic film that has been metal-deposited, resin-coated on the surface, and punched into a specific shape.

[0005]

The present invention has been made to solve these problems. That is, the problem to be solved by the present invention is that in the design paper in which colored strips having a specific shape are machined, and in the design paper in which strips having a metallic feeling are machined, the production of the strips is It is to develop a design paper that is simple and can easily recover papermaking fibers from the broke and waste paper. The present inventors first prepared various hot-water-soluble films, applied a colored resin to them, and also applied a resin to the surface after performing metal vapor deposition on the film,
A strip punched into a predetermined shape was examined. A thermosetting resin was used because the resin to be coated must have water resistance and heat resistance. These strips were made into paper, and a papermaking fiber recovery test was conducted using a beater, pulper, or the like. The purpose of this experiment is to verify the idea that if the water is heated by a method such as blowing steam during the recovery test, the resin that constitutes the film dissolves and the papermaking fibers can be easily recovered from damaged or waste paper. Is. In this case, the hot water-soluble film should not be dissolved or excessively swelled by water at the time of forming the web (wet part), and the wet paper drying zone (multi-cylinder cylinder dryer or Yankee) during the papermaking process. It is necessary that the film does not cause practically problematic deformation with a dry dryer) and that the film dissolves in hot water during processing of damaged paper and waste paper.

As a result of examination, the hot water dissolution temperature is 60 to 80 ° C.
If the film is used, it will dissolve during papermaking, excessive swelling,
It has been found that papermaking can be performed without causing any problems without causing deformation, and that the film forming the strip can be easily dissolved by heating the water with a beater, pulper or the like. However, even with this method, the lumps of the thermosetting resin and the colorant applied on the surface remain, and it is still difficult to remove the lumps. Another problem that was mixed in occurred. The reason for this is that the resin used for coating does not readily dissolve in hot water. Since these resins have a specific gravity close to that of papermaking fibers, it is difficult to remove them with a centricleaner or the like, and it is also difficult to remove them with a screen because they are fine lumps.

The inventors of the present invention further use an alkaline hot water-soluble resin as a resin to be coated on the surface, and add an alkaline substance at the time of heating treatment of broke or waste paper, which causes the above-mentioned problems. Further consideration was given to the idea that it could be resolved. As a result, they have found that this method can completely achieve the intended purpose, and completed the present invention.

[0008]

The gist of the present invention is to coat a film having a hot water dissolution temperature of 60 to 80 ° C. with a resin soluble in alkaline hot water at the temperature and a colorant. After forming a layer, to obtain a design paper in which a piece cut into an arbitrary shape is made into a paper layer, and a metal vapor deposition layer is formed on a film having a hot water dissolution temperature of 60 to 80 ° C. After forming a coating layer consisting of a resin soluble in alkaline hot water at the above temperature and optionally a colorant on top, to obtain a design paper in which a piece cut into an arbitrary shape is made into a paper layer is there.

It is known to use alkaline substances such as sodium hydroxide, sodium carbonate, slaked lime and the like when recovering broke and waste paper. These are added for the purpose of saponifying the ink vehicle and the rosin sizing agent and facilitating their removal, but they have never been used for the purpose of the present invention. Even if the coloring agent used in the present invention is not dissolved in hot alkali and remains, the proportion of the recovered fiber is small,
Further, since it is completely miniaturized, there is no problem even if it is not dissolved.

There are various water-soluble films, for example, starch-based, methylcellulose-based, carboxylated methylcellulose-based, hydroxyethylcellulose-based, polyvinyl alcohol-based, polyvinylpyrrolidone-based, vinylethyl ether-maleic anhydride copolymer-based, polyacrylic acid-based films. Examples thereof include polyethylene oxide films and the like. The film used in the present invention is 60 to 80 ° C.
It is necessary to dissolve in hot water of the above, and the above water-soluble polymers contained in this range, those having a functional group introduced into them, or those having a dissolution temperature increased by using a waterproofing agent together are used. it can. In the present invention, it is preferable to use polyvinyl alcohol because it is relatively inexpensive, easily available, and has appropriate physical strength. The solubility of polyvinyl alcohol in water is largely controlled by the degree of polymerization and the degree of saponification, particularly the degree of saponification. For example 2
Water having a saponification degree of 88% or less can be completely dissolved even in water at 0 ° C., but hot water at about 50 ° C. can be dissolved at a saponification degree of 97%, and it can be completely dissolved at about 80 ° C. for complete saponification. When a film that melts at less than 60 ° C is cut into pieces and cut into paper, the pieces melt or excessively swell in the drying zone of the paper machine, and cannot maintain a predetermined shape. It is extremely difficult and dangerous to bring the slurry to a temperature of 80 ° C. or higher during recovery, so that the melting temperature must be within the above range. The thickness of the hot water-soluble film is usually 10 to 100 μm, preferably 20 to 60 μm.

In the present invention, when the strip is required to have a metallic luster, aluminum, tin,
A metal vapor deposition layer of zinc, chromium, cobalt, nickel, copper, gold, silver or the like is formed by a known method such as a vacuum vapor deposition method, a sputtering method or an ion plating method. The vapor deposition thickness is usually in the range of 200 to 1500 angstroms. In the present invention, it is preferable to use aluminum as the metal because it is inexpensive, is less likely to corrode, has an excellent metallic luster, and dissolves easily in an alkali.

Examples of the coating resin soluble in a hot alkaline aqueous solution include vinyl acetate resin, polyester resin, acrylic resin, polycarbonate resin, polyacetal resin, ionomer resin, nitrocellulose resin,
Acetylcellulose resins, maleic acid resins, phenolic resins, melamine resins, urea resins, casein resins, shellac resins, etc. and functional groups such as hydroxyl groups and carboxyl groups to make them alkali-soluble. Examples of the resin modified by introduction include a single resin or a mixture thereof. In the present invention, a resin that does not dissolve in hot water in the temperature range of 60 to 80 ° C. but does not dissolve in hot alkaline water for the first time is selected and used from these resins. Since the alkali concentration during the pulp recovery process is usually in the range of 0.01 to 0.5% by weight, it is preferable to use a resin that dissolves in this range. Further, it is preferable to use a resin that is soluble in a solvent. This is because the water-soluble resin is likely to deform the hot water-soluble film during coating and often has poor water resistance.

In the present invention, as described above, a film having a hot water dissolution temperature of 60 to 80 ° C. is coated with a coating agent comprising a resin soluble in alkaline hot water at this temperature and a colorant. Further, a metal vapor deposition layer is formed on a film having a hot water dissolution temperature of 60 to 80 ° C., and a coating agent composed of a resin soluble in alkaline hot water at the above temperature and, if necessary, a colorant is applied thereon. . As the colorant, an organic pigment, an inorganic pigment, a dye or the like can be used. When a colored coating is applied on the vapor-deposited layer, it is preferable to use a dye in order not to reduce the metallic luster. If no colorant is used, a vapor-deposited metal color is obtained, for example silver in the case of aluminum. Further, auxiliary agents such as a viscosity adjusting agent and a curing agent may be appropriately used in combination as long as the object of the present invention is not impaired. In some cases, an anchor coating layer and a back coating layer are provided, but the resin used for this also needs to be dissolved in a hot alkaline aqueous solution at 60 to 80 ° C, and a colorant and other additives can be used in combination.

In the present invention, the processed film is further formed into a strip having a predetermined shape, and the shape can be selected from any shape such as a circle, an ellipse, a square, a rectangle and a star. As the method, any method such as a method of punching out using a tooth profile having the above-mentioned shape, or a method of slitting with a micro slitter and cutting it into fine pieces can be adopted. The size for fragmentation is usually about 0.2 to 10 mm. Then,
The strips are made into paper using known papermaking methods. The papermaking fibers used at this time may be appropriately dyed in various hues. As the strips, several kinds of strips having the same hue or different hues may be used in combination, and strips having the same hue but different tones may be incorporated. The paper layer at the time of papermaking may be a single layer or multiple layers, and in the case of multiple layers, all layers may be stripped, or any layer may be stripped. . With this combination, a complicated design effect can be obtained. The strip used in the present invention swells moderately in the papermaking process, and the resin constituting the hot water-soluble film firmly adheres to the papermaking fibers, so that even strips exposed on the surface do not peel off during printing. There is also the advantage of not having it.

[0015]

Example 1 Alkali-soluble vinyl acetate / maleic acid resin (trade name Nikkacoat HS-) having a thickness of 30 μm and a polyvinyl alcohol film having a hot water dissolution temperature of 60 ° C.
M, manufactured by Nippon Kako Paint Co., Ltd.) 2 parts by weight of dye (trade name: Oleosol Blue, manufactured by Sumitomo Chemical Co., Ltd.) per 100 parts by weight of dry matter.
0 parts were mixed. This was coated on both sides with a gravure coater to a thickness of 3 μm. Then, a strip was punched into a circle having a diameter of 3 mm. Next, 30 parts by weight of NBKP, LB
70 parts by weight of KP is beaten to 350 CSF, and a sizing agent (trade name: Size Pine E, manufactured by Arakawa Hayashi Chemical Co., Ltd.) is used as a solid content of 1% and starch (trade name: Amicor 602, manufactured by Nippon Starch Co., Ltd.) is used as a solid content of 1 pulp. %, And 3% by weight of this fine piece was added to a paper material whose pH was adjusted to 4.5 with aluminum sulfate, and the paper was made with a Fourdrinier paper machine at a dry weight of 150 g / m ² . A high-concentration pulper was charged with 5 parts by weight of the design paper thus produced, 95 parts by weight of water (that is, a pulp concentration of 5%), 0.1 parts by weight of caustic soda, and the mixture was rotated while blowing live steam to a temperature of 60 ° C. When it was raised, the base film and the resin coating layer forming the strip were completely dissolved. The residual dye was finely divided and completely dispersed in the pulp, and even when the recovered pulp was used for papermaking, this effect was not observed at all.

[0016]

Example 2 Metal aluminum was added to a polyvinyl alcohol film having a thickness of 50 μm and a hot water dissolution temperature of 80 ° C.
Vacuum-deposited 0 angstrom, and applied 3 μm of alkali-soluble nitrocellulose-based resin with 15 parts of yellow dye (trade name: Oleosol First Yellow, manufactured by Sumitomo Chemical Co., Ltd.) added to 100 parts of resin on the deposition surface and back surface. Processed (dry thickness). Then, using a micro slitter, a slit having a width of 1 mm was cut, and after slit, a length of 5 mm was cut to obtain a rectangular strip having a golden hue. Then, NB
KP 40 parts by weight, LBKP 60 parts by weight pulp 400
Beat to CSF, then add sizing agent (trade name: Size Pine E, Arakawa Hayashi Chemical Co., Ltd.) to pulp solid content 1% and starch (trade name: Amicol 602, Nippon Starch Co., Ltd.) to pulp solid content 1%, and add sulfuric acid. 2 parts by weight of this strip was added to a paper stock whose pH was adjusted to 4.5 with aluminum, and the paper was made with a cylinder paper machine at a dry weight of 120 g / m ² . Drying was performed with a multi-cylinder cylinder dryer. The high-concentration pulper was charged with 5 parts by weight of the design paper thus produced, 95 parts by weight of water (that is, a pulp concentration of 5%), and 0.15 parts by weight of caustic soda, and rotated while blowing live steam to raise the temperature to 80 ° C. When it was allowed to do so, the strip completely dissolved. The residual dye was finely divided and completely dispersed in the pulp, and even when the recovered pulp was used for papermaking, this effect was not observed at all.

[0017]

The design paper of the present invention is constructed as described above, and has the following remarkable effects. In addition to being excellent in design effect, advanced technology is required to achieve the present invention, and it is also excellent in forgery prevention performance. It is easy to recover papermaking fibers from broke and waste paper. The thin pieces that have been cut into the paper do not drop off from the surface of the paper during printing, and are excellent in printability. The strips are easy to make and can be used in small quantities.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location 7199-3B D21H 3/82

Claims (2)

[Claims] 1. A coating layer comprising a resin soluble in alkaline hot water at the temperature and a colorant is formed on a film having a hot water melting temperature of 60 to 80 ° C., and then the film is cut into an arbitrary shape. Designed paper characterized by the fact that it is made by incorporating things into the paper layer. 2. A metal vapor deposition layer is formed on a film having a hot water dissolution temperature of 60 to 80 ° C., and a coating layer comprising a resin soluble in alkaline hot water at the above temperature and, if necessary, a colorant is formed thereon. A design paper, which is formed into pieces and then cut into pieces into a paper layer.