JPH07152290A - Toner removing method - Google Patents

Abstract

PURPOSE:To surely and excellently remove only toner from a fixing paper without deteriorating the quality of a paper sheet and further, to efficiently use a remove over and over again besides being safety by brushing a toner fixing surface so as to peel the toner, while dipping the toner-fixing surface side of the paper into the remover in a dipping tank. CONSTITUTION:The fixing paper 10a consecutively supplied from a feeding roller 6 is fed to the dipping tank 2 by a forward carrying belt 9 and dipped into the remover 4 in the dipping tank 2. When the fixing paper 10a is dipped in the tank 2, the binder resin of the toner fixing on the surface of the fixing paper 10a becomes a gum state by swelling and dissolving and is easily peelable from the fixing paper 10a. After the easily peelable toner is peeled by a brushing roller 8 as a brushing means to obtain a paper sheet 10b, it is pulled up from the dipping tank 2 by a backward carrying belt 9, dried by a heating roller 7 and then, recovered in a recycled paper tray 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention removes only the toner from the surface of a toner-fixed paper on which a toner of a predetermined original pattern is fixed on the surface by a dry copying machine or a laser printer using an electrophotographic system. The present invention relates to a method of reproducing only a sheet before toner fixing.

[0002]

2. Description of the Related Art A dry copying machine or a laser printer utilizing an electrophotographic system is capable of copying or printing a predetermined document by fixing toner on the surface of a sheet. That is, these dry copying machines and laser printers knead and pulverize pigments such as carbon black, thermoplastic resins such as acrylic-styrene copolymer resins and polyester resins, charge control agents, and dispersing surfactants. ， Transfer the classified and adjusted toner onto the paper surface of the specified original pattern in the copier or printer,
A predetermined original pattern is fixed on the paper by fixing the toner on the paper surface by heating and melting the thermoplastic resin in the toner.

Therefore, the original pattern once copied or printed is firmly fixed on the paper surface and is excellent in storability. On the other hand, recently, environmental protection of the earth has been advocated all over the world, and recycled paper has come to be used. However, as described above, toner-fixed paper (hereinafter referred to as “fixed paper”) is used. (Note) is that the toner is fixed on the surface by melting the resin component in the toner by heating or the like.
The toner cannot be easily peeled off or removed.

Therefore, in a company or the like, in order to erase confidential information, the fixed paper is cut by a shredder or the like and discarded, which is not preferable from the viewpoint of recycling of resources. Therefore, the fixing paper that is no longer needed is dipped in a solvent, or the solvent in the toner is dissolved by spraying or applying the solvent onto the toner fixing surface of the fixing paper, and then the toner is washed,
A method of removing by a method such as suction or adsorption and reproducing as a sheet in a state before toner fixing (JP-A-4-3003).
Japanese Patent Laid-Open No. 95) has been proposed.

[0005]

However, in the above regenerating method, the thermoplastic resin in the toner component is dissolved by a low boiling point solvent such as carbon tetrachloride or chloroform. If you do not do, the dissolved resin together with pigments such as carbon black,
On the contrary, it may penetrate into the paper fibers and stain the paper itself, so that it cannot be used as recycled paper.

On the other hand, if the strength of washing and suction is too strong, the quality of the paper is damaged and it cannot be used as recycled paper. In addition, low boiling point solvents such as carbon tetrachloride and chloroform are highly toxic and have problems in working environment.Because the resin and pigment dissolve into the solvent as they are used, the solvent must be replaced frequently. However, there is a problem that the paper is contaminated on the contrary.

Therefore, the inventor of the present invention has disclosed in JP-A-63-317.
The removing agents for removing paints, varnishes, etc. proposed in Japanese Patent Application Laid-Open No. 567 and JP-A-2-267557 were used in place of the low boiling point solvent. I didn't arrive. In view of such circumstances, the present invention is capable of surely and cleanly removing only the toner from the fixing paper without deteriorating the paper quality of the paper, and is not only safe but also effective for removing the removing agent many times. It is an object of the present invention to provide a toner removal method that can be used well.

[0008]

In order to achieve such an object, the invention described in claim 1 (hereinafter, referred to as "first invention").
In the method for removing toner according to (1), the liquid compound (A) capable of dissolving or swelling the toner, the liquid compound (B) not dissolving the toner, and the surfactant are at least mixed, and the liquid compound (A) is The removing agent dispersed in the liquid compound (B) is placed in an immersion tank, and at least the toner fixing surface side of the toner-fixed paper is immersed in the removing agent in the immersion tank while brushing the toner fixing surface through the brushing means. Then, it is configured to include a step of peeling the toner and a step of drying the paper from which the toner has been removed.

In the toner removing method according to the invention described in claim 1 (hereinafter referred to as "second invention"), the liquid compound (A) capable of dissolving or swelling the toner and the liquid compound not dissolving the toner ( B) and a surfactant are mixed at least, and a removing agent in which the liquid compound (A) is dispersed in the liquid compound (B) is placed in a dipping tank and at least the toner fixing surface side of the toner-fixed paper is placed. The structure is provided with a step of irradiating the toner fixing surface with ultrasonic waves while immersing in the removing agent in the dipping tank to peel off the toner, and a step of drying the toner-free paper.

The brushing means in the first invention is not particularly limited as long as it does not damage the paper, but for example, natural fibers such as wool, cotton, silk and the like, and polyester resin which is relatively resistant to the remover. Fibers, polyethylene resin fibers, polypropylene resin fibers, fluororesin fibers, and other ultrafine synthetic fiber felt roll brushes are applied to the surface of the paper while rotating and peeling, or when a water stream is applied to the surface of the paper. There are water jet brushing means, etc., but when a brushing roll is used as the brushing means, the brushing roll is pressed against the surface of the paper while rotating at a speed different from the traveling speed of the paper, particularly a negative rotation with respect to the traveling direction of the paper. It is preferably provided so as to rotate at the speed, that is, in the opposite direction.

Further, in the second invention, the frequency of the ultrasonic wave is 1 KHz to 1 MHz (particularly preferably 25 to 5).
0 KHz), output 1 mW / cm ² or more (preferably 10)
It is preferably 0 mW / cm ² or more and ² KW / cm ² or less). Further, the liquid compound (A) constituting the removing agent in the first invention and the second invention is not particularly limited, but is, for example, an organic ester compound, an organic hydrocarbon compound, a fatty acid compound, an organic ketone compound, a halogenated carbonization. At least one compound selected from the group consisting of hydrogen compounds, aldehyde compounds, ether compounds, heterocyclic compounds, alcohol compounds, organic nitrogen compounds, animal oils, vegetable oils and their derivatives can be mentioned.

As the organic ester compound, for example,
Ethyl acetate, ethyl oleate, ethyl acrylate, methyl methacrylate, dibutyl succinate, diethyl phthalate, dibutyl phthalate, diethyl tartrate, butyl palmitate, dioctyl phthalate, α-amino acid ethyl,
Aliphatic ester compounds such as L-ethyl glutarate and derivatives thereof, aromatic ester compounds such as methyl benzoate and triphenyl phosphate and derivatives thereof, cyclic ester compounds and derivatives thereof, and heteroesters such as methyl isonicotinate Examples thereof include cyclic ester compounds and their derivatives, coal oxides (montane wax oxides), petroleum oxides, and the like.

Examples of the organic hydrocarbon compound include:
Examples include white kerosene, liquid paraffin, heptane, benzene, toluene, and cyclohexane. As the halogenated hydrocarbon compound, 1,1,1-trichloroethane,
Examples include α-chlornaphthalene and methylene chloride. Examples of alcohol compounds include n-octyl alcohol, n-decyl alcohol, polyethylene glycol, methyl cellosolve, tert-amyl alcohol, phenol, benzyl alcohol, and methylbenzyl alcohol.

Examples of the fatty acid compound include benzoic acid, alkenylsuccinic acid, naphthenic acid, oleic acid and isononanoic acid. Examples of the ketone compound include methyl ethyl ketone and methyl isobutyl ketone.
Examples of the aldehyde compound include benzaldehyde.

Examples of ether compounds include ethyl ether, diisopropyl ether, octylphenyl ether and the like. As the organic nitrogen compound, N, N
-Dimethylformamide, diethylamine, aniline,
Examples thereof include dicyclohexylamine. In addition, these organic compounds may be used alone or in combination of two or more.

On the other hand, as the liquid compound (B), water is generally used, but methanol, ethanol, paraffin hydrocarbons, isoparaffin hydrocarbons and the like can also be used.
Particularly preferably, the dibasic carboxylic acid diester as the liquid compound (A) is 15% by weight or less as a removing agent, and at least one auxiliary selected from the group consisting of glycol monoethers and pyrrolidone derivatives. Is preferably 1% by weight or more, and the balance is composed of a surfactant and water as the liquid compound (B).

As the dibasic carboxylic acid diester,
For example, oxalic acid, malonic acid,
Lower alkyl diesters of dibasic carboxylic acids such as adipic acid, succinic acid, gluconic acid, citric acid, tartaric acid and phthalic acid, which have low solubility in water at room temperature (substantially 1% by weight or less) They can be used alone or in combination of two or more.

The concentration of the dibasic carboxylic acid diester is not particularly limited as long as it is 15% by weight or less.
About 5 to 10% by weight is particularly preferable. Although the glycol monoethers are not particularly limited, for example, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, which has high solubility in water,
Ethylene glycol monobutyl ether, 3-methyl-
Examples thereof include glycol monoalkyl (or allyl) ethers (so-called cellosolves) such as 3-methoxybutanol, diethylene glycol monomethyl ether, diethylene glycol monobutyl ether, propylene glycol monomethyl ether, and propylene glycol monobutyl ether.

The pyrrolidone derivative is not particularly limited, but examples thereof include N-methyl-2-pyrrolidone. The concentration of the auxiliary agent is not particularly limited as long as it is 1% by weight or more, but about 5 to 20% by weight is preferable.
The surfactant is not particularly limited as long as it can change the form of the remover to an oil-in-water dispersion form, and examples thereof include higher fatty acid metal salts, monovalent metal salts of alkylbenzene sulfonic acid, and higher alcohols. Anionic surfactant such as monovalent metal salt of sulfate ester, alkylene oxide addition type (or non-addition type) higher alcohol alkyl or alkyl ether, alkylene oxide addition type higher fatty acid, alkylene oxide addition type (or non-addition type) Selected from nonionic surfactants such as polyhydric alcohol esters such as glycerin and sorbitan, and cationic surfactants such as quaternary ammonium salt type and amine salt type. Among them, anion field 1 surfactant and nonionic surfactant And mixtures thereof are preferred.

The removing agent may be prepared by mixing the dibasic carboxylic acid diester, the auxiliary agent, the surfactant and water at a predetermined ratio regardless of the order of addition, and stirring by high speed blade stirring for about 15 minutes. it can. Further, this remover may separate when left for a long time, but in that case, it is easily dispersed by stirring again. Further, it is preferable that the remover is heated to about 20 to 80 ° C (particularly preferably 30 to 50 ° C) in the dipping tank.

The immersion time of the copied copy paper in the immersion tank is
Although it varies slightly depending on the paper quality, about 20 to 40 seconds is preferable. The paper can be dried by heating or air drying. Incidentally, the heat drying can be carried out by a heat conduction method in which a hot roll or a heating plate is brought into contact, a radiant heat method using an oven, a heat convection method using an electric furnace, a high frequency heating method, or the like. When performing heat drying, the water-absorbent material is pressed against the front and back surfaces of the toner-removed paper that has been pulled up from the dipping tank so that the water-absorbent material absorbs water in advance and pre-dried, and then heat-dried. It is preferable.

Examples of the water-absorbing material include artificial leather and continuous foamed resin, which are generally used as a water-absorbing roller whose roller surface is formed of these materials. Further, in the first invention and the second invention, it is preferable that the removing agent in the dipping tank is circulated through a circulation path connected to the dipping tank, and is filtered by a filter provided in the middle of the circulation path.

The filter is not particularly limited, but in view of pressure loss, a filter having a roughness of about 100 to 200 mesh is preferable.

[0024]

According to the first aspect of the invention, when the fixing paper is dipped in the removing agent, the toner fixed on the surface of the fixing paper becomes gum-like and easily peels off from the surface of the fixing paper. Then, lightly brush the surface of the fixing paper in which the toner is easily peeled off by the brushing means,
Only the toner easily peels from the paper without damaging the paper.

If a roll brush is used as the brushing means and the brushing roll is pressed against the paper and rotated in the opposite direction, the toner once peeled off is scraped in the direction opposite to the traveling direction of the paper. It is completely prevented from being ejected and reattaching to the paper. Finally, by heating and air-drying in the drying process, the paper is regenerated in the state before the toner fixing. When heat drying is performed in the drying process, if the removal agent impregnated in the paper with the water absorbing material is absorbed and removed as preliminary drying before heat drying, shrinkage and wrinkles of the paper occur during heat drying. Is prevented.

Further, the peeled toner becomes gum-like and floats in the removing agent, so that the removing agent in the dipping tank is circulated through the circulation path and filtered during the circulation. By doing so, only the toner can be removed, the removing agent in the dipping tank can always be kept in a clean state, and the action and effect of the removing agent can be maintained for a long period of time.

On the other hand, according to the structure of the second invention, when the fixing paper is dipped in the removing agent as in the first invention, the toner fixed on the surface of the fixing paper becomes gum-like and peels off from the surface of the fixing paper. However, the penetration of the removing agent into the fixing paper is increased by the irradiation of ultrasonic waves, and the peeling is more likely to occur. Moreover, ultrasonic vibrations occur on the fixing paper, and this vibration allows the toner alone to be easily peeled off from the paper without damaging the paper.

[0028]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto. FIG. 1 schematically shows an example of a removing device used for carrying out the toner removing method according to the present invention.

As shown in the figure, this apparatus A comprises a storage tank 1 and a dipping tank 2. The storage tank 1 and the immersion tank 2 are
While being connected through the circulation path 3,
It is provided with heaters 5 and 5 for heating the removing agent 4 accumulated inside. The circulation path 3 is provided with a circulation pump 31 and a filter 32 on the way so that the removing agent 4 of the immersion tank 2 and the storage tank 1 circulates between the immersion tank 2 and the storage tank 1 through the circulation path 3. Has become. In the figure, 11 is a recycled paper tray, and 21 is a sensor for measuring the concentration of the removing agent 4 in the dipping tank 2. The concentration sensor 21 may be of a type that measures the refractive index, electric resistance, etc. of the removing agent 4.

Further, this apparatus A is provided with a paper feed roller 6 and a heating roller 7 in front of and behind the dipping tank 2, and the dipping tank 2
A brushing roll 8 as a peeling means is provided inside, and a conveying belt 9 is provided before and after the brushing roll 8.
9 are provided. The brushing roll 8 is
It may be a driven rotary type or a driven rotary type. The direction of rotation may be either forward or reverse.

That is, in the apparatus A, the fixing paper 10a continuously supplied from the paper feed roller 6 is sent to the dipping tank 2 by the front transport belt 9 to remove the removing agent 3 in the dipping tank 2.
Immerse in. When the binder resin of the toner fixed on the surface of the fixing paper 10a is dipped in the dipping tank 2, the binder resin becomes a gum due to swelling or dissolution and becomes easily peelable from the fixing paper 10a.

Then, the toner which has become easy to peel off is peeled off by a brushing roll 8 as a brushing means to form only the paper 10b, and then the paper 1
0b is pulled up from the dipping tank 2 by the rearward conveyor belt 9 and dried by the heating roller 7, and then collected in the recycled paper tray 11. Further, the removing agent 4 is circulated between the storage tank 1 and the immersion tank 2 by the circulation pump 31 provided in the circulation path 3, and is filtered by the filter 32. The toner component peeled off in the immersion tank 2 is filtered by the filter 3
Removed by 2 only clean remover 4 in reservoir 1
And then sent to the dipping tank 2 again.

Therefore, the removing agent 4 in the dipping tank 2 can be used in a clean state forever without contaminating the paper itself. FIG. 2 schematically shows another example of the removing device used for carrying out the toner removing method according to the present invention. In this apparatus B, an inlet side wall surface 22 of the dipping tank 2 is provided in parallel with the fixing paper 10a fed into the dipping tank 2, and an ultrasonic oscillator 23 is provided along the inlet side wall surface 22. The fixing paper 10a is irradiated with ultrasonic waves generated from the above to vibrate the fixing paper 10a. The distance between the ultrasonic oscillator 23 and the fixing paper 10a is set so that the fixing paper 10a hits the node of the ultrasonic waves.

By this ultrasonic vibration, the toner swollen by the remover is peeled off from the fixing paper 10a. Also,
A brushing roll 81 as a brushing unit is provided behind the guide roller 25 in the rear of the ultrasonic transmitter 23, that is, in the traveling direction of the paper, so that the toner can be more reliably removed from the fixing paper 10a. Has become.

The brushing roll 81 is in the opposite direction (FIG. 2) to the paper traveling direction (arrow Y direction in FIG. 2).
It rotates in the direction of arrow X). That is, when the brushing roll 81 is adapted to rotate in the same direction as the paper traveling direction, the brushing roll 8
1 may cause the toner scraped off from the fixing paper 10a to reattach. Therefore, in this device B, as described above, by rotating the brushing roll 81 in the direction opposite to the sheet advancing direction, the toner scraped off from the fixing paper 10a is prevented from falling on the paper surface behind the brushing roll 81. , Prevents reattachment.

Moreover, as shown in FIG. 3, the brushing roll 81 is provided with a removing means 82 for removing the toner adhering to the surface thereof. The removing means 82 is
It is composed of a main body 83 and a blade 84. Body 8
3 has a substantially fan-shaped cross-section, and a large number of bristles 83a are planted so as to face in the direction opposite to the rotation direction of the brushing roll 81, and are rotated around a rotation shaft 83b. When the brushing roll 81 is rotating, the bristles 83a are stopped in contact with the brushing roll 81, and when the brushing roll 81 does not rotate (when the paper is not fed), the main body As indicated by the chain line, 83 rotates in the direction of the blade 84, and the bristles 84 comb the bristles 83a. The toner adhered to the brushing roll 81 is bristled.
It is scraped off with 3a.

That is, since the bristles 83a are planted so that the bristles 83a face in the direction opposite to the rotating direction of the brushing roll 81, the toner once scraped off by the bristles 83a is accumulated between the bristles 83a and the main body. It does not separate from 83 and does not adhere again to the paper surface. Then, as shown by the chain line, when the main body 83 rotates in the direction of the blade 84, the bristles 83a are combed in the forward direction by the braces 84, so that the toner accumulated between the bristles 83a can be removed cleanly. .

On the outlet side of the dipping tank 2, water-absorbing rollers 24 are provided vertically as a pre-drying means, and the paper 10b coming out of the dipping tank 2 is sandwiched between the two water-absorbing rollers 24 from above and below. The removing agent adhering to 10b is absorbed. The removing agent absorbed by the water absorbing roller 24 is squeezed by a squeeze roll 25 provided on the water absorbing roller 24, as shown in FIG.

That is, in this apparatus B, the removing agent that has permeated the paper is substantially removed by the water-absorbing roller 24 before heating and drying, and then the apparatus is heated and dried by heating means such as a heating roller. Therefore, it is possible to prevent the paper from shrinking due to the heating and drying. (Examples 1 to 9 and Comparative Examples 1 to 9) Papers having a basis weight of 64 g / m ² and having a black toner having a polystyrene-acrylic resin as a binder fixed on one surface were dipped in the removing agents shown in Table 1 and Table 2, respectively. At the same time, a magnet bar (rotor) surrounded by a bristle brush (Nylon 6 type brush manufactured by Nippon Seal Co., Ltd.) was rotated at a speed of 100 rpm on the paper surface to observe the releasability of the toner after a predetermined time. The results are shown in Tables 1 and 2 together with processing temperature and processing time.

In the table, ⊚ indicates that the film peels well, ◯ indicates that the film peels, Δ indicates that the film peels slightly, and × indicates that the film does not peel. The composition of each remover is as follows. Remover A (O / W type) dibasic carboxylic acid diester (adipic acid diester 17%, dimethyl glutarate 66%, dimethyl succinate 17%) ・ ・ ・ 10 wt% 3-methyl-3-methoxybutanol・ ・ 10 wt% Organic acid ester sulfate ・ ・ ・ 6 wt% Polyoxyalkylene monoalkyl ether ・ ・ ・ 1.4 wt% Polyoxyethylene alkylphenyl ether ・ ・ ・ 1.3 wt% Water ・ ・ ・ 71.3 wt%

Remover B (O / W type) dibasic carboxylic acid diester (17% adipic acid diester, 66% dimethyl glutarate, 17% dimethyl succinate): 8% by weight 3-methyl-3- Methoxybutanol: 8% by weight Organic acid ester sulfate: 4.5% by weight Polyoxyalkylene monoalkyl ether: 1.0% by weight Polyoxyethylene alkylphenyl ether: 1.3% by weight Water: 76.9% by weight Remover C (O / W type) dibasic carboxylic acid diester (adipic acid diester 17%, dimethyl glutarate 66%, dimethyl succinate 17%): 5% by weight 3-methyl-3-methoxybutanol・ ・ 5% by weight Organic acid ester sulphate ・ ・ ・ 3% by weight Polyoxyalkylene monoalkyl ether ・ ・ ・ 0.7% by weight Polyoxyethylene Kill phenyl ether.. 0.8 wt% water: 85.5 wt%

Remover D (O / W type) dibasic carboxylic acid diester (17% adipic acid diester, 66% dimethyl glutarate, 17% dimethyl succinate): 15% by weight 3-methyl-3- Methoxybutanol: 15% by weight Organic acid ester sulfate: 9% by weight Polyoxyalkylene monoalkyl ether: 2% by weight Polyoxyethylene alkylphenyl ether: 2.5% by weight Water: 56.5% by weight Remover E (O / W type) dibasic carboxylic acid diester (17% adipate diester, 66% dimethyl glutarate, 17% dimethyl succinate) ・ ・ ・ 20 wt% 3-methyl-3-methoxybutanol・ ・ 20% by weight Organic acid ester sulfate ・ ・ ・ 12% by weight Polyoxyalkylene monoalkyl ether ・ ・ ・ 2.6% by weight Polyoxyethylene Kill phenyl ether.. 3.3 wt% water: 42.1 wt%

Remover F (O / W type) dibasic carboxylic acid diester (17% adipic acid diester, 66% dimethyl glutarate, 17% dimethyl succinate): 8% by weight N-methyl-2- pyrrolidone · 8 wt% organic acid ester sulfates ... 4.8 wt% polyoxyalkylene monoalkyl ether ... 1.0% by weight polyoxyethylene alkyl phenyl ether.. 1.3 wt% water: 76.9 wt% removal Agent G (O / W type) phthalic acid diester ・ ・ ・ 10 wt% 3-methyl-3-methoxybutanol ・ ・ ・ 10 wt% Organic acid ester sulfate ・ ・ ・ 6 wt% Polyoxyalkylene monoalkyl ether ・ ・・ 1.4 wt% Polyoxyethylene alkylphenyl ether ・ ・ ・ 8.4 wt% Water ・ ・ ・ 64.2 wt%

Remover H (O / W type) phthalic acid diester: 5% by weight 3-methyl-3-methoxybutanol: 15% by weight Organic acid ester sulfate: 3% by weight Polyoxyalkylene mono Alkyl ether ・ ・ ・ 1% by weight Polyoxyethylene alkylphenyl ether ・ ・ ・ 5.7% by weight Water ・ ・ ・ 70.3% by weight Remover I (O / W type) phthalic acid diester ・ ・ ・ 15% by weight Ethylene glycol monoethyl ether・ ・ ・ 15% by weight Organic acid ester sulfate ・ ・ ・ 9% by weight Polyoxyalkylene monoalkyl ether ・ ・ ・ 2% by weight Polyoxyethylene alkylphenyl ether ・ ・ ・ 12.6% by weight Water ・ ・ ・ 46.4% by weight

Remover J (O / W type) phthalic acid diester: 8% by weight 3-methyl-3-methoxybutanol: 16% by weight Organic acid ester sulfate: 4.8% by weight Polyoxyalkylene mono Alkyl ether ・ ・ ・ 2% by weight Polyoxyethylene alkylphenyl ether ・ ・ ・ 7.4% by weight Water ・ ・ ・ 61.8% by weight Remover K (W / O type) phthalic acid diester ・ ・ ・ 5.3% by weight 3-methyl-3 -Methoxybutanol: 5.3 wt% Organic acid ester sulfate: 3.2 wt% Polyoxyalkylene monoalkyl ether: 0.5 wt% Polyoxyethylene alkylphenyl ether: 6.0 wt% Water: 79.7 wt% %

Remover L Dibasic carboxylic acid diester (17% adipate diester, 66% dimethyl glutarate, 17% dimethyl succinate) 100% by weight remover M chloroform ・ ・ ・ 100% by weight remover N 3-methyl-3-methoxybutanol: 100% by weight

The removing agent O N-methyl-2-pyrrolidone ... 100 wt% removal agent P dibasic carboxylic acid diester (17% adipic acid diester, glutaric acid di-methyl 66%, dimethyl 17% succinate) ..・ 15 wt% 3-methyl-3-methoxybutanol ・ ・ ・ 85 wt% Remover Q Dibasic carboxylic acid diester (17% adipic acid diester, 66% dimethyl glutarate, 17% dimethyl succinate) ・ ・ ・8% by weight 3-methyl-3-methoxybutanol ... 92% by weight

Remover R Dibasic carboxylic acid diester (17% adipic acid diester, 66% dimethyl glutarate, 17% dimethyl succinate) ・ ・ ・ 24.5% by weight Water ・ ・ ・ 74.45% by weight Methylcellulose ・ ・ ・ 1.00 % By weight Polyoxyalkylene monoalkyl ether ・ ・ ・ 0.5% by weight

[0049]

[Table 1]

[0050]

[Table 2]

(Examples 10 to 13) OHP (overhead projector) paper (made of polyester resin) on one surface of which black toner having polystyrene-acrylic resin as a binder was fixed was dipped in each of the removing agents shown in Table 3. A magnet bar (rotor) surrounded by a bristle brush (Nylon 6 type brush manufactured by Nippon Seal Co., Ltd.) was rotated at a speed of 100 rpm on the surface of the paper to observe the releasability of the toner after a predetermined time. The results are shown in Table 3 together with the treatment temperature and the treatment time.

In the table, ⊚ indicates that the film peels well, ◯ indicates that the film peels, Δ indicates that the film slightly peels, and × indicates that the film does not peel. The composition of each remover is as follows. Scavenger S (O / W type) dibasic carboxylic acid diester (adipic acid diester 17%, dimethyl glutarate 66%, dimethyl succinate 17%): 8% by weight 3-methyl-3-methoxybutanol・ ・ 8 wt% Organic acid ester sulfate ・ ・ ・ 4.5 wt% Polyoxyalkylene monoalkyl ether ・ ・ ・ 1.0 wt% Polyoxyethylene alkylphenyl ether ・ ・ ・ 1.3 wt% Triethanolamine ・ ・ ・ 0.5 wt% Water ... 76.4% by weight

Remover T (O / W type) dibasic carboxylic acid diester (17% adipic acid diester, 66% dimethyl glutarate, 17% dimethyl succinate): 5% by weight 3-methyl-3- Methoxybutanol ・ ・ ・ 5% by weight Organic acid ester sulfate ・ ・ ・ 3% by weight Polyoxyalkylene monoalkyl ether ・ ・ ・ 0.7% by weight Polyoxyethylene alkylphenyl ether ・ ・ ・ 0.8% by weight Triethanolamine ・ ・ ・ 1.0 Weight% Water ・ ・ ・ 84.5 weight% Remover U (O / W type) dibasic carboxylic acid diester (17% adipic acid diester, 66% dimethyl glutarate, 17% dimethyl succinate) ・ ・ ・ 15% by weight 3-Methyl-3-methoxybutanol ・ ・ ・ 15% by weight Organic acid ester sulfate ・ ・ ・ 9% by weight Polyoxyalkylene monoalkyl ether · 2% by weight Polyoxyethylene alkyl phenyl ether.. 2.5 wt% Triethanolamine ... 1.0 wt% water: 55.5 wt%

[0054]

[Table 3]

Example 14 The apparatus B shown in FIG. 2 was prepared, and the toner was removed from the fixing paper under the following working conditions to obtain recycled paper. The obtained recycled paper was sufficiently durable to be reused without wrinkles.

Remover The above remover B Remover temperature 35 ° C. Distance between ultrasonic oscillator and fixing paper 3 cm Ultrasonic frequency 46 KHz Paper feed rate 10 mm / sec Peripheral velocity of brushing roll −5 mm / sec Heat drying temperature (surface Temperature) 190 ° C. Fixing paper Black paper with polystyrene-acrylic resin as a binder fixed on one surface Paper having a basis weight of 64 g / m ² The toner removing method according to the present invention is not limited to the above-described examples. For example, in the above embodiment, the ultrasonic oscillator was provided near the entrance of the immersion tank, but it may be provided in the center of the immersion tank. Further, the ultrasonic waves may be emitted from above the fixing paper.

[0057]

Since the method of removing toner from the surface of a copied copy sheet according to the present invention is configured as described above, it is possible to remove only the toner from the toner-fixed sheet cleanly without damaging the sheet quality. Therefore, the paper can be recycled and reused any number of times, and the resources can be protected. Further, since the previous document can be removed without a trace, it is not necessary to cut a confidential document with a shredder and discard it.

Further, if the removing agent is circulated through the circulation path and the toner dispersed in the removing agent is peeled off by the filter in the middle of the circulation path, the removing agent can be regenerated at low cost. It can be reused.

[Brief description of drawings]

FIG. 1 is a schematic view showing an example of a removing device used to carry out a method for removing toner from the surface of a copied copy paper according to the present invention.

FIG. 2 is a schematic view showing another example of a removing device used for carrying out the method for removing toner from the surface of a copied copy paper according to the present invention.

FIG. 3 is an enlarged view showing a brushing roll portion of the removing apparatus of FIG.

FIG. 4 is an enlarged view showing a part of a preliminary drying means of the removing apparatus of FIG.

[Explanation of symbols]

 2 Immersion tank 4 Remover 8 Brushing roll (brushing means) 23 Ultrasonic oscillator 81 Brushing roll (brushing means) 10a Fixing paper (toner-fixed paper) 10b Paper

Claims (7)

[Claims] 1. A liquid compound (A) containing at least a liquid compound (A) capable of dissolving or swelling a toner, a liquid compound (B) not dissolving a toner and a surfactant.
The removing agent dispersed in the liquid compound (B) is put in an immersion tank, and at least the toner fixing surface side of the toner-fixed paper is immersed in the removing agent in the immersion tank while the toner fixing surface is exposed through the brushing means. A toner removing method comprising a step of brushing to remove toner and a step of drying a sheet from which toner has been removed. 2. A liquid compound (A) containing at least a liquid compound (A) capable of dissolving or swelling a toner, a liquid compound (B) not dissolving a toner and a surfactant.
The removing agent dispersed in the liquid compound (B) is placed in an immersion tank, and at least the toner fixing surface side of the toner-fixed sheet is immersed in the removing agent in the immersion tank while being irradiated with ultrasonic waves. A toner removing method, comprising: a step of peeling toner, and a step of drying a paper sheet from which toner has been removed. 3. The toner removing method according to claim 1, wherein a brushing roll is used as the brushing means, and the brushing roll is rotated at a rotation speed different from the traveling speed of the paper while being pressed against the paper. 4. The toner removing method according to claim 2, wherein the frequency of the ultrasonic waves is 1 KHz to 1 MHz. 5. The method according to claim 1, wherein the removing agent in the immersion tank is circulated through a circulation path connected to the immersion tank and is filtered by a filter provided in the middle of the circulation path. Toner removal method. 6. A dibasic carboxylic acid diester as a liquid compound (A) is used as a removing agent in an amount of 15% by weight or less and at least one auxiliary agent selected from the group consisting of glycol monoethers and pyrrolidone derivatives. The toner removing method according to any one of claims 1 to 5, wherein the content is at least wt% and the balance is a surfactant and water as the liquid compound (B). 7. A water-absorbing material is pressed against the front and back surfaces of the paper from which toner has been removed from the dipping tank in the drying step, and the remover impregnated in the paper is absorbed in the water-absorbing material and pre-dried. Claim 1 which is designed to be heated and dried
7. The toner removing method according to claim 6.