JP2000214620A - Recyclable recording material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To well remove a printing material such as a toner and to improve durability, profitableness, bendability and handleability by using at least a base material layer comprising a nonwoven fabric of plastic fibers and a water- swellable surface layer. SOLUTION: A surface layer 3 is laminated on a base material layer 1 to obtain the objective recording material. The base material layer 1 is a nonwoven fabric of plastic fibers. The nonwoven fabric is not particularly limited if it is obtained by forming the plastic fibers in a sheet shape but the fibers are preferably arranged at random. The nonwoven fabric preferably has 70-180 μm thickness, 30-150 g/m2 weight and <=15% elongation, in particular 90-170 μm thickness, 50-100 g/m2 weight and <=10% elongation. The surface layer 3 comprises a water-swellable resin prepared by crosslinking a water-soluble resin, preferably polyvinyl alcohol having many hydroxyl groups.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording material which can be repeatedly reused by forming an image with a copying machine, a printer or the like so that a printing material attached to the recording material can be removed from the recording material. In particular, the present invention relates to a recording material suitable for a removing means by physical rubbing force such as a brushing method using an aqueous solvent such as water.

[0002]

2. Description of the Related Art Today, electrophotographic copying (so-called copying) techniques using toner have become widespread, and a large amount of recording materials such as paper and OHP sheets have been used.

The printing material printed or copied on such a recording material cannot be easily removed, and since such a technique has not been put to practical use, printed matter generated in a large amount in an office becomes unnecessary. The reality is that they are just discarded.

It is obvious that this is not preferable for environmental protection and resource protection. Therefore, techniques for regenerating or recycling the recording material to be discarded are being actively studied. For example, in JP-A-7-31523 or JP-A-6-222604, a swelling layer that swells with water is formed on the surface of a recording material, and the swelling layer is swelled by wetting with water. A method for removing an image recorded on a recording material is disclosed. on the other hand,
As the recording material, a recording material generally comprising a base layer such as a plastic film or paper and a water-swellable surface layer and optionally having an intermediate adhesive layer is well known.

[0005]

However, the printing materials which have been proposed so far cannot sufficiently remove the printing material, or when the printing material is repeatedly removed (ink removal), the printing material cannot be removed. There is a problem in that defective removal occurs and the durability of the recording material is high. Furthermore, when a hydrophilic material such as paper is used as the substrate, the substrate itself does not have water resistance, so that when the water-swellable surface layer or the intermediate layer is formed thereon, the substrate is wet and dried. However, it required a great deal of energy and had problems with economics. Further, when a plastic film such as polyethylene terephthalate (PET) is used as the base material, the obtained recording material cannot achieve the desired bending property (flexibility), and the weight per unit area is heavy, so that the handling property is low. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is a recyclable recording material excellent in durability, economy, bendability and handleability capable of sufficiently removing a printing material such as toner. The purpose is to provide.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a recyclable recording material having at least a base layer made of a plastic fiber nonwoven fabric and a water-swellable surface layer.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The recording material of the present invention has at least a substrate layer and a water-swellable surface layer, and is characterized in that a nonwoven fabric made of plastic fibers is used as the substrate layer.
FIG. 1A is a schematic sectional view of a recording material according to an embodiment of the present invention. As shown in FIG. 1A, this recording material is obtained by laminating a surface layer 3 on a base layer 1. FIG.
(A) shows a state in which the printing material 4 is printed on the surface of the surface layer 3. Although FIG. 1A shows a configuration in which the surface layer 3 is formed on one surface of the base material layer 1, a configuration in which the surface layer 3 is formed on both surfaces of the base material layer 1 may be used.

In the recording material of the present invention, the substrate layer 1 is a non-woven fabric made of plastic fibers. The nonwoven fabric used in the present invention is not particularly limited as long as it is a sheet made of plastic fibers, but it is preferable that the fibers are randomly arranged. This is because the obtained recording material can have uniform strength from any direction, and the orientation at the time of use is not restricted.

The nonwoven fabric constituting the recording material of the present invention can maintain the flatness of the obtained recording material through printing and removal of the printing material, and has water resistance, moderate mechanical strength (bendability) and Physical properties such as thickness, weight, moisture content, tensile strength and elongation are not particularly limited as long as they have handleability, but the thickness is 70 to 180 μm and the weight is 30
To 150 g / m ^2, elongation is preferably 15% or less. More preferably, the thickness is 90 to 170 μm, the weight is 50 to 100 g / m ² , and the elongation is 10% or less.
Thickness exceeds 180 μm or weighs 150 g /
If it exceeds m ² , it tends to be difficult to ensure good paper passing properties. On the other hand, if the thickness is less than 70 μm or the weight is less than 30 g / m ² , it tends to be difficult to ensure good heat resistance.

[0011] Such nonwoven fabrics are commercially available, and for example, 05TH-60 (polyester wet nonwoven fabric; manufactured by Hirose Paper), 15TH-100 (polyester wet nonwoven fabric; manufactured by Hirose Paper) and the like can be used.

The plastic fiber used as a raw material of the nonwoven fabric is not particularly limited as long as it is a plastic fiber capable of obtaining the above nonwoven fabric, and any known synthetic fibers can be used. There is no particular limitation. As a material of the plastic fiber, for example, polyester, polycarbonate, polyimide, polymethyl methacrylate and the like can be mentioned, but polyester, polycarbonate, polyimide, polymethyl methacrylate and the like are preferable in consideration of water resistance (strength). Further, in consideration of heat resistance and the like, polyester, polycarbonate, polyimide and the like are preferable. Furthermore, considering versatility, price, durability, etc., polyester,
Particularly, polyethylene terephthalate (PET), polyethylene naphthalate (PEN) and the like are desirable.

The thickness and the length of the plastic fiber used in the present invention are not particularly limited, but the thickness is set to 0.1.
It is desirable that the fiber length is 2 to 30 μm and the fiber length is 0.1 to 20 mm.

As a method for producing the nonwoven fabric constituting the recording material of the present invention, any method may be adopted as long as the above nonwoven fabric can be produced using the above-mentioned plastic fibers.

The surface layer 3 formed on the base layer is made of a water-swellable resin. Water swelling means swelling but not dissolving in water or an aqueous solvent. Water-swellable resins are made by crosslinking water-soluble resins. Further, by adding a water-insoluble component to the water-soluble resin, a property of absorbing a solvent such as water and swelling but not dissolving in the solvent may be imparted.

As the water-soluble resin, a water-soluble resin having a functional group having an active hydrogen such as a hydroxyl group, an amino group, an amide group, a thiol group, a carboxyl group, a sulfonic acid group in a molecule,
For example, polyvinyl alcohol, methyl cellulose, polyacrylic acid, carboxymethyl cellulose, hydroxyethyl cellulose, polyvinyl pyrrolidone, polyacrylamide, diacetone acrylamide and the like can be used.
Preferably polyvinyl alcohol, methyl cellulose,
Polyacrylic acid is used, and among them, polyvinyl alcohol having many hydroxyl groups is preferable, and the degree of polymerization is 300 to 300.
0, preferably 500-2000, more preferably 50
It is preferably 0 to 1700. It is appropriate that such a water-soluble resin is used after being dissolved in 2 to 30 parts by weight, preferably 5 to 10 parts by weight, based on 100 parts by weight of the aqueous medium.

In order to crosslink the water-soluble resin, a crosslinking agent and, if necessary, an initiator may be added to the aqueous solution of the resin.
Any crosslinking agent may be used as long as it has reactivity with a functional group such as a hydroxyl group, an amide group or a carboxyl group present in the water-soluble resin molecule and can crosslink the water-soluble resin. For example, epoxy compounds, isocyanate compounds, glyoxals, methylol compounds, melamine resins, dicarboxylic acids, aziridines, dihydrazides and the like can be mentioned.

When the above compound is added as a cross-linking agent, it is added in an amount of 0.1 to 100 parts by weight of the water-soluble resin.
100 parts by weight, preferably 1 to 50 parts by weight are added. If the amount is too small, the film strength may be insufficient at the time of swelling, or the film may be dissolved. If the amount is too large, the crosslinking agent becomes a bulk component, which causes a problem in the strength of the surface layer and the like.

When a water-soluble resin is insolubilized by adding a water-insoluble component, a monomer or oligomer having two or more vinyl groups and a polymerization initiator thereof are added to the resin solution, and thermogravimetric or ultraviolet (UV) ) It is preferable to add an insolubilizing component by curing.

Examples of the monomer or oligomer having two or more vinyl groups include diacrylate, dimethacrylate, and urethane acrylate monomers and oligomers. The amount of the monomer or oligomer to be added is determined in consideration of the strength of the finally obtained surface layer at the time of water swelling and the ease of removal of the printing material. , Preferably in the range of 30 to 100 parts by weight.

The use of a water-soluble or hydrophilic compound as a monomer or oligomer for forming the cross-linking agent or the insoluble component has the advantage that the surface layer can be formed using water. Therefore, it is possible to prevent the organic solvent from remaining in the surface layer while ensuring the safety at the time of application.

Wettability to a resin solution constituting the surface layer,
A surfactant may be added to increase water permeability. As the surfactant, various surfactants such as anionic, cationic and nonionic can be used, and there is no particular limitation.

Further, inorganic fine particles such as silica, titanium oxide, alumina, zinc oxide and calcium carbonate and resin fine particles such as acryl and styrene may be added to the surface layer in order to improve the writing properties. When such inorganic fine particles are added, they are added in an amount of 1 to 200 parts by weight, preferably 1 to 50 parts by weight, based on 100 parts by weight of the water-soluble resin. The average particle size (secondary particle size) of the secondary particles of these fine particles is 5 μm or more and 30 μm or more.
μm or less is preferred. If the thickness is 5 μm or less, the effect on the writability is hardly obtained, and if it exceeds 30 μm, a problem may occur in the image quality or the like. The secondary particle size means a particle size when an aggregate formed by aggregating individual particles is regarded as one particle. The secondary particle size can be measured by microscopic observation or the like.

Further, the surface layer may be subjected to an antistatic treatment such as a cationic surfactant, if necessary, in order to improve the paper passing property. The antistatic agent may be added to the material forming the surface layer, or after forming the surface layer, a material dissolved and dispersed in an appropriate solvent may be applied.

As a method for forming the surface layer, a solvent coating method can be used. Specifically, the above-mentioned water-soluble resin, cross-linking agent, monomer or oligomer, and if necessary, other additives are dissolved and dispersed in a suitable solvent such as water, a water / organic solvent mixture, or an organic solvent to form a base. It may be applied on the material layer so that the film thickness after heating and drying is 0.5 to 30 μm, preferably 3 to 20 μm, more preferably 5 to 20 μm.

After coating, the surface layer is heated to 50 to 180 ° C, preferably 80 to 150 ° C. When the insolubilized component is formed in the surface layer by light irradiation, the heating may be performed after or together with the irradiation.

In the recording material of the present invention, an intermediate layer may be formed between the base layer and the surface layer. The intermediate layer is provided for the purpose of bonding the surface layer more firmly to the base material.

FIG. 1B is a schematic sectional view of a recording material having an intermediate layer according to another embodiment of the present invention. 1 is a substrate layer, 2 is an intermediate layer, and 3 is a surface layer. FIG. 1 (b)
1 shows a configuration in which the printing material 4 is printed on the surface of the surface layer 3. Although FIG. 1B shows a configuration in which the intermediate layer 2 and the surface layer 3 are formed on one surface of the base material layer 1, a configuration in which the intermediate layer 2 and the surface layer 3 are formed on both surfaces may be used.

The intermediate layer 2 is made of a resin having a high adhesiveness. The intermediate layer contains a compound (reactive compound) having a functional group capable of chemically bonding to the resin constituting the surface layer, if desired. By containing a reactive compound in this way, the adhesiveness and bonding property between the intermediate layer and the surface layer can be improved.

Examples of the resin having high adhesiveness constituting the intermediate layer include acrylic resin, styrene resin, polyester resin,
Examples thereof include a polycarbonate resin, a vinyl acetate resin, a vinyl chloride resin, and a urethane resin, and preferably, a polymethyl methacrylate resin, a polyester resin, a polycarbonate resin, a vinyl chloride resin, and a urethane resin. In particular, it is preferable to use a material having high adhesiveness to the base material layer.

The reactive compound optionally contained in the intermediate layer is not particularly limited as long as it has a functional group capable of chemically bonding to the resin constituting the surface layer. Examples thereof include a methylol compound, an isocyanate compound, an aldehyde compound and an epoxy compound. Compounds, aziridine compounds and the like can be used. When the resin constituting the surface layer is a resin having a hydroxyl group such as polyvinyl alcohol and methyl cellulose, a methylol compound, an isocyanate compound, an aldehyde compound, and an epoxy compound are preferable. When the resin constituting the surface layer is a resin having a carboxyl group such as polyacrylic acid, an isocyanate compound, an epoxy compound, and an aziridine compound are preferable. In addition, these compounds can be similarly used as a crosslinking agent for the water-soluble resin constituting the surface layer.

Examples of the methylol compound include methylolated melamine such as dimethylolmelamine and trimethylolmelamine, dimethylolated urea, and melamine-formaldehyde resin. In addition to these, various methylol compounds can be used, and those having a moderately high molecular weight and those having a moderately long molecular chain are preferable. From this viewpoint, among the methylol compounds exemplified above, melamine- Formaldehyde resins are preferred.

Examples of the aldehyde compound include glyoxal and glutaraldehyde. In addition to these, various aldehyde compounds can be used. Examples of the epoxy compound include polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, sorbitol polyglycidyl ether, sorbitan polyglycidyl ether, and polyglycerol polyglycidyl ether. In addition to these, various epoxy compounds can be used.

As the isocyanate compound, those having two or more isocyanate groups in one molecule can be used. By using a compound having a plurality of isocyanate groups, the substrate layer and the surface layer can be more firmly bonded.

As the isocyanate, for example, 4,4′-diphenylmethane diisocyanate (melting point 39)
° C) 4,4'-methylenebiscyclohexyl isocyanate (melting point 45 ° C), tris (p-isocyanatophenyl) thiophosphate, tris (p-isocyanatophenyl) methane, tolylene diisocyanate 3 adduct of trimethylolpropane, molecule An aliphatic polyisocyanate having a hydrophilic group therein can be used.

The isocyanate used in the present embodiment, including these compounds, may be protected with phenol, sulfurous acid and the like. Examples of the aziridine compound include diphenylmethane-bis-4,4'-N, N'-diethylurea and 2,2-bishydroxymethylbutanol-tris- [3- (1-aziridinyl) propinate].
Can be used. Further, an oxazoline group-containing polymer can also be used.

As the above-mentioned reactive compound, a solid or wax at room temperature or a viscous liquid at room temperature may be used. If the reactive compound is solid or waxy at room temperature or a viscous liquid at room temperature, it does not evaporate due to drying during the formation of the intermediate layer, and since the surface is not sticky after drying, the surface layer is coated. There is an advantage that it becomes easy. In addition, when a reactive compound that dissolves in water or has affinity for water is used, there is no need to use an organic solvent to apply and form the intermediate layer, and the organic solvent remains in the intermediate layer. Can be prevented.

To coat the intermediate layer 2 on the substrate layer 1,
A resin and optionally the above reactive compound in a suitable solvent,
For example, it can be performed by a solvent coating method or a melt coating method of coating and drying a solution dissolved in tetrahydrofuran (THF), dioxane, acetone, ethyl acetate, methyl ethyl ketone (MEK) or the like. What dissolved or disperse | dissolved resin, such as water-soluble or hydrophilic polyurethane and polyester in water, can also be used. Such resin solutions and resin emulsions are commercially available, and using them has the advantage that a coating film can be formed without using an organic solvent, especially a non-aqueous organic solvent. For this reason, safety at the time of manufacture can be improved. Further, it is possible to suppress a problem such as generation of gas of a residual solvent from the inside due to heating of the recording material due to paper passing through a copying machine or the like. When an aqueous solvent is used, the addition of a surfactant makes it easier to apply the intermediate layer. If the intermediate layer and the surface layer are formed using an aqueous solvent, it is possible to manufacture a recording material without using a non-aqueous organic solvent, and to ensure the safety and residual non-aqueous organic solvent in the recording material. Problems can be prevented. By the solvent coating method or the melt coating method, the film thickness is about 0.5 μm to 20 μm, preferably about 0.5 to 10 μm, more preferably 0.5 to 6 μm.
An intermediate adhesive layer is formed to a thickness of about μm. If the thickness is less than 0.5 μm, coating unevenness is likely to occur, and an uncoated portion tends to be formed. If it exceeds 20 μm, problems may occur in the strength, heat resistance and the like of the recording material.

If the reactive compound is a high molecular weight substance, which itself has a film-forming property and is excellent in adhesiveness to the base material layer, the reactive compound itself is dissolved in a solvent or the like, coated and dried. It is also possible to form. In the case of coating by adding to a resin solution, the addition amount of the reactive compound can be, for example, 5 to 50 parts by weight based on 100 parts by weight of the resin constituting the intermediate layer.

It is considered that at the stage when the intermediate layer is applied, a part of the compound remains in the resin of the intermediate layer and functions as an active ingredient as it is. The intermediate layer may be subjected to a corona discharge treatment. When using a paper or fibrous base material, immerse the base material in the coating solution for forming the intermediate layer, impregnate the base material with the coating solution, and fill the intermediate layer material between the fibers constituting the base material. It may be.

By providing the intermediate layer having the above structure between the base material layer and the surface layer, the surface layer is peeled off from the base material layer even after the steps of liquid application → swelling → removal of printing material. Therefore, the recording material can be more reliably stayed on the base material layer, and the number of times of reusing the recording material can be significantly increased.

In another aspect of the present invention, the recording material of the present invention comprises a nonwoven fabric composed of plastic fibers having an intermediate coat layer and a water-swellable surface coat layer. That is, the plastic fibers constituting the nonwoven fabric have an intermediate coat layer and a water-swellable surface coat layer.

The plastic fibers constituting the non-woven fabric as the recording material in this embodiment have a laminated structure as shown in FIG. FIG. 2 is a schematic enlarged view of one fiber having such a structure, and the fiber is formed on a core material 101 made of a plastic material by an intermediate coating layer 1.
02 and the surface coat layer 103 are formed. As the core of the fiber, the same plastic fiber as described above can be used. As the material of the intermediate coat layer and the surface coat layer, the same materials as those used for the above-described intermediate layer and surface layer can be used. Regarding the thickness of the intermediate coat layer and the surface coat layer, if the effects of the present invention can be obtained, that is, a recording material that can sufficiently remove the printing material and has excellent durability, economy, bending property, and handleability Is not particularly limited as long as it can be provided. The method for forming these layers is not particularly limited, and includes a known method, for example, a method using a coating device such as a bar coater.

By using a nonwoven fabric made of plastic fiber having such a structure as a recording material, the surface area of the surface coat layer (surface layer) on the recording material is increased. The contact area between the surface coat layer and a swelling liquid such as water is increased, and the swelling of the surface coat layer is performed relatively smoothly. Therefore, the performance of removing the printing material, particularly the removal speed, is further improved.

In this embodiment, the plastic fiber may have a structure in which the surface coat layer is directly formed on the core material as long as the adhesion between the core material and the surface coat layer can be ensured.

The recording material as described above can be suitably used for a method of removing a recording material through a process of swelling the surface layer → physical rubbing by brushing or the like → drying process, and is recyclable.
Further, since the recording material of the present invention uses the above-mentioned nonwoven fabric made of plastic fibers as the base material layer, it is possible to avoid the deterioration of economic efficiency due to an increase in dry energy due to the wetting of the base material, Bendability (flexibility) and handleability better than the material can be obtained. Furthermore, the recording material of the present invention has a sufficient deinking property, and the good deinking property can be maintained even by repeated removal of the printing material.

Hereinafter, a method of removing a printing material from the recording material of the present invention having a printing material such as toner printed on the surface will be described. The method includes a step of supplying a recording material on which a printing material is printed to a solvent capable of swelling the surface layer, and scraping the recording material from the swollen recording material surface with a physical force. Hereinafter, a more detailed description will be given with reference to the drawings.

FIG. 3 is a process flow chart for explaining an example of a printing material removing method. In FIG. 3, the recording material 1
00 has an intermediate layer and a surface layer formed on both sides thereof,
The intermediate layer and the surface layer are collectively shown as 12. A printing material 4 such as toner is printed on the surface of the recording material. As the printing material, toner used in electrophotography is preferably used.In addition to these, thermal transfer methods, recording materials used in printing methods, and other recording materials such as oil-based paint agents A type that adheres to form a film-like image can be used. The recording material is conveyed from right to left in the drawing.

First, a surface swelling solvent is supplied to the surface of the recording material on which the printing material 4 has been printed from the solvent supply device 11. As the solvent capable of swelling the surface layer, various solvents such as an aqueous solvent, that is, water, a mixed solvent of water and a water-soluble organic solvent, or an aqueous organic solvent can be used.
Also, a desired additive such as a surfactant may be added. As described above, the present embodiment has a great advantage in that the printing material can be removed using water. In the following description, the case where water is used will be described.

As shown in FIG. 3, the water may be supplied by showering water from the shower device 11 onto the surface layer, or immersed in water (not shown). In order for water to penetrate into the surface layer of the recording material, it is preferable to contact the recording material for about 15 to 150 seconds. The longer the contact time, the more water can be permeated, but the longer the treatment. When water penetrates into the surface layer of the recording material, the surface layer swells (the swollen surface layer is shown as 13), and the adhesive force between the printing material 4 and the surface layer decreases. At this time, the water temperature is 15 ° C
~ 45 ° C is appropriate. If the temperature is too high, the evaporation of water increases, and if the temperature is too low, a sufficient cleaning effect may not be obtained.

After the water has sufficiently penetrated into the surface layer of the recording material, the recording material is further transported to the printing material removal area, where the brush 14
To The brush 14 is rotating, and the printing material 4 on the recording material 100 is removed by the brush.
In the present invention, in addition to the brush, a means of applying a physical or mechanical force to the surface to rub or scrape the surface, such as a blade or a cloth, may be employed. FIG.
In the above, the brush 14 is arranged outside the liquid, but may be arranged in the liquid. The length of the bristles of the brush 14 is 5
The thickness can be about 20 mm and the thickness can be about 10 to 60 μm. The material is not particularly limited, but nylon or the like is suitable.

The paper passing speed, that is, the recording material is the brush 14
May be determined in consideration of the balance between the processing time and the cleaning performance, and may be, for example, 0.5 cm / sec to 5 cm / sec. The rotation speed of the brush is preferably 5 times or more, more preferably 10 times or more the transport speed.

After the printing material 4 is removed, the recording material is conveyed to a shower area, and a cleaning shower 15 is applied to the surface of the recording material to wash away the printing material remaining on the surface of the recording material. As the liquid used for the shower 15, the same aqueous solvent as used for expanding the water can be used. The same solvent used to swell the water may be used. It is particularly preferred to use water.

After the shower 15 is applied, the recording material is further conveyed to a drying area and is dried by the dryer 16.
The drying method may be a contact type such as a heat roller or a non-contact type such as a far-infrared lamp. The heating temperature is suitably about 70 to 150 ° C.

FIG. 4 is a view showing an embodiment of a cleaning apparatus to which the above-described cleaning method can be applied.
The apparatus shown in FIG. 4 includes a cleaning tank 22 for storing a liquid 30 for swelling a recording material in a casing 23. The cleaning tank 22 is connected to a pump 20 having a filter for removing printing material in the liquid in the tank, and the pump 20 is further provided with a swelling shower 11 and a rinsing shower 15 via a pipe 31. It is connected.

The liquid in the cleaning tank 22 is supplied to the pump 20.
After being purified by the internal filter, it is sent to showers 11 and 15 through a pipe 31, and is used as a liquid for swelling the recording material in the shower 11 and as a rinsing liquid in the shower 15.

The recording material is introduced into the apparatus by a paper feed roller 21 and sprayed with a swelling liquid by a shower 11, and then immersed in a liquid 30 in a cleaning tank 22 through a guide 26 and a conveying roller 24. You. And
After standing still for a predetermined time, the conveying roller 24 and the guide 28
Is sent to the opposite portion of the brush 14 to remove the printing material.

Thereafter, the recording material passes through the guide 29, the conveying roller 25, and the guide 27, is sprayed with a rinsing liquid by the shower 15, is finally dried by the drying roller 17, and is discharged out of the apparatus.

FIG. 5 is a view showing another embodiment of the cleaning device. The apparatus includes a swelling liquid tank 43 for storing the liquid 30 for swelling the recording material, and a rinsing liquid tank 42 for storing a liquid for cleaning the recording material after the surface is rubbed with the brush 14. It has the structure which has each independently. The liquid 30 stored in the swelling liquid tank 43 is pumped up by the pump 20 equipped with a filter, sent to the shower 11 through the pipe 31, and sprayed onto the recording material 100 introduced by the paper feed roller 21 for a predetermined time or a predetermined amount. . The recording material passes through the guide 26 and the transport rollers 24 and 25 and is sent to the brush 14. The swelling liquid sprayed on the recording material 100 in the shower 11 falls, returns to the swelling liquid tank 43 located below the shower 11, and is circulated.

The recording material 100 from which the printing material has been removed by the brush 14 is sent to a shower 15, and a cleaning shower 15 is applied to the surface of the recording material. In the cleaning shower, the rinsing liquid 50 stored in the rinsing liquid tank 42 is pumped up by the pump 40 equipped with a filter.
It is supplied to the shower area through a pipe 41. The printing material scraped off by the brush and the printing material washed away by the rinsing liquid are applied to a filter 45 provided at the top of the rinsing liquid tank.
It is filtered together with the cleaning shower liquid that falls on the shower area and falls from the shower area, the printing material is filtered, and the rinsing liquid is returned to the tank 42 for circulating use. The recording material that has passed through the shower area passes through a guide 27, is finally dried by a drying roller 17 having a built-in heater, and is discharged outside the apparatus.

[0061]

Example 1 Base material layer; polyester wet nonwoven fabric (05T
H-60; manufactured by Hirose Paper Co., Ltd., thickness 109 μm, weight 57.
9 g / m ² ). Intermediate layer: Dioxane 18
A resin solution dissolved in 6 g was prepared. To the resin solution was added 2 g of a melamine-formaldehyde resin (SUMIREZE 613; manufactured by Sumitomo Chemical Co., Ltd.) and the mixture was stirred. The obtained solution was applied to a base material layer using a bar coater, heated at 80 ° C. for 5 minutes, and further subjected to corona discharge treatment to form a 4 μm thick intermediate adhesive layer. Surface layer: polyvinyl alcohol CM-3 as a water-soluble resin
12 (manufactured by Kuraray) was dissolved in 188 g of water to prepare a resin solution. 0.5 g of a melamine-formaldehyde resin (Sumilez 613; manufactured by Sumitomo Chemical Co., Ltd.), 0.6 g of ammonium chloride and 0.1 g of polyoxyethylene coconut oil fatty acid monoethanolamide as a surfactant were added to the resin solution.
Was added and stirred for 5 minutes. The obtained liquid was applied on the intermediate adhesive layer with a bar coater, and heated at 120 ° C. for 2 hours to form a surface layer having a thickness of 10 μm.

Example 2 Substrate layer; Polyester wet nonwoven fabric (15T
H-100; manufactured by Hirose Paper Co., Ltd., thickness 165 μm, weight 9
9.1 g / m ² ). Intermediate layer: 5 g of polyvinyl butyral resin was added to methanol 1
This was dissolved in 95 g to prepare a resin solution. The above nonwoven fabric, which is a base material layer, is immersed in the resin solution, pulled up at a rate of 1 cm / sec, and dried at 50 ° C. for 5 minutes to form a 2 μm
Was formed. Surface layer: polyvinyl alcohol PVA- as a water-soluble resin
220 g (manufactured by Kuraray Co., Ltd., saponification degree: 88%) with water 188
g) to prepare a resin solution. 0.6 g of an epoxy-based crosslinking agent (Epolite 400E, manufactured by Kyoeisha Chemical Co., Ltd.) as a crosslinking agent and 0.4 g of polyoxyethylene alkylphenyl ether as a surfactant were added to the resin solution, and the mixture was stirred for 5 minutes. The sheet coated with the intermediate adhesive layer was immersed in the obtained liquid, pulled up at 1 cm / sec,
After heating for a minute, a surface layer having a thickness of 6 μm was formed.

Evaluation An image was formed on the recording material obtained in the above example using a commercially available electrophotographic copying machine (EP-4050; manufactured by Minolta). The recording material on which the image is formed is subjected to image removal (deinking) using the apparatus shown in FIG. 4, and the initial deinking property, and deinking when the above steps from image formation to deinking are repeated five times The sex was evaluated. "◎" indicates that 95% or more of the ink was deinked.
A mark of 80% or more and less than 95% of deinking was evaluated as "○", 8
A case where only less than 0% could be deinked was rated "x".

The operating conditions of the apparatus shown in FIG. 4 are as follows.・ Use a brush roller with a core bar diameter of 12 mm having nylon brush bristles with a hair length of 10 mm and a thickness of 30 μm ・ Water temperature in the tank 30 ° C. ・ Paper passing speed 1 cm / sec ・ Immersion time in the water in the tank 2 Minute ・ Brush rotation speed / paper passing speed = 30 ・ Heat roller temperature 110 ° C

Table 1 summarizes the evaluation results.

[0066]

[Table 1]

[0067]

According to the recording material of the present invention, the printing material can be sufficiently removed, and the durability is excellent even when the printing material is repeatedly removed (ink removal). Further, since the recording material of the present invention uses a nonwoven fabric made of plastic fiber as the base material layer, it does not require a large amount of energy in a drying process at the time of its production or reproduction, is excellent in economical efficiency, and has excellent bendability ( Excellent flexibility) and handleability.

[Brief description of the drawings]

FIG. 1A is a schematic cross-sectional view of a recording material when the recording material of the present invention includes a base layer and a surface layer,
(B) is a schematic cross-sectional view of the recording material when the recording material of the present invention comprises a base layer, an intermediate layer, and a surface layer.

FIG. 2 is an enlarged view showing an example of a plastic fiber.

FIG. 3 is a process flow chart for explaining a method of removing a recording material.

FIG. 4 is a diagram illustrating an example of a cleaning device.

FIG. 5 is a diagram illustrating an example of a cleaning device.

[Explanation of symbols]

1: base material layer 2: intermediate layer 3: surface layer 4: printing material 11: shower device 12: intermediate adhesive layer + surface layer 13: swollen surface layer 14: brush 15: cleaning shower 16: dryer 100: recording material 101: Fiber core material 102: Fiber intermediate coat layer 103: Fiber surface coat layer

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4L033 AA04 AB01 AB07 AC02 AC15 BA71 CA27 CA29 CA36 CA47 CA48 CA70 DA02 4L055 AG64 AG80 AG82 AG87 AG93 AJ02 BE09 BE10 FA11 FA13 FA30 GA10

Claims (1)

[Claims] 1. A recyclable recording material having at least a base layer made of a plastic fiber nonwoven fabric and a water-swellable surface layer.