JP2000206729A - Recyclable material to be recorded - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the durability for repeated use and to obtain excellent piper feeding property by controlling the surface roughness of a base material layer to affect the surface characteristics of the recording material itself. SOLUTION: The material to be recorded consists of a base material layer 1 and a surface layer 3 formed on the base layer 1. The surface layer 3 formed on the base layer 1 consists of a water-swellable resin. The surface of the surface layer 3 is printed with a printing material 4. As the base layer 1, pulp paper is preferably used. By controlling surface roughness (Rz) of the base material layer 1, the surface roughness (Rz) of the obtd. recording material is controlled. Namely, the surface roughness of the base material layer 1 is made to reflect on the surface roughness of the recording material, and by properly selecting the surface roughness of the babe material layer 1, the surface roughness of the recording material is controlled. In this method, the surface roughness (Rz) of the base material layer 1 is controlled to >=3 μm and <=20 μm, preferably to >=5 μm and <=17 μm. It is most preferable to select and use a material having the surface roughness (Rz) in the desired range in its initial state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording material that can be repeatedly reused by removing a printing material attached to the recording material by forming an image with a copying machine, a printer, or the like. . 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 recording materials such as paper and OHP sheets have been used in large quantities.

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 technique for removing an image recorded on a recording material has been disclosed.

In such a recyclable recording material, it is known to adjust the surface roughness of the recording material in order to better achieve the object. For example, Japanese Patent Application Laid-Open No. 7-31523 discloses that the average surface roughness is 1 to 1.
A recyclable recording material having a thickness of 30 μm is disclosed, and it is disclosed that by using a sheet within this range, both good image printing characteristics and image removing characteristics can be achieved. Further, as a method for performing such surface roughening, it is disclosed that fine particles such as gelled particles and titanium oxide are added to a surface layer.

[0006]

However, when the surface properties of the recording material are changed by such a method, durability during repeated use becomes a problem. In the recording material used in such an application, since the surface layer repeatedly swells and contracts and is slid, a local stress is easily applied to the fine particles added inside, and the fine particles are coated on the surface layer. Has been found to be difficult to maintain surface properties.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a recyclable recording material having improved durability during repeated use and having adjusted surface characteristics. In addition, another object of the present invention is to provide a recyclable recording material that can be favorably used in a printing device such as a copying machine or a printer.

[0008]

That is, the present invention relates to a recyclable recording material comprising at least a substrate layer and a surface layer, wherein the recording material is adjusted by adjusting the surface roughness (Rz) of the substrate layer. The present invention relates to a recording material wherein the surface roughness of the recording material is adjusted.

In a recyclable recording material, by reflecting the surface roughness (Rz) of the base material layer on the surface characteristics of the recording material itself, the durability in repeated use is improved, and the paper passing property is excellent. It can be. In the present invention, the surface roughness (Rz) indicates a ten-point average roughness, and indicates a value measured by a stylus type surface roughness meter Surfcom 550A (manufactured by Tokyo Seimitsu Co., Ltd.). In addition, the ten-point average roughness is the maximum to fifth peaks measured in the direction of the vertical magnification from a straight line that is parallel to the average line, and does not cross the cross-sectional curve, at the part extracted by the reference length from the cross-sectional curve. The difference between the average value of the altitude and the average value of the altitude of the valley bottom from the deepest to the fifth is expressed in micrometers (μm).

[0010]

FIG. 1 is a schematic sectional view of a recording medium according to an embodiment of the present invention. As shown in FIG. 1, this recording material is obtained by laminating a surface layer 3 on a base material layer 1. FIG. 1 shows a state where the printing material 4 is printed on the surface of the surface layer 3. Although FIG. 1 shows a configuration in which a surface layer is formed on one surface of the base material layer 1, a configuration in which a surface layer 3 is formed on both surfaces of the base material layer 1 may be used.

The substrate layer 1 is not particularly limited as long as it can maintain flatness through printing and removal of the printing material, and has water resistance and appropriate mechanical strength. For example, plastic films such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), metal foil, paper, and composite materials such as resin, paper, and metal can be used. Paper shall include all papers produced by intertwining and agglutinating vegetable fibers and other fibers, for example, pulp such as plain paper, recycled paper, coated paper, lightweight coated paper, cast coated paper, art paper, etc. Paper, P
Paper made from plastic fiber such as ET fiber,
So-called synthetic paper, such as plastic-based paper, and other papers subjected to water resistance treatment, and the like can be given.

Among the above, in the present invention, it is preferable to use pulp paper as the base material layer. In the present invention, the surface roughness of the recording material is adjusted by adjusting the surface roughness (Rz) of the base material layer. Therefore, if pulp paper is used, the range of choice is widened and the cost can be reduced. That's why. Of course, any material other than pulp paper may be selected, but pulp paper is used because it is easily and inexpensively available, has many variations in surface roughness, and the texture and feel of the finished recording material. It is particularly preferred to do so. If a recyclable recording material is manufactured using pulp paper, a recording material that is inexpensive, has excellent durability, and has a controlled surface roughness can be easily obtained. Here, pulp paper means the above-mentioned paper using pulp as a raw material, and pulp is not limited by the raw material and manufacturing method.

In the present invention, the surface roughness (Rz) of the obtained recording material is adjusted by adjusting the surface roughness (Rz) of the base material layer. That is, the surface roughness of the recording material is adjusted by reflecting the surface roughness of the base material layer on the surface roughness of the recording material and appropriately selecting the surface roughness of the base material layer. The surface roughness (Rz) of the base material layer is desirably 3 μm or more and 20 μm or less, preferably 5 μm or more and 17 μm or less. When the surface roughness (Rz) of the base material layer is smaller than 3 μm, the surface smoothness becomes too large, so that the adhesion of the recording material becomes high, and particularly high temperature and high humidity (hereinafter, H / H)
The recording materials adhere to each other in an environment, and a plurality of recording materials are fed at a time by a printing device such as a copying machine or a printer. Conversely, if it is larger than 20 μm, a problem occurs when applying the surface layer or the intermediate adhesive layer. In other words, it is difficult to apply and coat uniformly because of the rough surface roughness, the coating film thickness becomes unbalanced in the same recording material, and the image removal performance, which is a basic function, becomes uneven. I will.

In the present invention, a material having a surface roughness (Rz) originally within a desired range may be selected and used for the substrate layer, or the surface roughness (Rz) may be adjusted to a desired range by pretreatment. It is most preferable to select and use a material whose surface roughness (Rz) is originally within a desired range in consideration of processing cost and durability. As a pretreatment for adjusting the surface roughness (Rz) within a desired range, any method may be adopted as long as the surface roughness can be adjusted within the desired range. For example, a treatment such as blast etching or the like may be applied to the base material layer. And a method of adding fine particles to the substrate layer.

The surface layer 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.

Further, an ion-modified resin may be used as the water-soluble resin. Here, ionic modification refers to imparting ionicity to some of the above functional groups of the water-soluble resin. By ion-modifying the water-soluble resin in this manner, the hydrophilicity of the water-soluble resin can be improved, and the water absorption of the obtained surface layer can be improved, and the swelling speed of the surface layer can be increased.

The functional group imparted with ionicity may be any one of an anionic functional group and a cationic functional group. The anionic functional group is not particularly limited as long as it is a functional group having an anionic property.For example, a carboxyl group or a sulfonic acid group in which active hydrogen is substituted with a metal,
Examples include those in which active hydrogen of the above functional group is substituted by a substituent having a terminal at the terminal of a carboxyl group or a sulfonic acid group in which active hydrogen has been substituted with a metal. The cationic functional group is not particularly limited as long as it has a cationic functional group,
For example, a quaternized amino group, one obtained by substituting active hydrogen of the above functional group with a substituent having a quaternized amino group at the terminal, and the like can be mentioned.

To crosslink a water-soluble resin, a crosslinking agent and, if necessary, an initiator may be added to an 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, an epoxy compound, an isocyanate compound, a methylol compound, an aldehyde compound, an aziridine compound, a melamine resin, a dicarboxylic acid, a dihydrazide, and the like, and a compound having a double bond, for example, a diacrylate compound, a dimethacrylate compound, and the like can be given.

Examples of the epoxy compound include polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, sorbitol polydiglycidyl ether, sorbitan polydiglycidyl ether, polyglycerol polyglycidyl ether and the like. 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.

Examples of the isocyanate include 4,4′-diphenylmethane diisocyanate,
4'-methylenebiscyclohexyl isocyanate, tris (p-isocyanatephenyl) thiophosphate, tris (p-isocyanatephenyl) methane, trimethylolpropane tolylene diisocyanate triadduct, aliphatic poly- yl having a hydrophilic group in the molecule Isocyanates and the like 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 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, glutaraldehyde and the like. In addition to these, various aldehyde compounds can be used.

As the aziridine compound, for example, diphenylmethane-bis-4,4'-N, N'-diethyl urea, 2,2-bishydroxymethylbutanol-tris- [3- (1-aziridinyl) propinate] is used. can do. Further, an oxazoline group-containing polymer can also be used.

When the above compound is added as a cross-linking agent, 0.5 to 0.5 parts by weight of the water-soluble resin is added.
50 parts by weight, preferably 1 to 40 parts by weight are added. If the addition amount is too small, insufficient film strength at the time of swelling may become a problem or the film may be dissolved. On the other hand, if the addition amount is too large, the restraint between the resin molecular chains increases, and sufficient swelling property cannot be obtained, so that sufficient image removing performance cannot be obtained.

Further, a small amount of inorganic fine particles may be added to the surface layer within a range that does not cause deterioration, that is, desorption from the surface layer. To adjust the surface roughness, it is necessary to add a considerably large amount of inorganic fine particles. However, even with a very small addition amount, effects such as improvement in writing properties can be obtained. The addition amount of the inorganic fine particles that does not cause deterioration, that is, do not cause detachment from the surface layer, cannot be unconditionally determined because it depends on the strength of the surface layer and the like. Not more than parts by weight.

A surfactant may be added to the resin solution constituting the surface layer in order to increase the coating property (wetting property) and the permeability of water. As the surfactant, various surfactants such as anionic, cationic and nonionic can be used,
There are no particular restrictions. The amount of surfactant added is 10
0.1 to 20 parts by weight relative to 0 parts by weight, preferably 0.1 to 20 parts by weight.
5 to 10 parts by weight are preferred.

Further, an antistatic agent may be added to the surface layer, if necessary, in order to further 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. Examples of the antistatic agent include a cationic surfactant such as a quaternary ammonium salt.

As a method for forming the surface layer, a solvent coating method can be used. Specifically, the above water-swellable resin material, that is, a water-soluble resin material and a crosslinking agent, or a water-soluble resin material and 2
A monomer or oligomer having two or more vinyl groups 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, and then coated on the base material layer. I just need.

After coating, the surface layer is heated to 50 to 180 ° C., preferably 80 to 150 ° C.

The thickness of the surface layer after coating and drying cannot be unconditionally defined because it differs depending on the strength of the selected material, the presence or absence of additives, and the like, but is generally 0.5 to 30 μm, preferably 5 to 20 μm. What is necessary is just to apply so that it may become. If the thickness of the surface layer, that is, the swelling layer is too small, a sufficient amount of swelling cannot be obtained, and the image removing performance becomes insufficient. On the other hand, if the film thickness is too large, the surface roughness of the base material layer is not easily reflected, which is not only unfavorable, but also the surface strength of the surface layer is weakened, which causes durability problems such as peeling and scratching of the surface layer.

In the present invention, when the surface roughness of the substrate layer is 5 μm or less, if the surface layer is too thick, the surface roughness of the substrate layer may not be sufficiently reflected in the surface roughness of the surface layer. Therefore, it is preferable to set the thickness of the surface layer to 20 μm or less. Here, the thickness of the surface layer refers to the total thickness including the thickness of the intermediate layer when an intermediate layer described later is provided.

Here, the thickness of the surface layer refers to a value obtained by subtracting the thickness of the substrate from the thickness after coating and drying, and can be measured by a micrometer.

An intermediate layer may be formed between the substrate 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. 2 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. 2 shows a configuration in which the printing material 4 is printed on the surface of the surface layer 3. Although FIG. 2 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 substrate layer and the surface layer described in FIG. 1 can be similarly applied, and only the intermediate layer will be described below.

The intermediate layer 2 is made of a resin having 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. 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.

The reactive compound is preferably a solid or wax at room temperature or a viscous liquid at room temperature. 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 about 0.5 to 10 μm.
An intermediate adhesive layer is formed to have a thickness of about 6 μm. When 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. Here, the film thickness of the intermediate layer indicates a value obtained by subtracting the thickness of the substrate from the thickness after coating and drying, similarly to the film thickness of the surface layer, and can be measured by a micrometer.

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.

The intermediate layer may be subjected to a corona discharge treatment.

When a paper or fibrous material is used as the base material, the base material is immersed in the coating solution for forming the intermediate layer, the base material is impregnated with the coating solution, and the base material is interposed between fibers. The intermediate layer material may be filled.

The recording material of the present invention obtained as described above sufficiently reflects the surface roughness of the substrate layer. Specifically, when the surface roughness of the base material layer is adjusted within the above range, the surface roughness of the recording material, that is, the surface roughness of the surface layer is generally
It is adjusted in the range of 1 to 15 μm, preferably 2 to 10 μm.

That is, in the present invention, since the surface layer or the intermediate adhesive layer and the surface layer are coated on the base material layer as described above, it cannot be said unconditionally because it varies depending on the applied film thickness. About １ ／ to 1 times the surface roughness of the material layer is reflected in the surface roughness of the recording material itself.

For example, an intermediate layer having a thickness of 5 μm and a thickness of 9
When the surface roughness (Rz) of the base material layer is adjusted within the above range when a surface layer of μm is formed, the surface roughness of the obtained recording material is adjusted within the range of 1 to 15 μm, preferably 2 to 10 μm. can do.

The recording material of the present invention as described above can be suitably used for a method of removing a recording material through a swelling of the surface layer → physical rubbing by brushing or the like → drying process. Excellent in nature. The recording material of the present invention does not cause double feeding in a printing device such as a copying machine.

A method for removing a printing material from a recording material having a printing material such as a toner printed on the surface thereof will be described below. 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 a printing material, a toner used for electrophotography is preferably used. In addition, a recording material used for an ink-jet method, a thermal transfer method, a printing method, and the like using a hot melt ink, and other oil-based paint agents For example, a type that forms a film-like image by adhering to the surface of a recording material such as a recording medium 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 layer of the recording material on which the printing material 4 has been printed from the solvent supply device 11. As the solvent (swelling liquid) 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, desired additives such as a surfactant and inorganic fine particles 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 of the recording material, the surface swells (the swollen surface is shown as 13), and the adhesive force between the printing material 4 and the surface 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 conveyed 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 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. In FIG. 3, the brush 14 is disposed outside the liquid, but may be disposed in the liquid. The length of the bristles of the brush 14 can be about 5 to 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, for example, 0.5 cm /
Seconds 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 swelling the surface layer can be used. The same solvent used to swell the surface layer 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 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 diagram 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 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 the paper feed roller 21 and sprayed with a swelling liquid by the shower 11, then passes through the guide 26 and the transport roller 24 and is immersed in the liquid 30 in the cleaning tank 22. 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 transport 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.

[0061]

Example 1 Base material layer: Commercially available CF paper (manufactured by Minolta) was used as the base material layer. The surface roughness (Rz) was 11.46 μm. -Intermediate adhesive layer; water-dispersible urethane resin solution (HUX-2
32, manufactured by Asahi Denka Co., Ltd.), 100 g of melamine-formaldehyde resin (Sumirase 613: manufactured by Sumitomo Chemical Co., Ltd.) and 0.1 g of polyoxyethylene nonylphenyl ether were added. The mixture was stirred for 5 minutes to obtain an intermediate layer resin solution.
The above-mentioned intermediate layer resin solution was applied to the base material layer with a bar coater, dried at 120 ° C. for 5 minutes, and further subjected to corona discharge treatment to obtain an intermediate adhesive layer having a thickness of 5 μm. -Surface layer: 16 g of anion-modified polyvinyl alcohol KL-318 (manufactured by Kuraray) as water-soluble resin and 184 g of water
To prepare a resin solution. An epoxy-based crosslinking agent (Denacol EX-313, manufactured by Nagase Kasei Co., Ltd.) is added to the resin solution.
3.2 g and 0.4 g of polyoxyethylene nonylphenyl ether were added and stirred for 15 minutes. The obtained liquid was applied onto the intermediate adhesive layer with a bar coater and heated at 120 ° C. for 2 hours to obtain a surface layer having a thickness of 9 μm. The sheet thus obtained was named sheet 1. Surface roughness of sheet 1 (R
z), that is, the surface roughness (Rz) of the surface layer is 6.28 μm
Met.

Example 2 A sheet was prepared in the same manner as in Example 1 except that the base material layer was changed from CF paper to EP paper (manufactured by Minolta). The surface roughness (Rz) of the EP paper was 16.99 μm. The surface roughness (Rz) of Sheet 2 was 9.87 μm.

Example 3 The base material layer was mu-coated (A2 gloss,
A sheet was prepared in the same manner as in Example 1 except that the sheet was changed to Hokuetsu Paper Mills Co., Ltd.). The surface roughness (Rz) of the mu coat was 5.11 μm. The surface roughness (Rz) of Sheet 3 was 2.34 μm.

Example 4 Base Layer: Commercially available OK Topcoat S (A
2 gloss, manufactured by Oji Paper Co., Ltd.). Surface roughness (Rz)
Was 3.06 μm. -Intermediate adhesive layer: An intermediate adhesive layer was formed in the same manner as in Example 1. -Surface layer: 16 g of anion-modified polyvinyl alcohol KL-318 (manufactured by Kuraray) as water-soluble resin and 184 g of water
To prepare a resin solution. An epoxy-based crosslinking agent (Denacol EX-313, manufactured by Nagase Kasei Co., Ltd.) is added to the resin solution.
3.2 g, 0.4 g of polyoxyethylene nonylphenyl ether, and 1 g of silica fine paper (Sylysia 450, manufactured by Fuji Silysia) were added, and the mixture was stirred for 15 minutes. The obtained liquid was applied on the intermediate adhesive layer with a bar coater,
C. for 2 hours to obtain a surface layer having a thickness of 9 .mu.m. The sheet thus obtained was used as sheet 4. The surface roughness (Rz) of the sheet 4 was 1.21 μm.

Example 5 A sheet was prepared in the same manner as in Example 1 except that the base material layer was changed from CF paper to Kinmari (manufactured by Hokuetsu Paper Mills Co., Ltd.). The surface roughness (Rz) of Kinmari was 19.85 μm. Surface roughness of sheet 5 (Rz)
Was 12.31 μm.

Example 6 A sheet was prepared in exactly the same manner as in Example 1, except that the base material layer was changed from CF paper to a PET sheet (Minolta, M100) whose surface was roughened by sandblasting. 6. The surface roughness (Rz) of the roughened PET sheet was 8.47 μm. The surface roughness (Rz) of the sheet 6 was 4.43 μm.

Comparative Example 1 A sheet was prepared in the same manner as in Example 1 except that the base material layer was changed from CF paper to mirror-coated platinum (cast, manufactured by Oji Paper Co., Ltd.). The surface roughness (Rz) of the mirror-coated platinum was 1.93 μm. The surface roughness (Rz) of the sheet 7 was 0.86 μm.

Comparative Example 2 A sheet was prepared in the same manner as in Example 1 except that the base material layer was changed from CF paper to embossed / textured (manufactured by Oji Paper Co., Ltd.). The surface roughness (Rz) of the emboss / texture was 22.75 μm. The surface roughness (Rz) of the sheet 8 was 15.14 μm.

Comparative Example 3 A sheet was prepared in the same manner as in Example 1, except that the base material layer was changed from CF paper to a PET sheet (M100, manufactured by Minolta Co., Ltd.). The surface roughness (Rz) of the PET sheet was 0.39 μm. The surface roughness (Rz) of the sheet 9 was 0.26 μm.

Comparative Example 4 A sheet was prepared in the same manner as in Example 4 except that the amount of the silica fine particle was changed from 1 g to 10 g. The surface roughness (Rz) of the sheet 10 is 2.96.
μm.

Evaluation (Image Removal Performance) A commercially available laser beam printer (LP-17) was applied to the recording materials obtained in the above Examples and Comparative Examples.
00; manufactured by Epson Corporation). The recording material on which the image was formed was subjected to image removal (ink removal) using the apparatus shown in FIG. The toner removal rate when the immersion time in water was 3 minutes was evaluated. A sample from which 95% or more of the toner was removed was rated as ◎, a sample from which 80% or more and less than 95% of the toner was removed was rated as ○, and a sample from which less than 80% of the toner was removed was rated as ×.

The operating conditions of the apparatus shown in FIG. 4 are as follows. The immersion time was changed by adjusting the paper passing speed.・ 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. ・ Rotation speed of the brush 30 cm / sec ・ Heat roller temperature 110 ° C.

(Durability) Using a commercially available laser beam printer (LP-1700; manufactured by Epson Corporation) and the apparatus shown in FIG.
After repeating the drying process 20 times, the rate of weight change was calculated to evaluate the durability. The rate of change was calculated using the following equation: ◎ for 5% or less, ○ for 10% or less, Δ for 20% or less, and x for further weight change. , △ and above were considered as acceptable. Rate of change (%) = ｛(weight of sheet in initial state−step 2)
The weight of the sheet after repeating 0 times) / the weight of the sheet in the initial state｝ × 100 Normally, the denominator in the above equation should be the weight of the surface layer, but the weight of the surface layer alone should be measured. Is difficult,
In this evaluation, the denominator was set to the weight of the sheet in the initial state in consideration that the thickness of the surface layer was basically the same because the film thicknesses were all uniform.

(Paper-passing property) Using a commercially available laser beam printer (LP-1700; manufactured by Epson Corporation), 100 sheets were set on a sheet feeder stacker to form an image. Double feed that occurs until all sheets are used and occurs before the end (the phenomenon of feeding multiple sheets simultaneously)
Was counted.も の: No double feed occurred, 一度: 1 to 4 double feeds, １〜: 5 to 9 double feeds, Δ: 10
Samples that were more than once were rated as x, and those that were more than Δ were passed.

(Surface Uniformity) Each sheet was prepared in A4 size, divided into 5 vertical blocks and 4 horizontal blocks as shown in FIG. 5, and the thickness of the central portion was measured with a micrometer. The maximum value and the minimum value of the film thickness are taken out of these 20 blocks, those with a difference of less than 1 μm are indicated by ◎; those of 1 μm or more and less than 3 μm are indicated by ○; those of 3 μm or more and less than 5 μm are indicated by Δ X, and × or more were accepted.

Table 1 summarizes the above evaluation results.

[Table 1]

In the examples, the measurement of the surface roughness and the film thickness was performed as follows. (Surface roughness) Using a stylus type surface roughness meter Surfcom 550A (manufactured by Tokyo Seimitsu Co., Ltd.), the tracing speed of the stylus: 0.3 mm /
s, Traversing Length: 2.5 mm, Cut off: 0.8.

(Thickness of Surface Layer and Intermediate Layer) For each layer, the thickness before application was subtracted from the thickness after application and drying. Note that a micrometer was used.

As described above, by changing the surface roughness of the substrate layer without using a large amount of fine particles to change the surface properties, a recording material having excellent durability and excellent image removal performance can be obtained. It can be seen that it can be obtained. Further, by setting the surface roughness of the base material layer to 3 to 20 μm, a recording material having excellent paper passing properties and little variation in physical properties was obtained. Although it was a sensitivity evaluation, the use of pulp paper was superior to the use of a plastic film as the base material layer in terms of texture, texture, and writing properties of the recording material.

[0080]

As described above, according to the recording material of the present invention, in a recyclable recording material having at least a base layer and a surface layer made of a water-swellable resin, the surface roughness of the base layer is reduced. By adjusting the surface roughness of the surface layer by adjusting the surface roughness, an excellent effect of improving the durability in repeated use can be obtained. Further, according to the recording material of the present invention, not only the printing material can be sufficiently removed, but also an excellent effect that it can be favorably used in a printing apparatus such as a copying machine or a printer can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an embodiment of a recording material.

FIG. 2 is a schematic sectional view showing another embodiment of a recording material.

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

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

FIG. 5 is a schematic diagram for explaining a method for evaluating the uniformity of the surface layer.

[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

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Toshimitsu Fujiwara 2-13-13 Azuchicho, Chuo-ku, Osaka-shi, Osaka F-term in Osaka International Building Minolta Co., Ltd. 4L055 AG18 AG64 AG80 AG85 AG87 AG93 AH02 AH37 AH49 AJ01 AJ04 BE09 EA27 FA30 GA10

Claims (3)

[Claims] 1. A recyclable recording material comprising at least a substrate layer and a surface layer, wherein the substrate layer has a surface roughness (R
A recording material, wherein the surface roughness of the recording material is adjusted by adjusting z). 2. The recyclable recording material according to claim 1, wherein the surface roughness (Rz) of the base material layer is 3 μm or more and 20 μm or less. 3. The recyclable recording material according to claim 1, wherein the base material layer is pulp paper.