JP2002365825A - Image receiving sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image receiving sheet with which a toner image can be formed by separably and removably holding the image without fixing the image like heretofore and consequently the held toners can be separated and removed and reutilized and also the toner image can be well formed and the formed toner image can be well held. SOLUTION: The image receiving sheet S for forming the toner image by removably sticking the toners T has a rugged surface with a multiplicity of continuous groove-like recessed parts R which are capable of accepting the toners T formed thereon and are capable of forming the toner image by removably sticking the toners T to the recessed parts R. The image receiving sheet is so formed that the toners sticking to the recessed parts R are protected by the projecting line parts P of the rugged surface of the image receiving sheet. The projecting line parts P are reinforced by reinforcing parts H for maintaining the posture.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image receiving sheet on which a toner image is formed so as to be removable.

[0002]

2. Description of the Related Art An image forming method for forming a toner image on an image receiving sheet has been practiced for a long time.

A typical one is an electrophotographic image forming method.

In electrophotographic image formation, an electrostatic latent image carrier such as a photoreceptor is charged to a predetermined potential, and the charged area is exposed to an image in accordance with document image information to form an electrostatic latent image. Then, the electrostatic latent image is developed using a developer to form a visible toner image. Further, the visible toner image is finally transferred to an image receiving sheet and fixed.

In addition to the above, without forming an electrostatic latent image,
A toner image is formed by directly adhering the toner on the image receiving sheet based on the original image information, and the toner image is fixed. Similarly, once the toner image is directly formed on the intermediate transfer body,
An image forming method of a direct recording type in which the image is transferred onto an image receiving sheet and fixed is also proposed.

It is difficult to separate the toner fixed on the image receiving sheet from the image receiving sheet, and it is difficult to reuse the toner and the image receiving sheet. Therefore, at present, the image receiving sheet on which the toner image is fixed is discarded when it becomes unnecessary.

[0007]

However, with today's information society, such toners and image receiving sheets are consumed in a large amount, and the energy required for the production and the amount of carbon dioxide emitted by the production increase. is there.

As a method of separating the toner from the image receiving sheet on which the toner image is fixed in order to reuse the image receiving sheet, a deinking method using an aqueous solution such as a surfactant is also known. A large amount of energy is required to remove moisture penetrating into the sheet.

Japanese Patent Application Laid-Open No. 2000-250249 discloses an image forming method for forming a toner image on an image receiving sheet, which employs an image receiving sheet having an uneven surface formed with a large number of concave portions capable of receiving toner as the image receiving sheet. A toner image is formed by removably attaching toner to the concave portion of the image receiving sheet irregular surface, and the toner adhered to the concave portion is protected by the convex portion of the image receiving sheet irregular surface. A non-fixing type image forming method and an image receiving sheet used for implementing the image forming method are proposed.

According to the non-fixing type image forming method and the image receiving sheet, it is possible to form an image by holding the toner image on the image receiving sheet so that the toner image can be separated and removed from the image receiving sheet without being fixed as in the related art. Thereby, the toner can be separated from the image receiving sheet on which the toner image is formed, and the toner and / or the image receiving sheet can be reused.

However, Japanese Patent Application Laid-Open No. 2000-25024
In the image receiving sheet disclosed in Japanese Patent Application Laid-Open No. 9-29, if the strength of the convex portion that protects the toner adhering to the concave portion and forming the toner image is too small, the convex portion easily falls down when an external force is applied thereto. And the toner cannot be sufficiently protected.

If the convex portion is too weak, the toner on the image receiving sheet may stick to the hand or the like, or the convex portion may significantly collapse or deform when the image receiving sheet on which the toner image is formed is discharged by a discharge roller or the like. Image is damaged.

On the other hand, if the convex portions are too weak, for example, when the image receiving sheets are stacked and stored in a sheet supply cassette or the like and separated and sent out one by one by a separating device, the separating device acts strongly, so that the convex portions are crushed and damaged. Thereafter, there is a problem that it is difficult to form a good toner image.

Therefore, the present invention can form an image by holding a toner image so as to be separable and removable without fixing the toner image as in the prior art. Therefore, the held toner can be separated and removed and reused. It is an object of the present invention to provide an image receiving sheet which can be formed well and can hold the formed toner image in a good condition.

[0015]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is an image receiving sheet for forming a toner image by detachably attaching toner, and has a continuous groove-shaped concave portion capable of receiving the toner. Having a large number of uneven surfaces, a toner image can be formed by removably attaching toner to the concave portions,
The protrusions on the concave and convex surface of the image receiving sheet are configured to protect the toner adhered to the concave portions, and the reinforcing portions for maintaining the posture of the convex portions (maintaining a posture such as hardly falling down or buckling). To provide an image receiving sheet reinforced by:

If the depth of the continuous groove-shaped concave portion (the height of the ridge portion) is too small, the adhered toner tends to peel off, and if it is too large, it becomes difficult to adhere the toner to the concave portion during image formation. Therefore, about 30 μm to 150 μm is appropriate.

The reinforcing portion may be formed continuously in the longitudinal direction of the convex portion or may be formed intermittently.

As the reinforcing portion, the following types (1) and (2) can be given as typical examples. (1) A portion in which at least a lower portion of the ridge following the bottom of the recess is formed thicker than an upper portion of the ridge.

Examples of the reinforcing portion include those having a trapezoidal shape, a triangular shape, a conide shape such as Mt. Fuji, a semi-elliptical shape, a hemispherical shape, etc. together with the ridge main body. In addition, those exhibiting the shape of one side portion at the center of left-right symmetry of these cross-sectional shapes can also be exemplified. In the latter case, it can be said that the reinforcing portion is provided only on one side of the ridge portion main body.
Because the difference in width between the lower or lower end and the upper or upper end of the ridge portion is small, the effect of reinforcement cannot be expected so much.
It is preferable that the lower part of the ridge is 1.2 times or more the upper part.

In any case, even if the bottom of the concave portion and the reinforcing portion following the concave portion form a concave curved surface, it is easy to remove the toner from the concave portion in order to reuse the image receiving sheet. Good.

If the radius of curvature of the concave curved surface is too small, the effect of reinforcement is small. Therefore, it is preferably 15 μm or more, more preferably 30 μm or more. (2) At least a portion where the upper end of the ridge is formed thicker than the upper part of the ridge below it.

As such a portion, it is preferable that the outer contour of the cross-sectional shape has a convex curved surface such as a circular shape or an elliptical shape in order to suppress the toner from being caught.

In the case of any of the reinforcing portions of the above (1) and (2), the reinforcing portion may be formed intermittently even if it is formed continuously in the longitudinal direction of the ridge. Is also good.

The following types can also be exemplified as the reinforcing portion.

That is, the reinforcing portion is formed at least between the ridges adjacent to each other with the recess interposed therebetween.
This is a rising portion from the bottom of the concave portion.

The upper end of the rising portion may be at the same height position as the upper end of the ridge portion. However, the upper end of the rising portion is easily removed from the concave portion in order to reuse the image receiving sheet. May be at a position lower than the upper end of the ridge.

In any case where the rising portion is provided, it is easy to remove toner from the concave portion in order to reuse the image receiving sheet or the like. And the lower part of the protruding portion may form a concave curved surface. Further, for the same reason, the bottom of the concave portion and the lower portion of the rising portion following the concave portion may form a concave curved surface.

Regardless of the type of the reinforcing portion, at least the material forming the concave portion and the convex portion reinforced by the reinforcing portion is a thermoplastic resin and / or cured by a predetermined process. Curable resin can be exemplified.

Examples of the thermoplastic resin include polyethylene, polypropylene, polystyrene resin, polycarbonate resin and polyethylene terephthalate resin. These resins may be used alone or as a mixture of two or more.

Examples of the thermosetting resin include an epoxy resin, a phenol resin, a melamine resin, and an unsaturated polyester resin.

Examples of the photocurable resin include acrylic, epoxy and ene / thiol resins. Acrylic oligomers include polyol-modified (meth) acrylate, polyether-modified (meth) acrylate, polyester-modified acrylate, and polyurethane-modified (meth)
Examples thereof include acrylate, epoxy-modified (meth) acrylate, and polyacetal-modified (meth) acrylate.

When a photocurable resin is employed, examples of the photopolymerization initiator include a hydrogen-abstraction type polymerization initiator (benzophenone, camphorquinone, etc.) and a photocleavable type (benzoin ethyl ether, 2,4,6-trimethyl). Benzoyldiphenyl phosphine oxide). Further, a sensitizer such as dimethylaminoethyl methacrylate, n-butylamine, triethylamine, and isoamyl 4-dimethylaminobenzoate may be used.

Examples of the electron beam-curable resin include epoxy-modified acrylate, polyurethane-modified acrylate, and acryl-modified polyester.

A typical example of a preferable curable resin is an epoxy resin. As the epoxy resin, any compound having two or more epoxy groups in one molecule can be employed from a wide range without being limited by the molecular structure, molecular weight and the like. For example, epoxy resins of aromatic type such as epoxy novolak type and biphenyl type, alicyclic type such as cyclohexane derivative, bisphenol A type and bisphenol F type epoxy resin can be mentioned.

As the material forming the concave portions and the convex portions, a biodegradable resin that is decomposed by moisture, bacteria, or the like when buried in the soil may be employed.

Examples of the biodegradable resin include resins of a chemical synthesis system, a microorganism production system, a natural product system and the like. Among them, it is particularly preferable to use a natural resin having a chemical structure close to the raw material of paper.

As the material forming the concave portions and the convex portions, a polymer in which a solvent evaporates and solidifies can be used.

Examples of the polymer that solidifies upon evaporation of the solvent include epoxy resins, acrylic resins, urethane resins, urethane / urea resins, and cellulose derivatives. These may be used alone or as a blend of two or more. Further, a curing agent may be added to these resins.

In any case, a material to which one or more fillers are added may be employed as a material for forming the concave portions and the convex portions. When a filler is added to the polymer resin, the physical properties of the polymer resin can be improved by the filler. It is preferable that the filler in the material forming the concave portions and the convex portions is added at a ratio of about 0.5 wt% to 50 wt%. The filler may be substantially uniformly dispersed in the material forming the concave portions and the convex portions, or may be unevenly distributed in portions near the surfaces of the concave portions and the convex portions.

Examples of the filler include inorganic fine particles and / or organic fine particles.

Further, reinforcing fibers can also be exemplified as the filler.

Further, examples of the filler include fine particles and / or fine fibers of cellulose or polymer particles.

Examples of the inorganic filler include calcium carbonate, barium carbonate, calcium sulfate, barium sulfate, magnesium hydroxide, magnesium oxide, titanium oxide, silica, talc, carbon black and the like.

Examples of the reinforcing fibers include glass fibers, aramid fibers, carbon fibers, ceramic fibers, boron fibers, alumina fibers, and silicon carbide fibers. The reinforcing fibers may be any of twisted yarn, untwisted yarn, non-twisted yarn and the like.
It is preferable to use carbon fiber because of its excellent strength and durability, but glass fiber, aramid fiber, boron fiber, alumina fiber, and silicon carbide fiber subjected to surface treatment may be used.

These fibers may be used alone or 2
A combination of more than one species may be used.

In any case, the filler may be subjected to a surface modification treatment such as a silane coupling treatment or a titanate coupling treatment in order to increase the affinity with the polymer. One or more additives such as an antistatic agent, a stabilizer, and a surface tension modifier may be added to a material such as a polymer that forms the concave and convex portions. The additive may be uniformly dispersed in the material, for example. The antistatic agent, the stabilizer, and the surface tension adjusting agent may be applied after forming an uneven surface with a material such as a polymer.

In the image receiving sheet, a layer made of a material forming the concave portions and the convex portions may be formed on a sheet substrate layer.

The base material layer has a basis weight of 25 g, for example.
/ M ^{2 to} 250 g / m ² of normal quality paper, recycled paper, recycled paper, RC coated with resin such as polyethylene
General paper or film such as paper can be used. Further, films such as a polyethylene film, a polypropylene film, and a polyethylene terephthalate film can be exemplified.

At least a part of the peripheral portion of the sheet surface including the uneven surface may be a margin portion having no concave portion and no convex portion.

By forming the margin portion in this manner, the image receiving sheet can be handled by using the margin portion without touching the uneven surface when handling the image receiving sheet. In the image receiving sheet on which the image can be formed and the toner image is formed, the damage of the toner image, the adhesion of the toner to a finger or the like can be suppressed.

The margin portion is desirably provided at least in a region where the separating device operates when the image receiving sheet is separated and fed by a separating device for separating and sending the image receiving sheets from the stacked image receiving sheets.

The image receiving sheet described above can be manufactured, for example, by the following method. 1. After the resin is melt-extruded onto the raw sheet base material that becomes the base material layer, a roller having an uneven pattern on the surface is relatively rolled on the resin on the base material surface, and the unevenness of the resin is applied to the sheet base material surface. A method of manufacturing an image receiving sheet by forming a surface. 2. A roller having an uneven pattern on its surface is heated in advance, and the roller is relatively rolled on a material sheet for an image receiving sheet to form an uneven surface on the sheet surface, thereby manufacturing an image receiving sheet. Method. 3. A method of manufacturing an image receiving sheet by using a sheet having a curable resin layer on its surface, forming the curable resin layer on the sheet surface into an uneven shape, and then curing it by a predetermined method to form an uneven surface.

As a method of curing the curable resin, for example, a method of curing using heat, light, or an electron beam depending on the resin can be used. Alternatively, a resin that cures when the solvent evaporates and dries may be used. 4. Extrusion port (nozzle) with holes of predetermined irregularities
A method of manufacturing an image receiving sheet by extruding a molten resin onto a sheet substrate to form an uneven surface on the sheet substrate. 5. A plate having a concave-convex pattern formed in advance is superimposed on a material sheet for an image receiving sheet, and heated and pressed by a hot press, and the concave-convex surface on the surface of the material sheet has concaves and convexes opposite to those formed on the plate. A method of manufacturing an image receiving sheet by forming a sheet.

When the uneven surface is embossed as in the above methods 1 and 2, a roller facing the roller having the uneven surface is used, and the embossing is performed so that a curved surface is formed along the roller. In the method 5 described above, if the plate is provided with a curvature in advance so that the uneven surface is inward, curling of the image receiving sheet after the uneven processing can be suppressed. Curling can also be suppressed by coating a resin, fine particles, or the like on a surface that is not subjected to uneven processing. By performing both of the above, the curl suppressing effect can be increased accordingly.

Any method other than the method described above may be used as long as it is a manufacturing method capable of providing irregularities of a predetermined width, pitch, and depth (height) on the surface and / or reinforcing portions.

In the case of an image receiving sheet having a rising reinforcing portion in a concave portion, a method of manufacturing by attaching a mesh material to a sheet substrate may be considered. In this case, as the mesh material, it is preferable to use a material composed of synthetic fibers, semi-synthetic fibers, natural fibers and the like.

The method for forming a non-fixed image on the image receiving sheet according to the present invention is, for example, as follows.

The image forming apparatus has, for example, a photoconductor,
A device in which a charging device, an image exposing device, a developing device, a transfer device, a cleaning device, and a charge removing device are arranged in this order around the photoreceptor is used.

Further, on the downstream side in the sheet conveying direction, there is provided a convex toner removing device for collecting the toner adhering to the sheet convex.

After uniformly charging the surface of the photoreceptor having the photoconductive layer in the charging device, exposure is performed in accordance with image data by an image exposure device to form an electrostatic latent image on the photoreceptor. Thereafter, toner particles (negative polarity) are adhered to the photoreceptor in accordance with the electrostatic latent image in a developing device, and development is performed.

The toner particles are transferred to the conveyed image receiving sheet by a transfer device.

Most of the toner particles transferred to the image receiving sheet adhere to concave portions on the sheet surface, but partially adhere to convex portions. The image receiving sheet onto which the toner image has been transferred is conveyed to the convex part cleaning device, and the toner particles adhered to the convex parts are collected by electrostatic force with a collecting brush, and an image is formed.

The toner remaining on the photoreceptor is removed by the cleaning device, and thereafter, the photoreceptor is discharged by the discharging device.

An image forming apparatus using this image receiving sheet is:
The image forming apparatus can be a hybrid type image forming apparatus with an image forming apparatus using an electrophotographic method, and the components can be shared, which is advantageous in reducing the cost and size of the image forming apparatus.

A hybrid image forming apparatus may be constructed by providing a writing head or the like dedicated to an image receiving sheet in an electrophotographic image forming apparatus.

For example, an image carrier having a dielectric layer in place of the photoreceptor is used, an electrostatic latent image is formed by an ion flow multi-stylus method or the like, and toner particles are developed and transferred to an image receiving sheet. May be used to form an image.

Further, an image may be formed by selectively attaching toner particles directly to an image receiving sheet. (Toner jet method) An electrostatic latent image can be formed directly on an image receiving sheet by an ion flow multi-stylus method or the like, and then developed by a developing device to form an image.

According to the present invention, an image can be formed by holding a toner image in a separable and removable manner without fixing the toner image as in the prior art. Therefore, the held toner can be separated and removed and reused. It is possible to provide an image receiving sheet that can be satisfactorily formed and can hold the formed toner image satisfactorily.

[0069]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a perspective view and an enlarged sectional view of an example of the image receiving sheet.

The image receiving sheet S is as shown in FIG.
An image receiving layer S2 made of synthetic resin is formed on one side of a sheet base material S1 made of paper, and is entirely white. In FIG. 1B, T is an exaggerated toner.

The image receiving layer S2 has a continuous groove-shaped concave portion R for storing the toner T and a convex portion P for protecting the toner T stored in the concave portion R. In the image receiving sheet S, the concave portions R and the ridge portions P of the image receiving layer S2 are formed in parallel with the sheet feeding direction Y (see FIG. 1A). Note that the sheet feeding direction Y is a direction in which a sheet is fed in forming a non-fixed image on the image receiving sheet S described later.

If the depth C of the recess R (the height of the ridge P) is too small, the adhered toner T tends to peel off, and if it is too large, it becomes difficult to adhere the toner T to the recess P in image formation. Therefore, the height C is suitably about 30 μm to 150 μm. The range of the height C is the same in other image receiving sheet examples described below.

The ridge P of the image receiving layer S2 has a width A1 of the upper Pu.
The width A2 of the lower part Pd is formed thicker,
The portion providing the thickness of d forms a reinforcing portion H that suppresses the ridge P from being deformed such as collapse or buckling.
However, if the difference between the width A1 of the upper Pu and the width A2 of the lower Pd is small, the effect of the reinforcing portion H that suppresses the deformation of the ridge P decreases. Therefore, the upper width A1 and the lower width A2 are A2
It is preferable to have a relationship of ≧ 1.2 · A1.

In the image receiving sheet S, the average width B of the concave portions R of the image receiving layer S2 is about 15 μm to 400 μm, the average width A of the convex portions P is about 5 μm to 50 μm, and the depth of the concave portions R (the convex portions P Is about 30 μm to 150 μm. Further, the average width A of the projections P is not more than half and not more than 1/50 of the average width B of the depressions R.

In the image receiving sheet S, the concave portions R and the convex portions P in the image receiving layer S2 are uniformly arranged, and the total area occupied by the concave portions R in the concave and convex surface S21 of the image receiving layer S2 is equal to the convex portions P.
Is larger than the total area occupied by the toner particles, and each recess R is deeper and wider than the average particle diameter of the toner described later, and can receive a plurality of toners therein.

The image receiving sheet S shown here is a two-layer laminated sheet in which an image receiving layer S2 is laminated on a sheet substrate S1, but may be an image receiving sheet in which two or more layers are laminated. It may be a single-layer sheet.

Although the image receiving sheet of this embodiment is white, it is not limited to white, and may be another color according to the color of the toner.

As the material forming the image receiving layer S2 (the material forming the concave portions and the convex portions), the above-described thermoplastic resin and / or a curable resin which is cured by a predetermined process can be used. .

Further, as the material forming the image receiving layer S2, the above-described biodegradable resin which is decomposed by moisture, bacteria, and the like when buried in the soil can be used.

As the material forming the image receiving layer S2, a polymer of the type in which the solvent evaporates and solidifies as described above can be used.

In any case, the material for forming the image receiving layer S2 contains one or more of the aforementioned fillers in an amount of 0.5 wt% to 5 wt%.
You may add in the ratio of 0 wt%.

The filler may be subjected to a surface modification treatment such as a silane coupling treatment and a titanate coupling treatment.

The material of the image receiving layer S2 includes an antistatic agent,
One or more additives such as stabilizers and surface tension adjusters may be added. These may be applied after forming the uneven surface.

The image receiving sheet S may be one in which a layer S2 made of a material forming the concave portions and the convex portions is laminated on a sheet base material layer.

[0086] As the sheet substrate S1, for example, it can be used paper or film described above having a basis weight of ^{25g / m 2 ~250g / m 2} . Furthermore, polyethylene film,
A polypropylene film, a polyethylene terephthalate film, or the like can also be used.

FIG. 2 shows a perspective view and an enlarged sectional view of another example of the image receiving sheet.

Members having substantially the same shape and effect as the image receiving sheet S are denoted by the same reference numerals.

The image receiving sheet Sa has the same basic structure as the image receiving sheet S, as shown in FIG. That is,
An image receiving layer Sa2 made of synthetic resin is formed on one side of a sheet base material S1 made of paper, and the whole is white.

The image receiving layer Sa2 has a concave portion R for containing the toner T.
The bottom Rf2 and the ridge P2 form a concave curved surface Ow. As with the concave curved surface Ow, similarly to the case where the lower part of the ridge P of the image receiving sheet S is formed thick, the reinforcing portion H2 for suppressing the ridge P2 from being deformed such as collapse or buckling is provided. Make up. However, when the radius of curvature r of the concave curved surface Ow is small, the effect as the reinforcing portion is reduced. Therefore, the radius of curvature r of the concave curved surface Ow is preferably in the range of r ≧ 15 μm, and more preferably in the range of r ≧ 25 μm.

Further, the convex portion P2 and the bottom portion Rf2 of the concave portion R2 are formed.
Is formed on the concave curved surface, the toner T is more easily removed by the toner removing unit than the concave portion R of the image receiving sheet S.

The shape of the convex portion of the image receiving sheet is not limited to the above, and examples thereof include those having a triangular cross section, a conide shape such as Mt. Fuji, a semielliptical shape, and a hemispherical shape.

The lower part of the ridge having various cross-sectional shapes as described above may form a concave curved surface with the bottom of the concave.

In addition, there can also be exemplified those exhibiting the shape of one side portion at the center of left-right symmetry of the cross-sectional shape of these ridges including the above two examples. In this case, the reinforcing portion is provided only on one side of the ridge portion main body.

Further, a reinforcing portion having different cross-sectional shapes on the left and right may be used. For example, the convex portion may have a semi-trapezoidal shape on the right side and a concave shape on the left side. In this case, a reinforcing portion having different effects on the left and right is provided on the ridge portion main body.

FIG. 3 shows a perspective view and an enlarged sectional view of still another example of the image receiving sheet. Members substantially the same as those of the image receiving sheet S are denoted by the same reference numerals.

The image receiving sheet Sb has the same basic configuration as the image receiving sheet S as shown in FIG. That is, the image receiving layer Sb2 made of a synthetic resin is formed on one side of a sheet base material S1 made of paper, and the whole is white.

The image receiving layer Sb2 has a concave portion R for containing the toner T.
3 and a ridge P protecting the toner T stored in the recess R3.
3 is provided. The protruding ridge portion P3 has a reinforcing portion H3 having an elliptical cross section extending continuously in the longitudinal direction at the upper end portion Pu3.

The reinforcing portion H3 is formed thicker than the portion of the ridge P3 where the reinforcing portion is not formed. This makes it difficult for the ridge P3 to be deformed such as collapse or buckling.

In the image receiving sheet Sb, the reinforcing portion H3 is formed continuously in the longitudinal direction of the ridge P3, but may be formed intermittently as long as it has an effect of sufficiently suppressing deformation. .

In the image receiving sheet Sb, the reinforcing portion H3 has an elliptical cross section, but the present invention is not limited to this, and the shape is not particularly limited as long as it is thicker than the width of the ridge P3 such as a circular cross section. However, the outer surface is preferably rounded in order to suppress the toner from being caught.

In the image receiving sheet Sb, the reinforcing portion H3 is provided at the upper end Pu3 of the ridge P3.
The present invention is not limited to this, and may be provided at a position lower than the upper end of the ridge P3.

The lower part of the ridge provided with the reinforcing portion H3 of the image receiving sheet Sb may be formed thicker than the upper part, or may form a concave curved surface with the bottom of the concave.

FIG. 4 shows a perspective view, an enlarged sectional view and a partial plan view of still another example of the image receiving sheet. Members having substantially the same shape and effect as the image receiving sheet S are denoted by the same reference numerals.

The image receiving sheet Sc has the same basic structure as the image receiving sheet S as shown in FIG. That is, an image receiving layer Sc2 made of a synthetic resin is formed on one surface of a sheet base material S1 made of paper, and the whole is white.

The image receiving sheet Sc rises in a direction perpendicular to the convex portion P4 in the concave portion R4, the convex portion P4 for protecting the toner T stored in the concave portion R4, and the pitch. Reinforcement H installed in PT
4 (see FIG. 4C).

In FIG. 4, the reinforcing portions H4 are installed such that adjacent reinforcing portions are arranged in a straight line. However, a part or all of the reinforcing portions H4 may be arranged at different positions for each concave portion R4.

[0108] The ridge P4 is not limited to this, but here the one having the same upper and lower width is employed. The reinforcing portion H4 connects two adjacent ridges P4,
This suppresses the ridge P4 from deforming such as collapse and buckling.

The reinforcing portion H4 is formed integrally with the ridge P4, has the same rectangular cross section, and has the same height as the ridge P4.

The height of the reinforcing portion may be lower than the height of the ridge if the deformation of the ridge can be sufficiently suppressed.

The reinforcing portion H4 is arranged so as to be orthogonal to the ridge P4, but may be installed so as to obliquely intersect the ridge P4.

When the reinforcing portion H4 is provided in the concave portion R4, it is preferable that the ridge portion and the bottom of the concave portion form a concave curved surface. It is more preferable that the reinforcing portion and the bottom of the concave portion also form a concave curved surface.

FIG. 5 shows a perspective view, an enlarged sectional view and a plan view of still another example of the image receiving sheet. Substantially image receiving sheet S
Members having the same shape and effect as those described above are denoted by the same reference numerals.

The image receiving sheet Sd has the same basic structure as the image receiving sheet S as shown in FIG. That is, the image receiving layer Sd2 made of a synthetic resin is formed on one side of a sheet base material S1 made of paper, and the whole is white.

The image receiving sheet Sd has a concave portion R5 for accommodating the toner T, a convex portion P5 for protecting the toner T contained in the concave portion R5, and a hemispherical shape divided into convex portions P5 below the convex portion P5. Is provided.

The reinforcing portion H5 has a central portion penetrated by the ridge P5 and is intermittently arranged at a pitch PT '(see FIG. 5C).

The shape of the reinforcing portion H5 of the image receiving sheet Sd is hemispherical, but is not limited thereto.
Any shape can be used as long as it is hard to fall down. For example, a rectangular parallelepiped shape, a quadrangular pyramid shape, or the like can be given.

In FIG. 5, the reinforcing portions for reinforcing different ridges are arranged in a direction perpendicular to the longitudinal direction of the ridges, but the present invention is not limited to this. Any arrangement can be used as long as the deformation of can be suppressed.

FIG. 6 shows a schematic configuration of an example of an image forming apparatus for forming a non-fixed image on a non-fixed type image receiving sheet.

The image forming apparatus AP1 shown in FIG. 6 is provided with a convex cleaning device 3 for removing toner adhering to the convex ridges on the concave and convex surface of the image receiving sheet.

The image forming apparatus AP1 further includes a toner image forming apparatus 1 for forming a toner image on the image receiving sheet S.
And a sheet cleaning device 2 for removing a toner image already formed on an image receiving sheet before an image is formed by the toner image forming device 1.

When an image is formed on the uneven surface of the image receiving sheet by the image forming apparatus AP1, the image receiving sheet is conveyed on a predetermined sheet conveying path while being guided by the guide member G1 and the like. The image receiving sheet is, for example, a sheet tray (not shown) for storing a plurality of image receiving sheets, and a discharge tray (not shown) for storing a sheet on which an image has been formed.
Is formed, and an image is formed on the running image receiving sheet.

The image receiving sheet is conveyed at a predetermined speed by a pair of rollers r1 to r3 arranged at a position facing the sheet conveying path. When the image receiving sheet is conveyed, in this example, the roller pair r1 to r3 is driven at a predetermined speed in a predetermined direction by a motor MT1 via a driving force transmission mechanism (a drive train including a gear and / or a belt) not shown. Is driven to rotate. In this example, the photoconductor 11 and the transfer roller 15 are also connected to the motor M via a driving force transmission mechanism (not shown).
It is rotationally driven by T1.

The image receiving sheet conveyed at the predetermined sheet conveying speed in this manner is subjected to a cleaning process by the sheet cleaning device 2, a toner image forming process by the toner image forming device 1, and a convex portion cleaning device 3 by the convex portion cleaning device 3. Processing is sequentially performed. Hereinafter, the operation of each apparatus when forming an image on the image receiving sheet S shown in FIG. 1 will be described.

First, the image receiving sheet S is subjected to the following cleaning processing by the sheet cleaning device 2. The sheet cleaning device 2 is for removing toner adhering to the concave and convex portions of the uneven surface of the image receiving sheet. In some cases, a toner image has already been formed on the uneven surface of the image receiving sheet. The toner image is removed from the uneven surface to prepare for toner image formation by the toner image forming apparatus 1.

The sheet cleaning device 2 includes a power supply PS2
, And a platen roller 22 grounded. The brush roller 21 is supplied with a bias voltage having a polarity opposite to the charging polarity (negative in this example) of the toner T on the uneven surface S21 of the image receiving sheet S by the power supply P.
Applied from S2. The toner T adhered to the concave portions R and the convex ridges P of the uneven surface S21 of the image receiving sheet S can be removed by the electrostatic force by the bias voltage.

Thus, the charged toner on the image receiving sheet S can be easily removed by electrostatic force. Since the toner constituting the toner image is only adhered to the uneven surface S21 of the image receiving sheet S and the fixing is not performed, the toner can be easily removed in this manner. Thus, the image receiving sheet S can be reused many times for image formation. The toner removed from the image receiving sheet S may be reused for forming a toner image by the toner image forming apparatus 1.

After the toner on the image receiving sheet S has been removed,
A toner image is formed on the image receiving sheet by the toner image forming apparatus 1.

The toner image forming apparatus 1 can form a toner image on an image receiving sheet by an electrophotographic method. The toner image forming apparatus 1 has a photoconductor 11, and the photoconductor 11
Around the charging device 12, the exposure device 13, and the developing device 1.
4, a transfer device 15 and a cleaning device 16 are arranged.

When a toner image is formed on the image receiving sheet S, first, the surface of the photoreceptor 11 is uniformly charged to a predetermined potential by the charging device 12. In this example, the photoconductor 11
Is charged to about -900V. Next, the exposure device 13 (in this example, a laser device) exposes the surface of the photoconductor 11 charged in accordance with the document image, thereby attenuating the potential of the exposed surface of the photoconductor. In this example, the potential of the surface of the photoconductor irradiated with light attenuates to about -100V. As a result, an electrostatic latent image corresponding to the document image is formed on the surface of the photoconductor 11. The electrostatic latent image is developed by the developing device 14 using charged toner of a predetermined polarity (in this example, negatively charged toner), so that a toner image corresponding to a document image is formed on the photoconductor 11. In the developing device 14, an electrostatic latent image is developed by applying a developing bias voltage (about -350V in this example) to the developing roller 141 that holds the charged toner. The toner image formed on the photoconductor 11 is transferred onto the image receiving sheet S by a transfer device 15 having a transfer roller 151 facing the photoconductor 11. At this time, a transfer bias voltage having a polarity opposite to the charge polarity (negative polarity in this example) of the toner on the photoconductor 11 is applied to the transfer roller 151, and the toner image on the photoconductor 11 is changed by the bias voltage. It is electrostatically transferred onto the uneven surface S21 of S. The toner remaining on the photoconductor 11 without being transferred is removed from the photoconductor 11 by the cleaning blade 161 of the cleaning device 16. The toner removed from the photoconductor 11 may be reused for development by the developing device 14 (formation of a toner image by the toner image forming device 1).

As described above, the uneven surface S2 of the image receiving sheet S
When a toner image is formed on the surface 1, if the toner image is located at a position corresponding to the convex portion, the toner will adhere to the convex portion. When the image receiving sheet S comes into contact with another article (for example, a person's finger or another image receiving sheet), the toner adhering to the ridges P tends to transfer to the article, and tends to stain the article. To suppress this, the toner adhering to the protrusions is removed by the protrusion cleaning device 3.

The convex cleaning device 3 includes a cleaning roller 31 disposed at a position facing the sheet conveying path,
It has a platen roller 32. These rollers 31 and 32 are arranged at fixed positions. Rollers 31 and 32
Are metal rollers in this example, and are grounded. The image receiving sheet S passes between the cleaning roller 31 and the platen roller 32. At this time, the toner adhering to the ridges P of the image receiving sheet S is removed while the cleaning roller 31 is in contact with the convex tops of the uneven surface S21 of the image receiving sheet S.

When the toner adhering to the ridges P of the image receiving sheet S is to be removed (when the ridge cleaning is performed), the image receiving sheet S is conveyed at a predetermined sheet conveying speed by the driving device including the motor MT1. . Since the cleaning roller 31 is arranged at a fixed position, the image receiving sheet S moves at a predetermined sheet conveyance speed with respect to the cleaning roller 31. More specifically, the uneven surface S2 including the convex portion of the image receiving sheet S is provided with respect to the cleaning roller 31.
1 moves at a predetermined surface speed (= predetermined sheet conveyance speed).

When performing the convex cleaning,
The cleaning roller 31 is driven to rotate in a predetermined direction at a predetermined speed. The cleaning roller 31 is driven to rotate by a motor MT1 via a driving force transmission mechanism (not shown). Thus, when performing the convex part cleaning, the contact surface of the cleaning roller 31 with the image receiving sheet is moved in a predetermined direction at a predetermined surface moving speed.

The cleaning roller 31 may be driven to rotate clockwise in the figure, or may be driven to rotate counterclockwise. That is, the cleaning roller 31 may be rotated clockwise in the figure to move the surface thereof in the contact area with the image receiving sheet in the direction opposite to the conveying direction of the image receiving sheet, or alternatively, the cleaning roller 31 may be rotated counterclockwise in the figure. It may be rotated around and its surface may be moved in the same direction as the conveying direction of the image receiving sheet in the contact area with the image receiving sheet.
The platen roller 32 may be driven to rotate, for example, according to the movement of the image receiving sheet.

Thus, the surface of the cleaning roller 31 which is driven to rotate in the predetermined direction is brought into contact with the ridge P of the uneven surface S21 of the image receiving sheet S conveyed in the predetermined direction, and the ridge P is rubbed by the roller surface. Thus, the toner T adhering to the convex portions is removed. The toner removed from the cleaning roller 31 may be reused for forming a toner image by the toner image forming apparatus 1.

In the above-described method and apparatus for cleaning a convex portion, even if the cleaning roller surface is moved in the same direction as the moving direction of the surface of the image receiving sheet (the sheet conveying direction in this example) or in the opposite direction. A speed difference is provided between the surface moving speed of the cleaning roller 31 on the contact surface with the image receiving sheet and the surface moving speed of the image receiving sheet being conveyed. Typically, the moving speed of the cleaning roller surface is set higher than the surface moving speed of the image receiving sheet.
In the image forming apparatus AP1, the reduction ratio of the driving force transmission mechanism for conveying the image receiving sheet, which is connected to the roller pairs r1 to r3, etc. from the motor MT1, and the motor MT1
By adjusting the relationship between the speed reduction ratio in the driving force transmission mechanism for rotating and driving the cleaning roller 31 connected to the cleaning roller 31, the speed difference between the surface moving speed of the image receiving sheet and the surface moving speed of the cleaning roller is adjusted. Is provided.

By providing such a speed difference, the toner adhering to the convex portions is suppressed while the toner image formed by the toner adhering to the concave portions of the image receiving sheet is prevented from being disturbed. Can be removed.

In FIG. 6, the image receiving sheet S is conveyed in a direction intersecting the direction in which the ridge P extends.
The image receiving sheet S may be conveyed in the direction in which the ridges P extend. When the image receiving sheet S is transported in the direction in which the ridges P extend, better cleaning of the ridges can be performed than when the image receiving sheet S is transported in the crossing direction.

In the toner image on the toner image forming image receiving sheet S, the toner constituting the toner image enters the concave portion R of the concave and convex surface S21 of the image receiving sheet, and is protected by the ridge P of the concave and convex surface. Therefore, the toner image formed on the image receiving sheet is not required to be subjected to a fixing process by heating or the like as in the conventional image forming method unless a special external force is applied. The state of the image can be maintained. Significant disturbance of the toner image due to slight external force such as contact between the image receiving sheets in the case of viewing the toner image on the image receiving sheet, storing the image receiving sheet, or simply moving the image receiving sheet, or light finger contact with the image receiving sheet Inconveniences such as adhesion of toner to the back surface of the image receiving sheet superposed thereon do not occur.

Further, since the toner on the image receiving sheet is only removably adhered, the toner can be separated and removed again, and the toner separated and removed in this way and the image receiving sheet from which the toner has been removed can be reused.

Next, an image forming experiment was performed using the image receiving sheet. An experimental example will be described.

First, eight kinds of image receiving sheets and one kind of image receiving sheet for comparison were prepared as samples used in the experiment. [Comparative Example 1] Image receiving sheet without reinforcing portion A continuous line groove having a width of 20 µm, a pitch of 100 µm, and a depth of 50 µm was subjected to dicer processing on a silicon wafer to form a plate. A low-density polyethylene film (40 μm) is superimposed on plain paper, and the plate is further superimposed thereon, and hot-pressed (105 ° C., 10 kg / cm).
^By applying heat and pressure in ² ), an image receiving sheet having a continuous linear groove formed on the surface was produced. [Example 1] Image receiving sheet having a trapezoidal cross-section convex ridge portion A frontage width of 30 µm and a bottom width of 10 µm on a silicon wafer
A continuous linear groove having a trapezoidal cross section of m, a depth of 50 μm, and a pitch of 100 μm was subjected to dicer processing to form a plate mold. Low-density polyethylene film (40
[mu] m) Lap, further on overlapped the plate type from the hot press ^{(150 ℃, 10kg / cm 2} ) at a heating and pressing, receiving with a continuous line-shaped groove cross section is a trapezoid surface A sheet was prepared. [Embodiment 2]... Image receiving sheet in which the lower part of the ridge and the bottom of the dent following the ridge are formed into a concavely curved surface. The surface of the metal plate is etched by a width of 80 μm and a depth of 40.
A continuous linear groove having a thickness of 100 μm and a pitch of 100 μm was prepared, and this was used as a matrix. Next, use silicone rubber (TSE350 / C
E62 GE manufactured by Toshiba Silicone Co., Ltd.) to produce a plate. A low-density polyethylene film (40 μm) is stacked on plain paper, and the silicon plate mold is further stacked on the low-density polyethylene film, and hot-pressed (150 ° C., 10 kg
/ Cm ² ) by heating and pressing at the bottom with a radius of 40μ.
An image receiving sheet having a continuous linear groove with a curved surface of m was prepared. [Embodiment 3] An image receiving sheet having an elliptical cross-section reinforcing portion at the tip of the ridge portion 20 μm on a silicon wafer, pitch 100 μm, depth 5
A continuous linear groove of 0 μm was subjected to dicer processing, and this was used as a plate mold. A low-density polyethylene film (40 μm) is placed on plain paper, and the plate is placed on top of it, and hot pressed (150 ° C., 10 kg / c).
By heating and pressurizing at m ² ), an uneven sheet having continuous linear grooves on the surface was produced. In order to make the tips of the ridges arranged in a line into an elliptical cross-section, an epoxy resin (viscosity, 1000 mPa · s) is applied to the tips of the ridges using a roll coater known per se, and then cured to form a convex. An image receiving sheet having a ridge having an elliptical columnar reinforcement at the tip of the ridge and a continuous linear groove adjacent to the ridge was prepared. [Example 4] Image receiving sheet having rib-shaped reinforcement portions A metal plate surface was etched to have a diameter of 40 µm and a depth of 3
A 0 μm hemispherical hole was machined at a 100 μm pitch.
After that, a width of 20 μm, a pitch of 100 μm,
A continuous concave groove having a depth of 50 μm was diced so as to pass through the center of the above-mentioned etching hole, thereby producing a plate mold.

Next, a low-density polyethylene foil was placed on plain paper.
Film (40 μm), and then the plate mold
And hot pressing (150 ° C, 10kg /
cm ^TwoBy heating and pressing in), the rib-shaped reinforcement
And a continuous linear groove adjacent to it
An image receiving sheet was prepared. [Example 5] ....
Image receiving sheet Silicon wafer, width 20μm, pitch 100μm, depth
Dicing a continuous 50 μm linear groove, the groove
20 μm, pitch 100 μm, depth
Dicer processing of 50μm linear groove is used as plate mold.
did.

Next, a low-density polyethylene foil was placed on plain paper.
Film (40 μm), and then the plate mold
And hot pressing (150 ° C, 10kg /
cm ^TwoBy heating and pressurizing in), ridges and protrusions are formed on the surface.
An image receiving sheet having a rising reinforcement section perpendicular to the ridge
Produced. [Embodiment 6] ...
Image receiving sheet The metal plate surface is etched by a width of 80 μm and a depth of 50 μm.
Create continuous linear grooves with a pitch of 100 μm
A width of 80 μm and a pitch of 100 μm in a direction perpendicular to the groove.
m, continuous line-shaped groove with depth of 50μm
This is used as a matrix, and silicone rubber (TSE350 / C
E62 GE Toshiba Silicone Co., Ltd.)
A plate was prepared.

Next, a low-density polyethylene film (40 μm) was superimposed on plain paper, and the plate was superimposed thereon, and hot press (150 ° C., 10 kg / c) was performed.
By applying heat and pressure at m ² ), an image-receiving sheet was produced in which a groove having a ridge on its surface and a rising reinforcement perpendicular to the ridge was formed.

The lower part of the ridge and the bottom of the recess following this, and the lower part of the rising part and the bottom of the recess following this each had a concave curved surface. [Embodiment 7] An image receiving sheet in which a concave portion has been processed to have a reinforcing portion, the width of which is 80 μm and the depth is 50 by etching the metal plate surface.
A continuous linear groove having a width of 480 μm and a pitch of 500 μm was formed in a direction perpendicular to the groove.
A continuous line-shaped groove having a depth of 50 μm and a depth of 50 μm is processed by dicing, and this is used as a matrix, and silicon rubber (TSE350 /
The plate was prepared by molding the mother die using CE62 GE Toshiba Silicone Co., Ltd.).

Next, a low-density polyethylene film (40 μm) was placed on plain paper, and the plate was placed on the low-density polyethylene film, and hot-pressed (150 ° C., 10 kg / c).
By heating and pressurizing at m ² ), an image receiving sheet having a ridge on the surface and a rising reinforcement perpendicular to the ridge was prepared.

The lower part of the ridge and the bottom of the recess following this, and the lower part of the rising part and the bottom of the recess following this each had a concave curved surface. [Embodiment 8] An image receiving sheet in which a concave portion is provided with a raised reinforcing portion, a width of 80 μm and a depth of 50 are etched on the surface of the metal plate.
A continuous linear groove having a width of 1980 μm and a pitch of 20 μm was formed in a direction perpendicular to the groove.
A continuous line-shaped groove having a diameter of 00 μm and a depth of 50 μm was processed by dicing, and this was used as a matrix, and silicon rubber (TSE35) was used.
0 / CE62 GE Toshiba Silicone Co., Ltd.) to obtain a mold.

Next, a low-density polyethylene film (40 μm) was placed on plain paper, and the plate was placed on the low-density polyethylene film, and hot-pressed (150 ° C., 10 kg / c).
By heating and pressurizing at m ² ), an image receiving sheet having a ridge on the surface and a rising reinforcement perpendicular to the ridge was prepared.

The lower part of the ridge and the bottom of the recess following this, and the lower part of the rising part and the bottom of the recess following this each had a concave curved surface. These nine samples were evaluated for applicability of the image receiving sheet using the following evaluation method. [Evaluation] [Evaluation of smearing property] A 100% solid image was output to each sheet sample using an image forming apparatus, and the sheet surface was printed on plain paper (5
Rubbed 5 times (under a pressure of 0 g / cm2). Then, the luminous reflectance (%) of the surface of the plain paper rubbed with the sheet was measured using a spectrophotometer C.
It was measured with M-3700d (manufactured by Minolta).

The value shown in the following equation was adopted as the smear evaluation value.

Smear evaluation value = 1− (reflectance (%) of plain paper after rubbing sheet / reflectivity (%) of plain paper before rubbing sheet) , 0.1 or more was evaluated as x.

[Evaluation of Cleaning] A 100% solid image was output to each sheet sample by the image forming apparatus, and the toner on the sheet was cleaned with a dedicated cleaning apparatus. At this time, る も の indicates that the image was completely erased by one cleaning, △ indicates that the image was completely erased by two cleanings, and X indicates that the image was not completely erased by two cleanings.

Table 1 summarizes the results of each evaluation.

[0156]

[Table 1]

In the smear evaluation, the evaluation value could not be cleared only for the image receiving sheet of Comparative Example 1 having no reinforcing portion. This is because, since there is no reinforcing portion, when the paper is strongly rubbed, the ridge portion is deformed, and the toner in the concave portion adheres to the paper.

In the evaluation of the cleaning properties, only the image-receiving sheet of Experimental Example 5 required two cleanings to completely erase the image, but in other cases, the image could be completely erased by one cleaning. did it. This is because the ridges and the rising reinforcements of Experimental Example 5 intersect perpendicularly with the bottoms of the recesses and do not form a concave curved surface at the bottoms of the recesses, so that the toner is not easily scraped off. .

[0159]

According to the present invention, it is possible to form an image by holding a toner image in a separable and removable manner without fixing the toner image as in the prior art. Therefore, the held toner can be separated and removed for reuse. It is possible to provide an image receiving sheet capable of favorably forming an image and holding the formed toner image favorably.

[Brief description of the drawings]

FIG. 1 is a perspective view of an example of an image receiving sheet according to the present invention, and FIG. B is an enlarged sectional view.

FIG. 2A is a perspective view of another example of the image receiving sheet according to the present invention, and FIG. 2B is an enlarged sectional view.

FIG. 3A is a perspective view of still another example of the image receiving sheet according to the present invention, and FIG. 3B is an enlarged sectional view.

4A is a perspective view of still another example of the image receiving sheet according to the present invention, FIG. B is an enlarged sectional view, and FIG. C is a partial plan view.

5 is a perspective view of still another example of the image receiving sheet according to the present invention, FIG. B is an enlarged sectional view, and FIG. C is a partial plan view.

FIG. 6 is a schematic configuration diagram of an image forming apparatus for forming a non-fixed image on an image receiving sheet according to the present invention.

[Explanation of symbols]

 S Image receiving sheet 1 Toner image forming device 11 Photoconductor 12 Charging device 13 Image exposure device 14 Developing device 15 Transfer device 151 Transfer roller 16 Cleaning device 161 Cleaning blade 2 Sheet cleaning device 21 Conductive brush roller 22 Platen roller 3 Convex portion cleaning device 31 Cleaning roller 32 Platen roller G1 Guide r1, r2, r3 Roller pair T Toner Sa, Sb, Sc, Sd Image receiving sheet P, P2, P3, P4, P5 Convex parts R, R2, R3, R4, R5 Recess H, H1, H2, H3, H4, H5 Reinforcement

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Nozomi Youme 2-3-3 Azuchicho, Chuo-ku, Osaka-shi, Osaka Inside Osaka International Building Minolta Co., Ltd. (72) Inventor Hiroshi Mizuno Chuo-ku, Osaka-shi, Osaka 2-3-3 Azuchicho Osaka International Building Minolta Co., Ltd. (72) Inventor Masafumi Yamamoto 2-3-3 Azuchicho, Chuo-ku, Osaka-shi, Osaka Osaka International Building Minolta Co., Ltd. (72) Inventor Masaharu Kanazawa 2-13-13 Azuchicho, Chuo-ku, Osaka-shi, Osaka F term in Osaka International Building Minolta Co., Ltd. (reference) 2H134 PA01 PA08 PE05 4F100 AK01A AK04 AK42 AT00B BA02 DD01A DD05A DG10B EJ39A

Claims (17)

[Claims] An image receiving sheet for forming a toner image by adhering toner in a removable manner, having an uneven surface formed with a large number of continuous groove-shaped concave portions capable of receiving the toner, wherein the toner is contained in the concave portions. A toner image can be formed by being removably attached to the image receiving sheet, and the convex portion of the concave and convex surface of the image receiving sheet is configured to protect the toner attached to the concave portion, and the convex portion is a reinforcing portion for maintaining a posture. An image receiving sheet characterized by being reinforced by: 2. The depth of the continuous groove-shaped recess (the height of the ridge).
The image receiving sheet according to claim 1, wherein the particle size is 30 μm to 150 μm. 3. The image receiving apparatus according to claim 1, wherein the reinforcing portion is a portion in which at least a lower portion of the convex portion following the bottom of the concave portion is formed thicker than an upper portion of the convex portion. Sheet. 4. The image receiving sheet according to claim 3, wherein the bottom of the concave portion and the reinforcing portion following the concave portion form a concave curved surface. 5. The image receiving sheet according to claim 1, wherein the reinforcing portion is a portion in which at least an upper end of the ridge is formed thicker than an upper portion of the ridge below the ridge. 6. The image receiving sheet according to claim 1, wherein said reinforcing portion is formed continuously in a longitudinal direction of said ridge portion. 7. The image receiving sheet according to claim 1, wherein said reinforcing portion is formed intermittently in a longitudinal direction of said ridge portion. 8. The image receiving sheet according to claim 1, wherein the reinforcing portion is a rising portion formed from at least the bottom of the concave portion and formed between the convex portions adjacent to each other across the concave portion. 9. The image receiving sheet according to claim 8, wherein an upper end of the rising portion is located at the same height as an upper end of the ridge. 10. The image receiving sheet according to claim 8, wherein an upper end of said rising portion is lower than an upper end of said ridge. 11. A concave curved surface is formed between a bottom portion of the concave portion and a lower portion of the ridge portion following the concave portion.
0. The image receiving sheet according to 0. 12. The image receiving sheet according to claim 8, wherein a bottom portion of the concave portion and a lower portion of the rising portion following the concave portion form a concave curved surface. 13. The material according to claim 1, wherein the material forming at least the concave portion and the convex portion reinforced by the reinforcing portion is a thermoplastic resin and / or a curable resin cured by a predetermined process. The image receiving sheet according to any one of the above. 14. The image receiving sheet according to claim 1, wherein at least the material forming the concave portion and the convex portion reinforced by the reinforcing portion is a biodegradable resin. 15. The image receiving sheet according to claim 1, wherein a layer made of a material forming the concave portions and the convex portions is formed on a sheet base material layer. 16. The image receiving sheet according to claim 1, wherein at least a part of a peripheral portion of the sheet surface including the uneven surface is a margin portion not having the concave portion and the convex portion. 17. The image receiving apparatus according to claim 16, wherein said margin portion is provided in an area where said separating device operates when the separating sheet is separated and fed by a separating device for separating and feeding the image receiving sheets from the stacked image receiving sheets. Sheet.