JPH0643682A - Reproducible copying paper and its producing and reproducing method - Google Patents

Abstract

PURPOSE:To easily erase the copied pattern on a copying paper, especially a facsimile copying paper, by transferring a toner on the copying paper having a specified number of fine protrusions having specified average height and diameter, fixing the toner on the copying paper by pressing and then mechanically separating the toner from the copying paper. CONSTITUTION:Two thousand or more units of fine protrusions having 10-100mum height and 10-100mum average diameter are provided per cm<2> of a copying paper. The resolving power of picture is lowered at <2000 units. The fine protrusion is not specified, and the glass bead powder obtained by crushing glass, atomizing and heating the obtained fine powder, the protrusion obtained by electrically napping a plastic sheet, etc., are used. In the copying paper, fine toner particles are mechanically recovered from the paper by suction of a vacuum pump, attraction of a magnetic force, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reusable electronic copying paper.

[0002]

2. Description of the Related Art Although the electronic copying method is widely used,
Unnecessary copied documents are discarded because the copied character patterns cannot be erased. The discarded paper is recycled as recycled paper, but there are many problems such as the cost of collection, grading, deinking, and the like, and the quality of recycled paper is poor and the recovery rate is fundamentally low. is there.

[0003]

SUMMARY OF THE INVENTION The present invention is a copy sheet,
In particular, it is an object of the present invention to provide a copy sheet for a facsimile copy sheet, in which a copy character pattern can be erased by a simple operation. For example, if such a facsimile copying paper is used, first, the obtained information is selected for preservation and non-preservation, and the permanent preservation information is re-copied by ordinary copying and stored, and the re-copied information is also included. The sheet of non-stored information is for the purpose of erasing a copied character pattern so that the sheet can be repeatedly used, thereby saving waste of wasted paper resources.

[0004]

In the conventional electronic copying system using toner powder, the present inventor fixes fine toner particles on a copy sheet by fusing a resin having a low melting point. Since it is not possible to remove the character pattern, the fine particle powder can be used to retain a certain shape by simply compressing it. If it is held on the sheet by compressing it without fusing it, the character pattern that is simply fixed by mechanical compression can be used mechanically such as suction, vibration, magnetic force after use. The inventors have found that they can be easily removed, and have completed the present invention by utilizing this knowledge. That is, the present invention comprises the inventions of the following items.

(1) Toner is transferred by an electrophotographic photosensitive member to a copy sheet having 2000 protrusions / cm ² or more of fine protrusions having an average height of 10 to 100 μm and an average diameter of 10 to 100 μm, and pressure is applied to the copy sheet. A method for recycling a copy sheet, comprising fixing the toner on the sheet, and then detaching the toner from the copy sheet by a mechanical method. (2) The method for recycling copying paper according to claim 1, wherein the toner is a low melting point resin powder containing magnetic powder. (3) Average height 10 to 100 μm, average diameter 10 to 10
Reproducible copy paper with 2,000 micrometer protrusions of 2000 / cm ² . (4) The reproducible copy paper according to item 3, wherein the minute projections are colorless inorganic powder. (5) The reproducible copy paper according to item 3, wherein the minute protrusions are fine hairs raised from the copy paper. (6) By the silk screen printing method, the surface of the sheet is provided with the thermosetting or photocurable adhesive liquid application points of a pattern pattern of 2000 / cm ² or more regular lattice points, and then this sheet is applied. A method for producing a reproducible copy paper, which comprises sprinkling inorganic fine particles, adhering the inorganic fine particles to the points of the adhesive, and then irradiating this with light or heating or leaving it to cure the adhesive. (7) The method for producing a reproducible copy paper according to item 6, wherein the inorganic fine particles are glass beads.

As the sheet used in the paper of the present invention, plastic sheets such as natural paper sheets and synthetic paper sheets, and laminated sheets thereof can be used. The toner used for copying the paper of the present invention has an average particle diameter of 5 to 15 μm, and can be used without particular limitation as long as it is magnetic fine particles such as iron that can be imaged by magnetic force. In particular, the toner used in the conventional electronic copying method uses a resin having a low melting point, for example, polystyrene as a binder. Resin is not essential for the reproduction method of the present invention, but when using a normal copying toner, the character pattern can be fixed by simply heating the copy when it is used for permanent storage, and Since the toner fine particles obtained by crushing the resin are irregularly shaped angular fine particles, they are easily caught between the minute projections of the paper of the present invention and are desirable in that the copy image of the paper of the present invention is stable.

The minute protrusions of the copy sheet of the present invention have a height of 10 to 10.
The size is 100 μm and the average particle size is 10 to 100 μm.
The number is 2000 or more, preferably 5000 or more per cm ² . If the number is less than 2000, the resolution of the image will decrease. There are no particular restrictions on the minute protrusions,
For example, it is possible to use glass bead powder obtained by heating a fine powder made by crushing glass in a spray state, and fine protrusions obtained by electrically raising a plastic sheet. In the case of using minute glass beads, first, a thermosetting or photocurable adhesive liquid is used in place of ink on the sheet, and silk-screen printing is performed in a regularly arranged fine dot pattern. By this silk screen printing, fine adhesive spots of a dot pattern regularly arranged in a lattice shape or an equilateral triangle can be attached to the paper surface on the surface of the sheet. The diameter of the adhesive printed here is preferably about the same as the average particle size of the powder used for the minute protrusions. If this diameter is large, two or more fine particles adhere to the same point, and the regularity of the minute projections is disturbed. Further, when the viscosity of the adhesive is low, the glass bead fine particles are sprinkled in a state where the curing reaction has progressed slightly.

The original plate of the screen printing plate is made of a photocurable resin by a conventional method, and is 20 per 1 cm ² of the paper surface.
It is possible to produce an original plate having 0 to 80,000 points. When the glass bead powder is sprinkled on the dot pattern of the adhesive immediately after printing in this way, the glass bead fine particles adhere to the dots of each adhesive. Then
This paper is heated or exposed to light or left at room temperature to cure the adhesive. The adhesive hardens and tightly bonds the glass beads, is not tacky, and does not stick to the toner when it comes in contact. The use of pressure sensitive adhesives as an adhesive in the manufacture of the papers of this invention is undesirable because the toner adheres to them. The curable adhesive used in the present invention is not particularly limited, for example, urea resin, ethylene urea, melamine, an amino resin produced by the reaction of a compound having an amino group such as benzoguanamine with formalin,
Adhesives such as phenolic resins, epoxy resins, furan resins, polyisocyanate resins can be used.

In the reproducing method of the present invention, first, the image of the toner imaged by the electrophotographic photosensitive member is transferred onto the paper of the present invention by a normal optical copying system, and the image is transferred to a room temperature silicon roller, Teflon roller or the like. The toner image is fixed on the paper surface by pressing it with a roller having small surface adhesion. Even if the toner image on the paper surface fixed in this way is touched with the hand, the toner is not attached to the hand and the image is not broken. The copy of the paper of the present invention can be handled in the same manner as a conventional electronic copy paper. In the copying paper of the present invention, the toner particles can be collected from the paper surface by a mechanical method, for example, suction with a vacuum pump, suction with a magnetic force, or the like. For example, when the toner particles are sucked by these methods, it is possible to further improve the efficiency by vibrating the surface of the paper immediately before the suction or making the brush easily detach the toner particles. Also, the copying surface with toner on the paper is placed outside so that it passes over the roller with a small curvature so that it is reversed, and the vacuum pump suction port is placed in contact with the top of the roller, or a magnet that is in contact with this roller. Toner can be attracted by rotating the roller. The paper of the present invention is
By such a simple mechanical method, it can be easily regenerated and the copy paper can be repeatedly used. Further, the collected toner can be reused.

[0010]

The copying paper of the present invention can be electronically copied,
The toner is fixed so that it will not be detached even when touched by hand or in normal handling, and clear image copying can be obtained, and unnecessary copied documents have the advantage that the copied text pattern can be erased by a simple mechanical operation. , It is beneficial in terms of saving paper resources.

Claims (7)

[Claims] 1. An average height of 10 to 100 μm and an average diameter of 10
The toner is transferred by an electrophotographic photosensitive member to a copy sheet having 2,000 to 100 μm fine protrusions / cm ² or more, the toner is fixed on the copy sheet by pressurization, and then the toner is mechanically transferred to the copy sheet. A method for recycling reproducible copy paper, characterized in that it is detached from the sheet. 2. The method for recycling copying paper according to claim 1, wherein the toner is a low melting point resin powder containing magnetic powder. 3. An average height of 10 to 100 μm and an average diameter of 10
Reproducible copy paper with 2000 to 100 micrometer protrusions / cm ² . 4. The minute projections are colorless inorganic powders.
Reproducible copy paper as described. 5. The reproducible copy sheet according to claim 3, wherein the minute protrusions are fine hairs raised from the copy sheet. 6. The surface of the sheet is provided with a thermosetting or photocurable adhesive liquid application point of a pattern pattern composed of 2,000 / cm ² or more regular lattice points on the surface of the sheet by silk screen printing, and then, A method for producing a reproducible copy paper, comprising sprinkling inorganic fine particles on a sheet, adhering the inorganic fine particles to the points of the adhesive, and then curing the adhesive by irradiating it with light, heating or leaving it to stand. 7. The method for producing a reproducible copy paper according to claim 6, wherein the inorganic fine particles are spherical glassy beads.