JPH08100388A - Material for recording and recycling of material for recording holding image - Google Patents

Abstract

PURPOSE: To obtain a material for recording excellent in copied or recorded image- forming properties without causing wrinkles or jamming even in reutilization after peeling the image and in recycling. CONSTITUTION: This material for recording has <=1.8% elongation in the cross direction (elongation in dipping in water) when dipped in water at 20 deg.C for 1min and 5-9 rank of sizing degree for penwriting after treatment with a wetting agent in the material for recording made of paper consisting essentially of cellulosic fibers. This material for recording is obtained by applying >=0.3%, preferably 0.5-1% water resisting agent comprising a resin such as a polyamide epichlorohydrin or glyoxal or melamine formalin, >=2%, preferably 2-5% water-soluble polymer such as PVA, starch, polyacrylamide or carboxymethyl cellulose (CMC) and >=0.3%, preferably 0.5-1.2% sizing agent having -0.6 to +0.9 contact angle when a liquid having 40mN/m surface tension is dropped onto a dried film prepared by drying the sizing agent to the paper consisting essentially of the cellulosic fibers and forming a structure for protecting binding parts among the cellulosic fibers An image removal promoting liquid is applied to an image formed of a hot-melt or heat softening ink to heat bond and/or pressure bond the image to an image peeling member. Thereby, the image is peeled and the material is recycled so as to enable the reutilization.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording material, particularly an image recording material, which is composed of a paper containing cellulose fibers as a main component and which is suitable for forming a copy or a recording image with a heat-melting or heat-softening ink. A recording material suitable for repeating reproduction and image formation in which the image is peeled and removed from the formed recording material, and the recording material is reused for image formation, and an image formed recording material. Regarding how to play. It also relates to paper having excellent dimensional stability.

[0002]

2. Description of the Related Art With the recent increase in speed of copying machines and printers, there has been a demand for copying / recording paper which is free from wrinkles and jams due to humidity and heat. Also, recent O
With the shift to A, printer paper and copy paper have been used in large quantities, which has caused a problem of deteriorating the global environment due to deforestation. Conventionally, in order to solve the problem of the deterioration of the global environment, a method has been generally used in which the ink or the like on a recording sheet that has been used once is removed, and then crushed, re-extracted, and recycled into a so-called waste paper. However, recently, there has been proposed a paper or recycling method in which an image such as a character on a paper once used is removed by a process of cleaning and can be reused for copying or printing. For example, as such a paper, as described in Japanese Patent Laid-Open No. 4-67043, the surface of a sheet-shaped recording material, particularly one surface, is subjected to a release treatment, and the release-treated surface is used. A recording material is marked to distinguish it from plain paper. However, such a copying paper is a special paper whose surface is subjected to a release treatment, and is not a general copying paper or printing paper which is used in large quantities at present, and thus has a difficulty in being applied. Therefore, it is difficult to copy by mixing with a general copying paper. Further, from the viewpoint of resource reuse, double-sided copying, that is, double-sided copying of one copy sheet is important, and it is considered that it will become the mainstream in the future. Under such circumstances, it is difficult to use recycled paper coated with a release agent on one side. JP-A-1-101576
In the method of reproducing a recording material described in Japanese Patent Application Laid-Open No. 1-101577, the recording material on which an image is formed is immersed in an organic solvent that dissolves the image forming toner resin on the recording material, and ultrasonically treated. By doing so, the image is removed from the recording material on which the image is formed. However, these methods have problems such as pollution, ignitability and toxicity due to the use of an organic solvent, and have problems in general use in offices and homes.

On the other hand, in JP-A-1-297294, a recording material made of plastic, metal, paper having poor liquid permeability, ceramics or the like is used, and the recording material is formed on the recording material. A cleaning method is described in which an image is heated through a heat-meltable peeling body to peel off the image from the recording material, but special paper (erasable paper) with a release treatment on the surface must be used. Must
At present, there is a problem that it cannot be applied to general copying paper, printing paper, etc. which are used in large quantities. further,
Recently, a method of reproducing a recording material is proposed, in which a liquid, which is an image removal accelerating liquid containing water, is applied to a recording material on which an image is formed, and then the image is fused to a peeling member to peel and remove the image from the recording material. Has been done. This method is an effective method for reproducing the recording material because it peels the image very reliably, but since the liquid containing wettable water is applied to the paper quality of the recording material, the recording material on which the image is formed is formed. Since the recording material gets wet, in the case of a recording material composed of a paper mainly composed of cellulosic fibers such as copy paper which is usually used, the recording material reproducing device has a vertical direction (machine direction). However, there are problems such as wrinkles occurring when the image is passed in the direction, and wrinkles occurring when re-copying by a copying machine or the like using a recording material from which an image has been peeled and reproduced.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to prevent wrinkles and jams due to humidity or heat in a copying machine or the like in a recording material composed of paper containing cellulose fibers as a main component. Providing a recording material, especially after applying water or an aqueous solution (image removal accelerating liquid) containing a surfactant, a water-soluble polymer, etc. to the recording material holding an image,
By heat-bonding and / or pressure-bonding the image peeling member to the image on the recording material, the image is separated from the recording material to reproduce the recording material, and the reproduced recording material is used to form an image. It is an object of the present invention to provide a recording material that solves the above problems and a method of reproducing the recording material on which an image is formed.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a recording material composed of paper containing cellulose fibers as a main component.
The recording material is characterized in that the elongation (immersion elongation) in the lateral grain direction when immersed in water at 20 ° C. for 1.8 minutes is 1.8% or less. According to the present invention, it is possible to prevent the occurrence of wrinkles and jams due to humidity and heat in a copying machine or the like, and in particular, to provide a recording material on which an image is formed with a liquid that is an image removal promoting liquid containing water. After that, the image is fused to a peeling member, and the image is peeled and removed from the recording material to reproduce the recording material. When the recording material is passed through the recording material reproducing device in the longitudinal direction (machine direction). It is possible to prevent the occurrence of wrinkles and the occurrence of wrinkles when re-copying by a copying machine or the like using the recording material from which the image has been peeled and reproduced.

The inventors of the present invention have found that wrinkles (longitudinal through wrinkles) are generated when a recording material on which an image is formed is reproduced, and wrinkles (recopy wrinkles) are generated when re-copying with a copying machine or the like. When the material is moistened with water or an aqueous solution (image removal accelerating liquid) containing a surfactant, a water-soluble polymer, etc., the cellulose fiber, which is the main component of the paper, swells, the interfiber bond is weakened, and the paper structure loosens. It was found that it is necessary to form a protective structure against water at the bonding point between the fibers in order to elucidate what is caused by this and suppress it. Then, this protective structure is formed by hardening the binding points with a water-proofing agent, wrapping (wrapping) the binding points with a water-soluble polymer, and subjecting the paper surface to strong sizing for 1 minute of the recording material. 20 ° C
The present invention has been found to prevent the generation of vertical through wrinkles and re-copy wrinkles by setting the elongation in the lateral grain direction (immersion elongation) when soaked in water to 1.8% or less. . A protective structure between fibers is formed by the above and, and the water immersion elongation is 1.8%.
In order to be below, it is preferable to use 0.4% or more of a water-proofing agent, 3% or more of a water-soluble polymer, or 0.4% or more of a sizing agent, based on the pulp used for the recording material. Water resistance agent 0.6% to 1.2%, water-soluble polymer 3% to 6
% Or sizing agent 0.6-1.6% is preferably used. In addition, a recording material composed of a paper containing cellulose fibers as a main component is added with a water-proofing agent of 0.3% or more and a water-soluble polymer 2
% Or 0.3% or more of the sizing agent is preferable, and particularly 0.5 to 1% of water resistant agent, 2 to 2 of water-soluble polymer.
It is preferable to contain 5% or a sizing agent of 0.5 to 1.2%. The sizing agent is water or an aqueous solution containing a surfactant, a water-soluble polymer, etc. (image removal accelerating liquid).
It is effective in suppressing the penetration of water, and the pen writing size after treatment with a wetting agent (pen writing size of paper dried at 110 ° C dryer after immersing the paper in a wetting liquid containing a surfactant for 5 seconds).
By setting the rank to 5 or higher, preferably ranks 5 to 9, it is possible to better prevent the generation of vertical through wrinkles and re-copy wrinkles, and it is also possible to write on the regenerated recording material with a water-based pen, and bleeding such as stamp marks. Is more preferable because it can be prevented.

The formation of the protective structure on the recording material of the present invention is possible only with the water-proofing agent, but it is necessary to add a large amount, and if a large amount is added, peeling of the image from the recording material is not possible. It becomes sufficient, and the paper-like property as copy paper is also impaired. In addition, when only water-soluble polymer is used, the effect on paper strength (stiffness) is great and the occurrence of re-copy wrinkles is prevented, but wrinkles are generated when passing through the recording material reproducing device with vertical grain. On the other hand, although it can withstand the repetition of the regeneration process once or twice, if it is more than that, it is insufficient to prevent the generation of wrinkles. In the recording material of the present invention, it is desirable that the image can be easily peeled from the recording material, that it has paper-like properties, and that no jam occurs in a copying machine. ,
In order to better prevent the occurrence of re-copy wrinkles, it is preferable to have the following characteristics. That is, (1) 20 for 1 minute
The ratio of the wet tensile strength to the pre-wet tensile strength in the grain direction when immersed in water at ℃ is 0.15 or more, particularly 0.15.
-0.4, (2) Wetting liquid permeation rate (Bristow method permeation rate of wetting liquid containing surfactant into paper) is 12 to 60 ml / m ^{2 at} 0.4 seconds, (3) Size after treatment with wetting agent The degree (size degree of paper dried in a drier containing a surfactant for 5 seconds and then dried in a 110 ° C dryer) is 0.
It is preferably 3 s or more, particularly 0.3 s to 3 s. If the ratio of the wet tensile strength to the pre-wet tensile strength in the longitudinal direction is less than 0.15, longitudinal thread through wrinkles are likely to occur, and if it is greater than 0.4, the releasability of the image from the recording material deteriorates, and the paper Likeness is also impaired. If the wetting liquid permeation rate is less than 12 ml / m ^2, the releasability of the image from the recording material is poor, and if it is greater than 60 ml / m ² , vertical perforation wrinkles are likely to occur. If the sizing degree after treatment with a wetting agent is less than 0.3 s, vertical threading is likely to occur.
If it is longer than 3 s, the releasability of the image from the recording material deteriorates. Furthermore, in order to better prevent the formation of vertical through wrinkles and re-copy wrinkles, (4) wet stiffness (stiffness measured by the Gurley method in the longitudinal direction when immersed in water at 20 ° C for 1 minute)
Is 0.3 mN or more, (5) Wet elongation for a short time (when the recording material is brought into contact with a wetting liquid containing a surfactant, 3
It is preferable to have a characteristic that the elongation of the paper in the lateral grain direction after a second) is 1.0% or less.

In the present invention, it is more effective to use a water resistant agent, a water-soluble polymer and a sizing agent in combination, and a water resistant agent of 0.4 is applied to the pulp used as the recording material.
% Or more, a water-soluble polymer of 3% or more and a sizing agent of 0.4% or more, particularly a water-proofing agent of 0.6 to 1.2%, a water-soluble polymer of 3 to 6% and a sizing agent of 0.6. It is preferred to use ~ 1.6%. Further, a water-soluble polymer is used as a main agent, a water-proofing agent of about 10% to 40% of the water-soluble polymer is used, and strong sizing is applied to the surface of the recording material to delay water penetration. Is particularly preferable.
The water-proofing agent, the water-soluble polymer, and the sizing agent may be internally added, but the effect is insufficient if only the internal addition is performed. The surface sizing is more preferably used, and the ratio of the surface sizing to the internal addition is preferably 1 or more. A size press is most suitable for the surface sizing device, but an on-machine gate roll coater or a bill blade coater may be used. Also, an off-machine coater can be used instead of on-machine. 0.3% or more of a water-proofing agent, 2% or more of a water-soluble polymer and a sizing agent on a recording material composed of a paper mainly composed of cellulose fiber.
It is preferable to contain 3% or more.
5-1%, water-soluble polymer 2-5% and sizing agent 0.5-
It is preferable to contain 1.2%. The recording material having the above characteristics, which is a combination of the water-proofing agent, the water-soluble polymer, and the sizing agent, prevents the occurrence of vertical through wrinkles, re-copy wrinkles, image peelability from the recording material, and paper-like property. ,
Preventing jams from occurring in copiers, writing with a water-based pen,
It is a recording material that is excellent in preventing bleeding such as stamp marks.

The above characteristic values are values obtained by the following measuring method. Immersion elongation: After immersing the A4 sheet in water at 20 ° C. for 1 minute, the excess liquid is removed with a filter paper, and the elongation of the dimension in the cross direction is measured with a JIS class 1 metal straight scale, and the elongation rate is%. Indicated. Pen writing size after wetting agent treatment: Wet treated paper is obtained in the same manner as the size after wetting treatment, adjusted to 20 ° C. and 65% RH, and then a plotter with a pen speed of 50 cm / s (Graphtec MP4200) is used. Then, a line drawing and English letters were drawn with pilot blue ink and an ink pen of 0.5 mm in diameter, and the blurring of the lines and letters was evaluated by a 10-step blurring sample. Rank 10: Ink is cissing and lines and characters are noticeably blurred Rank 9: Characters are blurred and the line width of the characters is small Rank 8: Characters are not blurred or the line width is not reduced, Moreover, no bleeding is seen (the outline is not distorted). Rank 7: Some characters (fastened portions, bent portions, etc.) have portions that appear dark such as bleeding or thick line width. Rank 6 : State of characters of rank 7 (thickness / thickness)
And, the characters are bleeding. Rank 5: The color of the character becomes thicker overall while leaving a part of the color of the character darker, and the character appears to be thicker Rank 4: The state of the character of rank 5 (thickness / darkness That)
And, a clear blur is seen in the character Rank 3: The color of the character becomes dark as a whole, and the character looks thick. Rank 2: The condition of the character of rank 3 (thickness / darkness)
And, there is clear blurring in the letters. Rank 1: The letters are thick and the letters are blurred.

Ratio between wet tensile strength and tensile strength before wetting: Wet tensile strength / tensile strength before wetting Tensile strength before wetting: Measured according to JIS P8113. Wet tensile strength: After immersing in water at 20 ° C. for 1 minute, excess liquid was removed with a filter paper, and the tensile strength was measured by JISP8135. Wetting liquid penetration rate: Bristow method (JAPAN TAPP
I. Paper pulp test method No. 51) Anionic surfactant dihexyl sulfosuccinate nato
Rium (MA-8 manufactured by Mitsui Cyanamid Co., Ltd.
The permeation amount (ml / m ² ) of 0.8% aqueous solution of 0) in 0.4 seconds was determined. Size after wetting: 0.8% of MA-80 surfactant
After immersing the paper in the aqueous solution for 5 minutes, the excess liquid was immediately wiped off with a filter paper and dried with a 110 ° C. drum dryer for 2 minutes to obtain a wet treated paper. When this paper was conditioned at 20 ° C. and 65% RH and floated on a 2% Rodan's Ammon solution, the time until almost the entire surface became transparent due to liquid penetration was measured. Wet Stiffness: After dipping in water at 20 ° C. for 1 minute, excess liquid was removed with filter paper, and the grammage was measured with a Gurley stiffness tester at a basis weight of 70 to 80 g / m ² . Short-time wet elongation: A 0.8% aqueous solution of a surfactant MA-80 was applied to a paper stretched with a force of 350 mN, and the paper elongation was measured 3 seconds after the application.

Polyamide epichlorohydrin resin, glyoxal, or melamine formalin resin is most suitable as the water resistance agent, but other water resistance agents for paper such as urea formalin resin and polyethyleneimine resin are appropriately adjusted in addition amount. Can be used. As the water-soluble polymer, PVA, starch, oxidized starch, and polyacrylamide resin are most suitable because of their effect and ease of use, but various plant gums, sodium alginate, carboxymethyl cellulose, methyl cellulose, chitosan, glue, casein, polyacetic acid. Vinyl, latex and the like can also be used by appropriately adjusting the addition amount. As the sizing agent, a film obtained by drying the sizing agent has a surface tension of 40 mN / m.
The contact angle (cos θ) when the above liquid is dropped is −0.6 to
A sizing agent of 0.9 is preferable, and a sizing agent of less than -0.6 causes cissing due to aqueous writability, and a sizing agent of more than 0.9 suppresses permeation into an aqueous solution (image removal accelerating liquid) containing a surfactant. The effect is insufficient. As a sizing agent, an alkyl ketene dimer sizing agent is most effective and most suitable, but a styrene-based or olefin-based synthetic sizing agent is also effective. For example, Polymaron 36 manufactured by Arakawa Chemical Industry
0, 356, 482, 1301, etc., Sanyo Chemical Industries SA
-802, 501, 502, 708, etc., Hoshiko Kagaku Kogyo Pearl Gum CS, Coropearl M, S etc., Hamano Kogyo Hamacoat S, X etc., Harima Kasei Kogyo Hersize CP, K etc.
N etc., AK etc. made by Misawa Ceramic Chemical can be used.

Further, the present invention comprises an image removal accelerating liquid containing water on a recording material which is composed of a paper containing cellulose fibers as a main component and on which a hydrophobic image is formed by a heat melting or heat softening ink. In the method of reproducing a recording material, the image separating member is heat-bonded and / or pressure-bonded to the image of the recording material after the recording material is held, and the recording material is a wet paper. A method of reproducing a recording material, which comprises a strength enhancer. As the wet paper strength enhancer, a water resistant agent, a water resistant agent and a water-soluble polymer, or a water resistant agent and a sizing agent can be used. preferable. Furthermore,
The recording material preferably has an elongation in the lateral grain direction (immersion elongation) of 1.8% or less when immersed in water at 20 ° C. for 1 minute.

According to the present invention, a recording material on which an image is formed is moistened with an image removal promoting liquid containing water, and an image peeling member is heat-bonded and / or pressure-bonded to the image of the recording material. Only the image is removed from the recording material, and the recording material from which the image is removed is reused as it is for image copying or the like. Generally, when a recording material made of paper containing cellulose fibers as a main component is wet with water, the stiffness of the recording material becomes weak. At this time, the adhesiveness between the hydrophobic image held on the recording material and the cellulose fiber is very weak. That is, the recording material composed of paper containing cellulose fibers as a main component has innumerable irregularities on the surface due to the entanglement of the fibers, and further has innumerable minute voids inside. When a hydrophobic image is formed on the recording material in such a state, the hydrophobic image fixed by the PPC copying process or the like is larger than the unevenness or the minute voids due to the entanglement of the cellulose fibers, and therefore A large number of spaces are present at the contact area with the image. When a recording material carrying such a hydrophobic image is impregnated with an image removal accelerating liquid containing water by coating, dipping, spraying or the like, the liquid causes a hydrophobic image due to capillary action in the cellulose fiber and its voids and spaces. Permeates to the site of contact with the cellulose fiber. As a result, when the action of reducing the adhesive force between the hydrophobic image and the cellulose fiber and the absorption of the liquid by the cellulose fiber, the cellulose fiber is deformed by the so-called swelling phenomenon and the space of the contact portion with the hydrophobic image increases. However, the contact area between the cellulose fiber and the hydrophobic image is reduced, and the adhesive force is reduced, so that the adhesion between the cellulose fiber and the hydrophobic image becomes very weak.
Therefore, a suitable image peeling member is heat-bonded and / or pressure-bonded to the image of the recording material while the recording material carrying the hydrophobic image is impregnated with the image removal promoting liquid containing water. The image can be easily removed without damaging the image bearing surface of the recording material.

According to the present invention, in the above-mentioned method for reproducing a recording material, the recording material contains a wet paper strength enhancer, and particularly when the recording material is immersed in water at 20 ° C. for 1 minute, the elongation in the transverse direction (immersion elongation) It has been found that wrinkles can be prevented by using a recording material having a) of 1.8% or less. According to the present invention, it is possible to prevent the generation of wrinkles when reproducing a recording material and the generation of wrinkles when the reproduced recording material is re-copied by a copying machine or the like.

Further, the image can be easily peeled from the recording material, has a paper-like property, does not cause a jam in a copying machine, etc., writes on the reproduced recording material with an aqueous pen, stamps, etc. No bleeding is preferably generated, and it is particularly preferable to use a recording material having at least one of the following characteristics in order to further prevent vertical creases and re-copy wrinkles. That is, (1) Pen writing sizing after treatment with a wetting agent (pen writing sizing of recording material dried by 110 ° C. dryer after immersing recording material in wetting liquid containing surfactant for 5 seconds) is rank 5 9), (2) the ratio of the wet tensile strength and the pre-wet tensile strength in the grain direction when immersed in water at 20 ° C. for 1 minute is 0.15 or more, particularly 0.15 to 0.4, (3)
Wetting liquid permeation speed (Bristow method permeation speed of a wetting liquid containing a surfactant into paper) is 12 to 60 m in 0.4 seconds.
l / m ² , (4) sizing degree after treatment with a wetting agent (the sizing degree of paper dried by a 110 ° C. dryer after immersing the recording material in a wetting liquid containing a surfactant for 5 seconds) is 0.3 s or more, particularly Is 0.
3s to 3s, (5) wet stiffness (stiffness measured by Gurley method in the longitudinal direction when immersed in water at 20 ° C for 1 minute) is 0.3
mN or more, and (6) short-time wet elongation (when the recording material is brought into contact with a wetting liquid containing a surfactant, the elongation of the paper in the lateral grain direction 3 seconds after landing) is 1.0% or less. It is preferable to use a recording material having at least one characteristic.

The water resistant agent, the water-soluble polymer, or the sizing agent and the amount thereof used are preferably those described above.
Examples of the method for forming an image with the heat-meltable or heat-softenable ink in the present invention include electrophotographic method, thermal transfer method, ink jet method and the like. As the image removal promoting liquid used in the present invention, it is preferable to use water, an aqueous solution containing a surfactant, an aqueous solution containing a water-soluble polymer, or an aqueous solution containing a surfactant and a water-soluble polymer. The use of a surfactant allows the image removal promoting liquid containing water to permeate the contact area between the hydrophobic image on the recording material and the cellulose fiber sufficiently and quickly, and the hydrophobic image can be peeled off in a short time. It can be assured. Examples of the surfactant include anionic (carboxylic acid salt, sulfonic acid salt, sulfuric acid ester salt, phosphoric acid ester salt, phosphonic acid salt, etc.), cationic (amine salt, quaternary ammonium salt, benzalco salt). Aluminum salts, benzethonium chloride salts, pyridinium salts, imidazolinium salts, sulfonium salts,
Polyethylene polyamine, etc., Amphoteric system (amino acid, carboxybetaine, sulfobetaine, aminosulfate, aminocarboxylic acid salt, imidazoline derivative, etc.), nonionic system (ether type, ether ester type, ester type, nitrogen-containing type, polyvalent) Ordinary surfactants such as alcohol, amino alcohol, polyethylene glycol, etc., fluorine-based surfactants and the like can be mentioned. The content in the aqueous solution is
It is preferably 0.01% to 20%, particularly preferably 0.01% to 5%.

Further, as the water-soluble polymer, for example,
Starch quality (kansho starch, potato starch,
Tapioca starch, wheat starch, corn starch, etc.), mannan (konjac, etc.), seaweed (funnel, agar, sodium alginate, etc.), plant mucilage (trolooi, tragacanth, acacia, etc.), microbial mucilage (dextran, levan, etc.) ), Proteins (such as glue, gelatin, casein, collagen), natural polymers and cellulosics (viscose, methylcellulose, ethylcellulose, hydroxyethylcellulose,
(Carboxymethyl cellulose, etc.), starch-based (soluble starch, carboxymethyl starch, dialdehyde starch) semi-synthetic polymers, synthetic polymers and the like. As the image peeling member used in the present invention, various polymers, rubber or metals such as aluminum and nickel may be directly formed into a sheet shape, a belt shape or a roller shape, and may be used on the surface of another support. It may be supported.

It should be noted that the paper containing cellulose fibers as the main component in the present invention, especially the elongation in the crosswise direction (immersion elongation) when immersed in water at 20 ° C. for at least 1 minute is 1.8.
% Or less, the wetting liquid permeation rate (the permeation rate of the wetting liquid containing the surfactant into the paper by the Bristow method) is 0.4 to 12 at 12 seconds.
60 ml / m ² , and pen writing size after treatment with a wetting agent (pen writing size of paper dried by 110 ° C. dryer after immersing paper in wetting liquid containing surfactant for 5 seconds) is rank 5-9
Paper having the characteristics of (1) is also useful in the fields of map paper, measurement recording paper, etc., which are required to have dimensional stability without wetting, paper elongation and moisture absorption wrinkles. Furthermore, this paper
The ratio of the wet tensile strength and the pre-wet tensile strength in the grain direction when immersed in water at 20 ° C. for 1 minute is 0.15 or more, and the sizing degree after the wetting agent treatment (recording material in a wetting liquid containing a surfactant is used. Was dipped for 5 seconds and then dried in a 110 ° C dryer to have a sizing degree of 0.3 s or more, and wet stiffness (measured by the vertical Gurley method of the recording material when immersed in water at 20 ° C for 1 minute) Stiffness) is 0.3 mN or more, or a short time wet elongation (when the recording material is contacted with a wetting liquid containing a surfactant, elongation of the recording material in the lateral grain direction 3 seconds after landing) is 1 It is preferable to have at least one characteristic of not more than 0.0%.

Specific embodiments of the method for reproducing the image-bearing recording material of the present invention will be described below. 1. After being made to consist of paper having cellulose fiber as a main component, the recording material on which the image is formed by the heat-melting or heat-softening ink, after holding the image removal promoting liquid containing water,
In an image holding recording material reproducing method of peeling an image from a recording material by heat-bonding and / or pressure-bonding the image of the recording material to an image peeling member, the recording material is made water resistant and water resistant A method for reproducing an image-bearing recording material, which comprises an agent and a water-soluble polymer, a water-proofing agent and a sizing agent, or a water-proofing agent, a water-soluble polymer and a sizing agent. 2. 2. The image-bearing recording material according to the item 1, wherein the recording material has a lateral elongation (immersion elongation) of 1.8% or less when immersed in water at 20 ° C. for 1 minute. How to play. 3. A recording material having a pen writing size of 5 to 9 after the treatment with a wetting agent (the pen writing sizing of the recording material dried by a 110 ° C. drier after immersing the recording material in a wetting liquid containing a surfactant for 5 seconds) 3. The method for reproducing an image-holding recording material according to the item 2, wherein 4. The ratio of the wet tensile strength to the pre-wet tensile strength in the grain direction when immersed in water at 20 ° C. for 1 minute is 0.15 or more,
Wetting liquid permeation rate (Bristow method permeation rate of a wetting liquid containing a surfactant into a recording material) is 12 to 6 at 0.4 seconds.
0 ml / m ² , sizing degree after treatment with a wetting agent (sizing degree of recording material dried at 110 ° C. dryer after immersing recording material in wetting liquid containing surfactant for 5 seconds) is 0.3 s or more, wet stiffness (Stiffness measured by Gurley method of grain length of recording material when immersed in water at 20 ° C. for 1 minute) is 0.3 mN or more, or short time wet elongation (recording material in a wetting liquid containing a surfactant). 2. The recording material having at least one characteristic that the elongation of the recording material in the lateral grain direction 3 seconds after landing when contacted is 1.0% or less. Method for reproducing image-bearing recording material of. The ratio of the wet tensile strength to the pre-wet tensile strength in the grain direction when immersed in water at 20 ° C. for 5.1 minutes is 0.15 to 0.
4 or the sizing degree after treatment with a wetting agent is 0.3 s to 3 s, wherein the image-holding recording material is regenerated. 6. The ratio of the wet tensile strength and the pre-wet tensile strength in the grain direction when immersed in water at 20 ° C. for 1 minute is 0.15 or more,
Wetting liquid permeation rate of 12 to 60 ml / m in 0.4 seconds
² , sizing degree after wetting agent treatment is 0.3s or more, wetting rigidity is 0.
4. The method for reproducing an image-bearing recording material according to 2 or 3 above, which is a recording material having all the characteristics of 3 mN or more and a short-time wet elongation of 1.0% or less. The ratio between the wet tensile strength and the pre-wet tensile strength in the grain direction when immersed in water at 20 ° C for 7.1 minutes is 0.15 to 0.
4. The method for reproducing an image-bearing recording material according to the item 6, wherein the recording material has a sizing degree of 0.3 s to 3 s after treatment with a wetting agent.

8. The recording material has a protective structure between cellulose fibers formed by a waterproofing agent, a waterproofing agent and a water-soluble polymer, a waterproofing agent and a sizing agent, or a waterproofing agent, a water-soluble polymer and a sizing agent. 8. A method for reproducing an image-holding recording material according to any one of 1 to 7 above. 9. 9. The method for reproducing an image-bearing recording material according to any one of 1 to 8 above, which is a recording material containing 0.3% or more of a water-proofing agent, 2% or more of a water-soluble polymer and 0.3% or more of a sizing agent. . 10. Water resistance agent 0.5 to 1%, water-soluble polymer 2 to 5%,
9. The method for reproducing an image-bearing recording material according to any one of 1 to 8 above, which is a recording material containing 0.5 to 1.2% of a sizing agent. 11. Water resistant agent is polyamide epichlorohydrin resin,
11. A method for reproducing an image-bearing recording material according to any one of 1 to 10 above, which is a glyoxal or melamine formalin resin. 12. 11. The method for reproducing an image-bearing recording material according to 1 to 10, wherein the water-soluble polymer is PVA, starch, polyacrylamide resin or carboxymethyl cellulose. 13. The sizing agent has a contact angle (c) when a liquid having a surface tension of 40 mN / m is dropped onto a film obtained by drying the sizing agent.
11. The method for reproducing an image-holding recording material according to any one of 1 to 10 above, wherein at least a part of the sizing agent has an os θ) of −0.6 to 0.9. 14. 14. The image-holding recording material according to 1 to 13, wherein the image removal promoting liquid is an aqueous solution containing a surfactant, an aqueous solution containing a water-soluble polymer, or an aqueous solution containing a surfactant and a water-soluble polymer. How to play.

[0021]

The present invention will be described below with reference to examples. The% in the text is based on weight unless otherwise specified. Example 1 A melamine formalin resin was internally added to the pulp at 0.5% to make a copy paper. The immersion elongation of the paper when immersed in water at 20 ° C. for 1 minute was 1.5%. Using this paper, a PPC copier (Imago 3 manufactured by Ricoh Co., Ltd.
An image was formed at 20 FPI). Copy the copy paper holding the image with a nonionic surfactant polyoxyethylene alkyl ether (BT-manufactured by Nikko Chemicals Co., Ltd.).
7) was impregnated with an aqueous solution containing 0.5%. The permeation rate by the Brist method was 18 ml / m ² at 0.4 seconds.
next. When a heated rubber roller is pressure-bonded to the copy paper holding the image and the copy paper is peeled off from the rubber roller, the image formed on the paper surface is beautifully transferred from the paper surface to the rubber roller, and the copy paper after passing through the rubber roller is formed. No wrinkles were observed, and plain copy paper was obtained. When this copying paper was reused as a copying paper in a PPC copying machine, a beautiful image could be obtained. The above operation was repeated 5 times, but it was possible to obtain a copy image of the same quality as the copy paper before reproduction.

Example 2 Polyamide epichlorohydrin resin (Hercules)
Manufactured by Epinox P-1301-A) and carboxymethyl cellulose are 0.4% and 3%, respectively, with respect to the pulp.
% Internal addition was performed to make copy paper. 1 minute of paper 20
The water immersion elongation when immersed in water at ℃ was 1.7%.
Using this paper, a PPC copier (Imago manufactured by Ricoh Co., Ltd.
An image was formed at 320 FPI). Copy the copy paper holding the image with a non-ionic surfactant polyoxyethylene alkyl ether (BT manufactured by Nikko Chemicals Co., Ltd.).
-7) was impregnated in an aqueous solution containing 0.5%. The permeation rate by the Brist method was 17 ml / m ² at 0.4 seconds. Next, a heated rubber roller is pressure-bonded to the copy paper holding the image, and the copy paper is peeled off from the rubber roller. The image formed on the paper is cleanly transferred from the paper to the rubber roller, and after passing through the rubber roller. No wrinkles were found on the copy paper, and plain copy paper was obtained.
When this copying paper was reused as a copying paper in a PPC copying machine, a beautiful image could be obtained. The above operation was repeated 5 times, but it was possible to obtain a copied image of the same quality as the image holding support before reproduction.

Example 3 LBKP beaten to 400 ml of freeness was added to an alkyl ketene dimer sizing agent of pulp ratio (AS manufactured by Japan PMC Co., Ltd.).
202) 0.5%, polyamide epichlorohydrin resin (WS-570 manufactured by Japan PMC Co., Ltd.) 0.5%, polyacrylamide resin (Polystron 117 manufactured by Arakawa Chemical Industry Co., Ltd.)
1%, calcium carbonate (PCX-850 manufactured by Shiraishi Industry Co., Ltd.)
3% of each was added internally, and further oxidized starch (MS # 380 manufactured by Nippon Shokuhin Kako Co., Ltd.)
0) 1 g / m ² (pulp ratio equivalent to 1.3%), PVA (Kuraray PVA 117) 0.7 g / m ² (pulp ratio equivalent to 1%), polyamide epichlorohydrin resin (Japan PMC
WS-525) 0.4 g / m ² (pulp ratio equivalent to 0.5%), alkyl ketene dimer sizing agent (AS202 manufactured by Japan PMC Co.) 0.9 g / m ² (pulp ratio equivalent to 1.1%).
Was subjected to surface sizing to produce a copy paper having a basis weight of 74 g / m ² . The water immersion elongation of the paper when immersed in water at 20 ° C. for 1 minute was 1.1% in the horizontal direction, and the pen writing size degree after the treatment with the wetting agent was rank 7. Further, the ratio of the wet tensile strength and the pre-wet tensile strength when the paper is immersed in water at 20 ° C. for 1 minute is 0.2.
4. The wetting liquid permeation rate was 14 ml / m ² , the sizing degree was 1.8 s after the wetting treatment, the wetting rigidity was 0.38 mN in the longitudinal direction, and the short-time wet elongation was 0.12% in the transverse direction. An image was formed on this paper by a PPC copying machine (IMAGIO320FPI manufactured by Ricoh Co., Ltd.). Anionic surfactant Sodium dihexyl sulfosuccinate on paper (MA-Mitsui Cyanamid Co., Ltd.
80%) was impregnated with an aqueous solution (image removal accelerating liquid) containing 0.8%, and the image was transferred to the peeling member by pressing a heated rubber roller (peeling member) onto the image to reproduce the regenerated paper. An image was formed on the PPC copying machine.
When this image formation and reproduction were carried out for 5 cycles, vertical wrinkles, re-copy wrinkles in the copying machine, and jamming were not observed. Further, in the reproduction processing, the image was sufficiently peeled off, and generation of bleeding was not observed when writing on the reproduced paper with an aqueous pen.

Example 4 The amount of the water-proofing agent, the water-soluble polymer and the sizing agent used in Example 1 was reduced, and the polyamide ratio of pulp epichlorohydrin resin (WS-570 manufactured by Japan PMC Co., Ltd.) was 0.1% and carbonic acid. 3% of calcium (PCX-850 manufactured by Shiraishi Industry Co., Ltd.) was added internally, and further, oxidized starch (MS # 3800 manufactured by Nippon Shokubai Kako Co., Ltd.) 1.1 g / m ² by a size press of a Fourdrinier paper machine.
(Equivalent to 1.5% pulp ratio), PVA (PVA manufactured by Kuraray Co., Ltd.)
117) 1.1 g / m ² (equivalent to a pulp ratio of 1.5%), polyamide epichlorohydrin resin (WS-made by Japan PMC)
525) 0.2 g / m ² (equivalent to a pulp ratio of 0.3%), alkyl ketene dimer sizing agent (AS20 manufactured by Japan PMC Co., Ltd.
2) Surface sizing of 0.3 g / m ² (equivalent to a pulp ratio of 0.4%) was performed to make paper having a basis weight of 74 g / m ² . When the paper is soaked in water at 20 ℃ for 1 minute, the water expansion is 1.7
%, The pen writing size degree after the treatment with the wetting agent was rank 5. Further, the ratio of the wet tensile strength before dipping the paper in water at 20 ° C. for 1 minute and the tensile strength before wetting is 0.16, the wetting liquid permeation rate is 50 ml / m ² , and the size degree after wetting treatment is 0.5 s.
Wet stiffness is 0.33 mN in length, short time wet elongation is 0.75 in width.
%Met. Using this paper, image formation and reproduction were carried out for 5 cycles in the same manner as in Example 1. No longitudinal wrinkles, no re-copy wrinkles in the copying machine, and no occurrence of jams were observed.
Further, in the reproduction processing, the image was sufficiently peeled off, and generation of bleeding was not observed when writing on the reproduced paper with an aqueous pen.

Example 5 The water resistant agent used in the size press in Example 1 was changed to glyoxal, and the internal additive was changed to acidic paper type. That is, 1.8% of a sizing agent (Size Pine E manufactured by Arakawa Chemical Industry Co., Ltd.) and 2.5% of a sulfuric acid band were added to the beaten paper material of Example 1.
%, 3% Talc (Talc SF manufactured by Asada Flour Mills), polyacrylamide resin (Polystron 11 manufactured by Arakawa Chemical Industry Co., Ltd.)
7) Add 1% each internally, and further use a size press of a Fourdrinier paper machine to make oxidized starch (MS # 3 manufactured by Nippon Shokuhin Kako Co., Ltd.).
800) 1.0 g / m ² (equivalent to 1.3% pulp ratio), PV
A (PVA 117 manufactured by Kuraray Co., Ltd.) 0.7 g / m ² (equivalent to a pulp ratio of 1.0%), glyoxal (manufactured by Nippon Synthetic Chemical Co., Ltd.)
0.4 g / m ² (equivalent to a pulp ratio of 0.5%), styrene synthetic sizing agent (Polymaron 360 manufactured by Arakawa Chemical Industry Co., Ltd.)
9 g / m ² (corresponding to a pulp ratio of 1.1%) was surface-sized to make a paper having a basis weight of 74 g / m ² . 1 minute of paper 2
The water immersion elongation when immersed in water at 0 ° C. was 1.3%, and the pen writing size degree after treatment with the wetting agent was rank 5. Also,
The ratio of the wet tensile strength and the pre-wet tensile strength when the paper is immersed in 20 ° C. water for 1 minute is 0.18, and the wetting liquid penetration rate is 4
5 ml / m ² , sizing degree after wetting treatment of 0.3 s, wetting rigidity was 0.41 mN in length, and short-time wet elongation was 0.44% in width. Using this paper, image formation and reproduction were carried out for 5 cycles in the same manner as in Example 1. No longitudinal wrinkles, no re-copy wrinkles in the copying machine, and no occurrence of jams were observed. Further, in the reproduction processing, the image was sufficiently peeled off, and generation of bleeding was not observed when writing on the reproduced paper with an aqueous pen.

Example 6 The water resistant agent used in the size press in Example 1 was changed to melamine formalin resin, and the internal additive was changed to acidic paper type. That is, 1.8% of a sizing agent (Size Pine E manufactured by Arakawa Chemical Industry Co., Ltd.), 2.5% of a sulfuric acid band, and 3% of talc (Talc SF manufactured by Asada Flour Milling Co., Ltd.) were added to the beaten paper material of Example 1.
%, Polyacrylamide resin (Polystron 117 manufactured by Arakawa Chemical Industry Co., Ltd.) 1%, and melamine formalin resin (Sumirase Resin AC manufactured by Sumitomo Chemical Co., Ltd.) 0.5% were added internally, respectively, and the size of Fourdrinier paper machine 1.0 g / of oxidized starch (MS # 3800 manufactured by Nippon Shokuhin Kako Co., Ltd.) in a press
m ² (equivalent to 1.3% pulp ratio), PVA (Kuraray PV
A117) 0.7 g / m ² (equivalent to a pulp ratio of 1.0%), melamine formalin resin (Sumitomo Chemical Co., Ltd. Sumirez resin 613) 0.2 g / m ² (equivalent to a pulp ratio of 0.3%),
A styrene-based synthetic sizing agent (Polymaron 360 manufactured by Arakawa Chemical Industry Co., Ltd.) of 0.9 g / m ² (equivalent to a pulp ratio of 1.1%) was surface-sized to produce a paper having a basis weight of 74 g / m ² . The water immersion elongation of the paper when immersed in water at 20 ° C. for 1 minute was 1.1% in the horizontal direction, and the pen writing size degree was rank 5 after the treatment with the wetting agent. Further, the ratio of the wet tensile strength and the pre-wet tensile strength when the paper is immersed in water at 20 ° C. for 1 minute is 0.20, the wetting liquid permeation rate is 46 ml / m ² , and the size degree after the wet treatment is 0.3.
s, wet stiffness 0.44 mN in the vertical direction, short-time wet elongation 0.4 in the horizontal direction.
It was 14%. Using this paper, image formation and reproduction were carried out for 5 cycles in the same manner as in Example 1. No longitudinal wrinkles, no re-copy wrinkles in the copying machine, and no occurrence of jams were observed. Further, in the reproduction processing, the image was sufficiently peeled off, and generation of bleeding was not observed when writing on the reproduced paper with an aqueous pen.

Comparative Example 1 Ricoh PPC paper "RICOPY PPC paper TYP"
E6200 ”(T6200 paper) was immersed in water at 20 ° C. for 1 minute, the water immersion elongation was 3.3%, and the pen-writing size was 3 after the wetting agent treatment. Also, the paper was kept at 20 ° C. for 1 minute. Of wet tensile strength before wetting in water of 0.09, the wet liquid penetration rate is 82 ml / m
² 、 Size after wet treatment 0s, wet stiffness 0.28m in length
N, short-time wet elongation was 3.61% in width. Image formation and reproduction were carried out for 5 cycles using this paper in the same manner as in Example 1. When this paper was subjected to reproduction processing through vertical stitches, a large number of wrinkles were generated in the vertical direction and it could not be reused. . Further, if the reproduction process is performed through the horizontal stitches, no wrinkles are generated, but if re-copied by a copying machine, wrinkles are generated and the product cannot be reused. In addition, it was confirmed that 1% of jam occurred in the copying machine jam.

Comparative Example 2 The amount of the water-proofing agent, the water-soluble polymer and the sizing agent in Example 4 was reduced by 1 point, and the polyamide ratio of the pulp epichlorohydrin resin (WS-570 manufactured by Japan PMC Co., Ltd.) was 0.1%.
3% of calcium carbonate (PCX-850 manufactured by Shiraishi Kogyo Co., Ltd.) was added internally, and further, oxidized starch (MS # 3800 manufactured by Nippon Shokuhin Kako Co., Ltd.) was applied with a size press of a Fourdrinier paper machine.
0.7 g / m ² (equivalent to a pulp ratio of 1%), PVA (Kuraray PVA 117) 0.7 g / m ² (equivalent to a pulp ratio of 1%),
Polyamide epichlorohydrin resin (W from PMC Japan
S-525) 0.15 g / m ² (pulp ratio equivalent to 0.2%), alkylketene dimer sizing agent (AS202 manufactured by Japan PMC Co.) 0.2 g / m ² (pulp ratio equivalent to 0.3%)
Was subjected to surface sizing to produce a paper having a basis weight of 74 g / m ² . The water immersion elongation of the paper when immersed in water at 20 ° C. for 1 minute was 2.1% in the horizontal direction, and the pen writing size degree was rank 5 after the treatment with the wetting agent. In addition, the ratio of the wet tensile strength and the pre-wet tensile strength when the paper is immersed in water at 20 ° C. for 1 minute is 0.13,
The wetting liquid permeation rate was 68 ml / m ² , the sizing degree after wetting treatment was 0.1 s, the wetting rigidity was 0.32 mN in the longitudinal direction, and the short-time wet elongation was 1.23% in the lateral direction. When this paper was used to perform image formation and reproduction for 5 cycles in the same manner as in Example 1, when the reproduction processing was performed through the vertical stitches, wrinkles occurred from the 3rd cycle and the paper could not be reused. In addition, wrinkles often occurred when re-copying with a copying machine even if there were no wrinkles in the reproduction process. No jam was found.

Comparative Example 3 A waterproofing agent, a water-soluble polymer and a sizing agent were used only by internal addition. That is, pulp ratio alkyl ketene dimer sizing agent (AS202 manufactured by Japan PMC) 0.35%, polyamide epichlorohydrin resin (WS-57 manufactured by Japan PMC).
0) 0.35%, calcium carbonate (PCX manufactured by Shiraishi Industry Co., Ltd.
−850) 3%, polyacrylamide resin (Polystron 117 manufactured by Arakawa Chemical Industry Co., Ltd.) 1%, and cationic starch (Himax NC10 manufactured by Kyoritsu Organic Industry Co., Ltd.) 1.5% were internally added to make paper. The water immersion elongation of the paper when immersed in water at 20 ° C. for 1 minute was 2.3% in the lateral direction, and the pen writing size degree after the treatment with the wetting agent was rank 5. The ratio of the wet tensile strength and the pre-wet tensile strength when the paper is immersed in water at 20 ° C. for 1 minute is 0.15, the wetting liquid permeation rate is 63 ml / m ² , and the size degree after the wet treatment is 0.1 s. The wet rigidity was 0.32 mN in the longitudinal direction and the short-time wet elongation was 1.28% in the lateral direction. Image formation and reproduction were carried out for 5 cycles using this paper in the same manner as in Example 1. The state of wrinkles generated when the paper was reprocessed by vertical stitching and the generation of wrinkles when re-copied by a copying machine. The condition was similar to that of Comparative Example 2 and was better than that of Comparative Example 1, but was unsatisfactory for repeated reuse. No jam was found.

[0030]

According to the present invention, it is possible to prevent the occurrence of wrinkles and jams in a copying machine or the like due to humidity or heat. In particular, water, a surfactant, After applying an aqueous solution containing a water-soluble polymer (image removal accelerating liquid), heat and / or pressure bond the image to the peeling member to peel off the image from the recording material and regenerate the recording material. In this case, wrinkles are generated when the recording material is passed through the recording material reproducing device in the longitudinal direction (machine direction), and the recording material regenerated by peeling and removing the image is reproduced by a copier or the like. It is possible to prevent wrinkles and jams when copying. Furthermore, when an image is peeled off from the recording material and the recording material is reproduced, the image is easily peeled from the recording material, and the paper-like property is excellent. It is possible to prevent blurring such as writing and stamp marks.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical indication location G03G 21/00 570 (31) Priority claim number Japanese Patent Application No. 6-1883819 (32) Priority date Hei 6 (1994) August 5 (33) Priority claiming country Japan (JP) (72) Inventor Toshiyuki Kawanishi 1-3-6 Nakamagome, Ota-ku, Tokyo Rico Co. Ltd. (72) Inventor Masato Igarashi Tokyo 1-3-6 Nakamagome, Ota-ku, Tokyo Reco stock company

Claims (24)

[Claims] 1. A recording material composed of paper containing cellulose fibers as a main component has a lateral elongation (immersion elongation) of 1.8% or less when immersed in water at 20 ° C. for 1 minute. Recording material characterized by. 2. The pen writing sizing degree after treatment with a wetting agent is 5 (the pen writing sizing degree of a recording material which is obtained by immersing the recording material in a wetting liquid containing a surfactant for 5 seconds and then drying it at a 110 ° C. dryer).
The recording material according to claim 1, characterized in that 3. The ratio of wet tensile strength to pre-wet tensile strength in the grain direction when immersed in water at 20 ° C. for 1 minute is 0.1.
5 or more, the wetting liquid permeation rate (the permeation rate of the wetting liquid containing a surfactant into the recording material by the Bristow method) is 12 to 60 ml / m ^{2 at} 0.4 seconds, and the sizing degree after the treatment with the wetting agent (surfactant After immersing the recording material in the wetting liquid containing it for 5 seconds, 110 ° C
The sizing degree of the recording material dried with a dryer is 0.3 s or more, and the wet rigidity (stiffness measured by the Gurley method of the longitudinal grain of the recording material when immersed in water at 20 ° C. for 1 minute) is 0.3 mN or more. Or a short-time wet elongation (when the recording material is brought into contact with a wetting liquid containing a surfactant, the elongation of the recording material in the lateral grain direction 3 seconds after landing) is 1.0% or less. The recording material according to claim 1 or 2, which has two characteristics. 4. The ratio of the wet tensile strength to the pre-wet tensile strength in the grain direction when immersed in water at 20 ° C. for 1 minute is 0.1.
5 to 0.4, or the size degree after wetting agent treatment is 0.3s to 3
The recording material according to claim 3, wherein the recording material is s. 5. The ratio of the wet tensile strength to the pre-wet tensile strength in the grain direction when immersed in water at 20 ° C. for 1 minute is 0.1.
5 or more, 12 to 60 at a wetting liquid permeation rate of 0.4 seconds
ml / m ² , sizing degree after wetting agent treatment of 0.3 s or more, wetting rigidity of 0.3 mN or more, and short time wet elongation of 1.0% or less. The recording material according to 1 or 2. 6. The ratio of the wet tensile strength to the pre-wet tensile strength in the grain direction when immersed in water at 20 ° C. for 1 minute is 0.1.
5 to 0.4, and sizing degree after wetting agent treatment is 0.3s to 3s
The recording material according to claim 5, wherein 7. A recording material made of paper containing cellulose fibers as a main component, wherein a structure for protecting inter-cellulosic fiber joints is provided with a waterproofing agent, a waterproofing agent and a water-soluble polymer, or a waterproofing agent and a sizing agent. 7. The recording material according to claim 1, 2, 3, 4, 5 or 6, wherein the recording material is formed. 8. Water resistant agent 0.3% or more, water-soluble polymer 2%
The recording material according to claim 7, which contains at least 0.3% of the sizing agent. 9. A water resistant agent 0.5 to 1%, a water soluble polymer 2 to
The recording material according to claim 7, comprising 5% or 0.5 to 1.2% of a sizing agent. 10. The coating composition according to claim 1, wherein a structure for protecting inter-cellulosic fiber joints is formed by a water-proofing agent, a water-soluble polymer and a sizing agent. Recording material. 11. A water resistance agent of 0.3% or more, a water-soluble polymer 2
11. The recording material according to claim 10, wherein the recording material contains 0.1% or more and a sizing agent of 0.3% or more. 12. A water resistant agent 0.5 to 1%, a water-soluble polymer 2
11. The recording material according to claim 10, wherein the recording material contains 0.5% to 5% and a sizing agent of 0.5% to 1.2%. 13. The recording material according to claim 7, wherein the waterproofing agent is a polyamide epichlorohydrin resin, glyoxal or melamine formalin resin. 14. The recording material according to claim 7, wherein the water-soluble polymer is PVA, starch, polyacrylamide resin or carboxymethyl cellulose. 15. A sizing agent having a contact angle (cos θ) of −0.6 to 0.9 when a liquid having a surface tension of 40 mN / m is dropped onto a film obtained by drying the sizing agent. At least a part thereof is included.
12. The recording material according to item 12. 16. A water-proofing agent for a pulp used as a recording material composed of paper containing cellulose fibers as a main component is used as a water resistant agent.
4% or more, water-soluble polymer 3% or more, or size 0.4
% Or more is used, The manufacturing method of the recording material of Claim 7-9 or 13-15 characterized by the above-mentioned. 17. The coating composition according to claim 16, wherein a water-proofing agent of 0.6 to 1.2%, a water-soluble polymer of 3 to 6% or a sizing agent of 0.6 to 1.6% is used. Recording material manufacturing method. 18. A water-proofing agent for pulp used for a recording material composed of paper containing cellulose fibers as a main component.
4% or more, water-soluble polymer 3% or more and sizing agent 0.4%
The method for producing a recording material according to claim 10, wherein the above is used. 19. The coating according to claim 18, wherein a water-proofing agent of 0.6 to 1.2%, a water-soluble polymer of 3 to 6% and a sizing agent of 0.6 to 1.6% are used. Recording material manufacturing method. 20. The method for producing a recording material according to claim 16, wherein all or a part of the waterproofing agent, the water-soluble polymer and the sizing agent are surface-sized. 21. An image removal accelerating liquid containing water is held on a recording material, which is composed of paper containing cellulose fibers as a main component, and on which an image is formed by a heat-melting or heat-softening ink, In a method for reproducing an image-holding recording material, which peels an image from the recording material by heat-bonding and / or pressure-bonding the image of the recording material to an image peeling member,
A method for reproducing an image-bearing recording material, wherein the recording material contains a waterproofing agent, a waterproofing agent and a water-soluble polymer, or a waterproofing agent and a sizing agent. 22. An image removal promoting liquid containing water is held on a recording material, which is composed of paper containing cellulose fibers as a main component, and on which an image is formed by a heat-melting or heat-softening ink, In a method for reproducing an image-holding recording material, which peels an image from the recording material by heat-bonding and / or pressure-bonding the image of the recording material to an image peeling member,
A method for reproducing an image-bearing recording material, wherein the recording material contains a waterproofing agent, a water-soluble polymer and a sizing agent. 23. The elongation (immersion elongation) in the lateral grain direction when the recording material is immersed in water at 20 ° C. for 1 minute is 1.8%.
23. The method for reproducing an image-holding recording material according to claim 21, which is the following recording material. 24. In a paper containing cellulose fibers as a main component, when it is immersed in water at 20 ° C. for 1 minute, the elongation in the lateral grain direction (immersion elongation) is 1.8% or less, and the wetting liquid permeation rate (surfactant is used). The Bristow's method penetration rate of the containing wetting liquid into the paper is 12 to 60 ml / m ^{2 at} 0.4 seconds, and the pen writing size after wetting agent treatment (after immersing the paper in the wetting liquid containing a surfactant for 5 seconds), A paper characterized by having a pen writing size degree of a paper dried with a 110 ° C. drier (rank size 5-9).