JP2003202695A - Toner receptive continuous paper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide toner receptive continuous paper adaptive to a system for consecutively supplying paper at high speed in an electrophotographic system, providing high image quality, free from the occurrence of blister due to thermal fixing in high-speed recording, having uniform image density and glossiness and made excellent in the fix level or the cracking property of an image, and an image formed matter using the paper. <P>SOLUTION: The toner receptive continuous paper has paper base material principally composed of pulp fibers and a toner receptive layer at least on one surface of the base material, and its density is 0.85 to 1.10 g/cm<SP>3</SP>, its ply bond strength is 600 to 1,000 g.cm/in<SP>2</SP>, and its air permeability is ≤5,000 seconds. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toner-receptive continuous paper applied to an electrophotographic printer and capable of recording an image comparable to printing, and particularly to a system for continuously supplying paper at high speed. The present invention relates to a toner-receptive continuous paper having high image quality, high-speed recording and excellent running property, and an image-formed product using the same.

[0002]

2. Description of the Related Art In recent years, with the advance of IT in society, it is required to transmit and output a large amount of digital information instantaneously, and to make a part of the information variable based on a database. On the other hand, electrophotographic printers have higher image quality,
As the speed increases, various efforts are being made to address the above situation. Against this backdrop, the field of on-demand printing is being built, and electrophotographic printers, in particular, high-speed and high-quality output machines, are being marketed under the name of digital printing machines.

Conventional electrophotographic copying machines and printers are intended for offices, and use sheets that have been finished into sheets in advance. On the other hand, in order to enable high-speed printing, a method of continuously printing paper in a winding form has been developed. Such a system is one of the purposes to use the application as an alternative to traditional printing. For this reason, art paper and coated paper for printing are used in addition to high-quality paper, but it is known that blisters in the shape of blisters occur when the toner is thermally fixed, and the appearance remarkably deteriorates. . As a countermeasure, if the fixing temperature is lowered,
Insufficient melting of the toner causes problems such as insufficient gloss or insufficient fixing strength.

The cause of blister generation is thermal fixing of toner.
Since the paper is rapidly exposed to high temperature, the moisture in the paper is
It is estimated to be for. The swelled water is fine inside the paper
Diffuses in the surface or in-plane direction through various voids
But the toner receiving layer is formed on the surface.
And, the escape place of water decreases and it becomes easy to become a blister. This
As a countermeasure against the problem, it is specified in Japanese Patent Laid-Open No. 5-241366.
A paper base material with an air permeability in the range may have voids inside.
3 to 7 g / m coating layer containing a specific amount of organic pigment ^TwoRecord of
It is suggested to provide a layer with an air permeability of 4000 seconds or less.
Has been. However, the coating amount is 3 to 7 g / m^TwoThen the coat
Does not satisfy the texture of paper and does not use organic pigments in the coating layer.
In addition to the drawbacks such as static electricity being prone to occur with heavy use,
Blister is completely suppressed when the temper is less than 4000 seconds.
I can't get it. Also, JP-A-11-160906
In the official gazette, when the coated paper is pulled up after being immersed in water,
The subsequent increase in thickness is less than 30 μm and the internal bond strength is
0.27 kJ / m^TwoAbove, and the air permeability is 6000 seconds or less
It is suggested to: Focusing on cut paper
Avoids blister in medium and low speed copiers and printers
Can be used, but at higher speed, used as continuous paper such as rolls
Control, blister suppression, uniform image density and
Although it has a glossiness and glossiness,
Since internal bond strength is reduced in bending crackability,
Was difficult to satisfy.

[0005]

An object of the present invention is to solve the above-mentioned problems, and in particular, it corresponds to a system for continuously feeding paper at high speed by an electrophotographic method, and Toner receptive continuous paper (hereinafter referred to simply as "paper") that has high image quality, uniform image density and gloss without blistering due to heat fixing at high speed recording, and excellent in image fixing strength and breakage And an image formed product using the same.

[0006]

A toner-receptive continuous paper according to the present invention has a paper base material mainly composed of pulp fibers and a toner-receptive layer on at least one surface thereof. The density of paper is 0.85 to 1.10 g / cm
³ and the interlayer strength is 600 to 1000 g · cm / in
^The air permeability is ² and the air permeability is 5000 seconds or less.

The coating amount of the toner receiving layer is 5 to 20.
It is preferably g / m ² . The toner-receptive continuous paper is preferably used in a toner image forming system that forms a toner image on the toner-receptive continuous paper and then forms an image by heat fixing. Further, it is preferable that the toner receiving continuous paper is used in a toner image forming system for forming an image by a method of transferring a toner image from a heated blanket roll.

The image-formed product according to the present invention is characterized in that an image is formed by the toner image-forming system using the toner-receptive continuous paper.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION In order to solve the above problems, the present inventor diligently studied the effects of blister generation during heat fixing and physical properties of paper when recording continuous paper at high speed, particularly with high density images. went. To fix toner at high speed,
It is necessary to rapidly heat the fixing temperature to 150 to 200 ° C. to melt the toner and bring it into close contact with the paper. It is considered that when such rapid heating is performed, the water present inside the paper expands, destroying the paper layer structure and causing blisters. In particular, since the toner is formed into a film by heating in the heavy color portion where the amount of toner is large, the fine pores in which moisture diffuses are reduced, and blisters are likely to occur. Further, even if the air existing in the toner particle layer before fixing expands, fine blisters may be generated in the image portion. Therefore, if the fixing temperature is lowered in order to prevent blister, the strength of the toner-receiving layer will be insufficiently expressed, the adhesiveness to the paper will be reduced, or the image density after melting may be different depending on the type of toner. However, there is a problem such as a decrease in the uniformity of gloss and the uniformity of glossiness.

Blister does not occur if the diffusion of water vapor in the paper layer that causes blistering is easy or if the interlayer strength of the paper layer is sufficient to suppress expansion by water vapor. The interlayer strength of the paper layer depends on the bond strength between the pulp fibers constituting the paper layer, and it is necessary to improve the strength depending on the type of pulp, beating conditions, added chemicals and the like. The diffusion direction of water vapor in the paper layer is the in-plane direction and the thickness direction in the paper layer, but especially in the method of heating with a heat roll, the thickness direction is sandwiched by roll nip or covered with toner. As a result, steam is less likely to diffuse. For this reason, by creating a situation in which vapor easily diffuses in the in-plane direction in the paper layer, it is compatible with a system that continuously supplies paper at high speed by electrophotography, and at the heat fixing unit in high-speed recording with high image quality. No blister occurred, and a toner-receiving continuous paper excellent in toner fixing strength and gloss could be obtained.

In the fixing of the toner, the toner resin component is melted by a heating roll or infrared heating and fixed on the paper, so that the thermal efficiency becomes a problem particularly when printing at a high speed. Therefore, it is preferable that the paper density is low, preferably 0.85 to
It is 1.10 g / cm ³ . Paper density is 0.85g / c
If it is less than m ³ , the rigidity of the paper having a particularly high basis weight becomes high, and when it is used in a roll state, the curl curl becomes stronger as it gets closer to the core, and the paper after printing is made into a sheet. In this case, curling curl may occur, which may be inconvenient. Further, if the density is lowered as described above, it is necessary to greatly relax the calendering condition, and in that case, the surface property is deteriorated and the image density after fixing may be nonuniform. Further, if the density exceeds 1.10 g / cm ³ , problems such as insufficient toner fixing strength may occur especially when used in a low temperature environment such as winter, which is not preferable. Further, the fluctuation of the density in the width direction of the paper should be within ± 10% because the fluctuation of the fixing strength and the fluctuation of the image density and the glossiness become large depending on the toner fixing condition. Is preferred. The paper density depends on the amount of ash in the base paper, the density of the coating layer, the coating amount, and is affected by the papermaking conditions, coating conditions, and finishing conditions, so it should be optimized according to the purpose of use.

The interlayer strength of the paper depends on the type of pulp of the base paper,
It is affected by beating conditions, ash content, addition of paper strengthening agents, papermaking conditions, size pressing agents, size pressing conditions, coating layer materials, coating conditions, water content, calendering conditions and the like. Since these conditions affect the rigidity of paper properties, whiteness, opacity, dimensional stability, etc., it is necessary to appropriately select the above conditions according to the purpose. In order to select the above conditions and suppress blisters, the preferable interlayer strength is 600 to 10
It is 00 g · cm / in ² . Interlayer strength is 600g ・ c
If it is less than m / in ² , blisters may occur during toner fixing. If it exceeds 1000 g · cm / in ² , problems such as back cracking tend to occur when the book is folded and used for binding, and the curl of the roll winding core becomes strong, which may affect running performance. Curl may become a problem when finished into a sheet, which is not preferable. As a preferable physical property of paper, the range of stiffness varies depending on the basis weight, but is 10 to 25 cm in the papermaking direction (hereinafter, also referred to as MD direction), the whiteness is 75% or more, and the opacity is 80%. That is all.

The air permeability of the paper is preferably finished to 5000 seconds or less. As described above, the cause and situation of the occurrence of blisters are water in the heated paper, so the vapor pressure decreases as the air permeability of the paper increases, and the load on the interlayer strength of the paper is reduced. The air permeability is controlled by adjusting the type of pulp fiber, the beating degree, the papermaking conditions, or the hydrophilicity of the pulp in the adjustment of the base paper, and increasing the air permeability by a method such as adding a chemical that suppresses excessive aggregation. In the case of coated paper, the type, particle size and shape of the pigment in the coating layer and the film forming ability of the latex used as the binder influence. Furthermore, after the coating layer is formed, the surface is subjected to a smoothing treatment, and it is desirable that the formed coating layer be highly smoothed with a density as low as possible. For this reason, a method that uses heating and pressure in combination or a method that selects the roll material for the calender that is used for the pressurizing device to lengthen the time that heat and pressure are continuously applied. Is preferably added.

The present invention will be described in more detail below. The pulp used in the present invention is not particularly limited, but for example, LBKP (hardwood bleached kraft pulp), N
BKP (softwood bleached kraft pulp), LBSP (hardwood bleached sulfite pulp), NBSP (softwood bleached sulfite pulp)
Chemical pulps such as can be used. Chlorine-free pulp such as so-called ECF pulp and TCF pulp can be preferably used. In addition, non-wood pulp such as linter pulp, waste paper pulp, GP (ground pulp), T
High-yield pulp such as MP (thermo-mechanical pulp) is used alone or as a mixture of two or more in consideration of the degree of deterioration of formation and the color reproducibility so that the whiteness after coating does not become too low. Can be used. In order to increase the whiteness after coating, the above-mentioned pulp is selected and used for the paper base material, or the use of pulp which is reinforced in the bleaching step of the pulp,
A fluorescent dye may be added to the pulp slurry.

The paper substrate used in the present invention has a high density,
A filler may be added in order to control the surface smoothness and improve the coating suitability, and to adjust the opacity and whiteness after coating. Fillers that can be used here include calcium carbonates such as heavy calcium carbonate and light calcium carbonate, kaolin, silicic acid such as calcined clay, pyrophyllite, sericite, talc, inorganic pigments such as titanium dioxide, and urea resin. , Solid type such as styrene, hollow type,
Alternatively, a through-hole type organic pigment can be used, but the present invention is not limited thereto.

The blending amount of the filler is not particularly limited, but is preferably in the range of 3 to 15% by mass. If the blending amount of the filler is less than 3% by mass, the refraction of light due to the filler may be lowered and the opacity may be lowered. On the other hand, if the blending amount of the filler exceeds 15% by mass, the rigidity of the paper is lowered and the inter-fiber bond in the paper layer of the paper substrate is hindered, so that the interlayer strength may be lowered. The desired interlayer strength may not be obtained, which is not preferable.

Various chemicals such as a sizing agent used for the paper base material of the present invention can be added internally or externally. Examples of the sizing agent include rosin-based sizing agents, synthetic sizing agents, petroleum resin-based sizing agents, neutral sizing agents, and the like. Further, a suitable fixing agent such as a sulfuric acid band or cationized starch is combined. Can also be used. From the viewpoint of paper storability after printing, alkyl ketene dimer,
Neutral sizing agents such as alkenyl succinic anhydride sizing agents are preferred.

For the purpose of adjusting the surface electric resistance value, inorganic substances such as sodium chloride, potassium chloride, calcium chloride, sodium sulfate, zinc oxide, titanium dioxide, tin oxide, aluminum oxide and magnesium oxide, and alkyl phosphate ester salts. , Organic sulfates, sodium sulfonates, quaternary ammonium salts, and other organic materials can be used alone or in combination. In addition to this, a paper strength enhancer, a dye, a pH adjuster and the like may be added. A preferable surface electric resistance value is in the range of 1 × 10 ⁹ to 1 × 10 ¹³ Ω under an environment of 23 ° C. and 50% RH, and by adjusting this range, static electricity in roll feeding is suppressed. In this case, or when the toner is electrically transferred from the photosensitive member or the intermediate transfer member onto the paper, the transfer quality becomes good.

In the toner-receptive continuous paper according to the present invention, a toner-receptive layer can be formed by applying a pigment coating liquid containing a pigment and an aqueous adhesive as a main component on at least one surface of a paper substrate. it can. Examples of coating layer pigments used here include heavy calcium carbonate, light calcium carbonate, titanium dioxide, aluminum hydroxide, satin white, talc, calcium sulfate, barium sulfate, zinc oxide, magnesium oxide, magnesium carbonate, Amorphous silica, colloidal silica, white carbon, kaolin,
Mineral pigments such as calcined kaolin, delaminated kaolin, aluminosilicate, sericite, bentonite, and smectite, and solid, hollow or through-hole organic pigments such as polystyrene resin particles and urea formaldehyde resin particles. Can be used alone or in combination.

As the adhesive used in the coating layer of the present invention, a water-soluble adhesive, an emulsion, a latex or the like, which has a strong adhesive force to an additive such as a paper substrate or a pigment and has little blocking property, or 2 A mixture of two or more species can be used.
For example, polyvinyl alcohol, modified polyvinyl alcohol, starches, gelatin, casein, methyl cellulose, hydroxyethyl cellulose, acrylic acid amide-
Acrylic ester copolymer, acrylic acid amide-acrylic acid-methacrylic acid terpolymer, styrene-acrylic resin, isobutylene-maleic anhydride resin, water-soluble resin such as carboxymethyl cellulose, acrylic emulsion, vinyl acetate Emulsion, vinylidene chloride emulsion, polyester emulsion, styrene-butadiene latex, acrylonitrile-butadiene latex, etc. are used, and one or more of these are selected and used according to the target quality. .

A suitable mixing ratio of the adhesive agent is 5 to 30 parts by mass with respect to 100 parts by mass of the pigment in the coating material for coating layer. When the blending ratio of the adhesive is less than 5 parts by mass, the coating film strength becomes weak, which is not preferable. On the other hand, if it exceeds 30 parts by mass, the voids of the coating layer are filled with the adhesive, the air permeability is lowered, and the occurrence frequency of blisters increases, which is not preferable.

In addition to the above, a dye or a colored pigment for adjusting the color tone may be added to the paint, or a fluorescent dye may be added to improve the whiteness of the visual sense. Further, as the surface electric resistance value adjusting agent, a known material used for the substrate can be used. In addition, dispersants, defoamers, plasticizers, pH adjusters, flow modifiers, solidification accelerators, water resistance agents, release agents, UV absorbers, optical brighteners, etc. to facilitate adjustment of paints. Various auxiliaries can also be added.

The coating amount of the toner receiving layer in the present invention is
Coating is performed with a solid content of 5 to 20 g / m ² per one surface. When the coating amount is less than 5 g / m ² , the coating amount is too small to cover the fibers on the entire surface of the paper substrate, and irregularities between the fibers remain on the surface of the toner-receptive continuous paper, resulting in turbulence. No image can be formed, and sufficient opacity cannot be obtained due to the small amount of pigment. 20g again
If it exceeds / m ² , the effect of improving the image quality is saturated, the air permeability is lowered, and blisters are likely to occur, which is not preferable. Further, the density fluctuation of the paper is closely related to the fluctuation of the coating amount, especially in the case of a low basis weight, and in order to keep the density fluctuation in the width direction within the range of the central value ± 10%, It is necessary to suppress the fluctuation of the amount to the fluctuation of the central value ± 10%. The density fluctuation of this paper is 10 cm x 1 in the width direction of the winding.
Sampling is performed at 0 cm square, individual weight and thickness are measured, and density is calculated. The basis weight of the toner-receptive continuous paper according to the present invention is not particularly specified, but is usually 50 to 50.
The range is about 250 g / m ² .

Examples of the coating method of the coating solution used for forming the toner receiving layer of the present invention include an on-machine coater provided with a coating device such as gate roll coating and size press coating. Any of off-machine coaters such as blade coating, air knife coating, roll coating, bar coating, reverse roll coating, gravure coating, curtain coating, and die coating can be used.

The smoothing treatment after coating can be carried out by using an ordinary smoothing apparatus such as a super calender, a gloss calender or a soft calender. When the smoothing process is appropriately performed on-machine or off-machine, the form of the pressurizing device, the number of pressurizing nips, and the pressurizing temperature are appropriately selected and used according to the purpose.

The air permeability of the smoothed toner-receptive continuous paper is preferably 5000 seconds or less, more preferably 3
000 seconds or less. By the way, if it exceeds 5000 seconds, the frequency of occurrence of blisters during heat fixing increases, which is not preferable. In addition, even if the calendering condition after forming the toner receiving layer is processed at high speed without load when the density is lowered, the variation in the density is ± 10% due to the variation in the coating amount. May occur. In this case, the uniformity of the image density and the glossiness is lowered, which is not preferable.

[0027]

The present invention will be described in more detail below with reference to examples, but the present invention is not limited thereto. In addition, "part" and "%" in an example show "part by mass" and "mass%" unless otherwise specified.

Example 1 A toner-receptive continuous paper was prepared by the following steps. [Preparation of paper base material] LBKP that has been highly whitened by multi-stage bleaching with oxygen exposure etc. has a freeness of 470 ml C.I. S. F.
70 parts of pulp beaten to NBKP, freeness of 500 m
lC. S. F. Per 100 parts (solid content) of a pulp slurry using 30 parts of pulp as a raw material, 0.4 parts of polyacrylamide paper strength agent (PS-678: manufactured by Arakawa Chemical Industry Co., Ltd.), 1 part of sulfuric acid band, light calcium carbonate as a filler ( Softon 1200: Shiraishi Calcium Co., Ltd.) 5 parts, alkenyl succinic anhydride as an internally added sizing agent (Fibran 81: National Starch and Chemical Co.) 0.08
Parts were compounded.

This paper material has a Hunter whiteness of 85 after paper making.
%, Add a small amount of fluorescent dye, and weigh 100
Paper was made with a Fourdrinier cylinder paper machine so as to have g / m ^2, and the dryer conditions were adjusted so that the water content after paper making was 5% by mass. In the size press process, 0.90 of oxidized starch was added.
g / m ^{2 was} applied. Furthermore, the apparent density is 0.80 g / c due to the pressing process and machine calendering process.
A m ³ paper substrate was obtained.

[Preparation of coating liquid] To 100 parts of water, 0.5 part of sodium pyrophosphate was added, and 70 parts of kaolin (lastra: manufactured by Engelhard) and light calcium carbonate having an average particle size of 2 μm (TP-123: Okutama Kogyo Co., Ltd.) (30 parts) was mixed in terms of solid content and dispersed in water using a Cowles disperser to obtain a pigment slurry. To this pigment slurry, 5 parts of oxidized starch (Oji Ace A: manufactured by Oji Cornstarch Co., Ltd.) and 8 parts of SBR (JSR0695: manufactured by JSR Co., Ltd.) were added as a binder in terms of solid content, mixed with water and stirred to give a 20% concentration. A coating liquid was prepared.

[Application of Coating Liquid and Surface Finishing] The coating amount after drying the above coating liquid on both sides of the paper base material is 1 as a solid content.
It was coated with a Mayer bar coater so as to have a weight of 0 g / m ² . The variation in the coating amount in the width direction is 10 ± 1 per side.
Controlled to g / m ² . After the basis weight is set to 120 g / m ² ,
Heat calendering was performed, and the coated surface formed on the felt side of the paper base material had an Oken smoothness of 100 seconds and a water content of 5
It was adjusted to be%. The paper was passed through a heating calendar composed of a metal roll and an elastic roll to obtain a toner-receptive continuous paper. The surface temperature of the metal roll at this time was 80 ° C. After coating the coating material, conditions such as drying were appropriately adjusted, and the water content after the heating calendar was 4.5%.

[Evaluation of Toner Receptive Continuous Paper] The obtained toner receptive continuous paper was subjected to image formation by an on-demand printer of a roll toner type dry toner development and infrared fixing system. After this image was created, the presence or absence of blisters and the non-uniformity of density and gloss were confirmed as a guideline for image quality. Blisters that did not occur at all were evaluated as ◯, minute levels were evaluated as Δ, and swelling was clearly recognized as ×. In addition, the image quality has no unevenness in density or gloss at all, ○, a minute level is within the practical range Δ, and if unevenness in density or gloss is clearly observed ×
And Regarding the toner adhesion strength, the image portion was folded and a metal roll having a weight of 3 kg was reciprocated once, and the degree of toner peeling at this fold and the breakability of the paper were observed with a magnifying glass. If the toner adhesion is the same as the J-coated paper sold by Fuji Xerox Co., Ltd., it is set to Δ, and it is set to a practical level. The paper breakability was rated as ∘ when the integrity of the pulp fibers was maintained, and as Δ when part of the fibers jumped out at the folded portion and was within the practical range. If the paper layer is cracked, there is a problem in practical use.
And

The density of the toner-receptive continuous paper is measured according to JIS
It is measured according to the method described in P 8118. Regarding the fluctuation in the width direction, the sample was divided into at least 10 parts in the width direction, the density of each was measured, and the average value and the fluctuation thereof were measured. The interlaminar strength was measured using an internal bond tester (Kumagaya Riki Kogyo Co., Ltd.). The air permeability is J. TAP
PI No. According to the measuring method described in 5-93, it was measured by an Oken type air permeability measuring device. Table 1 shows the evaluation results of the toner-receptive continuous paper of Example 1.

Example 2 A toner-receptive continuous paper was prepared and evaluated in the same manner as in Example 1. However, 0.5 parts of polyacrylamide paper strength agent (PS-678: manufactured by Arakawa Chemical Industry Co., Ltd.), which is an internal chemical for base paper, was added, and light calcium carbonate (Softon 1200: manufactured by Shiraishi Calcium Co., Ltd.) as a filler was added to 3 parts. changed. The coating amount of the toner receiving layer is 5 g / m ² per side.
And

Example 3 [Preparation of paper base material] LBKP whitened by multi-stage bleaching with oxygen exposure etc. to give whiteness of 400 ml C.I.
S. F. 70 parts of pulp beaten to NBKP and freeness of 400 ml C.I. S. F. Per 100 parts (solid content) of a pulp slurry using 30 parts of the above pulp as a raw material (PS-678: manufactured by Arakawa Chemical Industry Co., Ltd.)
0.5 part, cationized starch (ACE K, manufactured by Oji Corn Starch Co., Ltd.) 0.7 part, sulfuric acid band 1 part, light calcium carbonate (Softon 1200: manufactured by Shiraishi Calcium Co., Ltd.) as a filler, and alkenyl as an internally added sizing agent. Succinic anhydride (Fibran 81: National Starch and
Chemical Co., Ltd.) 0.08 part was blended. In the size press process, 0.9 g / m ² of oxidized starch and NaC were added.
0.1 g / m ^{2 was} applied. [Production of toner-receptive continuous paper] Light calcium carbonate in the coating layer was changed to Arbagros (manufactured by Specialty Minerals Co., Ltd.), and 10 g / m ^{2 was} coated on each side. A toner-receptive continuous paper was prepared and evaluated in the same manner as in Example 1 except for above.

Example 4 Receiving toner in the same manner as in Example 3
A continuous paper was prepared and evaluated. However, the surface size of the base paper
0.4g / m of oxidized starch^TwoAnd polyacrylamide
Resin (ST481H: made by Japan PMC) 0.5 g / m
^TwoIs added, and the basis weight of the base material is 117 g / m. ^TwoAnd See you
The coating amount of the ner receptive layer is 5 g / m on each side.^TwoAnd

Example 5 A toner-receptive continuous paper was prepared and evaluated in the same manner as in Example 4. However, SBR (JSR0695: manufactured by JSR) of the binder of the toner receiving layer
The addition amount is 10 parts, and the coating amount is 20 g / side.
It was m ^2.

Comparative Example 1 A toner-receptive continuous paper was prepared and evaluated in the same manner as in Example 2. However, the basis weight of the base paper is 90 g /
m ² and the coating amount of the toner receiving layer was 25 g / m ² .
The surface treatment was a 7-nip super calendar treatment.

Comparative Example 2 A toner-receptive continuous paper was prepared and evaluated in the same manner as in Example 2. However, the coating amount of the toner receiving layer was 4 g / m ² , and the calender was a normal weight 1 nip treatment at room temperature.

Comparative Example 3 A toner-receptive continuous paper was prepared and evaluated in the same manner as in Example 1. However, the polyacrylamide paper strength agent and the cationized starch, which are the chemicals used for the base paper, were not used.

Comparative Example 4 A toner-receptive continuous paper was prepared and evaluated in the same manner as in Example 3. However, the addition amount of the polyacrylamide paper strength agent (PS-678: manufactured by Arakawa Chemical Industry Co., Ltd.), which is a chemical used for base paper, was 1.2 parts.

[0042]

[Table 1]

[0043]

The toner-receptive continuous paper according to the present invention is
With no blister, high image quality and uniform image and gloss, and excellent toner fixability and fold cracking property. By using the toner receptive continuous paper, a high quality image formed product is selected.
It is extremely useful in practice.

Claims (5)

[Claims] 1. A toner-receptive continuous paper comprising a paper base material mainly composed of pulp fibers, and a toner-receptive layer on at least one surface thereof, wherein the toner-receptive continuous paper has a density of 0.85-1. 10 g / cm ³ and an interlaminar strength of 6
A toner-receptive continuous paper having an air permeability of from 0.00 to 1000 g · cm / in ² and an air permeability of 5000 seconds or less. 2. The coating amount of the toner receiving layer is 5 to 20 g.
The toner-receptive continuous paper according to claim 1, which is / m ² . 3. The toner receiving system according to claim 1, wherein the toner-receptive continuous paper is used in a toner image forming system in which a toner image is formed on the surface of the continuous paper and then the image is formed by a heat fixing method. Sex continuous paper. 4. The toner receptive continuous paper according to claim 1, wherein the toner receptive continuous paper is used in a toner image forming system for forming an image by a method of transferring a toner image from a heated blanket roll. paper. 5. An image-formed product, which is formed with the toner image-forming system according to claim 3 or 4 using the toner-receptive continuous paper.