JPH11198515A - Multicolor stencil printing method and multicolor stencil printing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the reproductivity of color by transferring ink having the largest average particle diameter of a coloring agent contained in ink to an image receptor prior to at least another color in printing operation to be conducted by transferring a plurality of color stencil printing ink to an image receptor in turn. SOLUTION: When a plurality of color inks are superimposed on an image receptor paper, ink having the largest average particle diameter of a coloring agent contained in ink is treated to be transferred to an image receptor prior to at least another color. Upon carrying out this, e.g. yellow ink is filled in the form cylinder 8a of a color stencil printing device, magenta ink is in a form cylinder 8b, cyan ink is in a form cylinder 8c, and black ink is in a form cylinder 8d respectively, and then the manufactured stencil printing papers are wound round the form cylinders 8a-8d in such fashion that they correspond to the color of ink to be filled respectively. Subsequently, the image receptor papers are passed therethrough under pressure in order of the form cylinders 8a-8d for printing. In this way, multicolor stencil printed matter is obtained with superior color reproductivity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a multicolor stencil printing method and a multicolor stencil printing apparatus.

[0002]

2. Description of the Related Art Compared with offset printing, gravure printing, etc., stencil printing requires less maintenance, has lower printing costs, and can easily produce tens to thousands of printed materials at a low cost. There are advantages. But,
Conventional stencil printing has been limited to color printing in which one black color or two or more blacks are added thereto. In view of this situation, there has been proposed a stencil printing method that handles more colors.

For example, Japanese Patent Application Laid-Open No. Sho 60-262684 discloses a stencil printing apparatus that obtains a multicolor stencil printing product with a short waiting time for stencil making by providing a rotating member that supports a plurality of plate cylinders in a cylindrical shape. JP-A-2-24537
No. 3 discloses a copy plate multicolor printing method in which the inside of a plate cylinder is divided into a plurality of ink chambers to obtain a full-color print at a high speed.
Japanese Unexamined Patent Publication No. Hei 6-135113 discloses a multi-color printing method in which the inside of a plate cylinder is divided into a plurality of ink chambers and a full-color printed matter is obtained by providing an offset roller. Japanese Patent Application Laid-Open No. 4-1055984 discloses a multiple stencil printing method for obtaining a multicolor stencil print without color misregistration by devising a feeding action of an image receiving body. JP-A-4-2
Japanese Patent No. 65782 discloses a multi-color printing machine that obtains a full-color printed matter by reducing the printing speed without providing an ink drying unit.

[0004]

However, no stencil printing method or stencil printing apparatus for multicolor printing as described above has been studied at all with respect to the color reproducibility of the printed matter, and the color reproducibility is good. No stencils have been obtained. The purpose of the present invention is to solve this problem,
An object of the present invention is to provide a multicolor printing stencil printing method and a multicolor printing stencil printing apparatus with good color reproducibility by the stencil printing method.

[0005]

Means for Solving the Problems As a result of intensive studies on the stencil printing method, the present inventors have found that the reproducibility greatly changes depending on the order of printing ink. Further, they have found that the printing order is largely affected mainly by the diameter of the colorant particles in the ink, and have reached the present invention.

An object of the present invention is to provide a multicolor stencil printing method in which a plurality of colors of stencil printing inks are sequentially transferred to an image receiving body to perform printing, wherein the average particle size of the colorant contained in the ink is the largest. A multicolor printing stencil printing method in which a large ink is transferred to an image receiving member before at least one other color, or a multicolor printing stencil printing method in which ink having a large average particle diameter of a colorant contained in the ink is transferred to the image receiving member in order. Achieved by the method.

Another object of the present invention is to provide a stencil printing unit for forming a perforated image on a stencil printing paper, and a stencil printing plate having a perforated image wound around the outer peripheral surface of a plurality of plate cylinders. A multicolor printing stencil printing apparatus comprising: a printing unit for sequentially pressing and pressing the ink bodies and sequentially transferring the ink applied to the inner peripheral surface of the plate cylinder to the image receiving body in a perforated image form and performing printing. This is achieved by a multicolor printing stencil printing apparatus that performs printing by a printing method or a multicolor printing stencil printing apparatus that performs printing by the multicolor printing stencil printing method using inks of cyan, magenta, yellow, and black.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The multicolor stencil printing method and the multicolor stencil printing apparatus of the present invention will be described in more detail below. Generally, for multi-color printing, especially full-color printing,
The three colors of cyan ink, magenta ink, and yellow ink are used according to the reproduced color. This is a cyan ink that absorbs red light on white paper that does not selectively absorb incident light,
An appropriate amount of magenta ink that absorbs green light and yellow ink that absorbs blue light are adhered, and the subtractive color mixing method is used in which the amounts of red light, green light, and blue light reflected from the paper are adjusted according to the amount of the adhesion. Each ink contains cyan, magenta and yellow colorants, and pigments or dyes are usually used as the colorants. It is desirable that black ink be used in addition to cyan ink, magenta ink, and yellow ink. The black ink contains a black colorant. For each ink, a preferred pigment or dye is used as a colorant.

When discoloration due to light is considered, a pigment is often used as a colorant, and the pigment exists as an aggregate in the ink film. Since an interface is formed on the surface of the aggregate, scattering of incident light occurs, and the degree of the light scattering depends on the size of the particles of the pigment aggregate and the difference in the refractive index between the pigment and the vehicle. When the pigment type and the vehicle are the same, light scattering mainly depends on the particle size of the pigment aggregate, that is, the particle size. The larger the particle size of the pigment aggregate, the greater the light scattering, resulting in a greater hiding effect. Conversely, the smaller the particle size of the pigment aggregate, the smaller the light scattering, and consequently the smaller the hiding effect.

When a plurality of color inks are superimposed on an image receiving paper,
If the particle size of the pigment aggregate contained in the upper layer ink is large, light scattering occurs, light does not reach the lower layer ink, and as a result, the light absorption of the lower layer ink is not reflected, and the color of the upper layer ink is changed. It becomes darker, the color balance is out of order, and the color reproduction is impaired. When the ink film is thin, the effect of preventing light transmission due to light scattering is small, and the light reaches the lower ink film. As a result, the error in color reproduction is small, and the effect of light scattering can be ignored. When the thickness is large, a large amount of incident light is scattered by the upper layer ink and the light does not reach the lower layer ink, so that the hiding effect by the upper layer ink becomes remarkable, the color balance is disturbed, and color reproduction is impaired.

Therefore, even when the same color inks are combined and printed by the same stencil printing method, the color tone greatly varies depending on the particle size of the aggregate of the colorant such as the pigment contained in the ink. This phenomenon is remarkable in stencil printing in which the amount of ink adhered is larger than in offset printing or gravure printing, and is particularly remarkable when printing solid images such as characters and fills. However, according to the multicolor stencil printing method of the present invention, errors in color reproduction can be reduced. The multicolor stencil printing method of the present invention is excellent in the color reproducibility of multicolor prints or full-color prints of two or more colors, and is particularly effective in solid image portion color reproducibility.

In order to evaluate the color reproducibility of a stencil product obtained by the multicolor printing stencil printing method or multicolor printing stencil printing apparatus of the present invention, the CIEL ^* a ^* b ^* values were measured using a colorimeter or the like, and Japan Color (Japan Color) was used. ) And the color difference ΔE
Can be implemented. Japan color (Japan
n Color) is the International Standards Organization Printing Technical Committee (I
SO / TC 130), which was selected as a standard color in Japan. The selection was made by collecting one point each of the most standard sheet-fed lithographic process inks from eight representative ink manufacturers in Japan, measuring the color values of each one developed under the same conditions, and measuring the average value. It was done with.

[0013] Japan Colo (Japan Colo)
r) is composed of the following four items. (1) Standard ink: Standard Ink SF-
90 (cyan, magenta, yellow, and black offset process inks of four colors) (2) Standard paper: Standard Paper (art paper, basis weight 128 g / m ² , whiteness 80%, gloss 75)
%) (3) Standard color value: Standard Color V
alue (indicated by CIEL ^* a ^* b ^* values and color difference ΔE of eight colors of cyan, magenta, yellow, black, red, green, blue, and white) (4) Standard color sample: Standard Color S
sample (a color sample that embodies the standard color value in $ E using standard ink and standard paper) The standard color sample is the printing technology committee of the International Organization for Standardization (ISO /
(TC130) and is readily available. Therefore, the evaluation of color reproducibility is based on Japan Color (Japan) which is a standard of color in Japan.
an Color) and the color difference ΔE with respect to the color difference.

Specifically, the L ^* a ^* b ^* values of the stencil prints are measured, and the color difference calculation formula (1 formula below) described on page 38 of the Handbook of Printing Engineering is used to calculate Japan Color (Japan).
Color) and the stencil print are calculated. ^{△ Eab = ((△ L *} ) 2 + (△ a *) 2 + (△ b *) 2) 1/2 ···· (1) △ L * = L * 1 -L * 2 △ a * = _{^{a * 1 -a * 2 △ *}} b = b * 1 -b * 2 L * 1, a * 1, b * 1: Japan color (Japan Co
lor) L ^* , a ^* , b ^* values L ^* ₂ , a ^* ₂ , b ^* ₂ : L ^* a ^* b ^* values of stencil prints L of at least red, green, blue, black patches of four colors
By measuring the ^* a ^* b ^* values and calculating the color difference, the color reproducibility of the stencil print can be comprehensively evaluated.

In the present invention, it is preferable to use an emulsion ink in consideration of printability, but an oil-based ink or a water-based ink may be used. In the case of an emulsion ink, the basic configuration is achieved by including a coloring pigment which becomes oily, an emulsifier, and water which becomes an aqueous phase. In addition to this, viscosity adjustment,
Aqueous gelling agent for suppressing volatilization of water, additive for preventing freezing, fungicide, antioxidant, or dispersant for dispersing pigment, additive for improving stability over time, ink film quality Further, a resin or the like for improving the drying property can be contained as needed.

The emulsion ink that can be used in the present invention is preferably a water-in-oil emulsion ink, and the particle size of the aqueous phase is preferably less than 200 μm, more preferably less than 100 μm. The emulsion ink that can be used in the present invention is 10 to
It is preferably a water-in-oil emulsion ink in which 90 to 30% by weight of an aqueous phase component is added to 70% by weight of an oil phase component and dispersed and emulsified.
More preferably, it is a water-in-oil type emulsion ink in which an aqueous phase component of を 60 wt% is added and dispersed and emulsified.

The resin component is added for the purpose of dispersing the colorant, fixing the colorant to a printing medium, and the like. Examples of such a resin include a rosin-modified phenol resin, an alkyd resin, a phenol resin, and a maleic acid resin. , Petroleum resin, rubber derivative resin and the like.

Examples of the coloring agent include known coloring agents such as carbon black, phthalocyanine blue, phthalocyanine green, and liquid.

Examples of the emulsifier include sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan tristearate, sorbitan monooleate, sorbitan triolate, sorbitan higher fatty acid esters such as sorbitan sesquioleate, oleic acid monoglyceride, Examples include fatty acid monoglycerides such as oleic acid diglyceride, and ethylene oxide adducts such as higher alcohols and alkylphenol fatty acids.

Examples of the fungicide include aromatic hydroxy compounds and chlorinated products thereof, phenols and derivatives thereof, sorbic acid, salicylic acid, p-oxybenzoic acid and derivatives thereof, and the like.

In the present invention, the aqueous phase is preferably used in a gelled or thickened state. Viscosity 20-40
0 poise is preferred. Therefore, in the present invention, a water-soluble polymer is contained in the aqueous phase. Examples of the water-soluble polymer include starch, mannan, sodium alginate, galactan, tragacanth gum, gum arabic, burlan, dextran,
Natural polymers such as xanthan gum, glue, collagen, casein; semi-synthetic polymers such as carboxymethyl cellulose, methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl cellulose, hydroxypropylmethyl cellulose, hydroxymethyl starch, dialdehyde starch; polyacrylic acid And polyacrylic acid derivatives such as sodium polyacrylate and triethanolamine polyacrylate; and synthetic polymers such as polyvinyl alcohol, polyvinyl pyrrolidone, polyacrylamide, polyethylene oxide, and polyvinyl methyl ether. Among them, polyacrylic acid derivatives such as polyacrylic acid, sodium polyacrylate and triethanolamine acrylate are preferable because they are effective in a small amount.

In the present invention, as an accelerator for gelling or thickening the water-soluble polymer polyacrylic acid added to the aqueous phase, diisopropanolamine, di-2
(Ethylhexyl) amine, triamylamine, β-
Dimethylaminopropionitrile, dodecylamine, low molecular weight amines such as morpholine and alkanolamines,
In addition, inorganic bases such as sodium hydroxide, potassium hydroxide, and ammonium hydroxide are exemplified.

In producing the emulsion ink of the present invention, the pigment is usually dispersed in the above-mentioned solvent using a known dispersing machine, and the pigment is diluted with a solvent or other oil phase component using a known stirring machine to obtain an oil. Prepare the phases. It is preferred that a poorly hydrophilic additive is added at an appropriate stage of oil phase preparation. The aqueous phase is usually prepared by dissolving and dispersing the aqueous phase components in water using a known stirrer. It is preferable that a highly hydrophilic additive is added at an appropriate stage even in the aqueous phase preparation stage. The oil phase and the aqueous phase thus completed are emulsified by a known emulsifying machine to prepare a target emulsion ink. Production methods and means such as dispersion, dilution, and emulsification can be appropriately changed.

FIG. 1 shows an example of the configuration of a multicolor stencil printing apparatus using the multicolor stencil printing method of the present invention. The configuration is not limited to the configuration shown in FIG. 1 and may be a configuration having two or more plate cylinders each filled with ink of a different color.
The inside of one plate cylinder may be divided into a plurality of ink chambers, and each ink chamber may be filled with ink of a different color. The average particle size of the colorant can be determined by a centrifugal sedimentation method, a conductivity change method, a laser light scattering method, or a direct observation with a micrograph.

The image receiver which can be used in the multicolor stencil printing method and the multicolor stencil printing apparatus may be paper,
A plastic film may be used. The image receiving body comes into contact with a plurality of plate cylinders sequentially while applying pressure. However, when the ink transferred by the first plate cylinder is not fixed, when the ink is contacted with the second plate cylinder, the unfixed part is unfixed. Ink is re-transferred, causing plate smearing. If the transfer accuracy of the image receiving body is not sufficient, the plate stain appears as image doubling (ghost), which causes deterioration in image quality. Therefore, with the aim of promoting ink fixing,
It is preferable to use an ultraviolet curable ink and to mount an ultraviolet irradiation unit. For the same purpose, ink having fluidity when heated in the plate cylinder and losing fluidity when transferred to the image receiving member is used, or a roller for sucking unfixed ink is used. It is preferable to provide it between plate cylinders.

[0026]

Next, the present invention will be described more specifically with reference to examples. Parts here are by weight.

Production method of stencil printing ink (1) Cyan ink (oil phase) Phthalocyanine blue (colorant) 6.0 parts Emulsifier (Ionnet S85: HLB value 1.8 8.0 parts, manufactured by Sanyo Chemical Industries, Ltd.) Dispersion 0.4 parts Spindle oil (high boiling point oil) 66.0 parts Phthalocyanine blue 6.0 parts, Emulsifier 8.0 parts, Dispersant 0.4 parts, Spindle oil 6.0 parts of a three-roll mill was dispersed for 1 hour to prepare a primary dispersion, and the primary dispersion was stirred while adding 60.0 parts of spindle oil to prepare an oil phase. (Aqueous phase) Water 102 parts Methyl parahydroxybenzoate (mold inhibitor) 0.1 part Polyacrylic acid 0.67 parts Triethanolamine 0.67 parts Ethylene glycol 16.67 parts Water in which methyl parahydroxybenzoate is dissolved While stirring, polyacrylic acid and triethanolamine were sequentially added to gel, and further, ethylene glycol was added to prepare an aqueous phase. The oil phase prepared above was added little by little to the aqueous phase while stirring, to produce an emulsion type stencil printing cyan ink having the above composition.

(2) Magenta Ink In the production of cyan ink, magenta pigment (PPE-02, magenta pigment) was used instead of using 6.0 parts of phthalocyanine blue.
A magenta ink for stencil printing was manufactured in the same manner as in the manufacture of the cyan ink except that 6.0 parts of Hoechst Co. was used.

(3) Yellow ink In the production of cyan ink, cyan was used except that 6.0 parts of phthalocyanine blue was used instead of 6.0 parts of yellow pigment (DIC Yellow 4221, manufactured by Dainippon Ink and Chemicals, Inc.). A yellow ink for stencil printing was manufactured in the same manner as the ink was manufactured.

(4) Black ink In the production of cyan ink, a yellow ink for stencil printing was prepared in the same manner as in the production of cyan ink except that 6.0 parts of carbon black was used instead of 6.0 parts of phthalocyanine blue. An ink was manufactured.

(5) The average particle diameters of the four stencil printing inks of cyan, magenta, yellow and black produced according to the method of manufacturing the stencil printing ink were measured by a centrifugal sedimentation method. While stirring 20 mg of the stencil printing ink, 20.0 g of toluene was added and mixed. After separation into a toluene phase and an aqueous phase, only the toluene phase was taken out, and this diluted solution was used as a sample. A diluted solution was prepared and used as a sample. This diluent is centrifuged and settled and the particle size analyzer C
The measurement was performed using an APA-500 (manufactured by Horiba, Ltd.) at a rotation speed of 3000 rpm in a 20 ° C. atmosphere. The average particle size of the four stencil printing inks was as follows. Cyan ink 140nm Magenta ink 160nm Yellow ink 320nm Black ink 80nm

(6) Japan Color (Japan Co.)
lor) of L ^* a ^* b ^* red standard color swatch value Japan Color (Japan Color), green, blue, of the four color patches of black L ^* a ^* b
^* Values were measured using a colorimeter (CR-300, manufactured by Minolta). Table 3 shows the measurement results.

EXAMPLE 1 Using a 400 dpi thermal head mounted on a stencil printing machine VT-3820 (manufactured by Ricoh Company), a stencil printing paper (Preport Master VT-A3II, manufactured by Ricoh Company) was formed as shown in FIG. Was perforated to produce a stencil printing plate. The stencil printing plate was wound around plate cylinders 1, 2, and 3 of a multicolor stencil printing machine shown in FIG. Further plate cylinder 1
With cyan ink, plate cylinder 2 with yellow ink, plate cylinder 3
Are filled with magenta ink, respectively, and image receiving paper (paper for exclusive use of Super Fine; manufactured by Epson Corporation) is used for plate cylinder 1, plate cylinder 2,
Printing was performed by applying pressure in the order of the plate cylinder 3. As a result, a stencil print was obtained in which the ink was transferred to the image receiving paper in the form of patches in the order of cyan ink, yellow ink, and magenta ink. The L ^* a ^* b ^* values of the stencil patches were measured using a colorimeter (CR-300, manufactured by Minolta). Table 3 shows the measurement results. Table 3 shows the color difference (ΔE) between the black patch of Japan Color and Japan Color calculated from the above equation (1).

Examples 2 to 4 Printing was performed in the same manner as in Example 1 except that the inks filled in the plate cylinders 1, 2, and 3 were changed to the inks shown in Table 1, respectively. Was obtained. The L ^* a ^* b ^* values of these stencil patches were measured using a colorimeter (CR-300, manufactured by Minolta). Table 3 shows the measurement results. Table 3 shows the color difference (ΔE) between the black patch of Japan Color and Japan Color calculated from the above equation (1).

Comparative Examples 1 and 2 Printing was performed in the same manner as in Example 1 except that the inks charged in the plate cylinders 1, 2, and 3 were changed to the inks shown in Table 1, respectively. Was obtained. The L ^* a ^* b ^* values of these stencil patches were measured using a colorimeter (CR-300, manufactured by Minolta). Table 3 shows the measurement results. Table 3 shows the color difference (ΔE) between the black patch of Japan Color and Japan Color calculated from the above equation (1).

Example 5 Using a 400 dpi thermal head mounted on a stencil printing machine VT-3820 (manufactured by Ricoh Company), a stencil printing paper (Preport Master VT-A3II, manufactured by Ricoh Company) was formed as shown in FIG. Was perforated to produce a stencil printing plate. The stencil printing plate was wound around plate cylinders 1, 2, and 3 of a multicolor stencil printing machine shown in FIG. Further plate cylinder 1
Was filled with yellow ink and the cylinder 2 was filled with cyan ink, and printing was performed by applying pressure to the image receiving paper (special paper for Super Fine; manufactured by Epson Corporation) in the order of the cylinder 1 and the cylinder 2. As a result, a stencil print of Example 5 was obtained in which green patches overlapping cyan ink and yellow ink were formed in order on the image receiving paper. The L ^* a ^* b ^* values of the stencil patches were measured using a colorimeter (CR-300, manufactured by Minolta). Table 4 shows the measurement results. Also,
The Japan color (Japan C) calculated from the above equation
Table 4 shows the color difference (ΔE) between the color patch (color) and the green patch.

Examples 6 and 7 The printing of Examples 6 and 7 was carried out in the same manner as in Example 5 except that the inks to be charged into the plate cylinders 1 and 2 were changed to the inks shown in Table 2. And the stencil prints of Example 6 in which a blue patch was formed and Example 7 in which a blue patch was formed. The L ^* a ^* b ^* values of these stencil patches were measured using a colorimeter (CR-300, manufactured by Minolta). Table 4 shows the measurement results. Table 4 shows the color difference (ΔE) between the red color patch of Japan Color and Japan Color calculated from the above equation (1).

Comparative Examples 3 to 5 Comparative Examples 3 to 5 were performed in the same manner as in Example 5 except that the inks to be filled in the plate cylinders 1 and 2 were changed to the inks shown in Table 2. The stencil prints of Comparative Example 3, in which a red patch was formed, Comparative Example 4, in which a red patch was formed, and Comparative Example 5, in which a blue patch was formed, were obtained. The L ^* a ^* b ^* values of these stencil print patches were measured using a colorimeter (C
R-300, manufactured by Minolta Co., Ltd.). Table 4 shows the measurement results. Table 4 shows the color difference (ΔE) between the red color patch of Japan Color and Japan Color calculated from the above equation (1).

Example 8 Using a 400 dpi thermal head mounted on a stencil printing machine VT-3820 (manufactured by Ricoh Company), a stencil printing base paper (Preport Master VT-A3II, manufactured by Ricoh Company) was shaped as shown in FIG. Was perforated to produce a stencil printing plate. The shape of the perforations was made different depending on the color of the ink filled in the plate cylinder to be wound, and stencil printing base paper dedicated to each color was produced. Plate cylinder 1 of multicolor stencil printing machine shown in FIG.
Is filled with the yellow ink, the magenta ink in the plate cylinder 2, the cyan ink in the plate cylinder 3, and the black ink in the plate cylinder 4, respectively.
And wound according to the color of the ink to be filled. Further, image receiving paper (paper for exclusive use of Super Fine; manufactured by Epson Corporation) was applied by applying pressure in the order of plate cylinder 1, plate cylinder 2, plate cylinder 3, and plate cylinder 4 to perform printing. As a result, a red patch 1 transferred in the order of yellow ink and magenta ink to the image receiving paper, a green patch 2 transferred in the order of yellow ink and cyan ink, a blue patch 3 transferred in the order of magenta ink and cyan ink In this way, a stencil print of Example 8 in which a black patch 4 to which only the black ink was transferred was formed. The L ^* a ^* b ^* values of the stencil patches were measured using a colorimeter (CR-300, manufactured by Minolta). Table 4 shows the measurement results. Table 7 shows the color difference (ΔE) between the black patch of Japan Color and Japan Color calculated from the above equation (1).

Comparative Example 6 Printing of Comparative Example 6 was carried out in the same manner as in Example 8 except that the inks to be filled in the plate cylinders 1, 2, 3, and 4 were changed to the inks shown in Table 5. Red patch 1 transferred in the order of magenta ink and yellow ink, green patch 2 transferred in the order of cyan ink and yellow ink, blue patch 3 transferred in the order of cyan ink and magenta ink, only black ink The stencil printed matter of Comparative Example 5 in which the black patch 4 to which the color was transferred was formed. The L ^* a ^* b ^* values of these stencil patches were measured using a colorimeter (CR-300, manufactured by Minolta). Table 6 shows the measurement results. Table 7 shows the color difference (ΔE) between each color patch of Japan Color and Japan Color calculated from the above equation (1).

[0041]

[Table 1]

[0042]

[Table 2]

[0043]

[Table 3]

[0044]

[Table 4]

[0045]

[Table 5]

[0046]

[Table 6]

[0047]

[Table 7]

[0048]

According to the method and apparatus of the present invention, printing is performed by transferring a plurality of color stencil printing inks to a receiver in order, so that errors in color reproduction can be reduced. A stencil printed with good color reproducibility can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram of an example of a multicolor stencil printing apparatus.

FIG. 2 is a stencil printing plate used in Examples 1 to 4 and Comparative Examples 1 and 2. (The solid part in the figure is the perforated part)

FIG. 3 is a stencil printing plate used in Examples 5 to 22. (The solid part in the figure is the perforated part)

FIG. 4 is a stencil print of Examples 5 to 22. (The solid part in the figure is the solid image forming part)

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 heat-sensitive stencil sheet 2 platen roller 3 thermal head 4 resistance heating element 5 pulse modulation controller 6 feed roller material 7 printing plate locking means 8a plate cylinder 1 8b plate cylinder 2 8c plate cylinder 3 8d plate cylinder 4 9 Means 10 Ink roller 11 Ink pool 12 Doctor roller 13 Plate discharge roller 14 Plate discharge box 15 Printing paper 16 Retrieval roller 17 Separation roller 18 Toothed belt 19 Separation roller 20 Paper guide plate 21 Registration roller 22 Press roller 23 Paper feed belt 24 Paper transport belt 25 Discharge Tray 26 Printing Plate Guide Plate 101 Thermoplastic Resin Layer 102 Porous Support

Claims (7)

[Claims] 1. A multicolor stencil printing method in which a plurality of colors of stencil printing inks are sequentially transferred to an image receiving body to perform printing, wherein at least one of the inks having the largest average particle size of the coloring agent contained in the ink is used. A multicolor printing stencil printing method, wherein the color is transferred to the image receiving member before one of the colors. 2. A multicolor stencil printing method in which stencil printing inks of a plurality of colors are sequentially transferred to an image receiving body to perform printing, wherein the color receiving agent has an average particle diameter of a colorant which is larger in the ink. A multicolor printing stencil printing method, characterized in that the stencil printing is performed. 3. The multicolor stencil printing method according to claim 1, wherein the stencil printing ink is an emulsion type ink. 4. The stencil printing method according to claim 1, wherein the stencil printing ink contains at least a colorant, and the colorant is a pigment. 5. The multicolor stencil printing method according to claim 4, wherein said colorant is selected from cyan, magenta, yellow, and black. 6. A stencil making section for forming a perforated image on a stencil sheet, and a stencil printing plate having the perforated image wound around the outer peripheral surface of a plurality of plate cylinders, and an image receiving body is sequentially pressed against the stencil printing plate; A multicolor printing stencil printing apparatus comprising: a printing unit for performing printing by sequentially transferring ink applied to the inner peripheral surface of the plate cylinder onto the image receiving body in a perforated image form, and performing printing.
A multicolor printing stencil printing apparatus characterized in that printing is performed by the multicolor printing stencil printing method described in 4 or 5. 7. A stencil making section for forming a perforated image on a stencil printing paper, and a stencil printing plate having the perforated image wound around the outer peripheral surfaces of four plate cylinders, and an image receiving body is sequentially pressed against the stencil printing plate; A multicolor printing stencil printing machine having a printing unit for sequentially transferring each color ink of cyan, magenta, yellow and black applied to the inner peripheral surface of the plate cylinder in a perforated image form on the image receiving body and performing printing. Item 1, 2, 3 or 4
A multicolor printing stencil printing apparatus characterized in that printing is performed by the multicolor printing stencil printing method described in (1).