JP3517693B2 - Manufacturing method of master for thermosensitive stencil printing - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a heat-sensitive stencil printing master.

[0002]

2. Description of the Related Art A porous thin paper or the like as an ink permeable support (hereinafter sometimes simply referred to as "support") is adhered to a thermoplastic resin film (hereinafter sometimes simply referred to as "film") with an adhesive. Further, there is known a heat-sensitive stencil printing master in which a stick preventing layer for preventing sticking with a thermal head is provided on the film surface. In fact,
As a porous thin paper, a heat sensitive stencil printing master is widely used in which a film is attached to a hemp fiber or a mixture of hemp fiber and synthetic fiber or wood fiber with an adhesive, and a sticking prevention layer is provided on the film surface. .

However, in such a conventional heat-sensitive stencil printing master, (1) a large amount of adhesive is accumulated like a bird's web in the portion where the overlapping portion of the fiber and the film are in contact with each other in the support, and the thermal portion of Drilling by the head is less likely to occur. In addition, that portion impedes the passage of ink, resulting in uneven printing. (2) The fibers themselves impede the passage of ink, resulting in uneven printing. Further, (3) the fiber is expensive, the loss due to the laminating process is large, and the heat-sensitive stencil printing master is expensive. In addition, there are still some problems such as environmental protection problems caused by fiber manufacturing and disposal.

Considering these points, some heat-sensitive stencil printing masters have been proposed. For example, Japanese Patent Laid-Open No. 3-1
Japanese Patent No. 93445 discloses a support using ultrafine fibers having a fineness of 1 denier or less. This solves the problem (1), but leaves the problems (2) and (3).

Japanese Unexamined Patent Publication (Kokai) No. 62-198459 also discloses a method of forming a regular heat-resistant resin pattern having a substantially closed shape on a film by using a printing method such as gravure, offset or flexo. ing. However, it is difficult to print a pattern having a line width of 50 μm or less with the current printing technique, and even if it is possible, the productivity is poor and the cost is high. Moreover, in general, when the line width is 30 μm or more, the heat resistant resin blocks the perforation by the thermal head and causes printing unevenness.

Further, in JP-A-4-7198, for heat-sensitive stencil printing, a mixed solution of a water-dispersible polymer and fine particles such as colloidal silica is applied on the film surface and dried to form a porous layer. A method of producing a master, making a plate using a print Gokko plate making machine [made by Riso Kagaku Kogyo Co., Ltd.], and printing using an EPSON or HG-4800 ink (for inkjet system) is disclosed. The resulting porous layer does not pass through the printing ink well, and the conventional heat-sensitive stencil printing ink is not practical because a sufficient density cannot be obtained during printing. In addition, this layer itself does not have a sufficient heat insulating effect and is inferior in perforability.

However, Japanese Laid-Open Patent Publication No. 54-33117 discloses a printing master which is substantially composed of a film without using a support, and according to this, the above (1) (2) ( Although the problem of 3) is solved, it also creates a new problem. It ’s one film
When the thickness is 0 μm or less, the “stiffness” (stiffn)
Ess) is weak and it becomes difficult to carry. As a solution to this problem, in Japanese Examined Patent Publication No. 5-70595, the film is wound around the peripheral wall of the plate cylinder of the printing machine in a long shape without being cut, and during printing, the entire film rotates together with the rotation of the plate cylinder. The idea to do is presented. However, in this method, since the film and the plate discharge unit rotate together with the rotation of the plate cylinder during printing, the moment of rotation becomes large, and the displacement of the center of gravity from the rotation axis is large,
To solve these problems, the printing press has to be large. Further, when the film has a thickness of 5 μm or more, its thermal sensitivity becomes small and it becomes difficult to perforate with a thermal head. In addition, the energy from the heating means is lost to the platen through the master at a high rate, so that the energy used for perforation is small and it is difficult to perforate.

The inventor of the present invention, in order to solve the above problems, Japanese Patent Application Nos. 7-139918 and 7-3051.
No. 02 etc. were applied. In these inventions, a porous resin film is provided on one surface of a thermoplastic resin film, in which the total opening area of holes having a diameter of 5 μm or more when converted to a perfect circle is in the range of 4 to 80% of the total surface area. Is a master for heat-sensitive stencil printing.

The above-mentioned master for stencil printing is preferably manufactured by applying a resin solution for forming a porous resin film to a very thin (0.5 μm to 5 μm) film from the viewpoint of the sensitivity of the plate making. . Further, the coating amount is because the porous resin film serves as a support for the film,
Not a few. However, when this coating solution was applied to a thin film, wrinkles were likely to occur at the boundary between the coating solution and the film in the vicinity of the end portion of the coating solution in the process of drying. However, as shown in FIG. 3, it is possible to reduce the occurrence of the wrinkles by sufficiently securing the edge portion of the film on which the coating liquid is not applied, but a preferable method from the viewpoint of cost. However, if there is no room for expanding the film width in the width direction of the coating machine, it is impossible to adopt this means.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the circumstances of the prior art as described above, and is provided on at least one surface of a thin (0.5 μm to 5 μm) thermoplastic resin film. In the heat-sensitive stencil printing master having a porous layer, in the process of drying the coating solution of the porous layer, wrinkle does not occur at the position where the film is in contact with the end of the coating solution. It is intended to provide a manufacturing method.

[0011]

Means for Solving the Problems As a result of various investigations on the method of producing a master for heat-sensitive stencil printing, the present inventors have found that one side of a thermoplastic resin film having a thickness of 0.5 to 5 μm. the method of manufacturing a heat-sensitive stencil master having a porous layer, when the coating of the coating liquid for forming the porous layer, the adhesion amount of the coating solution near the end of the off Irumu is, the coating liquid When the coating is applied in such a manner that it gradually decreases in a width of 30 times or more and 1000 times or less of the thickness and becomes substantially zero at the end , the coating solution and the film in the vicinity of the end are dried when the coating solution is dried.
It found that there is no occurrence of wrinkles at the boundary between. The present invention has been made thereby.

Therefore, according to the present invention, (1) a method for producing a heat-sensitive stencil printing master having a porous layer on one surface of a thermoplastic resin film having a thickness of 0.5 to 5 μm, At the time of applying the coating liquid for forming the layer, the amount of the coating liquid adhered to the thermoplastic resin film
Near the edge of the film, 30 times the thickness of the coating liquid or more 100
A method for producing a master for heat-sensitive stencil printing, which is characterized in that the coating is carried out such that the width is gradually reduced in a width of 0 times or less and becomes substantially zero at the end, (2) In the above (1), the porous There is provided a method for producing a master for heat-sensitive stencil printing, characterized in that a coating solution applying means for forming a layer is selected from a gravure roll coat, a die coat and a wire bar coat.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail below. The surface of the porous layer (porous resin film) of the heat-sensitive stencil printing master used in the present invention is as shown in FIG. In the present invention, the coating amount of the coating solution of the porous resin film in the vicinity of the end portion of the film is gradually reduced in a width of 30 times or more and 1000 times or less of the thickness of the coating solution at other locations ,
The coating is applied so that the edge becomes substantially zero (FIG. 2). If this value is 30 times or less, wrinkles will occur on the film at the boundary between the coating liquid and the film near the edges . This wrinkle extends to the porous resin film, and as a result, a portion where the density is high or low is generated in the printed image. Further, when this value is 1000 times or more, the width of the coating machine is unnecessarily widened to increase the cost of the manufacturing machine, as well as lower the product yield and increase the product cost.

[0014] As the coating means of the porous resin film to achieve the above condition, slit die coating, gravure roll coating, it is preferably a wire bar coating, near the edge of the full Irumu if these means, the coating liquid It is easy to carry out the coating so that the amount of adherence of the coating solution is successively reduced in a width of 30 times or more and 1000 times or less of the thickness of the coating solution and becomes substantially zero at the end.

The slit die coating is the most preferable method as a specific means for controlling the amount of the coating liquid deposited in these cases. It is possible to freely change the shape of the slit, and by gradually narrowing both end portions of the slit so as to correspond to the manufacturing method of the present invention, the amount of the coating liquid transferred (coated) on the film can be adjusted. You can control. Further, almost all the liquid extruded from the slit die adheres to the film and does not return to the circulation tank, so that the change of the coating liquid due to the evaporation of the solvent can be suppressed to the minimum. Another reason is that it is easy to add the temperature adjusting means to the slit die portion.

Further, in the case of a gravure roll, the depth of the grooves at both ends of the engraved portion may be gradually reduced or the width of the grooves may be narrowed, or the interval between the grooves may be gradually increased, and as a result, per unit area. The number of grooves may be reduced, the grooves may be thinned, or a combination of these may be implemented. On the contrary, if the gap between the grooves is narrowed or the number of grooves is increased and the width of the groove is narrowed or the depth of the groove is decreased, the coating liquid can be applied uniformly. As a result, it becomes possible to reduce the adhesion amount, which is a more desirable means. As a matter of course, it is also possible to control the temperature of the gravure roll itself by passing a heating medium through the roll to control the pore diameter of the porous resin film.

Further, in the case of a wire bar, the depth of the grooves at both ends is applied with resin or the like to make it shallow so that it is transferred (applied) onto the film so as to correspond to the manufacturing method of the present invention.
The amount of coating liquid applied can be controlled.

However, also by other means, after uniformly coating, the amount of coating liquid as described in the present invention is achieved by a method such as scraping off with a blade or blowing compressed air. It is possible to do so.

The porous resin film of the heat-sensitive stencil printing master used in the present invention has a completely different structure from the porous portion of the conventional heat-sensitive stencil printing master. The solid portion forming the structure (porous portion) is composed of an aggregated joined body of indefinite rods, spheres, and branches, and what kind of structure is formed depends on manufacturing conditions of the porous resin film, for example, resin It depends on the type, the solid content concentration of the resin liquid, the temperature of the resin liquid, the type of solvent, the amount of the resin liquid attached, the drying temperature of the resin liquid, the temperature of the coating atmosphere, the humidity, and the like.

Particularly, the influence of the temperature of the resin liquid, the temperature of the coating atmosphere, and the humidity is great. When the temperature of the resin liquid is 10 ° C. or lower, gelation of the resin liquid is likely to occur, making it difficult to apply the solution, and conversely, 30 ° C. even on a thermoplastic resin film.
If it exceeds, it becomes difficult to form a porous resin film. Further, when the humidity of the atmosphere during application of the solution exceeds 50% RH, the amount of water adsorbed on the film surface increases, and as a result, the leaking property with the coating solution decreases and the adhesiveness between the porous resin film and the film decreases. Will be inferior to.

The porous resin film may be any one having a structure having a large number of voids inside and on the surface of the film, and the voids have a continuous structure in the thickness direction in the porous layer from the viewpoint of ink permeability. It is preferable that the film penetrates in the ceiling direction when the film is used as the floor. However, at the boundary between the porous resin film and the film, the porous resin film may cover and close the film as long as the perforation by the thermal head is not hindered. The thickness of the resin that constitutes the porous resin film that covers the film, which does not hinder the perforation by the thermal head, differs depending on the type of resin that constitutes this film, the thermal sensitivity of the film, etc., but generally the thickness combined with the film is It is 7 μm or less.

The number average pore diameter of the porous resin film is generally 1 μm.
m or more and 50 μm or less, preferably 2 μm or more and 30 μm or less. If the number average pore size is less than 1 μm, the ink permeability is poor, and if a low viscosity ink is used in order to obtain a sufficient ink passage amount, image bleeding or side portions of the printing drum or winding may occur during printing. The phenomenon that the printing ink seeps out from the rear edge of the master occurs. In addition, the porosity in the porous resin film is often low, and it becomes easy to hinder the perforation by the thermal head. If the number average pore diameter exceeds 50 μm, the effect of suppressing the ink by the porous resin film is lowered, and the ink between the printing drum and the film is excessively extruded during printing, causing problems such as back stain and bleeding.
If the pore size of the porous resin is too small or too large, good printing quality cannot be obtained.

On the surface of the porous resin film, the total opening area of holes having a diameter of 5 μm or more in terms of a perfect circle is 4 of the total surface area.
It is -80%, preferably 10-60%. If this ratio is less than 4%, perforation by the thermal head and ink passage are likely to be hindered. The thickness of the porous resin film is 5 μm or more and 100 μm or less, and preferably 6 μm or more and 50 μm or less. If the thickness is less than 5 μm, it is difficult to obtain sufficient stiffness, and the porous resin film is less likely to remain behind the perforated portion after perforation by the thermal head, and the ink transfer amount is not controlled and the back stain of the printed matter deteriorates. easy. Further, the effect of suppressing the ink transfer amount of the porous resin film is greater as the film is thicker, and the ink transfer amount to the paper during stencil printing can be adjusted by the thickness of the porous resin film. When the number average pore size of the voids in the porous resin film is 20 μm or less, the thicker the porous resin film is, the more difficult it is for the printing ink to pass through. Therefore, the thickness of the porous resin film determines the transfer amount of the ink to the printing paper. Can be controlled. If the thickness of the porous resin film is not uniform, uneven printing may occur, so that the thickness is preferably uniform. The thickness is measured with virtually no load or with a very small load.

The amount of the porous resin film attached is 0.5 to 25 g /
m ² , preferably 2 g / m ^{2 to} 15 g / m ² , especially 4-1
2 g / m ² is desirable. If this adhesion amount is 0.5 g / m ² or less, the effect of strengthening the elasticity is small, and conversely, 25 g / m ²
In the above, the printing ink is prevented from passing and the image quality is deteriorated. The density of the porous resin film is usually 0.01 g / cm ³ or more and 1 g
/ Cm ³ or less, preferably 0.1 g / cm ³ or more and 0.6
It is g / cm ³ or less. When the density is 0.01 g / cm ³ or less, the strength of the film is insufficient, and it is difficult to obtain a desired stiffness,
The membrane itself is also fragile. When the density is 1 g / cm ³ , the printing ink is prevented from passing and the image quality is deteriorated.

The stiffness of the heat-sensitive stencil printing master obtained in the present invention is preferably a flexural rigidity of 5 mN or more (according to a Lorenzen stiffener tester). When the bending rigidity is less than 5 mN, it may be difficult to convey the heat-sensitive stencil printing master on the printing machine.

The heat-sensitive stencil printing master obtained in the present invention has a thermoplastic resin film surface having an opening area ratio of 20%.
When perforated as described above, the value measured by the breathability tester is 1.0 cm ³ / cm ² · sec to 157 cm ³ / c.
It is preferably in the range of m ² · sec.

The term "open area ratio" as used herein means the amount of through-holes in the film surface of the heat-sensitive stencil master when the heat-sensitive stencil master is subjected to solid plate making with a thermal head, laser, flash lamp or the like. The total area is
It is the ratio of solid area per unit area. When the opening area ratio is less than 20%, it is necessary to use a stencil printing ink having a very low viscosity in order to secure an image density. The reproducibility of is not good.

On the other hand, if the air permeability is less than 1 cm ³ / cm ² · sec, the ink permeability is poor, and if a low viscosity ink is used to obtain a sufficient ink passage amount, image bleeding or printing during printing occurs. The phenomenon that the printing ink seeps out from the side of the drum and the trailing edge of the wound master occurs. Further, the lower porosity in the porous resin film tends to hinder the perforation by the thermal head. Breathability is 157 cm ³ /
If it exceeds cm ² · sec, the ink suppression effect of the porous resin film will be reduced, and during printing, the ink between the printing drum and film will be excessively extruded, causing problems such as thin dirt and bleeding, and air permeability. Is too small or too large to obtain good print quality.

In order to make the perforation of the porous resin film by the thermal head more effective, it is desirable to soften the film at a temperature of 150 ° C. or lower. The pore size, shape,
In order to adjust the strength and the stiffness, it is preferable that the porous resin film contains a pigment.

The first method of forming a porous resin film is to coat a film with a good solvent solution of a resin, deposit a poor solvent of the resin on the coated surface before the solvent is completely evaporated, and then dry it. A porous resin film is formed. As a method of adhering the poor solvent of the resin to the coating surface, (1) "evaporation latent heat when the good solvent evaporates" and "moisture in air due to temperature decrease on the good solvent solution coating surface due to" contact with chilled roll " Condensation of (poor solvent), (2) spraying the poor solvent onto the coated surface with a humidifier or a sprayer, and (3) simultaneously performing (1) and (2), but in any case, it is a good solvent for the resin. It is desirable that the temperature of the solution be once lowered immediately after coating. Since the diameter of the pores of the porous resin film tends to increase as the temperature decreases, the amount of poor solvent can be reduced.

The second forming method is a method in which a good solvent and a poor solvent are mixed in the coating solution from the beginning. If the proportion of the good solvent is large, the pores are small, and if the proportion of the poor solvent is large, the pores are large. There is an appropriate mixing ratio for obtaining pores of 1 μm to 50 μm, but in this case, at the liquid temperature of 10 to 20 ° C., the resin is precipitated in the liquid and this becomes a lump in the porous resin film after drying. It mixes in and blocks the passage of ink.

To prevent the precipitation of resin, it is preferable to raise the liquid temperature. However, if the liquid temperature remains high and dried, pores will not be formed, or even if they are formed, the pore diameter will be small. Therefore, it is desirable that the liquid temperature be low after the coating liquid has adhered to the film, and then full-scale drying is performed.
The temperature difference is 2 ° C to 30 ° C, preferably 5 to 20 ° C. If the temperature difference is less than 2 ° C, the effect of enlarging the pores is small, and if it exceeds 30 ° C, it is difficult to control the liquid temperature (particularly in the width direction). The temperature of the coating solution in the tank may be raised in order to raise the temperature of the liquid when it is attached to the film, but it is particularly preferable to use a coating means having a temperature adjusting means in the coating portion. Above all, it is desirable to use a slit die. The reason is that almost all the liquid extruded from the slit die adheres to the film and does not return to the circulation tank, so that the change in the coating liquid due to the evaporation of the solvent is suppressed to a minimum.

The resin material constituting the porous resin film of the master for heat-sensitive stencil printing used in the present invention includes polyvinyl acetate, polyvinyl butyral, polyvinyl acetal,
Vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinylidene chloride copolymer, vinyl chloride-acrylonitrile copolymer, styrene-acrylonitrile copolymer, and other vinyl-based resins, polybutylene, nylon and other polyamides, polyphenylene oxide, (meth) acrylic acid ester, polycarbonate , Cellulose derivatives such as acetyl cellulose, acetyl butyl cellulose, and acetyl propyl cellulose. However, the resin that can be used is not limited to these.

The thermoplastic resin film of the heat-sensitive stencil printing master used in the present invention is a vinyl chloride-vinylidene chloride copolymer film, polypropylene film, polyester film or the like which has been conventionally used for heat-sensitive stencil printing masters. Can be used, but a polyester film having a melting energy of 3 to 11 cal / g (see JP-A-62-149496) and a crystallinity of 30%
The following polyester films (JP-A-62-28298)
No. 3), butylene terephthalate unit 50m
Polyester film containing ol% or more (JP-A-2-15)
A polyester film that can be perforated with low energy, such as Japanese Patent No. 8391) is preferable.

Also in the heat-sensitive stencil printing master used in the present invention, a stick preventing layer for preventing sticking with the thermal head can be provided on the surface of the film. In this case, the stick inhibitor used is
The thing generally used by the conventional master for heat sensitive stencil printing can be used. For example, a silicone type release agent, a fluorine type release agent, a phosphoric acid ester type surfactant, etc. can be illustrated.

[0036]

EXAMPLES The present invention will be described in detail with reference to Examples and Comparative Examples. Parts herein are by weight.

Example 1 Cellulose acetate butyrate (softening point 131 ° C.) 5 parts (Eastman Kodak Co., CAB381-20) methyl ethyl ketone (boiling point 79.6 ° C.) 85 parts water (boiling point 100.0 ° C.) 5 parts methyl Alcohol (boiling point 64.5 ° C.) 5 parts A liquid having the above composition was dissolved with stirring, allowed to stand and sufficiently defoamed to obtain a coating liquid 1. Using this coating liquid 1, a coater head part was adjusted to an atmosphere of 30 ° C. and 90% RH to coat a wire bar [0.6 mm diameter, but both ends on a 3.5 μm-thick biaxially stretched polyester film. The portion of the wire which is to be the valley of the wire is filled with melamine resin so that the amount of adhesion gradually becomes almost zero. (Width of 10 mm)]. A porous resin film was formed on the film under the condition that this was allowed to pass through the same atmosphere for 1 minute and then dried in a 50 ° C. drying box for 2 minutes to obtain a master original sheet for heat-sensitive stencil printing. At this time, the liquid adhesion amount of the coating liquid was gradually reduced in the vicinity of the edge portion of the film, so that wrinkles did not occur in the dryer.

Comparative Example 1 Coating liquid 1 was applied in the same manner as in Example 1 except that the end portion of the wire bar was left unprocessed. At this time, the edge of the film of the coating liquid
Since the amount of liquid adhered in the vicinity of the part was drastically changed, it was not possible to prevent the generation of wrinkles in the dryer.

Example 2 Polyvinyl butyral (softening point 87 ° C.) 4 parts (manufactured by Denki Kagaku Kogyo KK, PVB3000-2) Ethyl alcohol 35.5 parts Water 11.5 parts Needle-like magnesium silicate 0.8 parts (Misawa Chemical Co., Ltd. Ace Plus SP) polyvinyl butyral resin manufactured by K.K. was dissolved in a mixed solution of ethyl alcohol and water, and then needle-shaped magnesium silicate was added thereto. Using this coating liquid 2,
The coater head part was adjusted to 23 ° C. and 60% RH atmosphere, and a slit die [slit width 1.0 m was formed on a 2.0 μm-thick biaxially stretched polyester film.
However, both end portions of the slit are tapered. (For a width of 20 mm)].
Under the condition that this is passed through the same atmosphere for 20 seconds and then dried in a 50 ° C. drying box for 2 minutes,
A porous resin film was formed on the film to obtain a master original sheet for heat-sensitive stencil printing. At this time, the edge of the film of the coating liquid
Since the amount of liquid adhered in the vicinity was gradually decreasing,
There were no wrinkles in the dryer.

Comparative Example 2 Coating liquid 2 was applied in the same manner as in Example 2 except that the end portion of the wire bar was left unprocessed.
At this time, the coating liquid for the liquid adhesion amount near the edge of the film has changed abruptly, could not prevent occurrence of wrinkles in the dryer.

Example 3 Polyvinyl butyral (softening point 87 ° C.) 4 parts (PVB3000-2 manufactured by Denki Kagaku Kogyo KK) Ethyl alcohol 35.5 parts Water 11.5 parts Polyvinyl butyral resin in a mixture of ethyl alcohol and water To be a coating liquid 3. A gravure roll (spiral groove groove angle of 45 degrees, on a biaxially stretched polyester film having a thickness of 2.0 μm, was obtained by using the coating liquid 3 and a coater having a coater head portion adjusted to an atmosphere of 24 ° C. and 25% RH. Groove cross section right angled isosceles triangle, cell volume 200 cm
³ / m ² , but the end portion is engraved so that the depth becomes gradually shallower (width 15 mm)].
Under the condition that this is passed through the same atmosphere for 20 seconds and then dried in a 50 ° C. drying box for 2 minutes,
A porous resin film was formed on the film to obtain a master original sheet for heat-sensitive stencil printing.

Comparative Example 3 The coating liquid 3 was applied in the same manner as in Example 3 except that the engraving depth at the end of the gravure roll was not gradually reduced. At this time, the coating liquid near the edge of the film
Since the amount of liquid adhering to the side was drastically changed, it was not possible to prevent the generation of wrinkles in the dryer.

Table 1 summarizes the coating liquid thickness and other evaluations.

[Table 1]

[0044]

According to the present invention, when the coating liquid for forming the porous layer on one surface of the thermoplastic resin film is applied,
At the boundary between the coating liquid and the film, when the amount of the coating liquid adhered is gradually reduced in a width of 30 times or more and 1000 times or less of the thickness of the coating liquid and becomes substantially zero at the end, upon drying, near the edge of the full Irumu heat-sensitive stencil master no wrinkles obtained.

[Brief description of drawings]

FIG. 1 is a view obtained by observing an electron microscope of a porous layer of a heat-sensitive stencil printing master obtained by the method of the present invention.

FIG. 2 is a schematic diagram for explaining a coating state of a coating liquid of the present invention.

FIG. 3 is a schematic diagram for explaining a coating state of a conventional coating liquid.

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-6-99677 (JP, A) JP-A-8-332784 (JP, A) JP-A-62-198459 (JP, A) JP-A-8- 332785 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B41N 1/24 102

Claims (2)

(57) [Claims] 1. A method for producing a heat-sensitive stencil printing master having a porous layer on one surface of a thermoplastic resin film having a thickness of 0.5 to 5 μm, which comprises a coating solution for forming the porous layer. during coating, the deposition amount of the coating liquid, thermoplastic
In the vicinity of the end portion of the sexual resin film sequentially decreased in 30 times 1000 times the width of the thickness of the coating liquid, heat-sensitive stencil which is characterized in that the substantially coated so as to be zero at the end Master manufacturing method. 2. The coating solution applying means for forming the porous layer is selected from gravure roll coating, die coating and wire bar coating.
The method for producing a master for heat-sensitive stencil printing according to 1.