JP2002029169A - Master for heat sensitive stencil printing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent wrinkles from developing at the thermal plate-making of a master, which is produced by coating a porous layer on a thermoplastic resin film. SOLUTION: In the master for a heat sensitive stencil, in which the porous layer is coated on the stretched thermoplastic resin film, Sm is the maximum stress developing under the state that the film is heated from the normal temperature and the porous layer has a rate of deformation of 20% or less when a force of Sm is applied at 60 deg.C to the porous layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a master for heat-sensitive stencil printing (master), and more particularly to a master for heat-sensitive stencil printing in which a porous layer is coated on a stretched thermoplastic resin film.

[0002]

2. Description of the Related Art Conventionally, a porous thin paper or nonwoven fabric as an ink-permeable support is bonded to a thermoplastic resin film with an adhesive, and a stick prevention layer for preventing a stick with a thermal head on the surface of the film. Is known. In practice, a stretched polyester film, mixed with hemp fiber, synthetic fiber, wood fiber, etc. as a support, as a Japanese paper, is bonded with an adhesive,
In addition, a master provided with a stick prevention layer on a film surface is widely used.

However, the above-mentioned conventional master has the following problems. (1) A large amount of adhesive accumulates in the form of a bird's web in a portion where the film is in contact with the portion where the fiber overlaps, making it difficult for the thermal head to pierce that portion. In addition, the portion hinders the passage of ink, and printing unevenness occurs. (2) The fibers themselves impede the passage of ink, causing printing unevenness. (3) Porous thin paper, nonwoven fabric, etc. are expensive, and the loss due to lamination is large, and the master becomes expensive. (4) When the printed papers overlap, a set-off occurs in which the ink adheres to the back surface of the paper overlaid thereon.

Some masters have been proposed in consideration of these problems. For example, JP-A-3-193445 discloses an ink-permeable support using ultrafine fibers having a fineness of 1 denier or less. According to this, the problems (2) and (4) are solved, but (1) and (3)
The problem remains. Also, Japanese Patent Application Laid-Open No. 54-3311
Japanese Patent Application Laid-Open No. 7-133, discloses a master which does not use a support and is substantially composed of only a film, which solves the problems (1), (2) and (3). On the other hand, the stiffness of the master is low, which causes a problem in conveyance and handling in the printing press.

As a means for solving these problems, Japanese Patent Application Laid-Open No. Hei 10-24667 discloses a master in which a mixed solution containing a resin, a good solvent and a poor solvent is applied to a film and dried to form a porous layer. ing. During the drying process, the resin is precipitated by the relative increase of the poor solvent due to evaporation of the good solvent during the drying process, the concentration of the liquid, etc., and the resin is dried to form a porous layer consisting of a three-dimensional network structure on the film. You. Japanese Unexamined Patent Application Publication No. 11-
JP-A-235885 discloses a master in which a fluid mainly composed of a W / O (water-in-oil) emulsion is applied onto a film and dried to form a porous layer.

Certainly, a master in which a porous layer is formed on a film by these coatings has excellent characteristics such as a high-quality image, a small set-off, and ease of transportation and handling as compared with a master known up to now. The problem of sagging wrinkles during plate making occurred.

[0007]

The cause of the sagging wrinkles is the lack of rigidity at the time of biaxial stretching for imparting heat sensitivity to the film and the heating of the porous layer. That is, when the stretched film is perforated in accordance with an image signal using a thermal head, a laser, or the like, in the vicinity of the hole, the latent stress generated by the stretching is released due to the heat of the plate making, and the film shrinks. In addition, the mechanical balance between the perforated portion (image portion) and the non-perforated portion (non-image portion) is broken, and a slack wrinkle is generated in the non-perforated portion (non-image portion). When there is a Japanese paper-like support in contact with the film, the support suppresses shrinkage of the film.

To solve the sagging wrinkle, Japanese Patent Application Laid-Open No. 6-198
No. 833 proposes to apply a constant tension to the film at the time of plate making before and after the running direction. Japanese Patent No. 2856632 proposes a plate making apparatus having a pressing roller for pressing a master immediately after plate making against a platen roller. These countermeasures were effective in plate making with a small plate making area or with only characters without solid images, but they were not perfect. Of course, unstretched films are less likely to cause sagging wrinkles, but have low thermal sensitivity and are not practical.

The present invention has been made in view of such a background, and is directed to a master in which a porous layer is provided on a stretched thermoplastic resin film by coating. It is an object of the present invention to provide a master that does not generate slack wrinkles.

[0010]

Means for Solving the Problems The present inventors have studied the above problems, and have found that the maximum stress generated when various films were heated from room temperature and the magnitude of deformation when temperature and force were applied to the porous layer. As a result of pursuing the effect on sagging wrinkles, the present invention has been achieved.

That is, according to the present invention, first, in a master for heat-sensitive stencil printing in which a porous layer is coated on a stretched thermoplastic resin film, the maximum value generated when the film is heated from normal temperature When the stress is Sm, the heat-sensitive stencil master has a deformation rate of 20% or less when the porous layer is subjected to a force of Sm at 60 ° C. When a force equal to the maximum stress generated in the film upon heating is applied to the porous layer as described above,
When the deformation ratio is not more than 20%, the porous layer can suppress shrinkage of the film at the time of plate making, and can maintain excellent image quality and little set-off.

Second, in the heat-sensitive stencil printing master described in the first aspect, the porous layer has a diameter of 0.1 to 15 μm in terms of a circle and a length of at least three times the diameter and 1 mm. A heat-sensitive stencil master comprising the following fibrous or plate-like substance is provided. In order to obtain the porous layer, first, the fibrous or plate-like substance is contained in the porous layer. Specific examples of these substances will be described later in detail. For example, acicular aluminum borate has a large effect of preventing sagging wrinkles.

Thirdly, in the master for heat-sensitive stencil printing described in the first or second aspect, the porous layer contains a resin having a glass transition point of 60 ° C. or higher or a cross-linked resin. Stencil printing master is provided. Further, in order to obtain the above porous layer, Tg 60
Containing a resin having a temperature of not less than ° C or a crosslinked resin. If the Tg is lower than 60 ° C., the amount of adhesion tends to increase in order to satisfy the above conditions, which is not preferable in terms of image quality, cost, weight, and the like.

Fourthly, in the heat-sensitive stencil printing master described in the first, second or third aspect, the attached amount (after drying) of the porous layer is 1.0 to 15.0 g / m ² . A heat-sensitive stencil master is provided. While deformation ratio decreases as the amount of deposition of the porous layer increases, it decreases the effect of the amount deposited in the porous layer prevents 1.0 g / m ² less than the slack wrinkle, 15.0 g / m ² larger than the ink passing property Worsens.

[0015]

Embodiments of the present invention will be described below. FIG. 1 shows an example in which the biaxially stretched thermoplastic resin film is heated from room temperature around 20 ° C. The horizontal axis indicates time, and the vertical axis indicates temperature, sample length, and generated stress. This figure shows the change in stress when the sample length is kept constant. The measuring device used was “Thermoanalyzer SSC5200 series” manufactured by Seiko Denshi Kogyo KK, and the sample was 2 μm thick.
m, width 4 mm, measurement length about 5 mm.

From the figure, it can be seen that the film starts shrinking at point A (stress generating point), the stress increases sharply, reaches a maximum stress Smax at around 90 ° C., and then gradually decreases. Sm = Smax−A (A is the stress at point A). When the value of Sm differs between the length and width of the film,
The average value in the vertical and horizontal directions is used.

A film in contact with a heating element such as a thermal head also has a maximum temperature at the highest temperature of the heating element and begins to soften. At this time, the shrinkage stress increases in a relatively low temperature part around the part, and the softened part is pulled outward to perform perforation. Even after perforation, the shrinkage stress remains, causing sagging wrinkles.

The porous layer formed by coating according to the present invention is, for example, a porous layer formed by applying a mixed solution containing a resin, a good solvent and a poor solvent described in JP-A-10-24667 to a film and drying the film. Can be used. During the drying process, the resin is precipitated by the relative increase of the poor solvent due to the evaporation of the good solvent and the concentration of the liquid during the drying process, and the resin is dried to form a porous layer consisting of a three-dimensional network structure on the film. Is done. Further, a porous membrane formed by applying a fluid mainly composed of a W / O (water-in-oil) emulsion described in JP-A-11-235885 on a film and drying the film can also be used. In this case, the water in the emulsion evaporates and becomes a hole through which the ink passes, and the resin in the oil in the continuous phase forms a porous layer.

The porous layer suppresses the shrinkage of the film at the time of plate making because, when a force equal to the maximum stress generated in the film at the time of heating is applied to the porous layer, the deformation rate at 60 ° C. is 20%.
% Or less. If it exceeds 20%, many sagging wrinkles occur. The reason why the temperature was set to 60 ° C. was that it was considered that it was optimal to determine the quality of the master at 60 ° C. as a result of measuring the tensile deformation rate of the porous layer at the time of heating.

A first method for obtaining such a porous layer is to use a fibrous or plate-like substance having a diameter of 0.2 to 15 μm in terms of a circle and a length of 3 to 1 mm in diameter. To be included in the layer. If the diameter is smaller than 0.1 μm, dispersion and handling are troublesome, and the price is high. Also 15μ
If it is larger than m, the smoothness of the film surface will be poor. When the length is smaller than three times the diameter, the effect of preventing sagging wrinkles is small, and when the length is larger than 1 mm, dispersion is difficult.

Specific examples thereof include mineral needle fillers such as magnesium silicate, sepiolite, potassium titanate, wollastonite, zonolite, and gypsum fiber, non-oxide needle whiskers, oxide whiskers, and double oxidation. Mineral whiskers and other artificial mineral-based fillers, mica, glass flakes, plate-like fillers such as talc, carbon fibers, polyester fibers, glass fibers, vinylon fibers, nylon fibers, acrylic fibers, and other natural or synthetic fibrous fillers Is mentioned.

These fibrous or plate-like substances are dispersed together with a resin in a non-aqueous solvent. The ratio of the fibrous or plate-like substance in the solid content after drying is 1 to 90%. If it is less than 1%, the effect of preventing sagging wrinkles is small, and if it is more than 90%, it is easy to detach from the porous layer.

In addition, fillers, dispersants, surfactants,
Antistatic agents, preservatives, defoamers, modifiers and the like can be added. Examples of the filler include inorganic pigments such as talc, kaolin, silica, colloidal silica, calcium carbonate, magnesium carbonate, aluminum hydroxide, zinc sulfide, zinc carbonate, zeolite, alumina, and carbon black, polymethyl methacrylate, polystyrene, polyester, and polycarbonate. And powdered organic pigments such as polyethylene, polypropylene, amino resin and styrene-methacrylic acid resin. Dispersion is performed by a known homomixer, Glen mill, ball mill or the like.

The resin constituting the porous layer is desirably a glass transition point (Tg) of 60 ° C. or higher or a crosslinked resin. When Tg is lower than 60 ° C., the amount of adhesion tends to increase to satisfy the conditions, which is not preferable in terms of image quality, cost, weight and the like.

Examples of the above-mentioned resin include polystyrene and its copolymer (hereinafter the same) or derivative (the same hereinafter), polyvinylbenzene, polyvinylpyrrolidone, polyvinylcarbazole, polyallylbenzene, polyvinylalcohol, polyvinylformal, polyvinylacetate, Polyvinyl chloride, polyvinyl acetal, polyvinyl butyral, polyacrylonitrile, polyacrylic acid, polyacrylate, polymethyl methacrylate, polyethyl methacrylate, polypropyl methacrylate, polyisopropyl methacrylate, polytertiary butyl methacrylate, polyethylene terephthalate, polycarbonate, polyamide, ethyl cellulose , Cellulose acetate, silicone resin, etc. alone or as a mixture of two or more There.

For crosslinking of the resin, a mixture of various crosslinking agents and the resin may be applied and crosslinked on the film. Examples of the crosslinking agent include melamine compounds and isocyanate compounds (polyisocyanates such as 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, diphenylmethane-4,4'-diisocyanate, polymethylene polyphenyl polyisocyanate, hexamethylene diisocyanate and These modified products, mixtures, etc.), aldehyde compounds and the like are used to react with the functional groups of the resin to crosslink. A crosslinking accelerator can also be added. In addition, electron beams, ultraviolet rays, and the like can be used as the energy for crosslinking.

The coating on the film is performed by a known coater having a head such as a die, a roll, a blade, a wire bar, and a gravure.

The amount of adhesion after drying is determined by various conditions, but it is necessary that the deformation rate when a force of Sm is applied to the porous layer at 60 ° C. is 20% or less. The deformation rate decreases as the amount of the porous layer attached increases, but is generally 1.0%.
If less than g / m ^{2, the} effect of preventing sagging wrinkles is small,
If it is more than 15.0 g / m ² , the ink will not pass as well and the cost will increase, which is not preferable. The adhesion amount after drying is 1.0 to 15.0 g / m ² , especially 4.0 to 1 g / m ² .
It is preferably 0.0 g / m ² .

As a characteristic of the porous layer, the master of the present invention preferably has a specific air permeability. The “air permeability” is the amount of air passing through the perforated master, and indicates the ink permeability of the master suitable for obtaining excellent various printing characteristics when the master is used for printing. Of course, the properties of the porous layer are relevant. If the air permeability is less than 2.0 cm ³ / cm ² · sec, it is difficult for the ink to pass through the master, and only a printed matter having a low image density can be obtained. If it is larger than 160 cm ³ / cm ² · sec, the ink is excessively discharged and image bleeding or set-off occurs (a phenomenon in which the ink of the immediately preceding print adheres to the back surface of the overlapped printed paper).

In the method disclosed in the above-mentioned JP-A-10-24667, in which a mixed solution containing a resin, a good solvent and a poor solvent is applied to a film and dried to form a porous layer, the larger the ratio of the good solvent is, the more the ventilation increases. The degree increases. Further, in the method of forming a porous layer from an emulsion, the ratio of solvent / water, the type and amount of activator added to the emulsion, dispersion conditions, and the like are significantly related. For example, when the solvent / water ratio of the emulsion is increased, the air permeability tends to decrease, and tends to increase under mild dispersion conditions.

This air permeability is measured as follows.
First, the master film is perforated under specific conditions so that the opening area ratio of the surface is 20% or more and 80% or less. Permeameter for this sample
(Air permeability tester, manufactured by Toyo Seiki Seisaku-sho, Ltd.) is used to measure the air permeability. Specifically, samples having an opening area ratio of 20%, 50%, and 80% for the same sample are prepared.
In order to obtain a desired opening area ratio in the film, it is possible to arbitrarily change the energy applied to the thermal head and / or the size of the heating element of the thermal head. The drilling device is PRIPORT VT 3820
(Ricoh: equipped with a thermal head manufactured by Toshiba Corporation), and plate making is performed using a solid chart of 10 cm × 10 cm while changing the applied energy.

The opening area ratio is a ratio of the total area of the through holes on the film surface of the master to the entire area. This measurement is performed as follows. That is, with an optical microscope,
Take a magnified photo of the drilled master (100 magnification)
Double), then plain paper copier (Ricoh: Imagio 53)
Make an enlarged copy at 0). The opening is marked on the OHP film. Scan the OHP film with a scanner (300
DPI, 256 gradations), and using image retouching software, Adobe Photoshop 2.5J,
Binarize. Then, the area ratio of the opening marked by the image analysis software is measured.

In the above example, for the sake of convenience, the film was measured with the opening area ratio of 20%, 50%, and 80%. However, the air permeability of any sample having an opening area ratio of 20% or more and 80% or less was measured. It is desirable to be 2.0 to 160 cm ³ / cm ² · second. For example, if the opening area ratio is 65% and the air permeability is in the range of 2.0 to 160 cm ³ / cm ² · second, the master perforates the film with an opening area ratio of approximately 65% and provides it for printing. The printing characteristics aimed at by the invention are obtained. The reason why the air permeability is measured when the opening area ratio is 20% or more is that if the air permeability of the porous film is less than 20%, even if the porous film is used for printing, the film prevents the passage of ink. That's why.

As the thermoplastic resin film, a stretched polyester having a thickness of 0.5 to 5 μm is preferably used. If it is smaller than 0.5 μm, it is difficult to handle and transport by a printing machine, and the cost per area increases. 5 μm
If it exceeds, the thermal sensitivity becomes small. In addition, from the standpoint of environmental protection, various biodegradable polymers such as cellulose, protein, natural rubber, microbial polyester, microbial polysaccharide, aliphatic polyester, polyglycolic acid, polylactic acid, cyclic ether polyester, methacrylate resin, poly Ether, polyvinyl alcohol and the like may be used.

As the perforation means, thermal energy of a thermal head and laser is used. In the case of a thermal head, it is desirable that a known stick preventing agent such as a silicone compound, a fluorine compound, a wax, or a fatty acid be processed on the film surface in contact with the thermal head, if necessary, together with an antistatic agent and the like. In the case of a laser, in order for the film to efficiently convert the laser energy into heat, it is desirable that the laser irradiation surface side of the film be processed with a substance having absorption in the wavelength region. Wavelength is 600-120
In the case of a laser of 0 nm, a dye such as a cyanine dye, a phthalocyanine dye, and a styryl dye, carbon black, graphite, metal carbide, iron oxide, titanium black, a magnetic powder, and the like can be used together with a binder such as a resin if necessary. . Particularly, carbon black is effective.

[0036]

Next, the present invention will be described in more detail by way of examples. However, the present invention is not limited by the following examples. In the examples, all parts are parts by weight.

Example 1 Polyvinyl butyral (Tg 73 ° C.) 5.0 parts Methanol 45.0 parts Acicular aluminum borate (diameter: 0.5 to 1.0 μm, length 10 to 30 μm) 2.5 parts Dispersant ( 0.05 parts of water 3.0 parts of the above-mentioned polyvinyl butyral was dissolved in methanol, a dispersing agent and acicular aluminum borate were added, and the mixture was dispersed in a ball mill for 3 hours. Water was further added with stirring to obtain a coating solution. This coating solution was applied to a biaxially stretched polyester film having a thickness of 2 μm using a gravure coater, and dried at 60 ° C. to form a porous layer. The adhesion amount was 6.3 g / m ² . Further, a known silicone-based stick prevention layer was provided on the polyester film opposite to the porous layer to prepare a master.

Example 2 Polyvinyl acetal (Tg 110 ° C.) 2.0 parts Ethyl acetate 30.0 parts Sorbitan monooleate 0.15 part The above was dissolved and dispersed. To this, 0.1 part of 2,4-tolylene diisocyanate was dissolved, and 15.0 parts of water was further added with stirring to obtain an emulsion coating solution. The coating solution was divided and prepared by the amount used up in 30 minutes of coating. Example 1
After drying with a gravure roll on a 2.0 μm-thick biaxially stretched polyester film having the same thickness as described above, the adhesion amount was 7.0 g / m ^2.
And a porous film was formed. Coating speed is 1
The drying temperature was 0 ° C / min and the drying temperature was 60 ° C. Next, a mixture of silicone and a cationic antistatic agent was applied on the surface opposite to the surface where the porous layer of the film was formed.
/ M ² to obtain a master.

Example 3 Potassium titanate whiskers (diameter 0.3 to 0.6 μm, length 10 to 20 μm) 0.5 were added to the liquid before addition of water in Example 2.
Was added and dispersed by a ball mill. Next, as in Example 2, 15.0 parts of water was slowly added while stirring to obtain a cloudy emulsion coating solution. This was applied to the same biaxially stretched polyester film having a thickness of 2.0 μm as in Example 1 using a gravure roll after drying so that the adhesion amount was 7.0 g / m ² to form a porous film. Coating speed is 10m
/ Min, drying temperature was 60 ° C. A mixture of silicone and a cationic antistatic agent was applied to the surface of the film opposite to the surface on which the porous layer was formed so that the adhesion amount after drying was 0.05 g / m ² to obtain a master.

Comparative Example 1 Polyvinyl butyral (Tg: 54 ° C.) 5.0 parts Methanol 45.0 parts Water 3.0 parts A coating solution composed of the above was applied to a biaxially stretched polyester film having a thickness of 2 μm using a gravure roll, and then at 60 ° C. After drying, a porous layer was formed. The adhesion amount was 6.7 g / m ² .

Comparative Example 2 A porous layer was formed in the same manner as in Comparative Example 1, except that the amount of adhesion was 16.0 g / m ² .

Comparative Example 3 A VT master made by Ricoh (a biaxially stretched polyester film having a thickness of 1.5 μm and a hemp / synthetic fiber mixed Japanese paper having a basis weight of 11 g / m ² ) was used as a master of Comparative Example 3. .

With respect to the masters of Examples 1 to 3 and Comparative Examples 1 to 3 obtained as described above, the porous layer deformation rate, slack wrinkle, image density, printing unevenness, and set-off were measured and evaluated by the following measuring apparatus and method. . Table 1 shows the results.

Stress and deformation ratio of the porous layer of the film As a device for measuring the generated stress and deformation, a "thermal analyzer SSC5200 series" manufactured by Seiko Instruments Inc. was used. The heating rate was 4 ° C./min. It was carried out in. The size of the sample is 4 mm in width and 5 mm in measurement length. The porous layer was peeled off from the film, cut into a predetermined size, and used for measurement. The Sm of the film was 2.9 gf / 4 mm from FIG.
(0.73 gf / mm). Since the initial tension was applied to 500 mg, the measurement of the dimensions was started from the position of 12 μm to which the load was applied (FIG. 1).
reference).

For the measurement of sagging wrinkles, a plate-making printing machine manufactured by Ricoh (PRIPO) was used.
RT VT 3820), 20 cm x 2 in standard condition
Plate making was carried out with a solid chart of 0 cm and visually judged.も の indicates little sagging wrinkles, △ indicates slight wrinkles, and × indicates many.

Printing Unevenness, Set-Off, and Image Density Image formation was also performed using PRIPORT VT 3820. Printing unevenness: The printed image is observed with the naked eye, and all of the bleeding, blurring, and density unevenness are caused by the current master (VT-2 manufactured by Ricoh).
） Indicates that the master is superior to the master, △ indicates that the master is equivalent to the current master, and x indicates that the master is inferior to the current master. Set-off: The printed matter is observed with the naked eye, and a mark superior to the current master (VT-2 master manufactured by Ricoh) is indicated by 、, a mark equivalent to the current master is indicated by Δ, and a mark less than the current master is indicated by ×. Image density: Measured with a Macbeth densitometer.

The opening area ratio and air permeability were measured by the above-described apparatus and method.

[0048]

[Table 1] (Note) 1. In the table, x ^* indicates that printing unevenness was caused by sagging wrinkles. 2. The deformation ratio of the porous layer in Comparative Example 3 was measured for hemp / synthetic fiber mixed Japanese paper.

As shown in the above table, in Comparative Example 1, sagging wrinkles occurred. In Comparative Example 2, since the amount of the porous layer attached was large, no sagging wrinkles were generated, but the image was poor.

[0050]

As described above, the first aspect of the present invention relates to a heat-sensitive stencil printing master in which a porous layer is coated on a stretched thermoplastic resin film, and the maximum stress generated in the film when heated. When a force equal to Sm is applied to the porous layer, the porous layer is provided on the film such that the deformation rate of the porous layer is 20% or less at 60 ° C. According to this configuration, excellent image quality and low set-off are achieved. While retaining the characteristics,
A master free of sagging wrinkles during hot plate making can be obtained.

According to a second aspect of the present invention, in order to obtain the porous layer, a fibrous or plate-like material having a diameter of 0.1 to 15 μm in terms of a circle and a length of three times or more and 1 mm or less is used. Substances are contained, and the effect of preventing sagging wrinkles is increased by including these substances in the porous layer.

According to a third aspect of the present invention, in order to further obtain the porous layer, it is preferable to contain a resin having a Tg of 60 ° C. or higher or a crosslinked resin. In order to satisfy the ratio, the amount of adhesion tends to increase, which is not preferable in terms of image quality, cost, weight, and the like.

According to a fourth aspect of the present invention, the amount of the porous layer adhered is
1.0-15.0 g / m (after drying) ^TwoEven if
Therefore, the adhesion amount is 1.0 g / m^TwoWrinkles smaller and sagging
Effect is small, 15.0 g / m^TwoLarger than i
Worsens the link permeability.

[Brief description of the drawings]

FIG. 1 is a diagram showing stress generated when a thermoplastic resin film is heated.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Fumiaki Arai 1-3-6 Nakamagome, Ota-ku, Tokyo Ricoh Co., Ltd. (72) Inventor Tetsuo Tanaka 3- 10-4 Fyodai, Mishima-shi, Shizuoka F-term (Reference) 2H114 AB23 AB24 BA06 DA08 DA25 DA51 DA56 DA62 DA73 DA78 EA01 EA02 EA04 GA11 GA34 GA38

Claims (4)

[Claims] 1. A thermosensitive stencil printing master in which a porous layer is coated on a stretched thermoplastic resin film, wherein the maximum stress generated when the film is heated from room temperature is Sm. A heat-sensitive stencil master having a deformation rate of 20% or less when a force of Sm is applied at 60 ° C. 2. The master for heat-sensitive stencil printing according to claim 1, wherein the diameter of the porous layer when converted into a circle is 0.
A master for heat-sensitive stencil printing, comprising a fibrous or plate-like substance having a length of 1 to 15 [mu] m and a length of 3 to 1 mm in diameter. 3. The heat-sensitive stencil printing master according to claim 1, wherein the porous layer contains a resin having a glass transition point of 60 ° C. or higher or a cross-linked resin. Master for stencil printing. 4. The heat-sensitive stencil printing master according to claim 1, wherein the amount of adhesion (after drying) of the porous layer is:
A heat-sensitive stencil master having a weight of 1.0 to 15.0 g / m ² .