JP2002036693A - Thermal screen plate-making printing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermal screen plate making printing apparatus not generating the perforation deficiency of a master film and capable of obtaining an image of good quality. SOLUTION: The thermal screen plate making printing apparatus has a porous plate cylinder having a master locking means, a plate making means for making a master to wind the same around the plate cylinder, and a means for cutting the formed master. A master wherein a porous resin film is provided on one surface of a film is used as the master.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-sensitive stencil printing machine in which a master capable of heat-sensitive stencil printing is prepared, and the master is wound around a plate cylinder for printing.

[0002]

2. Description of the Related Art Generally, in a stencil printing machine, a master on which a perforated image is formed is wound around an outer peripheral surface of a plate cylinder which is rotationally driven by a driving source, and ink is passed through the perforated portion.
By transferring this ink to printing paper, a printed image is formed. On the outer peripheral surface of the plate cylinder, a master locking means for locking the leading end of the master is provided so as to be openable and closable with respect to the outer peripheral surface of the plate cylinder. By doing so, the platen roller provided on the upstream side in the master transport direction with respect to the master locking means or the leading end of the master transported by the transport roller is locked.

A master used in a conventional stencil printing machine includes a thermoplastic resin film (hereinafter simply referred to as “film”).
), A porous thin paper or the like as an ink-permeable support (hereinafter sometimes simply referred to as a “support”) is bonded with an adhesive, and the film surface is prevented from sticking to a thermal head. There is known a thermosensitive stencil master provided with a stick prevention layer. In fact, a film is attached to a mixture of hemp fiber or hemp fiber and synthetic fiber, wood fiber as porous thin paper with an adhesive,
In addition, a heat-sensitive stencil master having a stick prevention layer provided on a film surface is widely used.

[0004]

However, in such a conventional stencil printing machine using a heat-sensitive stencil master, since a support made of fibers is present immediately above the film, (1) the fibers overlap. A large amount of adhesive accumulates like a bird's web in a portion where the film comes into contact with the portion, and it is difficult for the thermal head to pierce that portion. In addition, the portion hinders the passage of ink and causes printing unevenness, (2) the fiber itself hinders the passage of ink and printing unevenness occurs, and (3) the perforated diameter pierced by the thermal head. Since the thickness of the fibers and the voids are large, there are problems such as poor smoothness of the film surface, poor contact between the heating element of the thermal head and the film, and easy occurrence of perforation failure.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention has been made in view of the above-mentioned circumstances of the prior art, and there is no defective perforation of a film in a master, no printing unevenness with a small amount of ink adhered, and no printed matter. An object of the present invention is to provide a heat-sensitive stencil printing machine having less back stains.

[0006]

The present inventor has studied the heat-sensitive stencil stencil printing apparatus and the heat-sensitive stencil printing master from various angles. As a result, (a) the passage of ink and the perforation by the thermal head are prevented. It is desirable that the support made of only the fibrous substance that hinders be not present directly above the film. (B) If the support does not have the fibrous substance, the master has a low tensile strength and is likely to generate print elongation. (C) The support preferably has relatively small contact points with the film, does not hinder the passage of ink, and provides sufficient stiffness and tensile strength for transport on a printing press. From the research results that the support made of fibrous material should have high tensile strength,
It is desirable that the master for heat-sensitive stencil printing has a film having a porous resin film made of resin on one surface of the film, and a material having a porous fiber film made of fibrous material on the surface of the porous resin film. I confirmed that. The present invention has been made.

[0007] The "porous resin film" referred to here is a porous film formed by, for example, precipitating and coagulating a resin dissolved in a solvent.
A wall-like coating composed of an aggregate of a number of cells with ceilings or an aggregate of cells without a ceiling in FIG. 5, a foamy coating composed of an aggregate of open-celled cells in FIG. 2, a grain shape or a fiber in FIG. Means a film formed by an aggregate-like film formed by sticking resin-like together.

[0008] The term "porous fibrous membrane" means a membrane formed of tissue paper made of fibrous substances such as vegetable fibers such as cotton and hemp, and synthetic fibers such as polyester and polyvinyl alcohol.

In FIGS. 1 to 3 and 5, reference numeral 1 denotes a thermoplastic resin film, 4 denotes a porous resin film, 4a denotes a wall-like film in a component constituting the porous resin film, and 4b denotes a porous resin film. The constituent elements constituting the resin film, and 7 indicates a porous fiber membrane, respectively.

That is, according to the present invention, (1) a rotatable porous plate cylinder having at least a master locking means for locking the leading end of the master on a part of the outer peripheral surface, and Plate making means for plate making the master and transporting the plate made master around the outer peripheral surface of the plate cylinder; means for cutting the master made to a predetermined length; An inking means for supplying printing ink to a plate-made master wound on a surface, a transfer means for transferring printing ink passed through the plate-made master to a printing medium, and peeling a used master from the plate cylinder A stencil printing machine provided with a stencil removal section for removing the stencil sheet, wherein the stencil sheet is characterized in that a master having a porous resin film made of a resin on one surface of a thermoplastic resin film is used as the master. Plate making and printing equipment,

(2) A rotatable porous plate cylinder having at least a master locking means for locking the leading end of the master on a part of the outer peripheral surface, and forming the master according to image information. Plate making means for transporting the master made by plate making so as to be wound on the outer peripheral surface of the plate cylinder; means for cutting the master made by plate making into a predetermined length; and plate making wound on the outer peripheral surface of the plate cylinder Means for supplying printing ink to the finished master, transfer means for transferring printing ink that has passed through the plate-making master to a printing medium, and a plate discharge section for peeling and removing the used master from the plate cylinder. A plate-making printing apparatus comprising: a thermoplastic resin film as one of the masters, having a porous resin film made of a resin on one surface thereof, and further laminating a porous fiber film made of a fibrous substance on the surface thereof. Heat sensitive holes characterized by using a master Plate making printing device, is provided.

In the heat-sensitive stencil printing machine of (1) and (2) of the present invention, it is preferable that (3) the components of the porous resin film of the master are mutually connected, and (4)
It is preferable that at least a part of the porous resin film of the master has a softening temperature of 150 ° C. or less, and (5) a part of the porous resin of the master is in a film form under the influence of the printing ink. (6)
The surface of the porous resin film of the master has a diameter of 5μ when converted to a perfect circle.
m is preferably 4 to 80% of the total surface area, and the surface of the porous resin film of the master has an opening area of a hole having a diameter of 5 μm or more when converted into a perfect circle. Is preferably 50% or more of the total opening area, and (8) the smoothness of the thermoplastic resin film surface of the master is 1%.
Preferably, it is 5000 seconds. These (3) to (8)
May be applied to the above (1) and (2) in combination of two or more.

In the heat-sensitive stencil printing machine according to any one of the above (1) to (8), (9) the surface of the thermoplastic resin film of the master on the thermal head side has a Beck smoothness of 15000 seconds or more. And preferably (1
0) The thermoplastic resin film surface of the master has an opening area ratio of 2
When pierced so as to be 0% or more, it is preferable that the value measured by a gas permeability tester is in the range of 1.0 to 157 cm ³ / cm ² · second, and (11) the bending stiffness of the master is 5 mN or more. It is preferred that These (9) (10)
Items (11) and (11) may be applied in combination.

Further, in the heat-sensitive stencil making and printing apparatus according to the above (2) to (11), (12) when the thermoplastic resin film of the master is pierced by a thermal head, a porous fiber is formed for each hole. The fibrous substance of the membrane is 2
Those that cross seven lines are preferred.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. FIG. 11 shows a typical example of the heat-sensitive stencil printing machine of the present invention. Reference numeral 10 denotes an unmade master that is wound in a roll. The master 10 is composed of a thermoplastic resin film 1 having a thickness of about 1 to 2 μm and a porous resin film 4 made of resin.
Or a laminate in which a porous fiber membrane 7 is further laminated on a porous resin membrane 4.

Around the rotatable plate cylinder 12, a master 1 is provided.
Plate making unit 13 for heating and perforating (plate making) 0 to feed plate cylinder 12
A pair of registration rollers 14 for transporting the printing paper fed from a paper feeding unit (not shown) in time with the progress of the master 10 having made a plate around which the printing paper is wound around the plate cylinder 12;
A press roller 15 that presses the printing paper fed from the registration roller 14 onto the plate cylinder 12 via the master 10 that has already made a plate; a peeling claw 16 that peels the printed printing paper from the plate cylinder 12; A paper discharge unit (not shown) for storing the printing paper peeled off by 16 and a plate discharge unit 17 for peeling and removing the used master 10 on the plate cylinder 12 from the plate cylinder 12 are arranged.

The plate making section 13 includes a platen roller 19, a thermal head 20, a pair of conveying rollers 21 and 22,
And a guide plate 24 for supporting the master 10 from below, and the like.

A supply shaft 2 for supporting a blank master 10
5, platen roller 19, transport rollers 21 and 22, etc.
It is rotatably supported by a side plate (not shown) of a main body case of the plate making printing apparatus and is connected to a common conveyance motor (not shown, but preferably a stepping motor).
In this case, the peripheral speed of the transport rollers 21 and 22 is configured to rotate at a speed slightly higher than the peripheral speed of the platen roller 19 so as to apply tension to the master 10. Further, the pressing force of the thermal head 20 via the master 10 of the platen roller 19 is set low,
N / mm to 0.24 N / mm, preferably 0.06 N / mm
mm to 0.18 N / mm.

The plate cylinder 12 has a non-opening 12a and an opening 1
2b are formed. A mesh screen formed of a resin or metal mesh is provided in the opening 12b. The plate cylinder 12 has flanges (not shown) fixed to both ends thereof rotatably supported by an ink pipe 30 fixedly supported on a side plate of the printing apparatus, and is driven clockwise.

The plate cylinder 12 is provided inside the plate cylinder 12.
An ink roller 31 and a doctor roller 32 that are in contact with the inner peripheral surface of the ink roller 30 are rotatably provided with a slight gap therebetween, and a wedge-shaped space between the ink roller 31 and the doctor roller 32 is provided. An ink reservoir 34 for receiving ink dropped from a supply hole 33 formed at the lower end is formed. Ink is supplied to the ink pipe 30 from an ink pack (not shown) provided outside the plate cylinder 12.

The non-opening portion 1 is provided on the outer peripheral surface of the plate cylinder 12.
A stage 35 and a clamper 36 for holding the leading end of the master 10 having been made in the plate 2a are attached. The stage 35 is formed of a magnetic material and has a length along the axial direction of the plate cylinder 12. The clamper 36 is rotatably supported on a clamper shaft 37 disposed along the longitudinal direction of the stage 35 as a support shaft. The clamper shaft 37 is driven in a rotating direction by a driving unit (not shown).

The press roller 15 is rotatably supported by an end of a roller support member 39 which rotates integrally with the arm shaft 38. In the present embodiment, the roller support member 39
Is configured to rotate integrally with a pressure arm (not shown) driven in synchronization with the rotational movement of the plate cylinder 12.

The plate discharging section 17 has a plate discharging box 40 and a pair of plate discharging rollers 41 and 42. These plate discharge rollers 41 and 42 are driven by a contact / separation drive unit driven by a plate discharge command signal to approach the plate cylinder 12, and are driven and rotated by a motor (not shown). The rotation direction of one plate discharging roller 41 is set in a counterclockwise direction, and the rotation direction of the other plate discharging roller 42 is set in a clockwise direction.

The operation of the plate-making printing apparatus will be described below.

When the plate making command signal is output, the plate cylinder 2 rotates and stops until the clamper 36 reaches a fixed position below the plate discharging section 17 by using the signal as a trigger, and the clamper 36 is opened. With the release operation of the clamper 36, the plate discharge rollers 41, 42 of the plate discharge unit 17 come into contact with the used master on the plate cylinder 12 and subsequently rotate, so that the used master used last time is discharged by the plate discharge rollers 41, 42. The sheet is nipped and separated from the plate cylinder 12 and discarded in the plate discharge box 40.

Thereafter, as shown in FIG. 11, the plate cylinder 12 rotates and stops until the clamper 36 is located substantially directly above, and the clamper 36 is maintained in the open state and waits for plate feeding. Ten plate making operations are performed. That is, although not shown, the original is sent to the original reading unit by the original separating and conveying device, and the original image is read. The image signal is CCD
And the like, and further converted into a digital signal by an A / D converter, controlled by a plate-making control unit and output to a thermal head 20, and a rotation operation of a platen roller 19 and transport rollers 21 and 22. Is controlled. As a result, data is formed on the master 10 in a perforated state.

When it is determined that the leading end of the stencil master 10a has reached the clamper 36 based on the number of drive steps of the transport motor that drives the platen roller 19 and the transport rollers 21 and 22, the clamper 36 closes. , The plate cylinder 12 rotates at substantially the same peripheral speed as the peripheral speed of the platen roller 19 at the same time as holding the leading end of the plate-made master 10a.
2 is wound around. When the number of drive steps of the stepping motor for driving the plate cylinder 12 at this time reaches a predetermined value, the cutter 23 is driven and the master 10a for
Is cut to a desired length to cover the opening 12b of the plate cylinder 12, and the rear end of the cut master 10a, which has been cut by the rotation of the plate cylinder 12, is pulled out and wound around the plate cylinder 12. Complete.

When the master 10a, which has been made, is wound around the plate cylinder 12, printing paper stacked on a paper feed tray (not shown) is fed by a separate paper feeding device, and the printing paper is rotated by the plate cylinder 12. When the sheet is conveyed between the plate cylinder 12 and the press roller 15 by the registration roller 14 which rotates in synchronization with the movement, the roller support member 39 rotates integrally with the pressure arm to move the press roller 15 on the plate cylinder 12. Press on the printing paper. Thereby, printing is performed.

The printing paper on which printing has been performed is separated from the separation claw 16.
As a result, the sheet is peeled off from the plate cylinder 12 and is discharged to a discharge tray (not shown).

Next, the master 10 used in the stencil printing machine of the present invention will be described.

A master 10 for thermosensitive stencil printing provided with a support having the porous resin film and the porous fiber film of the present invention.
Is schematically shown in FIG. 6, for example. In FIG.
Reference numeral 4 denotes a porous resin film, 3 denotes a porous resin film opening, 1 denotes a thermoplastic resin film, and 7 denotes a porous fiber film.

As described above, the “porous resin film” in the present invention is a film formed by forming an aggregate of a large number of cells with a ceiling or an aggregate of cells without a ceiling when the film is compared with a floor on the film. It is.

The cell may be in a closed state or a part thereof may be open. Opening can be achieved by breaking the foam film during the drying process. The broken line in FIG. 1 and the inside of the donut shape in FIG. 4 indicate an opening. FIG. 5 shows a state in which all openings are made. The angle formed between the film 1 and the wall coating 4a constituting the porous resin film 4 near the thermoplastic resin film 1, that is, the rising angle θ of the wall coating 4a from the film 1 may be 20 degrees or more. Desirably, it is more desirably 30 degrees or more, and the upper limit is 90 degrees. These porous resin films 4 are composed of an aggregate of the cells.

In FIG. 1, FIG. 2, FIG. 3, and FIG. 5, the constituent elements 4b constituting the porous resin film 4 are connected to each other.

If the average pore size of the porous resin film 4 is too small or too large, good print quality cannot be obtained. For this reason,
The average pore size is generally 1 μm or more and 50 μm or less, preferably 2 μm or more and 30 μm or less.

When the average pore diameter is less than 1 μm, the ink permeability is poor, and if a low-viscosity ink is used to obtain a sufficient amount of ink to pass through, the image is blurred or the side portion of the printing drum or the winding during printing. A phenomenon occurs in which the printing ink seeps out of the rear end of the mounted master. In addition, the porosity in the porous resin film is often low, and it is easy to hinder perforation by the thermal head.

If the average pore size exceeds 50 μm, the effect of suppressing the ink by the porous resin film is reduced, and the ink between the printing drum and the film is excessively extruded during printing, causing problems such as back stains and bleeding. I do.

The porous resin film 4 only needs to have a structure having a large number of voids inside and on the surface of the film, and the voids extend in the thickness direction in the porous resin film from the viewpoint of ink permeability. It is desirable that the film has a continuous structure and penetrates in the ceiling direction when the film is used as a floor. However, at the boundary between the porous resin film and the film, the porous resin film 4 may cover and close the film 1 as long as the perforation by the thermal head is not hindered.

The thickness of the resin constituting the porous resin film 4 which covers the film 1 and does not reduce the perforation by the thermal head depends on the kind of the resin constituting the film, the thermal sensitivity of the film, and the like. The combined thickness is 7 μm or less.

On the surface of the porous resin film, the total opening area of the holes having a diameter of 5 μm or more in terms of a perfect circle is 4% of the total surface area.
~ 80%, desirably 10-60%. The ratio is 4
%, The probability of perforation by the thermal head and the passage of ink tend to be hindered. On the other hand, if the ratio exceeds 80%, the passage of the ink becomes excessive, and a high quality printed matter cannot be obtained.

The porous resin film 4 has a completely different structure from the porous portion of the conventional stencil printing master. The individual part forming the structure is composed of an aggregated joint of irregular rods, spheres, and branches, and the structure is determined by the manufacturing conditions of the porous resin film, for example, the type of the resin, the solids of the liquid. The concentration varies depending on the concentration, the type of solvent, the amount of applied resin liquid, the drying temperature of the resin liquid, the temperature of the coating atmosphere, the humidity and the like.

Similarly, on the surface of the porous resin film, the total opening area of the holes having a diameter of 5 μm or more when converted to a perfect circle is 50% or more, preferably 70% or more of the total opening area. If the ratio is less than 50%, perforation and passage of ink by the thermal head are likely to be hindered.

The thickness of the porous resin film 4 as a support is
5 μm or more, 100 μm or less, preferably 6 μm or more,
It is 50 μm or less. The amount of ink transferred to the paper during printing can be adjusted by the thickness of the porous resin film. If the thickness after coating is larger than the target, the thickness can be reduced to the target thickness by means such as pressure bonding using a calender. The thickness is measured with substantially no load or with a very small load.

If the thickness of the porous resin film is less than 5 μm, it is difficult to obtain sufficient film strength, and it is difficult for the porous resin film to remain behind the perforated portion after perforation by the thermal head, and the amount of ink transferred is small. Without control, the back stain on the printed matter tends to deteriorate. Further, when the thickness of the porous resin film exceeds 100 μm, the passage of ink is hindered, which causes image unevenness.

The adhesion amount of the porous resin membrane as a support is as follows:
0.5 to 25 g / m ² , preferably ^{2 to} 15 g / m ² , more preferably ² to 7 g / m ² . Adhesion amount of increase will degrade the image quality prevent passage of ink, difficult to obtain a sufficient film strength is less than 0.5 g / m ^2, conversely, it prevents the passage of ink exceeds 25 g / m ² quality Make you worse.

The density of the porous resin film 4 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 0.5 g / cm ³ or less. Density is 0.
If it is less than 01 g / cm ³ , the strength of the film is insufficient, and the film itself is easily broken. Conversely, if the density exceeds 1 g / cm ³ , the passage of the ink is hindered and the image quality deteriorates.

The stiffness of the master for heat-sensitive stencil printing of the present invention is as follows:
It is desirable that the bending stiffness be 5 mN or more (by Lorentzen Stiffness tester). Flexural rigidity is 5mN
If it is less than 100 mm, it may be difficult to convey the heat-sensitive stencil printing master on a printing press.

In the present invention, when the thermoplastic resin film surface of the master for heat-sensitive stencil printing is perforated so as to have an opening area ratio of 20% or more, the value measured by a gas permeability tester is 1.0 cm ³ / cm ^2. -The range is from seconds to 157 cm ³ / cm ² · second. Here, the opening area ratio is the total area of the through-holes on the film surface of the heat-sensitive stencil master when the heat-sensitive stencil master is subjected to solid plate making by a thermal head, a laser, a flash lamp, or the like. , The ratio of the solid portion per unit area.

When the opening area ratio is less than 20%, it is necessary to use an ink having a very low viscosity in order to secure an image density. When such an ink is used, a solid printing in a stencil printing system is required. The uniformity of the part or the reproducibility of the fine line is not good.

In this case, the air permeability is 1.0 cm ³ / cm ^2.
If it is less than a second, the ink permeability is poor, and if a low-viscosity ink is used in order to obtain a sufficient amount of ink passing, the image will bleed and the side of the print drum or after the master that is wound around during printing. The phenomenon that the printing ink seeps out from the edge occurs.
In addition, the porosity in the porous resin film and the porous fiber film is often low, and it is easy to hinder perforation by the thermal head.

When the air permeability exceeds 157 cm ³ / cm ² · sec, the effect of suppressing the ink by the porous resin film and the porous fiber film becomes low, and the ink between the printing drum and the film becomes excessive during printing. Extrusion results in defects such as back stains and bleeding, and good print quality cannot be obtained if the air permeability is too small or too large.

The porous resin film should be softened at a temperature of 150 ° C. or less in at least a part of the porous resin film, that is, a part of the porous resin film that comes into contact with the film, in order to more effectively perforate the film with the thermal head. Is desirable. In order to adjust the pore size, shape, strength, and stiffness of the membrane, it is preferable that the porous resin membrane contains a pigment.

Printing is performed by passing ink through the perforated portion of the film by the thermal head. However, ink cannot pass through when the cell is closed. However, the heat-sensitive stencil printing ink is generally a W / O-based emulsion, and this problem can be solved by the fact that a part of the porous resin film is substantially destroyed by these components and no longer forms a film. Preferably, the cell is not closed.

It is preferable that the heat-sensitive stencil printing master used in the present invention is one in which at least a part of the porous resin film remains behind the perforated portion after perforation by the thermal head. Since the porous resin film remains behind the perforated portion after perforation, the amount of transferred ink is controlled, and the back stain on the printed matter is suppressed. Accordingly, a schematic cross section of the master for heat-sensitive stencil printing of the present invention after perforation by the thermal head is shown, for example, in FIG. In FIG. 7, reference numeral 1 denotes a thermoplastic resin film, 4 denotes a porous resin film, 5 denotes a heat-perforated portion of the thermoplastic resin film, and 7 denotes a porous fiber membrane.

The plastics which are the main components of the porous resin film material include polyethylene, polypropylene, polybutene, styrene resin, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyvinyl acetate, polyvinyl butyral, polyvinyl acetal, and the like. Vinyl resin such as vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinylidene chloride copolymer, vinyl chloride-acrylonitrile copolymer, styrene-acrylonitrile copolymer, etc., polyacrylonitrile, polyacrylic plastic, diene plastic, polybutylene, nylon, etc. Polyamide, polyester, polyphenylene oxide, (meth) acrylate, polycarbonate, polyacetal, fluorine resin, polyurethane plastic And various natural plastics, natural rubber-based plastics, various thermoplastic elastomers, cellulose derivatives such as acetylcellulose, acetylbutylcellulose and acetylpropylcellulose, microbial plastics, and copolymers containing these polymers. In addition, various fatty acids, various carbohydrates such as wax, and various proteins can also be used.

In the first method for forming a porous resin film according to the present invention, a resin solution is applied on a film, the atmosphere on the coating solution is cooled by latent heat of evaporation when the solvent is volatilized, and the condensed poor solvent is applied. This is due to being taken into a liquid to form a porous resin film. That is, first, a resin solution is applied on a film and dried. At this time, the coating liquid is cooled by the heat of evaporation when the solvent volatilizes, whereby the atmosphere on the coating liquid is cooled. Due to the cooling, the poor solvent in the atmosphere condenses and is taken into the coating liquid. as a result,
The poor solvent taken into the resin solution causes the resin to precipitate, whereby a porous resin film is formed.

In the second method of forming a porous resin film according to the present invention, a resin dissolved in a mixed solution of two or more solvents is applied onto a thermoplastic resin film, and the resin concentration is reduced during drying. Is increased to precipitate a resin, thereby forming a porous resin film. In this case, the mixed solvent is usually preferably a mixed solution of a good solvent and a poor solvent for the resin.

Tables 1 and 2 show good solvents, poor solvents, and their boiling points for typical resins. In the table, ○ indicates a good solvent and X indicates a poor solvent.

[0059]

[Table 1]

[0060]

[Table 2]

Each resin may be used as a mixture of two or more kinds. A good solvent and a poor solvent may be used in combination of two or more.

A filler may be added to the resin solution as needed. This addition affects the shape, strength, and pore size of the porous resin film formed during the drying process. Specifically, zinc oxide, titanium dioxide, calcium carbonate, inorganic compounds such as silica, polyvinyl acetate,
Organic polymer particles such as polyvinyl chloride and polymethyl acrylate. Matsumoto Yushi Pharmaceutical Microcapsules,
Matsumoto Microsphere can also be used effectively.

Further, an antistatic agent, an antistick agent, a surfactant, a preservative, an antifoaming agent and the like can be used in combination with the porous resin film within a range not to impair the effects of the present invention.
The formulation, application conditions, drying method, etc. of the resin solution to be applied are determined by several experiments. For coating, various types of coaters such as a blade, a transfer roll, a wire bar, a reverse roll, a gravure, and a die are used.

As the thermoplastic resin film used in the present invention, there can be used those conventionally used as masters for thermosensitive stencil printing, such as vinyl chloride-vinylidene chloride copolymer film, polypropylene film and polyester film. The thickness of this film is 0.5-10μ
m, more preferably 1.0 to 7.0 μm. 0.5
If it is less than μm, it is too thin to apply the resin liquid,
If it exceeds μm, it becomes difficult to perforate with a thermal head.

In the heat-sensitive stencil printing master used in the present invention, a stick preventing layer for preventing sticking with a thermal head can be provided on the surface of the film. In this case, as the stick preventing agent to be used, those generally used in conventional heat-sensitive stencil printing masters can be used. For example, a silicone release agent, a fluorine release agent, a phosphate ester surfactant and the like can be exemplified.

In the heat-sensitive stencil master used in the stencil printing machine of the present invention, after the porous resin film 4 is formed on the film surface as described above, the surface of the porous resin film 4 Is laminated with a porous fiber membrane 7 formed of a fibrous material manufactured by a known method.

The adhesive used for laminating the porous resin film and the porous fiber film is such that if the viscosity of the adhesive is low, the adhesive enters the inside of the opening 3 of the porous resin film, and the ink permeability is low. It is preferable that the viscosity of the adhesive is so high that it does not flow into the opening of the porous resin film.

Further, a high-viscosity adhesive is applied to the surface of the porous fiber membrane with a roller and laminated on the surface of the porous fiber membrane. Alternatively, a high-viscosity adhesive may be applied to the surface of the porous fiber membrane with a roller, and the adhesive may be dried before being laminated on the surface of the porous resin membrane. Alternatively, the resin liquid may be applied to the film surface, and before the resin film dries, the porous fiber film may be laminated on the resin liquid surface, dried, and the porous fiber film may be laminated on the porous resin film.

In this embodiment, a porous fiber film made of fibers is laminated on a porous resin film made of resin, but the porous fiber film may not be used. However, the cost of the master can be reduced due to the absence of stacking,
Since the tensile strength is weakly reduced, elongation is likely to occur when printing a large number of sheets.

Examples of the porous fiber membrane 7 include mineral fibers such as glass, sepiolite and various metals; animal fibers such as wool and silk; plant fibers such as cotton and hemp; and regenerated fibers such as soup and rayon: polyester and polyvinyl alcohol. And synthetic fibers such as acrylic; semi-synthetic fibers such as carbon fiber; and thin paper such as inorganic fibers having a whisker structure.

In this case, the thickness of the fibrous substance is the diameter of the perforation,
It is necessary to select an appropriate one according to the thickness of the film and the like, but the diameter is 20 μm or less, preferably 1 to 10 μm. If the diameter is smaller than 1 μm, the tensile strength is weak and 2
If it is larger than 0 μm, the passage of ink is hindered, and so-called white spots due to fibers appear in the image. The diameter of the fibrous substance may be converted into a circular diameter from denier and specific gravity.

The length of the fibrous substance is 0.1 to 2 mm.
If it is longer than this, it becomes difficult to perform uniform dispersion.

In the heat-sensitive stencil master 10, the relationship between the film and the fibrous material is such that when a film is perforated with a thermal head, two to seven fibrous materials cross each hole. Is more preferable. If the number of fibrous substances crossing the perforated portion is less than two, the effect of hindering the passage of ink is small and the effect of preventing set-off is small. Trouble occurs.

The ratio of the number of perforations crossed by 2 to 7 fibrous substances is desirably 80% or more of the perforated portion. Judgment is made based on 100 perforations randomly selected from a micrograph. If even a part of the fibrous substance is perforated, it is determined to be one.

Therefore, this porous fiber membrane has a dry adhesion amount of 3
１２12 g / m ² , preferably about 4-7 g / m ² . Further, the thickness of the porous fiber membrane is related to the thickness of the fibrous substance, and is 50 μm or less, preferably 10 to 24 μm.
μm.

In the present invention, since the porous fiber film made of fibers having high tensile strength is laminated on the upper surface of the porous resin film having relatively low tensile strength, it is possible to prevent elongation of the master during printing. Further, since the porous resin film exists between the film and the support made of the porous fiber film, the fibers overlap and the adhesive is accumulated, so that the thermal head does not hinder the perforation. Further, since the ink is uniformly dispersed in the porous resin film, printing unevenness due to the overlapping of fibers does not occur.

The porous resin membrane 4 is made of a conventional porous fiber membrane 7
As compared with, the trunk composed thereof can be formed thin and a dense film having small voids can be formed. This makes it possible to significantly improve the smoothness of the master film surface when laminated on the film.

As described above, when plate making is performed using a conventional master in which only a porous fiber membrane is laminated as a film, perforation failure occurs at a contact portion between the fiber and the film, as described above. Further, the contact property between the film and the heating element of the thermal head is poor, and there is a problem that a poor perforation occurs at a place where the contact is poor.

In order to solve this, in the conventional plate making,
(1) To increase the pressing force of the platen roller,
(2) Increase the energy applied to the thermal head, and (3) Slow down the plate making bead.

However, in (1), the driving energy of the platen roller must be increased, and the power consumption increases. Furthermore, it is necessary to increase the rigidity of the stencil printing machine, which increases the cost of the machine. In the case (2), not only the power consumption is increased, but also the life of the thermal head is shortened. Further, in (3), there is a problem that the plate making time becomes longer and the first print time (the time from when the plate making start button is pressed until the first printed matter comes out) becomes longer.

On the other hand, when plate making is performed using a master in which the porous resin film according to the present invention is laminated, the smoothness is good, and the contact between the thermal head and the film is good. Can be solved.

The smoothness of the film surface is preferably 15,000 seconds or more and less than 35,000 seconds. If the time is shorter than 15000 seconds, the adhesion to the thermal head is poor, and poor drilling occurs. On the other hand, at 35000 seconds or more,
Good adhesion between the film and the thermal head makes sticking more likely.

[0083]

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

Examples 1 to 5 A biaxially stretched polyester having a thickness of 2 μm was used as a film. The liquid having the formulation shown in Table 3 was foamed using a homomixer, and the foam was applied on the film using an air knife coater and dried at 50 ° C to 60 ° C (Examples 1 to 4). In Example 5, foaming foam was applied and dried without using a homomixer. The adhesion amount after drying is 2 to 7 g /
m ² . In Table 3, numerical values indicate the number of copies.

In Examples 1 to 5, 1 part of vinyl chloride / vinyl acetate copolymer (VYHH, manufactured by Union Carbide) and 2 parts of polyester fiber (0.15 denier, manufactured by Teijin Limited, with a specific gravity of 1.4) A mixture consisting of 8 parts of ethyl acetate was well dispersed in a ball mill to a thickness of 1.5 μm.
A porous fiber membrane 7 was prepared by coating the polyester film of μm with a roll coater to a dry adhesion amount of 3.5 g / m ² . The drying temperature was 50 ° C. The obtained porous fiber membrane 7 was peeled off from the polyester film, a polyethylene-based adhesive was applied to the porous fiber membrane 7 at 3 g / m ² , and the surface was laminated on the porous resin membrane 4.

Further, a mixture of a silicone resin and a cationic antistatic agent was dried on the opposite surface of the film to prevent sticking of the hot-melted film to the thermal head and for the purpose of preventing static electricity. Coating was performed so that the adhesion amount was about 0.05 g / m ² to prepare a master used in the plate-making printing apparatus of the present invention.

The strength of stiffness was measured with a Lorentzen Stiffness tester. The transportability and image (printing unevenness) were measured by Ricoh stencil printing machine Preport VT-173.
0 and the ink. Table 4 summarizes the evaluation results.

[0088]

[Table 3]

Comparative Example 1 The film was stretched 1.5 times or more in both the vertical and horizontal directions and had a thickness of 20 μm.
m or less of a thermoplastic resin film (JP-A-54-3311).
Example 1 using stretched polyethylene, polypropylene, polyvinyl chloride, vinyl chloride-vinylidene chloride copolymer, polystyrene, polyester, nylon, etc. disclosed in Japanese Patent Publication No.
The plate-making printing was performed in the same manner as described above.

Comparative Example 2 A mixture of natural hemp (abaka) fibers and synthetic fibers was used as a support, and a stretched thermoplastic resin film having a thickness of 0.5 to 5 μm was attached to the support to form a master for thermosensitive stencil printing. And subjected to plate-making printing in the same manner as in Example 1.

Comparative Example 3 Only a porous resin film was formed on a polyester film in the same manner as in Example 1 to obtain a master for heat-sensitive stencil printing.

Table 4 summarizes the evaluation results of the heat-sensitive stencil masters of these Examples and Comparative Examples.

[0093]

[Table 4] * Here, "good" in image quality (uneven printing) means that there is no fiber grain visually. Further, "good" in print elongation means that the master elongation is almost nil.

Example 6 Cellulose acetate butyrate (softening point: 131 ° C.) 5 parts (CAB381-20 manufactured by Eastman Kodak Co.) 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 The solution having the above composition was stirred and dissolved.
A wire bar (0.6 mm) was placed on a 3.5 μm-thick biaxially stretched polyester film in an atmosphere of 0 ° C. and 50% RH.
Diameter). This was left as it was for 1 minute, and then left in a 50 ° C. drying box for 2 minutes to dry, whereby a porous resin film 4 was formed on the film 1. The surface state of the porous resin film 4 is schematically shown in FIG. A mixture of a silicone resin and a cationic antistatic agent for preventing the hot-melted film from sticking to the thermal head on the surface of the film 1 opposite to the surface where the porous resin film 4 is formed, and for the purpose of preventing static electricity. Is applied so that the adhesion amount after drying is about 0.05 g / m ² , and a porous fiber membrane 7 is formed in the same manner as in Example 1, and the resultant is laminated on the porous resin membrane 4. A heat-sensitive stencil master used in the plate-making printing apparatus of the present invention was obtained.

Example 7 Cellulose acetate butyrate (softening point: 131 ° C.) 5 parts Methyl ethyl ketone (boiling point: 79.6 ° C.) 60 parts Water (boiling point: 100.0 ° C.) 30 parts Methyl alcohol (boiling point: 64.5 ° C.) 5 parts A porous resin film and a porous fiber film were formed under the same conditions as in Example 6 to obtain a heat-sensitive stencil master used in the plate-making printing apparatus of the present invention.

Example 8 Cellulose acetate butyrate (softening point 131 ° C.) 5 parts 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 Stir and dissolve the liquid of the composition, leave it still and defoam sufficiently,
A wire bar (0.6 mm) was placed on a 3.5 μm-thick biaxially stretched polyester film in an atmosphere of 30 ° C. and 50% RH.
Diameter) and humidifier (HITACHI)
Humidifier UV-107D) to 10c
The particles of water were contacted for 15 seconds at a distance of m. This was left for 1 minute, and then left for 2 minutes in a drying box at 50 ° C. to dry, thereby forming a porous resin film on the film. Further, a porous fiber membrane was prepared in the same manner as in Example 1. Was laminated on a porous resin film. A mixture of a silicone resin and a cationic antistatic agent was applied to the surface of the film opposite to the surface where the porous resin film was formed in the same manner as in Example 6, to obtain a master for heat-sensitive stencil printing used in the plate-making printing apparatus of the present invention. Was.

Comparative Example 4 Cellulose acetate butyrate (softening point: 131 ° C.) 15 parts Methyl ethyl ketone (boiling point: 79.6 ° C.) 85 parts A solution having the above composition was stirred and dissolved.
A wire bar (0.15 mm) was placed on a 3.5 μm thick biaxially oriented polyester film in a 0 ° C., 60% RH atmosphere.
Diameter). This was left as it was for 1 minute, and then left in a drying box at 50 ° C. for 2 minutes to dry, thereby forming a porous resin film on the film. Further, a porous fiber membrane was prepared in the same manner as in Example 1. It was laminated on a porous resin film. In the same manner as in Example 6, a mixture of a silicone resin and a cationic antistatic agent was applied to the surface of the film opposite to the surface on which the porous resin film was formed, to obtain a master for heat-sensitive stencil printing of a comparative example.

Example 9 Vinyl chloride vinyl acetate copolymer (softening point: 78 ° C.) 3 parts (VYHH manufactured by Union Carbide) Acetone (boiling point: 56.1 ° C.) 20 parts Ethyl alcohol (boiling point: 78.3 ° C.) 8 parts Stir and dissolve the solution, let it stand and thoroughly defoam,
A wire bar (1.0 m) was placed on a 3.5 μm thick biaxially stretched polyester film in a 20 ° C., 50% RH atmosphere.
m diameter). This was left to dry in a 50 ° C. drying box for 2 minutes to form a porous resin film on the film. The surface state of the porous resin film 4 is schematically shown in FIG. Further, a porous fiber membrane was prepared in the same manner as in Example 1, and was laminated on a porous resin membrane. A mixture of a silicone resin and a cationic antistatic agent was applied to the surface of the film opposite to the surface on which the porous resin film was formed, in the same manner as in Example 6, to form a master for heat-sensitive stencil printing used in the plate-making printing apparatus of the present invention. Obtained.

Example 10 A porous resin film and a porous resin film were obtained under the same conditions as in Example 9 except that a 1.5 μm-thick biaxially stretched polyester film was used instead of the 3.5 μm-thick biaxially stretched polyester film. A heat-sensitive stencil master for use in a plate-making printing apparatus of the present invention was obtained by forming a conductive fiber membrane.

Example 11 Vinyl chloride vinyl acetate copolymer (softening point: 83 ° C.) 3 parts (VAGD manufactured by Union Carbide) Methyl ethyl ketone (boiling point: 79.6 ° C.) 17 parts Methyl alcohol (boiling point: 64.5 ° C.) 9 parts A porous resin film and a porous fiber film were formed under the same conditions as in Example 9, and a master for heat-sensitive stencil printing used in the plate-making printing apparatus of the present invention was obtained.

Example 12 Cellulose acetate butyrate (softening point 131 ° C.) 3 parts Acetone (boiling point 56.1 ° C.) 20 parts Water (boiling point 100.0 ° C.) 5 parts Silica powder 0.3 part Same as Example 9 above A porous resin film and a porous fiber film were formed under the conditions, and a master for heat-sensitive stencil printing used in the plate-making printing apparatus of the present invention was obtained.

Comparative Example 5 Styrene acrylate copolymer (softening point 47 ° C.) 16 parts (O / W emulsion resin component 43%) (J840 manufactured by Johnson Polymer Co.) Water (boiling point 100.0 ° C.) 33 parts Silica powder 3 parts After uniformly dispersing the liquid having the above composition disclosed in Japanese Unexamined Patent Publication No. Hei 4-7198, a porous resin film and a porous fiber film were formed under the same conditions as in Example 9 above, and the heat-sensitive stencil printing of Comparative Example was performed. Got a master for

Example 13 8 parts of polyvinyl butyral (softening point 87 ° C.) 8 parts (PVB3000-2 manufactured by Denki Kagaku Kogyo Co., Ltd.) ethyl alcohol (boiling point 78.3 ° C.) 69 parts water (boiling point 100.0 ° C.) 23 parts styrene acrylate 1.2 parts of copolymer (softening point: 65 ° C.) (J679 manufactured by Johnson Polymer Co.) After stirring and dissolving the liquid having the above composition, titanium oxide (rutile)
1.6 parts are added and this is dispersed in a ball mill for 1 hour. After dispersion, a porous resin film and a porous fiber film were formed under the same conditions as in Example 9 to obtain a master for heat-sensitive stencil printing used in the plate-making printing apparatus of the present invention.

COMPARATIVE EXAMPLE 6 One side of the 3.5 μm thick biaxially stretched polyester film used in Examples 6 to 9, 11, 12 and Comparative Examples 4 and 5 was coated with a silicone resin and a cationically charged material in the same manner as in Example 6. The mixture of the inhibitors was applied to a coating weight of about 0.05 g / m ² after drying.
To obtain a thermosensitive stencil master.

Comparative Example 7 A mixture of a silicone resin and a cationic antistatic agent was applied to one surface of a biaxially stretched polyester film having a thickness of 7.0 μm in the same manner as in Example 6, and the adhesion amount after drying was about 0.05 g / m ^2.
To obtain a thermosensitive stencil master.

Example 14 In the same manner as in Example 7, only a porous resin film was formed, and a master for thermosensitive stencil printing was obtained.

Comparative Example 8 Instead of the porous fiber membrane of Example 7, a master (VT) designated by a stencil printing machine Preport VT3820 (manufactured by Ricoh Co., Ltd.) was used.
II master).

<Evaluation> For the heat-sensitive stencil master thus obtained, the softening point of the resin, the average pore diameter of the porous resin film, the area ratio 1 and 2, the strength of the stiffness were measured by the following methods. The perforation sensitivity, image quality, and back stains were measured using a stencil printing machine, Report VT3820 manufactured by Ricoh Co., Ltd., and its ink (VT6).
00 II, lot no. 960604-22) and evaluated according to the following criteria. Prepress printing is 20 ° C,
The printing was performed at a printing speed of 3 speeds in a 60% RH environment with the applied pulse width set longer than the 7% standard condition. However, Example 10
The evaluation was performed only when the applied pulse width was set to the standard state. Table 5 shows the results.

(A) Softening point of resin Measured by using a thermal stress / strain measuring apparatus TMA / SS150C (manufactured by Seiko Instruments Inc.).

(B) The pores of an electron microscope surface photograph taken at an average pore diameter of 1,000 times of the porous resin film were marked with tracing paper to obtain LA-555.
Image processing was performed using D [manufactured by Pierce Co., Ltd.], and each hole diameter was converted to a perfect circle, and the average value was obtained.

(C) Area ratio 1 Area ratio 1 is 5 μm in diameter when each hole diameter is converted into a perfect circle.
The ratio of the total opening area of the above holes to the total surface area of the porous resin film. The holes in the surface photograph of the electron microscope taken at a magnification of 1000 times are marked using tracing paper, and LA-555D [(stock) ) Manufactured by Pierce Co., Ltd.), and each hole diameter was determined by converting it to a perfect circle.

(D) Area ratio 2 Area ratio 2 is the ratio of the total opening area of holes having a diameter of 5 μm or more as a perfect circle to the total opening area of the porous resin film, and was taken at a magnification of 1000 times. The hole of the electron microscope surface photograph was marked using tracing paper, and LA-5
Image processing was performed using 55D (manufactured by Pierce Co., Ltd.), and each hole diameter was determined by converting it to a perfect circle.

(E) Strength of stiffness Measured with a Lorentzen Stiffness tester.

(F) Strength: When the porous resin film and the porous fiber film were not peeled off when the film was run with the thermal head, it was indicated by ◎, and when the film was slightly peeled off, it was indicated by ○.

(G) Perforation sensitivity: A film where the film portion of the master is perfectly perforated by the thermal head is indicated by ◎; a film which is perforated but has a partially reduced perforation diameter is ○; a film which is not partially perforated. Δ, those that were hardly perforated were indicated by x.

(H) Image quality The printed image is observed with the naked eye, and る も の indicates that the bleeding, blurring, and density unevenness are superior to the current master [Ricoh VT II Master Co., Ltd.], and を indicates that the current master is equivalent to the current master. Those that are inferior to the current master are indicated by x.

(I) Back dirt The printed matter is observed with the naked eye, and the current master [Ricoh VT Co., Ltd.
II master], ○ indicates the same as the current master, and X indicates the poorer than the current master.

(D) Image Density The image density of the printed matter was measured with an RD914 densitometer manufactured by Macbeth, and the measured value was shown.

(L) Print elongation After printing 1,000 sheets, no master elongation was indicated by ◎, and one with elongation was indicated by x. (E) Smoothness The film surface of the master was measured with an Oken type smoothness meter, and the measured values were shown.

[0120]

[Table 5]

Example 15 Polyvinyl butyral (softening point: 87 ° C.) 4 parts (PVB3000-2 manufactured by Denki Kagaku Kogyo Co., Ltd.) Ethyl alcohol 35.5 parts Water 11.5 parts Needle-shaped magnesium silicate 0.8 part (Mizusawa Chemical Co., Ltd.) , Adeplus SP) After dissolving polyvinyl butyral resin in a mixture of ethyl alcohol and water, acicular magnesium silicate is added,
The mixture was sufficiently dispersed and mixed by a ball mill. The solution was filtered to obtain a coating solution. This coating solution was uniformly applied to a 3.5 μm-thick biaxially stretched polyester film by a wire bar coating method. Immediately after the application, the film was dried in hot air at 50 ° C. for 3 minutes to form a porous resin film on the polyester film, and a porous fiber film was formed in the same manner as in Example 1. Laminated. Wire diameter 0.6mm,
Using a wire bar of 0.8 mm, 1.0 mm, 1.2 mm, and 1.4 mm, samples were prepared in which the amount of the porous resin film attached was changed. Here, the area ratio 1 is 35% to 43%.
Met. The air permeability of the support having a porous resin membrane and a porous fiber membrane is 62 cm ³ / cm ^2.
Second, 53 cm ³ / cm ² · second, 57 cm ³ / cm ² · second, 4
At 8 cm ³ / cm ² · sec and 39 cm ³ / cm ² · sec, a sufficient image density without set-off was obtained with a stiffness of 65 mN. FIG. 10 shows the relationship between the stiffness and the image density.

The air permeability was measured by a stencil printer Preport VT3820 (product of Ricoh Co., Ltd.) at 10 cm × 1.
A solid chart of 0 cm is read, and a perforation corresponding to the solid is made on the sample.
er (air permeability tester; product of Toyo Seiki Seisaku-sho, Ltd.).

The film surface opening area ratio was determined by taking an enlarged photograph of the film surface with an optical microscope (magnification: 100 times).
Then, an enlarged copy (200%) is performed with a plain paper copier Imagio MF530 (manufactured by Ricoh Co., Ltd.). The OHP film is superimposed on the copy, and the opening is marked on the OHP film. Read the marked OHP film with a scanner (300 DPI, 256 gradations), image retouching software, Adobe Photoshop
It is binarized using op 2.5J. Then, the image area ratio of the marked opening is measured by using image analysis freeware software NIH image.

Example 16 Polyvinyl butyral (softening point: 87 ° C.) 4 parts (PVB3000-2 manufactured by Denki Kagaku Kogyo Co., Ltd.) Ethyl alcohol 35.5 parts Water 11.5 parts Resin film and many
A porous fiber membrane was formed. Here, the area ratio 1 is 33% to 4%.
It was 0%. In addition, a porous resin film and a porous fiber film are used.
The air permeability of the support is 60 cm ^Three/ Cm^Two・ Second, 3
1cm^Three/ Cm^Two・ Second, 26cm^Three/ Cm^Two・ Second, 21cm
^Three/ Cm^Two・ Second, 17cm^Three/ Cm^Two・ Decreased to seconds. Kosi
FIG. 10 shows the relationship between the image intensity and the image density.
As can be seen from FIG.
The master for stencil printing has a high image
The degree hardly changes. But do not add filler
In this example, the image density decreases as the stiffness increases
did. This is a support consisting of a porous resin membrane and a porous fiber membrane.
The air permeability of the carrier was reduced, and the ink flow was reduced.
It was me.

Example 17 Polyvinyl acetal 2 parts Ethyl alcohol 18 parts Water 13 parts Plate-like magnesium silicate (talc) 0.4 part (Microace P4 manufactured by Nippon Talc Co., Ltd.) Plate-like magnesium silicate is added to a resin solution of polyvinyl acetal. Thereafter, the mixture was dispersed and mixed in a ball mill. As in Example 14, a biaxially stretched polyester film having a thickness of 1.5 μm was uniformly coated with a wire bar. After application,
It was immediately dried in hot air at 50 ° C. for 3 minutes to form a porous resin film. Thereafter, a porous fiber membrane was further prepared in the same manner as in Example 1, and this was laminated on a porous resin membrane. Here, the area ratio 1 was 65% to 76%. Each air-permeable support comprising a porous resin film and a porous fiber membrane 54cm ³ / cm ² · sec, 60cm ³ / cm ² ·
Second, 56 cm ³ / cm ² · second, 46 cm ³ / cm ² · second, 3
FIG. 10 shows the relationship between the stiffness and the image density at 7 cm ³ / cm ² · sec.

Example 18 2 parts of polyvinyl acetal 18 parts of ethyl alcohol 13 parts of water A porous resin film and a porous fiber film were prepared in the same manner as in Example 6.
did. Here, the area ratio 1 was 61% to 72%. Many
Ventilation of a support having a porous resin membrane and a porous fiber membrane
54cm each ^Three/ Cm^Two・ Second, 39cm^Three/ Cm^Two
・ Second, 28cm^Three/ Cm^Two・ Second, 19cm^Three/ Cm^Two・ Second,
12cm^Three/ Cm^Two・ In seconds, the lower the strength of the body, the lower
I dropped it. FIG. 10 shows the relationship between the strength of the body and the image density.
It was shown in The addition of plate-like magnesium silicate
It can be seen that the image density is high even when the strength of the sheet increases. I
However, in this example where no filler is added,
As the distance increases, the image density sharply decreases. This phenomenon
Indicates that the area ratio is low and the porous resin film is not sufficiently formed.
And

Example 19 Polycarbonate 2 parts Polyvinyl butyral 1.1 parts Tetrahydrofuran 28 parts Ethyl alcohol 3.8 parts Carium titanate-based whisker 0.4 part (Tofica Y, manufactured by Otsuka Chemical Co., Ltd.) A mixture of polycarbonate and tetrahydrofuran and ethyl alcohol , And further added polyvinyl butyral as an adhesion improver between the porous resin film and the thermoplastic resin film, added a calcium titanate-based whisker to the dissolved resin solution, and thoroughly dispersed and mixed with a ball mill to form a coating solution. . On a 3.5 μm thick biaxially stretched film, 1.0 mm
A porous resin film was prepared by applying a uniform coating using a wire bar. Thereafter, a porous fiber membrane was further formed in the same manner as in Example 1, and this was laminated on a porous resin membrane. The area ratio 1 was 44%, and the air permeability of the support having the porous resin film and the porous fiber film was 142 cm ³ / cm ² · second. There is little set-off of printed matter, and the strength is 10m.
A master for heat-sensitive stencil printing used in the plate-making printing apparatus of the present invention having N and an image density of 1.05 was obtained.

Example 20 The atmosphere for coating a porous resin film on a film was changed to 23
C, 30% RH and 23 C, 90% RH,
In the same manner as in Example 15, a heat-sensitive stencil master used in the plate-making printing apparatus of the present invention was obtained.

Each master was prepressed under the same conditions using the thermosensitive stencil printing machine shown in FIG.
When zero sheets were printed, peeling of the porous resin film occurred in any of the heat-sensitive stencil masters prepared in an atmosphere of 23 ° C. and 90% RH.

[0130]

According to the first aspect of the present invention, in addition to obtaining a printed matter with good solid filling and less back stain, the following effects (1), (2) and (3) are brought about. (1) Since a porous resin film made of a resin is formed on the film, the perforation of the film is improved, and the pressing force of the platen roller can be reduced, so that the driving energy of the platen roller can be reduced. Energy consumption during plate making can be reduced. Further, since the driving system to be driven can be made smaller and the rigidity of the plate making unit can be made weaker, the size of the printing press main body can be made smaller and space can be saved. (2) Since the energy applied to the thermal head can be reduced, the energy consumption can be reduced and the life of the thermal head can be prolonged. (3) The prepress speed can be increased, and the first print time (the time from when the prepress start button is pressed until the first printed material comes out) can be reduced.

According to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, since the porous fiber film is further provided on the porous resin film, the master is prevented from being stretched during printing. A possible effect is brought. According to the third aspect of the present invention, master elongation during printing can be further prevented. According to the invention described in claims 4 to 10, printing with good image quality and perforation can be further performed. According to the eleventh aspect of the present invention, it is possible to prevent a conveyance jam and a skew in the printing press. According to the twelfth aspect of the present invention, a printed matter with less set-off is obtained.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of an example of a thermosensitive stencil master according to the present invention.

FIG. 2 is a schematic cross-sectional view of another example of the master for heat-sensitive stencil printing of the present invention.

FIG. 3 is a schematic sectional view of still another example of the master for heat-sensitive stencil printing of the present invention.

FIG. 4 is a schematic plan view of a porous resin film in one example of the master for heat-sensitive stencil printing of the present invention.

FIG. 5 is a perspective view of another example of the thermal stencil printing master of the present invention.

FIG. 6 is a schematic sectional view of a master for heat-sensitive stencil printing of the present invention.

FIG. 7 is a schematic sectional view of the master for thermal stencil printing of the present invention after perforation by a thermal head.

FIG. 8 is a schematic view showing the surface of a porous resin film of a master for heat-sensitive stencil printing obtained in Example 6.

FIG. 9 is a schematic diagram showing the surface of a porous resin film of the master for heat-sensitive stencil printing obtained in Example 9.

FIG. 10 is a diagram showing the relationship between the stiffness of a heat-sensitive stencil master and the image density in Examples 14 to 17 of the present invention.

FIG. 11 is a view schematically showing a heat-sensitive stencil printing machine of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thermoplastic resin film 3 Porous resin film opening part 4 Porous resin film 4a Wall-like film in the component constituting the porous resin film 4b Component constituting the porous resin film 5 Thermoplastic resin film hot perforated portion 7 Porous Fiber Membrane 10 Unprinted Master 10a Plate-Made Master 12 Plate Cylinder 12a No Opening 12b Opening (Mesh Screen) 13 Plate Making Part 14 Registration Roller 15 Press Roller 16 Peeling Claw 17 Plate Discharge Part 18 Transport Path 19 Platen Roller Reference Signs List 20 thermal head 21, 22 transport roller 23 cutter 24 guide plate 25 supply shaft 30 ink pipe 31 ink roller 32 doctor 33 supply hole 34 ink reservoir 35 stage 36 clamper 37 clamper shaft 38 arm shaft 39 roller support member 40 plate discharging boxes 41, 42 Plate discharge roller

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 2H084 AA13 AA38 BB20 CC09 2H114 AB23 AB25 BA05 BA06 BA10 DA49 DA51 DA52 DA56 DA76 FA02 FA08 GA11 4F100 AK01A AK01B AK21 AK41 AK54 AL05 BA02 BA03 BA10A BA10C CB00 DC11B01 DG00 EH462 JA04B JB16A JK04 JK15B YY00 YY00B

Claims (12)

[Claims] 1. A rotatable porous plate cylinder having at least a master locking means for locking a tip portion of a master on a part of an outer peripheral surface, and forming the master in accordance with image information. Plate-making means for transporting the set master around the outer peripheral surface of the plate cylinder, means for cutting the master made into a predetermined length, and a plate-making machine wound around the outer peripheral surface of the plate cylinder. Inking means for supplying the printing ink to the master, transfer means for transferring the printing ink passing through the plate-making master to the printing medium, and a plate discharging unit for peeling and removing the used master from the plate cylinder. A stencil printing machine comprising: a stencil printing machine provided with a master having a porous resin film made of a resin on one surface of a thermoplastic resin film. 2. A rotatable porous plate cylinder having at least a master locking means for locking the leading end of the master on a part of the outer peripheral surface, and forming the master according to image information. Plate-making means for transporting the formed master around the outer peripheral surface of the plate cylinder, means for cutting the master made to a predetermined length, Inking means for supplying the printing ink to the master, transfer means for transferring the printing ink that has passed through the plate-making master to a printing medium, and a plate discharging section for peeling and removing the used master from the plate cylinder. A plate-making printing apparatus comprising: a master having, as the master, a porous resin film made of a resin on one surface of a thermoplastic resin film, and further laminating a porous fiber film made of a fibrous substance on the surface. Heat-sensitive stencil making, characterized by the use of Printing device. 3. The stencil printing machine according to claim 1, wherein the components of the porous resin film of the master are connected to each other. 4. The stencil printing machine according to claim 1, wherein at least a part of the porous resin film in the master has a softening temperature of 150 ° C. or less. 5. The heat-sensitive stencil printing machine according to claim 1, wherein a part of the porous resin film in the master is no longer in the form of a film under the influence of printing ink. 6. The porous resin film of the master, wherein the total surface area of holes having a diameter of 5 μm or more when converted to a perfect circle on the surface thereof is in the range of 4 to 80% of the total surface area. A heat-sensitive stencil printing machine according to any one of claims 1 to 5. 7. The total opening area of holes having a diameter of 5 μm or more when converted into a perfect circle is 50% or more of the total opening area on the surface of the porous resin film.
A stencil printing machine according to any one of the above. 8. The heat-sensitive stencil printing apparatus according to claim 1, wherein the surface of the thermoplastic resin film of the master has a smoothness of 15,000 seconds or more. 9. The method according to claim 1, wherein at least a part of the porous resin film remains behind the perforated portion after perforating the thermoplastic resin film by a thermal head.
A stencil printing machine according to any one of claims 1 to 8. 10. The master is a thermoplastic resin film surface.
Is perforated so that the opening area ratio becomes 20% or more.
And the measured value in the air permeability tester is 1.0 cm ^Three/ cm^Two
・ Seconds to 157cm^Three/ cm^Two・ Characterized in the range of seconds
The heat-sensitive stencil making mark according to any one of claims 1 to 9.
Printing equipment. 11. The stencil printing machine according to claim 1, wherein the master has a bending stiffness of 5 mN or more. 12. When the thermoplastic resin film of the master is perforated by a thermal head, two to seven or less fibrous substances of the porous fiber membrane are traversed per one hole. The stencil printing machine according to any one of claims 2 to 11.