JP2003011532A - PRINTING PLATE AND IMAGE WRITING METHOD USING THE PRINTING PLATE - Google Patents

Abstract

(57) [Problem] To provide a printing plate for a waterless flat plate which enables writing with lower energy than in the past, and which does not require a residue removal process after writing. SOLUTION: A film (thermofusible film) 12 having heat fusibility is joined to a substrate 11 having fine irregularities on its surface while leaving a gap 11a, and a member having ink release properties (repellent) is formed thereon. (Ink layer) 13 is formed. When heat is applied from the outside, the heat-meltable film 12 is melted, holes are opened, and the ink-repellent layer 13 is removed. After that, by inking, the ink enters the holes to form an image portion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing plate material for an offset printing apparatus and an image writing method using the printing plate material.

[0002]

2. Description of the Related Art Plate materials that do not require dampening water are generally called waterless planographic printing plates. This plate has a silicone resin having ink repellency as a top layer and is composed of an intermediate layer composed of a substrate and a photosensitive resin. In the image writing method using this plate, first, by light writing, the exposed portion of the photosensitive resin is photopolymerized and crosslinked, and at the same time, is optically adhered and fixed to the silicone resin of the top layer. After that, the silicone resin is swollen with a solvent, and the portion of the silicone resin where the adhesiveness is lost (the portion not exposed) is removed to write an image on the plate. Since this method requires ultraviolet rays as light, writing cannot be performed with a simple semiconductor laser, and since treatment with a solvent is required,
There is an environmental problem.

In order to improve the conventional method as described above, Japanese Patent Laid-Open No. 7-314934 (lithographic printing member for laser radiation imaging apparatus) discloses that an ink-repellent silicone resin is heated by a powerful laser. A method of destroying is disclosed. Since this method directly destroys (ablates) the ink-repellent resin layer by heat, it has an advantage of not using a solvent or ultraviolet rays. But this method
Since a large amount of heat energy is required to destroy the resin layer, a high power laser is required. Therefore, there is a problem in that the entire device is large and expensive. Further, after destroying the ink repellent layer, it is necessary to remove the residue, and it is necessary to provide a residue removing and cleaning means for this purpose in the apparatus.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and it is possible to perform writing with lower energy than before, and water that does not require a lees removal process after writing. An object is to provide a plain lithographic plate and an image writing method using the waterless flat plate.

[0005]

According to a first aspect of the present invention, a support having fine irregularities is bonded to the support while maintaining the irregularities between the support and the support, and the heat melting property is thin. It is characterized by comprising a film-like member and an ink-releasing member formed on the film-like member.

According to a second aspect of the present invention, a thin film having a heat-melting property is formed by maintaining the irregularities between the support having fine irregularities and the support on the support, and joining in a stretched state. It is characterized by comprising a member and a member having an ink releasability formed on the film member.

A third aspect of the present invention is characterized in that, in the first or second aspect of the invention, the film-shaped member or the member having an ink releasability contains a light absorbing member.

The invention of claim 4 is characterized in that, in the invention of claim 1 or 2, a layer of a light absorbing member is formed between the film-like member and the member having the ink releasability. It is a thing.

A fifth aspect of the present invention is characterized in that, in the first to fourth aspects, the member having the ink releasability contains polyorganosiloxane.

According to a sixth aspect of the present invention, in the first to fourth aspects, the member having the ink releasability contains a polymer containing a perfluoroalkyl group or a perfluoroalkylene group in a polymer skeleton. It is a feature.

The invention of claim 7 is characterized in that, in the invention of claims 1 to 6, the support is a roughened film substrate.

The invention of claim 8 is characterized in that, in the invention of claims 1 to 6, the support is a thin non-woven fabric formed on a film substrate.

The invention of claim 9 is characterized in that, in the invention of claims 1 to 8, a layer of a lubricating member is formed on the layer of the member having the ink releasability.

A tenth aspect of the present invention uses the printing plate material according to any one of the first to ninth aspects, wherein the plate surface of the printing plate material is heated by a thermal head or a laser according to an image signal, and the heat-meltable film is formed. It is characterized in that an image is formed by mechanically changing the shape of the member.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. 1 to 7 showing sectional views of a printing plate material, and FIG. 8 showing a sectional view of a main part of a thermal head writing device, and a laser writing device. This will be described with reference to FIG. 9 showing a cross-sectional view of the relevant part.

(Explanation of Claim 1) FIG. 1 is a sectional view for explaining a printing plate material according to Example 1 of the present invention.
FIG. 4 is a diagram for explaining an image writing operation on the printing plate material having the structure shown in FIG. 1.

As shown in FIG. 1, a printing plate material 10 is a film having a heat-melting property (a heat-melting film) while leaving voids 11a on a substrate 11 having fine irregularities on the surface.
12 is joined, and a member (ink repellent layer) 13 having ink releasability is formed thereon.

When heat is applied from the outside as shown in FIG. 2 (A), as shown in FIG. 2 (B), the heat fusible film 1
2 melts and has holes 10a. At this time, a space 1 having an extremely high heat insulating property is provided between the heat-meltable film 12 and the substrate 11.
Because of the presence of 1a, the heat-meltable film 12 is directly attached to the substrate
The holes 10a are formed with a lower energy than that when joining. As shown in FIG. 2B, the upper ink-repellent layer 13
2C and 2D, the ink easily enters the holes 10a by inking using the ink roller 1 to form an image portion, as shown in FIGS. 2C and 2D. .

The surface roughness of the substrate 11 having a rough surface is RZ.
The (10-point average roughness) is preferably in the range of 10 μm to 100 μm. The thinner the heat-meltable film 12, the better the heat sensitivity, but the mechanical strength is poor. As a result of intensive studies by the present inventors, the thickness of the heat-meltable film 12 is 1 μm.
It was found that the range of 3 μm is preferable.

If the thickness of the upper ink repellent layer 13 is smaller, the residue does not appear, but the mechanical strength becomes poor. Therefore, the thickness of the upper layer is preferably in the range of 0.1 μm to 1 μm. Further, the range of 0.2 μm to 0.5 μm is suitable. Further, as the ink repellent layer 13, a fluororesin-based member or a silicone resin-based member is suitable.

As a method for joining the heat-melting film 12 and the substrate 11, a thin adhesive is applied in advance on the heat-melting film 12 side and lightly contacting the convex portion of the substrate 11 so as to make a point contact, and then joining. The method and the method of lightly heat-sealing are suitable. In addition, the heat-expandable microcapsules contained in the adhesive,
After joining the substrate 11 and the heat-fusible film 12, it is preferable to heat the microcapsules to form the voids 11 a between the substrate 11 and the heat-meltable film 12.

[0022] (Example 1) Ink repellent material: Silicone resin                 (Shin-Etsu Chemical "X-52") Hot-melt film: Polyethylene terephthalate film                 (Toray “Lumirror” thickness 1 μm) Substrate: PET film with coating mat                 (Thickness 100 μm. Surface roughness (Rz) 10 μm, 20 μm, 5                   3 types of 0 μm)

Method for producing plate: A substrate having each surface roughness is coated with an epoxy adhesive (thickness: 0.1 μm), and a heat-meltable film is bonded to the substrate so that voids are not crushed. Then, a coating liquid obtained by diluting the ink repellent member to a solid content of 1 wt% is coated on the heat-meltable film so as to have a thickness of 0.2 μm to form an ink repellent layer.

Writing evaluation: Using a thermal head,
According to the image signal, only the area of the image portion was contact-heated. After writing the image, printing was performed with a commercially available waterless planographic ink using a commercially available offset printing machine. 10 μm, 20
Good printability was obtained with each of the plates having a roughness of 50 μm and 50 μm. Surface roughness of 5 μm and 150 μm for comparison
The plate using the substrate was also evaluated, but since the 5 μm plate has no void, the normal writing energy (300 mJ /
cm ² ), no image could be formed. Also, 150
In the μm plate, the unevenness of the plate surface was too large, so that the solid image was not filled up well. Further, since no film residue was generated after writing, printing could be performed as it was without post-treatment.

(Explanation of Claim 2) FIG. 3 is a diagram for explaining a printing plate material according to a second embodiment of the present invention. Figure 3
As shown in (A), in the printing plate material 20 of the present invention, the heat-meltable film 22 is stretched and bonded to the substrate 21, so that the heat-meltable film 22 is always subjected to internal stress. . Therefore, as shown in FIG. 3 (B), when the heat-fusible film 22 has the holes 20a, the holes 20a are formed with a lower energy than that of the printing plate material in which no internal stress is applied to the heat-meltable film. Evil. This is similar to just bursting a balloon by hitting it with a needle.
That is, when the heat-meltable film 22 which is always under tension has a small hole 20a due to heat, the hole 20a suddenly becomes large as the balloon bursts, and the hole 2a suitable for an image is formed.
There is 0a. After that, as shown in FIGS. 3C and 3D, the ink easily enters the holes 20a by inking and forms an image portion.

Here, the heat-fusible film 22 is formed on the substrate 21.
As a method of joining the stretched film while it is stretched, a method of previously applying an adhesive to the heat-meltable film 22 and then laminating it on the substrate 21 while applying tension to the heat-meltable film 22 is suitable.

[0027] (Example 2) Ink repellent material: Silicone resin                 (Shin-Etsu Chemical "X-52") Hot-melt film: Polyethylene terephthalate film                 (Toray “Lumirror” thickness 1 μm) Substrate: PET film with coating mat                 (Thickness 100 μm. Surface roughness (Rz) 10 μm, 20 μm, 5                   3 types of 0 μm)

Method of producing plate: A substrate having each surface roughness is coated with an epoxy adhesive (thickness: 0.1 μm), and a heat-meltable film is bonded to the substrate so that voids are not crushed. At this time, 160d in the uniaxial direction with respect to the heat-meltable film
Join while pulling at yn / cm. afterwards,
A coating liquid obtained by diluting the ink repellent member to a solid content of 1 wt% is coated on the heat-meltable film so as to have a thickness of 0.2 μm to form an ink repellent layer.

Writing evaluation: Using a thermal head
According to the image signal, only the area of the image portion was contact-heated. After writing the image, printing was performed with a commercially available waterless planographic ink using a commercially available offset printing machine. 10 μm, 20
Good printability was obtained with each of the plates having a roughness of 50 μm and 50 μm. At this time, the writing energy could be reduced by about 20% as compared with the case where the film was not stretched (without stretching: 300 mJ / cm ² , with stretching: 240 mJ / c).
m ² ).

(Explanation of Claim 3) FIG. 4 is a diagram for explaining a printing plate material according to a third embodiment of the present invention. Figure 4
As shown in (A), the printing plate material 30 includes a substrate 31 having fine irregularities on the surface thereof, a heat-meltable film 32 bonded thereto while leaving voids 31a, and a light-absorbing member contained thereon. The ink repellent layer 33 is formed. Further, as shown in FIG. 4 (B), the printing plate member 40 has a substrate 41 having fine irregularities on its surface and a heat-melting film 42 containing a light-absorbing member bonded to the substrate 41 while leaving voids 41a. Then
The ink-repellent layer 43 is formed on it.

Dyes and pigments are suitable as the light absorbing member, and the ink repellent layer 33 or the heat-meltable film 42 contains these dyes or pigments. The content is 1 wt% to 4 wt% for dyes and 10 wt% to 30 for pigments.
wt% is suitable. The dye is preferably a cyanine-based or phthalocyanine-based dye.

[0032] (Example 3) Ink repellent material: Silicone resin                 (Shin-Etsu Chemical "X-52") Hot-melt film: Polyethylene terephthalate film                 (Toray “Lumirror” thickness 3 μm) Substrate: PET film with coating mat                 (Thickness 100 μm. Surface roughness (Rz) 10 μm) Light absorber: Carbon black

Method for producing plate: A substrate having each surface roughness is coated with an epoxy adhesive (thickness: 0.1 μm), and a heat-meltable film is bonded to the substrate so that voids are not crushed. After that, a coating liquid containing a light absorbing agent in a solid content of 20 wt% and an ink repellent member in a solid content of 5 wt% has a thickness of 0.2 μm.
To form an ink repellent layer by coating on a heat-meltable film.

Writing evaluation: Using a laser of 100 mW, only the area of the image portion was non-contact heated according to the image signal. After writing the image, use a commercially available offset printing machine,
Printing was carried out with a commercially available waterless planographic ink, and good printability was obtained.

(Explanation of Claim 4) FIG. 5 is a diagram for explaining a printing plate material according to Example 4 of the present invention. Figure 5
As shown in FIG. 5, the printing plate material 50 is a light-absorbing layer containing a light-absorbing agent on which a heat-meltable film 52 is bonded while leaving voids 51a on a substrate 51 having fine irregularities on the surface. 54, and the ink repellent layer 53 is further formed thereon.

The thickness of the light absorption layer 54 is 0.5 μm to 2 μm.
μm, more preferably 1 μm to 1.5 μm. A dye or a pigment is suitable for the light absorbing member, and the light absorbing layer 54 is formed of the heat-meltable film 52 or the upper ink repellent layer 53 containing the dye or pigment. The content is 1 to 4 wt% for dyes and 10w for pigments.
t% to 30 wt% is suitable. The light absorbing layer 54 may or may not have a binder resin.

[0037] (Example 4) Ink repellent material: Silicone resin                 (Shin-Etsu Chemical "X-52") Hot-melt film: Polyethylene terephthalate film                 (Toray “Lumirror” thickness 3 μm) Substrate: PET film with coating mat                 (Thickness 100 μm. Surface roughness (Rz) 10 μm) Light absorber: Carbon black + urethane binder resin

Method for producing plate: A substrate having each surface roughness is coated with an epoxy adhesive (thickness: 0.1 μm), and a heat-meltable film is bonded to the substrate so that voids are not crushed. After that, a coating liquid containing a light absorbing agent in a solid content of 5% is coated on the film to form a light absorbing layer. After that, a coating liquid obtained by diluting the ink repellent member to a solid content of 1 wt% was formed to a thickness of 0.
The ink-repellent layer is formed by coating the heat-meltable film so as to have a thickness of 2 μm.

Writing evaluation: Using a laser of 100 mW, only the area of the image portion was non-contact heated according to the image signal. After writing the image, use a commercially available offset printing machine,
Printing was carried out with a commercially available waterless planographic ink, and good printability was obtained.

(Explanation of Claim 5) In the printing plate material, a heat-fusible film is bonded while leaving voids on a substrate having fine irregularities on the surface, and an ink repellent ink containing polyorganosiloxane thereon. A layer is formed. In particular, it is better to contain a crosslinked polyorganosiloxane in the ink repellent layer because the mechanical strength becomes higher. When the ink is an oil-based ink for offset printing, by containing polyorganosiloxane in the member of the upper layer, WFBL
Based on the theory, very good ink releasability can be obtained.
At this time, in order to increase the mechanical strength, a binder resin may be contained.

[0041] (Example 5) Ink repellent material: Silicone resin                 (Toray Dow Corning "BY24-486C") Hot-melt film: Polyethylene terephthalate film                 (Toray “Lumirror” thickness 3 μm) Substrate: PET film with coating mat                 (Thickness 100 μm. Surface roughness (Rz) 10 μm) Light absorber: Carbon black + urethane binder resin

Method for producing plate: A substrate having each surface roughness is coated with an epoxy adhesive (thickness: 0.1 μm), and a heat-meltable film is bonded to the substrate so that voids are not crushed. After that, a coating liquid containing a light absorbing agent in a solid content of 5% is coated on the film to form a light absorbing layer. After that, a coating liquid obtained by diluting the ink repellent member to a solid content of 1 wt% was formed to a thickness of 0.
The ink-repellent layer is formed by coating the heat-meltable film so as to have a thickness of 2 μm.

Writing evaluation: Using a laser of 100 mW, only the area of the image portion was heated in a non-contact manner according to the image signal. After writing the image, use a commercially available offset printing machine,
Printing was carried out with a commercially available waterless planographic ink, and good printability was obtained.

(Explanation of Claim 6) The ink repellent layer of the printing plate material contains a polymer containing a perfluoroalkyl group or a perfluoroalkylene group in the polymer skeleton.

When the ink solvent is a water-based ink composed of water or a glycol polar solvent, the ink releasability is better as the surface energy of the ink repellent layer is lower. A coating in which the perfluoroalkyl group is oriented in the direction perpendicular to the substrate has the lowest surface energy. However, even if the perfluoroalkyl group is not necessarily oriented perpendicular to the surface, if the surface tension of the ink is in the range of 50 to 70 dyn / cm,
Further, a member containing a polymer containing a perfluoroalkyl group in the polymer skeleton and having a surface energy of 10 to 2
It was found that the printability was excellent if the member had a range of 0 dyn / cm. As a concrete member, an acrylate polymer having a perfluoroalkyl group in its side chain, a PFA resin, or the like is preferable, and a PTFE or FEP resin having a perfluoroalkylene group in its main chain skeleton is suitable. Further, in addition to the straight vinyl polymer, a cyclic polymer may be used.

[0046] (Example 6) Ink repellent material: Fluorine resin                 (Asahi Glass "Cytop") Hot-melt film: Polyethylene terephthalate film                 (Toray “Lumirror” thickness 3 μm) Substrate: PET film with coating mat                 (Thickness 100 μm. Surface roughness (Rz) 10 μm) Light absorber: Carbon black + urethane binder resin

Method for producing plate: A substrate having each surface roughness is coated with an epoxy adhesive (thickness: 0.1 μm), and a heat-meltable film is bonded to the substrate so that voids are not crushed. After that, a coating liquid containing a light absorbing agent in a solid content of 5% is coated on the film to form a light absorbing layer. After that, a coating liquid obtained by diluting the ink repellent member to a solid content of 1 wt% was formed to a thickness of 0.
The ink-repellent layer is formed by coating the heat-meltable film so as to have a thickness of 2 μm.

Writing evaluation: Using a laser of 100 mW, only the area of the image portion was heated in a non-contact manner according to the image signal. After writing the image, use a commercially available offset printing machine,
Printing was performed with an aqueous high-viscosity ink, and good printability was obtained.

(Explanation of Claim 7) As for the surface roughness of the substrate of the printing plate material, the ten-point average roughness is 10 μm or more and 20 μm.
The following is desirable. The reason is that when the thickness is 10 μm or less, the ink-holding layer when the ink is held in the holes becomes 10 μm or less after the heat-meltable film on the substrate has holes. It becomes difficult to obtain the ideal value of the ink layer thickness of 1 μm, and the image density decreases. On the other hand, if it is 20 μm or more, the ink holding layer becomes too thick and the dot gain becomes 2 times or more, resulting in poor image quality of a halftone image.

[0050] Ink repellent material: Silicone resin                 (Shin-Etsu Chemical "X-52") Hot-melt film: Polyethylene terephthalate film                 (Toray “Lumirror” thickness 3 μm) Substrate: PET film processed with sand mat                 (Thickness 100 μm. Surface roughness (Rz) 5 μm, 20 μm) Light absorber: Carbon black + urethane binder resin

Method for producing plate: A substrate having each surface roughness is coated with an epoxy adhesive (thickness: 0.1 μm), and a heat-meltable film is bonded to the substrate so that voids are not crushed. After that, a coating liquid containing a light absorbing agent in a solid content of 5% is coated on the film to form a light absorbing layer. After that, a coating liquid obtained by diluting the ink repellent member to a solid content of 1 wt% was formed to a thickness of 0.
The ink-repellent layer is formed by coating the heat-meltable film so as to have a thickness of 2 μm.

Writing evaluation: Using a laser of 100 mW, only the area of the image portion was non-contact heated according to the image signal. After writing the image, use a commercially available offset printing machine,
Printing was carried out using a commercially available waterless planographic ink, and good printing suitability was obtained for each plate of each roughness.

(Explanation of Claim 8) FIG. 6 is a view for explaining a printing plate material according to Example 8 of the present invention. Figure 6
As shown in FIG.
By bonding a thin non-woven fabric 61c onto the substrate b, the voids 6 are formed on the substrate 61 formed to have fine irregularities on the surface.
While leaving 1a, a heat-meltable film 62 containing a light absorber is bonded and an ink repellent layer 63 is formed thereon. The light absorber may be contained in the ink repellent layer 63, and the heat fusible film 62 and the ink repellent layer 63 may be included.
A light absorption layer may be formed between them.

The non-woven fabric 61c referred to here is 0.1 μm.
A member in which fibers having a size of 50 μm or less are woven non-uniformly and solidified without weaving. The fibers may be resin or metal, or may be solidified short fibers such as Japanese paper. The non-woven fabric 61c and the film-like substrate 61b may be joined by either thermocompression bonding or resin adhesive bonding. If the thickness of the nonwoven fabric 61c is too thin, it is difficult to process, and if it is too thick, the cost increases. From this viewpoint, the thickness is 2 μm.
To 20 μm is desirable.

[0055] (Example 8) Ink repellent material: Silicone resin                 (Shin-Etsu Chemical "X-52") Hot-melt film: Polyethylene terephthalate film                 (Toray “Lumirror” thickness 3 μm) Substrate: glossy PET film                 (Toray “Lumirror S-10” thickness 100 μm) Nonwoven fabric: Used as a plate master for Ricoh's stencil printer "Preport"                 Nonwoven fabric Light absorber: Carbon black + urethane binder resin

Method for producing plate: A non-woven fabric is attached to a film-like substrate with an epoxy adhesive and then coated with an epoxy adhesive (thickness 0.1 μm) so that voids do not collapse in the non-woven fabric coated with the adhesive. The heat fusible films are joined together as described above. After that, a coating solution containing a light absorbing agent in a solid content of 5% is coated on the heat-meltable film to form a light absorbing layer. Then, a coating liquid obtained by diluting the ink repellent member to a solid content of 1 wt% is coated on the heat-meltable film so as to have a thickness of 0.2 μm to form an ink repellent layer.

Writing evaluation: Using a laser of 100 mW, only the area of the image portion was non-contact heated according to the image signal. After writing the image, use a commercially available offset printing machine,
Printing was carried out with a commercially available waterless planographic ink, and good printability was obtained.

(Explanation of Claim 9) FIG. 7 is a view for explaining a printing plate material according to Example 9 of the present invention. Figure 7
As shown in FIG. 7, the printing plate material 70 has a substrate 71 formed so as to have fine irregularities, a heat-meltable film 72 bonded to the substrate 71 while leaving voids 71a, and an ink repellent layer 73 thereon.
Is formed, and the lubricating layer 75 is further formed thereon.

When the means for writing an image on the printing plate material 70 is a contact heating means such as a thermal head, mechanical damage may occur on the surface of the printing plate material 70. Therefore, a layer 75 of a lubricating member is formed on the outermost surface of the printing plate material 70 to improve the slippage between the contact heating means and the plate material to reduce mechanical damage. As the lubrication member, a method of applying solid fine particles of fluorine resin or silicone resin is suitable. At this time, it is preferable that there is no binder for fixing the fine particles in order to make it more slippery and not to deteriorate the ink repellency. If the outer diameter of the fine particles is too large, the contact property with the contact heating member will be impaired and sufficient heating will not be carried out. If it is too small, the fine particles will coagulate. Therefore, 0.5 μm or more and 2 μm or less is desirable.

[0060] (Example 9) Ink repellent material: Silicone resin                 (Shin-Etsu Chemical "X-52") Hot-melt film: Polyethylene terephthalate film                 (Toray “Lumirror” thickness 1 μm) Substrate: PET film with coating mat                 (Thickness 100 μm. Surface roughness (Rz) 10 μm, 20 μm, 5                 3 types of 0 μm) Lubricant: Silicone particles                 (Toshiba Silicone "Tospearl", ball diameter 0.5μm, 2μm)

Method for producing plate: A substrate having each surface roughness is coated with an epoxy adhesive (thickness: 0.1 μm), and a heat-meltable film is bonded to the substrate so that voids are not crushed. At this time, the film is bonded while being pulled uniaxially by 1.6 g / mm. After that, a coating liquid obtained by diluting the ink repellent member to a solid content of 1 wt% has a thickness of 0.2 μm.
Then, the ink-repellent layer is formed by coating the heat-fusible film so that the thickness becomes m.

Writing evaluation: Using a thermal head
According to the image signal, only the area of the image portion was contact-heated. After writing the image, printing was performed with a commercially available waterless planographic ink using a commercially available offset printing machine. 10 μm, 20
Good printability was obtained with each of the plates having a roughness of 50 μm and 50 μm. At this time, the writing energy could be reduced by about 20% as compared with the case where the film was not stretched (without stretching: 300 mJ / cm ² , with stretching: 240 mJ / c).
m ² ). Moreover, sticking due to heating did not occur at all.

(Explanation of Claim 10) FIG. 8 is a sectional view of a main part of a thermal head writing apparatus for explaining an image writing method according to a tenth embodiment of the present invention, and FIG.
Similarly, it is a laser writing apparatus for explaining an image writing method according to Example 10 of the present invention. These devices are specific examples of so-called on-press machines using the printing plate material as described above.

(Embodiment 10) In FIG. 8, the printing plate material 80 is in the form of a sheet or a roll and has a mechanism for winding it around the plate cylinder 2 immediately before printing. Then, the printing plate material 80 is heated according to the image signal, and then printing is performed. In FIG. 9, a mechanism for unwinding and winding up the printing plate material 90 is provided in the plate cylinder 5. After unwinding one image, writing is performed by the laser 6, and then printing is performed.

Although the inking mechanism is omitted in FIGS. 8 and 9, either a conventional multi-stage inking roller or a keyless inking may be used. The laser 6 is preferably a plurality of lasers 6 arranged in an array, and the thermal head 3 is preferably line thermal.

[0066]

According to the present invention, as compared with the conventional ablation type printing plate material, the substrate has voids having a high heat insulating effect, so that the writing energy can be greatly reduced. Also,
Since no residue is generated, a post-processing step and an apparatus can be unnecessary when writing.

According to the present invention, as compared with the conventional ablation type printing plate material, the substrate has voids having a high heat insulating effect, and the heat-meltable film is joined in a stretched state. Therefore, the writing energy can be further reduced significantly. In addition, since no residue is generated, a post-processing step and a device can be unnecessary when writing.

According to the present invention, since the light absorbing member is contained in the member having the heat melting property or the member having the ink releasability, it is possible to perform non-contact heating, and hence the plate surface of the printing plate material. Will not be damaged.

According to the present invention, since the light absorbing layer and the ink repellent layer are separated from each other, the production of the printing plate material capable of non-contact heating is easy to manage.

According to the present invention, since the polyorganosiloxane is contained in the member having the releasability of the ink, it is possible to provide a printing plate material having extremely excellent printability with respect to the oil-based ink.

According to the present invention, the polymer having a perfluoroalkyl group or a perfluoroalkylene group in the polymer skeleton is contained in the member having the ink releasability, so that the printability to the aqueous ink is improved. An extremely excellent printing plate material can be obtained.

According to the present invention, since the film-like substrate is roughened to form fine irregularities, the printing plate material can be manufactured at low cost.

According to the present invention, since fine irregularities are formed by using a non-woven fabric, the ink can be stably retained in the image area, and the image quality stability in repeated printing can be increased.

According to the present invention, since the layer of the lubricating member is provided according to the present invention, sticking with a contact heating source such as a thermal head is eliminated, so that the image is free from color unevenness on the banding and the image quality is improved. Can be higher.

According to the tenth aspect of the present invention, compared with the conventional ablation type plate, since the void has a high heat insulating effect, the writing energy can be greatly reduced. In addition, since no residue is generated, a post-processing step and a device can be unnecessary when writing. Further, as compared with a conventional printing machine, it enables operator-less and simple printing.

[Brief description of drawings]

FIG. 1 is a cross-sectional view illustrating a printing plate material according to a first embodiment of the present invention.

FIG. 2 is a diagram for explaining an image writing operation using the printing plate material having the structure shown in FIG.

FIG. 3 is a diagram for explaining a printing plate material according to a second embodiment of the present invention.

FIG. 4 is a diagram for explaining a printing plate material according to a third embodiment of the present invention.

FIG. 5 is a diagram for explaining a printing plate material according to a fourth embodiment of the present invention.

FIG. 6 is a diagram for explaining a printing plate material according to Example 8 of the present invention.

FIG. 7 is a diagram illustrating a printing plate material according to a ninth embodiment of the present invention.

FIG. 8 is a cross-sectional view of essential parts of a thermal head writing device for explaining an image writing method according to example 10 of the present invention.

FIG. 9 is a cross-sectional view of essential parts of a laser writing device for explaining an image writing method according to a tenth embodiment of the present invention.

[Explanation of symbols]

1 ... Inking roller, 2, 5 ... Plate cylinder, 3 ... Thermal head, 4 ... Platen roller, 6 ... Laser, 10, 20,
30, 40, 50, 60, 70, 80, 90 ... Printing plate, 10a, 20a ... Holes 11, 21, 31, 41, 5
1, 61, 71 ... Substrate, 11a, 21a, 31a, 41
a, 51a, 61a, 71a ... void, 61b ... film substrate, 61c ... non-woven fabric, 12, 22, 32, 42, 5
2, 62, 72 ... Thermal melting film, 13, 23, 3
3, 43, 53, 63, 73 ... Ink repellent layer, 54 ... Light absorbing layer, 75 ... Lubrication layer.

Claims (10)

[Claims] 1. A support having fine irregularities, a heat-meltable thin film member on the support which is joined while maintaining the irregularities on the support, and a top of the film member. A plate material for printing, comprising a member having releasability of ink formed in the above. 2. A support having fine irregularities, a heat-melting thin film-like member which is joined in the stretched state while maintaining the irregularities on the support, and the film. A printing plate material comprising a member having ink releasability formed on a strip-shaped member. 3. The printing plate material according to claim 1, wherein the film-shaped member or the member having the ink releasability contains a light absorbing member. . 4. The printing plate material according to claim 1 or 2, wherein a layer of a light absorbing member is formed between the film-shaped member and the member having the ink releasability. Printing plate material. 5. The printing plate material according to claim 1, wherein the member having ink releasability contains polyorganosiloxane. 6. The printing plate material according to claim 1, wherein the member having ink releasability contains a polymer containing a perfluoroalkyl group or a perfluoroalkylene group in a polymer skeleton. A printing plate material characterized by being. 7. The printing plate material according to claim 1, wherein the support is a roughened film substrate. 8. The printing plate material according to claim 1, wherein the support is a thin non-woven fabric formed on a film substrate. 9. The printing plate material according to claim 1, wherein a layer of a lubricating member is formed on the layer of the member having the ink releasability. Material. 10. Using the printing plate material according to claim 1, the plate surface of the printing plate material is heated by a thermal head or a laser according to an image signal, and the heat-meltable film is formed. An image writing method, characterized in that an image is formed by mechanically changing the shape of a member.