JP3659619B2 - How to correct a burned document - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for correcting a transparent original for photographic printing used for producing a silk screen printing plate or the like.
[0002]
[Prior art]
In order to produce a printing plate such as a silk screen printing plate by a photographic method, an original for printing on the printing plate is required. Such a manuscript is generally produced through a plurality of plate making processes such as plate making, and is calibrated many times. This has led to high costs, particularly in the case of small lot printing.
[0003]
On the other hand, in recent years, ink jet printers have spread rapidly, and image quality has been improved accordingly.
For this reason, the inventors of the present invention have considered making a block composition with a personal computer or the like and preparing a printed document with an ink jet printer. However, there are cases where correction is required after the printed document is prepared. It turned out that correction was difficult with inkjet output paper. In other words, in order to make corrections in conventional inkjet recording paper, the ink receiving layer is scraped off or the ink receiving layer is dissolved by using a solvent such as water, but this is very time-consuming and requires a lot of work. In some cases, there is a difference in the light transmission density between the non-printed portion and the printing plate.
[0004]
[Problems to be solved by the invention]
The present invention has been made in view of such circumstances, and for the production of a transparent original for photographic printing used to produce a silk screen printing plate or the like, it reduces the plate making cost and labor in a series of plate making steps, It is another object of the present invention to provide a simple method for correcting a printed original by using a printed original film that can be easily corrected.
[0005]
[Means for Solving the Problems]
The method for correcting a printed original according to the present invention that achieves the above-described object includes a printed original having an ink receiving layer that is releasable from the plastic film and is receptive to ink for an ink jet printer on at least one side of the plastic film. After an image is output to the ink receiving layer of the film by an ink jet printer, the unnecessary portion of the ink receiving layer is cut and removed . In addition, “center line average roughness Ra” in the present invention means “Ra ₇₅ ” in JIS-B0601.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The present invention is described in detail below.
As the plastic film of the present invention, a film or sheet that does not impair transparency, such as polyethylene terephthalate, polybutylene terephthalate, polycarbonate, polypropylene, polyethylene, acrylic, acetylcellulose, vinyl chloride, and fluororesin, can be used. An axially stretched one is preferred because mechanical strength and dimensional stability are improved. The thickness can be appropriately selected depending on the material to be applied, but generally a range of 25 to 188 μm is preferable, and a range of 38 to 125 μm is particularly preferable in terms of transportability to a printer and image density. The plastic film preferably has a high light transmittance because it is used as a transmission original, and the centerline average surface roughness is preferably 0.40 μm or less. The reason why the surface roughness is set to 0.40 μm or less is to prevent the diffuse light transmittance with respect to the total light transmittance from increasing and hindering clear printing. Furthermore, in order to produce a plurality of plates in multicolor printing, the original film requires a highly transparent film that can be viewed in a superimposed manner.
[0007]
Next, the ink-jet ink receiving layer of the present invention is a layer for printing and drying by a commercially available ink-jet printer, has receptivity to ink for ink-jet printer, and is usually a single layer or multilayer, It is composed of a hydrophilic polymer or a water-soluble polymer.
[0008]
Further, such an ink receiving layer needs to be laminated so as to be peelable from the plastic film. As a method of configuring the ink receiving layer so as to be peelable from the plastic film, a method of performing a conventionally known mold release treatment on the surface of the plastic film, a method of providing a peeling adjusting layer on the plastic film, and a relationship with the plastic film to be used Examples thereof include a method of selecting or blending a resin constituting an ink receiving layer, which will be described later, so as to have releasability. In the case of providing the peeling adjustment layer, the peeling adjustment layer may be left on the plastic film after peeling or may be peeled off together with the ink receiving layer.
[0009]
Examples of the hydrophilic polymer or water-soluble polymer constituting the ink receiving layer include polyvinyl alcohol, polyvinyl pyrrolidone, water-soluble cellulose resin, water-soluble polyester resin, polyvinyl acetal, acrylic acid, acrylamide copolymer, melamine resin, and polyether. Examples include synthetic resins such as polyols or cross-linked products thereof, natural resins such as gelatin, casein, starch, chitin, and chitosan, and water-soluble polymers that are appropriately water-resistant as required, such as water-soluble polymers such as polyvinyl alcohol and polyvinylpyrrolidone. One or more compounds such as a compound obtained by curing a functional resin by a known method, a water-soluble resin having a cinnamoyl group, a stilbazolium group, a stilquinolium group, and a diazo group can be used.
[0010]
In addition, various additives such as pigments, mold release agents, dispersants, fluorescent dyes, pH adjusting agents, antifoaming agents, wetting agents, preservatives, antioxidants, surfactants, and the like, are necessary for the ink receiving layer. However, it is desirable to add a pigment in consideration of ink absorptivity, drying property and antiblocking effect.
[0011]
The pigment is added in an amount of 200 parts by weight or less, preferably 150 parts by weight or less, based on 100 parts by weight of the hydrophilic polymer or water-soluble polymer. The reason why it is set to 200 parts by weight is to prevent adverse effects such as a decrease in light transmittance and a brittle coating. Examples of the pigment include silica, calcium carbonate, barium sulfate, talc, lucentite, mica, and resin fine particles. However, when alumina is used, about 95 parts by weight may be added to 5 parts by weight of the hydrophilic polymer or water-soluble polymer.
[0012]
The thickness of the inkjet ink receiving layer is preferably about 1 μm to 100 μm, more preferably about 5 μm to 50 μm. The thickness of 100 μm or less is in consideration of the light transmittance and the workability of peeling from a plastic film. The thickness of 1 μm or more causes insufficient ink absorption and causes blurring of the ink image or ink drying. In addition to avoiding troubles in the performance, the workability of peeling from the plastic film is taken into consideration.
[0013]
Further, although it cannot be generally stated depending on the photosensitive material used, it is preferable that the ink receiving layer is configured to have a transmission densitometer (TD904: Macbeth) UV filter of 0.5 or less. Furthermore, it is desirable that the transmission density difference between the peeled portion and the non-peeled portion is 0.3 or less, preferably 0.1 or less, with the UV filter. The reason why the density difference is set to 0.3 or less is to prevent the inconvenience that the state of the document is different between the peeling portion and the non-peeling portion.
[0014]
Such an ink-jet ink receiving layer is prepared by preparing a coating solution obtained by dissolving or dispersing a resin to which a pigment or the like is added, if necessary, in an appropriate solvent, a roll coater, a Mayer bar coater, an air knife coater, a gravure coater, It can be formed by applying and drying on at least one surface of the plastic film or the release adjusting layer by a closed die method or the like.
[0015]
According to the film for manuscript of the present invention, by outputting image information such as characters, figures and various data edited on a computer with an ink jet printer, and cutting an unnecessary part with a cutter or the like to peel off, A corrected printed document can be easily obtained.
[0016]
【Example】
Hereinafter, the present invention will be described in more detail based on examples. In this example, “parts” and “%” are based on weight unless otherwise specified.
[0017]
[Example 1]
A coating liquid for inkjet ink receiving layer having the following composition was applied by bar coating on a 75 μm thick polyester film (Lumirror T-60, Ra 0.006 μm: Toray Industries Inc.), and after drying, an inkjet ink receiving layer having a thickness of about 20 μm. A film for printing originals was obtained.
[0018]
<Ink receiving layer>
・ Polyvinyl alcohol (GOHSENOL NH-20: Nippon Synthetic Chemical Industry Co., Ltd.) 5 parts ・ Silica (Mizukasil P-78F: Mizusawa Chemical Co., Ltd.) 0.1 part ・ Water 45 parts [0019]
The original film was printed with a monochrome image by an inkjet printer (PM-750C: Seiko Epson), and the printed part of the ink receiving layer was cut with a cutter to peel and remove. Thereafter, this film was used as a transparent original and adhered and baked on a photosensitive film for silk screen (SAF-10: Aicero Chemical Co., Ltd.) and developed to prepare a printing plate. When this printing plate was used for printing, a printed material with no noticeable peeled part was obtained.
[0020]
The transmission density (TD904: Macbeth) of the ink receiving layer of this original film with a UV filter was 0.08. Further, the transmission density difference between the peeled portion and the non-peeled portion was 0.02.
[0021]
[Example 2]
On a 75 μm thick polyester film (Lumirror T-60, Ra 0.006 μm: Toray Industries, Inc.), a coating solution for a release adjusting layer having the following composition was applied by bar coating, dried to a thickness of about 1 μm. An ink-jet ink receiving layer coating solution was applied on the top by bar coating, and after drying, an ink receiving layer having a thickness of about 20 μm was formed to obtain a printed document film.
[0022]
<Peeling adjustment layer>
・ Cellulose acetate propionate (CAP 482-20: Eastman Kodak Company) 5 parts ・ Methyl ethyl ketone 30 parts ・ Isopropyl alcohol 15 parts [0023]
<Ink receiving layer>
・ Polyvinylpyrrolidone (K-90: GAF) 5 parts ・ Silica (Mizukacil P-78F: Mizusawa Chemical Co.) 0.1 part ・ Water 45 parts
The original film was printed with a monochrome image by an ink jet printer (PM-750C: Seiko Epson), the printed part was cut with a cutter, and the ink receiving layer at that part was peeled off together with the release adjusting layer. Thereafter, when this film was closely baked on a diazo film (Silk Sergia HS: Kimoto Co., Ltd.) and developed, a diazo copy in which the peeled portion was not noticeable was obtained.
[0025]
The transmission density (TD904: Macbeth) of the ink receiving layer of this original film with a UV filter was 0.08. Further, the transmission density difference between the peeled portion and the non-peeled portion was 0.02.
[0026]
【The invention's effect】
According to the film for manuscript of the present invention, by outputting image information such as characters, figures and various data edited on a computer with an ink jet printer, and cutting an unnecessary part with a cutter or the like to peel off, A corrected printed document can be obtained.
Further, according to the original film of the present invention, it is possible to obtain a printed original which can reduce the plate making cost and labor in a series of plate making processes and can be easily corrected.

Claims (1)

After an image is output by an ink jet printer to an ink receiving layer of a film for a printed document in which an ink receiving layer that is receptive to ink for an ink jet printer is provided on at least one surface of the plastic film so as to be peelable from the plastic film A method for correcting a printed original, characterized in that an unnecessary portion of the ink receiving layer is cut and removed.