JPH07181663A - Light-shielding masking film - Google Patents

Abstract

(57) [Abstract] [Purpose] It is easy to obtain a standard for the position to cut the light-shielding release layer, a standard for predicting the cutting direction, etc., and it is possible to reduce cut mistakes and prevent exposure of the photosensitive material. Provided is a light-shielding masking film that does not have any defects. [Structure] A colorless and transparent polyethylene terephthalate film 1 is provided on one side with a blue ink using 175 lines.
A blue ruled line 2 in which lines having a line width of 200 μm are orthogonally crossed in the vertical and horizontal directions at a pitch of 15 mm by a gravure plate having a depth of 30 μm
2, ... Is printed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of handling photosensitive materials, for example, for cutting light rays in the photosensitive wavelength region of photosensitive materials used in photoengraving, the necessary parts are cut,
The present invention relates to a light-shielding masking film used for producing an original image by forming a transparent image by peeling.

[0002]

2. Description of the Related Art Conventionally, in the field of photoengraving, when combining various original images or when synthesizing a part of the original image, as described in, for example, Japanese Patent Laid-Open No. 222222/1990. , A light-shielding masking film to be used for producing a mask by providing a colored peelable film having a light-shielding property on a transparent film support, cutting a required portion, and peeling the required portion along a cut line It is used a lot.

Further, in Japanese Patent Laid-Open No. 63-298247, a light-shielding release layer contains a fluorescent substance, and the cut contour is easily seen by fluorescence emitted from a cross section of a cut portion formed in the light-shielding release layer. A light-shielding masking film made of is also known.

[0004]

In any of the light-shielding masking films described in any of the above publications, it is necessary for a person to be skilled in order to cut along the image while visually observing it. Furthermore, since there is no reference for position such as positioning when cutting, prediction of cutting direction, etc., there is a problem that cutting mistakes that cut larger or smaller than the desired shape are likely to occur and work must be redone. is there.

Further, in the one disclosed in Japanese Patent Laid-Open No. 63-298247, the contour after cutting becomes easy to see, but there is no standard or reference during cutting work, and therefore the same problem as above remains. ing.

The present invention solves the above-mentioned problems of the prior art, makes it easy to obtain a standard for the position where the light-shielding release layer is cut, a prediction of the cutting direction, etc., and it is possible to reduce cut mistakes. An object of the present invention is to provide a light-shielding masking film that does not interfere with the exposure of a light-sensitive material.

[0007]

The light-shielding masking film of the present invention is a light-shielding masking film in which a release layer having a light-shielding property is provided on one surface of a transparent support, and one surface of the transparent support is blue. The ruled line is provided, and the light-shielding release layer is provided on the surface provided with the ruled line or another surface.

The transparent support used in the light-shielding masking film of the present invention is preferably a transparent synthetic resin film of polyethylene terephthalate, polypropylene, polystyrene, polyethylene, polyvinyl chloride or the like. The transparent support having a thickness of 5 to 100 μm is easy to use and practical.

The ruled line provided on one side of the transparent support must be blue. This includes silver salt photographic films whose photosensitive materials are often used in photoengraving processes,
This is because, since it has photosensitivity to near ultraviolet rays and blue light, if it is blue, the ruled lines are not imaged on the photosensitive material.

Examples of the blue coloring material include gravure printing inks and offset printing inks containing the following blue pigments. For example, C.I. I. Pigmen
tBlue 1, C.I. I. Pigment Blue
2, C.I. I. Pigment Blue 15, C.I.
I. Pigment Blue 16, C.I. I. Pig
ment Blue 64 and the like.

To provide the ruled lines, the blue ink is used for printing with a gravure plate, or a blue dye or pigment is added to a photoresist, which is applied to a transparent support, and a ruled line pattern is baked. Photofabrication method and the like can be mentioned. The dye added to the photoresist is C.I. I. Solvent Blue 11, C.I.
I. Solvent Blue 38, C.I. I. Sol
VentBlue 70 etc. are illustrated.

The light-shielding release layer has a sufficient light-shielding property with respect to a light ray having a wavelength that the photosensitive material is exposed to during plate making, and can be easily and completely removed when peeled from the transparent support. At the same time, it is necessary to have a film strength that does not cause breakage. Furthermore, it is also necessary that the non-peeling part of the layer has an appropriate adhesiveness to the support.

The resin used for the light-shielding release layer is a conventionally used thermoplastic resin such as polyvinyl acetate, polyvinyl alcohol, acrylic polymer, polystyrene, styrene-acrylic acid ester copolymer, Polyester such as polyethylene terephthalate and polybutylene terephthalate, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyvinylidene chloride, vinyl chloride-vinylidene chloride copolymer, acrylonitrile-vinylidene chloride copolymer, polyamide, polyurethane, acetyl cellulose Examples thereof include cellulosic polymers such as nitrocellulose, and elastomers such as natural rubber, isoprene rubber, and acrylonitrile-butadiene rubber. These may be used alone or as a mixture of two or more, and it is particularly preferable to use an elastomer and a thermoplastic resin together.

As the colorant used for coloring the light-shielding release layer, oil-soluble dyes and pigments are used to impart light-shielding properties.
The type of color depends on the photosensitive wavelength range of the photosensitive material used, but it is a color that blocks light with a wavelength of 500 nm or less for a light-sensitive material for a bright room and 570 nm or less for a photosensitive material for a dark room. A practical light-shielding property can be obtained.

For this purpose, yellow, orange and red dyes and pigments are used alone or in combination. The content of dyes and pigments in the light-shielding release layer is 10% by weight of the total resin in the light-shielding release layer.
It is about 3 to 15 parts by weight with respect to 0 parts by weight.

The light-shielding release layer may be provided on the surface of the transparent support on which the ruled lines are printed, or on the surface opposite to the ruled lines. When it is provided on the surface opposite to the ruled line, the ruled line comes into close contact with the image when used, so that it is not affected by the thickness of the transparent support and the cutting operation can be performed at a more accurate position, which is preferable.

The arrangement of the blue ruled lines and the intervals between the lines are those in which a large number of parallel straight lines are fixed or are orthogonal to each other in the vertical and horizontal directions at appropriate intervals, those which are crossed in an oblique direction instead of being orthogonal, circular, elliptical, triangular. It may be appropriately selected in accordance with the target image, such as those intersecting from three directions so as to form the image.

The line width of the ruled line is not particularly limited, but is preferably 200 to 400 μm.
Further, the blue portion of the ruled line preferably has a total light transmittance of 5 to 80%. If it is less than 5%, the blue density is high, so
The image of the blue ruled line was reflected on the photosensitive material in the part where the light-shielding release layer was peeled off and could not be practically used, and when it exceeded 80%, the blue density was low and it was difficult to confirm when visually observed through the release layer, which served as an aid to the cutting work. Absent.

By adding a conventionally known ultraviolet absorber, for example, salicylic acid ester-based, benzotriazole-based or benzophenone-based one to the light-shielding release layer, the light-shielding property can be further improved. The amount of such an ultraviolet absorber added is preferably 0.05 to 1 part by weight with respect to 1 part by weight of the dye or pigment used.

In order to form a light-shielding release layer on a transparent support, a solution prepared by mixing the above resin with a dye / pigment and an ultraviolet absorber and dissolving this in an organic solvent such as methyl ethyl ketone, toluene, xylene, etc. is conventionally used. It may be formed by applying a known coating means such as a knife coater or a comma coater to a predetermined thickness and then drying. The thickness of the release layer is preferably about 1 to 25 μm after drying.

[0021]

[Function] Since a blue ruled line is provided on the surface of the transparent support, the ruled line can be easily confirmed by the human eye, and cut mistakes can be avoided by using it as a reference for the cut position, prediction of the cutting direction, etc. It is possible to perform the cutting work easily and efficiently without skill.

The blue ruled line does not appear as an image because it is exposed to the photosensitive material. This is because the photosensitive material is sensitive to near-ultraviolet rays and blue light, including silver salt photographic film that is often used in the photoengraving process, so if it is blue, ruled lines will not appear as an image on the photosensitive material. This is because.

[0023]

EXAMPLES Examples of the light-shielding masking film of the present invention will now be described with reference to the drawings. 1 is a plan view showing an embodiment of the light-shielding masking film of the present invention, and FIG. 2 is a sectional view taken along line AA of FIG. 1 is a colorless and transparent polyethylene terephthalate film (trade name: T100, thickness 100 μm, manufactured by Diafoil Hoechst), and blue ink (trade name: Lamic F220-739 Ai, manufactured by Dainichiseika Co., Ltd.) is used on one side of this transparent film. The number of lines is 17
5 lines, line width 200μm by gravure plate with depth 30μm
Are printed with blue ruled lines 2, 2, ...

Ruled lines 2, 2, ... Of the transparent film 1
The light-shielding release layer 3 is laminated on the surface opposite to the printing surface. The light-shielding release layer 3 is formed as follows. In advance, vinyl chloride-vinyl acetate copolymer (trade name: Vinylite VYHH manufactured by Union Carbide Co.) 1
00 parts by weight, nitrile rubber (product name: manufactured by Nippon Zeon Co., Ltd .:
Nipporan 1432J) 30 parts by weight, red oil-soluble dye (Hodogaya Chemical Co., Ltd. product name: Spiron Red GEH) 5
A coating solution was prepared by uniformly dissolving 1 part by weight of orange oil-soluble dye (Zabone Orange 272 manufactured by BASF) in methyl ethyl ketone.

Light-shielding property is obtained by coating and drying the above coating solution using a knife coater on the ruled lines 2, 2, ... On the side opposite to the printing surface of the transparent film 1 so that the thickness after drying is about 20 μm. The release layer 3 was formed to obtain a light-shielding masking film.

As a result of measuring the spectral transmittance of the obtained light-shielding masking film, light rays having a wavelength of 580 nm or less were shielded. Also, the light-shielding release layer 3 of this light-shielding masking film is placed on the light table,
When visually observed from the light-shielding release layer 3 side, the ruled lines 2, 2, ... After that, when the light-shielding peeling layer 3 is cut with a cutter blade, the ruled lines 2, 2, ... serve as a guide for the cutting position and a reference for predicting the cutting direction, and the cutting work is extremely easy and efficient. I was able to.

Further, a part of the release layer 3 is peeled off from the transparent film 1 to expose the transparent film, and the blue ruled lines 2, 2, ...
The total light transmittance of .. was 8%.

Further, a printing test on a silver salt photographic film was conducted as follows. Light-shielding release layer 10 cm x 10
A piece having a transparent film exposed by cutting was prepared by cutting into a size of cm and peeling. Fuji Photo Film Co., Ltd., trade name "Fujiris Ortho Film RO-1"
00 ", the emulsion surface and the light-shielding release layer surface were opposed to each other and vacuum-contacted with a baking exposure machine, followed by exposure with a tungsten light source at an exposure surface illuminance of 4 lux for 20 seconds and reversal of baking.

As a result, the part where the peeling layer was peeled off was exposed to light, including the blue ruled lines, and was completely blackened, but the part where the peeling layer was left was completely shielded from light.

[0030]

EFFECTS OF THE INVENTION The light-shielding masking film of the present invention has the above-mentioned constitution, and since the transparent support is provided with blue ruled lines, when the light-shielding release layer is cut, the standard of the cutting position, the prediction of the cutting direction, etc. As a reference, it is possible to prevent a cutting mistake in which the cutting position is wrong, and the cutting work can be performed easily and efficiently. Further, the ruled lines do not interfere with the exposure of the photosensitive material, and the image of the ruled lines does not appear on the photosensitive material.

[0031]

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the light-shielding masking film of the present invention.

FIG. 2 is a partial cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 1: Transparent film 2: Ruled line 3: Light-shielding release layer

Claims (1)

[Claims] 1. A light-shielding masking film comprising a transparent support and a release layer having a light-shielding property provided on one surface of the transparent support, wherein one surface of the transparent support is provided with blue ruled lines, and the surface having the ruled lines is provided. Alternatively, a light-shielding masking film having a light-shielding release layer provided on the other surface.