JPH05303165A - Method for detecting coating defect of photographic layer - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an excellent coating failure detection method for a light-sensitive material for He-Ne laser. A He-Ne laser light-sensitive material, characterized in that at least one of the photographic layers of a He-Ne laser light-sensitive material contains at least one of the following chemical formulas 1 and uses infrared laser light as inspection light. Coating failure detection method. [Chemical 1] Z ₁ and Z ₂ are atomic groups necessary for forming a benzoindolenine ring and a naphthothiazole ring. R ₁ and R ₂ are alkyl groups,
It represents a sulfoalkyl group or a carboxyalkyl group, and has two or more sulfo groups or carboxy groups in the molecule.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating failure detection method for a photosensitive material for He-Ne laser.

[0002]

2. Description of the Related Art Providing users with defect-free and trouble-free photographic products is always a responsibility and a responsibility of the manufacturer. Therefore, various efforts are made to prevent a coating failure, and if a failure should occur, the failure should be found quickly. As a method of detecting such a failure of the photographic light-sensitive material, a method of irradiating the surface of the coating layer with an inspection light in the coating process of the photographic layer and detecting the change of the reflected light is generally known and has been recently excellent. Coating failure detection technology has been developed. For example, JP-A-62-955
As disclosed in Japanese Patent Publication No. 27, a method is known in which light having a wavelength at which the photosensitive layer is not sensitive is used as inspection light, and a non-photosensitive dye having an absorption wavelength corresponding to the wavelength of the inspection light is contained in the photographic layer. is there.

However, in the case of a He-Ne laser light-sensitive material, it is most preferable to use infrared laser light as the inspection light, but it has an absorption wavelength corresponding to the wavelength of infrared laser light and is photochemically inactive ( Since there is no dye which is non-photosensitive and has a good decolorizing property after the development processing, the coating failure of the photosensitive material for He-Ne laser could not be sufficiently detected.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an excellent coating failure detection method for a photosensitive material for He-Ne laser.

[0005]

The above object of the present invention is to apply at least one photographic layer having a photosensitive region to He-Ne laser light to a continuously running support, and irradiate the surface of the photographic layer with inspection light. In the method of detecting coating failure of the photographic layer, at least one compound of Chemical formula 1 is contained in at least one of the photographic layers, and infrared laser light is used as inspection light. Achieved by a material coating failure detection method.

FIG. 2 shows an example of a spectral sensitivity curve of a photosensitive layer which has been color-sensitized to give a He-Ne laser beam a photosensitive region. The wavelength of the He-Ne laser light is 632.8 nm. Therefore, as the inspection light used in the present invention, an infrared laser light is used in which the photosensitive layer of the photosensitive material for He-Ne laser has substantially no sensitivity. Since the infrared laser light has a very narrow oscillation frequency band, it has good monochromaticity and is suitable as an inspection light.

The wavelength of the infrared laser light used in the present invention is 700 nm to 1050 nm, preferably 750 nm.
~ 850 nm. As a detection method, there are a flying image method, a flying spot method, and the like, which can be selected according to the purpose. However, the flying spot method has a larger SN ratio because it detects a defect with one light beam. It has the advantage of high detection accuracy.

The non-sensitizing dye used in the present invention is a compound represented by Chemical formula 1, and typical specific examples are shown below, but the present invention is not limited thereto.

[0009]

[Chemical 2]

[0010]

[Chemical 3]

[0011]

[Chemical 4]

[0012]

[Chemical 5]

[0013]

[Chemical 6]

The layer containing the non-sensitizing dye used in the present invention is a photosensitive layer having a photosensitive region to He-Ne laser light or any non-photosensitive layer such as a protective layer, an intermediate layer or an undercoat layer. At least one layer, and in the present invention, all the constituent layers coated on the support are collectively referred to as a photographic layer.

The content of the non-sensitizing dye used in the present invention in the photographic layer is adjusted so as to be 5% or more, preferably 10% or more of the light absorption rate by the inspection light. Below these values, failure detection capability becomes insufficient. The optimum amount is determined in consideration of the detection power and adverse effects such as the residual color of the dye of Chemical formula 1. It depends on the thickness of the photographic layer and the type of dye,
400 mg / m ^2, preferably in the range from 3 to 100 mg / m ^2.

As the support to which the photographic layer according to the present invention is applied, various ones such as plastic films of polyethylene terephthalate, polycarbonate, polystyrene, polypropylene, double-sided polyethylene coated paper, baryta paper and the like are used.

[0017]

【Example】

Example 1 50 g of a silver halide high-sensitivity emulsion having the following composition and dye-sensitized to have the spectral sensitivity shown in FIG. 2 was added with the content of the exemplary compound (Chemical Formula 2) as a non-sensitizing dye. The silver halide photographic emulsion was prepared by changing the additions. For comparison, a silver halide photographic emulsion containing no non-sensitizing dye was prepared with the same formulation.

<Silver halide emulsion composition> -Gelatin 3.0 g / emulsion 50 g-Silver halide composition: AgI 2 mol%, AgCl
25 mol% and AgBr 73 mol% ・ Average grain size of silver halide grains: 0.4 μm These emulsions were prepared to have a silver amount of 2.0 g / m ² and a gelatin amount of 3.0.
It was coated on a double-sided polyethylene-coated paper at the same time as the gelatin solution for protective layer described below at a coating speed of 100 m / min so as to be g / m ^2, and dried. The protective layer has a gelatin coating amount of 1.
It was applied so as to be 5 g / m ² .

<Gelatin liquid for protective layer> Gelatin 30 g Sodium di-2-ethylhexylsulfosuccinate 1 g Formalin (10% liquid) 5 ml Pure water is added to make 1 liter.

Simultaneously with the coating, a streak-like failure was forcibly generated in the coating surface during the coating process, and a coating failure detection test was conducted using infrared laser light (wavelength 780 nm) as the inspection light.

An infrared laser beam having an intensity of 30 mW is irradiated onto the inspection surface through a spinner having a scanning speed of 2000 rpm, and the diffused reflected light is exchanged for an electric signal by a photo lens and the degree of detection power is evaluated from the SN ratio by an oscilloscope waveform. did. The results are shown in Table 1. The detection evaluations in the table are as follows.

Not detected: S / N ratio of 1 or less Insufficient detection: 〃 1-2 Detection: 〃 2 or more The reflectance of the photographic layer surface of each sample is measured by a spectrophotometer. Was measured.

[0023]

[Table 1]

As is clear from Table 1, sample 1 (comparative) containing no non-sensitizing dye could not detect coating failure at all, but sample 2 of the present invention could detect it though it was insufficient. 3 to 5 could be sufficiently detected. Fogging due to the inspection light did not occur in any of the samples. In addition, Table 2 shows the loss (hue) of the dye after the treatment using the sample of Table 1, and in each case, the loss of the dye is good.

[0025]

[Table 2]

FIG. 1 shows the reflection absorption curve of the photographic layer of Sample 4. The solid line (1) is the absorption curve of the silver halide emulsion layer,
The dotted line (2) is the absorption curve of the non-sensitizing dye used in the present invention, showing that the absorption by the non-sensitizing dye allows detection with infrared laser light (wavelength 780 nm).

FIG. 2 shows the spectral sensitivity curve of Sample 4,
Since it is not sensitive to infrared laser light having a wavelength longer than about 720 nm, it shows that fog due to inspection light does not occur.

[0028]

By using the coating failure detection method of the present invention, the coating failure detection power of the He--Ne laser photosensitive material is improved, and the production process is made more efficient and the quality is improved.

[Brief description of drawings]

FIG. 1 shows a reflection absorption curve of a surface of a photographic layer of Sample 4 in an example.

FIG. 2 shows a spectral sensitivity curve of Sample 4 in an example.

[Explanation of symbols]

 1 Absorption curve of photosensitive layer 2 Absorption curve of non-photosensitive dye 3 Wavelength of infrared laser light

Claims (1)

[Claims] 1. A continuously running support is coated with at least one photographic layer having a photosensitive region for He-Ne laser light,
In a method for detecting coating failure of the photographic layer by irradiating the photographic layer surface with inspection light, at least one of the following chemical formulas 1 is contained in at least one of the photographic layers, and infrared laser light is used as the inspection light. A coating failure detection method for a photosensitive material for He-Ne laser. [Chemical 1] (In the formula, Z ₁ and Z ₂ may be the same or different,
Represents an atomic group necessary for forming a benzoindolenin ring and a naphthothiazole ring. R ₁ and R ₂ represent an alkyl group, a sulfoalkyl group or a carboxyalkyl group, and have two or more sulfo groups or carboxy groups in the molecule. X is an anion, n is 1 or 2, and is 1 when forming an intramolecular salt. )