JP2001100388A - Photographic print producing method and device for cutting photographic sensitive material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the stacking properties of a high-stiffness photographic sensitive material. SOLUTION: The reflection supporting body of high-stiffness photographic sensitive material is constituted by covering at least an image recording side with a composition obtained by mixing and dispersing 50 wt.% or more white pigment in resin including polyester synthesized from dicalboxylic acid and a diol by condensation polymerization. By using this reflection supporting body, a silver halide photographic sensitive material 10 is produced. Then the four corners 10a of the material 10 or a photographic print obtained by recording an image on the material 10 are cut round. Since burr is not caused at the corner parts 10a of the high-stiffness material 10 by cutting the corner parts 10a round, the stacking properties are enhanced. Besides, since the corner parts 10a of the high-stiffness material 10 do not become pointed, a hand is not pricked with them.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a photographic print which has good resistance to deformation and bending, and which is not easily disintegrated even when several tens of papers are stacked, and to a photographic photosensitive material cutting apparatus.

[0002]

2. Description of the Related Art Conventionally, the toughness of image display materials has been pursued with a silver halide photographic light-sensitive material at the top. The image display material is a material that displays an image including a picture, a character, a figure, etc. in addition to a photograph on a support made of paper or plastics. Until now, the development of toughness has been mainly performed from the viewpoint of image storability, but in recent years, the viewpoint of toughness against physical destruction such as deformation, bending, or cracking has become important. Especially in silver halide photographic light-sensitive materials, as a result of technological development up to now, image storability has been able to withstand appreciation for several decades under normal storage conditions, such as thumb tacks and walls with adhesive tape. It has become important to withstand physical destruction, such as sticking to paper, bending due to wind or repeated sticking.

As a result of studies by the present inventors for the purpose of preventing physical destruction, as a result, a support in which a base paper is coated with a resin containing a polyester as a main component described in JP-A-6-167775 or the like to increase rigidity is used. Has been shown to have several times the physical strength of a conventional photographic print consisting of a polyethylene-coated paper support. On the other hand, it has been found that the same effect can be obtained by the method disclosed in British Patent GB-2325750 for obtaining a photographic print having resistance to cracks due to deformation and bending.

[0004]

However, photographic prints using a support whose physical strength has been increased according to these methods cannot be printed when continuous printing is performed using an automatic developing machine and an automatic cutting machine. It has been found that when the number of sheets reaches several thousand, the shape of a corner that should be a normal angle is not a right angle, and tends to be a shape having sharp burrs. When such burrs are present, when several hundred photo prints are stacked in a stack, they tend to collapse without being stacked vertically.
Therefore, it is not preferable because the integration property is inferior and the work load in the developing station increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a high resistance to deformation and bending, and a method for producing a photographic print so as not to collapse even when several tens of sheets are stacked. It is intended to provide a device.

[0006]

According to a first aspect of the present invention, there is provided a method for producing a photographic print, wherein the reflective support of the silver halide photographic light-sensitive material used for the photographic print is a polyester synthesized by polycondensation from a dicarboxylic acid and a diol. At least on the image recording side of a resin containing 50% by weight or more of a resin mixed with a white pigment, and an image was recorded on the silver halide photographic material or on the silver halide photographic material. In the photographic print, both the rear end corner and the next front end corner are simultaneously round cut or chamfered.

In the photographic print producing method according to the present invention, the reflection support of the silver halide photographic light-sensitive material used for the photographic print has a biaxially stretched polyolefin layer having at least one micropore, In the silver halide photographic material or a photographic print on which an image has been recorded on the silver halide photographic material, both the rear corner and the next front corner are simultaneously round cut or chamfered.

It is preferable that the round cut or the chamfer cut is performed simultaneously when the silver halide light-sensitive material or a photographic print having an image recorded on the silver halide light-sensitive material is cut into a rectangular sheet. Also,
The round cut or chamfer cut is preferably performed after the silver halide light-sensitive material or a photographic print in which an image is recorded on the silver halide light-sensitive material is cut into a rectangular sheet.

According to a third aspect of the present invention, there is provided an apparatus for cutting a photographic light-sensitive material, wherein the first cutter cuts the photographic light-sensitive material in a width direction and cuts it into rectangular sheets, and is disposed at a position facing both side edges of the photographic light-sensitive material in the width direction. And a second cutter for cutting both corners at the rear end of the rectangular sheet cut by the first cutter, and both corners at the front end of the next photographic photosensitive material, and a rectangular sheet cut by the first cutter and Means for feeding the photosensitive material to the second cutter. Note that the second
Preferably, the cutter comprises a right cutter body, a left cutter body, and a moving means for moving these cutter bodies in accordance with the width of the photosensitive material.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The reflective support of a photographic light-sensitive material according to the present invention comprises a composition obtained by mixing and dispersing a white pigment in a resin containing 50% by weight or more of polyester at least on the emulsion-coated side of a substrate (preferably base paper). Image recording side) The surface is coated. This polyester is a polyester synthesized by polycondensation from a dicarboxylic acid and a diol. Preferred dicarboxylic acids include terephthalic acid, isophthalic acid, and naphthalenedicarboxylic acid. Preferred diols include ethylene glycol, butylene glycol, neopentyl glycol, triethylene glycol, butanediol, hexylene glycol, bisphenol A ethylene oxide adduct (2,2-bis (4- (2-hydroxyethyloxy)
Phenyl) propane, 1,4-dihydroxymethylcyclohexane and the like.

Various polyesters obtained by polycondensation of a dicarboxylic acid alone or a mixture thereof and a diol alone or a mixture thereof can be used. Among them, at least one of the dicarboxylic acids is preferably terephthalic acid. The dicarboxylic acid component is a mixture of terephthalic acid and isophthalic acid (molar ratio: 9: 1 to 2:
8) or a mixture of terephthalic acid and naphthalenedicarboxylic acid (molar ratio 9: 1 to 2: 8) is also preferably used. As the diol, it is preferable to use ethylene glycol or a mixed diol containing ethylene glycol. The molecular weight of these polymers is 30,000-
Preferably it is 50,000.

It is also preferable to use a mixture of a plurality of polyesters having different compositions. Further, mixtures of these polyesters with other resins can also be preferably used. Other resins to be mixed include polyolefins such as polyethylene and polypropylene, polyethers such as polyethylene glycol, polyoxymethylene, and polyoxypropylene, polyester-based polyurethane, polyether polyurethane, polycarbonate, polystyrene, and the like. A wide variety of resins extrudable at ° C can be selected. These resins may be used alone or in combination of two or more. For example, 6% by weight of polyethylene and 4% by weight of polypropylene can be mixed with 90% by weight of polyethylene terephthalate. The mixing ratio of the polyester and the other resin differs depending on the type of the resin to be mixed.
Other resins = 100/0 to 80/20 are appropriate. If it exceeds this range, the physical properties of the mixed resin will be sharply reduced. In the case of resins other than polyolefin, the weight ratio of polyester /
Other resins can be mixed in the range of 100/0 to 50/50. If the polyester is less than 50% by weight,
Sufficient resistance to deformation and bending cannot be obtained.

Examples of white pigments mixed and dispersed in the polyester of the reflection support include titanium oxide, barium sulfate, lithopone, aluminum oxide, calcium carbonate, silicon oxide, antimony trioxide, titanium phosphate, zinc oxide, lead white, zirconium oxide and the like. Examples include inorganic pigments and organic fine powders such as polystyrene and styrene-divinylbenzene copolymer. Among these pigments, the use of titanium dioxide is particularly effective. Titanium dioxide may be any of rutile type and anatase type, and may be manufactured by any of a sulfate method and a chloride method. A specific product name is KA-
10, KA-20, A-220 manufactured by Ishihara Sangyo, and the like.

The average particle size of the white pigment used is 0.1 to 0.1.
8 μm is preferred. If it is less than 0.1 μm, it may be difficult to uniformly mix and disperse the resin, which is not preferable. If it exceeds 0.8 μm, sufficient whiteness cannot be obtained, and projections may be formed on the coated surface, which may adversely affect the image quality.
The mixing ratio of the white pigment to the polyester is 98/2 to 30/70 (polyester / white pigment) by weight ratio,
Preferably 95/5 to 50/50, particularly preferably 90
/ 10 to 60/40. When the content of the white pigment is less than 2% by weight, the contribution to the whiteness is insufficient, and when it exceeds 70% by weight, the surface smoothness when used as a support for photographic printing paper is insufficient, and the glossiness is excellent. May not be obtained. The above polyester and white pigment are mixed together with a dispersing agent such as a metal salt of a higher fatty acid, a higher fatty acid ethyl, a higher fatty acid amide, or a higher fatty acid, using a kneading machine such as a two-roll, three-roll, kneader, or Banbury mixer. Is kneaded into the resin. An antioxidant can be contained in the resin layer, and the content can be added in the range of 50 to 1,000 ppm based on the resin.

The thickness of the polyester / white pigment composition coated on the emulsion support side of the base of the reflective support is from 25 to 10
It is preferably 0 μm, more preferably 30 to 80 μm, and still more preferably 40 to 75 μm. If the thickness is more than 100 μm, there may be problems in physical properties such as emphasizing the brittleness of the resin and causing cracks. If the thickness is less than 25 μm, the material may be too soft in physical properties. The thickness of the resin or the resin composition to be coated on the surface other than the emulsion-coated side of the substrate is preferably from 5 to 100 μm, more preferably from 10 to 50 μm. If the thickness exceeds this range, problems in physical properties, such as the occurrence of cracks due to emphasis on the brittleness of the resin, may occur. If the ratio is less than this range, the waterproof property, which is the original purpose of the coating, may be impaired and the physical properties may be too soft. Examples of a method for coating the coating layer on the emulsion-coated side and the back surface layer of the substrate include a melt extrusion lamination method.

The substrate used for the reflective support is selected from materials generally used for photographic paper. So,
Natural pulp selected from softwood, hardwood, etc., synthetic pulp as the main raw material, if necessary, clay, talc, calcium carbonate, urea resin fine particles, rosin, alkyl ketene dimer, higher fatty acid, epoxidized fatty acid amide ,
Paraffin wax, sizing agents such as alkenyl succinic acid, starch, polyamide polyamine epichlorohydrin,
What added the paper strength enhancer, such as polyacrylamide, and the fixing agent, such as a sulfuric acid band and a cationic polymer, is used. As the substrate used for the reflective support, base paper made of the above-mentioned natural pulp or synthetic pulp as a main raw material is preferable. The type and thickness of the substrate is not particularly limited, the basis ^{weight, 50g / m 2 ~250g / m} 2 is desirable. For the purpose of imparting smoothness and flatness, the substrate is preferably subjected to surface treatment by applying heat and pressure using a machine calender, a spar calender, or the like.

This "smoothness" is expressed using the surface roughness of the support as a scale. The surface roughness of the support of the present invention will be described. As the surface roughness, the center line average surface roughness is used as this scale. The center line average surface roughness is defined as follows. From the roughness surface, a portion of the area SM is extracted on the center plane, the orthogonal coordinate axes, the X axis, and the Y axis are set on the center line of the extracted portion, and the axis orthogonal to the center line is set as the Z axis. Is defined as the center line average surface roughness SRa and is expressed in μm.

[0018]

(Equation 1)

The values of the center line average surface roughness and the height of the protrusion from the center line can be determined, for example, using a three-dimensional surface roughness measuring instrument (SE-30H) manufactured by Kosaka Laboratory Co., Ltd. 5 mm with a cutoff value of 0.8 mm, a magnification of 20 times in the horizontal direction, and a magnification of 2000 times in the height direction
It can be determined by measuring the area of m ² . Further, the feeding speed of the measuring needle at this time is preferably about 0.5 mm / sec. The support obtained by this measurement preferably has a value of 0.15 μm or less, more preferably 0.10 μm or less.
By using a support having such a surface roughness (smoothness), a color print having a surface with excellent smoothness can be obtained.

When the substrate is coated with the above-mentioned polyester / white pigment mixture composition, it is preferable that the surface of the substrate is preliminarily subjected to a pretreatment such as a corona discharge treatment, a flame treatment, and an undercoating.

When a polyester such as polyethylene terephthalate is used, the adhesion to a photographic emulsion is weaker than that of polyethylene. Therefore, after the polyester is melt-extruded and laminated on a substrate, the polyester surface is subjected to corona discharge treatment to form a hydrophilic colloid layer. It is preferable to coat.
It is also preferable to coat an undercoating liquid containing a compound represented by the following general formula [U] on the surface of a thermoplastic resin mainly composed of polyester.

[0022]

Embedded image

The amount of the compound represented by the general formula [U] is preferably 0.1 mg / m ² or more, and more preferably 1 m / m ^2.
g / m ² or more, most preferably 3 mg / m ² or more. The more the amount, the more the adhesion can be strengthened. However, excessive use is disadvantageous in cost. Further, it is preferable to add alcohols such as methanol to improve the suitability of applying the undercoat liquid to the resin surface. In this case, the proportion of alcohols is preferably at least 20% by weight, more preferably at least 40% by weight, and most preferably at least 60% by weight. Further, in order to further improve the coating suitability, it is preferable to use various surfactants such as anionic, cationic, amphoteric, nonionic, fluorocarbon, and organosilicon type.

It is preferable to add a water-soluble polymer such as gelatin to obtain a good undercoating surface. Considering the stability of the compound of the general formula [U], the pH of the solution is pH 4
To pH 11 is preferable, and more preferably, pH 5 to pH 11.
It is 10. It is preferable that the surface of the thermoplastic resin is surface-treated before applying the undercoat liquid. As the surface treatment,
Corona discharge treatment, flame treatment, plasma treatment, or the like can be used. When applying the undercoat liquid, a gravure coater, a bar coater, a dip coating method, an air knife coating method, a curtain coating method, a roller coating method,
The coating can be performed by a generally well-known coating method such as a doctor coating method or an extrusion coating method. The drying speed of the coating is preferably 30 ° C to 100 ° C, more preferably 50 ° C to 100 ° C, and most preferably 70 ° C to 100 ° C, and the upper limit is from the heat resistance of the resin.
The lower limit is determined by the production efficiency.

Another aspect of the highly rigid reflective support is:
The following are mentioned. That is, it is a water-resistant resin-coated reflective support in which at least one of the water-resistant resin layers between the support and the silver halide emulsion layer is a biaxially stretched polyolefin layer having micropores. The details will be described below.

As a method of forming micropores in the polyolefin, a method is used in which a substance serving as a nucleus having a low affinity for the polymer is added to the polyolefin, and the resultant is stretched to form pores around the nucleation substance. Is preferred. The substance serving as a nucleus of the vacancy is called a vacancy inducing substance, and an inorganic pigment or a polymer material can be used, but a polymer material is preferably used.

As the polymer material, a polymer which can be melt-mixed with a polymer forming a core matrix and which can form dispersed spherical particles when the suspension is cooled is preferred.
An example is polybutylene terephthalate dispersed in polypropylene. It is preferable to use 5 to 50% by weight of the pore inducing substance based on the matrix polymer of the core. The pore-inducing material particles remaining in the finished sheet core have a diameter of 0.1 to 10 μm and are preferably spherical. The size of the pores depends on the degree of stretching in the vertical and horizontal directions, but is approximately the cross-sectional diameter of the particles that form the pores.

The polyolefin layer having micropores can form a polyolefin layer containing no micropores adjacent to the layer. The polyolefin layer having micropores is opaque and milky white by itself, but a white pigment such as titanium dioxide, barium sulfate, alumina, or calcium carbonate is added to the micropore-containing layer and / or the adjacent polyolefin layer to obtain a white color. The degree can be improved. In addition, known additives such as pigments, fluorescent whitening agents, and other additives for improving the properties of the polyolefin layer can also be added. In particular, when polypropylene is used, the packing density of titanium oxide or the like can be increased, which is preferable from the viewpoint of improving whiteness. The density of these one or more polyolefin layers is preferably 0.40 to 1.0 g / cc,
0.50 to 0.70 g / cc is more preferred.

As a preferred embodiment of the present invention, a unit having a sandwich structure having a polypropylene skin layer containing titanium oxide and containing no micropores is provided on both sides of a core layer of polypropylene containing no titanium oxide and having micropores. No. In this sandwich structure, the thickness of the core layer is preferably 5 to 150 μm, more preferably 10 to 70 μm, and the thickness of the skin layer is 1 to 50 μm.
m, more preferably 3 to 20 μm.

Further, in order to improve the adhesion between the hydrophilic photographic constituent layer and the support, the fine porosity-containing polyolefin layer and the hydrophilic photographic constituent layer are interposed between the hydrophilic photographic constituent layer and the fine porosity. It is preferable to provide a polyolefin layer having no pores. The thickness of the polyolefin layer having no micropores is preferably 0.1 to 5 μm. In a particularly preferred embodiment, the polyolefin layer having micropores is preferably mainly composed of polypropylene, and the polyolefin having no micropores is preferably polyethylene. Further, it is more preferable that the polyolefin layer having no micropores is subjected to corona discharge treatment.

It is also preferable to provide a biaxially stretched polyolefin layer on the side of the support opposite to the emulsion surface from the viewpoint of increasing the rigidity of the reflective support. In this case, the surface of the polyolefin layer on the back surface is preferably made of matte-finished polyethylene or polypropylene containing silica. Also, as described in JP-A-11-65024, two or more layers of polypropylene on the back surface may be provided, and printing may be performed on the first polyolefin. The thickness of the polyolefin layer on the back side is preferably 5 to 100 μm, more preferably 10 to 100 μm.
７０70 μm.

The support which can be preferably used in the present invention is a polymer support, a synthetic paper support, a cloth support, a woven polymer fiber support, a cellulose fiber paper support, or a laminate thereof. Particularly preferably,
This is a photographic brand cellulose fiber paper having a base paper pH of 5 to 9 described in JP-A-6-167771.

It is preferable to adjust the thickness and rigidity so as to meet various consumer requirements. For example, for these purposes, 2800 MPa in the vertical direction
Young's modulus of ~ 13000MPa and 1400MPa ~ 7
On both sides of a paper support having a Young's modulus of 000 MPa, a laminated support having a biaxially stretched sheet having a Young's modulus of 690 MPa to 5520 MPa in the longitudinal direction and a Young's modulus of 690 MPa to 5520 MPa in the transverse direction is prepared.
A bending stiffness of 150 to 250 millinewtons can also be achieved with a thickness of 0.2 to 0.28 mm.

The preferred embodiments of the above-mentioned support in the present invention are described in JP-A-10-333277 and JP-A-10-333277.
-333278, JP-A-11-52513, JP-A-11-65024, EP-08880065A1, E
P-0888066A1, US-5,888,681
No. 5,888,714 and British Patent No. 232
No. 5749.

Next, the shape of the four corners of the silver halide photographic light-sensitive material of the present invention will be described. As shown in FIG. 1, a silver halide photographic light-sensitive material 10 of the present invention is cut into a rectangle, and the shape of four corners 10a is an arc having a radius R1 = 8 mm centered in the rectangle. The shape of the corner 10a may not be a complete arc. For example,
It may be a part of an ellipse or a part of a polygon close to an arc,
Any purpose may be used so as to substantially round the corners. In the case of an arc, a preferable range of the radius R1 is 2 mm to 15 mm, most preferably 3 mm to 1 mm.
0 mm or less. The photographic material 10 may be cut into a square in addition to the rectangular shape. Further, instead of the round cut, a chamfer in which a corner is cut off obliquely may be performed.

The corner 10a is formed into a circular arc shape by round cutting with a die set type paper cutter 12 as shown in FIG. The round cut is
It may be performed at any time after printing immediately after the application of each photosensitive layer and after printing. For example, for the photographic light-sensitive material 10 wound up and stored in a roll shape, for example, after printing exposure and development processing, the margin between each image is cut off, and the cut sheet 1 is cut.
Performed when disconnecting as 1. In this case, as shown in FIG. 2, a cut mark composed of a small hole or the like is formed at the edge of the photographic photosensitive material 10 at the time of printing exposure, and after the development processing, the cut mark is detected, and Then, the paper cutter 12 separates the paper. Further, before the printing exposure, the film may be round-cut, cut into a cut sheet, and subjected to printing exposure and development processing. Further, in the production process of the photographic light-sensitive material, round cutting may be performed when cutting as a cut sheet type product.

FIG. 2 is a schematic view of the paper cutter 12. The paper cutter 12 includes a fixed blade 15, a movable blade 16, a blade driving unit 17, and a pair of paper feed rollers 18, 19. The blade driving unit 17 raises and lowers the movable blade 16, and the fixed blade 15 moves down. The photographic light-sensitive material 10 is round-cut between 15 and 15. The movable blade 16 has an I-shaped cross section. The corners 10a at both ends of the photographic material 10 are round-cut by the arcuate blades 15a and 16a at both ends of the fixed blade 15 and the movable blade 16.

The paper feed roller pairs 18 and 19 are driven to rotate by a feed motor 20. The rotation of the feed motor 20 is controlled by a controller 21. Controller 21
Controls the rotation of the feed motor 20 based on the cut mark detection signal of the photographic photosensitive material 10 from the mark sensor 22 to position the photographic photosensitive material 10 on the paper cutter 12. The cut mark 10b is composed of a small hole formed by a puncher (not shown). The portion including the cut mark 10b is discarded as chips during round cutting.

FIG. 3 is a schematic view of a paper cutter according to another embodiment, and FIG. 4 is an external view of each cutter. In this paper cutter 30, first to third pairs of paper feed rollers 31, 32, and 33, a first cutter 34 of a shear cut system, and a second cutter 35 of a die set system are used as shown in FIG. First, the first cutter 34
Then, the photosensitive material 10 is cut into cut sheets 40, and then the rear end of the preceding cut sheet 40 and the front end of the subsequent cut sheet 40 are round-cut by the second cutter 35, and four arc-shaped corners 10a are formed. To form

As shown in FIGS. 3 and 4, the first cutter 3
4 and the second cutter 35, which are separated and round-cut, so that the paper cutter 12 shown in FIG.
As compared with the above, the load at the time of cutting can be reduced, the size of the drive motor can be reduced, and the durability of the blade can be improved. That is, in the case of a high-strength photographic light-sensitive material coated with polyester or the like as compared with the conventional photographic light-sensitive material coated with polyethylene, round cutting and cutting into cut sheets are performed simultaneously as in the paper cutter 12 shown in FIG. Increases the load. Therefore, there are drawbacks that the drive motor becomes large and the life of the blade is shortened. However, these can be improved by the paper cutter 30 shown in FIGS.

First to third paper feed roller pairs 31 to 31
The rotation of 33 is controlled by a feed motor 36. Also,
The first and second paper feed roller pairs 31, 32 are provided with electromagnetic clutch brakes 37, 38, and the drive transmission of the motor 36 is cut off as required. These motor 36 and electromagnetic clutch brake 3
7 and 38 are controlled by a controller 41 via drivers 36a, 37a and 38a.

The first cutter 34 includes a fixed blade 42 and a movable blade 4.
3 and a blade drive unit 44, which are arranged along the width direction of the photographic light-sensitive material 10. The movable blade 43 is moved up and down by a blade driving unit 44. Blade drive unit 44
Is composed of a well-known lifting device.

The second cutter 35 has a female fixed blade 45 disposed on the lower side and a male movable blade 46 disposed on the upper side.
And a blade drive unit 47. As shown in FIG. 4, the movable blade 46 is formed of a substantially isosceles triangular block when viewed from above, and the equilateral part is an arc-shaped blade body 46a that is concave inward. The fixed blade 45 has a female shape corresponding to the movable blade 46,
By the fixed blade 45 and the movable blade 46, both ends 10a of the photographic material 10 and the cut sheet 40 are round-cut. Although the fixed blade 45 and the movable blade 46 are divided into two in the width direction of the photographic light-sensitive material 10, they may be formed integrally.

As shown in FIG. 3, a cut mark sensor (first sensor) 51 is arranged near the first cutter 34. The first sensor 51 detects a cut mark 10b (see FIG. 4) formed on one side edge of the photographic photosensitive material 10. This cut mark detection signal is sent to the controller 41. Further, a rear end sensor (second sensor) 52 is arranged near the second cutter 35. The second sensor 52 detects the rear end of the cut sheet 40 separated by the first cutter 34 and sends a detection signal to the controller 41. The controller 41 includes first and second
Each unit is controlled based on the detection signals of the sensors 51 and 52.

FIG. 6 is a flowchart showing a processing procedure in the controller 41. At the first cut,
The planned cutting line is positioned on the first cutter 34 based on the cut mark 10b, and the leading end margin (not shown) is cut off. Next, the feed motor 36 is driven, and the leading edge margin and the succeeding photographic photosensitive material 10 are fed by the respective feed roller pairs 31 to 33. Then, on the basis of the cut mark detection signal of the first sensor 51, the subsequent cut line of the photosensitive material 10 is positioned on the first cutter 34.

The second sensor 52 detects the preceding photographic light-sensitive material 10, for example, the rear end of the front margin, and the front margin is positioned on the second cutter 35 based on this.
When the photographic photosensitive material 10 is positioned on the first cutter 34 by the first sensor 51, the leading end of the photographic photosensitive material 10 is simultaneously positioned on the second cutter 35. When the positioning is completed, the feed motor 36 stops, and thereafter, the second and first cutters 35 and 34 operate in order. Thus, in the second cutter 35, both corners at the rear end of the preceding photosensitive material (cut sheet 40) and both corners at the leading end of the succeeding photosensitive material 10 are round-cut. In the first cutter 34, the photosensitive material 10 is cut off as a cut sheet 40.

At the end of the cutting operation, the succeeding photographic light-sensitive material 10 is not fed to the second cutter 35.
Only a is round-cut.

FIG. 7 shows another embodiment in which the width of the photographic material 10 can be changed. In this case,
By shifting the right cutter body 61 and the left cutter body 62 of the second cutter 60 toward and away from each other by the shift mechanism 63, the width of the photosensitive material 10 can be changed. Each of the cutter bodies 61 and 62 is movable in the width direction of the photosensitive material 10 by a guide mechanism (not shown). The shift mechanism 63 includes female screw portions 65 and 66 attached to the cutter main bodies 61 and 62, a male screw portion 67 screwed to the female screw portions 65 and 66, and a motor 68 for rotating the male screw portion 67. . The male screw portion 67 has its screw direction changed at the center, and when it rotates to one side, the cutter bodies 61 and 62 separate, and when it rotates to the other side, the cutter bodies 61 and 62 approach. The shift mechanism 63 may be any mechanism that can move the cutter bodies 61 and 62 toward and away from each other, and a rack-and-pinion mechanism, other link mechanisms, and the like are used in addition to the screw mechanism. According to the present embodiment, when the width signal of the photographic material 10 is input, the male screw portion 67 is rotated based on the signal, and the cutter bodies 61 and 62 are set at positions corresponding to the width of the photographic material 10. Is done.

In the above embodiment, the first cutter 34
The cut sheet 40 cut by the second feed roller pair 3
When the sheet 2 is fed, the sheet is fed slightly larger than the feed amount of the first feed roller pair 31 to provide a predetermined gap between the cut sheet 40 and the succeeding photographic photosensitive material 10. This change in feed amount is controlled by changing the rotation time,
In addition, the rotation speed of each paper feed roller pair may be changed. Further, when changing the feed amount, when a pulse motor is used, the number of drive pulses may be changed.

Next, a sample for demonstrating the effect of the present embodiment will be described. Example 1 [Preparation of cellulose paper support] Bleached hardwood kraft 5
Pulp furnish consisting of 0% bleached hardwood sulphite 25% and bleached softwood sulphite is passed through a double disc refiner and then a Jordan conical refiner to a 200 cc Canadian standard freeness.
(Photograph paper support). To the obtained pulp furnish, on a dry basis, 0.4% of alkyl ketene dimer, 1.0% of cationic corn starch, and 0.1% of polyamide epichlorohydrin.
5% anionic polyacrylamide 0.26%, and a TiO ₂ 5.0% were added. Sheffield porosity and apparent density 0.70 g / 160 Sheffield units
The paper base pressed to cc was surface glued with a 10% hydroxyethylated corn starch solution using a vertical size press to achieve a starch loading of 3.3% by weight. The surface-glued support was calendered to an apparent density of 1.04 g / cc to obtain a 145 μm thick cellulose paper support. After forming a polymer layer having the following composition on the paper support and subjecting the emulsion side to a corona discharge treatment, the undercoat was applied to form the following reflective supports A, B, C, D, B2, C2 and D2. Produced. The polymer layer on the emulsion side contained 4,4'-bis (5-methylbenzoxazolyl) stilbene at 10 mg / m ² and ultramarine.

Preparation of Reflection Support A Emulsion side polymer composition: polyethylene layer (35%) containing 20% by weight of titanium oxide
μm) Back side polymer composition: polyethylene layer (30 μm)

Preparation of reflective support B Emulsion surface side polymer composition: polyethylene terephthalate layer containing titanium oxide at 20% by weight (35 μm) Back surface polymer composition: polyethylene layer (30 μm)

Preparation of Reflection Support C Emulsion Surface Side Polymer Composition: From the emulsion side, a polyethylene layer containing no micropores (1 μm) A polypropylene skin layer containing titanium oxide and containing no micropores (4 μm) Polypropylene core layer containing pores (22 μm) Polypropylene skin layer containing titanium oxide and not containing micropores (4 μm) Polyethylene layer containing titanium oxide and containing no pores (4 μm) Back surface polymer composition: polyethylene Layer (30 μm)

Preparation of reflective support D Emulsion surface polymer composition: From the emulsion side, a polyethylene layer containing no micropores (3 μm) A polypropylene layer containing titanium oxide and containing micropores (7 μm) Polypropylene layer not containing (9 μm) Polypropylene layer containing titanium oxide and containing micropores (7 μm) Polyethylene layer containing titanium oxide and not containing micropores (4 μm) Backside polymer composition: polyethylene layer (30 μm)

Preparation of Reflective Support B2 Emulsion-side polymer composition: Same as reflective support B Back-side polymer composition: Polyethylene layer (28 μm) from support side Silica-containing polyethylene layer (2 μm)

Preparation of reflective support C2 Emulsion surface side polymer composition: Same as reflective support C Back surface polymer composition: Polyethylene layer (9 μm) Polypropylene layer (24 μm) Silica-containing polyethylene layer (3 μm)

Preparation of reflective support D2 Emulsion surface polymer composition: Same as reflective support D Back surface polymer composition: polyethylene layer (6 μm) polypropylene layer (27 μm) silica-containing polyethylene layer (3 μm)

Table 1 below shows the Taber stiffness of each of the obtained reflective supports A to D2 in two directions.

[0059]

[Table 1]

In the present invention, the stiffness of the support is defined by a Taber stiffness meter according to JIS P-8.
125 means the value measured by the method described in The stiffness of the support is a value measured after removing the coated photographic constituent layer or before coating the photographic constituent layer. In the present invention,
The stiffness is measured in two directions, a papermaking direction and a direction perpendicular to the papermaking direction, and the smaller stiffness is preferably 9.0 g · cm or more. The preferred range of the smaller rigidity is 9.0 to 30 g · cm, more preferably 11 to 25 g · cm, most preferably 15 to 20 g · cm. In the present invention, the ratio obtained by dividing the greater value of the stiffness in the papermaking direction and the direction perpendicular to the papermaking by the smaller value is preferably smaller, preferably 3 or less,
Most preferably, it is 2 or less.

Documents 101 to 11 shown in Table 2 were prepared by coating photographic constituent layers on the thus-prepared supports A to D2 in the same manner as in Example 1 of Japanese Patent Application No. 11-168273.
4 was obtained.

Each of these samples 101 to 114 was 127 mm × by Rocky S, a mini lab manufactured by Fuji Photo Film Co., Ltd.
By printing with a screen size of 89 mm, and making the shape of the blade at the part corresponding to the four corners of the print in the cutter of the stacking part into an arc shape with a radius of 3 mm and a central angle of 90 °,
One corner was formed round (sample 102). For comparison, a print without rounding the four corners was prepared (Sample 101). Samples 103 to 114 were prepared in exactly the same manner as Samples 101 and 102 except that the shapes of the support and the four corners were as shown in Table 2.
(Table 2 shows the rounded ones as in No. 2 as "circles" and the non-rounded ones as "right angles").

For strength evaluation, 10 mm from the end of each processed sample was wrapped 90 ° around a 10 mm diameter cylinder at 90 °, and after 15 seconds had elapsed, the cylinder was removed. After 15 seconds, the curl (the print was placed on a flat surface) (The heights of the vertices of the four corners from the flat surface). In addition, for the evaluation of integration, after printing 1500 samples of each sample continuously,
It was evaluated how many sheets can be stacked by stacking 100 sheets at a time.

[0064]

[Table 2]

As shown in Table 2, when the support A for comparison was used, the degree of curl was large, which was not preferable. Further, even when the supports B to D2 are used, it is understood that the number of sheets that can be stacked is small when the four corners are not rounded. On the other hand, in each sample of the present invention using the supports B to D2 and having four corners in a predetermined shape, a printed photograph having high strength (resistance to bending) and good integration was obtained. It turns out that there is.

Example 2 The same evaluation as in Example 1 was performed, except that the minilab used was changed to Frontier 350 manufactured by Fuji Photo Film Co., Ltd. High integration was good. This frontier 3
At 50, the photographic light-sensitive material is round-cut by the above-described method to form a cut sheet having four rounded corners, and the cut sheet is subjected to printing exposure and development processing.

Example 3 A sample was prepared by changing the composition of the red-sensitive emulsion layer of the samples 101 to 114 of Example 1 as follows.
As a result of performing the same evaluation, as in Example 1, each sample of the present invention had high strength and good integration.

Red-sensitive emulsion layer Silver chlorobromide emulsion C (cubic, 1: 4 mixture (larger silver ratio) of large-size emulsion C having an average grain size of 0.50 μm and small-size emulsion C having an average grain size of 0.41 μm, silver grain ratio). The coefficient of variation of the distribution was 0.09 and 0.11, respectively. In each size emulsion, 0.8 mol% of silver bromide was contained locally on a part of the surface of the grains based on silver chloride.) 0.16 Gelatin 1 0.000 Cyan coupler (ExC-1) 0.05 Cyan coupler (ExC-2) 0.18 Cyan coupler (ExC-3) 0.024 UV absorber (UV-1) 0.04 UV absorber (UV-3) 0.01) Ultraviolet absorber (UV-4) 0.01 Color image stabilizer (Cpd-1) 0.23 Color image stabilizer (Cpd-9) 0.01 Color image stabilizer (Cpd-12) 01 color image stabilizer (Cpd-13) 1 solvent (Solv-6) 0.23

[0069]

According to the present invention, a support having increased rigidity by coating a base paper with a resin containing polyester as a main component or a support having increased rigidity by using a biaxially stretched polyolefin layer having micropores. When cutting is performed, the occurrence of burrs at four corners can be suppressed by performing round cut or chamfer cut. As a result, there is no reduction in integration due to burrs. Also, by round cutting the four corners at the same time, without lowering the processing speed,
High-speed processing becomes possible. In addition, since the four corners of the support having increased rigidity do not have sharp points, it is possible to prevent the fingers, the chest and the like from being struck at these corners. In particular, by using the die set cutter, the cut edge does not become sharp, and the edge does not hurt the finger.

Also, a first cutter for cutting the photographic photosensitive material in the width direction, and both corners of the rear end of the rectangular sheet cut at the first cutter and arranged at positions facing both side edges of the photographic photosensitive material in the width direction. A second cutter for cutting both corners of the front end of the next photographic light-sensitive material 10, and photographic light-sensitive material feeding means for feeding the rectangular sheet cut by the first cutter and the next photographic light-sensitive material to the second cutter. By providing this, it is not necessary to use a conventional I-shaped cutter, so that a portion discarded by cutting can be suppressed, and waste of the photosensitive material can be eliminated. Further, since the cutting is performed separately for the first cutter and the second cutter, the load at the time of cutting can be reduced, the size of the drive motor can be reduced, and the durability of the blade can be improved.

Further, the second cutter is connected to the right cutter body,
By constructing the left cutter body and the moving means for moving these cutter bodies in accordance with the width of the photosensitive material, even if the width of the photosensitive material is changed, it can be easily coped with. it can.

[Brief description of the drawings]

FIG. 1 is a plan view showing a photographic light-sensitive material embodying the present invention.

FIG. 2 is a schematic view showing a paper cutter embodying the present invention.

FIG. 3 is a schematic view illustrating a paper cutter according to another embodiment.

FIG. 4 is a perspective view showing the appearance of each cutter.

FIG. 5 is an explanatory diagram showing a relationship between a photographic photosensitive material and a cut sheet.

FIG. 6 is a flowchart illustrating a processing procedure of a paper cutter.

FIG. 7 is a plan view showing a second cutter of the paper cutter corresponding to a change in the width of the photographic photosensitive material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Photosensitive material 10a Corner 11,40 Cut sheet 12 Paper cutter 15 Fixed blade 16 Movable blade 15a, 16a Arc-shaped blade part 17 Blade drive part 18,19,31-33 Paper feed roller pair 20 Feed motor 22 Mark sensor 23 Cut mark 30 Paper cutter 34 First cutter 35 Second cutter 37, 38 Electromagnetic clutch brake 51 Cut mark sensor (first sensor) 52 Rear end sensor (second sensor) 60 Second cutter 61, 62 Cutter body 63 Shift mechanism 67 Male thread

Claims (4)

[Claims] 1. A method for producing a photographic print in which four corners of a rectangular photographic print are cut out, wherein a reflective support of a silver halide photographic material used for the photographic print is synthesized by polycondensation from a dicarboxylic acid and a diol. A composition comprising a resin containing 50% by weight or more of polyester and a white pigment mixed and dispersed is coated on at least the image recording side, and an image is recorded on the silver halide photographic material or on the silver halide photographic material. A method of producing a photographic print, comprising simultaneously round-cutting or chamfering both rear-end corners and the next front-end corner of the photographic print. 2. A method for producing a photographic print in which four corners of a rectangular photographic print are cut off, wherein the reflective support of the silver halide photographic material used for the photographic print is biaxially stretched having at least one layer of micropores. Having a polyolefin layer, the silver halide photographic light-sensitive material, or a photographic print having an image recorded on the silver halide photographic light-sensitive material, simultaneously round-cut both the rear end corners and the next front end corners or A photo print creation method characterized by chamfer cutting. 3. A photographic photosensitive material cutting apparatus for separating a photographic photosensitive material into rectangular sheets, comprising: a first cutter for cutting the photographic photosensitive material in a width direction and cutting the rectangular sheet; And cuts both corners at the rear end of the rectangular sheet cut by the first cutter and both corners at the front end of the next photosensitive material.
An apparatus for cutting a photographic light-sensitive material, comprising: a cutter; and a photographic light-sensitive material feeding means for feeding a rectangular sheet cut by the first cutter and the next photographic light-sensitive material to a second cutter. 4. The apparatus according to claim 1, wherein the second cutter comprises: a right cutter body;
4. A photographic photosensitive material cutting apparatus according to claim 3, further comprising a left cutter body and a moving means for moving the cutter body in accordance with the width of the photographic photosensitive material.