JP2791820B2 - Cutting photographic material - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to cutting a flexible sheet having a laminated coating layer, and more particularly to cutting a photographic light-sensitive material.

BACKGROUND OF THE INVENTION A photographic light-sensitive material is formed on one or both sides of a flexible resin film, often under a light-sensitive silver halide emulsion layer using gelatin as a binder, as well as a protective layer, a filter layer, an antihalation layer or an adhesive. It has a multi-layer structure in which a photographic constituent layer composed of an auxiliary layer such as a coating layer is applied. Each layer has a different rheological viscoelasticity for the purpose of lamination.

In addition, as the sensitivity is increased, so-called pressure fogging is likely to occur with respect to mechanical shock and friction, while severe high temperatures and rapid automatic development processing are affected. Corresponding to such processing conditions, the degree of hardening of the photographic constituent layer is increased, but on the other hand, since the processing solution must be quickly penetrated, toughness against tearing, breaking, etc. is required rather than hardness. Physical properties such as elasticity and elongation tend to be enhanced by the coexistence of latex and the like containing additives.

In the case where such a photosensitive material composed of laminates having different rheological characteristics is cut into a predetermined size, as shown in FIG. 2, on the cut surface C, the photographic constituent layer P is in contact with the blade surface of the cutting blade. It is dragged by friction into the cutting surface, forming an overhang 1 that covers and surrounds the edge of the cutting surface, the support forming an edge step 2 in a chopped form. In the figure, P is a photographic constituent layer, and B is a support. A large strain force is exerted on the silver halide grains in the overhanging eaves 1 portion, and generally causes black fog.

Further, as a matter of course, at least the adhesion between the photographic component layer and the surface of the support is reduced, and under severe processing conditions such as automatic development, the film is peeled off from the eaves and the quality is remarkably impaired.

In order to avoid this trouble, it has been attempted to use a cutter having a sharp edge angle, but the durability of the cutter is extremely poor, and the practicality is poor due to the installation and operating accuracy of the stripper.

(Object of the Invention) It is an object of the present invention to provide a cutting method which does not cause peeling of a film from a cutting edge in cutting a photosensitive material.

(Constitution of the Invention) The object of the present invention described above is to provide at least one photographic component layer on a support and to cut the dried photographic light-sensitive material. The angle is 75 to 90 °, and the clearance between the cutting edges in the direction perpendicular to the cut surface is 5 to 15 times the thickness of the photographic light-sensitive material to be cut.
%, Which is achieved by a method for cutting a photographic light-sensitive material, wherein

 Next, the present invention will be described with reference to FIG.

In the figure, H ₁ is an upper blade having a blade angle θ of 75 to 90 °,
H ₂ is a lower blade having a cutting edge angle theta 'of 75 to 90 °. Note that θ and θ ′ need not necessarily be equal.

a is a clearance taken in a direction perpendicular to the cut surface. In the present invention, a clearance ratio (a / d) × 100 (%) = 5 to 15 is set between the clearance d and the thickness d of the photosensitive material F. Provide. For example, when cutting a photosensitive material having a thickness of d: 200 μm, a is set to 10 to 30 μm.

S is a stripper which is urged toward the photosensitive material F.

Aspects of the present invention apply to both so-called slitters and cross cutters.

(Example) For a X-ray film having a thickness of 200 μm, the clearance ratio (a / d × 100%) was set to 5, 10 and 15% and a comparison using a cross cutter in which the tip angles of the upper and lower blades were 80 °, respectively.
Cutting was performed at 2.5 and 20%, and automatic development was performed. The occurrence rate (%) of film peeling was determined and is shown in Table 1.

: Processing conditions: photosensitive material; Konica Type A automatic developing machine; Konica EX-60 developer; XD-6 (35 ° C, 47 seconds) Fixing solution; XF (35 ° C, 47 seconds) Rinse; tap water (35 ° C, 46 seconds) As is clear from Table 1, the film peeling is zero at a clearance rate of 5 to 15%, and when the range is out of the vertical direction, the film peeling sharply increases, and it is impressive that the range is extremely sharp. is there.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an embodiment of the present invention, and FIG. 2 is a perspective view of a cut surface by a conventional cutting method. θ, θ ': blade angle, a: clearance, d: photosensitive material thickness.

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B26D 1/09 B26D 3/00 601 G03C 1/00 G03D 15/04

Claims (1)

(57) [Claims] (1) in cutting at least one photographic component layer on a support and drying the photographic light-sensitive material, the cutting edge angle of two cutter blades used in combination for cutting is 75 to 90 °; A method of cutting a photographic light-sensitive material, wherein the clearance between the cutting edges in a direction perpendicular to the cut surface is 5 to 15% of the thickness of the photographic light-sensitive material to be cut.