JPH1195375A - Photographic roll film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily disengage a spool and shading paper without degrading a detaining property. SOLUTION: A detaining pawl 15 consists of a longitudinal pawl 15a and a transverse pawl 15b. A detaining hole 9 is formed at the front end of the shading paper. The detaining hole 9 consists of a semicircular engaging area 9a engaging with the detaining pawl 15 and a nearly rectangular releasing area 9b for releasing the engagement with the detaining pawl 15. The length from the central position in the thickness direction of the longitudinal pawl 15a to the front end of the transverse pawl 15b is defined as L, the shortest horizontal distance between the inclined edge 18a of the longitudinal pawl 15a and the transverse pawl 15b as (a), the angle of inclination of the inclined edge 18a as θ, the radius of the engaging area 9a as (r) and the half the thickness of the longitudinal pawl 15a as (s). The detaining pawl is then so formed that the engaging quantity factor K which is the distance in the axial direction of the part where the front end of the transverse pawl 15b overlaps on the edge of the engaging area 9a in the engaging state of the engaging area 9a with the detaining pawl 15 satisfies the equation and K>=0.5 mm and that 2L<α<=6L and d<β<=2d are satisfied when the width of the transverse pawl 15b is defined as (d), the opening width in the transverse direction of the shading paper as α and the opening width in the direction orthogonal with the transverse direction as β.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographic roll film, and more particularly to an improvement in locking a light-shielding paper and a spool of a photographic roll film.

[0002]

2. Description of the Related Art As a roll film for photography, 120 is used.
A type and a type 220 are known, each of which is provided in a form in which a band-shaped photographic film with light-shielding paper is wound in a roll shape around a shaft portion of a spool, and an end portion is fixed with an adhesive tape. The 120-type photographic roll film is provided with a light-shielding paper longer than the entire length of the photographic film fixed at one end with an adhesive tape so as to cover the entire back surface of the photographic film. The 220 type photographic roll film is made by fixing a short light-shielding paper called a leader paper or a trailer before and after the photographic film, and lengthening the photographic film to 120 mm.
The number of shooting frames is larger than that of the mold.

[0003] The spool 5 is an ISO 732-198.
2, ANSI PHI 21-1980, JIS K7
A pair of flanges that regulate both ends of the light-shielding paper are formed at both ends of the shaft, and a slit that extends in the axial direction is provided at the center of the shaft. Is formed.

In order to use a photographic roll film, an empty spool of the photographic roll film used last time is set in a film take-up chamber, and a slit of the spool is inserted into a tip of a new photographic roll film light-shielding paper. And then rotate the spool to wind the light-shielding paper. However, since the leading end of the light-shielding paper easily slips out of the slit at the beginning of this winding, it is necessary to rotate the spool while pressing the leading end of the light-shielding paper with a finger, and the loading operation of the photographic roll film is very troublesome for an inexperienced beginner. It was something.

Therefore, the present applicant has formed a circular locking hole near the leading end of the light-shielding paper, provided a locking claw at the center of one wall surface forming the slit of the spool, and provided a light-shielding member on the other wall surface. A proposal has been made to provide a pair of holding ribs for pressing the paper against the locking claw side so as to sandwich the locking claw (Japanese Patent Application Laid-Open No. Hei 9-185151). The locking claw is composed of a vertical claw erected on the wall surface and a pair of horizontal claws extending in the axial direction of the spool near the top, and the locking hole has a diameter that allows the pair of horizontal claws to be simultaneously inserted. ing. According to this, simply by inserting the leading end of the light-shielding paper into the slit of the spool, the locking hole of the light-shielding paper engages with the locking claw of the spool, so that the light-shielding paper is locked to the spool. There is no need for troublesome work such as pressing the light-shielding paper with a finger in the initial stage of loading.

[0006]

Incidentally, there is a case where the above-mentioned roll film for photography is set in a film holder more than a predetermined number before photographing. In such a case, the unphotographed photo film left after shooting is removed from the film holder, returned to the original roll shape, and then subjected to a rubber band to prevent loosening. Stored. However, in the photographic roll film described in the above publication, since the light-shielding paper once locked on the spool cannot be easily removed, if it is forcibly removed, the locking hole of the light-shielding paper is often damaged, A disadvantage arises in that it is not possible to engage the engaging pawl of the spool at the next use.

[0007] In a film developing station, work for separating the light-shielding paper from the spool frequently occurs. However, in the photographic roll film described in the above publication, it is not easy to separate the spool from the light-shielding paper. There is a problem that the hand is hurt because it is cut by hand. In addition, if the locking hole is enlarged, the ease of separation between the light-shielding paper and the spool can be easily achieved, but there is a problem that the locking property between the light-shielding paper and the spool deteriorates.

On the other hand, a spool provided with a locking claw (a spool with a locking claw) is similar in appearance to a spool without a locking claw (a conventional spool). For this reason, for example, if the conventional spool is mistaken for a spool with a locking claw, the tip of the light-shielding paper is locked to the spool even if the spool is rotated just by inserting the tip of the light-shielding paper into the slit of the spool. It slips out without being done and fails to wind the light-shielding paper.

According to the present invention, without deteriorating the locking property,
It is an object of the present invention to provide a photographic roll film having a light-shielding paper and a spool which can be easily separated when it is desired to separate them. It is another object of the present invention to provide a photographic roll film in which a spool with a locking claw can be easily distinguished from a conventional spool.

[0010]

In order to achieve the above object, a photographic roll film according to the present invention comprises a strip-shaped photographic film having a light-shielding paper fixed at least at a leading end thereof, and a slit formed in an axial direction. A spool having a cylindrical winding shaft around which the photographic film is wound in a roll shape, wherein at least one locking hole is formed at a leading end of the light-shielding paper; On one wall, a pair of inclined edges are formed so as to face each opening of the slit, and a trapezoidal plate-like vertical claw is formed on both sides near the top so as to extend in the axial direction of the spool. A pair of lateral claws, forming a locking claw engaged with the locking hole, and a pressing rib for pressing the light-shielding paper inserted into the slit against the one wall on the other wall. Formed In the true roll film, the locking hole is provided between an engaging area where the edge on the leading end side of the light-shielding paper engages with the locking claw, and the locking area is connected to the photo film side of the engaging area. And a release area where the engagement is released.

[0011] Further, the photo film comprises a strip-shaped photo film having a light-shielding paper fixed at least at a leading end thereof, and a spool having a cylindrical winding shaft formed with a slit formed in an axial direction and wound around the photo film in a roll shape. At least one locking hole is formed at the leading end of the light-shielding paper, and one of the upper and lower walls constituting the slit has a pair of inclined edges facing each opening of the slit. And a pair of lateral claws formed on both sides near the top so as to extend in the axial direction of the spool, and are engaged with the engaging holes. And the other wall is provided with a holding rib for pressing the light-shielding paper inserted into the slit against the one wall side, wherein the locking hole is provided at the leading end side of the light-shielding paper. Provided At least the edge of the light-shielding paper has an arcuate edge and is engaged with the engaging claw, and the engaging area is provided continuously on the photographic film side, and the engagement with the engaging claw is released. The engagement area is L, the length from the center position in the thickness direction of the vertical nail to the tip of the horizontal nail is L, the shortest horizontal distance between the inclined edge of the vertical nail and the horizontal nail is a, When the inclination angle of the inclined edge is θ, the radius of the arc-shaped edge is r, and the half of the thickness of the vertical nail is s, the tip of the horizontal nail is engaged with the engagement area engaged with the engagement nail. Engagement factor K, which is the axial distance of the part overlapping the edge of the joint area
Satisfies the following equation (2) and K ≧ 0.5 mm, and the release area is defined as d, the width of the lateral claw, α, the opening width in the width direction of the light shielding paper, and β, the opening width in the direction orthogonal to the width direction. When you do
L <α ≦ 6L and d <β ≦ 2d are satisfied.

[0012]

(Equation 2)

Further, a mark indicating the presence of the locking claw is provided on the outer peripheral surface of the winding shaft on the side where the locking claw is formed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 2 showing the appearance of a photographic roll film of the present invention, a photographic roll film 1 comprises:
Photo film 3 (see FIG. 3) is attached to shaft 2a of spool 2.
A photo film 5 with a light-shielding paper of 120 types consisting of a light-shielding paper 4 is wound in a roll shape.
Are fixed with an adhesive tape 6. The outer surface of the light-shielding paper 4 that becomes the outer side when wound around the shaft portion 2a is a printing surface on which a manufacturer name, a 120 type name, or the like is printed, and the inner rear surface is black with a light-shielding black layer. Surface. Flanges 2b are formed at both ends of the shaft portion 2a, and a shaft mounting hole 2c is formed at the center of each of the flanges 2b.

FIG. 3 shows a state in which the photo film 5 with light-shielding paper is removed from the spool 2 and straightened.
The light-shielding paper 4 is longer than the photo film 3, and its leading end 4a is associated with a spool for winding up (the spool 2 is the same as the spool 2 and is not distinguished hereinafter). A locking hole 9 to be engaged with the pawl is formed. The locking hole 9 is provided on the leading end side of the light-shielding paper 4, as will be described in detail later, and engages with a locking claw of the spool 2 to lock the light-shielding paper 4 to the spool 2. Area 9
a, and a rectangular release area 9b, which is provided on the photo film 3 side of the engagement area 9a and is long in the width direction, in which the engagement with the locking claw is released and the light shielding paper 4 is removed from the spool 2. The base of the photo film 3 is a light-shielding paper 4.
And is joined to the light-shielding paper 4 by the joining tape 8 at the leading end of the photographic film 3.

The spool 2 is connected to one opening 7 of the slit 7.
4A shown in FIG. 4A, the leading end 4a of the light-shielding paper 4 is engaged with the shaft 2a of the spool 2 by engaging with the engaging hole 9 at the center of one wall 12a forming the slit 7. A T-shaped engaging claw 15 is protruded. A mark 1 indicating the presence of the locking claw 15 is provided on the outer peripheral surface of the shaft portion 2a on the side where the locking claw 15 protrudes, as indicated by hatching.
0 is provided. The mark 10 can be formed by, for example, molding the spool 2 in two colors to make only the mark portion red, or by engraving with the irregularities of a mold. By checking the mark 10, it is possible to easily distinguish the spool 2 with the locking claw from the conventional spool without the locking claw.

The locking claw 15 is composed of a trapezoidal plate-shaped vertical claw 15a that stands vertically from the wall 12a, and a pair of horizontal claws 15b that extend in the axial direction from both side surfaces near the top. On the other wall 12b constituting the slit 7, a pair of pressing ribs 16 for pressing the light-shielding paper 4 against the locking claw 15 are formed at equal intervals around the locking claw 15.
5 and the holding rib 16 are symmetrical when viewed from the openings 7a and 7b. Further, the locking claw 15 and the holding rib 16 are symmetrical when viewed from the side orthogonal to the axial direction of the shaft portion 2a, and similarly from both sides of the openings 7a and 7b of the slit 7. The leading end 4 a of the light-shielding paper 4 can be guided toward the locking claw 15. The distance D ₂ between the pressing rib 16 is slightly wider than the width D ₁ of the front end portion 4a, tip end portion 4a between the pressing ribs 16
Is guided to the locking claw 15.

In FIG. 1, the inclined edge 18 of the vertical claw 15a of the locking claw 15 has two angles. If the inclination angle θ of the top-side inclined edge 18a is large, the light-shielding paper holding may occur at the switching point with the bottom-side inclined edge 18b. Therefore, the inclined angle θ is preferably 45 ° or less. Further, if the inclination angle θ is too small, the locking property with the locking hole 9 is deteriorated.

When the engagement area 9a of the engagement hole 9 is engaged with the engagement claw 15, the edge of the engagement area 9a is
The width of the substantially triangular portion where the corner b overlaps in the spool axis direction is defined as the locking amount factor K. Then, the engagement area 9a
Is the radius of r and half of the thickness of the vertical claw 15a (hereinafter, the vertical claw 15a
S) and the length of the horizontal claw 15b (half the length between the tips) as L, the edge of the engagement area 9a and the vertical claw 1
Distance f from engagement end P with 5a to edge 21 of lateral claw 15b
Is represented by the following Expression 3.

[0020]

(Equation 3)

By transforming the equation (3), the locking amount factor K is expressed by the following equation (4).

[0022]

(Equation 4)

As shown in FIG. 5, the leading end 4a of the light-shielding paper 4
Into the opening 7a of the slit 7, the tip 4a
Goes to the top along the inclined edge 18a of the vertical claw 15a. During this time, the leading end 4a of the light-shielding paper 4
Since the horn curls in a gutter shape, the leading edge may be caught on the end of the lateral claw 15b. Assuming that the shortest horizontal distance from the edge 21 of the horizontal claw 15b to the inclined edge 18a of the vertical claw 15a is a, the distance from the distal edge of the tip 4a in contact with the inclined edge 18a to the edge 21 of the horizontal claw 15b is asin θ. Becomes When the light-shielding paper 4 is locked to the locking claw 15, the edge of the locking hole 9 is pulled toward the top and slightly deformed, so that asin θ is substantially equal to f in the above-described mathematical expressions 5 and 6. Therefore, when asin θ is substituted for Equation 4 instead of f, the following Equation 5 is obtained.

[0024]

(Equation 5)

An experiment was conducted on the state of engagement between the spool 2 and the light-shielding paper 4 by changing the value of K variously. As a result, it is preferable that K ≧ 0.5 mm in terms of engagement. I understood. That is, a, L,
Each value of r, s, and θ preferably satisfies Equation 5 and K ≧ 0.5 mm. In addition, the height of the holding rib 16 is the wall 1
The smaller the clearance with 2a, the better,
The clearance needs to be 0.25 mm to 0.3 mm from the moldability.

On the other hand, the size of the release area 9b is determined in consideration of the strength of the light-shielding paper 4 and the like in addition to the ease with which the locking claw 15 comes off.
Assuming that the width of the lateral claw 15b is d, the opening width α in the light-shielding paper width direction of the release area 9b satisfies 2L <α ≦ 6L, and the opening width β in the light-shielding paper longitudinal direction satisfies d <β ≦ 2d. Is preferred. The four corners of the release area 9b are formed in an arc shape so that the light-shielding paper 4 does not tear from the release area 9b.

The operation of the photographic roll film 1 configured as described above will be described. First, when the outer peripheral surface of the shaft portion 2a of the spool 2 is viewed, the presence of the mark 10 clearly indicates that the spool 2 has the locking claw 15. Next, as shown by a two-dot chain line in FIG. 6, when the leading end 4a of the light-shielding paper 4 is inserted into the opening 7a of the slit 7, the leading end 4a
Is inserted into the center of the slit 7 with both edges guided by a pair of holding ribs 16.

When the inclined edges 4b, 4c are brought into contact with both ends of the slit 7, the center of the locking hole 9 coincides with the center of the locking claw 15, and the outline of the horizontal claw 15b is included in the locking hole 9. In this state, the retaining rib 16 is pressed against the wall 12 a by the retaining rib 16, so that the upper portion of the retaining claw 15 falls into the retaining hole 9. Next, when the spool 2 is rotated, the locking claw 15 moves to the engagement area 9a side as shown in FIG.
Both ends of 5b are engaged with the edge of the engagement area 9a, and the leading end 4a of the light-shielding paper 4 is locked to the spool 2.

If the rotation of the spool 2 is continued as it is,
The leading end 4a of the light-shielding paper 4 is wound around the shaft 2a. After closing the back cover of the camera by aligning the arrow printed on the back of the light-shielding paper 4 with the start mark of the camera, and further performing the winding operation, the first frame of the photo film 3 is set in the aperture, The shutter is charged, and the preparation for photographing is completed.

After all photographing is completed, the photographic roll film 1 is taken out of the camera, the photographic film 3 is developed, and then when the light-shielding paper 4 is removed from the spool 2 or once set in the camera, photographing is stopped. When removing the light-shielding paper 4 from the spool 2 in order to return the photographic roll film 1 taken out of the camera to the original state, as shown in FIG. While pulling it down while pushing it down to the wall 12a side (the side on which the mark 10 is provided) on which is embedded, and pressing the root side of the light-shielding paper 4 against the wall 12b side. As a result, as shown in FIG. 8, the lateral claws 15b move to the release area 9b, and the light-shielding paper 4 moves in the direction away from the locking claws 15, so that the engagement between the locking holes 9 and the locking claws 15 is increased. Is canceled. The inclined edges 4b and 4c are slightly deformed by being pressed against both edges of the slit 2, but do not cause any problem. If the light-shielding paper 4 is pulled away from the spool 2 in this state, the light-shielding paper 4 is easily separated from the spool 2.

In the embodiment described above, the shape of the locking hole is constituted by a combination of an arc and a rectangle as shown in FIG. 6 and the like. However, the present invention is not limited to this. A locking hole 31 having a shape as shown may be used. The locking hole 31 is formed by widening the release area 9b. The locking hole 31 is provided on the leading end side of the light-shielding paper 4, and is formed with an arc-shaped edge 31a which is engaged with the horizontal claw 15b of the locking claw 15 and is connected to this. And a pair of inclined edges 31b and a U-shaped edge 31c forming a release area of the locking hole 31. Since the locking hole 31 has a wide release area, the engagement with the locking claw 15 can be more easily released.

The paper support used for the light-shielding paper used in the present invention is not particularly limited. In addition to the paper support mainly made of natural pulp, natural pulp and synthetic fibers or natural fibers may be used as necessary. A paper support obtained by mixing synthetic pulp with an arbitrary ratio can be used. In addition, a paper support in which recycled pulp and waste paper are mixed in an appropriate amount, and a paper layer made of recycled pulp and waste paper are combined with a paper layer made of natural pulp. The body can be used.

As the natural pulp, kraft pulp of softwood, hardwood, and mixed softwood broadleaf is preferable. As the natural pulp used in combination with kraft pulp, sulfide pulp is preferable, but SCP, CGP, TMP, and RGP are used.
And high yield pulp can also be used in an appropriate amount.

Various additives can be incorporated into the paper support of the present invention when preparing the stock slurry. In particular, fatty acid metal salts and / or fatty acids as sizing agents,
Alkyl ketene dimer emulsion or epoxidized higher fatty acid amide, alkenyl or alkyl succinic anhydride emulsion, rosin derivative described in JP-B-62-7534; anionic and cationic as a dry paper strength enhancer Or benign polyacrylamide, polyvinyl alcohol, and cationized starch (for example, see JP-A-3-171)
No. 042), vegetable galactomannan and the like; polyamine polyamide epichlorohydrin resin and the like as a lubricating paper strength enhancer; clay, kaolin, calcium carbonate, titanium oxide and the like as filler; aluminum chloride, bansulfate and the like as a fixing agent Water-soluble aluminum salts and the like; pH adjusting agents such as caustic soda, sodium carbonate, sulfuric acid, etc., JP-A-63-204251, JP-A-1-26653
It is desirable to incorporate a color pigment, a color dye, a fluorescent image whitening agent and the like described in JP-A No. 7 and the like in an appropriate combination.

The paper support may further contain various water-soluble polymers, latex, emulsion, and additives such as an antistatic agent by various coating methods, spray, tab size, size press and the like.

The water-soluble polymer is disclosed in
No. 6537, starch-based polymers, polyvinyl alcohol-based polymers, gelatin-based polymers, polyacrylamide-based polymers, cellulose-based polymers, and the like;
Examples of the antistatic agent include nonionic surfactants represented by polyoxyethylene glycols, cationic surfactants represented by quaternary ammonium salts, amphoteric surfactants, alkylamine derivatives, fatty acid derivatives, various Lubricant,
Carbon black, graphite, metal surface coating pigment,
There are conductive materials such as metal powder, metal frame, carbon fiber, metal fiber, and whisker (potassium titanate, alumina nitride, alumina). Specific compounds include alkali metal salts such as sodium chloride and potassium chloride, and calcium chloride. And alkaline earth metal salts such as barium chloride, colloidal metal oxides such as colloidal silica, and organic antistatic agents such as polystyrene sulfonate.

As latex and emulsions, petroleum resin emulsion, styrene-acrylic acid-acrylate copolymer, styrene-acrylic acid-butadiene copolymer, ethylene-vinyl acetate copolymer, styrene-
Latexes such as maleic acid-acrylic acid ester copolymers; clay, kaolin, talc, barium sulfate, titanium oxide, etc. as pigments; hydrochloric acid, phosphoric acid, citric acid, caustic soda, etc. as pH regulators; It is desirable that additives such as a coloring dye and a fluorescent whitening agent are appropriately combined and contained.

Further, even when the paper support alone is used for complete shading, or when a shading layer is provided in a later step, black paper may be used for the shading paper support as an auxiliary shading layer. 1 to 15% by weight of furnace carbon black having a particle size of 15 to 80 μm,
Black paper supports containing 0.1% to 10% by weight of synthetic zeolite m are preferred. Particularly, 0.01 to 5% by weight of a cationic water-soluble polymer and a black or blue cationic dye (a diarylmethane type, a triallylmethane type, a thiazole having a positive charge in a coloring portion) are further added to the above black paper support. Methine-based, xanthine-based, oxazine-based, thiazine-based, azo-based, and anthraquinone-based dyes).

Next, regarding the stock slurry to which the internal additive has been added, for example, JP-A-58-37642, JP-A-61-260240, and JP-A-61-2847.
No. 62, etc., using an appropriate papermaking method, a fourdrinier paper machine, using a commonly used paper machine such as a round net paper machine, to produce a uniform formation can be obtained, Further, after papermaking, by calendering using a machine calendar, super calendar, heat calendar, etc.,
The basis weight of the paper support is 50 g / m ^{2 to} 100 g / m ^2.
2 , preferably 60 g / m ^{2 to} 90 g / m ² ,
5 μm to 120 μm, preferably 60 μm to 100 μm
In the range of, and physical performance, to prevent adverse effects due to irregularities on the paper support surface such as scratches and pressure fog on the photosensitive material,
A base paper having a smoothness of 90 seconds or more as defined in JISP-8119 is preferable in order to eliminate gaps between the photosensitive material and improve light-shielding properties and moisture-proof properties.
In seconds or more, the air permeability (JISP-8117) has 500 seconds or more, and the sizing degree is 1 in the post-process or in the stiff hide size (JISP-8122) based on the water and moisture resistance of the light-shielding paper.
Supports having 0 seconds or more are preferred.

In the present invention, the breaking strength of the locking hole due to the locking claw poses a problem, but the driving load of the camera is such that a pulling load of about 200 g to 300 g is generated. The stopping force is preferably 500 g or more. Therefore, as the base paper strength, the tensile strength (JISP-8113) (vertical) 4.5 kgf /
15 mm or more, tear strength (JISP-8116) is 3
It preferably has a characteristic of 5 gf or more.

As the thermoplastic resin for processing the light-shielding layer on the back surface of the paper support, USP-2646365, USP-2
646366, USP-2751309, USP-29
59492, FR-1449852, JP-B-51-49
No. 205, JP-A-48-22020, and JP-A-50-676.
No. 44, No. 55-140835, No. 58-17434
No. 58-186744, No. 59-68238,
No. 60-35728, JP-A-6-51450, etc., low density, medium density, high density, linear low density polyolefins such as polyethylene and polypropylene, polyvinyls such as ethylene vinyl acetate, ethylene ethyl acrylate Acrylics such as and ethylene methyl acrylate,
A simple substance such as a rubber-based substance such as styrene / butadiene, a simple substance such as ionomer, a graft polymer polyamide-based substance, or a polyester-based substance such as polyethylene / terephthalate, or a blend or a copolymer of two or more kinds of such substances may be used. The resin may be provided as two or more layers.

As the light-shielding substance added to the resin, carbon black, titanium nitride and graphite, which are light-absorbing light-shielding substances having excellent hiding power, are preferable. For the purpose of improving light-shielding properties, cost and physical properties, carbon black is preferably used. Good.
In particular, furnace carbon black is generally and preferably used, but may be manufactured by any of channel and thermal methods. In particular, acetylene carbon black and Ketjen carbon black, which is a modified by-product carbon black, are preferable as the light-shielding substance having an antistatic effect.

When used as a melting and packaging material for the photographic light-sensitive material of the present invention, no fogging occurs, does not affect the increase / decrease of the light sensitivity, has a large light-shielding ability, and even when added to a resin, a film such as buttocks and fish eyes. Alternatively, among carbon blacks, pH is 6.0 to 9.0, and average particle diameter is 10 μm to 120 in particular, since pinholes are hardly generated in the film.
μm, preferably 15 μm to 100 μm, particularly preferably 20 μm to 80 μm, the volatile component is 2.0% or less, preferably 1.0% or less, particularly preferably 0.5% or less, and the oil absorption is 50 ml / 100 g or more, preferably Is 70ml /
Furnace carbon black of 100 g or more, particularly preferably 100 ml / 100 g or more, is preferred because it improves light-shielding properties and dispersibility, and has little adverse effect on photographic light-sensitive materials and little deterioration in physical properties.

Actual products include, for example, carbon blacks # 20 (B), # 30 (B) and # 33 manufactured by Mitsubishi Kasei.
(B), # 40 (B), # 41 (B), # 44 (B),
# 45 (B), # 50, # 55, # 100, # 600,
# 2200 (B), # 2400 (B), MA8, MA1
1, MA100 and the like.

Overseas products include, for example, Black Pearls 2, 46, 70, 71,
74, 80, 81, 607 etc., Regal 300, 3
30, 400, 660, 991, SRF-S, etc., Vul
Sterling 10, SO, V, can 3, 6, etc.
S, FT-FF, MT-FF and the like.

Further, Unit of Ashland Chemical Co., Ltd.
ed R, BB, 15, 102, 3004, 3006
3007, 3008, 3009, 3011, 3012
XC-3016, XC-3017, 3020 and the like, but are not limited thereto.

4% to 30% by weight of these light-shielding substances
As a means for providing the contained resin on a paper support, the
There are two ways.

As one of the methods, a method in which a liquid in which a resin is dispersed or dissolved in an organic solvent or water or the like is applied to paper and fitted. The application method can be, for example, a reverse swirl method, a blade method, an air knife method, a rod method, a curtain method, an extrusion method, or a gravure method, but is not limited thereto. The dry film thickness of the resin layer obtained by these methods is 1 μm.
m to 25 μm is appropriate.

As a second method, there is a method in which a resin is melted by heat and provided on a paper support. As an application method, an extrusion method is generally used, but other application methods may be used. The dry film thickness of the resin layer obtained by this method is suitably from 5 μm to 60 μm.

As a last method, a uniform film is formed into a film having a thickness of 20 to 40 μm by an inflation method, a T-die method, a casting method, and a roll method.
This is a method of dry laminating and fixing with an adhesive of 1 to 3 g / m ² such as a polyurethane-based or polyether-based adhesive, but the light-shielding paper used in the present invention may be prepared by any method.

Characters and symbols necessary for the function on the surface of the light-shielding paper,
Alternatively, printing is performed to increase the commercial value, but as the ink used in these printings, those harmless to photosensitive materials are generally used. Typical synthetic resins are vinyl chloride and acetic acid. Vinyl copolymer resin, nitrified cotton,
Polyester, polyamide urethane, polyacryl, rosin-modified maleic acid, ethylene vinegar, vinyl ether, urethane vinegar, salt vinegar biurethane resin, modified alkyd resin, modified phenol resin, alkali-soluble resin (rosin-modified maleic resin, styrene Maleic acid resin, styrene acrylate resin, acrylate acrylate resin, methacrylate acrylate resin), hydrosol type resin (styrene maleate resin, styrene acrylate resin, α-methyl styrene acrylate resin, acrylate acrylate) Acid resin, methacrylate acrylate resin), emulsion type resin (styrene resin, styrene acrylate resin, acrylate copolymer resin, methacrylate copolymer resin), resin for UV ink Polymers having an acrylic unsaturated group are generally used, and typical examples are polyester / acrylate, polyester / urethane resin / acrylate, epoxy resin / acrylate, pentaerythritol Examples include triacrylate, trimethylolpropane triacrylate, hexanediol diacrylate, neopentyl glycol diacrylate, triethylene glycol diacrylate, and hydroxyethyl methacrylate.

A commonly known coloring agent is used in combination with these inks. Examples of the coloring agent used include various pigments and azo pigments described in JP-A-63-44653 (Azo Lake; Carmine 2B, Red 2B, insoluble azo; monoazo yellow (PY-1, -Y).
3), disazojero (PY-12, -13, -14,
-17, -83), pyrazolo orange (PO-B-3)
4), Vulcan orange (PO-16), general azo type;
Chromophthaluiero (PY-93, -95), Chromophthal Red (PR-144, -166)), polycyclic pigment (phthalocyanine-based; copper phthalocyanine blue (PB-
15, -15-1, -15-3), copper phthalocyanine green (PG-7), cyoxazine type; cyoxazine violet (PV-23), isoindolinone type; isoindolinone yellow (PY-109, -110) Perylene, perinone, flavanthrone, thioindigo, lake pigments (malachite green, rhodamine B, rhodamine G, Victoria blue B) and inorganic pigments (oxide, titanium dioxide, red iron, sulfate); precipitated barium sulfate, Carbonate; precipitated calcium carbonate, silicate;
Hydrated silicate, anhydrous silicate, metal powder; aluminum powder, bronze powder, zinc dust, carbon black, graphite, navy blue and the like. These pigments may be added as a light-shielding substance to the above-mentioned resin layer, paper layer and the like. In addition, oil-soluble dyes, dispersible dyes and the like are also used). In addition, various solvents, dispersants, wetting agents, defoamers, leveling agents, thickeners, stabilizers, as necessary, as raw materials constituting the ink,
Additives such as a cross-linking agent, wax, and dryer are used.

Further, a protective layer (also called a lacquer coat layer or a varnish) may be applied for protecting the gloss of the surface and the printed portion on the surface. Examples of the type of the protective layer used at this time include acrylic resins, cellulose resins such as cellulose acetate, urethane resins, epoxy resins, polyester resins, ionomer resins, EEA resins, and various polyethylene resins (low density, high density, low linearity). An appropriate resin such as a density polyethylene or the like) or a polypropylene resin can be used. Also, wax and the like can be used.

As the resin for the spool used in the present invention, polystyrene resin is generally used in view of strength, heat resistance, dimensional stability, appearance and the like, and synthetic rubber such as butadiene rubber is used as styrene monomer. Even if a polymerized high-impact polystyrene resin (hereinafter referred to as HIPS) or a resin obtained by blending a medium-impact polystyrene resin (hereinafter referred to as MIPS) and a general-purpose polystyrene resin (hereinafter referred to as GPPS) is used, HIPS or MIPS alone resin is used. Alternatively, a resin in which GPPS and rubber are blended may be used. Preferred is a case where a resin obtained by blending HIPS and GPPS is used or a case where a resin of MIPS alone is used, and the impact resistance and the abrasion resistance are improved.

The amount of rubber added is 0.5 to 6.0% by weight depending on the price, physical strength, injection moldability, surface strength (to prevent scratches and abrasion), appearance, and the like. If the amount of rubber is less than 0.5% by weight, there is a problem in securing physical strength and surface strength. If the amount of rubber exceeds 6.0% by weight,
There is a problem in injection moldability, rigidity, appearance, price, etc., and it cannot be put to practical use.

As the polymerization method most commonly used at present, bulk polymerization in which monomer alone is used without using a solvent or a dispersant used in JP-A-64-91136, or in general, An irregular bulk polymerization method in which an industrialized monomer, catalyst, and a small amount of a solvent are added, or a medium in which the monomer is not dissolved at all or hardly soluble (mainly water) is dispersed in the medium. Any of three polymerization methods, namely, suspension polymerization in which polymerization is carried out using a polymerization initiator which is hardly soluble in a monomer and which is easily soluble in a monomer, may be used.

Since the brownie spool protects the photosensitive film, which is fogged by light, from light together with light-shielding paper, light-shielding properties are naturally required, and representative examples of light-shielding substances for this purpose are described below.

(1) Inorganic Compound Oxides: silica, diatomaceous earth, alumina, titanium oxide, iron oxide, zinc oxide, magnesium oxide, antimony oxide, barium ferrite, strontium ferrite, beryllium oxide, pumice, pumice balloon, alumina fiber, etc. Hydroxide: aluminum hydroxide, magnesium hydroxide, basic magnesium carbonate, etc. Carbonates: calcium carbonate, magnesium carbonate,
Dolomite, Dawn Night, etc. (Sulfite): calcium sulfate, barium sulfate, ammonium sulfate, calcium sulfite, etc. Silicates: talc, clay, mica, asbestos, glass fibers, glass balloons, glass beads, calcium silicate, montmorillonite, bentonite, etc. Carbonic acid: carbon black, graphite, carbon fiber, carbon hollow sphere, etc. Others: iron powder, copper powder, lead powder, tin powder, stainless powder, var pigment, aluminum powder, molybdenum sulfide, zeolite, polon fiber, silicon carbide fiber, brass fiber, potassium titanate, lead zirconate titanate, Zinc borate,
Barium metaborate, calcium borate, sodium borate, aluminum paste, etc.

As a light-shielding substance used in the spool of the present invention, when used, photographic light-sensitive materials are less likely to generate fog, have less change in sensitivity, and have a large light-shielding ability, and are hardened even when added to polystyrene resin. (Butsu)
Carbon black is preferable in that the generation of hardly occurs.

Examples of classification according to the raw material of carbon black include gas black, furnace black, channel black, anthracene black, acetylene black, Ketjen carbon black, thermal black,
There are lamp black, oil smoke, pine smoke, animal black, vegetable black and the like. In the present invention, furnace carbon black is desirable for the purpose of ensuring light-shielding properties, improving cost, improving physical properties, and not adversely affecting photographic characteristics. As an expensive light-shielding substance having an antistatic effect, acetylene carbon black and irregular by-products are used. Ketjen carbon black, which is carbon black, is desirable.

Among carbon blacks, pH (JIS)
K is measured by K 6221), preferably from 6.0 to 9.0, more preferably from 6.5 to 8.5, and the average particle diameter (measured by electron microscopy) is from 10 to 120 µm, particularly preferably from 12 to 70 µm. Among them, especially volatile components (JIS K 622)
1) is 3.5% or less, most preferably 1.5% or less, and the DBP oil absorption (measured by the oil absorption A method of JIS K 6221) is 50 ml / 100 g or more, most preferably 7 or more.
Furnace carbon black of 0 ml / 100 g or more. Channel carbon black is expensive, and most of them have a volatile component exceeding 5.0%, and most of them cause fogging on photographic light-sensitive materials, which is not preferable. Most lamp blacks having a pH of 5.0 or less adversely affect the photographic properties. Therefore, even when it is necessary to use the lamp black, the influence on the photographic properties should be investigated and selected. Further, unless the sulfur component is determined to be 0.9% or less, preferably 0.7% or less according to the measurement method of ASTM D 1619-60, photographic properties are adversely affected. In particular, the free sulfur component is 0.
It is preferred to select ones of 1% or less, most preferably 0.05% or less.

Preferred carbon black products include, for example, carbon black # 20 manufactured by Mitsubishi Kasei.
(B), # 30 (B), # 33 (B), # 40 (B),
44 (B), # 45 (B), # 50, # 55, # 10
0, # 600, # 2200 (B), # 2400 (B),
MA8, MA11, MA100 and the like. Overseas products include, for example, Cabot Black P
earls 2, 46, 70, 71, 74, 80, 8
1,607 etc., Regal 300, 330, 40
0,660,991, SRF-S etc., Vulcan
3, 6, etc., Sterling 10, SO, V, S, F
T-FF, MT-FF and the like. Further, Ashland Chemical's Unitel R, BB, 1
5,102,3001,3004,3006,300
7, 3008, 3009, 3011, 3012, XC-
3016, XC-3017, 3020 and the like, but are not limited thereto.

The amount of furnace carbon black added is
From the viewpoints of price, securing the physical strength of the spool, securing light-shielding properties, preventing photographic adverse effects, injection moldability, appearance, etc., from 0.05 to
3.00% by weight is desirable. If the addition amount of the furnace carbon black is less than 0.05% by weight, the light shielding property cannot be secured and light fog occurs unless the thickness of the spool is increased. If the wall thickness is increased and 0.05% by weight is attempted to secure the light-shielding property, the molding cycle becomes longer, molding failure such as sink occurs, and the amount of resin used increases, resulting in an increase in cost. If the carbon content exceeds 3.00% by weight,
In addition to being expensive, the physical strength of the spool is reduced and a weld line is generated. Further, not only is it easy to absorb moisture, causing photographic adverse effects, but also poor appearance of the spool (silver stripes, uneven gloss, reduced gloss), scratches and abrasion on the spool surface are likely to occur. Further, the fluidity of the resin deteriorates and the injection moldability also decreases.

As the dispersant for the light-shielding substance, one or more selected from low-molecular-weight styrene polymers, polyethylene wax, polypropylene wax, derivatives thereof, ethylene bisamides, and metal soaps Is used. Preferably, zinc stearate or magnesium stearate is used. Carbon black-containing masterbatch pellets can contain a dispersant to such an extent that no adverse effects are caused by the addition of the dispersant, but in the case of zinc stearate, the final molded article is 0.01 to 0.3.
% Is preferable, and when it exceeds about 0.3% by weight in the final molded product, the gloss of the final molded product and swelling (sweating) on the mold at the time of molding are increased, and there is a possibility of causing a foreign matter adhesion failure to the molded product. When zinc stearate is 0.01% by weight or less, the effect is not sufficiently exhibited.

Further, a lubricant may be added to the spool of the brownie film to improve the slipperiness with the side of the light-shielding paper, and to further improve the effect of preventing winding up. Specific examples of the lubricant include the following.

(1) Fatty acid amide-based lubricant (saturated fatty acid amide-based lubricant) Behenic acid amide-based lubricant; Diamid KN (Nippon Kasei) and other stearic amide-based lubricants; Fatty acid Amamid AP-1 (Nippon Kasei), Amide S. Amide T (Nitto Chemical), Neutron-2 (Nippon Seika), etc. (Hydroxystearic amide lubricant) Palmitic amide lubricant; Neutron S -18
(Nippon Seika), Amide P (Nitto Chemical), etc. Lauric amide lubricants; Armide C (Lion
(Akzo), Diamid (Nippon Kasei), etc. (Unsaturated fatty acid amide-based lubricants) Erucamide amide-based lubricants; Alflow P-10 (Nippon Oil & Fats), Neutron-S (Nippon Seika), LUBROL
(I ・ C ・ I), Diamid L-200 (Nippon Kasei)
Oleic acid amide-based lubricants; Armoslip CP (Lion Akzo), Neutron (Nippon Seika), Neutron E-18 (Nippon Seika), Amide O (Nitto Chemical),
Diamid O-200 / Diamid G-200 (Nippon Kasei), Alflo E-10 (Nippon Yushi), fatty acid amide O (Kao), etc. (Bis fatty acid amide lubricant) Methylene bisbehenic amide lubricant; Mid NK bis (Nippon Kasei), etc. Methylene bis stearamide amide lubricant; Diamid 200 bis (Nippon Kasei), Armowax (Lion Akzo), Bisamide (Nitto Chemical), etc. Methylene bis oleamide amide lubricant; Lubron O
(Nippon Kasei) etc. Ethylene bis stearamide amide lubricant; Armoslip EBS (Lion Akzo) etc. Hexamethylene bis stearamide amide lubricant; Amid 65 (Kawaken Fine Chemical) etc. Hexamethylene bis oleamide amide lubricant; Amide 60 (Kawaken Fine Chemical), etc. (2) Nonionic surfactant-based lubricant; Electrostripper TS-2, Electrostripper TS-3 (Kao Soap), etc. (3) Bicarbonate-based lubricant; Liquid paraffin, natural paraffin, microwax, synthetic paraffin, polyethylene wax (molecular weight of 6000 or less is preferable), (preferably molecular weight of 6000 or less) polypropylene wax, chlorinated hydrocarbon, fluoro carboxylic, etc. (4) fatty acid lubricants; higher fatty acids (C ₁₂ or more, specifically Is a turnip Acid, stearic acid, oleic acid, erucic acid, palmitic acid, etc.), oxy fatty acids, etc. (5) Ester lubricants; lower alcohol esters of fatty acids, polyhydric alcohol esters of fatty acids, polyglycol esters of fatty acids, fatty alcohols of fatty acids Esters, etc. (6) Alcohol-based lubricant; polyhydric alcohol, polyglycol, polyglycerol (7) Metal soap; lauric acid, stearic acid, succinic acid, stearyl lactic acid, benzoic acid, hydroxystearic acid, lactic acid, phthalic acid, ricinoleic acid , Naphthenic acid, oleic acid, palmitic acid, higher fatty acids such as erucic acid and L
i, K, Na, Mg, Ca, Sr, Ba, Zn, Cd,
Examples include compounds with metals such as Al, Sn, Pb, and Cd, and preferred are magnesium stearate, calcium stearate, zinc stearate, and magnesium oleate. (8) Partially saponified montanic acid ester (9) Silicone-based lubricant; various grades of dimethylpolysiloxane and its modified products (Shin-Etsu Silicone, Toray Silicone)

Preferably, organopolysiloxanes having a dimethylpolysiloxane structure having a viscosity of 1,000 to 60,000 CS are added in the range of 0.05 to 2.20% by weight.

Various additives can be appropriately added to the resin used for the spool. Specifically, an antioxidant, a light stabilizer, an ultraviolet absorber, a nucleating agent, an antistatic agent, or alumina, kaolin, clay, calcium carbonate, mica, talc, titanium oxide, A filler such as silica or the like, or a reinforcing agent such as glass roving, metal fiber, glass fiber, glass milled fiber, or carbon fiber may be added.

[0069]

As described above, according to the photographic roll film of the present invention, the engaging hole formed at the leading end of the light-shielding paper is constituted by the engaging area and the releasing area. Is engaged with the locking claw, the light-shielding paper can be locked on the spool, and the light-shielding paper can be easily separated from the spool by moving the locking claw to the release area.

The locking hole formed at the leading end of the light-shielding paper comprises an engaging area and a releasing area.
L is the length from the center position of the locking claw in the thickness direction of the vertical claw to the tip of the horizontal claw, a is the shortest horizontal distance between the inclined edge of the vertical claw and the horizontal claw, a is the inclination angle of the inclined edge θ, and arc-shaped. Let r be the radius of the edge
Assuming that half of the thickness of the vertical claw is s, the locking amount factor is an axial distance of a portion where the tip of the horizontal claw overlaps the edge of the locking hole in a state where the locking hole is engaged with the locking claw. K is the following equation (6).
When the width of the horizontal nail is d, the width of the light-shielding paper in the width direction is α, and the width of the opening in the direction perpendicular to the width direction is β, the release area is 2L <α ≦ 6L and d <
Since β ≦ 2d is satisfied, the engagement area can be securely engaged with the locking claw, the spool and the light-shielding paper can be reliably locked, and the locking claw is moved to the release area to thereby enable the light-shielding paper Can be easily separated from the spool.

[0071]

(Equation 6)

Further, since a mark indicating the presence of the locking claw is provided on the outer peripheral surface of the winding shaft on which the locking claw is formed, the spool with the locking claw can be easily distinguished from the conventional spool.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a locking claw and a locking hole according to the present invention.

FIG. 2 is a perspective view showing the appearance of a photographic roll film.

FIG. 3 is a plan view of a photo film with light-shielding paper.

FIG. 4 is a side view of the spool showing a state in which a locking hole of a light-shielding paper is engaged with a locking claw of the spool.

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is an explanatory diagram showing a state in which the leading end of the light shielding paper is inserted into a slit of a spool.

FIG. 7 is an explanatory view showing a state in which the spool is slightly rotated from the state shown in FIG. 6 and the locking hole is engaged with the lateral claw of the locking claw.

FIG. 8 is an explanatory diagram showing a state in which the lateral claw has moved to a release area of the locking hole.

FIG. 9 is an explanatory view showing a state in which the engagement between the locking claw and the locking hole is released.

FIG. 10 is an explanatory view showing another embodiment of the locking hole.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Photo roll film 2 Spool 2a Shaft 3 Photo film 4 Shading paper 4a Tip 5 Photo film with shading paper 7 Slit 7a, 7b Opening 9, 31 Locking hole 9a Engaging area 9b Release area 10 Mark 15 Locking Claw 15a Vertical claw 15b Horizontal claw 16 Holding rib

Claims (3)

[Claims] 1. A strip-shaped photographic film having a light-shielding paper fixed at least at a front end thereof, and a slit formed in an axial direction,
A spool having a cylindrical winding shaft around which the photographic film is wound in a roll shape, wherein at least one locking hole is formed at a leading end of the light-shielding paper; On one wall, a pair of inclined edges are formed so as to face each opening of the slit, and a trapezoidal plate-like vertical claw is formed on both sides near the top so as to extend in the axial direction of the spool. A pair of lateral claws, forming a locking claw engaged with the locking hole, and a pressing rib for pressing the light-shielding paper inserted into the slit against the one wall on the other wall. In the photographic roll film, the locking hole is provided with an engaging area where the edge on the leading end side of the light-shielding paper engages with the locking claw, and the engaging area is connected to the photographic film side of the engaging area. Release area where engagement with claw is released And a roll film for photography. 2. A strip-shaped photographic film having a light-shielding paper fixed at least at a front end thereof, and a slit formed in an axial direction,
A spool having a cylindrical winding shaft around which the photographic film is wound in a roll shape, wherein at least one locking hole is formed at a leading end of the light-shielding paper; On one wall, a pair of inclined edges are formed so as to face each opening of the slit, and a trapezoidal plate-like vertical claw is formed on both sides near the top so as to extend in the axial direction of the spool. A pair of lateral claws, forming a locking claw engaged with the locking hole, and a pressing rib for pressing the light-shielding paper inserted into the slit against the one wall on the other wall. In the photographic roll film, the engaging hole is provided at the leading end side of the light-shielding paper, and at least an edge on the leading end side of the light-shielding paper has an arc shape and engages with the engaging claw, and The photo film side of this engagement area And a release area in which engagement with the locking claw is released. The engagement area has a length from a center position in the thickness direction of the vertical claw to a tip of the horizontal claw, L, When the shortest horizontal distance between the inclined edge of the vertical nail and the horizontal nail is a, the inclination angle of the inclined edge is θ, the radius of the arc-shaped edge is r, and half the thickness of the vertical nail is s, the engagement is performed. In the state where the area is engaged with the locking claw, the locking amount factor K, which is the axial distance of the portion where the tip of the horizontal claw overlaps the edge of the engaging area, is expressed by the following equation 1 and K ≧ 0.5 mm
When the width of the horizontal nail is d, the opening width in the width direction of the light-shielding paper is α, and the opening width in the direction orthogonal to the width direction is β, the release area is 2L <α ≦ 6L and d <β A photographic roll film characterized by satisfying ≦ 2d. (Equation 1) 3. The photographic roll film according to claim 1, wherein a mark indicating the presence of the locking claw is provided on an outer peripheral surface of the winding shaft on the side where the locking claw is formed.