JPH11288065A - Photographic roll film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the leading end edge of the leading end part of a light shielding paper from being caught by the catch of a spool, as to a photographic roll film. SOLUTION: The central part of the leading end part of the light shielding paper 4 arranged on the base surface side of the photographic film is formed narrower by the prescribed length from the leading end edge, then, a narrow part 9 is formed. Besides, a catch hole is formed in the leading end part of the paper 4. As for the spool 2, the catch 15 which is engaged with the catch hole is formed on one wall 12a constituting a slit 7 formed on a shaft part 2a, The catch 15 is constituted of a vertical pawl 15a planted on the wall 12a and a pair of horizontal pawls 15b formed on the top part. In the case the vertical loop stiffness of the paper 4 of about 60 mm width is >=200 g/mm and <=400 g/mm, the width of the narrow part 9 is controlled to be >= 11 mm and <=23 mm, then, the gutter-like curling of the narrow part 9 is lessened, then, the leading end edge of the narrow part 9 is prevented from being caught by the horizontal pawl 15b, in the case of inserting the narrow part 9 into the slit 7.

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 a light-shielding paper having a locking hole formed at a leading end thereof and a spool having a locking claw for engaging with the locking hole of the light-shielding paper. The present invention relates to a formed photographic roll film.

[0002]

2. Description of the Related Art As a photographic roll film, 120-type and 220-type roll films are conventionally known. However, simply inserting the leading end of a light-shielding paper into a slit of a spool and rotating the spool blocks light from the spool. Since the paper is easy to fall off, the operation of winding the light-shielding paper around the spool when loading the film requires familiarity and cannot be easily handled by anyone.

Accordingly, the present applicant has disclosed in Japanese Patent Laid-Open No. 9-1851.
As disclosed in JP-A-51, a locking hole is formed at the leading end of the light-shielding paper, and a locking claw that engages with the locking hole of the light-shielding paper is formed on the inner wall surface of the slit of the spool. We have proposed a photo roll film in which the light-shielding paper can be easily and securely locked to the spool simply by inserting the tip of the roll into the slit of the spool. The locking claw is provided with a pair of horizontal claws extending in the spool axis direction at the distal end thereof. After the locking claws enter the locking hole and are relatively moved away from the light-shielding paper by rotation of the spool, the horizontal claws Is caught on the edge of the locking hole so that it does not come off easily.

[0004]

However, in the above proposal, when the leading end of the light-shielding paper is inserted into the slit of the spool, the leading end of the light-shielding paper curls in a gutter shape due to the curl of the light-shielding paper. There is a case where the hook is caught by the pawl, particularly the lateral pawl, and cannot be inserted smoothly.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a photographic roll film in which a leading edge of a light-shielding paper is prevented from being caught on a locking claw of a spool when a leading end of the light-shielding paper is inserted into a slit of a spool. .

[0006]

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 winding shaft around which the photo film is wound in a roll shape, wherein the center of the leading end of the light-shielding paper is formed narrower by a predetermined length from the leading edge, and at least one
A plurality of locking holes, and one of the upper and lower walls constituting the slit is provided with a locking claw engaged with the locking hole. 6
Vertical loop stiffness at 0 mm width is 200 g / mm or more 4
When the thickness is not more than 00 g / mm, the width of the narrower end edge is set to 11 mm or more and 23 mm or less.

[0007]

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.
Is fixed with an adhesive tape 6, but the front end 4a of the light-shielding paper 4 is not folded unlike the conventional 120 type. Thereby, in the insertion operation into the slit 7 formed at the center of the shaft portion 2a, the front end portion 4a of the light-shielding paper 4 is less likely to buckle, and the insertion force is easily transmitted to the front end portion 4a.

The outer surface of the light-shielding paper 4 which becomes the outer side when being wound around the shaft portion 2a is a printing surface on which a manufacturer name, a 120 type name and the like are printed, and the inner rear surface is provided with a black layer for light-shielding. Black surface. The shaft 2a
Are formed at both ends thereof, 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 with light-shielding paper 5 is removed from the spool 2 and straightened.
Thus, the photographic film 3 is superimposed on the central portion of the long light-shielding paper 4 so that the base surface is aligned with the black surface of the light-shielding paper 4, and one end is joined to the light-shielding paper 4 by the joining tape 8.

The front end 4a of the light-shielding paper 4 and the rear end 4b which is on the spool side when not in use are provided with slits 7 of the spool 2.
The center of each tip side has a predetermined length,
For example, it is formed to be narrow by about 10 mm, and from the roots of the narrow portions 9 and 10 to both edges of the light-shielding paper 4 are inclined edges 4c and 4c.
4d, 4e, and 4f. In this embodiment,
Width D ₁ of the light-shielding sheet 4 is 60mm for example, as will be described later in detail, the width D ₂ of 10 is as 11mm~23mm C., for example 20 mm. A locking hole 11 is formed at the center of the base of the narrow portion 9 so as to be engaged with a locking claw of a take-up spool described later.

The spool 2 is connected to one opening 7 of the slit 7.
4A shown in FIG. 4A, the front end 4a of the light-shielding paper 4 is engaged with the shaft 2a of the spool 2 by engaging with the engaging hole 11 at the center of one wall 12a forming the slit 7. T
A locking claw 15 in the shape of a letter is protrudingly provided. This locking claw 1
5 is a trapezoidal plate-shaped vertical claw 1 that stands vertically from the wall 12a.
5a and a pair of lateral claws 15b extending in the axial direction from both sides near the top. A pair of holding ribs 16 for pressing the light-shielding paper 4 against the locking claws 15 are formed at equal intervals around the locking claws 15 on the other wall 12 b constituting the slit 7. The interval D ₃ between the holding ribs 16 is slightly larger than the width D _{2 of the} narrow portion 9, and the narrow portion 9 is guided between the holding ribs 16 to the locking claw 15.

In FIG. 1 showing a cross section taken along line II of FIG. 4, both 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. Similarly, the narrow portion 9 of the light-shielding paper 4 can be guided toward the locking claw 15 from either side of the openings 7a and 7b.

The inclined edge 18 of the vertical claw 15a of the locking claw 15
The angle has two stages. The inclined edge 18a on the top is
If the inclination angle θ is large, the light-shielding paper may be held at the switching point with the sloping edge 18b, so the inclination angle θ is preferably 45 ° or less. Also, if the inclination angle θ is too small, the locking property with the locking hole 11 deteriorates.
0 ° or more is preferred.

In FIG. 5, when the narrow portion 9 of the light-shielding paper 4 is inserted from the opening 7a of the slit 7, the narrow portion 9 is guided on both sides by a holding rib 16 as shown by a two-dot chain line. The center of the light-shielding paper 4 in the width direction is
Is inserted straight toward the locking claw 15 without deviating from the center in the longitudinal direction. The narrow portion 9 rides on the inclined edge 18 of the vertical claw 15a, moves along the inclined edge 18 while curling into a gutter shape by receiving resistance from the inclined edge 18, and climbs over the top of the vertical claw 15a.

It is known that the gutter-like curl is caused by the curl of the light-shielding paper 4. However, since the photographic roll film 1 is provided in a roll form as shown in FIG.
It is practically impossible to prevent the curl, and a gutter-like curl almost always occurs. Further, the trough-shaped curl makes it easier for the leading edge of the narrow portion 9 to be caught by the edge of the lateral claw 15b, as described later in detail.

As the insertion of the light-shielding paper 4 proceeds, the inclined edges 4c and 4d on both sides following the narrow portion 9 are pressed by the pressing ribs 16, so that the light-shielding paper 4 is pressed against the locking claws 15 side. When the light-shielding paper 4 is inserted to a position where the center of the locking hole 11 substantially coincides with the center of the locking claw 15, the locking claw 15 enters the locking hole 11 as shown by a solid line. After this,
When the spool 2 is rotated, the light-shielding paper 4 is pulled in a direction in which the light-shielding paper 4 is pulled out of the slit 7, and the light-shielding paper 4 moves toward the wall 12b along the inclined edge 18a and tries to come off from the locking claw 15. As shown in FIG. 6, the locking holes 1 are formed at the corners of the side claws 15b.
1 is hooked, and the light-shielding paper 4 is locked by the locking claw 15. When the insertion direction of the narrow portion 9 into the slit 7 deviates from the center of the slit 7 in the longitudinal direction, the inclined edge 4
The c and 4d are guided by the edge of the slit 7 and the trajectory is corrected.

FIG. 7 is an enlarged view showing a state in which the locking hole 11 is locked to the locking claw 15.
A substantially triangular portion 20 indicated by hatching overlapping the corner of 5b
Is defined as a locking amount factor K. Then, assuming that the radius of the locking hole 11 is r, half of the thickness of the vertical claw 15a (hereinafter referred to as the thickness of the vertical claw 15a) is s, and the length of the horizontal claw 15b (half of the length between the tips) is L. Lock hole 11
From the engagement end P between the edge of the vertical claw 15a and the edge 21 of the horizontal claw 15b
The distance f to is expressed by the following equation 1.

[0018]

(Equation 1)

By transforming the equation (1), the locking amount factor K is expressed by the following equation (2).

[0020]

(Equation 2)

The radius r of the locking hole 11 is desirably about 3 mm or more due to restrictions on the production of the drilling blade. Further, as the diameter of the trimming dust is smaller, problems such as adhesion to the product due to static electricity are more likely to occur. Therefore, it seems that the larger the radius r of the locking hole 11 is, the larger the radius r of the locking hole 11 becomes. Becomes insufficient. As a result of an experiment, it was found that it is preferable that K ≧ 0.5 mm, and more preferably K ≧ 0.8 mm.

When it is desired to increase the radius r and increase the locking amount factor K, as is apparent from Expression 2, as shown in FIG.
It is necessary to increase the length L of 5b, so that the leading edge and the horizontal claw 15b are easily caught by the gutter-shaped curl of the narrow portion 9 easily. For this reason, it has been found that the radius r of the locking hole 11 preferably satisfies 2.8 mm ≦ r ≦ 6 mm. In addition, the thickness s of the vertical nail 15a is 0.5 m due to moldability such as the ease of resin flow and sink marks.
It is preferable that m ≦ s ≦ 0.9 mm.

In FIG. 1, a narrow portion 9 of the light-shielding paper 4 is shown.
Is inserted into the opening 7a of the slit 7, the narrow portion 9 goes to the top along the inclined edge 18a of the vertical claw 15a while riding on the inclined edge 18a. During this time, since the narrow portion 9 of the light-shielding paper 4 curls in a gutter shape, the leading edge may be hooked on the end of the horizontal claw 15b. From the edge 21 of the horizontal nail 15b to the vertical nail 15
Assuming that the shortest horizontal distance to the inclined edge 18a of a is a, the horizontal claw 1 extends from the leading edge of the narrow portion 9 in contact with the inclined edge 18a.
The distance to the edge 21 of 5b is asin θ. When the light-shielding paper 4 is locked by the locking claw 15, the edge of the locking hole 11 is pulled toward the top and slightly deformed, so that asin θ is substantially equal to f in the above formulas 1 and 2. Therefore, when asinθ is substituted for Equation 2 instead of f, the following Equation 3 is obtained.

[0024]

(Equation 3)

As described above, the cause of the narrow portion 9 of the light-shielding paper 4 being caught by the locking claw 15 is the gutter-like curl of the narrow portion 9. Therefore, in FIG. 8 showing a state in which the narrow portion 9 of the light-shielding paper 4 curled in a gutter shape is caught on both ends of the horizontal claw 15b, the distance between the center of the gutter-shaped curl and the end of the horizontal claw 15b is represented by CR.
Then, this CR, the length L of the side claw 15b, and asin θ
And the following equation 4 holds. In addition,
FIG. 8 is a view showing the locking claw 15 from the opening 7a. However, the locking claw 15 is not viewed parallel to the walls 12a and 12b, but obliquely along the inclined edge 18 from a position close to one wall 12a. Is what I saw.

[0026]

(Equation 4)

By transforming the equation (4), CR can be expressed by the following equation (5).

[0028]

(Equation 5)

As is apparent from Equation 5, the value of CR is uniquely determined by the value of asin θ and the value of L. If the radius BR of the gutter-shaped curl is smaller than CR, the width of the light-shielding paper 4 Since the narrow portion 9 is caught by the lateral claw 15b and is not caught if it is large (the gutter-like curl becomes loose),
CR is called a catch coefficient. That is, the condition that the narrow portion 9 of the light-shielding paper 4 is not caught on the horizontal claw 15b is expressed by the following Expression 6.

[0030]

(Equation 6)

The longitudinal loop stiffness of currently marketed light-shielding paper is measured, and high stiffness, low stiffness, and intermediate stiffness are selected. The slits of the spool are changed while changing the width D ₂ of each narrow portion. Table 1 to 9 show the results. In addition, the value of a and H
Is 1.3 for each of types 1 to 3 having different values of
What changed between 0.1 mm and 2.5 mm by 0.1 mm was prepared. In addition, the insertability, ○, when the end edge of the narrow portion can be inserted without being caught on the side nail at the time of insertion,
A case where there is a probability of approximately 50% is indicated by △, and a case where the device is always caught is indicated by ×, and each intermediate case is represented by ○ to △,
〜 To ×.

The vertical loop stiffness means that a loop having a diameter of 10 mm is formed with a light-shielding paper having a width of 60 mm, and the loop is formed by a length of 2 m.
This is a measurement of the stress in the length direction of the light-shielding paper when m is compressed and then returned by 1 mm. The light-shielding paper having high rigidity, the light-shielding paper having low rigidity, and the light-shielding paper in between these are light-shielding paper A made of commercially available brownie film (Neopan SS) and light-shielding paper B made of professional 160NS.
Professional NS (six shots) of light-shielding paper C was selected. In addition, the average value of each stiffness when the measurement was performed 5 times each was 382.8 g / mm and 161.6 g / m, respectively.
m, 211.2 g / mm.

[0033]

[Table 1]

[0034]

[Table 2]

[0035]

[Table 3]

[0036]

[Table 4]

[0037]

[Table 5]

[0038]

[Table 6]

[0039]

[Table 7]

[0040]

[Table 8]

[0041]

[Table 9]

As is clear from Tables 1 to 9, the areas below the oblique lines shown in each table have good insertability,
Vertical loop stiffness of 60 mm width is 200 g / mm or more and 400
g / mm or less, the width D of the narrow portion
It can be seen that when ₂ is 11 mm or more and 23 mm or less, the insertability becomes good.

The operation of the photographic roll film 1 configured as described above will be described. When inserting the narrow portion 9 of the light-shielding paper 4 into the opening 7a of the slit 7, if the black surface of the light-shielding paper 4 is facing the wall 12a, the narrow portion 9 is formed by the curl of the light-shielding paper 4. Facing downwards. For this reason, after the narrow portion 9 contacts the inclined edge 18 of the vertical claw 15a, the narrow portion 9 forms a gutter-shaped curl toward the top along the same. However,
The light-shielding paper 4 has a vertical loop stiffness of 200 g / mm or more 4
00 g / mm or less (when the width D _{1 of the} light-shielding paper is 60 mm)
For example, light-shielding paper A is used, and the width D _{2 of the} narrow portion is 2
Since it is 0 mm, the radius BR of the gutter-shaped curl of the narrow portion 9 is sufficiently large so that the leading edge of the narrow portion 9 does not catch on the lateral claw 15b. You can cross the top of

As shown in FIG. 5, when the inclined edges 4c and 4d abut on both ends of the slit 7, the center of the locking hole 11 coincides with the center of the locking claw 15, and The outline of the lateral claw 15b is included, and the holding rib 16
Is pressed against the wall 12a by the
Is dropped into the locking hole 11. Next, when the spool 2 is rotated, the light-shielding paper 4 is relatively moved in a direction to come out of the slit 7. Thereby, the edge of the locking hole 11 moves along the inclined edge 18a of the vertical claw 15a, and both ends of the horizontal claw 15b engage with the edge of the locking hole 11 as shown in FIG. Is locked to the spool 2.

The paper support used for the light-shielding paper used in the present invention is not particularly limited. In addition to a paper support mainly made of natural pulp, natural pulp and synthetic fibers or synthetic 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, latexes, emulsions, and additives such as an antistatic agent by various coating methods, spraying, tab size, size press and the like.

The water-soluble polymer is described in JP-A-1-26
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 latexes and emulsions, petroleum resin emulsions, styrene-acrylic acid-acrylate copolymers, styrene-acrylic acid-butadiene copolymers, ethylene-vinyl acetate copolymers, 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 to completely block light or a light-shielding layer is provided in a later step, black paper may be used for the light-shielding paper support as an auxiliary light-shielding layer. 1 to 15% by weight of furnace carbon black having a particle size of 15 to 80 μm, and an average particle size of 0.1 to 5 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 an 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 caused by the locking claw is 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 photographic light-sensitive material melting packaging material of the present invention, there is no fogging, does not affect the increase / decrease of the photosensitivity, 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.

These light-shielding substances are added in an amount of 4 to 30% by weight.
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 thermally melted 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 final method, a uniform film is formed into a film having a thickness of 20 μm 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.

Further, generally known coloring agents are 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 to protect the gloss of the surface and the printed portion of 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, a polystyrene resin is generally used in view of strength, heat resistance, dimensional stability, appearance and the like, and a synthetic rubber such as butadiene rubber is used as a styrene-based 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 to be 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, etc. 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 monomers are used alone without using a solvent or dispersant, which is 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 the light-shielding paper, it must have light-shielding properties, and representative examples of light-shielding substances therefor 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, 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 based on 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 was
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 a dispersant for the light-shielding substance, one or more selected from low-molecular-weight styrene-based polymers, polyethylene wax, polypropylene wax, and 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 sliding property with respect to the light-shielding paper side end, and to further improve the effect of preventing the thickening of the roll. 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 acid amide-based lubricants; Armide HT (Lion Oil), Alflo S-10 (Japan) 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 blended with 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.

In the embodiment described above, the leading edge of the light-shielding paper is linear, but may be, for example, an arc.

[0083]

As described above, according to the photographic roll film of the present invention, when the vertical loop stiffness at a width of 60 mm of the light-shielding paper is 200 g / mm or more and 400 g / mm or less, the light-shielding paper is formed to be narrow. The width of the leading edge is 11 mm or more and 23 mm or less, so that when the leading end of the light-shielding paper is inserted into the slit of the spool, the gutter-like curl at the leading end is loosened, and the leading edge of the leading end is engaged with the locking claw of the spool. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along line II of FIG. 4 showing a relationship between a locking claw according to the present invention and a narrow portion.

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

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 an explanatory view showing a state where a narrow portion is inserted into a slit of a spool.

FIG. 6 is an explanatory view showing a state in which the spool rotates slightly from the state shown in FIG. 5 and the locking holes are engaged with the horizontal claws of the locking claws.

FIG. 7 is an explanatory diagram showing an enlarged state of engagement between a locking claw and a locking hole in FIG. 6;

FIG. 8 is an explanatory view schematically showing a state in which a light-shielding paper curled in a gutter shape is caught on an end of a horizontal claw.

[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 Slits 7a and 7b Opening 9 Narrow part 11 Locking holes 12a and 12b Wall 15 Locking claw 15a Vertical Claw 15b Side claw 16 Holding rib 18, 18a, 18b Inclined edge

Claims (1)

[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 winding shaft around which the photo film is wound in a roll shape, wherein the center of the leading end of the light-shielding paper is formed narrower by a predetermined length from the leading edge, and at least one A plurality of locking holes, and one of the upper and lower walls forming the slit is provided with a locking claw engaged with the locking hole. Vertical loop stiffness at 60 mm width is 200
A roll film for photography, wherein the width of the narrow edge formed in the range of g / mm to 400 g / mm is 11 mm to 23 mm.