JPH08314069A - Photographic film cartridge - Google Patents

Abstract

PURPOSE: To make a cartridge have a shape that a lip being undercut due to forcible extraction is not deformed and to improve durability in a high temperature environment. CONSTITUTION: A thin disk-like flange 20 is attached to both ends of a spool shaft being the part of the photographic film cartridge. The lip 21 for preventing the photographic film from being loosened is protrusively molded on the outer periphery of the flange 20. Since the lip 21 is inclined so that the root of the inner peripheral surface 21a may be separated from the outermost periphery of the photographic film in order to reduce frictional resistance with the photographic film, it becomes undercut in the case a metallic mold for injection molding has split mold constitution. Then, an angle θ1 is inclined at the angle of 2 deg. to 10 deg. at which the forcible extraction is permitted. By thinning at least one corner part among the respective corner parts 20e to 20g with respect to the thickness (at) of a plate part 20b, resin having the large value of the modulus of bending elasticity is used and the durability under the high temperature environment is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographic film cartridge which sends a photographic film to the outside of a cartridge body by the rotation of a spool shaft, and more particularly to a photographic film cartridge in which flanges are attached to both ends of a spool shaft around which the photographic film is wound. This is about the photo film patrone.

[0002]

2. Description of the Related Art For the purpose of simplifying the loading of a photographic film cartridge into a camera, improving the working efficiency in a developing station, and improving the handling of the photographic film cartridge, the photographic film is wound up to the spool even up to its tip. The photo film patrone, which is stored in the patrone body, is loaded into the camera, and when the spool is rotated, the tip of the photo film is sent out from the opening provided in the patrone body to the outside, U.S. Pat. No. 4,834,306. Description, No. 4832275, JP-A-3-3764
It is proposed in Japanese Patent Publication No. 5 and the like.

In such a photographic film cartridge,
To prevent the photo film from winding around inside the cartridge body when the spool is rotated, the flanges fixed or rotatably attached to both ends of the spool are devised. The pair of flanges described above prevent loosening of the photographic film by wrapping the outermost periphery of the photographic film roll with a tongue-shaped lip slightly protruding in the direction opposite to each other on the outer peripheral edge of each of the flanges. Then, the tip of the film located on the outermost periphery of the photographic film wound on the spool is separated toward the opening formed in the cartridge body by the separation claw integrally provided in the cartridge body.

When the photographic film is sent out, it is necessary to partially release the regulation for loosening the photographic film by the lip. As a releasing method, a pair of separating claws are provided on both sides in the width direction of the film, and a pair of separating claws are partially deformed in a direction in which the lips are separated from each other, and a single separating claw is used. There is a method in which the tip of the photographic film partially deforms the pair of lips at the edges of the photographic film so as to separate them from each other.

In the photographic film used in the present invention, triacetate having a thickness of 0.07 to 0.15 mm, polyester, polyphenylene naphthalate, polycarbonate or the like is used as a support, and the surface thereof is selected according to the type of the photographic film. Photosensitive emulsion is applied. The back layer is
Although it is not particularly required to be provided, a magnetic recording layer, an antistatic agent, a conductive substance, a layer formed of nitrocellulose, diacetylcellulose, triacetylcellulose, butyral resin, gelatin, polycarbonate or the like to which a lubricant or the like is added can be used. .

Since such a photographic film has high rigidity, it has a large winding loosening force when wound in a roll shape. If this force is large, the lip is deformed in the expanding direction and it is not possible to prevent the photographic film from being loosened. Therefore, in Japanese Utility Model Laid-Open No. 6-68047, the lip is reinforced by uniformly increasing the thickness of the lip.

Further, inside the cartridge body, the frictional resistance generated between the outermost periphery of the photographic film and the inner peripheral surface of the lip becomes large, and this portion is easily rubbed and abraded, and powder is generated by the abrasion, It may be sent out from the film cartridge along with the film, contaminating the camera and imprinting it on the image. Therefore, in order to reduce such friction as much as possible, in JP-A-2-18545 and JP-A-6-68047, the lip is arranged so that the inner side of the lip is away from the outermost periphery of the photographic film. A flange having a slanted cross section has been proposed.

Since such a flange is constantly deformed and rotated, it must be thin and have appropriate elasticity and wear resistance. In order to give the flange such characteristics, it is necessary to first select a material. Moreover, when selecting this material, it is necessary to consider the molding method.
A material and a molding method which are preferable in consideration of both of them are disclosed in JP-A-4-251841 and JP-A-6-14.
No. 8808. In those described in these publications, a thin polyethylene resin sheet (thickness 0.3 mm) formed by extrusion is softened by heating and thermoformed by vacuum or pressure forming, and then punched into inner and outer shapes in a punching step to form a flange. I am trying to do it.

By the way, in the above-mentioned thermoforming of the flange, a heating step of heating the resin sheet drawn out from the roll, a forming step of subjecting the heated sheet to vacuum or pressure forming, and a punching step of punching a formed portion of the sheet to obtain a flange. Since various processes such as a sheet collecting process and a sheet collecting process are required, the equipment tends to be large-scale and the equipment cost becomes high. In addition, a surplus sheet is generated after punching, resulting in waste of material cost. Therefore, it is desired to form the flange by injection molding, which enables high-speed, large-volume, automated production, and can change the thickness of each part freely.

[0010]

When a flange is formed by injection molding, a mold is constructed by dividing the inside (the lip protruding side) and the outside of the flange into a movable mold and a fixed mold, respectively. In terms of cost, it is most desirable to form the flange by a simple back-and-forth movement in which the movable die is moved along the axial direction of the spool. However, as mentioned above,
If the lip has a slanted cross-sectional shape, it may be undercut and it may be difficult to take out the flange. For such undercut, there is a method of moving the side core in a direction orthogonal to the longitudinal movement to release the mold, but this makes the mold complicated and expensive, and the cycle time becomes long. Therefore, the molding efficiency is lowered and the mold is damaged quickly. Further, as another method, a method of taking out a molded product while rotating the mold, which is performed with a circular molded product such as a flange, has a drawback that the mold becomes complicated and expensive.

The photographic film cartridge may be left in a high temperature environment. Therefore, it is necessary to form the flange with a resin having durability that can withstand even a high temperature environment. However, a resin having a higher heat denaturation temperature has a higher flexural modulus value, and thus may not be able to provide a desired elasticity to the lip.

The present invention has been made to solve the above-mentioned problems, and when the flange is formed by injection molding, the undercut lip is devised so that it can be easily released from the mold, and the bending elastic modulus value is increased as much as possible. The objective is to provide a photographic film cartridge designed so that it can be molded with a large resin.

[0013]

To achieve the above object, a spool shaft around which a photographic film is wound, a pair of flanges attached to the spool shaft, and an outermost peripheral end portion of the photographic film are wrapped. As described above, in a photographic film cartridge having a lip that is integrally formed on at least one outer periphery of the flange and regulates slack of the photographic film, the inner peripheral surface of the lip is the inner peripheral surface of the outer peripheral surface of the photographic film. The root side is inclined at an angle of 2 to 10 degrees so as to be separated from the outermost periphery of the photographic film, and the thickness of the lip is formed so as to increase from the root toward the tip. In this way, since the angle of the inner peripheral surface of the lip is regulated to an angle of 2 to 10 degrees, deformation does not occur even if it is forcibly pulled out, and the thickness of the lip is increased from the root to the tip, so the strength is increased. It is possible to reliably prevent the photographic film from being loosened. In the case of a mold having two halves, it is preferable to provide a draft on the outer peripheral surface of the lip, and the outer peripheral surface of the lip may be inclined at an angle of 0 to 3 degrees in the direction opposite to the inner peripheral surface.

Further, the photographic film is provided with a pair of flanges attached to both ends of a spool shaft around which the photographic film is wound in a roll shape, and a bottom portion provided with an opening for inserting the spool shaft, and the outer periphery of the bottom portion of the photographic film are attached to the photographic film. A rising part bent in the winding direction, a flat plate part bent from the tip of the rising part in a direction away from the spool shaft, and a bending part in the winding direction of the photo film from the outer periphery of the flat plate part. In the invention of the photographic film cartridge in which at least one flange of the pair of flanges is formed by injection molding in a cross-sectional shape provided with a lip for wrapping the outermost peripheral end of the photographic film to regulate the looseness of the photographic film, the injection molding is performed. The flange has a first corner portion between the bottom portion and the rising portion and a second corner portion between the rising portion and the flat plate portion. Over portion, and further, in which at least one corner portion thickness of each corner between the third corner portion between the base of the flat plate portion and the lip formed by thin relative to the flat plate portion.

As a result, a resin having a large flexural modulus can be used. The thickness of the flat plate portion is 0.
11-0.25 mm is desirable. The thickness of the thinned corner portion is preferably 0.07 mm or more and 90% or less of the thickness of the flat plate portion. Furthermore, the radius of roundness inside and outside the thinned corner is 0.11 to 0.4.
mm is preferred. Furthermore, the flexural modulus of the resin used is preferably 13000 to 30000 Kg / cm ² .

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, a cartridge main body 1
0 is composed of an upper case 11 and a lower case 12 each made of plastic. A spool 13 is rotatably housed inside the cartridge main body 10, and a pair of flanges 19 and 20 are attached to both ends of the spool 13.
The photo film 14 is wound around the shaft portion of the spool 13 between the rolls.

Both the upper and lower cases 11 and 12 are made by resin molding, and the molding material thereof has a small frictional resistance with the flange, can sufficiently withstand a drop impact, and is hard to be thermally deformed. Required. Specifically, styrene resin, polycarbonate resin, ABS resin, polyester resin, nylon resin, modified polyphenylene ether resin, polyacetal resin, polypropylene resin, polyethylene resin, methylmethacryl resin, Teflon resin, polyphenylene sulfide resin, or these resins. The mixed resin of is mentioned. Among these, modified PPE of 6 nylon, 66 nylon, or 12 nylon is particularly preferable in terms of heat resistance, slipperiness, and moldability. Further, modified PPE containing 40 to 60% of nylon is particularly preferable.

Each of the upper and lower cases 11 and 12 has a substantially semi-cylindrical shape, and a port portion 15 is formed so as to project in a part thereof. Upper case 11 and lower case 12
When fitting and, the light shielding lid 16 is rotatably fitted in the port portion 15. A flat film passage 17 is formed in the light-shielding lid 16 and serves as a passage for the photographic film 14 delivered from the inside of the cartridge body 10 when the light-shielding lid 16 is rotated to the open position. When the light-shielding lid 16 is rotated to the closed position, the opening (photo film entrance / exit) formed at the tip of the port portion 15 is completely closed, and the inside of the cartridge body 10 is in a light-shielding state.

A projection 18 is formed at the back of the port portion 15 of the lower case 12. This protrusion 18 is for the spool 1
This is a guide for picking up the leading end portion of the photographic film 14 wound around 3 and guiding it to the film passage 17. Openings 19a and 20a are formed in the flanges 19 and 20, respectively. By inserting the spool 13 into the openings 19a and 20a, the spools 13 are fitted into predetermined positions,
The spool 13 is rotatably attached to the spool 13.

The flanges 19 and 20 have an outer diameter of 15 mm or more and a maximum projected area of 100 mm ² or more in which the contour is circular. The flanges 19 and 20 are injection-molded with a resin having excellent fluidity in the mold. Has been formed. These flanges 19,
A lip 21 is integrally formed on the outer circumference of 20. 2 (A) and 2 (B) show the flanges 19 and 20, each lip 21 projects so as to face the other flange 19 and 20, and is wound around the spool 13. The outermost periphery of the photographic film 14 is partially wrapped from both end surfaces.

The lip 21 is reinforced by increasing its thickness in order to prevent the photographic film 14 from being loosened.
In addition, in order to reduce friction generated between the outermost periphery of the photographic film 14 and the inner peripheral surface 21a of the lip 21, a cross-sectional shape inclined so that the inner side of the inner peripheral surface 21a is separated from the outermost periphery of the photographic film 14. Has become.

The flanges 19 and 20 have lips 21 on the outer circumference.
The flat plate portions 19b, 20b from which the
The bottoms 19c and 20c forming the a and 20a are the lip 2
The cross-sectional shape is one step recessed in the direction opposite to the protruding direction of 1. The horizontal length (symbol SH shown in FIG. 2) from the outer side surfaces of the flat plate portions 19b and 20b to the tip of the lip 21 is the protruding length of the lip 21, for example, 1.1.
It is set to be about 1.7 mm.

A collar 22 is integrally provided on the outer periphery of the lip 21. The collar 22 acts as a reinforcement for preventing the lip 21 from spreading.

A plurality of locking holes 25 are formed in the flange 20 on a surface 20b having the opening 20a so as to surround the opening 20b and are separated by a predetermined distance. These engagement holes 25 engage with each other when the spool 13 and the spool 13 are rotated in the film feeding direction, and the flange 20 is forcibly rotated. In addition, the spool 13 in the film winding direction
When is rotated, the flange 20 can freely rotate without the clutch claw 24 and the locking hole 25 of the flange 20 being locked. Also, the other flange 19 remains rotatable with respect to the spool 13. A fan-shaped display plate 23a is integrated with the use display part 23, and the state of use of the photographic film cartridge can be determined by checking its position through a display window formed in the cartridge body 10. There is.

Side ribs 26 are provided on the inner side walls of the upper case 11 and the lower case 12 to prevent the flanges 19 and 20 from expanding. On the spool 13,
A fan-shaped plate 27 is fixed to the outside of the portion to which the flange 19 is attached, and a bar code 28 is formed on the surface by stamping. The barcode 28 is radially written around the rotation axis of the spool 13, and is photoelectrically detected inside the camera or the like through a window 29 formed on the side surface of the cartridge body 10 when the spool 13 is rotated. As a result, it is possible to electrically detect the type information of the photographic film 14 stored in the main body 10 of the cartridge, the information on the number of photographed images, and the like. The label 30 attached to the cartridge main body 10 displays a film type display, a unique number of the cartridge, and the like.

The spool lock part 31 locks the spool 13 so as not to rotate when the light-shielding lid 16 is rotated to the closed position. This lock is released when the light shielding lid 16 moves to the open position. Reference numeral 32 denotes a lock pole integrally formed with the upper case 11, and the light shield lid 16 is locked by the lock pole 32 when it is rotated to the closed position. This lock is released when the photographic film cartridge is set in a device such as a camera or a display device by the opening mechanism of the light shielding lid 16 provided in these devices. Instead of using the light-shielding lid 16, it is also possible to form a film passage in the inner wall of the port portion 15 and attach a telemp to the film passage to keep the inside of the cartridge body 10 light-tight.

As shown in FIG. 3, when the photographic film 14 is completely wound inside the cartridge body 10, the outermost periphery of the photographic film 14 is partially wrapped by the lips 21 and 21 of the flanges 19 and 20. Therefore, loosening of the spool 13 is prevented. This allows
When the spool 13 rotates in the feeding direction of the photo film 14, the photo film 14 rotates together with the spool 13.

The side ribs 26 provided on the inner side walls of the upper and lower cases 11 and 12 regulate the flanges 19 and 20 so that the flanges 19 and 20 do not spread out from each other. , Side ribs 26 facing each other
The distance between them is widened. For this reason, after the tip of the photographic film 14 is scooped up by the projection 18, when the film passage 17 is proceeded to, the flanges 19 and 20 spread slightly outward, and the photographic film 14 has the lips 21 and 20.
A curl like a gutter will be made and sent out from between 1. The same effect can be expected if the side ribs 26 are provided on only one side.

When the above-mentioned photographic film cartridge is loaded in the camera, the door lock part 32 is operated by the mechanism on the camera side.
After the locking of the light shielding lid 16 by the is released, the light shielding lid 16 is rotated in the opening direction. After that, the spool 13 is driven in the delivery direction, and the delivery of the photographic film 14 is started. Lip 2 formed on the outer circumference of the flanges 19 and 20
Since the photo films 1, 21 prevent the photo film 14 from being loosened, the photo film 14 rotates integrally with the spool 13. During this rotation, the leading edge of the photographic film 14 is picked up by the projection 18 and guided to the film passage 17.

When the leading edge of the photographic film 14 is guided to the film passage 17 in this way, the lips 21, 21 are spread to both sides by the photographic film 14, so that the wrapping of the photographic film 14 is released inside the film passage 17. Since the one flange 20 is forcibly rotated in the feeding direction by the engagement of the clutch claw 24 and the locking hole 25, the force for feeding the photographic film 14 is strengthened.
In this way, the photographic film 14 comes to be sent out of the cartridge main body 10.

At the time of rewinding, the spool 13 is rotated in the opposite direction. Since the rear end of the photographic film 14 is locked to the spool 13, the photographic film 14 is wound inside the cartridge body 10 by the reverse rotation of the spool 13. At this time, the flanges 19 and 20 are widened in the depth of the film passage 17, and the surface 22a of the collar 22 guides the photographic film 14 toward the inside of the lips 21 and 21 to dispose the lips 21 and 21 at both ends of the photographic film 14. The photographic film 14 is drawn between the flanges 19 and 20 and is wound around the spool 13 in order to spread the film.

[0032]

EXAMPLE As a concrete shape of the flanges 19 and 20, as shown in FIGS. 4 and 5, the outer diameter A is 18.24 m.
m, inner diameter B of the lip is 17.06 mm, flange 20
The opening 20a has a diameter C of 8.14 mm, the flange 19 has an opening 19a having a diameter D of 12.1 mm, the lip protruding length SH is 1.4 mm for the flange 20, and 1.
25 mm, the width E shown in FIG. 2 is 2.06 m with the flange 20.
m, the flange 19 was 1.91 mm, the inner diameter of the locking hole 25 of the flange 20 was 9.6 mm, and the outer diameter of the locking hole 25 was 13.2 mm. The average thickness of the flanges 19 and 20 was 0.07 to 0.2 mm.

Here, the bottom portions 19c and 20c shown in FIG.
The portions that connect the flat plate portions 19b and 20b to each other are referred to as rising portions 19d and 20d.
The corners between d and the bottoms 19c, 20c are the first corners 19e, 20e, and the rising portions 19d, 2
The corner between 0d and the flat plate portions 19b and 20b is second
Corner portions 19f and 20f, and flat plate portions 19b and 2
The corner portions between 0b and the lip 21 are referred to as third corner portions 19g and 20g. Then, the rising portion 19d,
Diameter G up to the inner root of 20d is 14mm, lip 2
The diameter H to the outer root portion of 1 was set to 17.46 mm.

The injection molding die 39 of the flange 19 is, as shown in FIG. 6, inside the flange 19 (on the lip protruding side).
It is a type in which the outer side and the outer side are each constituted by a split die of two pieces of a movable die 40 and a fixed die 41. The guide pin 42 is
It is provided parallel to the axis passing through the center of the opening 19a,
The flange 19 is formed by a simple back-and-forth movement in which the movable die 40 is moved along the guide pin 42. The mold may be a family take mold that simultaneously molds the pair of flanges 19 and 20. In this case, it is composed of three plates, a fixed type, an intermediate type, and a movable type, and a sprue, a runner, and a gate are provided between the fixed type and the intermediate type, and between the intermediate type and the movable type. It is preferable to use a three-piece metal mold of a type that constitutes a molded product flange.

[First Embodiment] When such a mold 39 is used and injection molding is performed using a polyethylene-based resin described in Japanese Patent Application Laid-Open No. 4-251841 described in the prior art, a disk-shaped product is obtained. This is not a suitable molding method because it has poor fluidity for an extremely thin molded product, short shots are likely to occur, and the wall thickness is not uniform.
Therefore, as a resin, the flexural modulus is 15000 to 30000 Kg /
A resin that satisfies the physical property value of cm ² and has better fluidity in the mold than a polyethylene resin, for example, a melt flow index (JIS-K7210, temperature 280 ° C, load 10 kg) of 70 g / 10 minutes or more. It is better to use. Specifically, it is 66 nylon alloy Y19A (Sumitomo Chemical Co., Ltd.), and the characteristic values of this resin are shown in Table 1.

[0036]

[Table 1] In addition, t represents thickness, and the unit is mm.

In injection molding, molding defects such as weld lines, short shots, sledges, sinks, crazing and cracking may occur depending on the shape, position and number of gates. Therefore, the gate is a disk gate, and the gate thickness is the same as the average wall thickness of the flanges 19 and 20,
Further, the gate land length F is set to 0.1 to 2 mm. The reference numeral 47 indicates a disc gate portion.

The sprue 43 is provided on the fixed die 41 on the axis passing through the center of the opening 20a. The tip of a runner lock pin 45 bites into the cold slag well 44 of the movable die 40. This runner lock pin 45
Draws the molded product flange when the movable die 40 is opened, and pushes out the flange when completely opened. It should be noted that a protruding pin may be provided so as to protrude. Then, as shown in FIG. 7, the flange 19 is punched along the disc gate by a punching machine to remove the runner 46 and form the opening 19a.

Cycle time includes injection time, pressure holding time,
It consists of a cooling time, a mold opening time, an intermediate time, and a mold closing time, and shortening the series of these times is the key to production efficiency.

In injection molding, it is easy to partially change the thickness, but there is a risk that the undercut cannot be released, and if it is forcibly removed, it will deform. For this reason, the inner peripheral surface 21a of the lip 21 is preferably formed with an angle (θ1) with respect to the axis of the spool 13 of 2 to 10 degrees so that deformation or the like does not occur even if it is forcibly pulled out. This is because when the angle (θ1) exceeds 10 degrees, the movable die is rubbed and scratched, and when the angle (θ1) is set to a large angle, the deformation naturally occurs and the die cannot be removed. On the other hand, if it is less than 2 degrees, the force for preventing the photographic film 14 from being loosened is lost.

When the movable die 40 is moved to open the die,
It is necessary to easily release the molded product flange from the fixed mold 41. However, the inner peripheral surface 21 of the lip 21
If a is inclined and the lip 21 is thickened uniformly, the outer peripheral surface of the lip 21 may be undercut, and the fixed die 41 may not be released. Therefore, as shown in FIG. 8, in order to facilitate the release of the outer peripheral surface 21b of the lip 21 from the fixed mold 41, it is desirable to provide an inclination opposite to the inclination of the inner peripheral surface 21a, that is, a draft. If the draft angle is increased, the wall thickness increases, the film winding loosening regulation increases, and the photographic film 14 may not be fed out. Therefore, the angle θ3 shown in FIG.
It is preferably 0 to 3 degrees.

Considering the moldability in this way, the lip 2
The shape of 1 is the outer peripheral surface 21b with respect to the inclination of the inner peripheral surface 21a.
Has a cross-sectional shape that is reversely inclined or is parallel to the axis of the spool 13, so that the wall thickness becomes thicker toward the protruding direction. When the lip 21 is formed with a thickened wall thickness as described above, even if the angle θ1 of the inner peripheral surface 21a is simply defined to be 2 to 10 degrees, crushing occurs near the root of the inner peripheral surface 21a when the product is projected. This is because the average wall thickness is 0.07 even within the maximum undercut ratio (allowable elongation) that allows unreasonable removal.
~ 0.25 mm ultra-thin disc flanges 19, 20
Then, the stress concentration due to insufficient roundness of the third corner portion 19g causes poor strength at the time of protrusion.

Further, it has been found that the film winding loosening regulation force of the lip 21 changes depending on the dimensions of the thickness t1 at the base of the lip 21 and the radius R1 of the inner rounded portion of the third corner portion 19g. Therefore, in order to prevent crushing that occurs when the product protrudes and to obtain a predetermined film winding loosening regulation force, the optimum dimensions of the wall thickness t1 at the base of the lip 21 and the radius R1 of the inner rounded portion of the third corner portion are set. An experiment to be examined was conducted, and the results are shown in FIG. 9 and Table 2.

[0044]

[Table 2]

In the experiment, it is difficult to measure the film winding loosening regulation force of the lip 21. So lip 21
When the looseness regulation of the film is strong, the frictional resistance between the photo film 14 and the lip 21 becomes large, and the film drawing force increases. When the looseness regulation of the film of the lip 21 is weak, the photo film 14 and the lip are weak. By utilizing the fact that the frictional resistance with 21 decreases and the film drawing force decreases, as shown in Table 2, it is possible to investigate the change of the film winding looseness regulation of the lip 21 by the film drawing force (PF suitability). did. In addition, PF shown in Table 2
Appropriateness is determined by measuring the force for pulling out the photographic film 14 from the cartridge main body 10, and indicates ◎ for optimum, ○ for good, Δ for moderately good, and × for unsuitable. There is.

In the experiment shown in FIG. 9, the third corner portion 1
Graph of the probability that the root of the inner peripheral surface of the lip 21 is crushed by the protrusion of the pin (runner lock pin 45) by projecting from the movable die 40 by changing the radius R1 of the inner rounded portion of 9 g to 0.2 mm and changing the thickness t1 of the root It shows with. As can be seen from these results, the thickness t1 is optimally 0.07 to 0.25 mm because if it is thin, crushing, creases and the like occur, and if it is thick, the PF suitability becomes unsuitable. Also,
If the radius R1 of the rounded portion is small, crushing or creases are generated, and if the radius R1 is large, the PF properness becomes unsuitable.
It has been found that a value of mm or less is optimal.

The flange 22 has a function of guiding the photographic film 14 toward the inside of the lip 21 so that the photographic film 14 can easily enter when the film is rolled up.
The cross-sectional shape was such that the tips of 2a were inclined so that they were separated from each other. The angle θ2 of the surface 22a is 1 to 30 degrees with respect to a line orthogonal to the axis of the spool 13, and preferably 3 to 25.
And more preferably 5 to 16 degrees.

The thickness of the brim 22 is tapered toward the front end so as not to be crushed by the photographic film 14 when the photographic film 14 is guided. Specifically, in consideration of moldability of injection molding and that the film is not crushed by the photographic film 14, the thickness of the tip is set to 0.1.
It is desirable to increase the thickness to about 0.25 mm. And
The outermost circumference of the collar 22 is
The cross section has a straight line shape parallel to the spool axis.

The rising portion 19d has a cross-sectional shape inclined by about 5 degrees in consideration of releasability, and the draft is taken into consideration.

If the molded product has a mark on the flange, the photographic film 14 may be scratched or the film may be fed in trouble. Therefore, as shown in FIG. 8, a line along the outer surface 22b of the flange 22 of the flanges 19 and 20 is defined as a parting line (PL). As a result, a parting line is formed inside the outer peripheral portion of the collar 22, and even if burrs should occur, they do not come into contact with the photographic film 14, so the burrs fall off and adhere to the surface of the photographic film 14. There is no fear. The other flange 20 is also the mold of the method described in FIG. 6, and if the same shape as described above is used, the optimum PF suitability can be obtained, and therefore detailed description thereof will be omitted.

[Second Embodiment] In injection molding, regardless of the type of material, in order to make the resin flow smoothly in the mold, it is common to provide the corners with a radius R as large as possible. Target. This prevents pressure loss of the resin in the mold and extends the life of the mold. However,
For example, in the case of the flange 20 shown in FIG. 10, the thickness of each corner portion changes depending on the outer and inner radiuses of the first corner portion 20e, the second corner portion 20f, and the third corner portion 20g. However, the PF suitability changes depending on the thickness of these corners. This is flange 1
The same can be said for 9. Therefore, in order to determine the thickness of each corner portion where a satisfactory PF suitability is obtained, the thickness of each corner portion of the first corner portion 20e, the second corner portion 20f, and the third corner portion 20g is set with respect to the average thickness at. Table 8 shows the results of molding a plurality of different types of flanges 20 and evaluating each of them. The types of the flange 20 used in the experiment are shown in Tables 3 to 6.
Table 7 shows an example of the inner and outer round radii in which the thickness of each corner portion 20e to 20g is determined.

[0052]

[Table 3]

[0053]

[Table 4]

[0054]

[Table 5]

[0055]

[Table 6]

Among the types of flanges shown in Tables 3 to 6, the flange type names "A to E" are those in which the average thickness at is changed, and these have the same corner thickness as the average thickness at. It is a group of uniform thickness. Further, the flange type name with “G” is given with a group “H” in which the two corners of the first corner 20e and the second corner 20f have different thicknesses. Things are 3 with each corner 20e-20g
This is a group in which the thickness of each corner is changed. If the flange type name is "1", the corner thickness is 0.07 mm, and if "2" is added, the corner thickness is 0.10 mm, and "3" is added. The thickness of the corner part is 0.15
It is a group in mm. The angle of the inner peripheral surface 21a of the lip 21 of the flange 20 used in this experiment is 5 degrees (the angle indicated by θ1 in FIG. 10).

[0057]

[Table 7]

[0058]

[Table 8]

In the experiment, as shown in Table 8, in addition to the PF properness, a durability test and a generation state of noise and abrasion powder were also investigated. The PF suitability shown in Table 7 is indicated by the same symbols as described in paragraph number [0045].
From the result of PF suitability, each corner portion 20e to 2e is compared with the one having the same thickness as the average thickness at.
It was found that the PF suitability tends to be improved when the thickness of 0 g is reduced. And each corner portion 20e
When thinning ~ 20g, the average thickness at is 0.11 ~
It has been found desirable to set it in the range of 0.25 mm, preferably 0.13 to 0.18 mm. In addition,
The value of 0.18 mm is the flange type name D (at = 0.1
7) and the flange type name E (at = 0.20). Also, each corner portion 20
The thickness of e to 20 g is 90% or less based on the average thickness at (when the average thickness at is 0.11 to 0.25 mm, preferably 0.13 to 0.18 mm, 0.099 to
0.225 mm or less, preferably 0.117 to 0.16
2 mm or less), preferably 80% or less (average thickness at 0.11 to 0.25 mm, preferably 0.13 to 0.1)
When set to 8 mm, 0.088 to 0.2 mm or less,
Preferably 0.104 to 0.144 mm or less), more preferably 67% or less (average thickness at 0.11 to 0.2).
It has been found that when the thickness is 5 mm, preferably 0.13 to 0.18 mm, 0.074 to 0.168 mm or less, preferably 0.087 to 0.121 mm or less) is desirable. Therefore, the inner and outer rounding radii of each corner portion 20e to 20g are at least 0.1 to 0.455 mm, preferably 0.12 to 0.12 mm, as can be seen from Table 7.
0.4 mm is suitable. In addition, each corner portion 20e-
Molding with a thickness of 20 g below 0.07 mm was difficult in terms of moldability. Therefore, each corner portion 20e
The thickness of ~ 20 g was 0.07 mm or more.

The durability test shown in Table 8 was carried out by repeating the steps of feeding and rewinding the photographic film.
The number of repetitions until the photographic film cannot be fed is described. According to this, the type name of the flange is "A"
Is given, that is, the average thickness at is 0.1
1 mm is 100 to 200 times, and "B" is given, that is, the average thickness at is 0.13 mm.
250 to 400 times, and those with “C”, “D”, “E”, and “F” added to the flange type names, that is, 1000 with an average thickness at of 0.15 mm or more. It was more than once. Therefore, when evaluated from the durability test, it is preferable that the average thickness at is 250 to 400 times or more. Therefore, the average thickness at is preferably 0.13 mm or more.

Regarding the noises shown in Table 8, the loudness of the sound generated at the time of feeding and rewinding the film was examined, and ◎ was given to the one with a small sound, and ○ → △ → according to the loudness.
It is indicated by x. According to this, it was found that the sound becomes loud with the same tendency as that of the PF proper.

With respect to the abrasion powder shown in Table 8, after the durability test was conducted 200 times, it was examined whether or not the abrasion powder was generated inside the cartridge body 10. It is described as ○ → △ → ×. It was found that this also tends to occur with the same tendency as PF properness. Especially in the case of ×, the photographic film 1 rather than the abrasion powder of the molded product flange 20
The emulsion layer on the 4th side was scraped off, resulting in a large amount of emulsion residue.

In injection molding, unless the molding conditions such as the cylinder temperature, the mold temperature, and the injection pressure are changed according to the thickness of the molded product, molding defects such as short shots and uneven wall thickness occur. Therefore, Table 9 shows the molding conditions by which satisfactory moldability can be obtained according to the type of flange described above. In Table 9, the cylinder temperature and the mold temperature are changed to set the optimum temperatures at which satisfactory moldability is obtained, the injection pressure is set from these, and the occurrence of burrs on the molded product at this time is set. I observed the situation. The experiment is
Using an injection molding machine with a screw diameter of 25φ, the injection speed was set to 600 mm / sec regardless of the type of flange.

[0064]

[Table 9] (The mold temperature is the value obtained by measuring the product temperature)

As a result of Table 9, for the thin ones,
Compared with the thick one, the mold temperature is increased by about 22%, the resin temperature is increased by about 11%, and the injection pressure is increased by about 40%. Do you get it. Since this burr can be removed by the secondary processing, there is not much problem.

Under the conditions for molding a group in which "G1" was given to the type name of the flange, the injection pressure was increased by about 8% from the value shown in Table 7, and
It was found that the injection pressure should be set to a value which is increased by about 5% with respect to the value shown in Table 7 under the condition of molding the group having "2". Furthermore, under the conditions when molding a group with "H" added to the flange type name, the injection pressure is set to a value that is further increased by 1 to 3% with respect to the injection pressure of the group with "G" added. I knew I should do it. Thereby, each corner portion 20e to 20g
There is no big difference in the conditions when molding the one that is locally thin compared to the molding conditions when molding a uniform product, so it can be judged that there is no problem in terms of the molding conditions. it can.

Table 10 shows the types of AB having different flexural moduli.
The flange 20 is molded using S resin, and the flange 2
It is the result of performing the PF proper experiment using 0. The PF suitability was described with the same symbols as explained in paragraph number. From the results of Table 10, the two corner portions 20e and 20f are thin (CG2),
Also, in the case where the three corner portions 20e to 20g are thin (CH2), the thickness of the corner portions 20e to 20g is the same as the average thickness at (C),
It was found that satisfactory PF suitability can be obtained by using a resin having a physical property value having a large flexural modulus. That is, at least one of the corners 20e to 20g
By reducing the thickness of the two corners, it is possible to use a resin with a large flexural modulus as the usable resin. As the degree of freedom, a resin having a flexural modulus of 13000 to 30000 Kg / cm ² , preferably 15000 to 25000 Kg / cm ² , is desirable. By using a resin having a physical property value with a large bending elastic modulus value, a flange having high heat resistance and excellent durability under a high temperature environment can be molded.

[0068]

[Table 10]

It goes without saying that the contents of the second embodiment described above can be applied to the flange 19 as they are.

By the way, at the time of injection molding, the flange of the molded product is electrostatically adsorbed to the mold, which may make it difficult to release the mold. Further, there is a possibility that an obstacle due to static electricity may occur during the feeding of the photographic film 14. Therefore, by mixing an antistatic agent into the resin forming the flanges 19 and 20, the above-mentioned adverse effects can be prevented.

Examples of the antistatic agent include poly (oxyethylene) alkylamine, poly (oxyethylene) alkylamide, poly (oxyethylene) alkyl ether, poly (oxyethylene) alkylphenyl ether, glycerin fatty acid ester, sorbitan fatty acid ester. , Alkyl sulfonate, alkyl benzene sulfonate, alkyl sulfate, alkyl phosphate, quaternary ammonium chloride, quaternary ammonium sulfate, quaternary ammonium nitrate, alkyl betaine type, alkyl imidazoline type, alkyl alanine type, polyvinyl benzine type cation, There are polyacrylic acid type cations and the like.

In order to further reduce the frictional resistance with the photographic film 14, and to prevent the photographic film 14 from being adversely affected by light fog or the like, the flanges 19,
A lubricant, a light-shielding substance, an antioxidant, a heat stabilizer, and further an appropriate plasticizer or filler can be added to the resin for molding 20 as required, as long as the effects of the present invention are not impaired.

Typical lubricant names and manufacturer names that can be used for the resin for molding the flanges 19 and 20 are listed below. (1) Silicone-based lubricant Various grades of dimethylpolysiloxane and its modified products (Shin-Etsu Silicone, Toray Silicone) (2) Oleic acid amide lubricant Armoslip CP (Lion Akzo), Neutron (Nippon Seika), Neutron E -18 (Nippon Seika),
Amide O (Nitto Kagaku), Alflo E: 10 (Nippon Yushi), Diamid O-200 (Nippon Kasei), Diamid G-200 (Nippon Kasei), etc.

(3) Elucic acid amide lubricant Alfro-P-10 (NOF Corporation), etc. (4) Stearic acid amide lubricant Alflo-S-10 (NOF CORPORATION), Neutron 2 (NIPPON SEISAKU), Diamid 200 (Nippon Kasei) etc. (5) Bis fatty acid amide lubricant bisamide (Nippon Kasei), Diamid 200 bis (Nippon Kasei), Armowax EBS (Lion Akzo), etc. (6) Nonionic surfactant lubricant Electrostripper TS-2, Electro Stripper-TS-3 (Kao Soap), etc.

(7) Hydrocarbon lubricants Liquid paraffin, natural paraffin, microwax,
Synthetic paraffin, polyethylene wax, polypropylene wax, chlorinated hydrocarbon, fluorocarbon (8) Fatty acid type lubricant Higher fatty acid (C ₁₂ or more is preferable), Oxy fatty acid (9) Ester type lubricant Lower alcohol ester of fatty acid, polyhydric alcohol of fatty acid Esters, polyglycol esters of fatty acids, fatty alcohol esters of fatty acids

(10) Alcohol type lubricant Polyhydric alcohol, polyglycol, polyglycerol (11) Metal soap Lauric acid, stearic acid, ricinoleic acid, naphthenic acid, higher fatty acids such as oleic acid and Li, Mg, Ca, S
Compounds with metals such as r, Ba, Zn, Cd, Al, Sn and Pb

Further, examples of the light-shielding substance added to secure the light-shielding property include the following. In the case of a photographic film cartridge which stores only the developed photographic film 14, it is not necessary to add a light-shielding substance. (1) Inorganic compound A. Oxide 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. B. Hydroxide Aluminum hydroxide, magnesium hydroxide, basic magnesium carbonate, etc. C.I. Carbonate calcium carbonate, magnesium carbonate, dolomite, dawsonite, etc.

D. (Sulfite) Calcium sulfate, barium sulfate, ammonium sulfate, calcium sulfite, etc. E. Silicate talc, clay, mica, asbestos, glass fiber, glass balloon, glass beads, calcium silicate, montmorillonite, bentonite, etc. F. Carbon Carbon black, graphite, carbon fiber, carbon hollow sphere, etc. G. Other iron powder, copper powder, lead powder, tin powder, stainless powder, pearl pigment,
Aluminum powder, molybdenum sulfide, boron fiber, silicon carbide fiber, brass fiber, potassium titanate, lead zirconate titanate, zinc borate, barium metaborate, calcium borate, sodium borate, aluminum paste,
Talc etc. (2) Organic compounds Wood powder (pine, oak, sawdust, etc.), cereal fiber (almond,
Peanuts, fir shells, etc.), various colored fibers such as cotton, jute, paper strips, cellophane strips, nylon fibers, polypropylene fibers, starch, aromatic polyamide fibers, etc.

Among these light-shielding substances, carbon black is preferable because it can reduce the amount of bleed-out. The content is preferably 0.01% by weight or more. Examples of particularly preferable carbon black raw material classifications include gas black, furnace black, channel black, anthracene black, acetylene black, Ketjen carbon black, lamp black, oil smoke, pine smoke, animal black, and vegetable black.

Furnace carbon black is preferable for the purpose of improving the light-shielding property, cost and physical properties, and acetylene carbon black and Ketjen carbon black which is a modified synthetic carbon black are preferable as the light-shielding substance having an antistatic effect although it is expensive. If necessary, it is also preferable to mix the former and the latter according to the required characteristics.

There are various forms of blending the light-shielding substance,
The masterbatch method is preferable from the viewpoints of cost and prevention of contamination of the workplace. Japanese Patent Publication No. 40-19696 discloses a method of dispersing a carbon black in a solution of a polymer dissolved in an organic solvent to prepare a polymer-carbon black masterbatch, and Japanese Patent Publication No. 43-10362. A method of dispersing carbon black in polyethylene to make a masterbatch is described.

When used as a molded article for photographic light-sensitive material such as flanges 19 and 20, there is no fog on the photographic light-sensitive material such as photographic film 14, little change in photosensitivity, and large light-shielding ability. The carbon black has a pH of 6.0 to 9.0 and an average particle diameter of 10 because the formation of lumps of carbon black and the occurrence of pinholes due to fish eyes are difficult even when added to the resin composition. It is preferably 120 mμ, of which volatile components are 2.0% or less and oil absorption is 50 ml / 100.
Furnace carbon black of g or more is preferable. Channel carbon black is expensive and photo film 1
No. 4 is not preferable because many of them cause fog. Even if it is absolutely necessary to use it, its influence on photographic properties should be investigated and selected.

Commercially available carbon black is, 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, # 950, # 2200 (B), # 240
0 (B), MA8, MA11, MA100 and the like.

As overseas products, for example, Black Pearls 2, 46, 70, 71, 74, 80 manufactured by Cabot Corporation,
81, 607, etc., Regal 300, 330, 400, 66
0, 991, SRF-S, etc., Vulcan 3, 6, etc., Sterli
ng 10, SO, V, S, FT-FF, MT-FF and the like. In addition, Ashland Chemical's Uni-te
d R, BB, 15, 102, 3001, 3004, 3
006, 3007, 3008, 3009, 3011, 3
012, XC-3016, XC-3017, 3020 are mentioned, but not limited to these.

The amount of the light-shielding substance added is preferably 0.1.
-15 wt%, more preferably 0.5-10 wt%, most preferably 1.0-7.0 wt%.

Further, it is preferable to add an antioxidant in order to prevent thermal deterioration of the resin and to prevent fish eyes and lumps (lump-like non-uniform failure) from occurring. Representative examples of antioxidants are shown below.

(A) Phenolic antioxidant 6-t-butyl-3-methylphenyl derivative, 2.6
-Di-t-butyl-P-cresol, 2,6-t-butyl-4-ethylphenol, 2.2'-methylenebis-
(4-Ethyl-6-t-butylphenol), 4 '
-Butylidene bis (6-t-butyl-m-cresol), 4.4'-thiobis (6-t-butyl-m-cresol), 4.4-dihydroxydiphenylcyclohexane, alkylated bisphenol, styrenated phenol, 2. 6-di-t-butyl-4-methylphenol,
n-octadecyl-3- (3'.5'-di-t-butyl-4'-hydroxyphenyl) propinate, 2.2 '
-Methylenebis (4-methyl-6-t-butylphenol,

4,4'-thiobis (3-methyl-6-t
-Butylphenyl), 4.4'-butylidene bis (3
-Methyl-6-t-butylphenol), stearyl-
β (3,5-di-4-butyl-4-hydroxyphenyl) propionate, 1,1.3-tris (2-methyl-4hydroxy-5-t-butylphenyl) butane, 1
-3,5 trimethyl-2,4,6-tris (3,5-di-t-butyl-4hydroxybenzyl) benzene, tetrakis [methylene-3 (3 ', 5'-di-t-butyl-
4'-hydroxyphenyl) propionate] methane

(B) Ketone amine condensation type antioxidant 6-ethoxy-2,2,4-trimethyl-1,2-dihydroquinoline, polymer of 2,2,4-trimethyl-1,2-dihydroquinoline, trimethyl Dihydroquinoline Derivative (C) Allylamine Antioxidant Phenyl-α-naphthylamine, N-phenyl-β-naphthylamine, N-phenyl-N′-isopyropyr-P
-Phenylenediamine, N-N'-di-β-naphthyl-
P-phenylenediamine, N- (3'-hydroxybutylidene) -1-naphthylamine

(D) Imidazole type antioxidant 2-mercaptobenzimidazole, zinc salt of 2-mercaptobenzimidazole, 2-mercaptomethylbenzimidazole (e) phosphite type antioxidant alkylated allyl phosphite, diphenylisodecyl Phosphite, tris (nonylphenyl) phosphite sodium phosphite, trinonylphenyl phosphite, triphenyl phosphite (f) Thiourea-based antioxidant thiourea derivative, 1.3-bis (dimethylaminopropyl) -2 -Thiourea (to) Other antioxidants useful for air oxidation Dilauryl thiodipropionate

Next, typical commercial antioxidants are shown below. (1) Phenolic antioxidant SUMILIZER BHT (Sumitomo), IRGANOX 1076 (Ciba Geigy)
, MARK AO-50 (Adeka Argus), SUMILIZER BP-76
(Sumitomo), TOMINOX SS (Yoshitomi), IRGANOX 565 (Ciba Geigy), IONOX WSP (ICI), SANTONOX (Monsanto), SUMILI
ZER WX R (Sumitomo), ANTAGE CRYSTAL (Kawaguchi), IRGANOX 103
5 (Ciba Geigy), ANTAGE W-400 (Kawaguchi), NOCLIZER
NS-6 (Ouchi Emerging), IRGANOX 1425 WL (Ciba Geigy), M
ARK AO-80 (Adeka Argus), SUMILIZER GA-80 (Sumitomo), TOPANOL CA (ICI), MARK AO-30 (Adeka Argus), MARK AO-20 (Adeka Argus), IRGANOX 3114
(Ciba Geigy), MARK AO-330 (Adeka Argus),
IRGANOX 1330 (Ciba Geigy), CYANOX 1790 (ACC), IR
GANOX 1010 (Ciba Geigy), MARK AO-60 (Adeka Argus), SUMILIZER BP-101 (Sumitomo), TOMINOX TT (Yoshitomi)

(2) Phosphorus antioxidant IRGAFOS 168 (Ciba Geigy), MARK 2112 (Adeka Argus), WESTON 618 (BorgWarner), MARK PEP-8
(Adeka Argus), ULTRANOX 626 (Borg Warner), MARK PEP-24G (Adeka Argus), MARK PEP.3
6 (Adeka Argus), HCA (Sankou) (3) Thioether antioxidant; DLTDP "YOSHITOMI" (Yoshitomi), SUMILIZER (Sumitomo), ANTIOX
L (NOF), DMTD "Y-OSHITOMI" (Yoshitomi), SUMILIZER TP
M (Sumitomo), ANTIOX M (NOF), DSTP "YOSHITO-MI" (Yoshitomi), SUMILIZER TPS (Sumitomo), ANTIOX S (NOF), SEEN
OX 412S (Cipro), MARK AO-412 S (Adeka Argus)
, SUMILIZER TP-D (Sumitomo), MARK AO-23 (Adeka Argus), SANDSTAB P-EPQ (Sand), IRGAFOS P-EPQ FF
(Ciba-Geigy), IRGANOX 1222 (Ciba-Geigy), MA
RK 329K (Adeka Argus), WES-TON 399 (Borg Warner), MARK 260 (Adeka Argus), MARK 522A
(Adeka Argus) (4) Metal deactivator NAUGARD XL-1 (Uniroyal), MARK CDA-1 (Adeka
Argus), MARK CDA-6 (Adeka Argus), LRGANO
X-MD-1024 (Ciba Geigy), CUNOX (Mitsui Toatsu)

Particularly preferred antioxidants are phenolic antioxidants, and commercially available products include various Irganox products manufactured by Ciba-Geigy and Sumilizer BHT manufactured by Sumitomo Chemical Co., Ltd.
, S-umilizer BH-76, Sumilizer WX-R, Sumilizer BP-
It is 101 mag. Further, it is preferable to use a mixture of two or more phenol-based antioxidants and / or phosphorus-based antioxidants because the antioxidant effect will be enhanced.

Representative examples of the most preferred hindered phenolic antioxidants for the present invention are shown below. 1,3,5-Trimethyl 2,4,6-tris (3,5-di-tert-butyl-4-hydroxybenzyl) benzene, tetrakis [methylene-3- (3 ′ · 5′-di-tert-butyl) −
4'-hydroxyphenyl) probionate] methane,
Octadecyl-3,5-di-tert-butyl-4-hydroxy-hydrocinnamate, 2,2 ′, 2′-tris [(3,5-di-tert-butyl-4-hydroxyphenyl) propionyloxy] ethyl Isocyanurate,
1,3,5-tris (4-tert-butyl-3-hydroxy-2,6-di-methylbenzyl] isocyanurate,
Tetrakis (2,4-di-tert-butylphenyl) 4,
4'-biphenylene diphosphite,

4,4 ': thiobis- (6-tert-butyl-O-cresol), 2-2'thiobis (6-tert-butyl-4-methylphenol), tris- (2-methyl-4-hydroxy) -5-tert-butylphenyl) butane, 2,2'-methylene-bis- (4-methyl-6-te
rt-butylphenol), 4,4'-methylene-bis-
(2,6-di-tert-butylphenol), 4,4'-
Butylidene-bis- (3-methyl-6-tert-butylphenol), 2,6-di-tert-butyl-4-methylphenol, 4-hydroxymethyl-2,6-di-tert
-Butylphenol, 2,6-di-tert-4-n-butylphenol,

2,6-bis (2'-hydroxy-3 '
-Tert-butyl-5'-methylbenzyl) -4-methylphenol, 4,4'-methylene-bis- (6-tert-
Butyl-O-cresol, 4,4'-butylidene-bis (6-tert-butyl-m-cresol), 3.9-bis {1.1-dimethyl-2- [β- (3-t-butyl- Four
-Hydroxy-5-methylphenyl) propionyloxy] ethyl} 2,4,8,10-tetraoxaspiro [5,5] undecane and the like. Among these, those having a melting point of 100 ° C. or higher, particularly 120 ° C. or higher are preferable. Further, it is effective to use it in combination with a phosphorus-based antioxidant.

In addition, in the present invention, each additive can be used if necessary. Next, representative examples of the additives will be described below, but the present invention is not limited thereto, and
It can be selected from all known ones. (Type of additive); (Representative example) (1) Plasticizer; Phthalate ester, glycol ester, fatty acid ester, phosphate ester, etc. (2) Stabilizer: Lead-based, cadmium-based, zinc-based, alkaline earth metal-based , Organic tin type, etc. (3) Flame retardant; Phosphate ester, halogenated phosphoric acid ester, halide, inorganic substance, phosphorus-containing polyol, etc. (4) Filler: Alumina, kaolin, clay, calcium carbonate, mica, talc, titanium oxide, Silica, etc. (5) Reinforcing agent; glass roving, metal fiber, glass fiber, glass milled fiber, carbon fiber, etc.

(6) Foaming agent: Inorganic foaming agent (ammonia carbonate, sodium bicarbonate), organic foaming agent (nitroso type, azo type), etc. (7) Vulcanizing agent: Vulcanization accelerator, accelerating aid, etc. (8) Degradation Inhibitors: UV absorbers, antioxidants, metal deactivators, peroxide decomposers, etc. (9) Coupling agents: Silane-based, titanate-based, chromium-based, aluminum-based, etc. (10) Various thermoplastic resins Rubber type (11) Nucleating agent; Organic nucleating agent (dibenzylidene sorbitol compound etc.), Inorganic nucleating agent (calcium carbonate etc.)

[0099]

As described above, the spool shaft around which the photographic film is wound in a roll shape, the pair of flanges attached to the spool shaft, and at least the flange so as to wrap the outermost peripheral end portion of the photographic film. In a photographic film cartridge, which is integrally formed on one outer periphery and has a lip for controlling looseness of the photographic film,
The inner peripheral surface of the lip, which is an undercut during injection molding, is inclined at an angle of 2 to 10 degrees so that the root side of the inner peripheral surface that wraps the outermost peripheral portion of the photo film is separated from the outer peripheral surface of the photo film. In this case, the lip can be forcibly removed without causing deformation or the like. As a result, the flange can be injection-molded with a low-cost mold with a two-piece structure, and the cost of the equipment can be reduced and the size can be reduced compared to the conventional technology, and high-speed, large-volume, automated production is possible. A molded product with high dimensional accuracy and stable quality can be obtained. Moreover, since the thickness of the lip is increased from the root to the tip, the strength is increased, and the looseness of the photographic film can be reliably regulated. Further, since the outer peripheral surface of the lip is inclined at an angle of 0 to 3 degrees in the direction opposite to the inner peripheral surface, it is possible to easily release from the mold.

Further, the photographic film is provided with a pair of flanges attached to both ends of a spool shaft around which the photographic film is wound in a roll shape, and a bottom portion provided with an opening for inserting the spool shaft, and an outer periphery of the bottom portion of the photographic film are attached to the photographic film. A rising part bent in the winding direction, and a flat plate part bent in a direction away from the spool shaft from the tip of the rising part,
The flat plate portion is bent in the winding direction of the photo film, and at least one of the pair of flanges has a cross-sectional shape provided with a lip that wraps around the outermost peripheral edge of the photo film to control the looseness of the photo film. In a photographic film cartridge having a flange formed by injection molding, the first portion between the bottom and the rising portion of the flange.
The corner part, and the second part between the rising part and the flat plate part
3rd corner between the flat part and the base of the lip
If the thickness of at least one of the corners and the corners is made smaller than the thickness of the flat plate, a resin with a large flexural modulus can be used, and the flange of the molded product will have a high temperature environment. It can be durable enough to endure underneath.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a photographic film cartridge of the present invention.

2A and 2B are cross-sectional views showing a pair of flanges.

FIG. 3 is a sectional view of a photographic film cartridge.

FIG. 4 is a side view of a flange on one side.

FIG. 5 is a side view of the other flange.

FIG. 6 is a sectional view showing a mold for injection molding a flange.

FIG. 7 is a perspective view showing a state where a runner is punched by a punching machine.

FIG. 8 is an enlarged sectional view of a main part of a lip of a flange.

FIG. 9 is a graph experimentally showing the probability of collapsing of the lip root when the molded product flange is projected from the movable mold depending on the thickness of the lip root.

FIG. 10 is a sectional view showing a main part of a flange of another embodiment.

FIG. 11 is a cross-sectional view showing a main part of a flange having a uniform thickness.

FIG. 12 is a cross-sectional view showing a main part of a flange in which two corners of each corner have a reduced thickness.

FIG. 13 is a cross-sectional view showing the main parts of a flange in which the thickness of each corner is reduced.

[Explanation of symbols]

 13 spools 19 and 20 flanges 19a and 20a openings 19b and 20b flat plate portions 19c and 20c bottom portions 19d and 20d rising portions 19e and 20e first corner portions 19f and 20f second corner portions 19g and 20g third corner portions 21 lips 21a inner circumference Surface 21b Outer peripheral surface 22 Tsuba

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Seiichi Watanabe 2-12-1, Ogimachi, Odawara-shi, Kanagawa Fuji Photo Film Co., Ltd.

Claims (8)

[Claims] 1. A spool shaft around which a photographic film is wound in a roll shape, a pair of flanges attached to the spool shaft, and an outer periphery of at least one of the flanges so as to enclose the outermost peripheral end of the photographic film. In a photographic film cartridge formed with a lip for controlling looseness of the photographic film, the flange is formed by injection molding,
The lip is 2-1 so that the root side of the inner peripheral surface wrapping the outermost periphery of the photographic film is separated from the outermost periphery of the photographic film.
A photographic film cartridge, having a cross-sectional shape inclined at an angle of 0 degree, and having a wall thickness formed thicker from the root to the tip. 2. The photographic film cartridge according to claim 1, wherein the lip has a cross-sectional shape in which an outer peripheral surface is inclined in an opposite direction to the inner peripheral surface at an angle of 0 to 3 degrees. . 3. A photographic film is provided with a pair of flanges attached to both ends of a spool shaft wound in a roll shape, a bottom portion provided with an opening for inserting the spool shaft, and a photographic film from the outer periphery of the bottom portion. A rising part bent in the winding direction, a flat plate part bent from the tip of the rising part in a direction away from the spool shaft, and a bending part in the winding direction of the photo film from the outer periphery of the flat plate part. In a photographic film cartridge in which at least one flange of the pair of flanges is formed by injection molding with a lip that wraps around the outermost peripheral end of the photographic film to regulate the looseness of the photographic film, and the flange is a bottom part. The first corner portion between the rising portion and the second corner portion between the rising portion and the flat plate portion, and the flat portion. A photographic film cartridge, wherein at least one of the corners of the third portion and the root of the lip is formed thinner than the thickness of the flat plate portion. . 4. The flat plate portion has a thickness of 0.11 to 0.2.
The photographic film cartridge according to claim 3, wherein the photographic film cartridge has a thickness of 5 mm. 5. The first corner portion, the second corner portion,
The thickness of at least one of the third corner portions is 0.07 mm or more, and 90% or less of the thickness of the flat plate portion. Photo film Patrone. 6. The inner and outer rounded radii of at least one of the first corner portion, the second corner portion and the third corner portion are 0.11 to 0.4 mm. The photographic film cartridge according to claim 5. 7. The flexural modulus of the flange is 13000-
The photographic film cartridge according to claim 1 or 2, which is injection-molded from a resin material having a physical property value of 30,000 Kg / cm ² . 8. The flange has a flexural modulus of 13000 to
7. A photographic film cartridge according to claim 3, wherein the photographic film cartridge is injection molded from a resin material having a physical property value of 30,000 Kg / cm ² .