JPS62284355A - Spool for photographic film - Google Patents

Abstract

PURPOSE:To improve the lubricity of a spool surface and to decrease the frictional resistance with a cap by forming the spool of a carbon black, carboxyl modified silicone oil and polystyrene resin contg. a specific ratio of rubber. CONSTITUTION:0.05-3.00wt% Carbon black (B), 0.20-2.00wt% carboxyl modified silicone oil (C), and 0.5-6.0wt% rubber (e.g.: butadiene rubber) are added to the polystyrene resin (A) forming the spool. The component B is preferably furnace black for >=50% and the component C is preferably the silicone oil expressed by the formula. A phenolic or phosphorus antioxidant can be incorporated into the component A. The load tension during the drawing out of a photographic film is thereby decreased and the cutting of the film is prevented.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a spool for a cartridge for photographic film into which roll film such as 16ml or 35n is loaded.

[Conventional technology]

The conventional cartridge has a cylindrical body plate 1 as shown in Fig. 4.
A Nakako spool 2 is housed therein, and caps 3.3 are fitted on both ends of the spool 2. A beak-shaped port (film outlet) 5 is formed in the body plate 1 to which a light-shielding lid 4 is attached. The spool 2 has posts 7 at both ends of the photographic film winding shaft 6.
．． 7 is formed, which is rotatably fitted into shaft holes 8, 8 provided in the center of the character f3.3. Further, in this spool 2, flanges 9, 9 are integrally molded near the inside of the characters f3, 3.

The photographic film 10 has its tip 11 at the port 5 of the body plate 1.
Most of the remaining film is wound around the outer periphery of the photographic film winding shaft 6.

/4' For the external dimensions and shape of Torone, please refer to J.
Although the standard is standardized by IS K-7528, etc., there are no specific regulations regarding its internal structure, so it differs depending on each photographic film manufacturer.

In particular, the shape of the cap 3 is determined by each manufacturer for purposes such as preventing light from leaking into the inside of the armpit, regulating the axial position of the spool 2, and supporting the death 7 of the spool 2. Many different ideas have been used.

FIG. 5 shows the shape of the cap used in the conventional Nonotorone.

The cap 30 shown in (,) has a part of its inner wall abutting the outer edge of the seven flange 9 of the spool 2, and an end edge on the shaft hole 8 side that is bent outward and abutting the outer periphery of the sleeve. are in contact with each other.

(b) The cap 31 shown in K has its shaft hole 8 enlarged so that it does not come into contact with the groove 7. In order to prevent light from entering through this gap, () of the cap 31i is in contact with the flange 9.

The cap 32 shown in parentheses (, ) is configured to have a large contact area with the flange 9 so that almost the entire surface of the seven flange 9 comes into contact with the cap 32.

However, the cap 30 of (,) is the inner wall that abuts the 7-lunge 9, or ? It is difficult to form the edge that fits into the spool, and therefore the positioning of the spool 2 in the length direction is uncertain, and there is also a problem in terms of light shielding, so generally (b) t ( The cap shown in c) is often used.

However, the No. 9 Torone equipped with the caps 31 and 32 of b) or c) has a larger contact area between the inner wall and the flange 9 of the spool 2 than the caps of (,), and Due to the play between the cap 31, 32 and the spool 2, the edge of the spool 2 bites into the outer periphery of the post 7 when the spool 2 rotates, causing a large frictional resistance between the cap 31, 32 and the spool 2. For this reason, such a cap 31, 32 is provided.--When pulling out the photographic film 10 from the port 5 of the Toronet, great force is required, and in extreme cases, the photographic film 10 is sent inside the camera. Sometimes a so-called break occurs.

This tearing phenomenon occurs when the load tension applied to the film perforation by the active rotation of the sprocket exceeds the breaking strength of the perforation when the photographic film 10 is moved by the sprocket in the camera. It happens.

Utility Model Publication No. 61-3000 considers that this load tension is mainly caused by the frictional resistance between the cap and the spool, and as a countermeasure, a lubricated surface is provided on the surface of the mutually contacting parts of at least one of the spool and the cap. A patrone forming a cartridge is disclosed. For example, as shown in FIG. 6, the cartridge spool is made by applying a lubricant solution prepared by dissolving the lubricant in a low-boiling organic solvent to the outer surface of the 7 flange 9 and the boss 7 using a brush, spray gun, or other means. A lubricant layer 12 is formed by coating the outer peripheral surface of the lubricant.

[Problem that the invention seeks to solve]

However, since such conventional methods use a volatile and flammable lubricant solution dissolved in a low-boiling organic solvent, there is a risk of ignition, etc., and the handling thereof is troublesome. In addition, these equipments are expensive, and in order to apply a lubricant layer with a dry thickness in the range of 0.1 to 1 μm, productivity is low and extremely slow even if the evaporation rate of the solvent is fast. There was a problem with Cost Store.

The present invention solves these problems and has low film draw-out load tension, good injection moldability (release from the mold), no surface scratches or abrasion, and excellent manufacturing suitability. The purpose is to provide an excellent photographic film spool.

[Means for solving problems]

The present invention has been made to achieve the above object, and it is possible to reduce the surface frictional resistance even if the spool itself is made of a resin containing a lubricant instead of forming a lubricant layer on the spool. This was done with a focus on Of the wide variety of lubricants available, the inventors discovered that the resin to which a predetermined amount of carboxyl-modified silicone oil was added was
This invention was first made based on the discovery that it is most suitable for spools. That is, if a large amount of carboxyl-modified silicone oil is added, problems occur during the molding cycle, etc., and the range in which frictional resistance can be lowered without causing other problems as described above is limited. In addition, among other lubricants, fluorosilicone oil and fluorine-modified silicone oil, which are described in silicone manufacturer's catalogs as having a very small coefficient of friction and excellent lubricity, are polystyrene-based oils containing these. When the spool was formed from a resin, the pull-out load tension of the photographic film was large and not much different from that of a product without additives, so the object of the present invention could not be achieved.

As described above, the present invention is the result of intensive research by the inventors, and has made it possible for the first time to provide a spool that has advantages such as low surface frictional resistance and lower cost than conventional spools. .

That is, the photographic film spool of the present invention has a spool of 0.0
5-3.00 heavy view% carbon tsura, rito 0.20-2
．． 00% by weight carboxyl modified silicone oil and 0
．． It is characterized by being made of polystyrene resin containing 5 to 6.0% by weight of rubber.

As shown in FIG. 1, in the photographic film spool 2 according to the present invention, the winding shaft 6, the post 7, and the flange 9 are all made of the above-mentioned resin. It is preferable to reduce the resistance to prevent the generation of static electricity, and to ensure light-shielding properties when incorporated into a Noctrone.

Carbon black is added to ensure physical strength, ensure light-shielding properties, and prevent static electricity. Various types of carbon black are used for this carbon plastic, but they are inexpensive, have excellent hiding power, and have harmful effects on photographic films (occurrence of fogging, changes in sensitivity due to decreased or increased sensitivity, adhesion, etc.) PH5-9, average particle size 10-12
Furnace carbon black with a diameter of 0 μm is preferred, particularly oil furnace carbon black with an average particle size of 15 to 50 μm and a pH of 6 to 8. - Black is preferred.

Further, when the purpose is to prevent static electricity, it is preferable to use Ketjen carbon black, which is a by-product carbon black modified by acetylene carbon plastic, although it is expensive.

However, even when the purpose is to prevent static electricity, it is preferable to use furnace carbon black with a carbon black of 50 or more, from the viewpoints of price, ensuring the physical strength of the spool, ensuring light-shielding properties, preventing adverse photographic effects, and injection moldability. .

The amount of carbon black added depends on the price, physical strength of the spool, light shielding, prevention of harmful effects on photographs, injection moldability,
From the viewpoint of appearance etc., it is limited to 0.05 to 3.00% by weight.

If the amount of carbon black added is less than 0.05% by weight, light shielding properties cannot be ensured unless the thickness of the spool is increased, and light fogging occurs. If you try to increase the wall thickness by 0.05% by weight to ensure light-shielding properties, the amount of resin used will increase and the amount of resin used will increase. , which increases costs.

If the amount of carbon added exceeds 3.00% by weight, not only will it be expensive, but the physical strength of the spool will decrease and weld lines will occur. In addition, the spool absorbs moisture easily, which not only causes adverse photographic effects, but also causes poor appearance of the spool (silver streaks, uneven gloss, reduced gloss, etc.), and scratches and abrasion on the spool surface. Furthermore, the fluidity of the resin deteriorates, and the injection moldability also deteriorates.

Carboxyl-modified silicone oil is added to improve the lubricity of the spool surface and reduce frictional resistance. This carboxyl-modified silicone oil is manufactured by silicone oil manufacturers (Shin-Etsu Chemical ■, Toshiba Silicone ■, Toray Silicone ■, Unlon Car
carboxyl-modified silicone oil with the following structure (Product name:
000C8 (25℃) is 1°.

The above-mentioned product having the following structural formula has good crosstalk with polystyrene resin, and not only can the lubricity be greatly improved by adding a small amount, but also the charging time of the resin can be shortened.

The amount added is limited to 0.20 to 2.00% by weight. Added amount of carboxyl modified silicone oil is 0.20% by weight
If it is less than that, not only will the desired lubricity effect not be obtained, but the kneading cost and silicone cost will be increased.

If the amount of carboxyl-modified silicone oil added exceeds 2.00% by weight, the measured value of the resin will become unstable due to screw slippage, the resin charging time will become longer, the molding cycle will become longer, and the lubricity effect will be reduced. 2. There is almost no difference from OOM quantity Q, and the cost will only increase. In addition, poor appearance occurs due to poor dispersion of carbon plaque, and the large amount of silicon on the surface makes it easy to get stuck, resulting in increased dust adhesion. Furthermore, if there is a large amount of silicon on the surface, harmful effects will occur. Rubber is added to increase the strength of polystyrene resin, which has low impact strength.

As the rubber, 6-year-old synthetic rubber is generally used, and among the synthetic rubbers, butadiene rubber is most commonly used.

Rubber t Addition Sur IQ is a high-impact polystyrene resin (hereinafter referred to as H
IPS) or medium impact polystyrene resin (hereinafter referred to as MIPS) and general purpose polystyrene resin (hereinafter referred to as CP)
Even if a resin blended with
Regardless of whether PS or MIPS is used alone, G
A resin that is a blend of PPS and rubber may also be used. It is preferable to use a blended resin of HIPS and GPPS or to use MIPS alone. In this case, impact resistance and abrasion resistance are improved by graft polymerizing styrene monomer to the rubber. be done.

The amount of rubber added is 0.5 to 6.0% by weight in terms of price, physical strength, injection moldability, surface strength (to prevent scratches and wear), appearance, etc. Rubber amount is 0.5 weight jk
If the rubber content is less than 6.0% by weight, there will be problems in securing physical strength and surface strength, and if the rubber content exceeds 6.0% by weight, problems will occur in terms of injection moldability, rigidity, appearance, price, etc. 9 It cannot be put into practical use.

The polymerization method most commonly used at present is GP
In PS, sb, HIP is used in bulk polymerization method, granular polymerization method, etc.
For S and MIPS, bulk polymerization method, bulk-granular polymerization method, etc. are used.

As a method for adding carbon black, carboxyl-modified silicone oil, and rubber, any known method such as a compound method, a powder method, a master patch method, a liquid method, etc. can be used.

Among these methods, the master patch method is especially cost effective.
This is preferable in terms of preventing contamination of the workplace. The master patch may be made of any one of Kagenpla, resin, carboxyl-modified silicone oil, rubber, or rubber-containing polystyrene resin in a small amount, or all three.

The master patch resin does not need to be a polystyrene resin, but is preferably a thermoplastic resin that is easily kneaded with a polystyrene resin, such as a polyolefin resin.

Among polyolefin resins, ethylene ethyl acrylate copolymer resin (abbreviation EEA), ethylene methyl acrylate copolymer resin (abbreviation EMA), ethylene acrylate copolymer resin (abbreviation EMA), etc.
Vinyl acetate copolymer resin (abbreviation: EVA), linear low-density polyethylene resin (abbreviation: L-LDPE), high-pressure branched low-density polyethylene resin (abbreviation: LDPE), ethylene-acrylic acid resin (abbreviation: EAA), etc. are preferred. . Further, the resin for the master patch is preferably a thermoplastic resin having a higher simelt index than the polystyrene resin which is the main resin.

This is because the carbon black, carboxyl-modified silicone oil, and Hicom or rubber-containing polystyrene resin used to form the master patch can be uniformly dispersed in the base resin.

In addition, various additives can be suitably blended into the polystyrene resin composition of the present invention within a range that does not impair the effects of the invention. Specifically, antioxidants, light stabilizers, ultraviolet absorbers, nucleating agents, antistatic agents, pigments, face powder dispersants, lubricants,
These include neutralizing agents, acid scavengers, dyes, and metal powders. It is also possible to add necessary amounts of polyolefin resin, elastomer, etc. Blending with other lubricants (including various silicone oils), antiblocking agents, silicon oxide (SIO2), pigments, etc. is effective in improving injection moldability and last torque.

In the present invention, since carbon black and carboxyl-modified silicone oil are added, an antioxidant for rubber is not necessarily required, but it improves suitability for long-term continuous injection molding production.
Various antioxidants can be added to improve suitability for high-temperature injection molding.

When adding antioxidants, the most preferable antioxidants are phenol and phosphorus, which do not have any adverse effects on photographic film. Sulfur and amine antioxidants may have an adverse effect on photographic film, so it is better not to use them. preferable. Addition amount is 0.01~
It is 1.0% by weight. Since the principle of photographic film is to use oxidation and reduction effects, even when using a phenolic or phosphorus antioxidant, if the amount exceeds 1.0% by weight, it will have an adverse effect on the photographic film.

[For production]

Since the spool for photographic film of the present invention is made of a resin containing carboxyl-modified silicone oil, it improves the lubricity of the spool surface and reduces the frictional resistance between the cap and the spool. This allows the photographic film drawer load tension to be reduced. That is, the largest factor in the photographic film drawer load tension is the frictional resistance between the cap and the spool, and by reducing this frictional resistance, the load tension can be reduced.

Furthermore, variations in the magnitude of the photographic film drawer load tension occur due to the types of photographic film and cartridges used, or differences in the structure of the camera, but in any case, the magnitude of the load tension at the end of the photographic film drawer (last torque) is often the largest.

Therefore, breaks in photographic film often occur when this last load tension acts, but this last load tension is reduced to prevent cuts.

Moreover, the resin charging time during injection molding can be shortened, and the molding cycle can be shortened.

〔Example〕

Table 1 shows experimental results comparing examples of the photographic film spool of the present invention and its characteristics with conventional products and comparative products.

Here, as a molding machine, a mold pressure of 150 t of Nestal (trade name) manufactured by Sumitomo Heavy Industries was used, and a test piece for static friction coefficient measurement was used.
A test piece for Izot impact zero strength and a spool for use in a cartridge for photographic film having the shape shown in FIG. 4 were formed by injection molding.

Although the above examples are representative examples of preferred embodiments of the spool for use in photographic film and arm trones of the present invention, the present invention is not limited thereto.

The evaluation in the table is based on the following.

◎: Very good, O: Excellent, ・: Practical limit, M: Problem, improvement required, Load a cartridge for photographic film using the device into the 35mm camera 20, pull out the tip 11 of the photographic film 10 from the port 5, and then insert the cartridge into the camera 2.
Nip roll 22.23 through the notch 21 provided at 0
It can be pulled out by holding it in place. To this nip roll 23, torque victor and g
-3S type), the motor 25 is driven at a constant speed (linear speed 40 frames/(8)) to take 36 images. Win
48ha1 was also pulled out using the irisho. The torque at that time is measured with a torque picker, and the torque value measured with f24 is the tensile strength, l/
It is converted to , and is expressed as "I". The smaller the value, the smaller the frictional resistance when pulling out, indicating that the spool is superior.

Note 2 * Coefficient of Static Friction One test piece with a width of 35 mm and a length of 75 mm formed by injection molding was pasted on an inclined surface, and the other was pasted on the bottom of a metal plate with a load of 200.9. Layer it so that it makes contact with the test specimen on the sloped surface, and calculate the angle at which it starts sliding to determine the coefficient of static friction. The smaller the value, the lower the frictional resistance.

Note 3 * Izot @ impact strength...JIS K7110
.

(23℃).

Among the modified silicone oils, amine-modified silicone oil was excluded from the test because it had adverse effects on photographic films (capri generation, etc.). Addition amount of carxyl-modified silicone oil and polystyrene resin resistance during spool injection molding J + -, -, > 4a: Last torque (drawer load tension at the last of the film), Izotsu impact strength, spool The relationship between the 7-lunge strength and the spool surface sliminess is shown in FIG.

Here, the 7-lunge strength of the spool is determined by fixing one flange part, hooking a chuck to the other 7-lunge part, applying upward tension with a Toyo Seiki Strograph, and calculating the tension value when the 7-lunge breaks. A method of detection using a load cell was used.

What is the slipperiness of the surface? After two days, the surface of the injection-molded spool of photographic film is inspected by hand.
This is a characteristic that determines the slimy feel based on the touch of the fingertips.

Note that the Izot impact strength is the same as that of the above-mentioned property 3.

From FIG. 3), it can be seen that by adding a predetermined range of carboxyl-modified silicone, the last torque, isot impact strength, resin chargeability, etc. can be improved.

〔Effect of the invention〕

The photographic film spool of the present invention is made of a polystyrene resin containing a predetermined amount of carboxyl-modified silicone oil, carbon black, and rubber, so it can significantly reduce last torque and improve iso impact strength. Furthermore, the charging time of polystyrene resin when injection molding a photographic film spool can be shortened, and the molding cycle can also be shortened. Good mold release properties can also be achieved when taking out the spool from the mold.

Therefore, the photographic film can be fed out from the cartridge extremely smoothly, which not only prevents the occurrence of cuts in the photographic film stored in the camera, but also greatly reduces the consumption of the drive battery in cameras with recent automatic film winding mechanisms. can.

Furthermore, since the equipment is inexpensive and the productivity is good, costs can be lowered compared to conventional methods.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of a spool according to the present invention, FIG. 2 is a schematic diagram of a load tension measuring device, and FIG. 3 is a diagram showing the relationship between the amount of carboxyl-modified silicone oil added and each characteristic evaluation. . FIG. 4 is a sectional view of a conventional cartridge, and FIG. 5 is a sectional view showing the relationship between the spool and cap of a conventional nonoctorone. FIG. 6 is a sectional view of a conventional spool. 1... body plate, 2... spool, 3... cap,
5...port, 1"...screw, 9...7 lunge,
10... Photographic film, 30-32... Cap,
12...Lubricant layer.

Claims (4)

[Claims] (1) Made of polystyrene resin containing 0.05-3.00% by weight of carbon black, 0.20-2.00% by weight of carboxyl-modified silicone oil, and 0.5-6.0% by weight of rubber. A spool for photographic film characterized by (2) The spool for photographic film according to claim 1, wherein 50% or more of the carbon black is furnace carbon black. (3) The spool for photographic film according to claim 1 or 2, wherein the structural formula of the carboxyl-modified silicone oil is ▲There are mathematical formulas, chemical formulas, tables, etc.▼ (4) Claims 1 and 2, wherein the polystyrene resin contains a phenolic or phosphorus antioxidant.
Spool for photographic film as described in paragraph or paragraph 3