JPH0272348A - Photographic film magazine - Google Patents

Abstract

PURPOSE:To improve the light leakage preventing function, i.e. light shieldability of the magazine and to facilitate putting in and out of a film by specifying the thickness error of a woven fabric for light shielding. CONSTITUTION:The thickness error of the woven fabric for light shielding of the photographic magazine formed by sticking the wove fabric for light shielding which has piles 1 and is coated with a sealing resin layer to the inner side of the photographic film inlet/outlet part is suppressed in the thickness error of the woven fabric for light shielding to <=30%. The sealing resin liquid in the application of the sealing resin is specified to 20 to 50dyne/cm surface tension and 1 to 300cps viscosity at 25 deg.C room temp. The magazine which allows easy putting in and out of the photographic sensitive material, does not scratch the top and bottom surfaces of the photosensitive material and has high light shieldability is surely and stably obtd. in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a light-shielding film container to be fitted into a camera, and more particularly to a light-shielding member having a pile attached to a film opening/exit portion of the light-shielding film container.

[Background of the invention]

2. Description of the Related Art In a light-shielding film container such as a cartridge that is fitted into a camera, a light-shielding member is usually attached to the film entrance/exit portion to prevent light from entering the container body through the film entrance/exit.

This light shielding member is used not only to shield the film from light, but also to prevent damage to the film when pulling out and rewinding the film, and to facilitate the operation of pulling out and rewinding the film.
A flexible material such as woven pile fabric is used. The most common example is a pile woven fabric attached to the film entrance/exit of a 135 size film cartridge or the like.

As shown in FIG. 2, this 135 size film cartridge has one end fixed to the shaft of a spool shaft L, and the film 2 is wound into a cylinder with the emulsion side facing inside, and the other end is pulled out from the drawer opening 3. Exposed to the outside.

Reference numeral 4 denotes a photographic film cartridge outer cylinder, which has a cylindrical shape made of plastic or metal plate, and the film entrance/exit portion 3 is formed by the mating portions of both ends thereof. In order to prevent light from entering the inside of these cylinders 4, a light shielding member is attached to the entrance and exit.
When the photograph is completed, the film 2 is rewound into the film cartridge, taken out from the camera, and developed.

Another type of light-shielding film container for mounting a camera is a cartridge type, which is disclosed in Japanese Patent Application Laid-Open No. 62-235946,
It is also used in wide-width photographic materials such as those described in Japanese Utility Model Application Publication No. 62-23040, Japanese Utility Model Application Publication No. 62-57255, and Japanese Patent Application Publication No. 60-156058. Figure 3 shows a typical example. In Figure 3, ■ is the cartridge body;
The main body l includes an inner body 8 and an outer body 9 that encloses the inner body 8.
Consisting of It has a shaft supporting member 24,25 that can pivotally support both ends of the winding tube of the photosensitive material 2, and in the embodiment in the above publication, this shaft supporting member 24,25 is made of laminated cardboard and punched into a disk shape. Although there is an example in which something is rotatably supported, there is no limitation on the material, and it may be fixed as long as the load for pulling out the photosensitive material 2 is not unnecessarily large.

26 is an outlet (slit) for the photosensitive material 2;
6 is provided with a light shielding means 27. As the light shielding means 27, gap hole members 28 and 28' for passing the photosensitive material 2 are installed inside the slit 26 to face each other, and the gap hole members 28.
A light-shielding cloth 29, 29' is attached to the opposite surface of 28' to prevent outside light from entering. Note that the gap hole member 28
．． Although it is preferable to form the wall 28' obliquely on the wall surface as shown in the figure for light shielding purposes, it is not necessarily necessary to make it oblique. Also,
The gap members 28, 28' are reinforced to prevent deformation due to working methods.

The leading end 2' of the photosensitive material 2 is normally seen through the slit 26 and is ready for exposure. The slits and gap holes (hereinafter collectively referred to as slit holes) through which the photosensitive material of the photosensitive material patrone or cartridge (hereinafter collectively referred to as the magazine in the description of the present invention) enters and exits include: ■ Inside the magazine. In order to prevent light from entering, ■ To make it easier to take in and take out the photosensitive material, and ■ To prevent scratches on the back and front surfaces when taking in and out of the photosensitive material, a light shielding member with piles (see Figure 2) is used to prevent light from entering. 5a, 5b (29.29' in FIG. 3) are attached.

As described above, the inside of the film entrance/exit part of the magazine, that is, the slit hole, has an important function, and in particular, the front and rear ends of 5a, 5b, and 29. It is necessary to give sufficient consideration to the hardness of the pile.

In addition, in order to fully utilize the above-mentioned function, the gap size of the slit hole and the height H of the pile of the light shielding member (shade cloth) attached to the slit as shown in Fig. 4 must be very well balanced. It becomes important. That is, if the gap between the slit holes is made larger to make it easier to take the film in and out, the light-shielding properties will be incomplete, and in order to achieve complete light-shielding properties, the piles will be lengthened to increase the overlap between the piles on the opposing inner surfaces. , and if the gap between the slit holes is narrowed, it becomes difficult to take the film in and out, and at the same time, the front or back surface of the film is likely to be scratched.

In the process of manufacturing the light-shielding cloth having piles, there is a shearing process in which the lengths of the piles are made equal, and the height H of the piles is determined in accordance with the gap size of the slit holes. If staining is required, staining is performed. After that, a filler resin is applied to the back side of the light-shielding fabric to prevent the pile from falling out of the base fabric and to make the pile more stable. Furthermore, a hot-melt adhesive, for example, is applied to the back surface to adhere to the slit holes (FIG. 4(a)). When the light-shielding cloth made in this manner is attached to the slit hole of the magazine, for example, in the case of a metal magazine, the light-shielding cloth is thermocompression bonded to a rectangular metal plate base material.

Next, the magazine body is rolled up, film is loaded and capped to obtain a photographic film magazine.

The manufacturing process of the above-mentioned light-shielding cloth goes through various steps, but the one that requires special attention is the step in which pressure is applied to the pile surface.

That is, the pile is pushed down in the process of being subjected to pressure, and the height H of the pile rises and falls irregularly. The pressure-applying process includes a sealing resin coating process on the back side of the light-shielding cloth, an adhesive coating process, and a process of adhering the light-shielding cloth to a metal plate in the magazine manufacturing process.

The conditions (pressures) of these pressurized processes are different, and therefore the degree of collapse of the piles is different.

Also, during these processes, winding and squeezing pressure acts while being wound on a reel and stored, and the winding and squeezing pressure varies depending on the location.
For example, the pile of the winding core collapses. Therefore, when a magazine is finally manufactured through the above steps, it becomes very difficult to provide an appropriate slit hole gap to the pile fabric whose height H has irregular fluctuations.

Especially when the shearing process that determines the height H of the pile is preceded by a pressurized process such as the one mentioned above, calculating the degree of pile collapse in advance before shearing is actually a good idea in the subsequent process. The pile collapse varies depending on the degree of pressure applied, making it almost meaningless.

If the pile height is made to exceed a certain level by applying a safety factor to the way it falls, the piles of light-shielding cloth glued to the slit holes will naturally weigh on each other, increasing the torque required to pull out and rewind the film. Therefore, if foreign matter is attached to the pile surface, scratches will occur on the front and back surfaces of the film. On the other hand, if the pile height H is lower than necessary, light will enter through the slit holes, and the life of the film will be cut short due to light fogging. Ideally, the pile height H of the light-shielding cloth just before use should be measured and the slit hole gap should be adjusted to the height H, but this is impossible in actual work. Therefore, the current method is to set the gap between the slit holes to be relatively narrow, taking into account the degree of pile collapse of the shade cloth used.

On the other hand, the film sensitivity of recent photographic films is ISO10.
00, IsO1600, and ISO3200 have been developed, and along with this, it is desired to develop a magazine that further improves the wave light prevention function, that is, the light shielding ability, and also allows easy loading and unloading of film, and is resistant to scratches. It is rare.

[Purpose of the invention]

An object of the present invention is to provide a magazine containing high-sensitivity, high-quality photographic film and various photographic materials, in which the photographic materials can be easily taken in and taken out, without damaging the front or back surfaces of the materials, and in a light-blocking manner. The goal is to reliably and stably provide magazines with high quality.

[Structure of the invention]

The above-mentioned object of the present invention is to provide a photographic magazine having a pile on the inside of the photographic film entrance and a light-shielding woven fabric coated with a sealing resin, with the thickness error of the light-shielding woven fabric being 30% or less. This is achieved by using a photographic film magazine that is characterized by the fact that Further, in an aspect of the present invention, in the sealing and degreasing coating, the sealing resin liquid has a surface tension of 20-50 dyne/cm at room temperature of 25°C.
, and a viscosity of 1 to 3°Qcps is appropriate.

[Specific structure of the invention]

The pile light-shielding cloth used in the present invention is
As described in No. 1432, it may be a woven fabric in which piles are embedded in a certain standard on a base fabric woven with warp and weft intersecting regularly, or as described in Japanese Utility Model Application Publication No. 59-104143. It may be a towel cloth with a looped end of the pile as shown in the figure, or it may be constructed by electrostatic flocking as described in Japanese Utility Model Application No. 51-127737 and Japanese Patent Application Laid-open No. 53-105222. .

Materials used for the pile and base fabric of the pile light-shielding cloth of the present invention include, for example, polyamide-based materials such as nylon 6.6, polyester-based materials such as polyethylene terephthalate, polyester-based materials such as polyethylene, polyolefin-based materials such as polyethylene, and polyvinyl alcohol-based materials. , polyvinylidene chloride, polyvinyl chloride, acrylics such as polyacrylonitrile, acrylamide, methacrylamide, and rayon.

In order to obtain a light-shielding cloth that meets the purpose of the present invention, when applying sealing resin in the light-shielding cloth manufacturing process, a resin with good permeability is used, and the resin is applied not only to the back side of the base fabric but also to the base of the pile. Adopt a method to secure the pile and prevent it from falling. At this time, if the permeability is too good, the tip of the pile will be wetted with the resin due to capillary action, and as the resin solidifies, the pile will become rigid and lose its function as a light-shielding cloth. With conventional techniques, it was extremely difficult to control the permeability and apply the resin so that it did not reach the tips of the piles (Figure 4(b)).

As a result of extensive research, we have learned that the viscosity and surface tension of the resin coating liquid are extremely important in the sealing coating technology for light-shielding fabrics with piles.

In particular, the range that satisfies the purpose of the present invention is room temperature (25°C).
The viscosity is 1 to 300 cps, and the surface tension is 20 to 5.
Qdyna/011% particularly preferably 20 to 20 each
The coating liquid is adjusted to have physical properties in the range of 0 cps and 25 to 45 dyne/Cff1.

The sealing resin coating is generally performed using a reverse roll coater,
A transformer coater, a blade coater, a rod coater, a cored coater, etc. are used. As an auxiliary measure, if water coating is used as a preliminary step, the permeability can be improved by once wetting the coated surface and then coating the sealing resin while it is undried.

The filler resin used in the present invention has a relatively low viscosity (300 cp) among commonly commercially available resins.
s or less), there is no need to specifically limit it. Below are specific examples of sealing resins from commercially available products.
A or more may be used in combination. In addition, when these resins do not reach the specified viscosity and surface tension, they can be adjusted by diluting with water as necessary to the extent that emulsion formation is not impaired. In addition, when the adjustment is insufficient, especially when the surface tension has not reached the target value, it is possible to use methanol, acetone, etc. as an auxiliary means to control the surface tension.

When using these organic solvents, care must be taken because if too much is added, the stability of the emulsion may be broken and gelation may occur.

The light-shielding cloth coated with sealing resin is further provided with an adhesive layer for adhering to the inside of the slit hole of the magazine.

The adhesive layer is generally applied by using an extrusion coater, a roll coater, or the like, or by laminating an adhesive film on the back side of the light-shielding cloth.

The thickness of this adhesive layer also adds to the pile height H of the shading cloth,
The layer thickness variation naturally becomes a cause of error in the pile height H. Therefore, in the present invention, which aims to suppress errors in pile height as much as possible, a method of laminating with an adhesive film having a constant layer thickness is selected to further suppress errors in pile height. did it.

In the present invention, the adhesive for pasting the pile light-shielding cloth on the inside of the slit hole may be a polyolefin adhesive such as polyethylene described in JP-A No. 61-289347, or a vinyl acetate adhesive such as ethylene-vinyl acetate copolymer. Polymer systems, acrylic acid ester copolymer systems such as ethylene-ethyl acrylate and ethylene-isobutyl acrylate, nylon 6, nylon 66, nylon IO, nylon 12, N
- Polyamides such as methoxymethylated nylon, polyesters such as terephthalic acid, polyvinyl butyral, polyvinyl acetate, acetate, methyl cellulose,
Cellulose derivatives such as acetate butyrate, polymethacrylic acid esters such as polymethyl methacrylate,
Polyvinyl ether type such as polyvinyl methyl ether,
Polyurethane type, polycarbonate type, styrene block copolymer type such as styrene-ethylene-butylene-styrene, synthetic rubber type such as styrene-butadiene, isoprene, butyl rubber, or special rubber type not included in these, or not included in the above. 1 selected from acrylic copolymers, etc.
species or mixtures of 24 or more. In the case of paper cartridges, commonly sold double-sided adhesive tape may be used.

In the present invention, of the above, a hot-melt adhesive film is used for lamination;
.

Moreover, the light-shielding cloth used in the present invention is disclosed in Japanese Patent Application Laid-Open No. 62-286041.
No. 62-286042, antistatic treatment may be applied.

The shearing process of the light-shielding pile woven fabric coated with the filler resin as described above may be performed either before or after the filler resin coating, and it is possible to easily suppress the pile height H to an error of 30% or less. . FIG. 1 shows a cross-sectional view of a light-shielding cloth according to the present invention. In the figure, 1 is a pile, 2 is a warp, 3 is a weft, and 4 is a sealing resin layer hardened from the back of the base fabric to the root of the pile. 5 is an adhesive layer made of a laminated hot melt agent.

In the photographic film magazine of the present invention, metals forming the magazine body include, for example, steel, zinc, aluminum, copper, and alloys thereof. In addition, the surfaces of these metals are subjected to metal surface treatments such as phosphate film chemical formation, iron oxide film chemical formation, chromate film chemical formation, chromic acid-based oxide film formation, chromate diphosphate-based film formation. It's okay.

Further, when the magazine body is made of paper, cardboard or the like is used.

Furthermore, the surface of the metal is
It may be coated with the paint, ink, etc. described in No. 233738. Specific paints, inks, etc. include alkyd resins, amino-alkyd resins, vinyl resins, acrylic resins, epoxy resins, polyurethane resins, polyester resins, various anti-rust paints, water-based paints, cellulose derivatives, etc. Examples include paints, inks, etc.

Also, JP-A-60-26061, JP-A No. 60-26062
They can also be used in combination as described in No. 60-26063.

〔Example〕

Examples of the present invention are shown below. Of course, the present invention is not limited to this example.

Example 1 A light-shielding cloth under the conditions listed in Table 3 was prepared using a filler resin coating solution having the composition shown in Tables 1 and 2, and subjected to a pile collapse test.

(1) Sealing resin coating liquid prescription Resin-1 Ethylene-vinyl acetate resin Sevian A-2353 Resin-2 Ethylene-vinyl acetate resin Sevian A-2350 Resin-3 Nylon resin Resin FS-350 (2) Light shielding Cloth Preparation Pile Material Base Fabric Material Weaving Method Base Fabric Density Number of Piles Pile Height Resin Amount Coating Method % Formula % Plain Weave Vile V-hook Warp 55/cm Weft 22/cI11 50/cm 1.6 am 40g/m" Reverse roll coater thermal tilt tester type HG100 (newly manufactured by Toyo Seiki Co., Ltd.) Conditions: Temperature, pressure time, pile height measurement 100℃ 3 Kg/cm" 5ec (Note) Books Unadjusted means that the material has been melted to the extent that it can be coated, but the physical properties have not been adjusted.

(3)・Pile collapse test example-2 Using samples Nos. 5 to 10 prepared in Example-1, a laminate with a thickness of 65 μm was coated on the back side with hot melt type adhesive, and a 135 size film cartridge copper plate was coated. I made a cartridge by pasting it on, put a film in it, and conducted a light blocking test.

Light shielding test conditions were 100 OOLUX, 3 hours exposure,
After the exposure test, the film was developed, observed for the presence of light fog, and visually judged for the presence or absence of light leakage from the slit holes.

Number of piles pile height Amount of resin applied (2) Sealing resin 40/C11 1.6mm 35g/　m” A light-shielding cloth was manufactured using each of the following M resins as a sealing resin.

(1) Shade fabric manufacturing conditions Pile material Nylon 66 1000 52F Base fabric material Rayon 1200 40H weaving method Twill weave Pile V is base fabric density Warp 80/cta weft 40
Book/am The above resin liquid was adjusted to the surface tension and viscosity specified by the present invention with water or a solvent, and a coating method was appropriately selected according to the given liquid physical properties, and the resin was applied in a predetermined amount. However, comparative sample No. 11
No. 9 had a surface tension and a viscosity outside the scope of the present invention as long as it could be used as a resin (Surface tension: 55 dyne/
ctss viscosity; 350 cps).

Apply hot-melt adhesive (Hirodyne Industries Co., Ltd.; Hirodyne-7500) to the back side of these light-shielding cloths to a thickness of 70mm.
Coat μI laminate and attach it to a 135 size film cartridge copper plate, make a cartridge, insert the film (
36Exp), a cartridge function test was conducted.

Light-shielding test: Same method as Example-2, drawer tension
: Measured while pulling out the film at 40m5/sec (according to J15K-7519) : Visually judged scratches that occurred on the film when photographing using Konica Telephoto King.The above results are from sample No.119. In the case of , the sealing resin does not penetrate sufficiently, and the pile of the light-shielding cloth is not solidified enough and tends to fall down. In the case of cartridges with the same slit gap, light leakage occurs.

In addition, when preparing sample No. 110, the surface tension was adjusted to 17 dyne/crn, which is higher than the specification of the present invention, using methanol.
+l: When a TA-conditioned coating solution was prepared and applied, the coating solution was sucked up to the tip of the pile and solidified, making measurement impossible.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a light-shielding cloth according to the present invention. FIG. 2 is a sectional view perpendicular to the axis of the cartridge, and FIG. 3 is a partially cutaway perspective view. FIG. 4 is a sectional view of a conventional light-shielding cloth.

Claims (2)

[Claims] (1) In a photo magazine that has a pile on the inside of the photographic film opening and a light-shielding woven fabric coated with sealing resin is attached, the thickness error of the light-shielding woven fabric should be kept to 30% or less. Featured photographic film magazine. (2) The photographic film magazine according to claim 1, wherein in the sealing resin coating, the sealing resin liquid has a surface tension of 20 to 50 dyne/cm and a viscosity of 1 to 300 cps at room temperature.