JPH0566521A - Packaging container for photographic film - Google Patents

Abstract

PURPOSE:To improve the moldability of a plastic packaging container where a photographic film is housed, to reduce the cost of a mold, to enhance air tightness, to improve the opening/closing operability of the container and to hold the quality of the photographic film. CONSTITUTION:This container is constituted of a cap and a main body case 41 engaging with it, and the modulus of bending elasticity of the material of a cap is <=6000kg/cm<2> and smaller than that of the material of a main body case. A part of the cap is projected by about L 0.2-2.5mm from the outer wall of the aperture part of the main body case 41. Furthermore, force required for removing the cap is set at 0.5-2.0kg, and an undercut part 51 is provided so that its height may be 0.15-0.55mm. Roundness having the radius of >=0.15mm is made at the root of the part 51, a moisture permeable amount is regulated, and further the coefficient of linear expansion of the respective materials of the cap and the main body case 41 is regulated, and sealing ability is regulated according to ambient temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a packaging container for protecting a photographic film from humidity, dust and external force.

[0002]

2. Description of the Related Art Films containing 135 type cartridges are put in a synthetic resin case, covered with a synthetic resin cap, moisture-proof packaged, and then sold to users in a carton. ..

As a synthetic resin material, a polyolefin resin having a high barrier property and a high impact resistance is used.
Further, the cap and the main body case are generally manufactured by injection molding using these resins.

The cap is formed with a convex portion which is an undercut portion, and the main body case is formed with a portion which engages with the convex portion of the cap, and the cap and the main body form a container by these engagements. Had the form of.

[0005]

The contents required of a photographic film container are airtightness (moisture-proofness), cap removability, impact resistance, removability of contents (film with patrone), and production efficiency. Special mention was made and a design was made to answer these. Of course, it goes without saying that the film contained does not contain a substance harmful to the performance of the film, or even if it contains the substance, the amount is so small that it does not affect the performance.

However, in recent years, the environment in which photographic film is used has become very widespread, and the quality required for photographic film has been further increasing.

That is, there has been a demand for a packaging container capable of maintaining high quality film performance in the environment from the low temperature region to the high temperature and high humidity region.

From the low temperature to the room temperature, it is required that the container be easy to handle, the cap can be opened more easily, and the contents can be easily taken out.

In the high temperature and high humidity region (45 to 50 ° C.), airtightness is required to maintain the film performance sufficiently.

However, under these conditions, there is a problem that a slight "deviation" between the contact portion between the cap and the main body affects the moisture resistance and deteriorates the film performance.

To satisfy these demands, detailed examination of details is required.

[0012] However, conventionally, the above-mentioned demands have not been sufficiently designed, and therefore, detailed examination of details for satisfying the demands has become necessary.

That is, the flexural modulus of the cap and body case resin material, the shape of the cap and body case resin, the force required to remove the cap at room temperature (can open force), the shape of the undercut portion of the cap, Since the linear expansion coefficient of the resin material of the cap and body case affects the quality of the packaging container for photographic film,
It was necessary to define an appropriate range for these and provide an optimum container.

An object of the present invention is to solve the above problems and to provide a high-quality packaging container for photographic film with high productivity.

[0015]

Means and Actions for Solving the Problems The object of the present invention is to solve the above problems, and any one or some of the following technical means (a) to (g) are used. The purpose is achieved by combining.
The action of each technical means is also described.

(A) A packaging container for a photographic film, comprising a cap having an undercut portion on an outer peripheral portion or an inner peripheral portion, and a main body case having a portion engaging with the undercut portion, wherein The flexural modulus of the resin material is greater than or equal to the flexural modulus of the synthetic resin material for the cap, and the flexural modulus of the cap material is 6000 kg.
/ cm ² or less, further, a part of the cap is projected from the outer wall of the opening of the main body case, the length of this projection is 0.5 ~ 2.5mm for photographic film Packaging container.

Since the cap is removed by deforming the cap with respect to the main body case, the cap is dominant by making the bending elastic modulus of the synthetic resin material for the main case equal to or higher than the bending elastic modulus of the synthetic resin material for the cap. It will be transformed into and becomes easy to open.

If the bending elastic modulus of the cap material is large, the cap is less likely to be deformed, so that the bending elastic modulus (ASTM D74
For 7), 6000 kg / cm ² or less is desirable.

Further, by making a part of the cap protrude from the outer wall portion of the opening of the main body case by 0.5 to 2.5 mm, a part of the hand can be applied to this protruding portion and the can can be opened easily. If the length of the protrusion is less than 0.5 mm, it is very difficult to open the can because there is too little space to put a part of the hand on the other hand, if it is greater than 2.5 mm, deformation is concentrated on this protrusion and the can is opened. It becomes inconvenient and requires additional volume to be stored in the carton, resulting in inefficiency.

(B) In a photographic film packaging container comprising a cap and a main case that engages with the cap, a part of the cap projects from the outer wall of the opening of the main case, and the length of the projection is 0.5 to 2.5 mm, the bending elastic modulus of the cap material is 6000 kg / cm ² or less, and a part of the protruding portion of the cap is applied in a direction substantially perpendicular to the cap at room temperature (20 to 25 ° C). A packaging container for photographic film, wherein the force required to remove the cap when applied is 0.5 to 2.0 kg.

The force required to remove the cap, that is, the can-opening force, is the normal temperature (20 to 25 ° C.) of the cap when a part of the protruding portion of the cap is applied in a direction substantially perpendicular to the cap. It can be used without any problem if the force to remove it is 0.5 to 2.0 kg.

If the can opening force is less than 0.5 kg, the cap may be opened when the container is dropped, which is fatal. On the contrary, if it is greater than 2.0 kg, it becomes very difficult to open at low temperature.

The reason why it is more difficult to open at low temperature than at room temperature is that the flexural modulus of the resin material increases with a decrease in temperature from the viewpoint of the physical properties of the material.

It is desirable that the above force is 4 kg or less in the low temperature region.

(C) An undercut of a cap in a packaging container for a photographic film, comprising a cap having an undercut portion on an outer peripheral portion or an inner peripheral portion and a main body case having a portion engaging with the undercut portion. A packaging container for photographic film, characterized in that the height of the part is 0.15 to 0.55 mm.

(D) In a packaging container for photographic film, which includes a cap having an undercut portion on an outer peripheral portion or an inner peripheral portion and a main body case having a portion engaging with the undercut portion, an undercut of the cap is provided. A packaging container for photographic film, wherein the height of the portion is 0.15 to 0.55 mm, and the base of the undercut portion is rounded with a radius of 0.15 mm or more.

The cap and the main body case manufactured by injection molding of a synthetic resin material protect the contents by engaging the undercut portion of the cap with the portion of the main body case that engages with this, or on an industrial level. High quality caps and body cases must be produced efficiently.

The shape of the undercut portion of the cap is important not only for the engagement of the main body case 2 but also for the injection molding process.

That is, since it is an undercut portion, it is taken out with a momentary deformation when released from the mold, but if the height of the undercut portion is larger than 0.55 mm, it is crushed or locally deformed or Shavings occur, and as a result, the engagement with the main body case is affected. Further, if the height is less than 0.15 mm, the engagement with the main body case is insufficient, the cap comes off when it is dropped, and the moisture-proof performance is deteriorated.

Further, if the base of the undercut portion of the cap is rounded to have a radius of 0.15 mm or more, the resistance at the time of releasing from the mold is reduced, so that the undercut portion is not crushed and the molding cycle is prevented. It can be shortened and production efficiency can be improved.

With a radius smaller than 0.15 mm, the effect is extremely small.

(E) In a packaging container for photographic film consisting of a cap and a main case that engages with the cap, about 5 g of silica gel or calcium chloride having a water absorbing property is put in the packaging container for photographic film, and the temperature is 45 to 50 ° C. When left in an environment with a humidity of 80 to 90%, the moisture permeability for 10 hours is 10
A packaging container for photographic film, which is characterized by being less than or equal to mg.

(F) In a photographic film packaging container comprising a cap and a main case that engages with the cap, the linear expansion coefficient of the cap material is equal to or greater than the linear expansion coefficient of the main case material. A packaging container for photographic film.

In order to maintain the performance of the film during transportation or in a high humidity and high humidity area, it is desired that the airtightness is good under a high humidity environment of 45 to 50 ° C. Add 5g of calcium chloride and temperature 45 ~ 5
When left in an environment of 0 ° C and humidity of 80 to 90%, it is necessary that the amount of water permeated through the container within 48 hours and absorbed by silica gel or calcium chloride is 10 mg or less.

The cap and the container body are generally made of a polyolefin-based synthetic resin material. In the case of a polyolefin-based material, the range of linear expansion coefficient of the material is large, and the range greatly differs depending on the grade of the synthetic resin material. The cap and the main body container have a portion in close contact with each other near the opening of the main body container. Since the size of the cap is set to be slightly larger than the size of the container body in the close contact portion, when the cap and the container body 2 are fitted, there is a close contact effect and a moisture-proof function. When the temperature changes, the dimensions of the cap and body case change due to the linear expansion coefficient of the material compared to normal temperature. That is, the larger the linear expansion coefficient, the greater the change.

Considering the environment in which the film container is used, the moisture permeability is particularly affected in a high temperature and high humidity environment.

Therefore, if the linear expansion coefficient of the material for the cap is smaller than the linear expansion coefficient of the material for the main body case, the sealing property is good at room temperature, but worse at room temperature at high temperature and high humidity.
It is not always guaranteed under the environment where the moisture-proof function is most important.

On the contrary, if the linear expansion coefficient of the cap material is equal to or higher than that of the main body case material, it can provide a moisture-proof function equivalent to or higher than that at room temperature in a high temperature and high humidity environment. The film performance can be maintained.

(G) In a packaging container for a photographic film comprising a cap and a body case that engages with the cap, the sealing property is good at a temperature of 45 to 50 ° C., but at 60 ° C. or higher, the cap and the body case that engages with the body case. A packaging container for photographic film, characterized in that the fitting state with and the sealing performance is not good.

It is known that the performance of the film is deteriorated by temperature and moisture, and therefore the film is protected by a packaging container having a moisture-proof function.
It is enough to exert its function in the range of -50 ℃ and humidity of 80-90%.

Surprisingly, it was found that at high temperatures of 60 ° C. or higher, when a package having a high moisture-proof function is used, on the contrary, the film performance deteriorates.

This is because the film itself also has a water content, and if it is in a sealed state at a high temperature of 60 ° C., the inside of the container will be in a high temperature and high humidity state and the film will deteriorate.
Therefore, when the temperature is 45 to 50 ° C, the airtightness is good, but 60 ° C
By providing a packaging container for photographic film, which is characterized by poor fitability between the cap and the main body case that engages with the above, resulting in poor sealing performance, the film performance is protected from moisture in any state. can do.

[0043]

EXAMPLE As a packaging container for photographic film of the present invention, one for a cartridge film is used as an example.

The first embodiment is shown in FIG.
Will be described with reference to the respective cross-sectional views of the main body case of FIG. 3, the partial cross-sectional view showing the fitted and locked state of both of them, and the partial cross-sectional view of the cap of FIG.

The main body case 41 has an inner diameter portion 47 and a bottom portion 46, and is constituted by a thick portion 44 of an entrance / exit (opening portion) 47A and a thin portion 42 other than that.

The cap 50 is composed of a pressing portion 53 of the cartridge film body, a fitting surface 54 with the entrance / exit surface 47A of the main body case 41, and a substantially outer cylindrical portion 59 having an undercut protruding portion 51. It is configured.

The fitting surface 54 of the cap 50 is dimensioned so as to closely fit with the inlet / outlet surface 47A of the inner diameter portion 47 of the main body case 41 at room temperature. Then, the inner diameter portion 59A of the outer tubular portion 59 of the cap 50 and the outer peripheral surface 44 of the thick portion 44 of the main body case 41
A is not contact-fitted. However, the convex portion 51 touches the conical surface 45 at the base portion of the thick portion 44 and serves as a stopper.

The cap 10 and the body case 1 are made of polyolefin resin. This is somewhat flexible and has good impact resistance, so it is possible to forcibly remove the undercut portion during die-cutting during molding, which is convenient because there is flexibility in low-cost design and production of the die. Because. The bending elastic modulus of the body case material is larger than that of the cap material.

The cap 50 has a flexible structure that can be deformed in terms of shape so that it can be easily attached to and detached from the main body case 41. In terms of material, a polyolefin resin material such as polyethylene is used. Are using.

The cap 50 is fitted into the main body case 41 by fitting the outer peripheral surface 44A of the main body case with the convex portion 51 of the outer tubular portion 59 of the cap 50 slidingly, and finally the conical surface 45. You can be firmly fixed. And the mating surface of the cap 50
The fitting between the 54 and the entrance / exit surface 47A of the inner diameter portion 47 of the main body case 41 is a fitting with high adhesion.

Further, as shown in FIG. 3, a part of the cap projects a length L from the outer wall of the opening of the main body case, and the cap can be easily removed by utilizing this projection.

L is 0.5 to 2.5 mm, preferably 0.8 to 1.5 mm.

As shown in FIG. 3, when a force is applied to a part of the protruding portion of the cap in the direction of the arrow, the force F for removing the cap is designed to be 0.5 to 2.0 kg at room temperature (20 to 25 ° C.). Has been done.

Convex part for undercut which is an undercut part
51 is important in terms of the cap removal force and the productivity in the injection molding process.

FIG. 9 shows the bending elastic modulus of the cap material and the force required to remove the cap, that is, the can-opening force F, with the height h of the undercut portion as a parameter in a cap having an outer cylinder wall thickness of 0.95 mm. It shows the relationship of.

The preferred area is within the shaded area in the figure.

Since the convex portion 51 is an undercut portion, the height of the convex portion determines the cycle of injection molding.

That is, if the height of the convex portion is too high, a part of the convex portion is scraped off or greatly deformed when the molded product is taken out of the mold, so that when the main body case is fitted, the engagement is unsatisfactory. It may become sufficient, and the cap may come off during transportation and the moisture-proof function may be impaired, resulting in a fatal defect.

Therefore, it is necessary to keep the height of the convex portion within an appropriate range so that the convex portion is not scraped or deformed during high cycle molding.

Further, in order to prevent the convex portion from being scraped or deformed, a radius of 0.15 mm like 51a, 51b at the base of the convex portion.
It has been found that the above roundness is effective.

51b is particularly effective for 51a and 51b.

The following table shows that the cap bending elastic modulus is about 1000 kg / c.
It shows the moldability using the material of m ² .

[0063]

[Table 1]

[0064]

[Table 2]

Table 1 shows the effect of changing the height of the convex portion with a molding cycle of 10 seconds.

1000 shots of continuous molding were carried out, and those having no problem in the shape of the convex portion were good, those having a slight deformation were good, and those having a large deformation were not good. .. If at least one of the shapes is greatly deformed, it is regarded as impossible.

Table 2 shows the molding cycle when the height h of the convex portion is 0.4 mm. Simultaneously with the above test, continuous 1000 shots were molded and evaluated.

As can be seen from these results, it was confirmed that the height h of the convex portion was set to 0.55 mm or less and the root was rounded to have a radius of 0.15 mm or more, which had a remarkable effect on the molding surface. Detailed results are omitted for the roundness of the root, but it has been confirmed that the effect is not so great when it is smaller than 0.15 mm.

Regarding the cross-sectional shape of the convex portion, it is desirable that it has a substantially arc shape as shown in FIG. 4 (a), a substantially triangular shape as shown in FIG. 4 (b), or a shape similar thereto.

If the height of the convex portion is too high, it causes a problem in molding. On the contrary, if it is too small, the engagement with the main body case becomes insufficient, the cap comes off when dropped, and the contents cannot be protected. Needless to say.

From the above, the height h of the convex portion is 0.15 to 0.55 mm,
It is necessary to add a radius of 0.2 to 0.4 mm, and a radius of 0.15 mm or more, preferably 0.2 to 0.4 mm to the root of the convex portion. It has become possible to obtain a package having an appropriate can openability.

[0072] Although the inner diameter D ₀ of the main body case is about Fai30.0Mm, than the inside diameter D ₀ of the diameter D ₀ 'is the main body case of the fitting surface of the cap into the opening of the internal diameter D _0, at room temperature It is slightly larger. As a result, the fitting surface of the cap and the inner wall surface of the opening of the main body case are in close contact with each other to prevent moisture permeation from the outside.

In order to make the prevention function effective, it is preferable that the diameter of the fitting surface of the cap is larger than the inner diameter of the opening of the main body case by 0.2 to 0.5 mm at room temperature. 0.2 m
If it is smaller than m, it cannot be said that the moisture-proof function is insufficient due to dimensional variations in molding, and if it is larger than 0.5 mm, it may be difficult to fit the cap to the case.

In order to guarantee a high quality film, about 5 g of silica gel or calcium chloride having a water absorbing property is put in a film container, and when it is left in an environment of a temperature of 45 to 50 ° C. and a humidity of 80 to 90%, it is 48 It has been found to be achieved by providing a packaging container which has a moisture vapor transmission rate per hour of 10 mg or less, preferably 8 mg or less, more preferably 6 mg or less.

Further, the dimension of the resin material changes according to the coefficient of linear expansion peculiar to the material as the temperature changes.

That is, the dimensions increase at high temperatures and decrease at low temperatures.

It can be said that the greatest function of the film container is the moisture proof property, which is regarded as a problem especially in a high temperature and high humidity environment.

It has already been described that this problem can be solved by setting the coefficient of linear expansion of the cap material to be equal to or higher than the coefficient of linear expansion of the material of the main body case. The following is an example of the present content.

The cap has a linear expansion coefficient of about 17.5 × 10 ⁻⁵ cm / c.
m ℃, the material of the body case has a coefficient of linear expansion of about 10.0 × 10 ^-5 cm / cm ℃, and when the temperature is raised from room temperature 20 ℃ to 50 ℃, the size of the mating surface of the cap φ30.2mm (normal temperature At 50 ° C, the expansion becomes φ30.36mm, which is 0.16mm larger.

The inner diameter of the opening of the main body case is room temperature 20 ° C.
With a diameter of 30.0 mm, the diameter is 30.09 mm at 50 ° C, which is 0.09 mm larger.

Therefore, at room temperature {(fitting diameter of cap)
-(Body case opening diameter)} was 0.2 mm but 50
It increases by 0.27 mm and 0.07 mm at ℃, and the adhesiveness is improved by this amount, which is effective for the moisture-proof function at high temperature and high humidity. The difference between the linear expansion coefficient of the cap material and the linear expansion coefficient of the body case is
Desirably 3.0 × 10 ^-5 cm / cm ℃ or more, more desirably 5.
0 × 10 ^-5 cm / cm ℃ is good.

As a result, the temperature is 45 to 50 ° C. and the humidity is 80 to 90.
%, The moisture permeability in 48 hours when about 5 g of silica gel or calcium chloride having a water-absorbing property was put in the film packaging container even under a severe condition of 10% was able to be reduced to 10 mg or less.

Further, at a temperature of 45 to 50 ° C., the hermeticity is good, but at a temperature of 60 ° C. or more, the fitting state between the cap and the main body case engaging with it is poor and the hermeticity is not good. By providing the container, the film performance could be protected from moisture in any environment.

Examples A and B of the present content will be described below.

When A is 60 ° C. or higher, the cap comes off and the hermeticity is deteriorated, and when B is 60 ° C. or more, the cap does not come off and the hermeticity is good.

Films for both A and B are Konica Color Super
Uses DD-100-24EXP.

Test 1 It was left in a car with a resin can consisting of a cap and a body case in a car for five days on a sunny day in August.

Test 2 Left at 60 ° C.-5 days in thermo test chamber.

Test 3 65 ° C.-2 days left in thermo test chamber.

Results The ΔD of the Reg layer is shown below, where ΔD is the difference in FogD from the sample stored at room temperature.

Test 1 Test 2 Test 3 A 0.05 0.06 0.05 B 0.18 0.21 0.19 In this way, the test product A, which is designed so that the cap and the body case are not fitted well at 60 ° C. or more and the sealing property is not good, is obtained. Compared to B which is not so, there is a clear difference in the performance of the film, which is excellent.

Although the seven embodiments of the present invention have been described with reference to the first embodiment, the second embodiment also includes the seven embodiments of the present invention. Therefore, the cap sectional view of FIG. 5 and the body case of FIG. A description will be given with reference to the cross-sectional view, the cross-sectional view of both of FIGS.

The main body case 1 has an inner diameter portion 4 having an inner diameter D ₁ and an undercut concave portion 5 and a bottom portion 6, and is constituted by a thick portion 3 at the entrance and exit and a thin portion 2 other than that.

The cap 10 is composed of a pressing portion 13 of the cartridge film body, a top portion 12, a fitting portion 9 having a body case 1 having an undercut convex portion 11, and a concave portion 8 on the top surface. It also has the necessary structural flexibility when fitting the cap.

The fitting portion 9 and the convex portion 11 of the cap 10 are fitted and sealed in the inner wall 4 and the concave portion 5 of the entrance / exit (opening portion) of the main body case 1.

The moisture-proof property is such that the fitting portion 9 of the cap 10 and the inner wall 4 of the entrance / exit surface 7 are in close contact with each other, or the minimum portion 5a of the recess 5 is
And the vicinity of the highest portion 11a of the convex portion 11 are brought into close contact with each other.

The bending elastic modulus of the cap material is not more than the bending elastic modulus of the main body material, and the bending elastic modulus of the cap material is 6000.
At kg / cm ² or less, part of the cap projects 0.5 to 2.5 mm from the outer wall of the opening of the main body case. When a force F is applied to a part of the protruding portion, the cap is opened with a force of 0.5 to 2.0 kg at room temperature.

Convex portion 11 which is the undercut portion of the cap
Has a height of 0.15 to 0.55 mm and has a radius R _{2 of} 0.15 mm or more at its root.

High temperature and high humidity (45 ° C to 50 ° C, 80 to 90%)
Depending on the time, add about 5 silica gel or calcium chloride to the container.
When added, the moisture vapor content for 48 hours is 10 mg or less.
At temperatures above 60 ° C, the fitting condition between the cap and the body case deteriorates, resulting in poor sealing.

As in the first embodiment, the coefficient of linear expansion of the cap material is greater than or equal to the value of the coefficient of linear expansion of the main body case material, and the same effects as those of the first embodiment are obtained. ..

Although the above two embodiments have described the packaging container of the film containing the cartridge, the present invention is not limited to this.
The photographic film may be 120 type or any other type.

[0102]

According to the first aspect of the present invention, the cap can be easily opened and the size of the packaging container can be reduced without increasing the size.

According to the second aspect of the present invention, the hermeticity that can withstand the impact at the time of dropping is maintained and the operation at the time of can opening becomes easy.

According to the third invention or the fourth invention, injection molding can be performed accurately and easily, a process with high productivity can be assembled, and a stable and high-quality container can be obtained.

According to the fifth invention, a container having good airtightness under high temperature and high humidity can be obtained, and high quality film guarantee can be obtained.

The sixth aspect of the present invention makes it possible to stably obtain the close contact holding property between the cap and the main body container in a high humidity environment.

According to the seventh invention, the photographic film is not adversely affected when it is kept in a sealed state at 60 ° C. or higher.

As described above, the above effects and their synergistic effects can be exhibited by combining at least one or several of the present invention.

[Brief description of drawings]

FIG. 1 is a sectional view of a cap according to a first embodiment.

FIG. 2 is a sectional view of a main body case according to the first embodiment.

FIG. 3 is a partial cross-sectional view showing a fitted and locked state of the cap and the main body case in the first embodiment.

FIG. 4A is a partial cross-sectional view of the cap according to the first embodiment. (B) is a fragmentary sectional view of the other embodiment.

FIG. 5 is a sectional view of a cap according to a second embodiment.

FIG. 6 is a sectional view of a body case according to a second embodiment.

FIG. 7 is a partial cross-sectional view showing a fitted and locked state of the cap and the main body case in the second embodiment.

FIG. 8 is a partial cross-sectional view of the cap according to the second embodiment.

FIG. 9 is a graph showing the relationship between the bending elastic modulus of the cap and the can-opening force.

[Explanation of symbols]

 1,41 Body case 2,42 Thin part 3,44 Thick part 4,47 Inner diameter 5 Recessed part 6,46 Bottom part 7,47A Entry / exit surface 10,50 Cap 11,51 Convex part 14A, 14B Root part 54 Fitting surface 51a, 51b Root

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location G03C 3/00 N 8910-2H

Claims (7)

[Claims] 1. A packaging container for a photographic film, comprising a cap having an undercut portion on an outer peripheral portion or an inner peripheral portion and a main body case having a portion engaging with the undercut portion, wherein the synthetic resin for the main body case is used. The flexural modulus of the material is not less than the flexural modulus of the synthetic resin material for the cap, and the flexural modulus of the cap material is 6000 kg / cm ² or less, and further, a part of the cap is an opening of the main body case. It projects from the outer wall of the part, and the length of this projection is
A packaging container for photographic film, which is 0.5 to 2.5 mm. 2. A photographic film packaging container comprising a cap and a main case that engages with the cap, wherein a part of the cap projects from an outer wall of an opening of the main case, and the length of the projection is 0.5. ~ 2.5 mm, the bending elastic modulus of the cap material is 6000 kg / cm ² or less, and a part of the protrusion of the cap is applied in a direction substantially perpendicular to the cap at room temperature (20 to 25 ° C). A packaging container for photographic film, characterized in that the force required to remove the cap is 0.5 to 2.0 kg. 3. A packaging container for photographic film, comprising: a cap having an undercut portion on an outer peripheral portion or an inner peripheral portion; and a main body case having a portion engaging with the undercut portion, wherein an undercut portion of the cap is provided. A packaging container for photographic film, characterized in that the height is 0.15 to 0.55 mm. 4. A packaging container for a photographic film, comprising a cap having an undercut portion on an outer peripheral portion or an inner peripheral portion, and a main body case having a portion engaging with the undercut portion, wherein an undercut portion of the cap is provided. Is 0.15 to 0.55 mm, and the base of the undercut is rounded to have a radius of 0.15 mm or more. 5. A packaging container for a photographic film comprising a cap and a main case that engages with the cap, wherein about 5 g of water absorbing silica gel or calcium chloride is put in the packaging container for a photographic film, and the temperature is 45 to 50 ° C. and the humidity is 50 ° C. 80 ~
A packaging container for photographic film, which has a moisture permeability of 10 mg or less for 48 hours when left in a 90% environment. 6. A photographic film packaging container comprising a cap and a main body case engaging with the cap, wherein the linear expansion coefficient of the cap material is equal to or larger than the linear expansion coefficient of the main case material. Packaging container for photographic film. 7. A packaging container for photographic film comprising a cap and a main body case engaging with the cap, wherein the temperature is 45 to
A packaging container for photographic film, which has a good sealing property at 50 ° C, but has a poor fitting condition between a cap and a main body case engaging with it at 60 ° C or higher, resulting in poor sealing property.