JP2000310834A - Light shielding long-length plastic sheet and package for roll type photosensitive material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light shielding long-length plastic sheet which can be easily brought into contact with the outside surface of a light shielding flange and suitably used for a light shielding leader and also to provide a package for roll type photosensitive material which is excellent in light shielding ability and can be industrially easily produced. SOLUTION: On this sheet, temperature showing 5 to 30% in a length direction and <5% in a width direction exists within a range where thickness is 30 to 200 μm and the coefficient of contraction is 60 to 140 deg.C. As for this package, the light shielding sheet made of such a sheet wider than a distance between the outside surfaces of the light shielding flanges 2a and 2b at both ends of a core 3 to both ends of which the flanges 2a and 2b are attached is wound round the roll type photosensitive material formed by winding long- length photosensitive material round the core 3 at least one round or more, and both ends of the light shielding sheet are brought into contact with the outside surfaces of the flanges 2a and 2b by thermal contraction of the light shielding sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-shielding plastic sheet suitable for packaging a roll-shaped photosensitive material, and a roll-shaped photosensitive material package.

[0002]

2. Description of the Related Art A light-shielding plastic sheet attached to the end of a roll of photosensitive material, such as a long photographic paper, which is wound around a core having light-shielding flanges at both ends and provided at the end of the winding of the long photosensitive material. A light-sensitive material package around which a light-shielding leader is wound, wherein the light-shielding leader is wound so as to cover the outer surfaces of the light-shielding flanges provided at both ends. Since it is difficult to form a gap to enter the photosensitive material, it is considered that the photosensitive material is hardly exposed to light during storage and transportation, and various types of such packages that can be easily manufactured industrially have been proposed.

[0003] Japanese Utility Model Laid-Open Publication No. 4-85438 discloses a package in which light-shielding readers having elasticity at both ends cover the outer surface of a light-shielding flange. Also, JP-A-8-6
No. 2,783, the elastic modulus is from 1300 to 5000 kg.
There has been proposed a package in which a light-shielding leader of 2 mm / cm ² covers at least 2 mm from the end of the outer surface of the light-shielding flange toward the center thereof. According to these publications, it is possible to easily manufacture a package in which the light-shielding leader is wound around the roll-shaped photosensitive material while applying tension to the outer surface of the light-shielding flange and covered with the light-shielding leader. .

[0004]

SUMMARY OF THE INVENTION The present inventor has found that even in a package in which the outer surface of the light-shielding flange is covered with the light-shielding leader, the portion covering the outer surface of the light-shielding flange of the light-shielding reader (both ends of the light-shielding reader). If the outer surface of the light-shielding flange is not in close contact with the light-shielding flange, cracks may occur at both ends of the light-shielding reader during transportation, or the light-shielding reader may come off the light-shielding flange and light may enter the photosensitive material. I noticed that there was something. Then, the present inventor has investigated the cause of cracks in the light-shielding leader or the light-shielding leader detaching from the light-shielding flange, and found that the tape stopping the end of the winding end of the light-shielding leader due to the impact during transportation. Peeled off, the light-shielding leader is detached from the light-shielding flange, or the portions of both ends of the light-shielding leader that are not in close contact with the outer surface of the light-shielding flange are bent by contacting the inner surface of the cardboard container containing the package. It was found that cracks occurred in the light-shielding leader and that the light-shielding leader came off the light-shielding flange.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a light-shielding long plastic sheet used for a light-shielding reader or the like which can be easily adhered to the outer surface of a light-shielding flange. To provide. Further, an object of the present invention is to prevent cracks at both ends of the light-shielding plastic sheet (light-shielding leader) and to prevent the light-shielding plastic sheet (light-shielding leader) from coming off the light-shielding flange. Another object of the present invention is to provide a roll-shaped photosensitive material package which has few portions where both ends of the light-shielding leader and the outer surface of the light-shielding flange are not in close contact with each other and can be easily manufactured industrially.

[0006]

The inventor of the present invention has made it possible to prevent the both ends of the light-shielding reader and the outer surface of the light-shielding flange from being in close contact by thermally shrinking the light-shielding leader wound on the roll-shaped photosensitive material in the winding direction. We have found that the number of parts can be reduced. Furthermore, as a result of the study by the present inventors, if the shrinkage ratio in the winding direction of the light-shielding reader is too large, the length of the light-shielding reader in the winding direction becomes too short due to heat shrinkage, and there is a gap where light enters. It has been found that when the shrinkage ratio in the width direction of the light-shielding leader is large, the width of the light-shielding reader becomes short and the outer surface of the light-shielding flange cannot be covered. Further, if the heat shrinkage starting temperature of the light-shielding reader is 60 ° C. or less, the light-shielding reader thermally shrinks due to storage or storage temperature history during transportation. If the light-shielding leader is stuck to the light-shielding flange simultaneously with the contraction, or if the light-shielding leader is wrapped around the roll-shaped photosensitive material twice, the light-shielding readers are blocked (welded), making it difficult to peel the light-shielding leader from the package. It turned out that there was something.

Accordingly, the present invention has a thickness of 30 to 200 μm.
m, and the shrinkage ratio specified in JIS Z 1709 is within the range of 60 to 140 ° C. and 5 to 30 in the length direction.
%, And a temperature of less than 5% in the width direction is present in the light-shielding long plastic sheet.

The present invention also relates to a roll-shaped photosensitive material obtained by winding a long photosensitive material around a core having light-shielding flanges attached to both ends, the width being larger than the distance between the outer surfaces of the light-shielding flanges attached to both ends. Wide and 30-200μ thick
m, and the shrinkage ratio specified in JIS Z 1709 is in the range of 60 to 140 ° C. and 5 to 3 in the winding direction.
A light-shielding plastic sheet having a temperature of 0% and less than 5% in the width direction is wrapped at least once around the light-shielding plastic sheet. There is also a roll-shaped photosensitive material package characterized by being closely attached.

In the above roll-shaped photosensitive material package, it is preferable that the end of the end of the long photosensitive material wound around the core is connected to the light-shielding plastic sheet.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a light-shielding long sheet of the present invention will be described. The light-shielding long sheet of the present invention has a thickness of 30 to 200 μm and a shrinkage ratio defined in JIS Z 1709 of 60 to 140 ° C. in a range of 5 to 30% in a length direction and a width direction. Characterized in that a temperature indicating less than 5% is present. The thickness is 7
It is preferably from 0 to 150 μm, more preferably from 80 to 130 μm. The shrinkage in the length direction is preferably from 10 to 30%, more preferably from 15 to 30%. The shrinkage in the width direction is preferably less than 4%, more preferably less than 3%. The ratio of the shrinkage ratio in the length direction to the width direction (shrinkage ratio in the length direction / shrinkage ratio in the width direction) is preferably 3 or more, more preferably 4 or more, and even more preferably 5 or more. . In addition, the temperature range showing the above-mentioned shrinkage rate is preferably 80 to 120 ° C., and 90 to 11 ° C.
The temperature is more preferably 0 ° C.

The long light-shielding sheet of the present invention may be a single-layer sheet or a laminated sheet of two or more layers. That is, the light-shielding long sheet of the present invention is a single-layer heat-shrinkable plastic sheet to which a colorant such as carbon black is added, and a colorant such as carbon black is added to a transparent heat-shrinkable plastic sheet. Including paint,
Alternatively, it may be a laminated sheet in which a light-shielding plastic film to which a coloring agent such as carbon black is added is disposed on a heat-shrinkable plastic film. In addition, when using carbon black as a coloring agent, the addition amount is preferably 1 to 5% by weight, and 2 to 4% by weight.
Is more preferable.

The resin material of the light-shielding long sheet of the present invention is, for example, polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polystyrene, polyester, or a mixture of these resins and an amorphous polyolefin resin. Blend resins and the like can be mentioned. Among these, a blend resin obtained by mixing a resin such as polyethylene and an amorphous polyolefin-based resin is preferred. The content of the amorphous polyolefin resin in the blend resin is preferably from 5 to 90% by weight, more preferably from 60 to 90% by weight, and still more preferably from 70 to 80% by weight. By increasing the content of the amorphous polyolefin-based resin, the crystallinity of the light-shielding long sheet is reduced and the shrinkage ratio is increased, but if the content of the amorphous polyolefin-based resin is too large, physical Strength decreases. Preferred examples of the amorphous polyolefin-based resin include a cyclic olefin copolymer. Amorphous polyolefin resin is
The glass transition temperature (Tg) is preferably from 60 to 120 ° C, more preferably from 60 to 100 ° C.

The resin material of the light-shielding long sheet according to the present invention comprises:
It is preferable to use a blend resin of a polyethylene resin and an amorphous polyolefin resin. Examples of polyethylene resins include low density polyethylene (LDPE), linear low density polyethylene (LLDPE), and high density polyethylene (HDPE). These polyethylene resins can be used as a mixture.

A method for producing the light-shielding long sheet of the present invention includes a melt extrusion method, and an inflation method is particularly preferable. When the light-shielding long sheet of the present invention is manufactured by an inflation method, it is preferable to set a blow-up ratio (blow ratio) to 0.5 to 1.5.

When the light-shielding long sheet of the present invention is used as a light-shielding leader, it is wound around a roll-shaped photosensitive material two or more times and thermally shrinked, and sometimes the light-shielding readers are blocked (welded).
As a result, it may be difficult to unwind the photosensitive material sheet. When the material of the light-shielding long sheet is made of a blended resin of polyethylene and an amorphous polyolefin-based resin so that blocking (welding) of the light-shielding long sheets during heat shrinkage does not easily occur. It is preferable to form a thermosetting resin layer on the surface of the light-shielding sheet or to add a resin having excellent heat resistance. Examples of the resin having excellent heat resistance include polypropylene.

FIG. 14 is a sectional view showing an example of the light-shielding long sheet of the present invention having a laminated structure. The light-shielding long sheet having the laminated structure shown in the figure has a light-shielding plastic film 13 disposed on both surfaces of a heat-shrinkable plastic film 12. The long light-shielding sheet of the present invention having a laminated structure may have the light-shielding plastic film 13 disposed on only one surface of the heat-shrinkable plastic film 12.

The heat-shrinkable film 12 generally has a thickness of 10 to 100 μm, preferably 12 to 60 μm, more preferably 30 to 50 μm, and is a light-shielding film (shows little or no heat-shrinkability). 13 generally has a thickness of 20 to 100 μm, preferably 20 to 50 μm.
μm, and more preferably 23 to 40 μm. The light-shielding plastic film 13 is made of a resin material and a coloring agent such as carbon black. As the resin material, a known material such as a polyethylene resin can be used.

The heat-shrinkable plastic film 12 is manufactured by Randy Five RC, HS, VP-
B, VP-3B, SE, DXL21 manufactured by Mitsubishi Plastics, Inc.
9-01, 219-02, 219-04, 219-4
Commercially available shrink films such as 5,219-54, 250-40, Fancy Wrap GSA and GS7 manufactured by Gunze Co., Ltd., and Super Shrink manufactured by Heisei Polymer Co., Ltd. may be used.

Next, the roll-shaped photosensitive material package of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing an example of the roll-shaped photosensitive material package of the present invention. The package 1 is formed by winding a long photosensitive material (not shown) around a core 3 having light-shielding flanges 2a and 2b attached to both ends, and a distance between outer surfaces of the light-shielding flanges 2a and 2b. The light-shielding reader 4 having a wider width is wound around at least one turn, and both ends of the light-shielding reader are brought into close contact with the outer surfaces of the light-shielding flanges 2a and 2b by thermal contraction of the light-shielding reader. The end of the light-shielding leader 4 at the end of the winding is stopped by an adhesive tape 5.

FIG. 2 is a sectional view showing an example of the vicinity of the light-shielding flange of the roll-shaped photosensitive material package. The package 1a is formed by wrapping the light-shielding reader 4 around the outer periphery of the photosensitive material 6 once. Since the light-shielding reader 4 is in close contact with the inner side surface and the outer side surface of the light-shielding flange 2, it is difficult for the light-shielding flange 4 to come off from the light-shielding flange, and it is hard for the light-shielding flange and the core to come off. The length of the inner surface of the light-shielding flange 2 that is in close contact with the light-shielding reader is 30 mm.
It is preferable to set the following.

FIGS. 3, 4 and 5 are cross-sectional views of one example of the vicinity of the light-shielding flange of another roll-shaped photosensitive material package.

The package 1b shown in FIG. 3 is formed by winding the photosensitive material 4 so as to be thicker than the diameter of the flange portion of the light shielding flange 2. In the package of the present invention, since the outer surface of the light-shielding flange 2 and the light-shielding reader 4 are in close contact with each other due to the heat shrinkage of the light-shielding reader 4, even if the photosensitive material is wound so as to be larger than the diameter of the flange portion of the light-shielding flange. It is difficult to form a gap between the light shielding flange and the photosensitive material. The distance between the outer peripheral portion of the photosensitive material and the outer peripheral portion of the light-shielding flange is preferably set to 60 mm or less.

In the package 1c shown in FIG. 4, the cross section of the light shielding flange 2 is tapered. By making the cross section of the light shielding flange 2 tapered, the photosensitive material 4
When the light-shielding reader 6 is wound around the photosensitive material around the core,
It becomes difficult to be caught on the inner surface of the light shielding flange 2. Further, the light-shielding reader 6 and the inner side surface of the light-shielding flange 2 are easily adhered to each other.

The package 1d shown in FIG. 5 has a light shielding flange 2 provided with a recess on the outer surface. By bringing the light-shielding reader 4 into close contact with the recess on the outer surface of the light-shielding flange 2, the light-shielding reader 4 is less likely to be rubbed or cut,
The light-shielding reader 4 does not easily come off the light-shielding flange 2.

FIGS. 6 to 9 are sectional views showing an example of the vicinity of the light-shielding flange of the roll-shaped photosensitive material package in which the light-shielding leader is wound around the photosensitive material twice.

Each of the packages shown in FIGS. 6 to 9 has at least an outer light-shielding reader (hereinafter referred to as an outer reader portion) 8 of the doubly wound light-shielding reader 4.
Is adhered to the outer surface of the light-shielding flange 2.
The package 1e shown in FIG. 6 has a light-shielding leader 4 (hereinafter referred to as an inner leader portion) 7 which is wound inside the light-shielding reader 4 which is double-wound, and is closely attached to the inner surface of the light-shielding flange 2. . The package 1f shown in FIG. 7 has the inner leader portion 7 brought into close contact with the edge of the light-shielding flange 2. The package 1g shown in FIG. 8 has the inner leader portion 7 closely attached to the outer surface of the light shielding flange 2 and the outer leader portion 8 further closely adhered to the outer surface of the light shielding flange 2. The package 1h of FIG.
The outer leader portion 8 and the outer leader portion 8 are closely attached to the outer surface of the light-shielding flange 2 by two sheets. In any of the packages, the light-shielding function is enhanced because the light-shielding reader is doubled. Further, even if the outer leader is damaged due to vibration or dropping during transportation of the package, the photosensitive material is less likely to be exposed unless the inner leader is damaged.

FIG. 10 is a front view of an example of the light-shielding reader used in the package shown in FIGS. The light-shielding reader 4a includes an inner reader portion 7, an outer reader portion 8,
The end portion 9 is integrally connected and the photosensitive material is directly connected to the inner leader portion 7. Direction length L ₁ the winding of the inner leader portion 7 has a length of the outer periphery of the photosensitive material wound on at least a roll, the winding direction of the outer leader portion 8 length L ₂ is at least the light-shielding flange It is necessary to have a perimeter length. The width direction length W ₁ of the inner leader portion 7 is the distance between the inner surface of at least the light-shielding flange, the distance between the outer surfaces of the width-direction length W ₂ of the outer leader portion 8 at least the light-shielding flange It is. Here, W is the width of the photosensitive material.

FIG. 11 is a front view of another example of the light-shielding reader used in the package shown in FIGS.
In the light-shielding reader 4b, a photosensitive material connecting portion 10, an inner leader portion 7, an outer leader portion 8, and a terminal portion 9 are integrally connected in this order via a tapered portion 11, and the photosensitive material is connected to the photosensitive material connecting portion. 10 is connected. By providing the tapered portion 11, when the light-shielding reader is wound around the photosensitive material by applying tension, the concentration of stress on the connection side between the portions is reduced, and thus high-speed winding becomes possible. It is preferable that the length Z in the winding direction of the tapered portion 11 be equal to or more than 外 周 of the length of the outer periphery of the photosensitive material. Further, when the tapered portion 11 is wound around the photosensitive material, it is possible to form a curved path of light three-dimensionally, and it is possible to enhance the light shielding property of the package. The direction of the length L ₁ the winding of the inner leader portion 7, the direction of the length L ₂ wound outer leader portion 8, the width direction length W ₁ of the inner leader portion,
Widthwise length W ₂ of the outer leader portion is the same as the above light-shielding leader.

FIG. 12 is a front view of an example of the light-shielding reader used in the package shown in FIG. The light-shielding reader 4c includes a photosensitive material connecting portion 10, an inner leader portion 7, an outer reader portion 8, and a terminal portion 9; And the photosensitive material is connected to the photosensitive material connecting portion 10. Tapered part 11
Winding direction length Z, and the direction of the length L ₁ the winding of the inner leader portion 7, the direction of the length L ₂ wound outer leader portion 8, the inner leader portion, and the width direction length W ₂ of the outer leader portion Is the same as the light-shielding reader described above.

In the package of the present invention, a light-shielding reader connected to the end of the winding end of the long photosensitive material is provided on the outer periphery of the roll-shaped photosensitive material in which the long photosensitive material is wound around a winding core having light-shielding flanges at both ends. It can be manufactured by winding one or more turns to fix the end portion of the light-shielding leader so as not to shift, and then heating the light-shielding leader to shrink the light-shielding leader in the winding direction. The method of connecting the photosensitive material to the light-shielding reader and the method of fixing the end portion of the light-shielding leader are not limited, and examples thereof include a method using an adhesive tape or ultrasonic fusion. When fixing the end portion of the light-shielding leader by ultrasonic fusion, it is preferable to perform the transverse vibration mode in order to reduce physical impact on the light-shielding leader and the photosensitive material. Heating temperature of shading reader is 80 ~ 1
Preferably it is 20 ° C. There is no limitation on the method of heating the light-shielding reader. For example, hot air may be blown to the portion of the light-shielding reader that covers the light-shielding flange, or the rolled photosensitive material may be placed in the heater for a certain period of time.

The shape of the light-shielding flange used in the package of the present invention is not particularly limited, but is disclosed in Japanese Patent Application No. 10-15239.
It is preferable that the core portion of the light-shielding flange as described in Japanese Patent Application No. 10-269511 is a light-shielding flange whose diameter can be adjusted while being inserted into the core. The material of the light-shielding flange is preferably polystyrene, polypropylene, polyethylene, polycarbonate, polyacetal, ABS resin, or the like. In order to have a light-shielding function, it is desirable to contain carbon black from the viewpoint of light-shielding properties and cost. Carbon black can be contained by a master batch method, a compound method, or the like. The content of the carbon black varies depending on the thickness of the flange portion of the light-shielding flange. For example, the thickness of the flange portion is 1 mm.
In this case, it is 1 to 15% by weight, preferably 2 to 10% by weight, more preferably 3 to 7% by weight. The thickness of the flange portion of the light-shielding flange is 0.7 to 4 mm, preferably 1 to 3.5 m, from the viewpoint of the light-shielding function, molding dimensions, and stability of molding conditions.
m, more preferably 1.5 to 3 mm. Such a light-shielding flange can be manufactured by injection molding, blow molding, or the like.

[0033]

【Example】

[Example 1] (Production of a light-shielding long sheet) A linear low-density polyethylene resin (L-LDPE), an amorphous cyclic olefin copolymer (COC), and carbon black (CB) were each listed in Table 1 below. Were mixed at the ratios shown in Table 1, and five kinds of long light-shielding sheets (No. 1 to No. 5) were produced by inflation while changing the take-up speed and blow ratio. The thickness of each manufactured light-shielding sheet is 100 μm.
Met. In addition, L-LDPE is a product name: Ultzex UZ2021L, manufactured by Mitsui Chemicals, Inc., and COC is
Trade name: Apel 8008T, manufactured by Mitsui Chemicals, Inc.
The CB used was a mixture of DFD-011 (trade name), manufactured by Nippon Yunika Co., Ltd. at 60% by weight, and brand name: Furnace H44, manufactured by Mitsubishi Chemical Corporation, at 40% by weight.

[0034]

Table 1 L-LDPE COC CB (% by weight) (% by weight) (% ％ No. 187 10 3 No. 277 20 3 No. 3 67 30 3 No. 4 27 703 No. 5 17 80 3 ──────────────────────────────

(Measurement of Shrinkage Ratio) 1 to No. 5
Of the light-shielding long sheet in the range of 80 to 120 ° C. in the length direction and the width direction were measured by a method specified in JIS Z1709. The shrinkage below 100 ° C was measured by immersion in water, and the shrinkage above 100 ° C was measured by immersion in silicone oil. As a result, the shrinkage in the width direction was less than 2% at all temperatures in all the light-shielding long sheets. FIG. 13 shows the contraction ratio in the length direction. In the figure,-◇-indicates No. 1; 2,-×-is N
o. No. 3 and-□-are No. No. 4 and-○-indicate No. 4. 5 is represented.

As shown in FIG. 13, all of the light-shielding long sheets manufactured in Example 1 had a contraction ratio in the longitudinal direction when heated to 120 ° C. of 9% or more. Therefore, when the light-shielding long sheet manufactured in Example 1 was cut into the above-described shape and used as a light-shielding leader of a roll-shaped photosensitive material package, both ends of the light-shielding leader and the light-shielding flanges due to heat shrinkage. Can be brought into close contact with the outer side surface.

[Example 2] (Production of light-shielding long sheet) Carbon black was applied to both surfaces of a long heat-shrinkable sheet (Randy Five VP-B50, manufactured by Okura Industry Co., Ltd.) having a thickness of 50 µm. A long light-shielding sheet made of L-LDPE (UZ-2021L, manufactured by Mitsui Chemicals, Inc.) with a thickness of 35 μm mixed with 3% by weight is laminated to produce a long light-shielding sheet having a laminated structure shown in FIG. did. Table 2 shows the shrinkage ratio of the obtained light-shielding long sheet.
Shown in

[0038]

[Table 2] Table 2 ９０ 90 ℃ 100 ℃ 110 ℃ ───────────── ──────────── Length direction 5% 9% 18% Width direction 1% 1% 2% ───────────────────── ────

[0039]

The light-shielding long sheet of the present invention shrinks in the length direction and hardly shrinks in the width direction. Therefore, when it is used as a light-shielding reader for a roll-shaped photosensitive material package, its heat shrinkage. As a result, both ends of the light-shielding leader and the outer surface of the light-shielding flange can be brought into close contact with each other. Furthermore, a long light-shielding sheet containing an amorphous polyolefin-based resin has a high gas barrier property. Therefore, when used as a light-shielding reader for a roll-shaped photosensitive material package, sufficient moisture-proofing can be achieved even if it is wrapped once. Sex can be obtained. Further, in the roll-shaped photosensitive material package of the present invention, since there are few portions where both ends of the light-shielding leader are not in close contact with the outer surface of the light-shielding flange, cracks are generated at both ends of the light-shielding leader, It becomes difficult to come off from the light shielding flange. In particular, even when the tape that stops the end portion of the light-shielding leader at the end of winding is peeled off due to an impact during transportation, the light-shielding leader does not easily come off the light-shielding flange. Further, the roll-shaped photosensitive material package of the present invention has an effect that the light-shielding flange hardly comes off the core. Further, the roll-shaped photosensitive material package of the present invention is such that light does not easily enter the photosensitive material even if the photosensitive material is wound thicker than the diameter of the flange portion of the light-shielding flange, so that the flange portion of the light-shielding flange is reduced, or More photosensitive material can be wound around the core than before.

[Brief description of the drawings]

FIG. 1 is a perspective view of an example of a roll-shaped photosensitive material package of the present invention.

FIG. 2 is a cross-sectional view of an example of the vicinity of a light-shielding flange of the roll-shaped photosensitive material package of the present invention.

FIG. 3 is a cross-sectional view of another example near the light-shielding flange of the roll-shaped photosensitive material package of the present invention.

FIG. 4 is a cross-sectional view of another example near the light-shielding flange of the roll-shaped photosensitive material package of the present invention.

FIG. 5 is a cross-sectional view of another example near the light-shielding flange of the roll-shaped photosensitive material package of the present invention.

FIG. 6 is a cross-sectional view of an example of the vicinity of a light-shielding flange of a roll-shaped photosensitive material package of the present invention in which a light-shielding leader is wound around two turns;

FIG. 7 is a cross-sectional view of another example of the vicinity of the light-shielding flange of the roll-shaped photosensitive material package of the present invention in which the light-shielding leader is wound twice.

FIG. 8 is a cross-sectional view of another example of the vicinity of the light-shielding flange of the roll-shaped photosensitive material package of the present invention in which the light-shielding leader is wound twice.

FIG. 9 is a cross-sectional view of another example of the vicinity of the light-shielding flange of the roll-shaped photosensitive material package of the present invention in which the light-shielding leader is wound twice.

FIG. 10 is a front view of an example of a light-shielding reader used in the roll-shaped photosensitive material package of the present invention shown in FIGS. 6 to 8;

FIG. 11 is a front view of another example of the light-shielding reader used for the roll-shaped photosensitive material package of the present invention shown in FIGS. 6 to 8;

12 is a front view of an example of a light-shielding reader used in the roll-shaped photosensitive material package of the present invention shown in FIG.

FIG. 13 is a diagram showing a contraction rate in a length direction with respect to a temperature of the light-shielding long sheet manufactured in Example 1.

FIG. 14 is a cross-sectional view of an example of the light-shielding long sheet of the present invention having a laminated structure.

[Description of Signs] 1, 1a, 1b, 1c, 1d, 1e, 1f, 1g Rolled photosensitive material package 2, 2a, 2b Light shielding flange 3 Core 4 Light shielding leader 5 Adhesive tape 6 Photosensitive material 7 Inner leader 8 Outer leader part 9 Terminal part 10 Photosensitive material connection part 11 Taper part 12 Heat-shrinkable plastic film 13 Light-shielding plastic film

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Yasuhiko Kitamura 210 Nakanakanuma, Minamiashigara-shi, Kanagawa Prefecture Fuji Photo Film F-term (reference) 3E086 AA01 AB01 AC34 AD28 BA02 BA04 BA15 BB22 BB67 BB90 CA40

Claims (6)

[Claims] 1. The thickness is 30 to 200 μm and JIS
The shrinkage ratio specified in Z 1709 is 60 to 140 ° C.
Characterized by having a temperature in the range of 5 to 30% in the length direction and less than 5% in the width direction. 2. The light-shielding long plastic sheet according to claim 1, wherein the ratio of the shrinkage ratio in the length direction to the width direction is 3 or more. 3. The resin composition according to claim 1, comprising a colorant and a resin material, wherein 5 to 90% by weight of the resin material is an amorphous polyolefin resin. The light-shielding long plastic sheet according to 1. 4. The long light-shielding plastic sheet according to claim 1, wherein a light-shielding film is disposed on at least one surface of the heat-shrinkable plastic film. 5. The long light-shielding plastic sheet according to claim 4, wherein light-shielding films are disposed on both side surfaces. 6. A roll-shaped photosensitive material in which a long photosensitive material is wound around a core having light-shielding flanges attached to both ends, the width of which is larger than the distance between the outer surfaces of the light-shielding flanges attached to both ends, and the thickness of the roll-shaped photosensitive material. Is 30 to 200 μm and J
The shrinkage rate specified in IS Z 1709 is 60 to 14
At least one turn of a light-shielding plastic sheet having a temperature of 5 to 30% in the winding direction and less than 5% in the width direction within a range of 0 ° C., and heat shrinkage of the light-shielding plastic sheet causes the flanges at both ends. Characterized in that both ends of a light-shielding plastic sheet are brought into close contact with the outer surface of the photosensitive material.