JP2003248287A - Light shielding structure of light shieldable photosensitive material roll - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light shielding structure of a light shieldable photosensitive material roll which can maintain light shieldability even when the structure receives vibrations and the impact of falling. <P>SOLUTION: The light shielding structure of the light shieldable photosensitive material roll has a photosensitive material roll formed by winding a photosensitive material sheet around a hollow winding core, a pair of light shielding flanges fitted into the hollow section of the photosensitive material roll to shield both flanks in the axial direction of the photosensitive material roll and buffer members fitted into portions of the light shielding flanges to relieve the impact received by the photosensitive material roll, in which annular members are disposed between the light shielding flanges and the buffer members. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-shielding structure for a light-shielding photosensitive material roll, and more particularly to a light-shielding structure for a light-shielding photosensitive material roll that is strong against shock such as vibration or dropping.

[0002]

2. Description of the Related Art A plate-making machine using a light-sensitive material is loaded with a long sheet of light-sensitive material in the form of a roll wound around a winding core. Usually, the photosensitive material roll is covered with a light shielding member so that it can be loaded into the apparatus in a bright room (hereinafter, the photosensitive material roll covered with the light shielding member is referred to as a light shielding photosensitive material roll).

A light-shielding leader having a width wider than that of the light-sensitive material sheet is fitted to the winding core of the light-sensitive material roll by fitting a light-shielding flange whose central portion is formed with a light-shielding flange. There is known a structure in which a photosensitive material sheet is wrapped around the photosensitive material sheet so that both end portions contact the inner surface of the light-shielding flange.

During the packaging of such a light-shielding photosensitive material roll, the light-shielding material roll is stored in a cardboard box or the like with a cushioning member fitted to the cylindrical portion of the light-shielding flange. However, according to this configuration, both sides of the photosensitive material roll (light-shielding flange)
If there is a gap between the shock absorber and the cushioning member and it receives a shock due to vibration or drop during transportation, the light shielding flange will detach from the winding core, but a gap will be created between the light shielding reader and the light shielding flange. , Light may enter through the gap.

A conventional configuration will be specifically described with reference to the drawings. FIG. 9A is a cross-sectional view showing a state in which the light-shielding photosensitive material roll 10 is fitted with the cushioning flange 20, the cushioning flange 20 is further fitted with the cushioning member 21, and the spacer 23 is housed in the cardboard box 24. It is a figure. When the light-shielding photosensitive material roll 10 receives an impact by being dropped or the like, as shown in FIG. 9B, the winding core 2 of the light-shielding photosensitive material roll 10 is separated from the light-shielding flange 20 by an amount corresponding to the deformation angle θ. , A gap δ is generated, and light enters through the gap δ.

In order to avoid such a problem, as shown in FIG. 10, by providing a projection 20b on the cylindrical portion of the light-shielding flange 20, the light-shielding photosensitive material roll 10 and the light-shielding flange 20 are firmly fitted together. , It has been proposed to prevent detachment. However, according to this structure, the winding core 2 may rise due to the protrusion 20b and press the photosensitive material to cause pressure fog. Further, as shown in FIG. 11, it is proposed that the light-shielding photosensitive material roll 10 and the light-shielding flange 20 are firmly fitted to each other by providing a protrusion 20c extending in the longitudinal direction of the winding core 2 to prevent detachment. Has been done. However, according to this configuration, the winding core 2 is deformed by the protrusion 20c, the fitting force between the light shielding flange 20 and the winding core 2 is weakened, and the core 2 is easily detached.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the various problems in the prior art and achieve the following objects. That is, an object of the present invention is to provide a light-shielding structure for a light-shielding photosensitive material roll, which can maintain the light-shielding property even when it receives an impact such as vibration or drop.

[0008]

Means for solving the above problems are as follows. That is, a photosensitive material roll formed by winding a photosensitive material sheet around a hollow core, and a pair of light-shielding flanges that are fitted in the hollow portion of the photosensitive material roll and shield both axial side surfaces of the photosensitive material roll from light. A light-shielding structure of a light-shielding photosensitive material roll, comprising: a cushioning member that fits into a part of the light-shielding flange and cushions a shock received by the photosensitive material roll, wherein the light-shielding photosensitive material roll is provided between the light-shielding flange and the cushioning member. The light-shielding structure of the light-shielding photosensitive material roll is characterized in that a ring-shaped member is provided.

According to another aspect of the present invention, there is provided a photosensitive material roll obtained by winding a photosensitive material sheet around a hollow core.
A pair of light-shielding flanges that are fitted in the hollow portion of the photosensitive material roll and shield both side surfaces in the axial direction of the photosensitive material roll, and are fitted in a part of the light-shielding flanges to reduce the impact received by the photosensitive material roll. A light-shielding photosensitive material roll structure comprising: a buffer member, wherein a ring-shaped convex portion is integrally formed on the buffer member side of the light-shielding flange. Is.

In any of the above-described light-shielding structures of the light-shielding photosensitive material roll of the present invention, even if a moment such that the photosensitive material roll is disengaged from the cushioning member is generated due to an impact caused by dropping, the light-shielding flange is The light-sensitive material roll is kept in contact with the light-shielding leader so that no light enters through the gap.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The light-shielding structure of a light-shielding photosensitive material roll of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a light-shielding photosensitive material roll according to the first embodiment of the present invention, and FIG. 2 is an exploded perspective view of the light-shielding photosensitive material roll.

The light-shielding photosensitive material roll 10 is shown in FIGS.
As shown in FIG. 1, a long photosensitive material sheet 3 is attached to a hollow core 2
The light-sensitive material roll 1 wound around the periphery of the photosensitive material roll 1, a light-shielding flange 20 including a tubular portion fitted to each end of the photosensitive material roll 1 and a flange portion, and joined to the leading end portion of the long-sized photosensitive material sheet 3. From the light-shielding leader 4 having a length longer than the circumference of the light-shielding flange 20 and a width wider than the width of the elongated photosensitive material sheet 3, and the adhesive tape 5 attached to the tip of the light-shielding leader 4. Become.

In the light-shielding photosensitive material roll shown in FIG.
The light-shielding leader 4 has a length longer than the outer circumference of the flange portion of the light-shielding flange 20, preferably shorter than twice the outer circumference of the flange portion, and has a width substantially equal to the width of the elongated photosensitive material sheet 3. The sheet 4a includes a heat-shrinkable light-shielding film 4b having a length longer than the outer circumference of the flange portion of the light-shielding flange 20 and shorter than the light-shielding sheet 4a. In the light-shielding reader having such a configuration, the heat-shrinkable light-shielding film 4 is used.
It is preferable that b is attached to the surface of the light-shielding sheet 4a that is not in contact with the photosensitive material roll.

The light-shielding sheet 4a preferably has little or no heat-shrinkability, and a known light-shielding leader for light-shielding photosensitive material rolls can be used. Specific examples of the light shielding sheet include a light shielding plastic sheet such as a low density polyethylene sheet mixed with a pigment such as carbon black.

The heat-shrinkable light-shielding film 4b preferably has a heat shrinkage ratio in the length direction of the film relatively higher than that in the width direction. For example, the heat shrinkage ratio in the length direction of the heat shrinkable light-shielding film at 100 ° C. is 5% or more, preferably 15% or more, and the absolute difference from the shrinkage ratio in the width direction is 1% or more, preferably 3%. %, More preferably 5% or more. The heat shrinkage ratio of the heat shrinkable light-shielding film is measured according to JIS Z 1709-1.
It is a value measured according to the method specified in 976 (shrink wrapping film).

The heat-shrinkable light-shielding film 4b is preferably tearable in the longitudinal direction, and the Elmendorf tear load in the longitudinal direction is more preferably in the range of 0.1 to 0.5N. If the Elmendorf tear load in the length direction is greater than 0.5 N, the heat-shrinkable light-shielding film may not be easily torn, and if the Elmendorf tear load is less than 0.1 N, the heat-shielding light-sensitive material roll may not be heated during transportation. The shrinkable light-shielding film may tear. The Elmendorf tear load of the heat-shrinkable light-shielding film is measured according to JIS K 71
28-2: 1998 (Plastic-Tear strength test method for film and sheet-Part 2).

As an example of the heat-shrinkable light-shielding film, a transparent or semi-transparent shrink film having a large heat-shrinkability in the longitudinal direction and capable of tearing in the longitudinal direction is a light-shielding film showing little or no heat-shrinkability. A laminated film obtained by laminating a flexible film can be used, but the present invention is not limited thereto. Examples of the shrink film that can be used for the laminated heat-shrinkable light-shielding film include those having fancy wrap (trade name, manufactured by Gunze Co., Ltd.) grades of THS, TNS, TAS, TBS, and TRS. Examples of the light-shielding film that can be used for the laminated heat-shrinkable light-shielding film include a film such as a low density polyethylene film mixed with a pigment such as carbon black.

The above light-shielding photosensitive material roll 10 is shown in FIG.
As shown in FIG.
In the fitted state, the spacers 23 are embedded in the cardboard box 24 if necessary.

FIG. 4 is a partial sectional view taken along the line IV-IV of FIG. As shown in FIG. 4A, in the present embodiment, between the light shielding flange 20 and the cushioning member 21,
The ring-shaped member 25 includes the light-shielding flange 20 and the cushioning member 2.
It is provided in a state of being in contact with 1. Even if a shock such as a drop is received by the ring-shaped member 25, as shown in FIG.
As shown in FIG. 5, a gap Δδ with respect to the deformation angle θ is generated on the buffer member 21 side of the ring-shaped member 25, and
Can maintain the state of being in contact with the side surface of the light-shielding photosensitive material roll 10, and the light-shielding property is maintained.

The material of the ring-shaped member 25 is not particularly limited as long as it does not affect the photosensitive material roll, and may be paper, resin, metal or the like, among which paper is particularly preferable. When the winding core 2 is formed of paper, the ring-shaped member 25 can be formed by simply cutting the winding core into slices.

As for the size of the ring-shaped member 25, the inner diameter is preferably the same as the inner diameter of the light-shielding flange 20, and the outer diameter is preferably equal to or less than the outer diameter of the photosensitive material roll. The outer diameter of the ring-shaped member 25 is more preferably not less than the outer diameter of the winding core and not more than ((outer diameter of the photosensitive material roll 10 + inner diameter of the light shielding flange 20) / 3). The thickness of the ring member 25 is preferably 0.5 mm or more and less than the boss length of the buffer member 21. More specifically, the ring-shaped member 25 has an inner diameter of 60 mm and an outer diameter of 8 mm.
The thickness can be 0 mm and the thickness is 1 mm.

Next, a second embodiment of the light shielding structure of the light shielding photosensitive material roll to which the present invention is applied will be described.
5 and 6 show a light shielding structure of the light shielding photosensitive material roll of the second embodiment. The light-shielding structure of the light-shielding photosensitive material roll in the second embodiment is different from the first embodiment in that the ring-shaped convex portion 20a is integrally formed on the cushioning member 21 side of the light-shielding flange 20 ′, and other than that. The configuration is substantially the same as that of the first embodiment.

In the second embodiment, as shown in FIG. 6, the light-shielding flange 20 'is composed of a hollow cylindrical portion and a flange portion, and a ring-shaped portion is provided on the surface of the flange portion opposite to the cylindrical portion. The convex portion 20a is integrally formed. FIG. 5 shows a state in which the cylindrical portion of the light shielding flange 20 'is fitted to the winding core 2 and the cushioning member 21 is further fitted to the light shielding flange 20'. As shown in FIG. 5, the ring-shaped convex portion 20a
Is in contact with the light-shielding photosensitive material roll side surface of the buffer member 21, and the ring-shaped member 25 described in the first embodiment.
Similarly to the above, the light-shielding flange 2
0, the light-shielding leader 4, and the light-shielding flange 20 do not form a gap, and the light-shielding property can be maintained. In addition,
In this embodiment, the gap is formed between the light shielding flange 20 and the cushioning member 21.

The formation position of the ring-shaped convex portion 20a is as follows.
It is preferable to be on the concentric circle of the opening (circular shape) of the tubular portion of the light-shielding flange 20 ′ and in the vicinity of the tubular portion. Further, the preferable size of the ring-shaped convex portion 20a is the same as that of the ring-shaped member 25 shown in the first embodiment.

Next, a third embodiment of the light blocking structure of the light blocking photosensitive material roll to which the present invention is applied will be described.
7 and 8 show the light shielding structure of the light shielding photosensitive material roll of the third embodiment. The light-shielding structure of the light-shielding photosensitive material roll in the third embodiment is different from the first embodiment in that the ring-shaped convex portion 21a is integrally formed on the cylindrical portion side of the cushioning member 21 ', and other than that. The configuration is substantially the same as that of the first embodiment.

In the third embodiment, the cushioning member 2
As shown in FIG. 8, 1'is integrally formed with a ring-shaped convex portion 21a on the side of the cylindrical portion that fits with the light-shielding flange 20. FIG. 7 shows a state in which the tubular portion of the light shielding flange 20 is fitted to the winding core 2 and the cushioning member 21 ′ is further fitted to the light shielding flange 20. As shown in FIG. 7, the ring-shaped convex portion 21a is in contact with the flange portion of the light-shielding flange 20, and similar to the ring-shaped member 25 described in the first embodiment, even if it receives a shock such as a drop. The light-shielding property can be maintained without forming a gap between the light-shielding flange 20, the light-shielding leader 4, and the light-shielding flange 20. In addition, in this embodiment, a gap upon impact is generated between the light shielding flange 20 and the cushioning member 21 '.

[0027]

According to the present invention, it is possible to provide a light-shielding structure for a light-shielding photosensitive material roll which can maintain its light-shielding property even when it is subjected to shock such as vibration or dropping.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a light-shielding photosensitive material roll according to the present invention.

FIG. 2 is an exploded perspective view of an example of a light-shielding photosensitive material roll according to the present invention.

FIG. 3 is a diagram showing a part of a process of packaging a light-shielding photosensitive material roll.

FIG. 4 is a partial cross-sectional view taken along the line IV-IV of FIG.

FIG. 5 is a partial cross-sectional view of a light shielding structure of a light shielding photosensitive material roll according to a second embodiment of the present invention.

FIG. 6 is a perspective view showing a light shielding flange in a second embodiment to which the present invention is applied.

FIG. 7 is a partial cross-sectional view of a light shielding structure of a light shielding photosensitive material roll according to a third embodiment of the present invention.

FIG. 8 is a perspective view showing a cushioning member according to a third embodiment of the present invention.

9 is a partial sectional view corresponding to FIG. 4, showing a light-shielding structure of a conventional light-shielding photosensitive material roll.

FIG. 10 is a partial sectional view corresponding to FIG. 4, showing a light-shielding structure of a conventional light-shielding photosensitive material roll.

FIG. 11 is a partial sectional view corresponding to FIG. 4, showing a light-shielding structure of a conventional light-shielding photosensitive material roll.

[Explanation of symbols]

1 Photosensitive material roll 2 winding core 3 Photosensitive material sheet 4 Shading reader 4a light shielding sheet 4b Heat-shrinkable light-shielding film 5 adhesive tape 10 Light-shielding photosensitive material roll 20 20 'light-shielding flange 20a Ring-shaped convex portion 21 21 'cushioning member 21a Ring-shaped convex portion 23 Spacer 24 cardboard boxes 25 Ring-shaped member

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G03C 3/00 545 G03C 3/00 545C B65D 81/30 B65D 81/30 C F term (reference) 3E067 AA16 AB99 AC01 BA06C BA20B BB01C BB25B CA12 DA02 EA01 EA05 EC33 FA04 FB08 FC01

Claims (2)

[Claims] 1. A photosensitive material roll having a hollow core around which a photosensitive material sheet is wound, and a pair of light shields fitted in the hollow portion of the photosensitive material roll to shield both axial side surfaces of the photosensitive material roll from light. A light-shielding structure for a light-shielding photosensitive material roll, comprising: a flange; and a cushioning member that fits into a portion of the light-shielding flange to reduce the impact received by the photosensitive material roll, wherein the light-shielding flange and the cushioning member are provided. A light-shielding structure for a light-shielding photosensitive material roll, characterized in that a ring-shaped member is provided between them. 2. A photosensitive material roll formed by winding a photosensitive material sheet around a hollow core, and a pair of light-shielding flanges which are fitted in the hollow portion of the photosensitive material roll and shield both side surfaces in the axial direction of the photosensitive material roll from light. A light-shielding structure of a light-shielding photosensitive material roll, comprising: a cushioning member that fits into a part of the light-shielding flange and cushions a shock received by the photosensitive material roll; A light-shielding structure for a light-shielding photosensitive material roll, wherein a ring-shaped convex portion is formed.