JP3975118B2 - Light-shielding photosensitive material roll - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a light-shielding photosensitive material roll loaded in a bright room on a plate making machine using a photosensitive material.
[0002]
[Prior art]
In a plate making machine using a photosensitive material, a long photosensitive material sheet is loaded in a roll state wound around a core. Usually, the photosensitive material roll is covered with a light-shielding reader on the side surface of the ring-shaped light-shielding sheet so that it can be loaded into the plate making machine in a bright room (hereinafter, the photosensitive material roll covered with the light-shielding member is Light-shielding photosensitive material roll).
[0003]
In the light-sensitive photosensitive material roll, the ring-shaped light-shielding sheet is generally fixed to the side surface of the photosensitive material roll so as to be sandwiched between the end face of the core and a cylindrical flange with a light-shielding flange inserted into the opening of the core. (See Japanese Patent Laid-Open No. 2000-181018).
[0004]
Various photosensitive material roll drive shafts of plate making machines have been developed and put to practical use. A typical example is a rod-shaped drive shaft having the same outer diameter as the inner diameter of the core, and an outer diameter movable that expands the outer diameter of the drive shaft tip to the same diameter as the inner diameter of the core after being inserted into the core. There is a mold drive shaft.
[0005]
In the light-shielding photosensitive material roll in which the ring-shaped light-shielding sheet is fixed by a cylinder with a light-shielding flange, the cylindrical portion of the cylinder with the light-shielding flange inserted into the core is in contact with the drive shaft. Therefore, in the conventional cylinder with a light-shielding flange, the length of the cylindrical portion needs to be the length from the opening of the core to the extended portion of the outer diameter movable drive shaft.
[0006]
[Problems to be solved by the invention]
In general, a cylinder with a light-shielding flange used for a light-shielding photosensitive material roll has an outer diameter of the cylinder that is substantially the same as an inner diameter of the core so as to firmly contact the inner wall of the core. Accordingly, if the length of the cylindrical portion of the cylinder with the light shielding flange is excessively long, it becomes difficult to insert the cylinder with the light shielding flange into the core of the photosensitive material roll.
[0007]
An object of the present invention is to provide a light-shielding photosensitive material roll that can be stably supported by various drive shafts while the length of the cylinder with a light-shielding flange is industrially easily inserted into the core of the photosensitive material roll. It is to provide.
[0008]
[Means for Solving the Problems]
The present invention provides a photosensitive material roll formed by winding a long photosensitive material sheet around a hollow core, and a radius substantially the same as the radius of the photosensitive material roll attached to each end of the core. A pair of ring-shaped side light-shielding sheets having a light-shielding reader that is bonded to the front end of the elongated photosensitive material sheet and that is arranged so that both end portions cover the entire outer periphery of each ring-shaped side light-shielding sheet; Furthermore, a light-sensitive photosensitive material roll having a pair of light-shielding flanged cylinders inserted into each opening on both sides of the winding core, the tip of each cylinder of the pair of flanged cylinders being extended to a position inside wall surface of the winding core corresponding contact two or more spacer spacer sheet formed from a sheet unit having a thickness and substantially the same thickness of the cylinder is an extension of the chucking flange of the outer-diameter-acting drive shaft It is in the light-blocking photosensitive material roll, characterized in that the position is bonded and fixed to that.
[0009]
In the light-shielding photosensitive material roll of the present invention, each of the two or more spacer sheet units may be bonded and fixed to the inner wall surface of the core at a symmetrical position with respect to the center line of the core. Further, it is preferable that each of the two or more spacer sheet units has the same shape.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The construction of the light-shielding photosensitive material roll of the present invention and its main constituent members will be described with reference to the accompanying drawings.
[0011]
FIG. 1 is a perspective view of an example of the light-shielding photosensitive material roll of the present invention. The photosensitive material roll is shielded from light by a pair of ring-shaped side light-shielding sheets 1 attached to the core of the photosensitive material roll, and a light-shielding reader 2 arranged so that both end portions cover the entire outer periphery of each ring-shaped side light-shielding sheet. ing. The ring-shaped side light-shielding sheet 1 is sandwiched and fixed between the end face of the winding core and the flange portion 7 of the cylinder 6 with the light-shielding flange inserted into the opening of the winding core of the photosensitive material roll. The end of the light-shielding reader 2 wound around the photosensitive material roll is stopped by an adhesive tape 5.
[0012]
FIG. 2 is a partial cross-sectional view of an example of the light-shielding photosensitive material roll of the present invention. In the light-shielding photosensitive material roll of the present invention, the inner wall surface of the core 12 of the photosensitive material roll 11 corresponding to the position where the tip of the cylindrical portion 8 of the cylinder 6 with flange is extended is substantially the same as the thickness of the cylindrical portion 8. A spacer sheet 9 having a thickness is bonded and fixed.
The drive shaft 20 is an outer diameter movable drive shaft, and the extended portion 27 of the chucking flange 24 is in contact with the spacer sheet 9. The thickness of the spacer sheet 9 is preferably in the range of −0.2 to +0.3 mm with respect to the thickness of the cylindrical portion 8 of the flanged cylinder 6. For example, if the thickness of the cylindrical portion 8 of the flanged cylinder 6 is 0.5 mm, the spacer sheet 9 is preferably 0.3 to 0.8 mm thick.
[0013]
The spacer sheet 9 may be formed from a single sheet having a width (length in the circumferential direction of the core) of ½ or more of the inner circumference of the core 12. In order to facilitate alignment, the spacer sheet is preferably formed from two or more spacer sheet units.
[0014]
FIG. 3 is a cross-sectional view of an example of a core in which a spacer sheet is formed from two spacer sheet units. The spacer sheet 9 is formed of two spacer sheet units 10 each having the same shape. The spacer sheet unit 10 bonded and fixed to the core 12 is bonded and fixed to the inner surface of the core at a position symmetrical to the center line of the core 12. The width of the spacer sheet unit 10 (the length in the circumferential direction of the core) is usually a length corresponding to a range of ¼ to ３ of the inner circumference of the core 12. Although there is no restriction | limiting in particular in the length (length in the length direction of a core) of the spacer sheet unit 10, Usually, it is the range of 5-15 cm.
[0015]
As the spacer sheet 9, various plate-like materials such as a paper plate, a plastic plate formed from a resin such as polystyrene, and a metal plate formed from a metal such as aluminum are used as long as they can be bonded and fixed to the inner wall surface of the core 12. be able to. It is preferable that the plate-like material used for the spacer sheet 9 be bent along the inner periphery of the core by adding a crease line or a half cut extending in the length direction on the surface thereof, or bent by a calendar process.
The spacer sheet is not limited to a plate-like material, and for example, a cylindrical material such as a paper tube, a plastic tube, or a metal tube can be used.
[0016]
As a means for adhering and fixing the spacer sheet to the core, any means using an adhesive, an adhesive tape, and various adhesives such as a hot melt adhesive and a water-soluble adhesive can be applied.
[0017]
4 is an exploded perspective view of the outer diameter movable drive shaft of FIG. The outer diameter movable drive shaft includes a tapered cone 21, a chucking flange 24, and a chuck handle 30. The taper cone 21 is a tapered cylindrical body having a protrusion 22 on the outer surface and an outer diameter of one opening having a thread 23 on the inner surface larger than the outer diameter of the other opening. is there. The chucking flange 24 includes a cylindrical boss portion 25 and a flange portion 29 having an inner diameter larger than the outer diameter of one opening of the tapered cone 21 and smaller than the outer diameter of the other opening. The boss portion 25 is provided with a cut 26 extending in the length direction at the tip thereof, and an extended portion 27 is formed by the cut 26. Six convex portions 28 are provided at equal intervals on the flange portion 29 side of the boss portion 25. The convex portion 28 serves to fix the chucking flange 24 so as not to idle in the core of the photosensitive material roll. The chuck handle 30 includes a cylindrical protrusion 32 provided with a screw portion 31 that responds to the screw thread 23 of the tapered cone 21 at the tip, and a disc-like handle portion 33.
The tapered cone 21 is inserted into the boss portion 25 by engaging the protrusion 22 with the notch 26 of the chucking flange 24. When the thread 23 of the taper cone 21 and the threaded portion 31 of the chucking handle 30 are fitted together and the handle portion 33 is rotated, the taper cone 21 and the chuck handle 30 are tightened so that the taper cone 21 becomes the boss portion 25. It penetrates into the inside and pushes the extended portion 27 of the boss portion 25 apart. Such an outer diameter movable drive shaft is used in, for example, a plate making machine (trade name: SelectSet7000, Avantra series) sold by Agfa Kebalt Co., Ltd.
[0018]
FIG. 5 is an exploded perspective view of an example of the light-shielding photosensitive material roll of the present invention. The photosensitive material roll 11 is formed by winding a long photosensitive material sheet 13 around a core 12.
Examples of the photosensitive material sheet 13 include a photosensitive material for printing (photosensitive material film or paper for photoengraving or photosetting) and a photosensitive material for photographic paper (color paper or black-and-white photographic paper). Specific examples of photosensitive materials for printing include camera film, contact film, stripping film, duplicating film, laser film, camera paper, contact paper, stripping paper, duplicating paper, laser paper, and dry facsimile. A film, a squirrel film, and a gravure film can be mentioned. Specific examples of photosensitive materials for photographic paper include color paper, color laser paper, reverse color paper, chrome paper, contact printing paper, stretching printing paper, stretching multi-tone printing paper, special paper There may be mentioned photographic paper.
[0019]
The thickness of the core 12 is usually in the range of 1 to 5 mm. As the winding core 12, a paper tube is usually used, but a plastic tube formed from a resin such as polystyrene or a metal tube formed from a metal such as aluminum can be used. A buffer sheet (cushion sheet) such as polyethylene laminated paper or a foamed urethane sheet may be wound around the outer surface of the core 12 so that the photosensitive material sheet in contact with the core does not leave a trace of the core.
[0020]
The radius of the ring-shaped side light shielding sheet 1 is substantially the same as the radius of the photosensitive material roll 11, and is usually the same as or slightly smaller than the radius of the photosensitive material roll. The circular hole 14 provided in the center of the ring-shaped side light shielding sheet 1 has a diameter larger than the inner diameter of the core 12 and smaller than the outer diameter. The thickness of the ring-shaped side light-shielding sheet 1 is usually in the range of 0.1 to 0.5 mm. The rigidity of the ring-shaped side-surface light-shielding sheet 1 is in the range of 30 to 150 [(cm) ³ ] in a value measured according to the Clark method defined in JIS-P-8143 (a stiffness test method using a paper weight bending method). It is preferable to be within.
[0021]
Examples of the material for the ring-shaped side light-shielding sheet 1 include polyethylene, polyethylene terephthalate, polycarbonate, polystyrene (particularly, impact-resistant polystyrene), polyester in which a light-shielding powder such as carbon black is dispersed within a range of 1 to 10% by weight. A resin such as polypropylene can be used.
[0022]
The ring-shaped side light shielding sheet 1 may be a single layer sheet formed from the above resin material, but is preferably a laminated sheet in which two or more films formed from the above resin material are stacked. As an example of a laminated sheet for a ring-shaped side light-shielding sheet, three layers of polyethylene film (thickness: 20 to 40 μm) / polyethylene terephthalate film (thickness: 25 to 100 μm) / polyethylene film (thickness: 20 to 40 μm) The laminated sheet of a structure can be mentioned. Further, when the ring-shaped side light shielding sheet and the flanged cylindrical flange are heat-sealed, a laminated sheet having a low-temperature heat-sealable film (eg, ethylene-vinyl acetate copolymer film) on one surface is prepared. It can also be used. As a specific example of a laminated sheet having a low-temperature heat-sealable film, a laminated sheet having a four-layer structure in which an ethylene-vinyl acetate copolymer film is bonded to one surface of the laminated sheet having the three-layer structure, or A three-layer laminated sheet in which one polyethylene film of the three-layer laminated sheet is replaced with an ethylene-vinyl acetate copolymer film can be exemplified. In a ring-shaped side light shielding sheet having a low-temperature heat-sealable film on one surface, for example, the low-temperature heat-sealable film surface is black so that the low-temperature heat-sealable film surface and the other surface can be visually discriminated. It is preferable to color each other, for example, to make the other surface gray.
Various laminating methods (eg, dry laminating method) can be employed for bonding the films.
[0023]
The flanged cylinder 6 includes a flange portion 7 and a cylindrical portion 8. The cylindrical portion 8 is inserted into the core 12, and the ring-shaped side light shielding sheet 1 is fixed between the flange portion 7 and the end surface of the core 12. It is preferable that the outer diameter of the cylindrical portion 8 is substantially the same as the inner diameter of the core 12 so that it can be firmly fixed to the core, in particular, slightly larger.
In general, a convex portion is provided on the outer surface of the drive shaft of the plate making machine, and the drive shaft is prevented from spinning in the core of the photosensitive material roll by bringing the inner wall of the core into contact with the convex portion. (See FIG. 4). In this invention, the convex part provided in the drive shaft contacts the inner wall of the cylindrical part 8 of the flanged cylinder 6. For this reason, it is preferable that a groove is provided on the inner wall of the cylindrical portion 8 at a position corresponding to the convex portion of the drive shaft.
[0024]
FIG. 6 is a perspective view showing an example of a flanged cylinder that can be suitably used for the light-shielding photosensitive material roll of the present invention. FIG. 7 is a perspective view of the light-shielding photosensitive material roll using the flanged cylinder of FIG. It is a fragmentary sectional view. The cylindrical portion 8 of the flanged cylinder 6 is provided with a plurality of drive shaft fixing groove portions 15 for engaging convex portions provided on the drive shaft of the optical material roll so that the drive shaft does not idle. Yes.
[0025]
The outer diameter of the cylindrical portion 8 of the flanged cylinder 6 is preferably 100.1 to 103% of the inner diameter of the core, and a cylindrical recessed portion is formed on the outer surface of the cylindrical portion 8 on the flange portion 7 side. 16 is preferably provided. By making the outer diameter of the cylindrical portion 8 of the flanged cylinder 6 larger than the inner diameter of the winding core and providing the cylindrical recess 16, the cylindrical portion 8 inserted into the winding core 12 is a cylinder as shown in FIG. 4. Curved inward at the concave and convex portion 16. And the protrusion 17 of the cylinder recessed part 16 contacts the inner wall of the core 12 strongly, and the engagement property of the cylinder 6 with a flange and the core 12 becomes high. The length of the cylindrical portion 8 is usually in the range of 2 to 5 cm.
[0026]
As the material of the flanged cylinder 6, a resin such as polycarbonate, polystyrene (particularly, impact-resistant polystyrene), polyester, or polypropylene in which a light-shielding powder such as carbon black is dispersed within a range of 1 to 10% by weight is used. be able to.
[0027]
The light shielding reader 2 is usually wound around the photosensitive material roll after the ring-shaped side light shielding sheet 1 is attached to the winding core 12. The length of the light-shielding reader 2 is equal to or longer than the outer periphery of the ring-shaped side light-shielding sheet, and is usually two to three times as long as the outer periphery of the ring-shaped side light-shielding sheet. The width of the light-shielding reader 2 is made wider than the width of the photosensitive material roll so that both ends thereof are in contact with the outer surface of the ring-shaped side light-shielding sheet.
[0028]
As a method for bringing both end portions of the light-shielding reader 2 into contact with the outer surface of the ring-shaped side-surface light-shielding sheet 1, it is preferable to use a heat-shrinkable light-shielding sheet for the light-shielding reader and a method for heat-shrinking the heat-shrinkable light-shielding sheet. When a heat-shrinkable light-shielding sheet is used for the light-shielding reader, the entire light-shielding reader may be used as a heat-shrinkable light-shielding sheet, but the heat-shrinkable light-shielding sheet should be used only for the portion that contacts the outer surface of the ring-shaped side light-shielding sheet. However, it is preferable in terms of material cost.
The light-shielding reader 2 shown in FIG. 5 has a configuration in which the heat-shrinkable light-shielding sheet 4 is attached to both end portions of the light-shielding sheet 3 having the same width as the photosensitive material sheet and little or no heat-shrinkability.
[0029]
As the material of the light shielding sheet 3, a resin such as low density polyethylene and polyethylene terephthalate mixed with a light shielding pigment such as carbon black can be used. The light shielding sheet may be a single layer sheet formed from the above resin material, but is preferably a laminated sheet in which two or more films formed from the above resin material are stacked. As an example of the laminated sheet for the light shielding sheet, a laminated sheet having a three-layer structure of polyethylene film / polyethylene terephthalate film / polyethylene film can be mentioned. The polyethylene film preferably has a thickness in the range of 20 to 100 μm, and the polyethylene terephthalate film preferably has a thickness in the range of 25 to 175 μm. Various laminating methods (for example, dry laminating methods) can be employed for bonding the films.
[0030]
The heat-shrinkable light-shielding sheet 4 preferably has a heat shrinkage rate in the length direction that is relatively larger than a heat shrinkage rate in the width direction. For example, the heat shrinkage rate in the length direction of the heat-shrinkable light-shielding film at 100 ° C. is 5% or more, preferably 15% or more, and an absolute difference from the shrinkage rate in the width direction is 1% or more, preferably Is preferably 3%, more preferably 5% or more. In addition, the heat shrink rate of said heat-shrinkable light-shielding film is the value measured according to the method prescribed | regulated to JIS-Z-1709-1976 (shrink packaging film).
[0031]
The heat-shrinkable light-shielding sheet 4 is preferably tearable in the length direction, and the Elmendorf tear load in the length direction is more preferably in the range of 0.1 to 0.5N. When the Elmendorf tear load in the length direction is larger than 0.5 N, the heat-shrinkable light-shielding sheet tends to be difficult to tear. When the Elmendorf tear load is smaller than 0.1 N, the light-shielding photosensitive material roll is transported. The heat-shrinkable light-shielding film tends to tear easily. The Elmendorf tear load of the above heat-shrinkable light-shielding film is in accordance with the method specified in JIS-K-7128-2: 1998 (Plastic Film and Sheet Tear Strength Test Method—Part 2). It is a measured value.
[0032]
The heat-shrinkable light-shielding sheet 4 includes a transparent or translucent shrink film that has a large heat-shrinkability in the length direction and can be torn in the length direction, and a light-shielding film that exhibits little or no heat shrinkability. Can be used. In particular, a laminated sheet having a three-layer structure of light shielding film / shrink film / light shielding film is preferable. The light-shielding film and the shrink film preferably each have a thickness in the range of 10 to 30 μm. As the shrink film, for example, THS, TNS, TAS, TBS, and TRS can be used as the grade of fancy wrap (trade name, manufactured by Gunze Co., Ltd.). As the light shielding film, for example, a film such as a low density polyethylene film mixed with a pigment such as carbon black can be used.
[0033]
【The invention's effect】
In the light-shielding photosensitive material roll of the present invention, the length of the cylindrical portion of the light-shielding flanged cylinder is shorter than that of the conventional one. Therefore, the light-shielding flanged cylinder can be inserted into the core of the photosensitive material roll relatively easily. Can do.
[Brief description of the drawings]
FIG. 1 is a perspective view of an example of a light-shielding photosensitive material roll of the present invention.
FIG. 2 is a partial cross-sectional view of an example of a light-shielding photosensitive material roll of the present invention.
FIG. 3 is a cross-sectional view of an example of a core in which a spacer sheet is formed by two spacer sheet units.
4 is an exploded perspective view of the outer diameter movable drive shaft shown in FIG. 2. FIG.
FIG. 5 is an exploded perspective view of an example of the light-shielding photosensitive material roll of the present invention.
FIG. 6 is a perspective view showing an example of a flanged cylinder that can be suitably used for the light-shielding photosensitive material roll of the present invention.
7 is a partial cross-sectional view of a light-shielding photosensitive material roll using the flanged cylinder of FIG. 6;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ring-shaped side surface light-shielding sheet 2 Light-shielding reader 3 Light-shielding sheet 4 Heat-shrinkable light-shielding sheet 5 Adhesive tape 6 Flange cylinder 7 Flange part 8 Cylindrical part 9 Spacer sheet 10 Spacer sheet unit 11 Photosensitive material roll 12 Core 13 Photosensitive material sheet 14 Circular hole 15 Drive shaft fixing groove portion 16 Tube portion recessed portion 17 Protrusion 20 Drive shaft 21 Tapered cone 22 Protrusion 23 Screw thread 24 Chucking flange 25 Boss portion 26 Notch 27 Expansion portion 28 Protruding portion 29 Flange portion 30 Chuck handle 31 Screw portion 32 Cylindrical protrusion 33 Handle part

Claims (3)

A photosensitive material roll formed by winding a long photosensitive material sheet around a hollow core, and a pair of rings attached to both ends of the core and having a radius substantially the same as the radius of the photosensitive material roll A side light shielding sheet, a light shielding reader which is bonded to the leading end of the long photosensitive material sheet and whose both end portions cover the entire outer periphery of each ring side light shielding sheet. A light-shielding photosensitive material roll having a pair of light-shielding flanged cylinders inserted into each of the opening portions on both sides of the pair of the flanged cylinders, wherein the winding corresponds to a position where the front ends of the cylinders are extended. inside wall surface of the core, to a position where two or more spacers spacer sheet formed from a sheet unit having substantially the same thickness as the cylindrical contacts the extended portion of the chucking flange of the outer-diameter-acting drive shaft Light-blocking photosensitive material roll which is characterized in that it is wearing fixed.   2. The light-shielding photosensitive material roll according to claim 1, wherein each spacer sheet unit is adhesively fixed to the inner wall surface of the core at a position symmetrical to the center line of the core. 2. The light-shielding photosensitive material roll according to claim 1 , wherein each of the two or more spacer sheet units has the same shape.

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