JP3855136B2 - Packaging method of photosensitive lithographic printing plate - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for packaging a photosensitive lithographic printing plate, and more particularly to a method for packaging a photosensitive lithographic printing plate for transporting and storing a large number of stacked photosensitive lithographic printing plates.
[0002]
[Prior art]
A photosensitive lithographic printing plate (hereinafter referred to as PS plate (Pre-Sensitized Plate)) used in a newspaper rotary press or the like has a photosensitive resin layer formed on the surface of a support made of an aluminum plate or the like. A large number of sheets (200 to 1500 sheets) are packaged in a state of being stacked on a platen, and are transported and stored in this state.
[0003]
Conventionally, as PS packaging methods, Japanese Utility Model Publication No. 62-6035 (hereinafter abbreviated as “conventional technology A”), Japanese Utility Model Publication No. 7-9156 (hereinafter abbreviated as “conventional technology B”), There are those disclosed in Kaihei 6-100064 (hereinafter abbreviated as “conventional technology C”) and Japanese Patent Laid-Open No. 5-100367 (hereinafter abbreviated as “conventional technology D”).
[0004]
In the packaging method of the prior art A, a large number of PS plates 3 are sandwiched between the plate base 2 and the top plate 4 and the top plate 4 is fastened to the plate base 2 with bolts 5 and nuts 8 to form the PS plate. 3 is fixed in the thickness direction.
In the packaging method of the prior art B, a large number of PS plates 10 are stacked on the plate table 24, and then tied with a string 12 to fix the PS plate 10 in the thickness direction.
[0005]
In the packaging method of prior art C, a large number of PS plates 104 are stacked on the platen 105, and then the PS plate 104 is tightly packed in a lateral direction with a moisture-resistant film, and further, a light-shielding package such as cardboard is provided. Wrapping with the body.
In the packaging method shown in FIG. 1 of prior art D, after the PS plate 1 is stacked on the platen, the PS plate 1 is fixed in the surface direction with a stretch film 9 having both light shielding properties, moisture proofing properties and binding properties. Is. Further, in the packaging method shown in FIG. 2, the PS plate 1 is placed on the bottom plate 5 and leaned against the back plate 6, and the PS plate is sandwiched between the back plate 6 and the top plate 11. Wrapping with stretch film 9.
[0006]
[Problems to be solved by the invention]
However, the packaging methods of the prior art A and B fix the PS plate in the thickness direction, so the PS plates are in close contact with each other, and the PS plate is automatically made by an automatic plate making machine (FNR 401, 402 manufactured by Fuji Photo Film Co., Ltd.). Etc.), the problem arises that the PS plate does not peel off when the sheets are separated and supplied one by one.
[0007]
Such a problem can be solved by fixing the PS plate in the surface direction as shown in the prior arts C and D. However, the packaging methods of the prior arts C and D have a drawback that the PS plate easily shifts due to vibration or impact during transportation, although the PS plate is fixed in the surface direction. Such problems can be resolved by increasing the film clamping force, but with conventional packaging methods, the clamping force is concentrated only on the corners of the PS plate, so the clamping force can be applied to the PS plate efficiently. There is a disadvantage that can not be.
[0008]
The present invention has been made in view of such circumstances, and a photosensitive film capable of preventing misalignment of stacked photosensitive lithographic printing plates by efficiently applying a film clamping force to the photosensitive lithographic printing plate. It aims at providing the packaging method of a sex lithographic printing plate.
[0009]
[Means for solving the problems]
In order to achieve the above object, the present invention achieves the above object by packaging the outer periphery of a photosensitive lithographic printing plate having a predetermined number of layers on a platen with a light shielding package. The photosensitive lithographic printing is attached to the platen, and the cardboard is disposed on the outer periphery of the light-shielding package to cover the outer periphery, and the stacked photosensitive lithographic printing is performed at a position corresponding to the center of the side of the outer periphery of the cardboard. The photosensitive member is provided with a restoring force of the film by providing a reinforcing member along the thickness direction of the plate and winding the outer periphery of the corrugated cardboard including the reinforcing member a predetermined number of times in a stretched film. A lithographic printing plate is fastened and fixed.
[0010]
According to the present invention, the tightening force generated by the restoring force of the film is generated not only at the corners of the photosensitive lithographic printing plate, but also from the reinforcing member provided on the outer periphery of the cardboard. Therefore, according to the present invention, the tightening force of the film applied to the photosensitive lithographic printing plate can be enhanced by providing the reinforcing member. Therefore, the present invention can efficiently apply the film clamping force to the photosensitive lithographic printing plate, and therefore can prevent misalignment of the stacked photosensitive lithographic printing plates.
[0011]
The film to be applied to the photosensitive lithographic printing plate may be tightened by applying a contraction force generated by heat shrinkage by a heat-shrinkable film as shown in claim 2 in addition to a restoring force by a stretchable film. good.
On the other hand, as shown in claim 3, if a buffer member is disposed on the outer periphery of the photosensitive lithographic printing plate, and the photosensitive lithographic printing plate is packaged in a light-shielding package in this state, the photosensitive lithographic printing plate is displaced. Even when a force is applied, the force is buffered by the buffer member. Therefore, the present invention can reliably prevent the deviation of the photosensitive lithographic printing plate.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of a method for packaging a photosensitive lithographic printing plate according to the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a longitudinal sectional view of a laminated PS plate package packaged by the photosensitive lithographic printing plate packaging method of the present invention, and FIG. 2 is a transverse sectional view. Hereinafter, the packaging method of the laminated PS plate will be described with reference to FIGS.
[0013]
As shown in FIGS. 1 and 3, the PS plate 10 is placed in a state where a large number of PS plates 10 are stacked on a plate base 14 installed on a gantry 12 (see FIG. 1). Corrugated cardboards 18, 18... That are buffer members are arranged on the outer periphery of the stacked laminated PS plate 16. These corrugated boards 18, 18... Are provided so as not to cause a step between the platen base 14 and the laminated PS plate 16 and to buffer the force when a force in the displacement direction is applied to the laminated PS plate 16. ing. In the present embodiment, the cardboard 18 is provided on two of the four outer peripheral surfaces of the laminated PS plate 16, but it is more effective to provide the cardboard 18 on the entire surface. The buffer member is not limited to the corrugated cardboard 18, and paperboard, molded paper pulp, paper honeycomb, polyethylene foam, polystyrene foam, urethane foam, or air cap can be applied.
[0014]
The laminated PS plate 16 including the outer periphery of the cardboard 18 is packaged with kraft paper 20 which is a light-shielding package as shown in FIG. After wrapping the laminated PS plate 16, the kraft paper 20 is stuck to each other by the adhesive tape 22 and to the platen 14. The light-shielding package is not limited to kraft paper 20, and various plastic films such as kraft paper and polyethylene (PE) multilayer, and kraft paper, polyethylene (PE) and aluminum foil multilayer can be applied. .
[0015]
As shown in FIG. 5, a cardboard 24 is disposed on the entire outer periphery of the kraft paper 20. The corrugated cardboard 24 is a corrugated cardboard for exterior that also has light shielding properties, and double-sided cardboard (JIS standard: K280-SPC125-K280) is used.
On the outer periphery of the corrugated cardboard 24, reinforcing corrugated cardboards (or objects having equivalent performance) 26, 26. These reinforced cardboards 26, 26... Are provided along the thickness direction of the laminated PS plate 16 at positions corresponding to the central portions of the four sides of the PS plate 10. The reinforced corrugated cardboard 26 is a corrugated cardboard for tightening the laminated PS plate 16 in the lateral direction, and has a stronger strength than the double-faced cardboard (JIS standard: K280-SPC125-SPC280-SPC125-K280). Is used.
[0016]
On the outer periphery of the corrugated cardboard 24 including the reinforced cardboards 26, 26..., A stretch film 28 having elasticity as shown in FIG. 6 is provided a plurality of times in the outer peripheral direction of the laminated PS plate 16 (in this embodiment, eight times). It is wound. By this stretch film 28, the laminated PS plate 16 is fastened and fixed in the surface direction. As the stretch film 28, a single layer film such as low density polyethylene (LDPE), linear polyethylene (LLDPE), ethylene vinyl acetate copolymer (EVA), or a multilayer film in combination of these can be applied. The thickness is preferably 15 to 50 μm and can be extended by 120 to 200%.
[0017]
The stretch film 28 is wound while being stretched by 120 to 200%. At this time, the laminated PS plate 16 is clamped in the surface direction by the restoring force that the stretch film 28 tries to shrink. Thereby, the laminated PS plate 16 is fixed.
When a heat shrinkable film is used instead of the stretch film 28, a single layer film such as low density polyethylene (LDPE), polypropylene (PP), ethylene vinyl acetate copolymer (EVA), or the like A combined multilayer film can be applied, and the thickness is preferably 100 to 200 μm.
[0018]
In FIG. 7, the upper surface opening 32 of the laminated PS plate 16 wound with the stretch film 28 is shielded by the upper lid 30. The upper lid 30 is fixed to the stretch film 28 by craft adhesive tapes 34, 34. Reference numeral 36 denotes a dew condensation prevention caution label affixed to the upper lid.
In the laminated PS plate 16 packaged in this way, the tightening force generated by the restoring force of the stretch film 28 (the force that the stretch film 28 shown by arrow A in FIG. 8 tries to shrink) is indicated by arrow B in the figure. As shown, it occurs at the corner of the laminated PS plate 16 and also from the reinforced cardboard 26 provided on the outer periphery of the cardboard 24 as shown by the arrow C in the figure.
[0019]
Therefore, the packaging method according to the present embodiment can increase the tightening force of the stretch film 28 applied to the laminated PS plate 16 by providing the reinforced cardboard 26. Therefore, in this embodiment, the tightening force of the stretch film 28 can be efficiently applied to the laminated PS plate 16, and thus the misalignment of the stacked photosensitive planographic printing plates can be prevented.
[0020]
On the other hand, in the present embodiment, as shown in FIG. 3, since the corrugated cardboard 18 serving as a buffer member is disposed on the outer periphery of the laminated PS plate 16, the laminated PS plate 16 is displaced by the arrow D in FIG. Is applied, the force is buffered by the cardboard 18. Therefore, the packaging method of the present embodiment can reliably prevent the laminated PS plate 16 from being displaced.
[0021]
[Experimental Example 1]
The amount of misalignment of the laminated PS plate due to vibration and impact during transportation was confirmed by a tilt impact test (JIS Z0205). The amount of deviation was the amount of deviation from the edge of the platen to the edge of the PS plate that was most misaligned.
Comparative example: A laminated PS plate was sandwiched between a platen and a top plate, and a laminated PS plate was fixed in the thickness direction with four bolts (corresponding to Conventional Technology A). The nut tightening torque at this time was set to 50 kgfcm.
[0022]
Main plan: A stretch film was prepared by winding it 10 times with an elongation of 40%. The experimental result was 10 mm in the comparative example, but 3 mm in the present plan. Therefore, in this proposal, it is possible to suppress misalignment of the laminated PS plate due to vibration and impact during transportation.
[Experimental example 2]
The occurrence rate of troubles of separation failure when the automatic plate making machine was applied was confirmed by an automatic plate making machine (FNR401) manufactured by Fuji Photo Film Co., Ltd.
[0023]
The experimental result was 15% in the comparative example, and 0% in the present plan. Therefore, in this plan, it is possible to prevent the occurrence of poor separation of the PS plate.
[0024]
【The invention's effect】
As described above, according to the packaging method of the photosensitive lithographic printing plate according to the present invention, the reinforcing member is provided on the outer periphery of the outer corrugated cardboard, and the film is also tightened from the reinforcing member to the photosensitive lithographic printing plate. Since it did in this way, the clamping force of a film can be efficiently applied to a photosensitive lithographic printing plate, Therefore The shift | offset | difference of the laminated | stacked photosensitive lithographic printing plate can be prevented.
[0025]
Further, according to the present invention, a buffer member is arranged on the outer periphery of the photosensitive lithographic printing plate, and the buffer member is used to buffer the force of the photosensitive lithographic printing plate to shift. It can be surely prevented.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a laminated PS plate packaged by the packaging method of the present embodiment. FIG. 2 is a transverse sectional view of the laminated PS plate packaged by the packaging method of the present embodiment. Explanatory drawing in which corrugated cardboard as a buffer member is arranged on the outer periphery of the plate. [FIG. 4] Explanatory drawing in which the laminated PS plate is packaged in a light-shielding package. Explanatory diagram with corrugated cardboard and reinforced corrugated cardboard [Fig. 6] Explanatory diagram of outer cardboard containing reinforced corrugated cardboard wound with a stretch film [Fig. 7] Explanatory diagram with a top cover attached to a wound with stretch film [ FIG. 8 is a schematic diagram for explaining the tightening force of the stretch film. FIG. 9 is a schematic diagram for explaining a state in which a force in the displacement direction is applied to the laminated PS plate.
10 ... PS plate 14 ... Plate table 16 ... Laminated PS plate 18 ... Cardboard (buffer member)
20 ... Kraft paper (light-shielding packaging)
24 ... Cardboard for exterior 26 ... Reinforced cardboard 30 ... Upper lid

Claims (3)

The outer periphery of the photosensitive lithographic printing plate stacked a predetermined number on the plate base is packaged with a light-shielding package, and the light-shielding package is attached to the plate base.
A corrugated cardboard is disposed on the outer periphery of the light-shielding package to provide an exterior, and a reinforcing member is provided along the thickness direction of the stacked photosensitive lithographic printing plate at a position corresponding to the central portion of the side of the outer periphery of the corrugated cardboard.
The outer periphery of the corrugated cardboard including the reinforcing member is wound a predetermined number of times with the stretchable film stretched, whereby the photosensitive lithographic printing plate is fastened and fixed by the restoring force of the film. Packaging method for photosensitive lithographic printing plate. The outer periphery of the photosensitive lithographic printing plate stacked a predetermined number on the plate base is packaged with a light-shielding package, and the light-shielding package is attached to the plate base.
A corrugated cardboard is disposed on the outer periphery of the light-shielding package to provide an exterior, and a reinforcing member is provided along the thickness direction of the stacked photosensitive lithographic printing plate at a position corresponding to the central portion of the side of the outer periphery of the corrugated cardboard.
The photosensitive lithographic printing plate is characterized in that the photosensitive lithographic printing plate is clamped and fixed by winding the outer periphery of the corrugated board including the reinforcing member a predetermined number of times with a heat-shrinkable film and thermally shrinking the film. Plate packaging method.   After placing a plate-shaped buffer member on the outer periphery of the photosensitive lithographic printing plate stacked on the platen, the outer periphery of the photosensitive lithographic printing plate including the buffer member is packaged with the light-shielding package. The method of packaging a photosensitive lithographic printing plate according to claim 1 or 2, wherein

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