JP2008195434A - Packaging structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging structure which can prevent the surface of a lithographic printing plate from being damaged by a local stress, and can effectively prevent a quality failure from occurring. <P>SOLUTION: This packaging structure 10 includes a pallet 20, a lithographic printing plate bundle group 12, a plate-like foamed block 28, a top board 30, a block 34, and a cloth belt 32, wherein, for the lithographic printing plate bundle group 12, one or a plurality of lithographic printing plate bundles 14, for which lithographic printing plates 11 are stacked in the thickness direction, are stacked on the pallet 20. The plate-like foamed block 28 is stacked on the lithographic printing plate bundle group 12. The top board 30 is arranged on the foamed block 28. The block 34 is installed approximately at the central section on the top surface of the top board 30. The cloth belt 32 is wound around and restrains the lithographic printing plate bundle group 12 in a manner to hold the lithographic printing plate bundle group 12 between the pallet 20 and the top board 30. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a packaging structure, and more particularly, to a packaging structure that does not cause a quality failure in a sheet due to vibration or impact during transportation or cargo handling.

  In recent plate making methods (including electrophotographic plate making methods), lithographic printing plates such as photosensitive printing plates and heat-sensitive printing plates are widely used in order to facilitate automation of the plate making process. A lithographic printing plate is generally subjected to surface treatment such as graining, anodic oxidation, silicate treatment, and other chemical conversion treatments on a support such as a sheet-like or coil-like aluminum plate alone or in combination, and then a photosensitive layer. Or it manufactures by cut | disconnecting to a desired size, after performing a heat-sensitive layer application | coating and a drying process. The manufactured lithographic printing plate is subjected to plate making processes such as exposure, development, and gumming, and is set in a printing machine. Then, ink is applied to the lithographic printing plate set in the printing machine, and this is transferred to print characters, images, etc. on the paper.

  When handling a lithographic printing plate, a large number of lithographic printing plates are laminated in the thickness direction to form a lithographic printing plate bundle. If necessary, the lithographic printing plate bundle can be covered with a light-shielding packing material such as aluminum craft paper. In general, packing, packing on a loading member such as a pallet or skid, and packing are performed. By adopting such a packaging structure, it is possible to reduce the number of times of handling and transport and store at low cost, and to prevent deformation and damage of the planographic printing plate during transport and storage. .

FIG. 12 of Patent Document 1 describes a packaging structure in which a plurality of planographic printing plate packages are horizontally stacked between a bottom plate and a top plate. In this packaging structure, the bottom plate and the top plate are connected by a plurality of support members, and the packaging body of the planographic printing plate is clamped and fixed by the bottom plate and the top plate.
JP 2002-234272 A

  However, Patent Document 1 has a problem that when the tightening force between the bottom plate and the top plate is increased, the top plate is warped, and the package of the planographic printing plate is fixed only at the peripheral portion. It was. As described above, when the lithographic printing plate is locally pressed strongly, the photosensitive surface and the heat-sensitive surface are easily damaged. In particular, in the case of a laser exposure type lithographic printing plate widely used in recent years, the lithographic printing up to that time Since the plate-making surface is weaker than that of the plate, the plate-making surface is easily damaged by vibration and impact during transportation and cargo handling, and improvements have been demanded.

  Further, in the conventional packaging structure, when a plurality of lithographic printing plate packagings are stacked, stress concentration occurs at the folded portion of the packaging material, and the surface of the lithographic printing plate is easily damaged.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a packaging structure that can prevent the surface of a lithographic printing plate from being damaged by local stress and can effectively prevent a quality failure. And

  In order to achieve the above object, the invention according to claim 1 is a stacking table and a stack of sheet bundles in which one or a plurality of sheet stacks in which sheet-like materials are stacked in the thickness direction are stacked on the stacking table. Body, a plate-like foam block laminated on the sheet bundle laminate, a top plate disposed on the foam block, and a substantially central portion of the top surface of the top plate, the top plate A packaging structure comprising: a contact block formed with a narrower width; and a belt that is wound and restrained so as to sandwich the sheet bundle laminated body between the stacking base and the top plate.

  According to the invention of claim 1, since the block is provided on the top plate, the central portion of the top plate can be pressed by the block, and stress is prevented from being concentrated on the peripheral portion of the sheet bundle laminate. be able to. According to the invention of claim 1, since the plate-like foam block is provided between the top plate and the sheet bundle laminate, the stress can be evenly dispersed. Thereby, it can prevent that a sheet-like thing is damaged by local concentration of stress. In the present invention, the foam block includes a foam block made of polypropylene or polyethylene, and a foam block made of a biodegradable resin, in addition to polystyrene foam.

  According to the present invention, the block is provided on the top plate so as to press the center portion of the top plate, and further, the plate-like foam block is provided between the top plate and the sheet bundle laminated body. Can be dispersed, and damage to the sheet-like material due to local concentration of stress can be prevented.

  Hereinafter, preferred embodiments of a packaging structure according to the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a perspective view showing a packaging structure in the present embodiment, and FIG. 2 is an exploded view thereof. FIG. 3 is a perspective view showing a planographic printing plate bundle, and FIG. 4 is an exploded view thereof.

  The packaging structure 10 shown in FIGS. 1 and 2 is used when a large number of lithographic printing plates 11 (see FIG. 4: equivalent to sheet-like material) are conveyed as a lithographic printing plate bundle group (equivalent to a sheet bundle laminate) 12. This is a packaging form. The lithographic printing plate bundle group 12 is configured by laminating a lithographic printing plate bundle (corresponding to a sheet bundle) 14 in a predetermined number (for example, 4 bundles) in the thickness direction. The planographic printing plate bundle group 12 may be packaged with a packaging material.

  As shown in FIG. 4, each lithographic printing plate bundle 14 is obtained by laminating a plurality of lithographic printing plates 11 and wrapping the laminate with a light-shielding / moisture-proof interior material 16. As shown in FIG. The lithographic printing plate 11 may be any of a photosensitive type, a thermal type, and a laser exposure type, and it is preferable to laminate a slip sheet (not shown) between the lithographic printing plates 11. Further, as the interior material 16, a black polyethylene film, a kraft paper laminated with an aluminum foil or a polyethylene film, or the like is used.

  As shown in FIG. 2, the lithographic printing plate bundle group 12 is placed on a pallet (corresponding to a loading table) 20. The pallet 20 includes a substantially rectangular stacking plate 22 and a plurality of legs 24 attached to the lower surface of the stacking plate 22. The leg portion 24 is formed in a block shape and is disposed with a predetermined gap, and a space for inserting a forklift or a fork of a handlift is formed between the leg portion 24 and the leg portion 24. A form in which a bottom plate parallel to the loading plate 22 is attached below the leg portion 24 is also possible.

  The lithographic printing plate bundle group 12 described above is placed on the stacking plate 22 of the pallet 20. At that time, each planographic printing plate bundle 14 is laminated in parallel (that is, substantially horizontally) with the stacking plate 22. On the planographic printing plate bundle group 12, a shock-absorbing cardboard (hereinafter referred to as a contact ball) 26 may be laminated. The contact ball 26 is formed in a plate shape having the same size as the upper surface of the planographic printing plate bundle group 12. Note that the size of the contact ball 26 may be larger than that of the lithographic printing plate bundle group 12, and in that case, a size smaller than a top plate 30 described later is preferable.

  A foam block 28 is laminated on the contact ball 26. The foam block 28 is formed to have the same size as the upper surface of the lithographic printing plate bundle group 12 or slightly larger than the upper surface of the lithographic printing plate bundle group 12, and the thickness thereof is determined when a cloth belt 32 described later is fastened. It is set so that the pressing force can be evenly distributed. As the foam block 28, a foam block made of polypropylene or polyethylene, or a foam block made of biodegradable resin is used in addition to polystyrene foam. For example, a JSP foamed polyethylene “L-block” foaming magnification of 20 times, a thickness of 30 mm, and a width dimension of W-10 mm is used. The size of the foam block 28 is preferably (the dimension of the planographic printing plate bundle group 12 + 20 mm) or more and (the dimension of the stacking plate 22 of the pallet 20) or less. The thickness of the foam block 28 is preferably 25 mm or more and 35 mm or less in terms of transportability and buffer capacity.

  A top plate 30 is laminated on the foam block 28. The top plate 30 is formed in a rectangular plate shape with wood or the like, and the width dimension thereof is the same as or slightly larger than the width dimension of the planographic printing plate bundle group 12. Therefore, when the packaging structure 10 is formed, the upper edge of the lithographic printing plate bundle group 12 is covered and protected by the top plate 30, so that the lithographic printing plate bundle group 12 can be prevented from being damaged.

  Blocks (corresponding to contact blocks) 34 and 34 are attached to the top plate 30. The blocks 34 and 34 are formed in a rectangular parallelepiped shape with wood or the like, and are attached to the winding positions of the cloth belts 32 and 32. As shown in FIG. 1, the cloth belts 32, 32... Are wound at four positions so as to pass between the leg portions 24, 24 of the pallet 20. Blocks 34, 34 are arranged. The block 34 may be fixed to the top plate 30 or may be detachably attached.

  As shown in FIG. 5, the block 34 is formed such that the width dimension C is smaller than the width dimension L of the top plate 30 and the width dimension W of the planographic printing plate bundle group 12. Further, the block 34 is attached to the central portion of the top plate 30 in the width direction. Therefore, the top plate 30 protrudes on both sides with respect to the block 34, and the protrusion amount E = (LC) / 2. In the present embodiment, the protrusion amount E is set to 160 mm or more and 350 mm or less. When the protruding amount E is less than 160 mm or more than 350 mm, the planographic printing plate 11 is displaced during transportation and a quality failure occurs. Specifically, when the lithographic printing plate 11 is a PS plate, a defect (film veri- fication) that appears white during development occurs. The protrusion amount E is preferably 100 mm or greater and 450 mm or less, and more preferably 150 mm or greater and 350 mm or less.

  The block 34 is set so that the angle θ is 15 ° or more and 40 ° or less, where θ is the angle between the fabric belt 32 and the top plate 30 when the fabric belt 32 is wound and stretched. This is because when the angle θ is less than 11.8 °, the pressing force of the central portion of the top plate 30 by the block 34 is reduced, and the planographic printing plate 11 is displaced. Further, if the angle θ is too large, the block 34 becomes large and bulky, and the balance is deteriorated. The angle θ is preferably 15 ° or more and 40 ° or less, and more preferably 18 ° or more and 40 ° or less.

  Next, a procedure for producing the packaging structure 10 will be described below.

  First, as shown in FIG. 4, a predetermined number of lithographic printing plates 11, for example, 20 to 30 are laminated in the thickness direction, and then packed with an interior material 16 to produce a lithographic printing plate bundle 14. As shown in FIG. 2, the prepared planographic printing plate bundle 14 is placed on the stacking plate 22 of the pallet 20 in a predetermined number of bundles (for example, four bundles) in the thickness direction. Thereby, the planographic printing plate bundle group 12 is formed. Next, the contact ball 26 is laminated on the planographic printing plate bundle group 12, and the foam block 28 is stacked on the contact ball 26. Further, after the top plate 30 is overlaid on the foam block 28, the fabric belts 34, 34 are wound. The cloth belts 34, 34 make the pallet 20 and the top plate 30 at least one turn and are in a state of being tensioned with a predetermined tension. Accordingly, the top plate 30 is pressed toward the pallet 20, so that the planographic printing plate bundle group 12 can be sandwiched between the top plate 30 and the pallet 20. If the tension of the cloth belts 32, 32,... Is too large, the top plate 30 is deformed. If it is too small, the lithographic printing plate bundle group 12 is insufficiently fixed, and is preferably 3400N or more and 4400N or less, preferably 3700N or more and 3900N. The following is more preferable. The tension adjusting means for the cloth belts 32 and 32 is not particularly limited. For example, the tension of the cloth belt 32 is controlled to a desired value by passing the cloth belt 32 through a metal fitting having a tension adjusting function.

  Next, the operation of the packaging structure configured as described above will be described.

  When the lithographic printing plate 11 is wrapped by folding the interior material 16 as shown in FIGS. 3 and 4, the lithographic printing plate bundle 14 partially differs in the number of overlapping interior materials 16. That is, in the portion where the interior material 16 does not overlap at all, the interior material 16 is arranged on the upper surface and the lower surface of the laminate of the planographic printing plate 11 to add a thickness of two sheets, whereas the interior material 16 overlaps most. In the portion, about six sheets of thickness are added by the folded interior material 16 and the tape 18. For this reason, the thickness of the lithographic printing plate bundle 14 after packaging changes locally. Accordingly, when the lithographic printing plate bundle group 12 in which the lithographic printing plate bundles 14 are laminated is fastened and pressed by the cloth belt 32, the portion where the number of overlapping interior materials 16 is large is pressed strongly, and the number of overlapping interior materials 16 overlaps. The pressing force becomes weaker in the part where there is little. Thus, when the planographic printing plate bundle group 12 is strongly pressed locally, the photosensitive surface and heat-sensitive surface of the surface are liable to be damaged. In particular, in the case of a laser exposure type lithographic printing plate, there is a problem that it is easily damaged because the plate-making surface is weak.

  On the other hand, in the present embodiment, since the foam block 28 is interposed between the planographic printing plate bundle group 12 and the top plate 30, the foam block 28 acts as a cushioning material and fastens the cloth belt 32. The pressing force at that time is dispersed and the pressing force is applied to the lithographic printing plate bundle group 12 substantially evenly. Therefore, it is possible to prevent a local pressing force from being applied to the internal lithographic printing plate 11 and to prevent the lithographic printing plate 11 from being damaged.

  In the present embodiment, a block 34 is provided at the center of the top plate 30 in the width direction, and the fabric belt 32 is wound around the block 34. Accordingly, the central portion in the width direction of the planographic printing plate bundle group 12 is pressed by the block 34. Therefore, it is possible to prevent a local pressing force from being applied to the edge portion of the lithographic printing plate bundle group 12, and it is possible to prevent occurrence of a planar failure of the lithographic printing plate 11. In particular, in the present embodiment, since the block 34 is provided such that the protruding amount E is 160 to 350 mm and the angle θ is 15 ° or more, a sufficient pressing force can be obtained at the center, and the occurrence of a planar failure is caused. Can be reliably prevented.

  In the above-described embodiment, the rectangular parallelepiped block 34 is provided. However, the shape of the block 34 is not limited to this, and for example, a hole may be formed in the block 34 to reduce the weight. At that time, it is preferable in terms of strength to form the holes so as to be orthogonal to the winding direction of the fabric belt 32.

The perspective view which shows the packaging structure in this Embodiment Exploded view of the packaging structure of FIG. Perspective view showing a planographic printing plate bundle Exploded view of the planographic printing plate of FIG. Side view of the packaging structure of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Packaging structure, 12 ... Lithographic printing plate bundle group, 14 ... Lithographic printing plate bundle, 16 ... Interior material, 18 ... Tape, 20 ... Pallet, 22 ... Laminate board, 24 ... Leg part, 26 ... Hitting ball, 28 ... foam block, 30 ... top plate, 32 ... cloth belt, 34 ... block

Claims (1)

A loading platform;
A sheet bundle laminate in which one or a plurality of sheet bundles in which sheet-like materials are laminated in the thickness direction are laminated on the lamination table;
A plate-like foam block laminated on the sheet bundle laminate;
A top plate disposed on the foam block;
A contact block provided at a substantially central portion of the top surface of the top plate and formed with a width narrower than the top plate;
A belt that is wound and restrained so as to sandwich the sheet bundle laminate between the stacking base and the top plate;
A packaging structure characterized by comprising:

Images