JP2005041643A - Bunched laminate reversing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bunched laminate reversing method for improving the yield and productivity of a bunched laminate when reversed and achieving serial work as well. <P>SOLUTION: The bunched laminate reversing method uses a reversing means for reversing the bunched laminate 16 having a plurality of plate materials laminated. A carrying means carries the bunched laminate 16 to a predetermined reversing position, and a preset-width adhesive tape 15 is applied over at least one end side of the bunched laminate 16 at the upper and lower parts of at least one portion to be fixed. The carried bunched laminate 16 is held in the direction of lamination by a holding member of the reversing means and the held bunched laminate 16 is reversed by a reversing member of the reversing means. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a laminate bundle reversal method, and more particularly to a laminate bundle inversion method suitable for reversing a laminate bundle formed by laminating planographic printing plates such as PS plates.

  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 obtained by subjecting a support such as a sheet-like or coil-like aluminum plate to surface treatment such as graining, anodizing, silicate treatment, and other chemical conversion treatment alone or in combination, and then photosensitive layer Alternatively, a heat-sensitive layer (hereinafter collectively referred to as “coating film”, a surface on which the coating film is applied is referred to as an “image forming surface”, and a surface on which the coating film is not formed is referred to as a “non-image forming surface”). It is manufactured by cutting to a desired size after performing a drying treatment.

  This planographic printing plate is subjected to plate making processing such as exposure, development processing, 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, and the like on the paper surface.

  During the production of a lithographic printing plate, a plurality of lithographic printing plates cut into a rectangular shape having a predetermined size may be laminated in the thickness direction to form a laminated bundle. By packaging this laminated bundle, a plurality of planographic printing plates can be handled together (transported, stored, etc.), and the handling efficiency can be improved.

  By the way, among lithographic printing plates, there is a so-called single-sided product in which a coating film is formed only on one side of a support. When loading this single-sided product into a processing machine such as a setter, if the orientation of the lithographic printing plate in the transported state (vertical direction) does not match the orientation at the time of loading, the user of the lithographic printing plate It is necessary to invert and load the lithographic printing plate one by one, which puts a heavy workload on the user.

  Therefore, if the laminated bundle of planographic printing plates is wrapped in a state of being inverted in advance, it is not necessary for the user to invert and the user's work load is reduced. In consideration of such circumstances, the applicant has made a proposal regarding packaging of a planographic printing plate (see Patent Document 1).

  However, in general, a laminated bundle of lithographic printing plates often has a weight of about 15 to 30 kg. Therefore, if it is turned over manually, the load on the operator is large. In addition, if the plate is reversed carelessly, the planographic printing plate constituting the laminated bundle may be displaced.

  On the other hand, there is also a method of reversing the stacking bundle in the stacking direction with a reversing forklift, etc., but when the height (thickness) of the stacking bundle is above a certain value or below a certain value, it cannot be nipped with a reversing forklift There is. If the height of the laminated bundle is low, it is possible to sandwich a plurality of laminated bundles by further stacking them with an inverted forklift, but the laminated bundles are further stacked before reversing and separated again after reversing. And the work process is increased.

  Moreover, in any method, it is difficult to improve productivity because it is performed outside the processing line (automatic line for cutting and packaging) of the lithographic printing plate, and it is impossible to perform integrated processing from cutting to packaging. .

In order to solve such problems, the applicant has proposed a technique for reversing the stacking bundle (see Patent Document 2). In this technique, a laminated bundle is conveyed by a conveying member, the conveyed laminated bundle is sandwiched in the laminating direction by a sandwiching member, and the conveying member and the sandwiching member are reversed while the laminated bundle is sandwiched by the reversing member. A reversing device and a stacking bundle reversing method for reversing a stacking bundle using the stacking bundle reversing device.
JP 2002-29173 A JP 2002-370818 A

  However, it is pointed out that the conventional stack bundle reversal technique also causes problems when the stack is reversed. That is, when reversing the laminated bundle, it is necessary to sandwich the laminated bundle while applying a predetermined pressure to prevent the deviation of the bundle. If the pressure is inappropriate (excessive), the coating film of the lithographic printing plate It is easy to produce a defect called “fogging” that is in a state similar to that in which exposure is performed. On the other hand, when the pressure for sandwiching the laminated bundle is insufficient, the bundle is displaced, and fine control is required for controlling the sandwiching pressure, which may cause a decrease in yield and productivity.

  In particular, recent lithographic printing plates tend to have a reduced coefficient of friction due to the wax component on the surface. For example, the friction coefficient of the conventional product is about 0.5, but is reduced to about 0.3. Moreover, recent lithographic printing plates have a reduced surface strength, and when pressed at 1000 Pa or higher, the surface is damaged or fogged, resulting in defects during printing.

  On the other hand, when the existing reversing device is reversed while holding the laminated bundle with a pressure of 1000 Pa or less, the bundle is often displaced. Moreover, this clamping pressure is close to the operation unstable region of the existing reversing device.

  The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a method for reversing a laminated bundle that improves yield and productivity when reversing a laminated bundle and can perform integrated processing.

  In order to achieve the above object, the present invention provides a stacking bundle reversing method in which a stacking bundle in which a plurality of plate-like materials are stacked is reversed by a reversing unit, and the stacking bundle is transported to a predetermined reversing position by a transporting unit. A step of fixing an adhesive tape having a predetermined width over and over at least one location of at least one end of the laminated bundle, and fixing the conveyed laminate bundle to the reversing means And sandwiching the laminated bundle sandwiched by the reversing member of the reversing means.

  According to the present invention, before reversing the laminated bundle, the adhesive tape having a predetermined width is stretched over at least one place on at least one end of the laminated bundle, and this place is fixed. As a result, even if the stacked bundle is sandwiched with a pressure that does not cause so-called “fogging”, the bundle does not shift during reversal. As a result, yield and productivity can be improved, and integrated machining is also possible.

  In the present invention, in the reversing step, it is preferable that the reversal is performed so that the end side on which the adhesive tape is stretched is positioned on the lower side. In this way, if the end side over which the adhesive tape is stretched at the time of reversal is positioned on the lower side, an effect of preventing the bundle shift by this adhesive tape can be obtained.

  Moreover, in this invention, it is preferable that a protective sheet is distribute | arranged to the uppermost layer and lowermost layer of the said laminated bundle. As described above, the protective sheet is disposed on the uppermost layer and the lowermost layer of the laminated bundle, so that the effect of fixing with the adhesive tape can be further exhibited, and the effect of the present invention can be further exhibited. In addition, the laminated bundle is protected by a protective sheet (generally referred to as a “contact ball”).

  In the present invention, the reversing means includes a sandwiching member that sandwiches the stacked bundle that has been transported by the transporting means and stopped at a predetermined reversing position, and a reversing member that reverses the sandwiching member. It is preferable. This is because the effect of the present invention can be further exerted by the reversing means having such a configuration.

  As described above, according to the present invention, before reversing the laminated bundle, the adhesive tape having a predetermined width is stretched over at least one place on at least one end of the laminated bundle to fix the place. As a result, even if the stacked bundle is sandwiched with a pressure that does not cause so-called “fogging”, the bundle does not shift during reversal. As a result, yield and productivity can be improved, and integrated machining is also possible.

  Hereinafter, preferred embodiments of the method for reversing a laminated bundle according to the present invention will be described with reference to the accompanying drawings. 1 to 4 show a laminated bundle reversing device 10 applied to the present invention. That is, FIG. 1 is a side view of the laminated bundle reversing device 10, FIG. 2 is a plan view showing a part of the laminated bundle reversing device 10, and FIG. 3 is a front view of the laminated bundle reversing device 10. 4 is a cross-sectional view taken along line 4-4 of FIG.

  The laminated bundle reversing device 10 is disposed between two conveyors 12 and 14 constituting a processing line for a lithographic printing plate, and is incorporated in the processing line. In this processing line, a lithographic printing plate of a predetermined size is cut with a protective paper called a slip sheet attached as necessary, and a plurality of lithographic printing plates are laminated in the thickness direction. The laminated bundle 16 (see FIG. 1) is configured.

  The stacked bundle reversing device 10 can reverse the stacked bundle 16 conveyed in the direction of arrow A without stopping or decelerating the operation of the processing line. Hereinafter, the “transport direction” simply refers to the transport direction of the stack 16 and the “width direction” refers to the width direction of the stack 16 (a direction perpendicular to the transport direction). Moreover, in each figure, the conveyance direction is appropriately indicated by an arrow A, and the width direction is appropriately indicated by an arrow B.

  As shown in FIGS. 1 to 3, the stacked bundle reversing device 10 has a pair of frames 18 and 18 fixed to the installation surface G. As shown in FIGS. 2 and 3, the apparatus main body 22 of the stacked bundle reversing apparatus 10 is supported between the frames 18 and 18 via the bearings 20 and 20, and can rotate around the bearing 20. Has been. The center of rotation is indicated by a center line C.

  The apparatus main body 22 has a rectangular frame 24 that is symmetrical with respect to a horizontal plane passing through the center line C. In the frame body 24, a pair of support plates 26 and 26 are arranged symmetrically in the vertical direction. The support plates 26 and 26 are attached to the frame body 24 so as to be parallel to each other via nip cylinders 28 and 28, respectively, and are driven in the vertical direction while maintaining the parallel state by driving the nip cylinders 28 and 28. To move to. The driving of the nip cylinder 28 is controlled by a control device (not shown, the same applies hereinafter) and is driven at a predetermined timing. Further, the nip cylinders 28 and 28 are driven synchronously, and the support plates 26 and 26 are also moved toward each other (see FIG. 8 or 9) or separated (see FIG. 1 or FIG. 4).

  From each support plate 26, a plurality of arms 30, 30... Extend in a direction toward the other support plate 26. A substantially elongated guide plate 32 is attached to the tip of the arm 30. 2 and 3, each guide plate 32 has its longitudinal direction aligned with the transport direction (arrow A direction) and arranged in parallel in the width direction (arrow B direction) with a certain interval. Are arranged as follows. The surfaces of the guide plates 32, 32 facing each other vertically (surface on the center line C side) are sandwiched surfaces, and the laminated bundle 16 is sandwiched in the stacking direction by the sandwiched surfaces as will be described later.

  A total of two shafts 34, 34 are stretched over the frame body 24, one above the other along the width direction (arrow B direction). A plurality of drive pulleys 36, 36... Are attached to the respective shafts 34 so as to be positioned between the arms 30. Conveyor drive motors attached to the outside of the frame body 24 are attached to the drive pulleys 36. The rotational driving force of 38 is transmitted through the driving belt 40.

  Further, between the guide plates 32 and 32 in the width direction (arrow B direction), an auxiliary plate 42 and a driven pulley 44 corresponding to each drive pulley 36 are attached to the frame body 24 via attachment members (not shown). Is attached. An endless transport belt 46 is wound around one drive pulley 36 and auxiliary plate 42 and a plurality of (four in this embodiment) driven pulleys 44 corresponding thereto.

  Therefore, a plurality of guide plates 32 and a conveyor belt 46 having a predetermined length in the conveyance direction (arrow A direction) are alternately arranged in the width direction to constitute a conveyance nipping unit 48, and further this conveyance nipping unit 48. Are arranged above and below the center line C. Then, when the driving pulley 36 is rotated by receiving the rotational driving force of the conveyor driving motor 38, the conveying belt 46 also circulates in the direction in which the laminated bundle 16 can be conveyed (arrow D direction) correspondingly.

  The opposing surfaces (surfaces on the center line C side) of the upper and lower auxiliary plates 42 and 42 are parallel to each other along the transport direction (the direction of arrow A). A portion where the conveyance belt 46 is in contact with the auxiliary plate 42 is a conveyance portion, and is supported from the inside by the auxiliary plate 42, so that flatness is maintained. For example, even when the transport belt 46 is transporting while supporting the laminated bundle 16, it is not inadvertently bent due to the weight of the laminated bundle 16. Further, the position of the conveying portion of the conveying belt 46 is set so as to be between the approach position (see FIG. 8 or 9) of the support plate 26 and the separated position (see FIG. 1 or 4).

  A position sensor (not shown) is attached to the frame body 24, and the stacked bundle 16 has a predetermined inverted position (the position shown in FIG. 8, the stacked bundle 16 at the inverted position in FIG. 2 is indicated by a two-dot chain line. ) Is sent to the control device.

  As shown in FIGS. 2 and 3, a reversing motor 50 that is driven and controlled by a control device is attached to the outside of one frame 18. The rotational driving force of the reversing motor 50 is transmitted to the frame body 24 via a driving force transmission member 52 such as a driving belt. When the frame body 24 rotates, the conveyance and clamping unit 48 is reversed. The top and bottom are switched.

  An angle sensor 54 for detecting the rotation angle of the frame body 24 is attached to the outside of the other frame 18 and connected to the control device. The control device drives the reversing motor 50 based on the information from the angle sensor 54. The reversing motor 50 is rotatable in two forward and reverse directions, and the frame body 24 also rotates in the two forward and reverse directions around the center line C.

  Next, a planographic printing plate, a slip sheet, etc. constituting the laminated bundle 16 will be described. The lithographic printing plate is coated on a thin aluminum support formed in a rectangular plate shape with a coating film (a photosensitive layer in the case of a photosensitive printing plate, a thermal layer in the case of a thermal printing plate, and further necessary. Accordingly, an overcoat layer, a mat layer, or the like is applied. The coating film is subjected to plate making processes such as exposure, development, and gumming, set in a printing machine, and ink is applied to print characters, images, and the like on the paper. Note that the planographic printing plate of the present embodiment is a stage before processing (exposure, development, etc.) necessary for printing, and is sometimes referred to as a planographic printing plate precursor or a planographic printing plate material. There is also.

  As long as it is configured as described above, the specific configuration of the lithographic printing plate is not particularly limited. For example, by using a lithographic printing plate for a laser printing plate of a heat mode method and a photon method, A lithographic printing plate capable of direct plate making can be obtained.

Further, the lithographic printing plate can be adapted to various plate making methods by selecting various components in the photosensitive layer or the heat sensitive layer. Examples of specific embodiments of the lithographic printing plate applied to the present invention include the following embodiments (1) to (11).
(1) An embodiment in which the photosensitive layer contains an infrared absorber, a compound that generates an acid by heat, and a compound that crosslinks by an acid.
(2) A mode in which the photosensitive layer contains an infrared absorber and a compound that becomes alkali-soluble by heat.
(3) A mode in which the photosensitive layer includes two layers of a compound that generates radicals upon irradiation with laser light, a layer containing an alkali-soluble binder, and a polyfunctional monomer or prepolymer, and an oxygen blocking layer.
(4) A mode in which the photosensitive layer is composed of two layers of a physical development nucleus layer and a silver halide emulsion layer.
(5) A mode in which the photosensitive layer includes three layers of a polymerization layer containing a polyfunctional monomer and a polyfunctional binder, a layer containing silver halide and a reducing agent, and an oxygen blocking layer.
(6) A mode in which the photosensitive layer includes two layers of a layer containing a novolak resin and naphthoquinone diazide and a layer containing silver halide.
(7) A mode in which the photosensitive layer contains an organic photoconductor.
(8) A mode in which the photosensitive layer includes 2-3 layers composed of a laser light absorbing layer removed by laser light irradiation, and a lipophilic layer and / or a hydrophilic layer.
(9) A compound in which the photosensitive layer absorbs energy to generate an acid, a polymer compound having a functional group that generates sulfonic acid or carboxylic acid by an acid in the side chain, and an acid generator by absorbing visible light The aspect containing the compound which gives energy to.
(10) A mode in which the photosensitive layer contains a quinonediazide compound and a novolac resin.
(11) A mode in which the photosensitive layer contains a compound that decomposes by light or ultraviolet rays to form a crosslinked structure with itself or other molecules in the layer and an alkali-soluble binder.

  In particular, in recent years, lithographic printing plates coated with a high-sensitivity photosensitive type coating film that is exposed by a laser, and thermal type lithographic printing plates may be used (for example, the above-described (1) to (3)). In the case of such a high-sensitivity type lithographic printing plate, it is preferable to use a laminated bundle reversing device applied to the present invention.

In addition, the wavelength of the laser beam here is not particularly limited, and examples thereof include the following (A) to (E).
(A) A laser having a wavelength range of 350 to 450 nm. As a specific example, a laser diode having a wavelength of 405 ± 5 nm.
(B) A laser having a wavelength range of 480 to 540 nm. Specific examples include an argon laser having a wavelength of 488 nm, a (FD) YAG laser having a wavelength of 532 nm, a solid-state laser having a wavelength of 532 nm, and a (green) He—Ne laser having a wavelength of 532 nm.
(C) A laser having a wavelength range of 630 to 680 nm. Specific examples include a He—Ne laser having a wavelength of 630 to 670 nm and a red semiconductor laser having a wavelength of 630 to 670 nm.
(D) A laser having a wavelength region of 800 to 830 nm. As a specific example, an infrared (semiconductor) laser having a wavelength of 830 nm.
(E) A laser having a wavelength of 1064 to 1080 nm. A specific example is a YAG laser with a wavelength of 1064 nm.

  Among these, for example, the laser beams in the wavelength ranges of (B) and (C) can be applied to both lithographic printing plates having the photosensitive layer or the heat-sensitive layer of the above-described aspect (3) or (4). It is. Further, the laser light in the wavelength range of (D) and (E) can be applied to both the lithographic printing plate having the photosensitive layer or the heat-sensitive layer of the above-described aspect (1) or (2). However, the relationship between the wavelength range of the laser beam and the photosensitive layer or the heat-sensitive layer is not limited to these.

  The lithographic printing plate of this embodiment (the lithographic printing plate of all aspects (1) to (11) described above) is an automatic plate making machine having an automatic plate feeding function in a state where the laminated bundle 16 is configured, or a so-called plate. It is a lithographic printing plate that is set on a setter or the like and may be supplied (plate feeding) to the plate making process. However, in the actual usage situation, the user of the lithographic printing plate is not affected by how the lithographic printing plate is fed by an automatic plate feeding mechanism or manually fed (in other words, the feeding As a problem before the plate method), the laminated bundle 16 can be reversed using the laminated bundle reversing device 10 of the present embodiment. Further, even if the lithographic printing plate has a form other than (1) to (11), it is set in an automatic plate making machine having an automatic plate feeding function or a so-called plate setter, and supplied (plate feeding) to the plate making process. All the lithographic printing plates that may be included are included in the lithographic printing plate according to the present embodiment.

  Furthermore, some of the lithographic printing plates are so-called “discarded plates” or “empty plates” that are set and used at positions where ink is not applied (that is, areas that are not printed) for the convenience of the paper, depending on the printing machine used. Some are called. Such a discarded plate or an empty plate is also included in the planographic printing plate applied to this embodiment.

  The shape or the like of the lithographic printing plate is not particularly limited, and for example, on one side or both sides of an aluminum plate having a thickness of 0.1 to 0.5 mm, a long side (width) of 300 to 2050 mm, and a short side (length) of 200 to 1500 mm. A coating film (photosensitive layer or heat-sensitive layer) may be applied.

  The laminated bundle 16 is configured by alternately stacking the slip sheets for protecting the coating film and the planographic printing plate in the thickness direction. It is possible to prevent deformation and damage of the lithographic printing plate by arranging a protective sheet (a protective cardboard generally referred to as a “contact ball”) for each end face in the overlapping direction or for every predetermined number of lithographic printing plates. You may do it.

  The number of lithographic printing plates constituting one laminated bundle 16 is not particularly limited, but may be 10 to 200, for example, from the viewpoint of efficient transportation and storage. By using 10 or more lithographic printing plates, the handling efficiency can be improved. In addition, when the number of planographic printing plates is 200 or less, the weight of the stacked bundle 16 itself is limited, so that the work load in handling the load is reduced.

  It is also possible to configure the laminated bundle 16 with a larger number of planographic printing plates so that it can be transported and stored more efficiently (with a smaller number of times of handling). For example, the maximum number of planographic printing plates may be about 3000. Depending on the type of the lithographic printing plate, one or both of the interleaving paper and the protective cardboard may be omitted to constitute the laminated bundle 16 of the lithographic printing plate.

The interleaf is not particularly limited as long as the coating film (image forming surface) of the lithographic printing plate can be protected. For example, paper using 100% wood pulp, synthetic pulp without using 100% wood pulp And paper having a low-density polyethylene layer on the surface of these papers. In particular, a paper that does not use synthetic pulp has a low material cost, so that a slip sheet can be produced at a low cost. More specifically, interleaving paper having a basis weight of 30 to 60 g / m ² , a density of 0.7 to 0.85 g / cm ³ , a moisture content of 4 to 8%, and a pH of 4 to 6 made from bleached kraft pulp can be mentioned. However, the specific configuration of the slip sheet is not limited to this.

  Next, a description will be given of a method of fixing the portion by hanging an adhesive tape over and under the edge of the laminated bundle 16, which is a characteristic part of the present invention. FIG. 5 is a conceptual diagram illustrating this method. FIG. 4A is a perspective view of the laminated bundle 16, and FIG. 4B is a side view of FIG. In FIG. 5, the adhesive tape 15 is stretched over and under the edge of the laminated bundle 16 and the portion is fixed. The fixing points with the adhesive tape 15 are two long sides of the laminated bundle 16 respectively.

  At this time, an adhesive tape 15 cut to a required length is prepared, first, the adhesive tape 15 is bonded to one side (for example, the back surface 12B) of the laminated bundle 16, and then the adhesive tape 15 of the unbonded portion is pulled. A method of adhering to the end surface 16C of the laminated bundle 16 and then adhering to the other surface (for example, the surface 16A) of the laminated bundle 16 while pulling the adhesive tape 15 of the non-adhered portion is preferable. By adopting such a method, a local compressive force is applied to the laminated bundle 16 of the bonded portion, and the adhesive tape 15 is adhered to the end surface 16C of the laminated bundle 16, and the effects of both are combined. , No bundle deviation occurs during the reversal.

  The adhesive tape 15 used here is required not to have a chemical effect on the photosensitive layer of the lithographic printing plate and to cause no image defects due to dust caused by the remaining adhesive. As long as this condition is satisfied, the material and size of the adhesive tape 15 are not particularly limited, and an appropriate material and size can be selected according to the size and weight of the laminated bundle 16 and the number of laminated lithographic printing plates. For example, various materials can be selected such as rubber or acrylic as the paste material, and paper, cloth, plastic or the like as the support.

  The adhesive strength of the adhesive tape 15 is preferably 4.4 N / cm or less in a peeling test (180 degree peeling) according to JIS Z0237. The basis for this will be described. The adhesive tape 15 is preferably a packaging craft tape that is generally used in terms of cost. However, such packaging kraft tape is liable to have adhesive residue. Therefore, a search was made for conditions under which glue residue does not occur.

  The adhesive tape 15 was prepared by changing the amount of glue applied to the support by several conditions, and this adhesive tape 15 was adhered to the laminated bundle 16. The sample was left in a temperature-controlled room at a temperature of 45 ° C. and a relative humidity of 75% for 1 week, and then the adhesive tape 15 was peeled off from the laminated bundle 16 and the remaining glue was visually observed.

In the sample using the adhesive tape 15 in which the amount of paste applied was 120 g / m ² or more, the residue of the paste was observed. The adhesive strength of the adhesive tape 15 having a glue application amount of 120 g / m ² was 5.0 N. On the other hand, the adhesive residue was not observed in the sample with the adhesive tape 15 having an adhesive application amount of 80 g / m ² or less. The adhesive strength of the adhesive tape 15 having an adhesive application amount of 80 g / m ² was 4.4 N.

  As such a preferred adhesive tape 15, for example, Kikusui's craft tape, trade name: 111-PS can be used.

Moreover, the inversion test of the laminated bundle 16 was performed using the adhesive tape 15 having such characteristics, and the minimum required adhesion area of the adhesive tape 15 to the laminated bundle 16 was obtained. Although it depends on the size, weight, etc. of the laminated bundle 16, it was confirmed that the area of the current laminated bundle 16 is sufficient if the adhesive area of the adhesive tape 15 to the laminated bundle 16 is 100 cm ² or more.

  The fixing with the adhesive tape 15 may be an automatic method using an apparatus or a manual operation of an operator.

  The laminated bundle 16 fixed by the adhesive tape 15 is sandwiched by the above-described laminated bundle reversing device 10 in the lamination direction, and the pressure shown by the arrow P in FIG. Is inverted. FIG. 6 is a conceptual diagram showing this state. FIG. 6A shows a state in which the stack 16 is rotated 90 degrees and stands upright, and FIG. 6B is rotated 180 degrees and inverted. The front surface 16A is on the bottom and the back surface 16B is on the top. For convenience of explanation, illustration of the laminated bundle reversing device 10 is omitted.

  FIG. 7 is a conceptual diagram showing each aspect of fixing the adhesive tape 15 to the end side of the laminated bundle 16. FIG. 4A shows an aspect in which the adhesive tape 15 having a narrow width is fixed at two locations on one long side of the laminated bundle 16, and FIG. 4B shows the two long sides of the laminated bundle 16. A wide adhesive tape 15 is fixed to each one of the two, and FIG. 2C shows a slightly wider adhesive tape 15 fixed to one of the two short sides of the laminated bundle 16. FIG. 4D is a mode in which a narrow adhesive tape 15 is fixed to each of two short sides of the laminated bundle 16, and FIG. 4E shows the laminated bundle 16. This is a mode in which a wide adhesive tape 15 is fixed to each one of the two long sides, and a slightly wider adhesive tape 15 is fixed to each one of the two short sides. f), the adhesive tape 15 having a narrow width is fixed to each of the two long sides of the laminated bundle 16, and the short side 2 Of a manner narrow adhesive tape 15 having a width is fixed to each of two locations.

  Next, a method for inverting the laminated bundle 16 by the laminated bundle inverting device 10 will be described. In the laminated bundle reversing device 10, in a normal state, as shown in FIGS. 3 and 4, the guide plates 32 are at positions separated from each other and at positions away from the conveying portion of the conveying belt 46.

  First, in the state shown in FIG. 4, the transport conveyor 12 on the upstream side of the processing line is driven to transport the stack 16. Along with this, the conveyor drive motor 38 (see FIG. 1) is driven, and the conveyor belt 46 is driven in synchronization. As a result, the laminated bundle 16 is conveyed to the reversal position of the laminated bundle reversing device 10 by the lower conveyance belt 46. At this time, the conveyance speed of the laminated bundle reversing device 10 does not decrease, and the conveyance of the laminated bundle reversing device 10 does not stop.

  When the laminated bundle 16 is conveyed to the reverse position by the lower conveying belt 46, a position sensor (not shown) detects the laminated bundle 16 and sends this information to the control device. In response to this information, the control device stops the drive of the conveyor drive motor 38. Thereby, the laminated bundle 16 stops at the reversal position of the laminated bundle reversing device 10.

  Next, the nip cylinders 28 and 28 are driven, and the support plates 26 and 26 approach each other. As a result, as shown in FIG. 8, the stack 16 is lifted by the lower support plate 26 and lifted from the conveyor belt 46, and is sandwiched between the upper and lower guide plates 32 and 32 in the stacking direction. Since the driving of the nip cylinders 28 and 28 is stopped while the laminated bundle 16 is sandwiched, there is no problem that the laminated bundle 16 is excessively sandwiched in the thickness direction, and there is a problem in the quality of the lithographic printing plate. It does not occur.

  Next, the reversing motor 50 is driven (forward rotation), and the frame body 24 rotates around the center line C. When the rotation angle of the frame 24 reaches 180 degrees, the angle sensor 54 detects this, and in response to this, the driving of the reversing motor 50 is stopped. This state is shown in FIG. That is, the conveying and clamping unit 48 is inverted and the upper and lower surfaces are switched. The laminated bundle 16 sandwiched between the guide plates 32 is also reversed.

  Next, the nip cylinders 28 and 28 are driven, and the support plates 26 and 26 are separated from each other. Thereby, the sandwiching of the laminated bundle 16 is released, and the laminated bundle 16 is supported on the conveying belt 46 on the lower side. In this state, the conveyor drive motor 38 is driven, and the conveyor belt 46 circulates. Thereby, the laminated bundle 16 reversed is conveyed to the conveyance conveyor 14 on the downstream side of the processing line. This completes the reversal of the stack 16.

  Note that the frame 24 need not be rotated when the next stack 16 is reversed. That is, the stacked bundle 16 may be received and inverted between the upper and lower conveying and clamping units 48 and 48 without rotating the frame 24 and returning to the initial state.

  As mentioned above, although the example of embodiment of the lamination | stacking bundle inversion method based on this invention was demonstrated, this invention is not limited to the example of the said embodiment, Various aspects can be taken.

  For example, instead of the conveyance belt 46 of the laminated bundle reversing device 10 of the embodiment, an apparatus having a configuration in which a conveyor roll is used can also be applied.

  Further, as the method for fixing the laminated bundle 16 with the adhesive tape 15, various modes other than those illustrated in FIG. 7 can be adopted.

  As described above, according to the present invention, before reversing the laminated bundle, the adhesive tape having a predetermined width is stretched over at least one place on at least one end of the laminated bundle to fix the place. As a result, even if the stacked bundle is sandwiched with a pressure that does not cause so-called “fogging”, the bundle does not shift during reversal. As a result, yield and productivity can be improved, and integrated machining is also possible.

  A reversal experiment of the laminated bundle 16 was performed using the laminated bundle reversing apparatus 10 described above. A PS plate having a thickness of 0.24 mm and a size of 1030 × 800 mm (manufactured by FUJIFILM Corporation, product name: LH-P1) was used as a lithographic printing plate. As for the configuration of the laminated bundle 16, 30 sheets were laminated via interleaf paper so that the printing surface of the planographic printing plate was the upper surface. Then, thick paper having the same size as the planographic printing plate and a thickness of 0.8 mm was provided as protective sheets on the upper and lower surfaces of the laminate. A plurality of the laminated bundles 16 were prepared.

  As the adhesive tape 15, craft tape manufactured by Kikusui Co., Ltd., trade name: 111-PS was used. The laminated bundle 16 was fixed by cutting the adhesive tape 15 to have a width of 25 mm and a length of a predetermined area. The mode of fixing the adhesive tape 15 is the state shown in FIG. 7A, and the position is 100 mm from the end of the long side (side of 1030 mm) of the laminated bundle 16.

  As a comparative example, a laminated bundle 16 that was not fixed by the adhesive tape 15 was prepared.

  These laminated bundles 16 were reversed by the laminated bundle reversing device 10 to evaluate whether or not “fogging” occurred in the lithographic printing plate, and the bundle deviation at the time of reversal. Moreover, the clamping pressure by the laminated bundle reversing device 10 was also changed in the range of 800 to 2000 Pa.

  FIG. 10 is a table showing inversion conditions and evaluation results of Examples and Comparative Examples. Among them, Examples 1, 5 and 9 are samples that are not fixed by the adhesive tape 15, and Examples 2 to 4, Examples 6 to 8, and Examples 10 to 12 are samples fixed by the adhesive tape 15. is there. In the sample fixed by the adhesive tape 15, the adhesion area (tape area) is changed into three types.

  In Examples 1 to 4 in which the clamping pressure was 2000 Pa, no bundle shift occurred regardless of whether the adhesive tape 15 was fixed or not, but “fogging” occurred in all cases. That is, it is estimated that the clamping pressure was in an excessive state.

In nip pressure Example 5 Example was 1000 Pa 8, no examples 5 and the tape area of fixing by adhesive tape 15 is caused to bundle deviation Example 6 of 10 cm ^2, the tape area examples 7 and the tape area of 35 cm ² 100 cm ^In Example 8 of ² , no bundle deviation occurred. Moreover, “fogging” did not occur in any of Examples 5 to 8. That is, it is estimated that the clamping pressure was in an appropriate state for the present invention.

In Examples 9 to 12 were the nip pressure to 800 Pa, no examples 9 and the tape area of fixing by adhesive tape 15 is caused to bundle deviation Example 10 of 10 cm ^2, the tape area is Example 11 and the tape area of 35 cm ² 100 cm ^In Example 12 of ² , no bundle deviation occurred. Moreover, “fogging” did not occur in any of Examples 9 to 12. That is, it is estimated that the clamping pressure was in an appropriate state for the present invention.

The side view which shows the lamination | stacking bundle inversion apparatus used for embodiment of this invention The top view which shows a partially broken laminate bundle reversing device used for an embodiment of the present invention The front view which shows the lamination | stacking bundle inversion apparatus used for embodiment of this invention Sectional view along line 4-4 in FIG. Conceptual diagram of the method of spanning and fixing the adhesive tape on the edge of the stack Conceptual diagram showing the state in which the stack is reversed Conceptual diagram showing each mode for fixing the adhesive tape to the edge of the laminated bundle Explanatory drawing which shows the process of reversing a laminated bundle in a laminated bundle inversion apparatus Explanatory drawing which shows the process of reversing a laminated bundle in a laminated bundle inversion apparatus Table showing evaluation results of examples

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Laminated bundle inversion apparatus, 12, 14 ... Conveyor, 15 ... Adhesive tape, 16 ... Laminated bundle, 22 ... Apparatus main body, 48 ... Conveyance clamping unit

Claims (5)

A laminated bundle reversing method for reversing a laminated bundle in which a plurality of plate-like materials are laminated by a reversing means,
A step of conveying the laminated bundle to a predetermined reverse position by a conveying means;
Spanning an adhesive tape having a predetermined width above and below at least one place on at least one end of the laminated bundle, and fixing the place;
Sandwiching the transported stack in the stacking direction with a sandwiching member of the reversing means;
Reversing the sandwiched bundle with a reversing member of the reversing means;
A laminate bundle reversal method comprising: The adhesive strength of the adhesive tape is 4.4 N / cm or less in a peel test according to JIS Z0237, and the adhesive area of the adhesive tape to the laminated bundle is 100 cm ² or more. Method for reversing the laminated bundle.   The method for reversing a laminated bundle according to claim 1 or 2, wherein, in the reversing step, the reversal is performed so that an end of the adhesive tape is positioned on a lower side.   The laminated bundle inversion method according to any one of claims 1 to 3, wherein protective sheets are disposed on the uppermost layer and the lowermost layer of the laminated bundle. The inversion means is
A sandwiching member for sandwiching the stack of bundles transported by the transport means and stopped at a predetermined reversal position;
A reversing member for reversing the clamping member;
The laminate bundle inversion method according to any one of claims 1 to 4, wherein:

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