JP5438594B2 - Gravure offset printing machine - Google Patents

Description

  The present invention relates to a gravure offset printing machine using a blanket formed of a material having a low surface energy, such as silicone, which is suitable for performing high-definition printing with a thick film and having good releasability.

  As a conventional gravure printing machine, a gravure plate cylinder in which concave portions for filling an ink and forming an image line portion are provided on the peripheral surface, and an ink supply means for supplying ink to the peripheral surface of the gravure plate cylinder, The gravure plate cylinder and an impression cylinder facing each other's peripheral surface and supplying the printed material between the respective peripheral surfaces, and transferring the ink filled in the concave portion of the gravure plate cylinder to the printed material (For example, refer to Patent Document 1).

  In the gravure printing machine described in Patent Document 1, a printing material enters a recess for forming an image line portion of the gravure plate cylinder at a position where the gravure plate cylinder and the impression cylinder face each other. The ink is transferred to the substrate by taking the ink. However, in the conventional gravure printing machine as described above, there is variation in the transfer of ink to the printing material due to the material of the printing material, the viscosity of the ink, etc., and the ink filled in the recesses of the gravure plate cylinder is gravure. There has been a transfer defect in which a necessary amount is not necessarily transferred onto the printing material supplied between the plate cylinder and the impression cylinder. In particular, when the printed material is formed of a relatively hard material such as an insulating substrate, glass, or metal plate, the amount of the printed material that enters the concave portion of the gravure plate cylinder is reduced, so that the transfer defect becomes more prominent. There is a problem of becoming. In order to solve this problem, by inserting a blanket cylinder between the gravure plate cylinder and the impression cylinder, the blanket is firmly transferred into the plate surface, so that the blanket is securely transferred from the plate surface, and the ink Can be transferred to a substrate. Furthermore, if silicone is used as the blanket material, ink bleeding on the blanket can be suppressed and ink remaining on the blanket can be prevented, so that high-definition printing is possible.

Japanese Patent Application Laid-Open No. 07-24990

  In the gravure offset printing machine as described above, the transfer of ink from the blanket cylinder to the printing material is improved by adopting the silicone blanket cylinder, but the gravure due to the property that the ink hardly adheres to the silicone. Ink delivery from the plate cylinder to the blanket cylinder is poor. In order to improve this, in order to lengthen the ink transfer time in the blanket cylinder, the ink is transferred from the blanket cylinder to the substrate by slowing the rotation speed of the blanket cylinder to reduce the ink transfer speed to the blanket cylinder. The transfer speed is also slowed down. In order to make the transfer from the blanket cylinder 100% by taking advantage of the releasability of silicone, it is said that the transfer speed should be faster than the delivery speed, but if you intend to perform gravure offset printing by roll-to-roll continuous printing There is a problem that a speed difference cannot be made between the delivery speed and the transfer speed.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a gravure offset printing machine capable of performing high-definition printing with a thick film after performing continuous printing.

  In order to achieve this object, the present invention provides a gravure printing cylinder in which a concave portion filled with ink is provided on the peripheral surface, a blanket in which ink is transferred from the concave portion of the gravure printing cylinder, and ink from the blanket. In a gravure offset printing press provided with a substrate to be transferred, the blanket is an endless belt made of a material having a low surface energy, and the gravure plate cylinder is a belt that contacts while rotating, and the belt is stretched. A plurality of rollers for traveling are provided, and the gravure plate cylinder is caused to travel at a speed slower than the traveling speed of the blanket in the traveling direction of the blanket.

  The present invention provides a plurality of gravure printing cylinders according to the invention, and of the plurality of gravure printing cylinders, of the plurality of gravure printing cylinders, the next gravure printing cylinder before the completion of ink transfer to the blanket of the preceding gravure printing cylinder Ink delivery to the blanket is started, and the preceding gravure plate cylinder from which ink delivery has been completed is sequentially returned to the travel start position.

  According to the present invention, in any one of the inventions, a speed obtained by adding a traveling speed and a rotational speed of the gravure plate cylinder is the same as a traveling speed of the blanket, and a supply speed of the printing material is the blanket. It is the same as the traveling speed.

  According to the present invention, after performing continuous printing by roll-to-roll, by making the transfer speed faster than the delivery speed, 100% from the blanket to the printed material by utilizing the releasability of the material with low surface energy. The ink can be transferred. In addition, since the ink transfer time is increased by relatively slowing the speed of ink transfer from the gravure plate cylinder to the blanket, the amount of ink that the blanket receives from the gravure plate cylinder can be increased. Therefore, since a defect of a blanket formed of a material having a characteristic that ink is difficult to adhere and low surface energy can be compensated, a predetermined amount of ink can be delivered to the blanket. For this reason, since the blanket is made of a material having good releasability, a sufficient amount of ink can be reliably transferred from the blanket to the printing material, enabling high-definition printing with a thick film. Become. In particular, even when a high-definition wiring pattern is formed on a printed wiring board with ink, disconnection and line width do not decrease.

  According to one of the inventions, ink can be simultaneously transferred from a plurality of gravure printing cylinders to the blanket. It is possible to reduce an area where printing is not possible in the printed matter. In addition, while the gravure plate cylinder is returned to the travel start position, ink can be transferred from the other gravure plate cylinder to the blanket, so that printing can be efficiently performed on the substrate.

  When ink is transferred from the gravure plate cylinder to the blanket, there is no slip between the peripheral surface of the gravure plate cylinder and the surface of the blanket. High-definition printing can be performed because it is delivered to the blanket while maintaining the shape as it is.

It is a side view which shows the principal part of the gravure printing machine which concerns on this invention, The same figure (A) shows the state from which the delivery of the ink from a gravure printing cylinder to a blanket was started, The same figure (B) is from a gravure printing cylinder. The state where the ink delivery to the blanket has been completed is shown, and FIG. 9C shows the state where the ink is transferred from the blanket to the substrate. It is a side view which shows the principal part in the 2nd Embodiment of this invention, and shows the state which the delivery of the ink from the 1st gravure printing cylinder to the blanket was completed, The figure (B) is the 1st gravure. The state where the plate cylinder is lifted is shown, and FIG. 10C shows the state where the first gravure plate cylinder is returned to the travel start position. It is a side view which shows the principal part in the 2nd Embodiment of this invention, The figure (A) shows the state which the 2nd gravure printing cylinder was lifted, The figure (B) shows the 2nd gravure. The state where the plate cylinder is returned to the travel start position is shown, and FIG. 10C shows the state where the third gravure plate cylinder is separated from the blanket.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
[Embodiment 1]

  First, a first embodiment of the present invention will be described with reference to FIG. A reference numeral 1 in FIG. 1 is a blanket formed of a silicone belt having a characteristic of low surface energy, and is stretched between the driving roller 2 and the driven roller 3. 2 rotates in the clockwise direction in the figure by a drive source (not shown), so that the blanket 1 travels in the direction of arrow A at a speed V1. Reference numeral 4 denotes a flat base that slides while supporting the blanket 1, and is provided between the driving roller 2 and the driven roller 3, and the upper surface 4 a and the blanket 1 are in close contact so that there is no gap.

Reference numeral 5 denotes a gravure plate cylinder provided with a concave portion 5a filled with ink containing silver paste on the peripheral surface. The ink 6 supplied to the peripheral surface from an ink supply device (not shown) is a doctor blade 7 As a result, the recess 5a is filled, and excess ink adhering to the peripheral surface is scraped off. The gravure plate cylinder 5 is in contact with the blanket 1 at its peripheral surface, and travels at a speed V2 in the direction of arrow A while maintaining the contacted state. It is rotating at V3. And V2 and V3 are
V2 = 1 / 2V1, V3 = 1 / 2V1
Is set to

Here, the transfer speed V for transferring ink from the gravure plate cylinder 5 to the blanket 1 is the reciprocal of the time from when the ink is transferred from the gravure plate cylinder 5 until the transfer is completed. In other words, the delivery speed V is
V = V1-V2 = V1-1 / 2V1 = 1 / 2V1.

  Accordingly, if the gravure plate cylinder 5 is stopped without traveling in the direction of arrow A, the delivery speed V is the travel speed V1 of the blanket 1, and in comparison with this, the ink delivery is performed in the present invention. The speed is halved. This means that the ink delivery time from the gravure plate cylinder 5 to the blanket 1 is doubled.

  Reference numeral 8 denotes a pressure drum facing the driven roller 3, and a printed material 9 that travels at a speed V in the direction of arrow B is supplied between the blanket 1 and the pressure drum 8 that are stretched around the driven roller 3. Ink 9 is transferred from the blanket 1. In this case, the driven roller 3 is stopped without traveling in the direction of the arrow B, which is the traveling direction of the substrate 8, so that the transfer speed of the ink from the blanket 1 of the substrate 9 is the traveling of the substrate 9. This corresponds to the speed V, and is twice the ink transfer speed from the gravure plate cylinder 5 to the blanket 1 described above. In other words, the ink transfer time from the blanket 1 to the substrate 9 is half of the ink transfer time from the gravure plate cylinder 5 to the blanket 1.

  Next, the printing operation of the gravure offset printing machine configured as described above will be described. The ink 6 supplied from the ink supply device (not shown) to the peripheral surface of the gravure plate cylinder 5 is filled into the recess 5a by the doctor blade 7 as shown in FIG. Excess ink adhering to the peripheral surface is scraped off.

  The ink 6 filled in the recess 5a starts to be transferred to the blanket 1 at point C, and is transferred from the gravure plate cylinder 5 to the blanket 1. At this time, since the gravure plate cylinder 5 travels in the direction of arrow A at a speed of 1/2 V1, the transfer time of the ink 6 to the blanket 1 stops as described above without the gravure plate cylinder 5 traveling. It is twice as compared with the case where it is. Therefore, since the defect of the silicone blanket 1 having the characteristic that ink is difficult to adhere can be compensated, a predetermined amount of ink can be delivered to the blanket 1. For this reason, since the blanket 1 is formed of silicone with good releasability, a sufficient amount of ink can be reliably transferred from the blanket 1 to the substrate 9, so that a thick film and high-definition printing can be performed. Is possible. In particular, even when a high-definition wiring pattern is formed on a printed wiring board using ink, disconnection does not occur or the line width does not become narrow.

  Further, when the blanket 1 and the gravure plate cylinder 5 travel in the direction of arrow A, the ink 6 filled in the recess 5a is sequentially transferred to the blanket 1 as shown in FIG. Here, since the traveling speed V2 of the gravure plate cylinder 5 is set to 1/2 V1 and the rotational speed V3 is set to 1/2 V1, the speed in the direction of arrow A of the recess 5a in contact with the blanket 1 is It becomes V1 obtained by adding the traveling speed 1 / 2V1 and the rotational speed 1 / 2V1 of the gravure plate cylinder 5, and is the same speed as the speed V1 of the blanket 1 in the arrow A direction. Therefore, when the ink 6 is transferred from the concave portion 5a to the blanket 1, the ink does not slip between the concave portion 5a and the blanket 1, that is, slip does not occur. Passed to blanket 1 while keeping.

Furthermore, when the blanket 1 travels in the direction of arrow A, ink is transferred from the blanket 1 to the substrate 9 as shown in FIG. As described above, since the blanket 1 is formed of silicone with good releasability that easily releases ink, a sufficient amount of ink is reliably transferred to the substrate 9, so that the printing quality is improved. In addition, since the ink transfer time to the printing material 9 is half of the ink transfer time to the blanket 1, the ink of the blanket 1 is transferred to the printing material 9 while maintaining its shape, and high-definition Printing can be performed. In this way, by performing continuous printing by roll-to-roll and making the transfer speed faster than the delivery speed, 100% transfer from the blanket becomes possible by taking advantage of the releasability of materials with low surface energy. High-definition printing becomes possible.
[Embodiment 2]

  Next, a second embodiment of the present invention will be described with reference to FIGS.

  In the second embodiment, three first to third gravure plate cylinders 5A to 5C are provided at equal intervals in the running direction of the blanket 1, and the three first to third gravure plate cylinders are provided. 5A to 5C are traveling at the same speed in the arrow A direction at a speed 1 / 2V1 with respect to the traveling speed V1 of the blanket 1. Of these three first to third gravure printing cylinders 5A to 5C, before the ink transfer to the blanket 1 of the preceding gravure printing cylinder 5A is completed, the blanket of the next gravure printing cylinder 5B has already been completed. Ink delivery to 1 has started, and at least two of the three first to third gravure printing cylinders 5A to 5C simultaneously deliver ink to the blanket 1. It is configured. Furthermore, the ink is returned to the running start position sequentially from the preceding gravure plate cylinder 5A after the ink delivery is completed, and the ink is delivered to the blanket 1 by the other gravure plate cylinders 5B and 5C during the return. is there.

  That is, as shown in FIG. 2A, when the ink 6A filled in all the concave portions 5a of the preceding first gravure plate cylinder 5A is delivered to the blanket 1, before the delivery is completed. The transfer of the ink 6B already filled in a part of the recess 5a of the second gravure plate cylinder 5B to the blanket 1 has already started, and the recess 5a of the third gravure plate cylinder 5C has started. Delivery of the filled ink 6C to the blanket 1 is started.

  The first gravure plate cylinder 5A after the delivery of the ink 6A filled in all the recesses 5a to the blanket 1 has been lifted by a conveyance chain (not shown) as shown in FIG. , And moved in the direction of arrow C.

  Next, as shown in FIG. 5C, when the transfer of the ink 6B filled in all the concave portions 5a of the preceding second gravure plate cylinder 5B to the blanket 1 is completed, the transfer is completed. In addition, the delivery of the ink 6C already filled in a part of the recess 5a of the next third gravure plate cylinder 5C to the blanket 1 has already started, and the first has returned to the travel start position by the transport chain. The transfer of the ink 6A filled in the recess 5a of the gravure plate cylinder 5A to the blanket 1 is started.

  The second gravure plate cylinder 5B after the ink 6B filled in all the recesses 5a to the blanket 1 has been lifted by a conveyance chain (not shown) as shown in FIG. , And moved in the direction of arrow C.

  Next, as shown in FIG. 5B, when the delivery of the ink 6C filled in all the recesses 5a of the preceding third gravure plate cylinder 5C to the blanket 1 is completed, before the delivery is finished. In addition, the transfer of the ink 6A already filled in a part of the recess 5a of the next first gravure plate cylinder 5A to the blanket 1 has already started, and the second has returned to the travel start position by the transport chain. The transfer of the ink 6B filled in the recess 5a of the gravure plate cylinder 5B to the blanket 1 is started.

  After the transfer of the ink 6C filled in all the recesses 5a to the blanket 1 is finished, the third gravure plate cylinder 5C is lifted by a conveyance chain (not shown) as shown in FIG. , And moved in the direction of arrow C.

  In this way, three first to third gravure plate cylinders 5A to 5C are provided side by side in the running direction of the blanket 1, and among these three gravure plate cylinders 5A to 5C, the blanket 1 of the preceding gravure plate cylinder is provided. Before the ink is delivered to the blanket 1, ink delivery to the blanket 1 of the next gravure plate cylinder is started, so that the ink is received from the three gravure plate cylinders 5A to 5C simultaneously to the blanket 1. Since it can be handed over, as in the case of only one gravure plate cylinder, it is possible to reduce an area where printing cannot be performed on the substrate 9 that is generated when one gravure plate cylinder travels.

  In addition, while one gravure plate cylinder is returned to the travel start position, ink is transferred from the other gravure plate cylinder to the blanket 1, so printing can be efficiently performed on the substrate.

  In the present embodiment, the traveling speed of the gravure printing cylinders 5, 5A, 5B, 5C is half the traveling speed of the blanket 1, but the gravure printing cylinders 5, 5A, 5B, 5C are not limited to this. 3/4 or 1/3 according to the state of ink transfer from the blanket 1 to the blanket 1. In short, the traveling speed of the gravure plate cylinder 5 may be made slower than the traveling speed of the blanket 1. In the second embodiment, an example in which three gravure printing cylinders are provided has been described. However, the number may be two or four or more corresponding to the entire length of the blanket 1. Further, the blanket 1 is stretched between the two rollers of the driving roller 2 and the driven roller 3, but a roller for adjusting the tension of the blanket 1 may be provided between the driving roller 2 and the driven roller 3. In short, what is necessary is to provide a plurality of rollers that stretch and run the blanket 1.

  In the present embodiment, the blanket 1 is made of silicone, but it is sufficient that at least a portion where ink is transferred from the gravure plate cylinder 5 is formed of silicone, such as a silicone film formed on the surface. . In the present embodiment, the blanket 1 is formed of silicone, but is not limited thereto, and may be formed of PTFE (polytetrafluoroethylene) or PVDF (polyvinylidene fluoride). Any material having low surface energy and good releasability may be used.

  DESCRIPTION OF SYMBOLS 1 ... Blanket, 2 ... Drive roller, 3 ... Driven roller, 5, 5A, 5B, 5C ... Gravure plate cylinder, 5a ... Recessed part, 6, 6A, 6B, 6C ... Ink, 7 ... Doctor blade, 8 ... Impression cylinder, 9: Substrate.

Claims (3)

Gravure offset printing comprising a gravure plate cylinder having a concave portion filled with ink on the peripheral surface, a blanket from which ink is transferred from the concave portion of the gravure plate cylinder, and a substrate to which ink is transferred from the blanket In the machine
The blanket is formed in an endless shape with a material having a low surface energy, and the gravure plate cylinder is a belt that contacts while rotating,
It has a plurality of rollers that stretch and run this belt,
A gravure offset printing machine, wherein the gravure plate cylinder is caused to travel in the blanket traveling direction at a speed slower than the blanket traveling speed.   A plurality of gravure printing cylinders are provided, and among these gravure printing cylinders, the ink is transferred to the blanket of the next gravure printing cylinder before the ink transfer to the blanket of the preceding gravure printing cylinder is completed. 2. The gravure offset printing machine according to claim 1, wherein the gravure offset printing machine is started and returned to the running start position in order from the preceding gravure printing cylinder after the ink delivery is completed.   The speed obtained by adding the traveling speed and the rotational speed of the gravure plate cylinder is the same as the traveling speed of the blanket, and the supply speed of the printing material is the same as the traveling speed of the blanket. Or the gravure offset printing machine of 2.

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