JP2010042554A - Fine printing device equipped with cleaning mechanism for blanket surface - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fine printing device equipped with a cleaning mechanism for a blanket surface, capable of removing uniformly and surely ink remained on a surface of a blanket roll, and capable of maintaining high printing precision over a long period, in the fine printing device for transferring ink supplied to an original plate to a base material via the blanket roll. <P>SOLUTION: This fine printing device for transferring the ink supplied to the original plate to the base material via the blanket roll has the cleaning mechanism for removing the ink remained on the surface of the blanket roll after transferred, and the cleaning mechanism is provided with a cleaning film having a pressure-sensitive adhesive layer on its surface, and a film driving mechanism for moving the cleaning film while bringing its surface into contact with the surface of the blanket roll. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fine printing apparatus for transferring ink supplied to an original plate to a substrate via a blanket roll, and more specifically, a blanket for removing ink remaining on the surface of the blanket roll after transferring the ink to the substrate. The present invention relates to a fine printing apparatus having a surface cleaning mechanism.

When performing fine printing on a substrate such as glass or film, a printing plate (steel gravure roll or the like) made of a material having high hardness is used.
In this case, since the ink supplied to the printing plate cannot be printed as it is on the substrate, a method of transferring the ink supplied to the printing plate to the substrate via a rubber-like sheet called a blanket (offset) Printing method) is used.

As described above, in the offset printing method, the blanket transfers the ink received from the original plate to the base material, but the ink received on the blanket surface is not 100% transferred to the base material. Ink remains in the ink.
Therefore, when printing is performed continuously for a long time, the ink remaining on the blanket surface accumulates, and the printing accuracy may be significantly reduced.
Also, since the ink contains a solvent, if the ink adheres to the blanket surface for a long time, the solvent penetrates the blanket and causes the blanket to expand. This not only reduces the printing accuracy but also causes the life of the blanket to decrease.

Conventionally, the ink adhering to the surface of the blanket roll has been removed by manual cleaning, but manual cleaning is cumbersome and the apparatus must be stopped during the cleaning operation. It was causing a decline.
In view of such problems, printing apparatuses having a cleaning mechanism that automatically cleans the surface of a blanket roll without manual operation have been developed.

  For example, Patent Document 1 below discloses a blanket cleaner for a printing press in which a nonwoven fabric wound around a winding roller is brought into contact with the surface of a blanket roll while being wound around the winding roller.

However, since this disclosed technique removes ink by utilizing the capillary phenomenon of irregularly entangled fibers, a portion where the ink is sufficiently adsorbed and a portion where the ink is not adsorbed are generated, and the ink is surely ensured without unevenness. It was difficult to remove.
Further, in order to reduce the removal unevenness, it is necessary to press the non-woven fabric against the surface of the blanket roll with a relatively strong force by the pressure bonding pad, and there is a possibility that the fibers adhere to the surface of the blanket roll and the printing accuracy is lowered.
Further, since the nonwoven fabric always comes in contact with the surface of the blanket roll, wiping with the nonwoven fabric is automatically performed even when there is little residual ink, requiring a large amount of nonwoven fabric and increasing the cost.

Utility Model Registration No. 2534347

  The present invention has been made to solve the above-described problems of the prior art, and in a fine printing apparatus that transfers ink supplied to an original plate to a substrate via a blanket roll, It is an object of the present invention to provide a fine printing apparatus equipped with a blanket surface cleaning mechanism that can reliably remove residual ink without unevenness and maintain high printing accuracy over a long period of time.

  The invention according to claim 1 is a fine printing apparatus for transferring the ink supplied to the original plate to a substrate via a blanket roll, and has a cleaning mechanism for removing ink remaining on the surface of the blanket roll after the transfer. The cleaning mechanism includes a cleaning film having a pressure-sensitive adhesive layer on the surface, and a film driving mechanism that moves the cleaning film while bringing the surface into contact with the surface of the blanket roll. The present invention relates to a printing apparatus.

  The invention according to claim 2 is characterized in that the film driving mechanism includes an unwinding roll on which the cleaning film is wound, a cleaning roll for bringing the cleaning film unwound from the unwinding roll into contact with the surface of the blanket roll, The fine printing apparatus according to claim 1, further comprising a take-up roll for winding the cleaning film after contacting the surface of the blanket roll.

  The invention according to claim 3 relates to the fine printing apparatus according to claim 2, wherein the cleaning roll is composed of at least two rolls in contact with the surface of the blanket roll through the cleaning film.

  A fourth aspect of the present invention relates to the fine printing apparatus according to the second or third aspect, wherein a buffer material layer is provided on the surface of the cleaning roll.

  A fifth aspect of the present invention relates to the fine printing apparatus according to any one of the second to fourth aspects, further comprising a cleaning roll moving mechanism that moves the cleaning roll toward and away from the blanket roll.

  The invention according to claim 6 relates to the fine printing apparatus according to claim 5, wherein the film driving mechanism and the cleaning roll moving mechanism are driven once every preset number of times of printing.

  According to the first aspect of the invention, the adhesive layer on the surface of the cleaning film moves while being in contact with the surface of the blanket roll, so that the ink remaining on the surface of the blanket roll can be reliably removed without unevenness, and for a long period of time. Thus, it is possible to maintain high printing accuracy. Further, by using the pressure-sensitive adhesive, it is possible to reliably remove the ink evenly even if the contact pressure on the surface of the blanket roll is low.

  According to the invention concerning Claim 2, since a new cleaning film always comes into contact with the blanket roll surface, a high cleaning power can be exhibited.

  According to the invention of claim 3, the cleaning roll is composed of at least two rolls that come into contact with the surface of the blanket roll via the cleaning film, so that the contact time between the cleaning film and the surface of the blanket roll can be increased. Ink can be removed efficiently and reliably.

  According to the invention which concerns on Claim 4, it becomes possible to ease the force added to a blanket roll from a cleaning roll by having a buffer material layer on the surface of a cleaning roll, and can prevent damage to a blanket roll.

  According to the fifth aspect of the present invention, the cleaning roll moving mechanism for moving the cleaning roll close to and away from the blanket roll is provided so that the cleaning film is separated from the blanket roll surface during printing, and the cleaning film is blanketed during cleaning. The roll surface can be contacted.

  According to the invention of claim 6, the film driving mechanism and the cleaning roll moving mechanism are driven once every preset number of times of printing, so that the cleaning film is brought into contact with the surface of the blanket roll in an appropriate cycle. Therefore, the amount of film used can be minimized to exhibit the cleaning effect, and the cost can be reduced.

Hereinafter, a preferred embodiment of a fine printing apparatus (hereinafter simply referred to as a fine printing apparatus) provided with a blanket surface cleaning mechanism according to the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing the overall configuration of a fine printing apparatus according to the present invention, and FIG. 2 is an enlarged view of a main part of FIG.
The fine printing apparatus according to the present invention is an offset printing apparatus that transfers ink supplied to an original plate (1) to a substrate (not shown) via a blanket roll (2), and transfers the ink to the substrate. A cleaning mechanism (3) for removing ink remaining on the surface of the blanket roll (2) later is provided.

  As the original plate (1), a gravure roll can be exemplified as a representative one, but the type of the original plate used in the present invention is not limited to this, and any of an intaglio plate, a relief plate and a lithographic plate may be used. Good. Further, the form (shape) of the plate may be a roll (plate cylinder) or a plate-like flat plate.

  The blanket roll (2) has a known structure in which a rubber-like sheet (sheet having a rubber layer provided on the surface of a base fabric) (21) is wound around and fixed to the surface of a cylinder (22) (FIGS. 3 and 4). See), and receives the ink supplied to the original plate (1) and transfers it to the substrate.

In the present invention, the base material (printing object) to which ink is transferred from the blanket roll (2) is not particularly limited, and includes a glass substrate, a silicon wafer, a resin substrate, a resin film, and the like used for semiconductor devices.
The fine printing apparatus is provided with a substrate table (not shown) that can move in the horizontal direction and that can move up and down, and the substrate is placed and fixed on the substrate table and moves together with the substrate table.
At the time of printing, the substrate table moves in the horizontal direction to the lower side of the blanket roll (2) and then rises, whereby the ink supplied to the substrate surface is received by the surface of the blanket roll (2). After ink reception is completed, the substrate table is lowered and moved horizontally to a position away from the lower side of the blanket roll.

  The cleaning mechanism (3) includes a cleaning film (4) having an adhesive layer on the surface, a film driving mechanism (5) for moving the cleaning film (4) while bringing the surface into contact with the surface of the blanket roll (2), It has.

FIG. 3 is an enlarged view showing the vicinity of the contact portion between the cleaning roll (52) and the blanket roll (2), and FIG. 4 is a diagram in which only the cleaning roll (52) and the blanket roll (2) are extracted in FIG. .
The cleaning film (4) includes a base material layer (41) and an adhesive layer (42).
A base material layer (41) consists of synthetic resin films, such as PET, PP, PE, PU, COC, and COP.
The pressure-sensitive adhesive layer (42) is a layer made of a fine pressure-sensitive adhesive such as acrylic, urethane, rubber, or silicon, and the pressure-sensitive adhesive strength is 0.001 to 50,000 N / 10 mm as defined in JISZ02371. It is preferable that If the adhesive strength is less than 0.001 N / 10 mm, the residual ink on the surface of the blanket roll cannot be sufficiently removed, and if it exceeds 50,000 N / 10 mm, the adhesive may adhere to the surface of the blanket roll. This is also not preferable.

  Slight pressure-sensitive adhesives include natural rubber, synthetic rubber, acrylic, silicon, cross-linked acrylic polymers with cross-linking agents such as epoxy and isocyanate, and photo-reactive acrylic polymers. What added the monomer, the oligomer, or the polymer, etc., and what was bridge | crosslinked by the ultraviolet-ray or the heat | fever can be used.

The film drive mechanism (5) includes an unwinding roll (51) around which the cleaning film (4) is wound, and a cleaning film (4) unwound from the unwinding roll (51) on the surface of the blanket roll (2). And a take-up roll (53) for taking up the cleaning film (4) after coming into contact with the surface of the blanket roll (2).
The take-up roll (53) is taken up by a motor while controlling the tension by a powder clutch.

The unwinding roll (51) and the take-up roll (53) are arranged at positions spaced laterally from the blanket roll (2). The unwinding roll (51) is located below and the take-up roll (53) is located above. ) Are arranged respectively.
The cleaning roll (52) is composed of two rolls that come into contact with the surface of the blanket roll (2) via the cleaning film (4), and applies tension to the cleaning film (4) to blanket roll (2). Plays a role in contact with the surface.
The cleaning film (4) unwound from the unwinding roll (51) moves along the surfaces of the two cleaning rolls (52), and is then wound up by the winding roll (53).

The number of cleaning rolls (52) is two in the illustrated example, but may be three or more.
Since the cleaning roll (52) comprises at least two rolls, the contact time between the cleaning film (4) and the surface of the blanket roll (2) can be increased, and ink can be removed efficiently and reliably. It becomes.

The central angle (α) (see FIG. 2) of the line connecting the centers of the two cleaning rolls (52) and the blanket roll (2) is preferably 30 to 40 °. If the angle is less than 30 °, the contact time between the cleaning film (4) and the blanket roll surface cannot be increased. If the angle exceeds 40 °, the cleaning film is insufficiently brought into contact with the blanket roll surface. In this case, the ink removal efficiency is lowered, which is not preferable.
However, the present invention includes those having a central angle (α) of less than 30 ° and more than 40 °.

A buffer material layer (521) is provided on the surface of the cleaning roll (52), and a cleaning film (4) is disposed on the surface of the buffer material layer (521).
The buffer material layer (521) is formed from polyurethane foam, polyethylene foam, natural rubber foam sheet, synthetic rubber foam sheet, etc., and the thickness thereof is, for example, 0.05 to 20 mm.
Thus, by providing the cushioning material layer (521) on the surface of the cleaning roll (52), it is possible to reduce the force applied to the blanket roll (2) from the cleaning roll (52). The damage of 2) can be prevented.

The fine printing apparatus according to the present invention further includes a cleaning roll moving mechanism that moves the cleaning roll (52) close to and away from the blanket roll (2).
The cleaning roll moving mechanism can be constituted by an arbitrary reciprocating drive mechanism such as a linear motor, a hydraulic cylinder, a pneumatic cylinder, a rack and pinion, and the drive thereof can be controlled by a control device including a computer. In the illustrated example, a pneumatic cylinder (6) is shown as a cleaning roll moving mechanism.
The two cleaning rolls (52) are supported on a rotating shaft (71) that is rotatably provided on one supporting member (7). The support member (7) is fixed to the tip (right end) of the long member (8), and the tip of the cylinder shaft of the pneumatic cylinder (6) is connected to the base end (left end) of the long member (8). Has been.

FIGS. 5A and 5B are diagrams showing the operation of the cleaning roll moving mechanism. FIG. 5A shows a state during printing, and FIG. 5B shows a state during cleaning.
At the time of printing, the cylinder shaft of the pneumatic cylinder (6) is shortened, and the two cleaning rolls (52) are located away from the blanket roll (2).
During cleaning (non-printing), the cylinder shaft of the pneumatic cylinder (6) extends, the two cleaning rolls (52) are close to the surface of the blanket roll (2), and the cleaning film (4) is the blanket roll. Contact the surface of (2). In this state, when the take-up roll (53) is driven to rotate, the cleaning film (4) is continuously unwound from the take-up roll (51), and the surface thereof is brought to the surface of the blanket roll (2). It will move while making contact.

At this time, the adhesive layer (42) on the surface of the cleaning film (4) moves while contacting the surface of the blanket roll (2), so that the ink remaining on the surface of the blanket roll after printing (after transfer to the substrate) Can be reliably removed without unevenness.
Moreover, since it is the structure which removes ink using an adhesive, even if the contact pressure of the cleaning film (4) with respect to the surface of a blanket roll (2) is low, it can remove ink reliably.
Further, since a winder system in which the cleaning film (4) is continuously unwound from the unwinding roll (51) and the ink is removed and then wound up by the winding roll (53) is adopted, a new cleaning film is always obtained. It comes in contact with the surface of the blanket roll and can exhibit a high cleaning power.

In the present invention, it is preferable that the film driving mechanism (5) and the cleaning roll moving mechanism are controlled to be driven once every preset number of times of printing. Specifically, for example, it is preferable to drive the film driving mechanism (5) and the cleaning roll moving mechanism every 1 to 100 times.
By performing such control, the usage amount of the cleaning film (4) can be minimized so that the cleaning effect can be exhibited, and the printing cost can be reduced.
Such control can be realized by controlling the drive of the servo motor and the pneumatic cylinder (6) for driving the take-up roll (53) by the control device described above.

  The present invention can be applied to an offset printing apparatus such as a gravure offset printing apparatus.

1 is a side view showing an overall configuration of a fine printing apparatus according to the present invention. It is a principal part enlarged view of FIG. It is an enlarged view which shows the contact part vicinity of a cleaning roll and a blanket roll. It is the figure which extracted only the cleaning roll and the blanket roll in FIG. It is a figure which shows the effect | action of a cleaning roll moving mechanism, Comprising: (a) is the state at the time of printing, (b) has shown the state at the time of cleaning.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Master 2 Blanket roll 3 Cleaning mechanism 4 Cleaning film 41 Base material layer 42 Adhesive layer 5 Film drive mechanism 51 Unwinding roll 52 Cleaning roll 521 Buffer material layer 53 Winding roll 6 Pneumatic cylinder (cleaning roll moving mechanism)

Claims (6)

A fine printing apparatus for transferring ink supplied to an original plate to a substrate via a blanket roll, and having a cleaning mechanism for removing ink remaining on the surface of the blanket roll after the transfer,
The fine printing apparatus, wherein the cleaning mechanism includes a cleaning film having an adhesive layer on a surface, and a film driving mechanism that moves the cleaning film while contacting the surface of the cleaning film with the surface of the blanket roll.   The film driving mechanism includes an unwinding roll on which the cleaning film is wound, a cleaning roll for bringing the cleaning film unwound from the unwinding roll into contact with the surface of the blanket roll, and after contacting the surface of the blanket roll. The fine printing apparatus according to claim 1, further comprising a take-up roll for winding the cleaning film.   The fine printing apparatus according to claim 2, wherein the cleaning roll includes at least two rolls that contact the surface of the blanket roll with the cleaning film interposed therebetween.   4. The fine printing apparatus according to claim 2, further comprising a buffer layer on a surface of the cleaning roll.   The fine printing apparatus according to claim 2, further comprising a cleaning roll moving mechanism that moves the cleaning roll toward and away from the blanket roll.   6. The fine printing apparatus according to claim 5, wherein the film driving mechanism and the cleaning roll moving mechanism are driven once every preset number of times of printing.

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