JP2012111064A - Roll blanket dryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roll blanket dryer which can efficiently dry print ink solvent that permeates a blanket of a blanket roll during printing process being conducted on an off-set printing machine by air flow flowing while forming turbulence around the surface of the blanket, and also can prevent air containing printing ink solvent vapor from discharging into the ambient surrounding.SOLUTION: The blanket roll 1 includes: a blanket 2; a dry block 3 provided outside the blanket 2, including a slit-like suction port 6 and extending in a direction parallel to the roll axis center direction in the center of a curvature-shaped direction; a flow channel-forming surface 4 of the curvature-shape, extending in the parallel direction to the roll axis center of the blanket roll 1 in accordance with the width size of the blanket 2 and having its bottom surface running along the outer circumference surface of the blanket 2; and an air flow channel 5 formed between the flow channel-forming surface 4 and the outer circumference surface of the blanket 2. The flow channel-forming surface 4 has a turbulence forming groove 11 extending in the parallel direction to the axial center of the roll. When a sucking means 9 reduces the pressure of the suction port 6 to allow air suction ports 5a on both sides of the air flow channel 5 to let air 12 flow toward the suction port 6, the turbulent forming groove 11 generates swirl of turbulence vertical to the air flow direction, thereby: stirring the air 12 in the proximity of the outer circumference surface of the blanket 2; and constantly reducing the solvent vapor pressure in the proximity of the surface of the blanket 2 to accelerate the solvent vaporization.

Description

  The present invention relates to a roll blanket drying apparatus used for drying a blanket of a blanket roll that swells by absorbing a solvent of printing ink when performing offset printing.

  In an offset printing apparatus known as one type of printing apparatus, printing ink attached to a printing pattern groove (concave portion) of a plate is temporarily transferred (accepted) to the outer peripheral surface of the blanket roll, and then the blanket roll When the printing cycle for performing the retransfer (printing) process of the printing ink to the surface to be printed is repeated, the blanket provided on the outer periphery of the blanket roll gradually absorbs the solvent (solvent) of the printing ink (the blanket It is known that a phenomenon occurs in which the blanket swells as the solvent of the printing ink gradually permeates).

  By the way, in recent years, an image display element such as a liquid crystal display on a substrate using a printing technique using a conductive paste as a printing ink, for example, an intaglio offset printing technique, instead of fine processing such as etching of a metal vapor deposition film. There has been proposed a method of forming the electronic circuit by printing.

  When an electronic circuit is formed on the substrate by printing, the line width to be an electrode may be required to be as fine as, for example, about 10 μm. Higher printing accuracy is required compared to offset printing.

  Therefore, in this type of offset printing apparatus that requires high printing accuracy, if the blanket swells more than acceptable due to absorption of the printing ink solvent as described above during printing processing, transfer (acceptance) from the plate cannot be performed. If the thickness of the blanket changes due to swelling of the blanket, the outer diameter of the blanket roll changes, and the swollen portion of the blanket becomes soft. In addition, there is a concern that the printing pressure (contact pressure) when the blanket roll is brought into contact with a plate or a printing object changes, so that high printing accuracy cannot be satisfied, and the life of the blanket itself may be shortened. The

  Therefore, in an offset printing apparatus that is required to print a fine (high-definition) printing pattern with high printing accuracy, in order to avoid the problems due to the swelling of the blanket, a plate and printing using a blanket roll are performed during the printing process. When the printing cycle of printing ink transfer and retransfer to the target is completed, air is blown from the air outlet of the air contact means to the blanket on the outer periphery of the blanket roll until the next printing cycle starts. Conventionally, it has been proposed to dry the solvent of the printing ink absorbed in the blanket (see, for example, Patent Document 1).

  As another method, in the offset printing apparatus, one end side and the other end side of a flow path formed between a blanket of a blanket roll and an arc-shaped cover member disposed along the outer peripheral surface of the blanket. The blower blower and the exhaust blower are connected to each other, and when the print pattern is transferred (received) from the plate to the outer peripheral surface of the blanket roll, the print pattern is disposed at a position facing the flow path. Thus, by allowing the dry air supplied from the blower blower to flow through the flow path, the printing pattern on the outer peripheral surface of the blanket can be dried to some extent, and swelling of the blanket due to the solvent of the printing ink can be prevented. It has been proposed in the past (see, for example, Patent Document 2).

  Further, the vacuum suction cover is disposed close to the outer peripheral surface of the blanket, and the vacuum exhaust passage is evacuated by a vacuum pump connected to the vacuum exhaust passage of the vacuum suction cover, and is absorbed by the blanket. It has also been conventionally proposed to remove the solvent of the printing ink by suction (see, for example, Patent Document 3).

JP 2006-231683 A JP 2008-254415 A JP 2000-135852 A

  However, the one disclosed in Patent Document 1 is for drying the solvent of the printing ink absorbed in the blanket so as to blow air on the outer peripheral surface of the blanket, and the air sprayed on the outer peripheral surface of the blanket. It is considered that the air flow can be disturbed at the location where the airflow collides, but the air after colliding with the outer peripheral surface of the blanket only flows along the outer peripheral surface of the blanket, and the outer periphery of the blanket Since only a uniform gap is formed between the surface and the air contact means, when the air after colliding with the blanket passes through the gap, the air flow tends to be a laminar flow. Therefore, when the solvent vapor (evaporating solvent) of the printing ink is released into the air from the surface of the blanket, the vapor pressure of the solvent in the vicinity of the surface of the blanket is always lowered to improve the drying efficiency. Difficult to get.

  Further, in the one disclosed in Patent Document 1, since air is blown to flow on the outer peripheral surface of the blanket, the air containing the solvent vapor of the ink after being used for drying the blanket is released to the surrounding environment. Therefore, there is a concern about deterioration of the surrounding environment.

  On the other hand, what is disclosed in the cited document 2 is a printing ink having a printing pattern transferred (accepted) to the outer peripheral surface of the blanket by air circulated through a flow path formed between the blanket and the arc-shaped cover member. Therefore, the flow rate of the air brought into contact with the outer peripheral surface of the blanket is limited to the extent that the printed pattern is not disturbed.

  Moreover, since the flow path is only formed uniformly along the outer peripheral surface of the blanket, there is a problem similar to that described in Patent Document 1.

  The one disclosed in Patent Document 3 promotes evaporation of the ink solvent from the outer peripheral surface of the blanket by depressurizing the inside of the vacuum suction cover. It is not meant to be dried.

  Therefore, the present invention efficiently dries the solvent of the printing ink soaked into the blanket of the blanket roll during the printing process in the offset printing apparatus by the flow of air that flows while generating turbulent flow near the surface of the blanket. In addition, an object of the present invention is to provide a roll blanket drying apparatus that can prevent the release of the air containing the vapor of the solvent of the printing ink into the surrounding environment.

  In order to solve the above-mentioned problem, the present invention corresponds to claim 1, and the outer peripheral surface of the blanket extends in a direction parallel to the roll axis direction of the blanket roll and has a bottom surface provided on the outer peripheral portion of the blanket roll. Is disposed outside the position to be dried on the outer peripheral surface of the blanket, and the air intake is provided between the flow path forming surface of the drying block and the blanket. Moreover, forming an air flow path for circulating air along the outer peripheral surface of the blanket to the suction port provided on the flow path forming surface of the drying block, and while the air enters the air flow channel and reaches the suction port A turbulent flow forming portion extending in a direction parallel to the roll axis direction on the flow path forming surface of the air flow, causing turbulence to be generated by the turbulent flow forming portion in the air flow flowing through the air flow path, Up The roll blanket drying device having to be made a configuration can stir the air in the vicinity of the outer peripheral surface of the blanket in the air flow path.

  Moreover, in the said structure, let the suction port provided in the flow path formation surface of a drying block be the slit shape extended in the direction parallel to the roll axial center direction of a blanket roll, and let it be the structure which connected this suction port to the suction means.

  Furthermore, in each said structure, it is set as the structure which connected the air supply means to the air intake of an air flow path.

  Furthermore, in each of the above-described configurations, the turbulent flow forming portion is configured by either a turbulent flow forming groove or a turbulent flow forming convex portion on the flow path forming surface of the drying block, or the turbulent flow forming groove. And turbulent flow forming convex portions are provided alternately.

According to the roll blanket drying apparatus of the present invention, the following excellent effects are exhibited. (1) A drying block that extends in a direction parallel to the roll axis direction of the blanket roll and has a bottom surface provided on the outer peripheral portion of the blanket roll as a curved flow path forming surface along the outer peripheral surface of the blanket. The blanket is disposed outside the position to be dried on the outer peripheral surface of the sheet and between the flow path forming surface of the drying block and the blanket, from the air intake to the suction port provided on the flow path forming surface of the drying block. A direction parallel to the roll axis direction is formed on the flow path forming surface between the air entering the air flow path and reaching the suction port. A turbulent flow forming portion extending to the air flow path, causing the turbulent flow to be generated by the turbulent flow forming portion in the air flow flowing through the air flow path, and causing the air near the outer peripheral surface of the blanket in the air flow path to Since it is configured to be able to stir, the flow of the air flowing through the air flow channel and the turbulent flow formed by the turbulent flow forming unit with respect to the air flow, the blanket facing the air flow channel Since a flow of air having a low vapor concentration of the printing ink solvent can always exist in the vicinity of the outer peripheral surface, the evaporation of the printing ink solvent from the surface of the blanket is promoted, and the printing ink soaked into the blanket The solvent can be efficiently dried.
(2) Therefore, when performing the offset printing process in the offset printing apparatus, the possibility that the blanket swells due to the solvent of the printing ink can be suppressed, so that the continuity of the offset printing process can be improved. It becomes possible.
(3) By collecting the air containing the solvent vapor after being supplied to the drying of the printing ink solvent from the blanket by circulating the air flow path, the solvent of the printing ink is recovered. It is possible to prevent the surrounding environment from being deteriorated by the steam.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of a roll blanket drying apparatus according to the present invention, where (A) is a schematic cut side view, and (B) is an enlarged view of a turbulent flow forming groove provided on a flow path forming surface of a drying block. FIG. It is an AA direction arrow line view of FIG. It is a figure corresponding to FIG. 2 which shows the other form of implementation of this invention. It is a general | schematic cutaway side view which shows other form of implementation of this invention. It is a general | schematic cutaway side view which shows other form of implementation of this invention. As still another embodiment of the present invention, another example of the turbulent flow forming groove provided on the flow path forming surface is shown. (A) is a rectangular turbulent flow forming groove, (B) is FIG. 5C is a cut side view showing a case where a turbulent flow forming groove having a side semicircular shape and (c) a turbulent flow forming groove having a triangular side surface shape are provided on a flow path forming surface, respectively. As still another embodiment of the present invention, another example of the turbulent flow forming portion provided on the flow path forming surface is shown. (A) is a turbulent flow forming convex portion having a right side triangular shape, (B) FIG. 6 is a cut side view showing a case where a side surface rectangular turbulent flow forming convex portion is provided on the flow path forming surface, and (c) is a side surface substantially semicircular turbulent flow forming convex portion. As still another embodiment of the present invention, still another example of a turbulent flow forming portion provided on a flow path forming surface is shown. (A) is a turbulent flow forming groove and a turbulent flow forming groove having a right side triangular shape. (B) is a side surface rectangular turbulent flow forming groove and turbulent flow forming convex portion, (c) is a side semi-circular turbulent flow forming groove and turbulent flow forming convex portion, It is a cut side view showing the case where each is provided alternately on the flow path forming surface.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  FIGS. 1A, 1B and 2 show an embodiment of the roll blanket drying apparatus of the present invention, which has the following configuration.

  That is, the roll blanket drying apparatus I of the present invention has a long dimension in a direction parallel to the roll axis direction of the blanket roll 1 (hereinafter simply referred to as the roll axis direction), and the circumferential direction of the blanket roll 1 The front-rear direction along the (rotational direction) is a width dimension over a predetermined region, and the bottom surface is a curved (arc-shaped) flow along the outer peripheral surface of the blanket 2 provided on the outer peripheral portion of the blanket roll 1. The dimension of the path forming surface 4 and the direction parallel to the roll axis direction are slightly longer than the width dimension in the direction parallel to the roll axis direction of the blanket 2 in the area where the printing pattern is transferred from the plate (not shown). A blanket 2 is provided in a space between the outer peripheral surface of the blanket 2 and the flow path forming surface 4 of the drying block 3 disposed in the vicinity thereof, including the drying block 3. Along the outer circumferential surface so as to form a air flow path 5 extending in the circumferential direction.

  The flow path forming surface 4 of the drying block 3 is provided with a slit-like suction port 6 extending in the width direction parallel to the roll axial direction at an intermediate position in the bending direction, and the suction port 6 is provided. A suction means 9 such as an exhaust blower or a suction pump is connected to the air outlet 8 through a suction line 10 in communication with the outside through an air discharge path 7 and an air outlet 8 provided inside the drying block 3. .

  Furthermore, a turbulent flow forming groove 11 serving as a turbulent flow forming portion extending in the width direction parallel to the roll axial direction is provided at another location in the curved direction of the flow path forming surface 4 of the drying block 3, The air flow path 5 formed between the flow path forming surface 4 of the drying block 3 and the outer peripheral surface of the blanket 2 is changed to a flow of air 12 flowing toward the suction port 6 along the outer peripheral surface of the blanket 2. In contrast, the turbulent flow forming groove 11 is configured to generate turbulent flow.

  Specifically, the drying block 3 has a certain dimension in the front-rear direction and the height direction, and has a substantially rectangular side shape, and is parallel to the roll axis direction of the blanket 2 in a direction parallel to the roll axis direction. A dimension slightly longer than the width dimension in the direction is provided.

  Further, at the both ends of the drying block 3 in the direction parallel to the roll axis direction, the bottom end of the blanket 2 protrudes outward from both ends in the direction parallel to the roll axis direction. A side plate 13 having a curved shape (arc shape) that protrudes closer to the blanket roll 1 than the flow path forming surface 4 of the block 3 and that has a protruding end surface close to the outer peripheral surface of the blanket roll 1 is provided. It is attached integrally. As a result, the protruding end surface of the side plate 13 is placed on a required portion in the circumferential direction of the blanket roll 1, for example, on the outer peripheral surface of the portion that becomes the upper end portion in the circumferential direction as shown in FIG. As a clearance that can maintain a non-contact state even when considering the fluctuation of the outer peripheral surface in the manufacturing accuracy, for example, if the clearance is arranged with a clearance of about 0.5 mm, the flow path forming surface 4 of the drying block 3 and A clearance larger than the clearance between the protruding end surface of the side plate 13 and the outer peripheral surface of the blanket roll 1, for example, a clearance of about 2 mm, is provided between the outer peripheral surface of the blanket 2 provided on the outer peripheral portion of the blanket roll 1. It can be held. Therefore, in the space between the flow path forming surface 4 of the drying block 3 and the outer peripheral surface of the blanket 2 with a clearance of about 2 mm, air intakes 5a are provided at both ends in the bending direction and both sides in the roll axis direction are provided. The air 12 is allowed to flow over a certain length in the circumferential direction along the outer peripheral surface of the blanket 2 in a state in which the air 12 is prevented from being blown from the outside to the inside of the side plates 13 provided in A possible air flow path 5 can be formed.

  The suction port 6 of the drying block 3 is provided at the center of the flow path forming surface 4 of the drying block 3 in the bending direction so as to extend in a direction parallel to the roll axis direction.

  The section corresponding to the suction port 6 inside the drying block 3 has a cross-sectional shape like a slit extending in the direction parallel to the roll axial direction similar to the suction port 6, and the drying block extends from the suction port 6. Air discharge path 7 extending in a direction perpendicular to the roll axis direction to a position near the top of 3, and a plurality of predetermined intervals in a direction parallel to the roll axis at the end of the air discharge path 7 near the top, for example, 2 are provided with air outlets 8 communicating with the outside of the drying block 3 at three locations as shown in FIG.

  Further, the other end side of the suction line 10 having one end connected to the suction means 9 is branched according to the number of the air outlets 8 in the drying block 3, and each branch end is connected to the air outlet. 8 are individually connected.

  As a result, the suction port 6 is depressurized through the suction line 10 and the air outlet 8 and the air discharge path 7 of the drying block 3 by the operation of the suction means 9, whereby the flow path forming surface 4 of the drying block 3. In the air flow path 5 formed between the air flow path 5 and the outer peripheral surface of the blanket 2, the air 12 sucked through the air intake ports 5 a at both ends in the curved direction of the air flow path 5 is supplied to the suction opening 6. 2 can be distributed along the outer peripheral surface.

  The turbulent flow forming groove 11 provided on the flow path forming surface 4 of the drying block 3 is formed from the air inlet of the air flow path 5 from the portion where the suction port 6 is provided in the middle portion of the flow path forming surface 4 in the bending direction. The flow path is provided at one or a plurality of locations in the curved direction in the region between the both ends of the curved direction of the flow path forming surface 4 serving as the intake 5a, for example, two locations as shown in FIG. The forming surface 4 is provided over the entire length in the width direction parallel to the roll axis direction.

  As shown in FIG. 1 (b), the turbulent flow forming groove 11 is an edge of the air flow path 5 on the side close to the air inlet 5a, that is, an edge located on the upstream side in the air flow direction. In addition, the groove c is bent at an angle of about 90 to 135 degrees, and the depth of the groove is ½ or more of the dimension along the curved direction of the flow path forming surface 4. It is assumed that it is set to. For example, when the dimension of the flow path forming surface 4 of the turbulent flow forming groove 11 in the bending direction is 10 mm, the depth dimension of the groove may be set to 5 mm or more.

  More specifically, the turbulent flow forming groove 11 is formed on the side close to the air inlet 5a (see FIG. 1 (a)) of the air flow path 5 as shown in FIG. 1 (b), for example. A corner portion c that bends at an angle of 90 degrees is provided at the end edge to form a right-angled triangular groove as viewed from the side. Thus, when the air 12 flows from the air inlet 5a toward the suction port 6 in the air flow path 5, the angle between the flow path forming surface 4 and the inner surface of the turbulent flow forming groove 11 is the corner portion. With the sudden change at c, the flow of the air 12 is separated from the inner surface of the turbulent flow forming groove 11 so as to form a flow entrapped inside the turbulent flow forming groove 11. is there. Therefore, the vortex of the turbulent flow perpendicular to the flow direction with respect to the flow of the air 12 from the air intake port 5a to the suction port 6 due to the flow of the air 12 caught inside the turbulent flow forming groove 11 Can be formed. Therefore, when the air 12 flows through the air flow path 5, the turbulent vortex generated in the flow of the air 12 at the location where the turbulent flow forming groove 11 is provided causes the air 12 in the air flow path 5 to flow. By preventing the flow from becoming a laminar flow, the air 12 existing in the vicinity of the outer peripheral surface of the blanket 2 can be efficiently stirred.

  Reference numeral 14 denotes a flow rate adjusting valve such as an electromagnetic valve provided at a location closer to one end than the branch location of each branch line on the other end side in the suction line 10, and controls the opening degree of the flow rate adjusting valve 14. As a result, the rate at which the suction port 6 is depressurized through the suction line 10, the air outlet 8, and the air discharge path 7 is changed by the operation of the suction means 9, and the air inlet 5 is changed to the air flow path 5. The flow rate of the air 12 circulated from 5a toward the suction port 6 can be adjusted.

  When the roll blanket drying apparatus I of the present invention having the above-described configuration is used, the roll blanket drying apparatus I of the present invention is used in advance for the offset printing apparatus installed in a clean room (not shown). The air flow path 5 is formed between the flow path forming surface 4 of the drying block 3 and the blanket 2 outside the position to be dried set at one place in the circumferential direction on the outer peripheral surface of each of the side plates 13. The projecting end surfaces of the blanket 2 are arranged so as to be close to the outer peripheral surface of the blanket roll 1 on both sides in the direction parallel to the roll axis direction of the blanket 2 with the predetermined clearance described above.

  After that, a printing pattern transfer (acceptance) process from the plate (not shown) in the offset printing process to the surface of the blanket 2 of the blanket roll 1, and a substrate or the like to be printed from the surface of the blanket 2 of the blanket roll 1 (see FIG. The blanket roll 1 is fixed in the direction indicated by the arrow r in FIG. 1 (a) after completing the printing cycle of the retransfer (printing) process to the next printing cycle. The suction means 9 is operated in a state where the suction means 9 is rotated.

  As a result, the suction port 6 is depressurized through the suction line 10, the air outlet 8, and the air discharge path 7 by the suction action of the suction means 9, so that the air intake port at both ends thereof is connected to the air channel 5. Cleaned air 12 in the clean room (not shown) is taken in through 5a, and air 12 taken in from the air intake port 5a is circulated toward the suction port 6 through the air flow path 5. It becomes like this. At this time, by controlling the opening degree of the flow rate adjusting valve 14, the flow rate of the air 12 flowing from the air intake port 5a toward the suction port 6 in the air flow path 5 is set to about 10 to 20 m / It may be adjusted so as to be s.

  When the flow of the air 12 from the air intake port 5a toward the suction port 6 is formed in the air flow path 5 as described above, at the portion facing the air flow path 5 on the outer peripheral surface of the blanket 2, the blanket 2 The solvent vapor of the printing ink evaporated from the outer peripheral surface is immediately removed from the vicinity of the surface of the blanket 2 by the flow of the air 12 flowing through the air flow path 5.

  Further, at this time, the air 12 flowing through the air flow path 5 is turbulent perpendicular to the flow direction of the air 12 toward the suction port 6 when passing through the place where the turbulent flow forming groove 11 is provided. Therefore, the air 12 existing in the vicinity of the outer peripheral surface of the blanket 2 is efficiently stirred by the turbulent vortex. Therefore, a flow of air 12 having a low vapor concentration (vapor pressure) of the solvent of the printing ink always exists in the vicinity of the outer peripheral surface of the blanket 2 facing the air flow path 5. The evaporation of the ink solvent from the surface of the blanket 2 is promoted.

  Therefore, the blanket 2 has the entire outer peripheral surface thereof as the portion of the outer peripheral surface facing the air flow path 5 is sequentially changed by the rotation of the blanket roll 1. The air is continuously dried by the air 12 flowing through the air flow path 5.

  The air 12 after being supplied to the drying of the printing ink solvent from the blanket 2 by flowing through the air flow path 5 contains vapor of the printing ink solvent. In the blanket drying apparatus I, the air 12 is circulated through the air flow path 5 by the suction force of the suction means 9, so that the air 12 containing the vapor of the solvent is supplied from the suction port 6 to the drying block 3. The air is discharged through the air discharge path 7, the air outlet 8, and the suction line 10 to the suction means 9.

  Thus, according to the roll blanket drying apparatus of the present invention, the solvent of the printing ink soaked into the blanket 2 is disturbed with respect to the flow of the air 12 flowing through the air flow path 5 and the flow of the air 12. The blanket 2 can be efficiently dried by using the turbulent vortex formed by the flow forming groove 11, and the blanket 2 can be efficiently dried.

  Therefore, when performing the offset printing process in the offset printing apparatus, the possibility that the blanket 2 is swollen by the solvent of the printing ink can be suppressed, so that the continuity of the offset printing process can be improved. become.

  Further, the air 12 containing the solvent vapor after being supplied to the printing ink solvent from the blanket 2 by flowing through the air flow path 5 is guided to the suction means 9 for recovery. Therefore, it is possible to prevent the surrounding environment of the blanket 2 or the blanket roll 1 from being deteriorated by the vapor of the solvent of the printing ink.

  In the said embodiment, although the drying block 3 was shown as a thing slightly longer than the width dimension of the direction parallel to the roll axial direction of the blanket 2 in the direction parallel to the roll axial direction, the said blanket The width dimension in the direction parallel to the roll axis direction in 2 is larger than the area where the print pattern is transferred from a plate (not shown), and the print pattern is formed at both end edges of the blanket 2 in the direction parallel to the roll axis direction. When there is a blank area (not shown) to which the toner is not transferred, as shown in FIG. 3, the length dimension in the direction parallel to the roll axis direction of the drying block 3 is set to the roll axis direction of the drying block 3. Side plates 13 provided at both end portions in a direction parallel to the side of the blanket 2 are disposed corresponding to blank areas at both end edges in the direction parallel to the roll axis direction of the blanket 2. It may be set such a length dimension.

  In this case, the protruding end surface on the bottom side of each side plate 13 may be a curved shape (arc shape) along the outer peripheral surface of the blanket 2, and the protruding end surface of each side plate 13 may be As a clearance that can maintain a non-contact state with respect to a blank area at both end edges in a direction parallel to the roll axis direction, even if the outer peripheral surface shake in the manufacturing accuracy of the blanket 2 is taken into account, for example, a clearance of about 1 mm Is disposed between the flow path forming surface 4 of the drying block 3 and the outer peripheral surface of the blanket 2 provided on the outer peripheral portion of the blanket roll 1. A structure that can hold a clearance larger than the clearance between the protruding end surface and the outer peripheral surface of the blanket 2, for example, about 5 mm. And it should be. As a result, in the space between the flow path forming surface 4 of the drying block 3 and the outer peripheral surface of the blanket 2 with a clearance of about 5 mm, the outside of each side plate 13 provided on both sides in the roll axis direction. The air flow path 5 can be formed in which the air 12 can be circulated along the outer peripheral surface of the blanket 2 in a state in which the air 12 is prevented from being blown into the inside.

  Next, FIG. 4 shows another embodiment of the present invention. The roll blanket drying apparatus I according to the present embodiment has a curved (arc-shaped) flow along the outer peripheral surface of the blanket 2 on the bottom side in the same manner as the drying block 3 shown in FIGS. The drying block 3A as the path forming surface 4 is placed near one end of the flow path forming surface 4 in the curving direction, for example, near the front end of the drying block 3A (closest to the left end in FIG. 4). A slit-like suction port 6 extending in the parallel width direction is opened and provided.

  The suction port 6 is the bottom of the drying block 3A as shown in FIGS. 1 (A) and (B) and FIG. 2 provided at a position near the front end inside the drying block 3A corresponding to the suction port 6. From the side to the top side, communicated with the outside of the drying block 3A through an air discharge path 7 and an air outlet 8 extending in a direction substantially orthogonal to the roll axis direction, and connected to the suction means 9 through a suction line 10 is there.

  Further, a plate-like seal portion 15 that protrudes closer to the blanket 2 than the flow path forming surface 4 is rolled to the bottom of the front end portion, which is the front end side of the suction port 6 in the drying block 3A. It is provided over the entire length in the direction parallel to the axial direction. Thus, when the air flow path 5 extending in the circumferential direction is formed between the flow path forming surface 4 of the drying block 3A and the outer peripheral surface of the blanket 2, the protruding end surface (bottom surface) of the seal portion 15 is The air 12 from the outside to the inside of the seal portion 15 is arranged in a non-contacting proximity to the outer peripheral surface of the blanket 2 with a clearance that is narrower than the clearance between the flow path forming surface 4 and the outer peripheral surface of the blanket 2. Blow-through can be suppressed. Therefore, in the air flow path 5, only the other end in the bending direction of the air flow path 5 is used as the air intake port 5 a, and the air 12 sucked from the air intake port 5 a is placed on the outer peripheral surface of the blanket 2 up to the suction port 6. It can be distributed along.

  The flow path forming surface 4 of the drying block 3A forming the air flow path 5 has one or more curved directions in the region between the air intake port 5a and the suction port 6, for example, As shown in FIGS. 1 (a) and 1 (b), the air flow passage 5 is located on the side close to the air inlet 5a, that is, on the upstream side in the air flow direction, as shown in FIG. A turbulent flow forming groove 11 having a right side triangular shape having a corner portion c is provided at an edge of the flank.

  Other configurations are the same as those shown in FIGS. 1A and 1B and FIG. 2, and the same components are denoted by the same reference numerals.

  Even with the roll blanket drying apparatus of the present embodiment having the above-described configuration, when the suction means 9 is operated in a state where the blanket roll 1 is rotated at a certain speed in the direction indicated by the arrow r in FIG. Since the suction port 6 is depressurized by the suction action of the suction means 9, clean air 12 in a clean room (not shown) taken in through the air intake port 5 a in the air flow path 5 is supplied to the suction port 6. The air 12 can flow along the outer peripheral surface of the blanket 2 and the air 12 flows toward the suction port 6 when the flow of the air 12 passes through the portion where the turbulent flow forming groove 11 is provided. Turbulent vortices perpendicular to the flow direction can be generated. For this reason, the flow of air 12 having a low vapor concentration (vapor pressure) of the solvent of the printing ink can always be present in the vicinity of the outer peripheral surface of the blanket 2 facing the air flow path 5. The evaporation of the printing ink solvent from the surface of the blanket 2 can be promoted.

  Therefore, according to the present embodiment, the same effects as those of the embodiment of FIGS. 1A and 1B and FIG. 2 can be obtained.

  Next, FIG. 5 shows still another embodiment of the present invention, and the roll blanket drying apparatus I of the present embodiment is the same as the drying block 3 shown in FIGS. A drying block 3B having a bottom surface side as a curved (arc-shaped) flow path forming surface 4 along the outer peripheral surface of the blanket 2 is located near the front end of the flow path forming surface 4 in the curved direction (close to the left end in FIG. 5). And it is set as the structure formed by opening the slit-shaped suction inlets 6a and 6b extended in the direction parallel to a roll axial direction at the position near a rear end (near the right end in FIG. 5).

  The suction ports 6a and 6b are provided in the drying block 3B in the same manner as those shown in FIGS. 1A and 1B and FIG. It communicates with the outside of the drying block 3A through an air discharge passage 7 and an air outlet 8 extending from the bottom side to the top side in a direction substantially orthogonal to the roll axis direction, and is connected to the suction means 9 via a suction line 10. It is.

  In the drying block 3B, there is a flow path forming surface on the bottom of the front end portion that is the front end side of the front suction port 6a and the bottom portion of the rear end portion that is the rear end side of the rear suction port 6b. A plate-like seal portion 15 is provided over the entire length in a direction parallel to the roll axial direction, which protrudes to a side closer to the blanket 2 having a certain dimension than 4.

  Further, a slit-like air intake 5b extending in the width direction parallel to the roll axis direction is provided at the center of the flow path forming surface 4 in the bending direction, and the air intake 5b inside the drying block 3B is provided. And an air introduction path 16 that extends through the drying block 3B from the bottom side to the top side and communicates with the outside. Thereby, when forming the air flow path 5 extended in the circumferential direction between the flow-path formation surface 4 of the said drying block 3B, and the outer peripheral surface of the blanket 2, the protrusion end surface of the seal part 15 before and behind the said drying block 3B By arranging the (bottom surface) close to the outer peripheral surface of the blanket 2 in a non-contact manner with a narrower clearance than the clearance between the flow path forming surface 4 and the outer peripheral surface of the blanket 2, The air 12 can be prevented from being blown into the inside. Therefore, in the air flow path 5, the air 12 sucked from the air intake port 5 b disposed in the central portion in the curved direction of the air flow path 5 through the air introduction path 16 is blanketed to the suction port 6. 2 can be distributed along the outer peripheral surface.

  The flow path forming surface 4 of the drying block 3B forming the air flow path 5 has one or a plurality of curved directions in a region from the air intake port 5b to the suction ports 6a and 6b, For example, at two locations as shown in FIG. 5, as in the case shown in FIGS. 1A and 1B, the upstream side in the air flow direction that is the side close to the air inlet 5 b of the air flow path 5. Is provided with a turbulent flow-forming groove 11 having a right side triangular shape with a corner c at the edge located at the side.

  Other configurations are the same as those shown in FIGS. 1A and 1B and FIG. 2, and the same components are denoted by the same reference numerals.

  Even with the roll blanket drying apparatus of the present embodiment having the above configuration, when the suction means 9 is operated in a state where the blanket roll 1 is rotated at a certain speed in the direction indicated by the arrow r in FIG. Since the suction ports 6a and 6b are depressurized by the suction action of the suction means 9, clean air 12 in a clean room (not shown) taken into the air flow path 5 through the air introduction path 16 and the air intake port 5b In the air flow path 5, the air can flow along the outer peripheral surface of the blanket 2 toward the suction ports 6 a and 6 b, and the flow of the air 12 is provided with the turbulent flow forming groove 11. When passing, a turbulent vortex perpendicular to the flow direction of the air 12 toward the suction ports 6a and 6b can be generated. For this reason, the flow of air 12 having a low vapor concentration (vapor pressure) of the solvent of the printing ink can always be present in the vicinity of the outer peripheral surface of the blanket 2 facing the air flow path 5. The evaporation of the printing ink solvent from the surface of the blanket 2 can be promoted.

  Therefore, according to the present embodiment, the same effects as those of the embodiment of FIGS. 1A and 1B and FIG. 2 can be obtained.

  In the embodiment shown in FIGS. 1 (a) and (b) and FIG. 2, the embodiment shown in FIG. 4, and the embodiment shown in FIG. 5, all are connected to the inlets 6, 6a, 6b side of the air flow path 5. Although the case where the air 12 is circulated through the air flow path 5 by reducing the pressure of the suction ports 6, 6 a, 6 b by the suction action of the suction means 9 is shown, for example, as shown by a two-dot chain line in FIG. 5. An air supply means is provided at the upstream end portion of the air introduction path 16 provided on the upstream side of the air intake port 5b in the air flow path 5, specifically on the upstream side of the air intake port 5b in the drying block 3B. 17 is connected to the air supply means 17 so as to supply the air 12 to the air intake 5a and the suction action of the suction means 9 connected to the suction port 6 side. So that air 12 flows through the passage 5 It may be.

  In this case, the suction amount of the air 12 by the suction means 9 is set to be slightly higher than the air supply amount by the air supply means 17. Thereby, the air 12 containing the vapor of the solvent of the printing ink that has been used for drying the blanket 2 by flowing through the air flow path 5 can be sucked into the suction means 9 and collected. Air 12 containing the solvent of the printing ink solvent is prevented from being released to the surrounding environment.

  As described above, the air supply means 17 is connected to the air intake port 5a side of the air flow path 5 so that the load on the suction means 9 connected to the suction port 6 side of the air flow path 5 is reduced. Therefore, it is possible to expect the effect that it is possible to reduce the suction capacity required for the suction means 9.

  Although not shown, an air supply means 17 (see FIG. 5) similar to the above is connected to the upstream side of the air intake 5a of the air flow path 5 in the embodiment of FIGS. In this case, the effect of reducing the burden on the suction means 9 connected to the suction port 6 side of the air flow path 5 can be expected.

  In each of the above embodiments, the configuration in which the turbulent flow forming groove 11 having a right side triangular shape is provided on the flow path forming surface 4 of the drying blocks 3, 3A, 3B has been described. The turbulent flow forming grooves provided on the forming surface 4 are at an angle of about 90 to 135 degrees on the air intake 5a, 5b side in the air flow path 5, that is, on the upstream edge in the flow direction of the air 12. The groove c is bent and the depth of the groove is set to be about ½ or more of the dimension along the curved direction of the flow path forming surface 4. If the turbulent vortex perpendicular to the flow direction can be generated with respect to the flow of the air 12 flowing through the path 5, for example, the turbulence having a rectangular side surface as shown in FIG. Flow forming groove 11a, side surface semicircular turbulent flow forming groove 11b as shown in FIG. 6 (c) turbulent flow forming grooves 11c was such side shape a triangular shown in the like may be adopted a shape other than sides right triangle.

  Furthermore, if it is possible to generate a turbulent vortex perpendicular to the flow direction of the air 12 flowing through the air flow path 5, the flow paths of the drying blocks 3, 3A, 3B Examples of the turbulent flow forming portion provided on the forming surface 4 include a turbulent flow forming convex portion 18a having a right side triangular shape as shown in FIG. 7 (a) and a rectangular side turbulent flow as shown in FIG. 7 (b). A turbulent flow forming convex portion such as the forming convex portion 18b or a substantially semicircular turbulent flow forming convex portion 18c as shown in FIG. Furthermore, as a turbulent flow forming portion provided on the flow path forming surface 4, as shown in FIG. 8 (a), the flow of air 12 flows through a turbulent flow forming groove 11 and a turbulent flow forming convex portion 18a having a right side triangular shape. FIG. 8B shows a configuration in which side surface rectangular turbulent flow forming grooves 11a and turbulent flow forming convex portions 18b are alternately provided in the flow direction of air 12, as shown in FIG. As shown in (c), the turbulent flow forming groove and the turbulent flow forming groove 11b and the turbulent flow forming convex portion 18c are alternately provided in the air 12 flow direction. You may make it employ | adopt what combined the convex part. 6 (A), (B), (C) to FIG. 8 (A), (B), and (C), the same components as those shown in FIG.

  In addition, this invention is not limited only to the said embodiment, The side surface shape of the drying blocks 3, 3a, 3b is the radial direction of the diameter dimension of the blanket 2 of the blanket roll 1, and the outer peripheral surface of this blanket 2. You may change suitably according to the area of the drying object position set to some.

  The number of turbulent flow forming portions provided on the flow path forming surface 4 of the drying blocks 3, 3 </ b> A, 3 </ b> B is appropriately increased or decreased according to the length of the distance through which the air 12 is circulated along the outer peripheral surface of the blanket 2 in the air flow path 5. May be. In this case, even if the turbulent flow is generated by the turbulent flow forming portion at a position close to the suction ports 6, 6 a, 6 b in the air flow path 5, the turbulent flow is the flow of the air 12 in the air flow path 5. Therefore, the turbulent flow forming portion is formed on the flow path forming surface 4 of the drying block 3 with respect to the air flow path 5. It is desirable to provide at a position corresponding to the upstream side portion in the flow direction of the air 12.

  You may change suitably the size of the turbulent flow formation part provided in the flow-path formation surface 4 of the said drying blocks 3, 3A, 3B according to the flow velocity of the air distribute | circulated through the said air flow path 5. FIG.

  The gaps between the protruding end surfaces of the side plates 13 and the seal portions 15 of the drying blocks 3, 3 </ b> A, 3 </ b> B and the corresponding portions of the outer peripheral surfaces of the blanket roll 1 and the blanket 2 form the flow path of the drying blocks 3, 3 </ b> A, 3 </ b> B. If it is possible to prevent the air 12 from being blown inside and outside by being narrower than the clearance secured to form the air flow path 5 between the surface 4 and the outer peripheral surface of the blanket 2, The dimension of the gap may be appropriately changed in consideration of the shake during rotation due to the manufacturing accuracy of the blanket roll 1 or the blanket 2.

  The arrangement of the roll blanket drying device I according to the present invention is that of the blanket 2 as long as interference between the equipment provided around the blanket roll 1 in the offset printing device and the drying blocks 3, 3A, 3B can be avoided. Any portion other than the upper end portion in the circumferential direction may be used. In this case, the drying blocks 3, 3 </ b> A, 3 </ b> B are placed between the flow path forming surface 4 of the drying blocks 3, 3 </ b> A, 3 </ b> B and the drying target position set at one place in the circumferential direction of the outer peripheral surface of the blanket 2. What is necessary is just to make it provide with the attitude | position which can form the air flow path 5 with a predetermined clearance.

  Of course, various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Roll blanket drying apparatus 1 Blanket roll 2 Blanket 3, 3A, 3B Drying block 4 Flow path formation surface 5 Air flow path 5a, 5b Air intake port 6, 6a, 6b Suction port 9 Suction means 11, 11a, 11b, 11c Flow forming groove (turbulent flow forming part)
12 Air 17 Air supply means 18a, 18b, 18c Turbulent flow forming convex portion (turbulent flow forming portion)

Claims (4)

  A drying block that extends in a direction parallel to the roll axis direction of the blanket roll and has a bottom surface provided on the outer peripheral portion of the blanket roll as a curved flow path forming surface along the outer peripheral surface of the blanket, The outer peripheral surface of the blanket is disposed outside the position to be dried and from the air inlet to the suction port provided on the flow path forming surface of the drying block between the flow path forming surface of the drying block and the blanket. The air flow path for circulating the air along the air flow path is formed, and the air flow enters the air flow path and reaches the suction port, and the flow path forming surface extends in a direction parallel to the roll axis direction. A turbulent flow is generated by the turbulent flow forming portion in the air flow flowing through the air flow path, and the air in the vicinity of the outer peripheral surface of the blanket in the air flow path is stirred. Roll blanket drying apparatus characterized by having a structure formed by a so that.   The roll blanket drying apparatus according to claim 1, wherein the suction port provided in the flow path forming surface of the drying block is formed in a slit shape extending in a direction parallel to the roll axial center direction of the blanket roll, and the suction port is connected to the suction means.   The roll blanket drying apparatus according to claim 1 or 2, wherein an air supply means is connected to an air intake port of the air flow path.   The turbulent flow forming portion is configured by either one of the turbulent flow forming groove and the turbulent flow forming convex portion on the flow path forming surface of the drying block, or the turbulent flow forming groove and the turbulent flow forming convex portion. The roll blanket drying apparatus according to claim 1, 2 or 3, wherein the roll blanket drying apparatus is configured to be provided alternately.

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