JP2017100346A - Drier for transported object, transportation system for transported object and method for drying transported object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to cool a transported object without elongating a path length of the transported object and without enlarging a size of a device.SOLUTION: A dryer 260 comprising: a drying unit 300 which heats a long recording medium W which is wound in a roll form; roller groups 330 which are provided on a recording medium transportation direction downstream side of the drying unit 300, and on which the recording medium W is alternately hung up and down; a dancer roller part 360 which supports the lower side roller group 330, is moved in a vertical direction and absorbs a speed difference between transportation speeds on an upstream side and a downstream side; a first air blower 361 to a fifth air blower 365 which are provided on a lower side with respect to the dancer roller part 360, and blow air in a longer direction of the recording medium W.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a transported object drying apparatus, a transported object transport system, and a transported object drying method.

  A printing device that forms an image on a continuous web as a transported object, a web processing device that performs a prescribed process on the web before or after printing, or a pre- and post-processing device that unwinds and winds a rolled web A transport system having at least one of the above is known. In such a conveyance system, a plurality of web conveyance means often exist on a web conveyance path in the system. In such a case, it is common to dispose a dancer roller device in order to absorb the amount of web slack between the upstream web conveyance means and the downstream web conveyance means, and to apply appropriate tension to the web to be conveyed. Is.

  As a transport device provided with this dancer roller device, for example, techniques described in Japanese Patent Application Laid-Open No. 2013-224205 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2009-73013 (Patent Document 2) are known.

  Among these, Patent Document 1 describes a drive system for a dancer's vertical movement for changing the path length of the long object by changing the position of the dancer roller during conveyance and loading. Patent Document 2 describes a configuration in which tension is applied to a web after printing and drying to eliminate slack.

  In a high-speed inkjet printer using the transport system, it is necessary to heat the web until the web temperature reaches about 120 ° C. in order to dry the ink after printing. By this heating, water / solvent in the ink is evaporated and the ink is dried. Therefore, in this type of transport system, a heating device is provided on the downstream side of the ink jet printer.

  On the other hand, since the color material component in the ink melts when heated by the heating device, it is necessary to cool after heating. Therefore, the heating device is provided with cooling means. However, if the web is not sufficiently cooled after heating and is not below the glass transition point of the molten component (for example, 45 ° C.), the printed ink moves to the facing web where it overlaps, impairing the image quality.

  In order to cool a web heated to a high temperature, it is effective to extend the cooling path length (time). However, if the cooling path length is simply increased, the length of the paper that is crushed in the apparatus becomes longer, This will increase wasted paper. Also, the cooling characteristics depend on the basis weight of the web, and the paper with a higher basis weight becomes more difficult to cool. If the cooling path length is secured according to the maximum specification paper basis weight, unnecessary waste paper including functions will be created for frequently used medium basis weight paper and light basis weight paper. .

  Furthermore, when the web path length is not lengthened and the cooling is attempted, there is a problem that a powerful cooling facility is required, the apparatus is increased in size, and the necessary power needs to be increased.

  However, references 1 and 2 do not mention anything about cooling of these webs.

  Therefore, the problem to be solved by the present invention is to be able to cool the conveyed object without increasing the path length of the conveyed object and without increasing the size of the apparatus.

  In order to solve the above-mentioned problem, the present invention is provided on the downstream side of the heating device in the conveyance direction of the conveyance object, and a heating device that heats a long conveyance object wound in a roll shape, and alternately From a dancer roller unit that supports a group of rollers on which an object to be conveyed is supported, a lower roller group, moves in the vertical direction and absorbs a difference in conveyance speed between the upstream side and the downstream side, and the dancer roller unit And a blower drying apparatus provided with a blower that sends air in the longitudinal direction of the transported object.

  According to the present invention, it is possible to cool the conveyed object without increasing the path length of the conveyed object and without increasing the size of the apparatus. Note that problems, configurations, and effects other than those described above will be clarified in the following description of embodiments.

It is a figure which shows the internal structure of the whole post-drying apparatus which concerns on embodiment of this invention, and is an example in the case of the paper of the largest basic weight. It is a figure which shows the internal structure of the whole post-drying apparatus which concerns on embodiment of this invention, and is an example in the case of the paper of minimum basis weight. FIG. 6 is a characteristic diagram illustrating a change in recording medium temperature with respect to a path length of the recording medium from a guide roller portion of the post-drying apparatus according to the embodiment of the present invention. 1 is a system configuration diagram showing an overall configuration of an image forming system according to an embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  First, the overall configuration of an image forming system according to an embodiment of the present invention will be described. FIG. 4 is a system configuration diagram showing the overall configuration of the image forming system according to the embodiment of the present invention.

  The image forming system 200 according to the present embodiment includes a paper feeding device 210, a processing agent liquid coating device 220, a first inkjet printer 230, a reversing device 240, a second inkjet printer 250, a post-drying device 260, and a winding device 270. Is provided. The paper feeding device 210 holds a recording medium W such as a roll-like continuous continuous paper, and supplies the recording medium W from here to a processing agent liquid coating device 220 provided downstream of the conveyance path of the recording medium W. The treatment liquid application device 220 applies a treatment liquid that suppresses bleeding and show-through of ink printed on the recording medium W to the recording medium W, and then dries the recording medium W coated with the treatment liquid.

  The first ink jet printer 230 forms a desired image by ejecting ink droplets on the front side of the recording medium W coated with the treatment liquid in the treatment liquid coating apparatus 220. The reversing device 240 includes a dryer (drying device) (not shown), dries the image on the front side of the recording medium W formed by the first ink jet printer 230, and reverses the front and back of the recording medium W. The second ink jet printer 250 forms a desired image by ejecting ink droplets on the front side (the back side before reversal) of the recording medium W that has been reversed by the reversing device.

  The post-drying device 260 dries the recording medium W on which images are formed on both sides with a heating roller, as will be described later, and cools the dried paper to dry and fix the ink. The winding device 270 winds the dried recording medium W.

  FIG. 1 is a diagram showing an internal configuration of the entire post-drying device 260, and shows an example in the case of a paper having a maximum basis weight. FIG. 2 is also a diagram showing the internal configuration of the entire post-drying device 260, and shows an example in the case of a paper with the maximum basis weight. In these drawings, the post-drying device 260 includes a drying unit 300 and a roller group 330.

  The drying unit 300 includes a first-stage roller set 40, a second-stage roller set 50, a third-stage roller set 60, a first discharge conveyance roller 70, and a second discharge conveyance roller 71. The first stage roller set 40 includes a first stage front surface heating roller 40a and a first stage back surface heating roller 40b. The second stage roller set 50 includes a second stage front surface heating roller 50a and a second stage back surface heating roller 50b. The third stage roller set 60 includes a third stage front surface heating roller 60a and a third stage back surface heating roller 60b.

  The first-stage roller set 40, the second-stage roller set 50, and the third-stage roller set 60 are arranged side by side from the upstream in the conveyance direction in the conveyance path of the recording medium W. Each heating roller 40a, 40b, 50a, 50a, 50b, 60a, 60b is rotatably supported by a bearing (not shown) at both ends in the longitudinal direction of each roller.

  The first stage surface heating roller 40a and the first stage back surface heating roller 40b, the second stage surface heating roller 50a and the second stage back surface heating roller 50b, the third stage surface heating roller 60a and the third stage back surface heating roller 60b are mutually connected. They are spaced apart and arranged in a staggered pattern.

  The roller group 330 includes a first guide roller 331, a second guide roller 332, a third guide roller 333, a fourth guide roller 334, and a dancer roller unit 360. The dancer roller unit 360 includes a first dancer roller 336, a second dancer roller 337, a third dancer roller 338, and a fourth dancer roller 339 installed on a movable frame 335 that can move in the vertical direction. In addition, position detection means (not shown) for detecting the position of the dancer roller unit 360 is installed in the roller group 330. The dancer roller unit 360 is configured to apply tension to the recording medium W by its own weight. The recording medium W is alternately wound up and down between the first to fourth guide rollers 331, 332, 333 and 334 and the first to fourth rollers 336, 337, 338 and 339.

  The rotational speed of the feed roller 340 is changed based on the output of the position detecting means for detecting the position of the dancer roller unit 360, and the vertical position of the dancer roller unit 360 can be controlled. Thereby, the transport buffer amount of the recording medium W between the post-drying device 260 and the feed nip roller portion 350 of the second inkjet printer 250 is ensured, and tension is applied to the recording medium W. Therefore, a control device 355 that controls the rotational speed of a motor (not shown) that drives the feed roller 340 is provided in the feed nip roller portion 350. The transport buffer amount is the length in the transport direction necessary for applying tension to the recording medium W, and is determined by the transport length that changes according to the height position of the dancer roller unit 360.

  Below the movable frame 335, a first blower 361, a second blower 362, a third blower 363, a fourth blower 364, and a fifth blower 365 are installed to send wind in the longitudinal direction of the paper. Accordingly, it is possible to blow air over the entire length of the sheet, and the recording medium W can be cooled in the space of the dancer roller unit 360, and the space can be used effectively.

  The first blower 361 to the fifth blower 365 are fixed to the movable frame 335 and move together with the dancer roller unit 360. For this reason, the distance between the lower surface of the recording medium W and the first blower 361 to the fifth blower 365 is constant, and the sheet can be effectively cooled without a decrease in the amount of blown air.

A feed roller 340 that is driven to rotate and a feed nip roller 341 that elastically holds the recording medium W between the feed roller 340 and the feed roller 340 are provided at a downstream portion of the recording medium W. It passes between the feed roller 340 and the feed nip roller 341, passes through the idler roller 342, and is conveyed to the winding device 270. In the image forming system 200 according to the present embodiment, for example, the printing speed is 50 m / min, and the basis weight of the corresponding recording medium W is 40 to 250 g / m ² .

  The recording medium W upstream of the first guide roller 331 is heated to 120 ° C. by the drying unit 300. This heating evaporates the solvent in the ink and softens the resin component in the ink. Thereafter, the recording medium W is blown by the first blower 361 to the fifth blower 365 in the longitudinal direction of the recording medium W and passes through the idler roller 342 while being forcibly cooled. The temperature after passing is 45 ° C. or less. The melting point of the ink component used in this embodiment is 50 ° C., and the component softened by heat is solidified by this cooling.

  FIG. 3 is a characteristic portion showing a change in the temperature of the recording medium W with respect to the path length of the recording medium W from the guide roller 331.

In the figure, P1 is a basis weight of 250 g / m ² , P2 is a basis weight of 130 g / m ² , and P3 is a ventilation cooling path length (m) when the basis weight is 40 g / m ² , that is, a roller The paper length passing through the group 330 is shown.

From this result, in order for the recording medium W temperature to be 45 ° C. or less after passing through the idler roller 342, the distance from the guide roller 331 to the idler roller 342 is 16 m or more at a basis weight of 250 g / m ² (maximum apparatus specification). It is necessary to. On the other hand, in the case of a paper having a basis weight of 40 g / m ² , the distance from the guide roller 331 to the idler roller 342 can be cooled by about 2 m, and when the versatility is 130 g / m ² , it can be cooled by about 8 m. It becomes.

  In the present embodiment, the vertical position of the movable frame 335 is changed according to the basis weight information of the recording medium W, and the recording medium W can be cooled to a temperature of 45 ° C. or less when passing through the idler roller 342. The route length is configured. That is, since the cooling path length corresponding to the basis weight of the recording medium W can be taken, a useless path length for cooling the recording medium W can be omitted.

  Also, a paper temperature measurement sensor 343 is installed in the paper path immediately after the idler roller 342, and the movable frame 335 is moved up and down by controlling the rotation speed of the feed roller 340 so that the output value of the paper temperature measurement sensor is 45 ° C. or less. It is also possible to move in the direction.

  Furthermore, the recording medium length for absorbing the speed difference of the recording medium W by the first dancer roller 336 to the fourth dancer roller 339 in the image forming system according to the present embodiment is a feed after the second inkjet printer 250 is stopped. The distance that the roller 340 can stop is 2 m. This distance of 2 m can also be used for cooling. In addition, the feed nip roller 341 is controlled so as to ensure 2 m regardless of the paper basis weight and temperature, and the speed difference that is the original function of the first dancer roller 336 to the fourth dancer roller 339 can be absorbed. It has become. Thereby, waste of a conveyed product can be prevented.

  As described above, according to the present embodiment, the following effects can be obtained. In the following description, each degree of structural use in the claims corresponds to each part in the present embodiment, and when the terminology is different, the latter is shown in parentheses.

    (1) A transported object drying apparatus (post-drying apparatus 260) according to the present embodiment includes a heating device (drying unit 300) that heats a long transported object (recording medium W) wound in a roll shape, A roller group 330 provided on the downstream side in the transported object transport direction of the heating device and supporting the transported object alternately up and down, and supporting the lower roller group, moving in the vertical direction, and upstream A dancer roller 360 that absorbs the speed difference between the downstream conveyance speeds and a blower device (first blower 361 to first fan) that is provided below the dancer roller 360 and sends wind in the longitudinal direction of the object to be conveyed. 5 blower 365), the conveyance path for absorbing the speed difference of the object to be conveyed can also be used as a cooling unit, without increasing the path length of the object to be conveyed, and , Enlarge the equipment Ku can be cooled transported object. In addition, waste of the conveyed object can be prevented and the apparatus can be prevented from being enlarged.

    (2) In the transported object drying apparatus (post-drying apparatus 260) according to (1), the movement position of the dancer roller unit 360 in the vertical direction depends on the transport buffer amount for absorbing the speed difference and the transported object. Since this is a position where the amount of the transport buffer for cooling the object is secured, the cooling performance can be secured and the image quality can be stabilized.

    (3) In the transported object drying apparatus (post-drying apparatus 260) according to (2), the transport buffer amount for cooling is set according to the weight of the transported object, so that it is appropriate for each basis weight. The cooling path length can be reduced, and web waste can be prevented.

    (4) In the transported object drying apparatus (post-drying apparatus 260) according to (2) or (3), a temperature at which the temperature of the transported object is detected downstream of the dancer roller unit 360 in the transported object transport direction. A detecting means (paper temperature measuring sensor 343) is provided, and the amount of the transport buffer for cooling is set based on the temperature detected by the temperature detecting means, so that it is possible to cool even when the temperature environment is different. The transfer buffer amount can be set appropriately, and waste of the transferred object can be prevented.

    (5) In the transported object drying apparatus (post-drying apparatus 260) according to any one of (1) to (4), the blower (first blower 361 to fifth blower 365) is attached to the dancer roller unit 360. Therefore, it can move up and down together with the dancer roller, and the air volume of the blower can be used for cooling the conveyed object without waste. Moreover, size reduction of an air blower can be achieved.

    (6) A transported object drying apparatus (post-drying apparatus 260) according to any one of (1) to (5) and a front stage of the transported object drying apparatus, and set in advance for the transported object. According to the transported object transport system including the processing device (second ink jet printer 250) that performs the above processing, the transported object is heated and cooled after the preset processing is performed, Can be transported.

    (7) In the transported object transport system according to (6), after the preset process has performed a process of ejecting liquid and adhering to the transported object (for example, a printing process by the ink jet printer 250), heating Then, the liquid (for example, ink) can be melted, and then cooled and fixed to the object to be conveyed. Thereby, the liquid (for example, ink) can be transferred (blocked) to an object to be transported, or the liquid (ink) can be prevented from being transferred (picked) to a roller member such as a transport roller.

    (8) In the transported object drying apparatus (post-drying apparatus 260) according to the present embodiment, the following transported object drying method is executed. In this transported object drying method, a long transported object (recording medium W) wound in a roll shape is heated by a drying device (drying unit 300), and downstream of the heated device in the transported object transport direction. A dancer roller unit 360 that is provided and supports a lower roller group on which the object to be conveyed is alternately mounted is moved in the vertical direction to absorb the speed difference between the upstream and downstream transport speeds. Since the air blower (the first air blower 361 to the fifth air blower 365) provided below the dancer roller portion 360 sends wind in the longitudinal direction of the object to be conveyed, the path length of the object to be conveyed The object to be conveyed can be cooled without increasing the length of the apparatus and without increasing the size of the apparatus.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention, and all technical matters included in the technical idea described in the claims are included. The subject of the present invention. The above-described embodiments show preferred examples, but those skilled in the art can realize various alternatives, modifications, variations, and improvements from the contents disclosed in the present specification. These are included in the technical scope described in the appended claims.

DESCRIPTION OF SYMBOLS 200 Image forming system 210 Paper feeder 220 Processing agent liquid coating device 230 1st inkjet printer 240 Inversion device 250 2nd inkjet printer 260 Post-drying device 270 Winding device 300 Drying unit 330 Roller group 335 Movable frame 340 Feed roller 341 Feed nip roller 350 Feed nip roller portion 360 Dancer roller portion 361 First blower 362 Second blower 363 Third blower 364 Fourth blower 365 Fifth blower

JP 2013-224205 A JP 2009-073013 A

Claims (8)

A heating device for heating a long object to be wound wound in a roll;
A roller group provided on the downstream side of the heating device in the transport direction of the transported object, and on which the transported object is alternately hung up and down,
A dancer roller unit that supports the lower roller group, moves in the vertical direction, and absorbs the speed difference between the upstream and downstream transport speeds;
An air blower that is provided below the dancer roller section and sends wind in the longitudinal direction of the object to be transported;
A transported object drying apparatus comprising: The transported object drying apparatus according to claim 1,
The transported object drying device is a position in which the movement position of the dancer roller portion in the vertical direction secures a transport buffer amount for absorbing the speed difference and a transport buffer amount for cooling the transported object. It is a conveyed product drying apparatus of Claim 2, Comprising:
A transported object drying apparatus in which a transport buffer amount for cooling is set according to a weighing amount of the transported object. It is a conveyed product drying apparatus of Claim 2 or 3,
A temperature detecting means for detecting the temperature of the transported object downstream of the dancer roller unit in the transported object transport direction;
The transported object drying apparatus in which the transport buffer amount for cooling is set based on the temperature detected by the temperature detecting means. It is a conveyed product drying apparatus of any one of Claims 1 thru | or 4, Comprising:
A transported object drying apparatus in which the blower is attached to the dancer roller unit. The transported object drying apparatus according to any one of claims 1 to 5,
A processing apparatus that is provided in a preceding stage of the transported object drying apparatus and that performs a preset process on the transported object;
To-be-conveyed object conveyance system. It is a to-be-conveyed object conveyance system of Claim 6, Comprising:
The transported object transport system, wherein the preset process is a process of discharging a liquid to adhere to the transported object. A long transported object wound in a roll is heated by a heating device,
A dancer roller portion, which is provided on the downstream side of the heating device in the conveyance direction of the conveyed object and supports the lower roller group of the roller group on which the conveyed object is alternately mounted, is moved in the vertical direction and Absorbs the difference in transport speed on the downstream side,
A transported object drying method in which air is sent in the longitudinal direction of the transported object and cooled by a blower provided below the dancer roller unit.