JP2011161737A - Web conveying apparatus and printing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inhibit that a solvent which has evaporated re-adheres on the surface which is conveyed from a dryer and has been applied with a coating liquid containing a solvent on the surface, and thereby a coating surface suffers a loss in a web conveying apparatus and a printing machine. <P>SOLUTION: A web conveying apparatus and a printing machine includes a sheet feeder, an in-feed apparatus, a printer, a dryer 14, a cooling device 15, a web pass apparatus, a folding device, and a paper ejection apparatus, wherein a guide roller 25 which winds and guides a web W dried by the dryer 14, is prepared, and a heater 31 which heats the guide roller 25 to a predetermined temperature based on a temperature of the web W ejected from the dryer 14, is provided. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a web conveyance device that conveys a printed and dried web by a guide roll, and a printing machine equipped with the web conveyance device.

  In general, an offset rotary printing press includes a paper feeding device, an infeed device, a printing device, a drying device, a cooling device, a web pass device, a folding device, and a paper discharge device. Accordingly, the web is pulled out from the winding body by the paper feeding device, the web is supplied to the printing device with a predetermined tension by the infeed device, and the multicolor printing is performed and printed by each printing unit in the printing device. The web is dried by a drying device, cooled by a cooling device, conveyed through a web pass device, cut and folded by a folding device, and then a crease is created and carried out by a paper discharge device. .

  By the way, in the offset rotary printing press described above, the printed web is dried by drying the transferred ink with hot air in a drying device and transporting it while contacting a plurality of cylinders with a cooling device. Later excess heat is cooled. In this case, in the drying device, the ink is dried by blowing warm air on the printing surface (transferred ink) of the web. At this time, the solvent contained in the ink becomes vapor, and the solvent vapor is Accompanying the running of the web flows into the cooling device. In the cooling device, the web printing surface is brought into contact with the cylinder for cooling, so that the solvent vapor from the drying device stays around the contact portion between the web printing surface and the cylinder outer peripheral surface. At this time, the solvent vapor is cooled. Is condensed and adheres to the printing surface. Then, the transferred ink is dissolved on the printed surface of the web to which the solvent vapor is adhered, and when the printed surface of the web comes into contact with the outer peripheral surface of the next cylinder, the dissolved ink adheres to the surface of the cylinder. While printing defects occur, the cylinders become dirty and hinder web conveyance.

  As a technique for preventing condensation that occurs on the surface of the cooling cylinder when the web that has passed through the drying device is cooled by the cooling device, for example, there is one described in Patent Document 1 below. In the control method of the chill roll system described in Patent Document 1, when the web is cooled while contacting the chill roll of the chill roll system, the dew point temperature of the ink solvent vapor is calculated based on the web inlet temperature, Using the heat transfer model, the temperature of the inflow coolant is set slightly lower than the dew point temperature.

JP 2003266664 A

  In the control method of the conventional chill roll system described above, the temperature of the coolant flowing in to cool the chill roll is set slightly lower than the dew point temperature of the vapor of the solvent of the ink, so that the surface of the cooling cylinder To prevent condensation. However, even if the temperature of the coolant, that is, the temperature of the chill roll contacting the web is controlled in this way, as a result, a temperature difference occurs between the dried web and the chill roll that contacts and cools the web. The web is cooled below the dew point temperature and condensation can occur. In addition, if the temperature difference between the web and the chill roll is reduced, the cooling efficiency of the web will decrease, and in order to cool the web to a predetermined temperature, a large number of chill rolls and a long cooling time are required, resulting in a reduction in production cost. The problem of end up occurs.

  The present invention solves the above-described problems, and prevents the coated surface from being lost due to re-adhesion of the evaporated solvent onto the surface that is conveyed from the drying apparatus and coated with the coating liquid containing the solvent. An object of the present invention is to provide a web conveyance device and a printing press.

  In order to achieve the above object, a web transport apparatus according to the present invention includes a web transport apparatus for transporting a web dried by a drying apparatus while being wrapped around a rotatable cooling cylinder, and cooling the web. A guide unit that winds and guides the web between and a heating unit that heats the guide unit to a predetermined temperature based on the temperature of the web discharged from the drying device is provided. .

  Therefore, when the web discharged from the drying apparatus reaches the guide portion with solvent vapor accompanying the surface, the solvent vapor enters between the web and the guide portion, but this guide portion is heated. The solvent vapor between the web and the guide part is transported as a gas without condensing here, and is released from the web and the guide part when the web is separated from the guide part, and is transported from the drying device. It is possible to suppress the adverse effect of the solvent vapor accompanying the web on the web and improve the quality of the coated surface on which a coating liquid such as ink or aqueous varnish is applied.

  In the web conveyance device of the present invention, the predetermined temperature is a temperature equal to or higher than the temperature of the web discharged from the drying device.

  Therefore, by heating the guide section above the temperature of the dried web with the heating section, the solvent vapor accompanying the web does not become lower than the condensation temperature, and the damage to the printed surface of the web due to condensation of the solvent vapor is suppressed. can do.

  In the web conveyance device of the present invention, the guide portion is a rotatable guide roller disposed downstream of the drying device.

  Therefore, by making the guide part a rotatable guide roller, it is possible to suppress damage to the printing surface of the web due to contact between the web and the guide roller.

  In the web conveyance device of the present invention, the cooling cylinder is configured by a plurality arranged in series so that the front surface and the back surface of the web are alternately wound, and the cooling roller on the most upstream side is used as the guide roller. It is a feature.

  Therefore, by using the guide roller as the most upstream side cooling cylinder, it is possible to suppress an increase in the size of the apparatus and an increase in manufacturing cost.

  In the web conveyance device of the present invention, the heating unit is provided inside the guide member.

  Therefore, by providing the heating unit inside the guide unit, it is possible to suppress an increase in the size of the device and to simplify the arrangement.

  In the web conveyance device of the present invention, the heating unit is provided to face the outer surface of the guide member.

  Therefore, by providing the heating unit separately from the guide unit, it is possible to simplify the guide unit and improve the ease of arrangement of the heating unit.

  In the web conveyance device of the present invention, the guide portion is a non-rotatable guide roller disposed between the drying device and the cooling cylinder, and the web floating portion floats the web from the circumferential surface of the guide roller. Is provided.

  Accordingly, it is not necessary to rotate the guide roller, the support mechanism can be simplified, and the web floating portion is provided to suppress damage to the print surface of the web due to contact between the web and the guide roller. be able to.

  In the web conveyance device of the present invention, the web floating unit is an air injection unit that injects air from the inside of the guide roller toward the web, and the heating unit is heated air that is injected from the air injection unit. It is characterized by being.

  Therefore, by sharing the web floating portion and the heating portion, it is possible to prevent the apparatus from becoming large and simplify the structure.

  Further, the printing machine of the present invention dries the web fed from the web, the printing device that prints the web fed from the paper feeding device, and the web printed by the printing device. A drying device, a cooling device that winds and cools the web dried by the drying device around a cooling cylinder, a folding device that forms a fold by cutting and bending the web cooled by the cooling device, and the folding device. In a printing machine comprising: a paper discharge device that discharges a signature formed by the device, a guide unit that winds and guides a web between the drying device and the cooling cylinder; and the guide unit is used as the drying device. And a heating unit that heats the web to a predetermined temperature based on the temperature of the web discharged from the web.

  Accordingly, the web is supplied to the printing device by the paper feeding device, where printing is performed, and the printed web is dried and discharged by the drying device. At this time, when the web discharged from the drying apparatus reaches the guide portion with solvent vapor on the surface, the solvent vapor enters between the web and the guide portion, but the guide portion is heated. Thus, the solvent vapor between the web and the guide part is not condensed here but is transferred in the form of gas, and is detached from the web and the guide part when the web is separated from the guide part. Thereafter, the web is cooled by a cooling device, cut by a folding device and folded to form a fold, and is discharged by a paper discharge device. As a result, it is possible to suppress the adverse effect of the solvent vapor accompanying the web on the web conveyed from the drying device, and to improve the quality of the coated surface coated with a coating liquid such as ink or aqueous varnish. Can do.

  According to the web conveyance device and the printing machine of the present invention, the guide unit that winds and guides the web between the drying device and the cooling cylinder, and the guide unit is a predetermined temperature based on the temperature of the web discharged from the drying device. In addition, the quality of the coated surface on which coating liquid such as ink or aqueous varnish is applied to the web transported from the drying device is suppressed. Can be improved.

FIG. 1 is a schematic diagram illustrating a web conveyance device according to a first embodiment of the present invention. FIG. 2 is a schematic configuration diagram illustrating a commercial offset rotary printing press as a printing press on which the web conveyance device of Example 1 is mounted. FIG. 3 is a schematic diagram illustrating a web conveyance device according to a second embodiment of the present invention. FIG. 4 is a cross-sectional view illustrating a guide roller in the web conveyance device according to the second embodiment. FIG. 5 is a schematic diagram illustrating a web conveyance device according to a third embodiment of the present invention.

  Exemplary embodiments of a web conveyance device and a printing press according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this Example.

  FIG. 1 is a schematic diagram illustrating a web conveyance device according to a first embodiment of the present invention, and FIG. 2 is a schematic configuration diagram illustrating a commercial offset rotary printing press as a printing machine equipped with the web conveyance device according to the first embodiment. It is.

  The printing press of Example 1 is a commercial rotary offset printing press, and as shown in FIG. 2, a paper feeding device 11, an infeed device 12, a printing device 13, a drying device 14, and a cooling device 15. And a web pass device 16, a folding device 17, and a paper discharge device 18.

  The paper feeding device 11 has a reel stand on which two winding bodies (web rolls) are mounted, and the web W that has been drawn out of one winding body and travels is transferred to the other winding body. By connecting to the web W, the web W can be continuously supplied. The in-feed device 12 supplies the web W fed from the paper feeding device 11 to the printing device 13 side. The printing apparatus 13 includes four printing units 21, 22, 23, and 24 for four ink colors, ie, Cyan, Magenta, Yellow, and Black, along the web running direction. Are arranged side by side. Each printing unit 21, 22, 23, 24 can perform printing on both surfaces (front surface and back surface) of the traveling web W.

  The drying device 14 is for drying the ink on the web W printed by the printing device 13, and blows warm air on the upper and lower surfaces of the printed web W to dry the ink. can do. The cooling device 15 cools the web W that stores excessive heat after drying in the drying device 14 to an appropriate temperature, and a plurality of (four in this embodiment) cooling that winds and cools the web W. Cylinders 25, 26, 27, and 28 are provided. The cooling cylinders 25, 26, 27, and 28 can cool the web W that is in contact with each other by circulating cooling water therein. The web pass device 16 conveys the dried and cooled web W, and the folding device 17 cuts the web W after being vertically folded and folds it to a predetermined size to form a fold. The paper discharge device 18 carries out the folded signatures out of the apparatus.

  Accordingly, the web W is pulled out from the winding body by the paper feeding device 11 and supplied to the printing device 13 by the infeed device 12. Printing is performed, and the printed web W is dried by warm air in the drying device 14 and cooled by contacting each cooling cylinder 25, 26, 27, 28 of the cooling device 15, and the web pass device 16. A fold is created by the folding device 17 transported through the sheet, and is carried out by the paper discharge device 18.

  By the way, the ink used in the printing apparatus 13 of such a commercial web offset printing press contains a solvent. For example, oil-based inks and water-based inks are generally formed with pigments, ink resins, petroleum-based solvents or water-soluble solvents, additives, and the like as main components. Then, the web W printed by the printing device 13 is dried with warm air by the drying device 14, and is in contact with the cooling cylinders 25, 26, 27, 28 by the cooling device 15. The excess heat after drying is cooled by being conveyed. At this time, in the drying device 14, when the ink of the web W is dried, the solvent contained in the ink is generated as a vapor, and the solvent vapor flows along with the traveling of the web W toward the cooling device 15. Then, in the cooling device 15, the solvent vapor is cooled and condensed, adheres to the printing surface of the web W, dissolves the ink on the printing surface, and deteriorates the printing quality.

  Therefore, in the first embodiment, the drying device 14 is a web transport device that transports the web W dried by the drying device 14 while being wound around the cooling cylinders 25, 26, 27, and 28 in the rotatable cooling device 15 and cooled. Since the evaporated solvent is reattached to the surface that is transported from the surface and the coating liquid containing the solvent is applied to the surface, the coating surface is prevented from being lost, thereby preventing adverse effects on the printing surface. It is possible to improve.

  In the web conveyance device of the first embodiment, as shown in FIG. 1, a guide portion that winds and guides the web between the drying device 14 and the plurality of cooling cylinders 25 to 28 in the cooling device 15, and this guide portion is dried. And a heating unit that heats the web W to a predetermined temperature based on the temperature of the web W discharged from the apparatus 14.

  That is, in this embodiment, the guide portion is a rotatable guide roller disposed downstream in the conveyance direction of the web W from the drying device 14, and this guide roller is the web W constituting the cooling device 15. A cooling cylinder 25 located on the most upstream side in the transport direction is used. In this embodiment, since the cooling cylinder is used as a guide roller (guide member), it is expressed as a guide roller 25.

  The guide roller (cooling cylinder) 25 has substantially the same shape as the cooling cylinders 26, 27, and 28, and can be driven and rotated in synchronization with the direction indicated by the white arrow in FIG. The guide roller 25 is equipped with a heater 31 as a heating unit, and the guide roller 25 is heated by the heater 31 from the inside, so that the outer peripheral surface is based on the temperature of the web W discharged from the drying device 14. Further, it can be heated to a predetermined temperature, specifically, a temperature equal to or higher than the temperature of the web W.

  On the other hand, each of the cooling cylinders 26, 27, 28 is provided with circulation portions 26a, 27a, 28a for circulating the cooling medium therein, and can supply or circulate a cooling medium at a predetermined temperature from a cooling medium supply source (not shown). It has become.

  The ink transferred to the web W is heated in the drying device 14 and dried, so that the solvent contained in the ink is generated as vapor. And the web W discharged | emitted from the drying apparatus 14 is 120 to 130 degreeC, for example, and solvent vapor | steam will accompany a surface and a back surface. At this time, the web W is first wound on the outer peripheral surface of the guide roller 25 on the lower surface (for example, the back surface) side, and then the upper surface (for example, the front surface) side is wound on the cooling cylinder 26, and the lower surface side and the upper surface side are further wound. It is wound around the outer peripheral surface of the cooling cylinders 27 and 28 and conveyed.

  Therefore, in the high-temperature web W discharged from the drying device 14, the solvent vapor attached to the upper surface side flows upward and leaves the web W as it is, but the solvent vapor attached to the lower surface side is removed from the guide roller. It is caught between 25 outer peripheral surfaces. Then, when the web W is cooled here as in the prior art, the solvent vapor condenses and adheres to the printing surface, which is the lower surface of the web W, and the ink dissolves and printing defects occur. .

  However, in this embodiment, the guide roller 25 is heated and maintained at a temperature substantially equal to the temperature of the web W discharged from the drying device 14 by the internal heater 31. Therefore, in the high-temperature web W discharged from the drying device 14, the solvent vapor attached to the lower surface side is caught between the outer peripheral surface of the guide roller 25, but is not condensed during this time and is transferred as a gas. The Then, when the web W is separated from the guide roller 25, the solvent vapor existing during this time is separated from the web W. As a result, no printing defect occurs on the printing surface of the web W due to the condensation of the solvent vapor.

  Specifically, it is desirable that the outer peripheral surface of the guide roller 25 is heated to 120 ° C. to 150 ° C. by the internal heater 31 and maintained within this temperature range. The web W is preferably cooled to about 30 ° C. by the cooling device 15. Therefore, each of the cooling cylinders 26, 27, and 28 is cooled by circulating a cooling medium therein, but it is desirable to control the temperature of the cooling medium at 10 ° C. to 30 degrees. In this case, it is desirable to set the temperature of the cooling medium in consideration of not only the temperature of the cooling medium but also the winding amount (winding angle) of the web W around each cooling cylinder 26, 27, 28.

  Here, the operation of the web conveyance device according to the first embodiment will be described.

  The web W that has been printed is dried with warm air blown onto the upper and lower surfaces (front surface and back surface) by the drying device 14, and is transported to the cooling device 15 via the guide roller 25. At this time, in the drying device 14, when the ink transferred to the web W is dried, the solvent contained in the ink is evaporated, and the solvent vapor flows to the guide roller 25 and the cooling device 15 side along with the traveling of the web W. .

  That is, the web W transported from the drying device 14 to the cooling device 15 entrains ambient air including solvent vapor by the airflow generated by the running, generates the airflow A on the upper surface side, and the airflow on the lower surface side. B is generated. The solvent vapor stream A accompanying the upper surface of the web W flows upward and leaves the web W as it is. On the other hand, the airflow B of the solvent vapor accompanying the lower surface side of the web W is caught between the outer peripheral surface of the guide roller 25 maintained at a high temperature. However, since the outer peripheral surface of the guide roller 25 is maintained at a higher temperature than the web W by the heater 31, the solvent vapor caught between the web W and the outer peripheral surface of the guide roller 25 is condensed here. It is transported as a gas instead. Then, when the guide roller 25 rotates and separates from the web W, the solvent vapor existing during this time is separated from the web W and the guide roller 25 together with the air flow C generated by the conveyance of the web W and the rotation of the guide roller 25. To do.

  Thereafter, the web W is conveyed while being wound around the cooling cylinders 26, 27, 28 in the cooling device 15 in order from the guide roller 25, so that the front and back surfaces are in contact with the outer peripheral surfaces of the cooling cylinders 26, 27, 28. And cooled to a predetermined temperature. As a result, the solvent vapor accompanying from the drying device 14 does not condense on the web W and adhere to the printing surface (the front surface and the lower surface), and a decrease in printing quality is prevented.

  As described above, in the web conveyance device and the printing press according to the first embodiment, the paper feeding device 11, the infeed device 12, the printing device 13, the drying device 14, the cooling device 15, the web pass device 16, the folding device 17, and the discharge device 17. A paper roller 18, a guide roller 15 for winding and guiding the web W dried by the drying device 14, and a guide roller 25 having a predetermined temperature based on the temperature of the web W discharged from the drying device 14. A heater 31 for heating is provided.

  Accordingly, when the web W discharged from the drying device 14 reaches the guide roller 25 with the solvent vapor accompanying the surface, the solvent vapor enters between the web W and the outer peripheral surface of the guide roller 25. Since the guide roller 25 is heated, the solvent vapor between the web W and the outer peripheral surface of the guide roller 25 is not condensed here and is transferred as a gas, and the web W is separated from the guide roller 25. The web W and the guide roller 25 are separated from each other, and the adverse effect of the solvent vapor accompanying the web W is suppressed on the web W conveyed from the drying device 14, and a coating liquid such as ink or aqueous varnish is applied. The quality of the applied surface can be improved.

  In the web conveyance device of the first embodiment, the predetermined temperature based on the temperature of the web W is set to a temperature equal to or higher than the temperature of the web W discharged from the drying device 14. Therefore, by heating the guide roller 25 to a temperature equal to or higher than the temperature of the dried web W by the heater 31, the solvent vapor accompanying the web W does not become lower than the condensation temperature, and the printing surface of the web W due to the condensation of the solvent vapor. Damage can be suppressed.

  In the web conveyance device according to the first embodiment, the guide roller 25 is rotatably supported, so that damage to the print surface of the web W due to contact between the web W and the guide roller 25 can be suppressed. Moreover, in the web conveyance apparatus of Example 1, by providing the heater 31 inside the guide roller 25, the enlargement of the apparatus can be suppressed and the arrangement can be simplified.

  In the web conveyance device of the first embodiment, the cooling device 15 is configured by arranging a plurality of cooling cylinders 25, 26, 27, and 28 in series so that the front surface and the back surface of the web W are alternately wound, and the guide The most upstream cooling cylinder 25 is used as a roller. Therefore, by using the guide roller as the cooling cylinder 25 on the most upstream side, it is possible to suppress an increase in the size of the apparatus and to suppress an increase in manufacturing cost.

  In addition, in Example 1, although the heating part was used as the heater provided in the guide roller 25, it is not limited to this structure. The heating unit may be, for example, a hot air blower that blows warm air from inside or outside the guide roller 25, or a circulation unit that circulates a high-temperature medium (for example, high-temperature oil) inside the guide roller 25. .

  In the cooling device 15, the number of the cooling cylinders 26, 27, and 28 is three, but the number is not limited to two, and may be two or less or four or more.

  FIG. 3 is a schematic diagram illustrating a web conveyance device according to a second embodiment of the present invention, and FIG. 4 is a cross-sectional view illustrating a guide roller in the web conveyance device according to the second embodiment. Note that members having the same functions as those of the above-described embodiments are denoted by the same symbols, and detailed description thereof is omitted.

  In the printing machine of the second embodiment, as shown in FIGS. 3 and 4, the drying device 14 is provided with a cooling device 41 on the downstream side, and the cooling device 41 is dried after drying by the drying device 14. The web W that stores excess heat is cooled to an appropriate temperature, and has a plurality of (in this embodiment, five) cooling cylinders 42, 43, 44, 45, and 46 for winding and cooling the web W. ing. The cooling cylinders 42, 43, 44, 45, 46 have cooling water circulated therein, and the web W that comes into contact can be cooled by alternately winding the front and back surfaces of the web W.

  In the second embodiment, the web W dried by the drying device 14 is wound around the cooling cylinders 42, 43, 44, 45, 46 in the rotatable cooling device 41 and is conveyed while being cooled. A guide roller 51 as a guide unit for winding and guiding the web between the cooling cylinder 41 and the cooling cylinder 42 in the cooling device 41, a web floating unit for floating the web W from the outer peripheral surface of the guide roller 51, and the guide roller 51 as a drying device. A hot air mechanism 52 is provided as a heating unit that heats the web W to a predetermined temperature based on the temperature of the web W discharged from 14.

  The guide roller 51 is located between the drying device 14 and the cooling cylinder 42 and is fixed to a predetermined position so as not to rotate. And this guide roller 51 is equipped with the warm air mechanism 52 as a web floating part and a heating part inside. That is, the guide roller 51 has an outer cylinder 53 and an inner cylinder 54 that are concentric. The outer cylinder 53 has a large number of injection holes 55 formed in an area (angle range) for guiding the web W, while the inner cylinder 54 has through holes 56 corresponding to positions where the large number of injection holes 55 are formed. Is formed. And the outer cylinder 53 and the inner cylinder 54 form the air injection part 58 by fixing a pair of partition plate 57 along a radial direction between them. The inner cylinder 54 is connected to a heating air supply pipe (not shown) at an end in the longitudinal direction.

  Therefore, when heated air is supplied into the inner cylinder 54, the heated air is supplied from the through hole 56 to the air injection unit 58 and is injected outward from each injection port 55 of the outer cylinder 53. The web W can be suspended from the outer peripheral surface of the guide roller 51 (outer cylinder 53). At this time, the guide roller 51 (outer cylinder 53) is heated by the heated air, so that the outer peripheral surface has a predetermined temperature based on the temperature of the web W discharged from the drying device 14, specifically, this web. Heating to a temperature equal to or higher than the temperature of W is possible.

  Accordingly, the web W on which printing has been completed is dried by warm air blown on the upper and lower surfaces (front surface and back surface) by the drying device 14, and is conveyed to the cooling device 41 via the guide roller 51. . At this time, in the drying device 14, when the ink transferred to the web W is dried, the solvent contained in the ink evaporates, and the solvent vapor flows into the guide roller 51 side as the web W travels.

  That is, the web W transported from the drying device 14 entrains ambient air including solvent vapor by the airflow generated by the traveling, and generates the airflow A on the upper surface side and the airflow B on the lower surface side. . When the web W reaches the guide roller 51, the web W is conveyed in a state of floating from the outer peripheral surface of the guide roller 51 by the heated air ejected from each ejection port 55. At this time, the airflow B of the solvent vapor accompanying the lower surface side of the web W is caught between the heated guide roller 51 and the outer peripheral surface. However, since the outer peripheral surface of the guide roller 51 is heated to a temperature higher than that of the web W by the heated air, the solvent vapor caught between the web W and the outer peripheral surface of the guide roller 51 is condensed here. It is transported as a gas instead. When the web W is transported and separated from the guide roller 51, the solvent vapor existing during this time is separated from the web W and the guide roller 51 together with the airflow C generated by the transport of the web W.

  Thereafter, the web W is conveyed while being wound around the cooling cylinders 42 to 46 in the cooling device 41 in order from the guide roller 51, so that the front surface and the back surface are cooled to a predetermined temperature. As a result, the solvent vapor accompanying from the drying device 14 does not condense on the web W and adhere to the printing surface (the front surface and the lower surface), and a decrease in printing quality is prevented.

  As described above, in the web conveyance device according to the second embodiment, the guide roller 51 that winds and guides the web W dried by the drying device 14 is provided, and the web that floats the web W from the outer peripheral surface of the guide roller 51 is provided. A hot air mechanism 52 that functions as a heating unit that heats the floating part and the guide roller 51 to a predetermined temperature based on the temperature of the web W discharged from the drying device 14 is provided.

  Accordingly, when the web W discharged from the drying device 14 reaches the guide roller 51 with the solvent vapor accompanying the surface, the web W is conveyed and supported in a state of being floated by the heated air sprayed from the outer peripheral surface, and the solvent. Steam enters between the web W and the outer peripheral surface of the guide roller 51. Since the guide roller 51 is heated, the solvent vapor between the web W and the outer peripheral surface of the guide roller 51 is condensed here. When the web W is separated from the guide roller 51, the web W and the guide roller 51 are separated from each other, and the web W conveyed from the drying device 14 is accompanied by the web W. The adverse effect due to the solvent vapor is suppressed, and the quality of the coated surface on which the coating liquid such as ink or aqueous varnish is coated can be improved.

  In the web conveyance device of the second embodiment, the guide roller 51 is made non-rotatable, and the guide roller 51 is rotated by providing a hot air mechanism 52 as a web floating portion that floats the web from the peripheral surface of the guide roller 51. This eliminates the need for simplification of the support mechanism and suppresses damage to the printing surface of the web W due to contact between the web W and the guide roller 51.

  Moreover, in the web conveyance apparatus of Example 2, a heating part is comprised by using heated air for this web floating part, and the enlargement of an apparatus can be prevented and the structure can be simplified.

  FIG. 5 is a schematic diagram illustrating a web conveyance device according to a third embodiment of the present invention. Note that members having the same functions as those of the above-described embodiments are denoted by the same symbols, and detailed description thereof is omitted.

  In the printing machine of the third embodiment, as shown in FIG. 5, the drying device 14 is provided with a cooling device 41 on the downstream side, and the cooling device 41 winds the web W and cools it. 42, 43, 44, 45, 46. In Example 3, the web W dried by the drying device 14 is wound around the cooling cylinders 42, 43, 44, 45, 46 in the rotatable cooling device 41 and is conveyed while being cooled. And a guide roller 61 as a guide part for winding and guiding the web between the cooling cylinder 41 in the cooling device 41 and the guide roller 61 heated to a predetermined temperature based on the temperature of the web W discharged from the drying device 14. A heater 62 is provided as a heating unit.

  The guide roller 61 is located between the drying device 14 and the cooling cylinder 42 and is rotatably supported at a predetermined position. The heater 62 is disposed at a facing position that is separated from the outer peripheral surface of the guide roller 61 by a predetermined distance. In this case, the heater 62 is disposed so as to face a region of the guide roller 61 where the web W is not wound so that the outer peripheral surface of the guide roller 61 can be directly heated.

  Accordingly, the web W on which printing has been completed is dried by warm air blown on the upper and lower surfaces (front surface and back surface) by the drying device 14, and is transported to the cooling device 41 via the guide roller 61. . At this time, in the drying device 14, when the ink transferred to the web W is dried, the solvent contained in the ink evaporates, and the solvent vapor flows into the guide roller 61 side as the web W travels.

  That is, the web W transported from the drying device 14 entrains ambient air including solvent vapor by the airflow generated by the traveling, and generates the airflow A on the upper surface side and the airflow B on the lower surface side. . When the web W reaches the guide roller 61, the solvent vapor airflow B accompanying the lower surface side of the web W is caught between the heated outer periphery of the guide roller 61. However, since the outer peripheral surface of the guide roller 61 is heated to a temperature higher than that of the web W by the heater 62, the solvent vapor caught between the web W and the outer peripheral surface of the guide roller 61 is condensed here. It is transported as a gas instead. When the web W is transported and separated from the guide roller 61, the solvent vapor existing during the separation is separated from the web W and the guide roller 61 together with the airflow C generated by the transport of the web W.

  Thereafter, the web W is conveyed while being wound around the cooling cylinders 42 to 46 in the cooling device 41 in order from the guide roller 61, whereby the front surface and the back surface are cooled to a predetermined temperature. As a result, the solvent vapor accompanying from the drying device 14 does not condense on the web W and adhere to the printing surface (the front surface and the lower surface), and a decrease in printing quality is prevented.

  As described above, in the web conveyance device according to the third embodiment, the guide roller 61 is provided for winding and guiding the web W dried by the drying device 14, and the guide roller 61 is opposed to the outer peripheral surface of the guide roller 61. A heater 62 is provided as a heating unit that heats 51 to a predetermined temperature based on the temperature of the web W discharged from the drying device 14.

  Accordingly, when the web W discharged from the drying device 14 reaches the guide roller 61 with the solvent vapor accompanying the surface, the solvent vapor enters between the web W and the outer peripheral surface of the guide roller 61. Since the guide roller 61 is heated, the solvent vapor between the web W and the outer peripheral surface of the guide roller 61 is not condensed here and is transferred as a gas, and the web W is separated from the guide roller 61. The web W and the guide roller 61 are separated from each other, and the adverse effect due to the solvent vapor accompanying the web W is suppressed on the web W conveyed from the drying device 14, and a coating liquid such as ink or aqueous varnish is applied. The quality of the applied surface can be improved.

  In the web conveyance device according to the second embodiment, a heater 62 as a heating unit is provided to face the outer peripheral surface of the guide roller 61. Therefore, by providing the heating unit separately from the guide unit, the guide unit, that is, the guide roller 61 can be simplified, and the easiness of arranging the heating unit, that is, the heater 62 can be improved. Can do.

  In each of the above-described embodiments, the present invention is applied to a printing machine using oil-based ink or water-based ink. However, the present invention is not limited to such a printing machine, and is a printing machine that applies a coating agent. But you can. In addition, a newspaper offset rotary printing press has a paper feeding device, an infeed device, a printing device, a web pass device, a folding device, and a paper discharge device, and has a substrate processing device upstream of the printing device. There is. This ground treatment apparatus has a ground treatment agent supply device and a drying device, and the guide portion and the heating portion of the present invention may be provided between the drying device and the printing device. The effects similar to those of the embodiments can be obtained.

  The web conveyance device and the printing press according to the present invention are provided with a guide unit that guides the web after drying and a heating unit that heats the guide unit, so that the coating liquid is conveyed from the drying device and contains a solvent on the surface. It is intended to prevent the coated surface from being lost by re-adhering the evaporated solvent to the surface on which the coating is applied, and can be applied to any conveying device or printing press.

DESCRIPTION OF SYMBOLS 11 Paper feeder 12 Infeed apparatus 13 Printing apparatus 14 Drying apparatus 15,41 Cooling apparatus 16 Web pass apparatus 17 Folding apparatus 18 Paper discharge apparatus 21, 22, 23, 24 Printing unit 25, 51 Guide roller (guide part)
25, 26, 27, 28, 42, 43, 44, 45, 46 Cooling cylinder 31, 62 Heater (heating unit)
52 Hot air mechanism (web floating part, heating part)

Claims (9)

In a web conveyance device that conveys a web dried by a drying device while being wrapped around a rotatable cooling cylinder and cooled,
A guide unit for winding and guiding a web between the drying device and the cooling cylinder;
A heating unit for heating the guide unit to a predetermined temperature based on the temperature of the web discharged from the drying device;
The web conveyance apparatus characterized by the above-mentioned.   The web conveying device according to claim 1, wherein the predetermined temperature is a temperature equal to or higher than a temperature of the web discharged from the drying device.   The web conveyance device according to claim 1, wherein the guide portion is a rotatable guide roller disposed downstream of the drying device.   4. The cooling cylinder according to claim 3, wherein a plurality of the cooling cylinders are arranged in series so that the front surface and the back surface of the web are alternately wound, and the cooling roller on the most upstream side is used as the guide roller. Web transport device.   The web conveyance device according to claim 3, wherein the heating unit is provided inside the guide member.   5. The web conveyance device according to claim 3, wherein the heating unit is provided to face an outer surface of the guide member.   The guide part is a non-rotatable guide roller disposed between the drying device and the cooling cylinder, and is provided with a web floating part that floats the web from the peripheral surface of the guide roller. The web conveyance device according to claim 1 or 2.   The said web floating part is an air injection part which injects air toward the web from the inside of the said guide roller, The said heating part is the heating air injected from the said air injection part, It is characterized by the above-mentioned. 8. The web conveyance device according to 7. A paper feeding device for feeding a web from a web,
A printing device for printing on the web fed out from the paper feeding device;
A drying device for drying the web printed by the printing device;
A cooling device that winds and cools the web dried by the drying device around a cooling cylinder;
A folding device for forming a signature by cutting and folding the web cooled by the cooling device;
A paper discharge device for discharging the signature formed by the folding device;
In a printing press comprising:
A guide unit for winding and guiding a web between the drying device and the cooling cylinder;
A heating unit for heating the guide unit to a predetermined temperature based on the temperature of the web discharged from the drying device;
A printing machine characterized by that.

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