JP3920790B2 - Drying apparatus and drying method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drying apparatus and a drying method, and more particularly to a drying apparatus and a drying method for drying a coating film on a web.
[0002]
[Prior art]
The method of applying a liquid to a continuously running web and drying it is a color iron plate, PS plate (a plate material such as aluminum, paper, plastic, etc. (hereinafter referred to as a substrate) coated with a coating solution such as a photosensitive solution) It is preferably used for the production of photographic film. In particular, the PS plate is subjected to mechanical, chemical, and electrochemical treatment on the surface of a web formed from continuously running aluminum to create a grainy surface, an anode coating surface, and a hydrophilized surface. A coating solution to be a photosensitive resin is applied on the top, dried and then cut into a product.
[0003]
By the way, since the endothermic amount of the web changes when the thickness or width of the web changes, if the heating amount is made constant, the thicker the web and the wider the width, the less heat is used in the coating liquid drying method. turn into. For this reason, it has been attempted to control the web temperature by adjusting the amount of heat supplied to the web. For example, in Patent Document 1, in order to further give heat to the web, a small-diameter heating roll group and hot air supply means are newly provided, and the temperature of the coating film (coating layer) on the drying chamber outlet side as necessary. It is disclosed that the amount of heat applied to the web is controlled by adjusting the heating roll temperature and the hot air temperature in order to stabilize the performance. .
[0004]
[Patent Document 1]
JP-A-9-66259 (page 2-3, FIG. 1)
[0005]
[Problems to be solved by the invention]
However, in patent document 1, the drying apparatus is newly provided and the simplification of an installation is requested | required. Also, since it is difficult to change the temperature of hot air instantaneously, it takes time to change the temperature condition of the web, that is, when the web characteristics (width, thickness, material, etc.) change, It takes time to reach the set temperature, and during this time, it is necessary to stop the conveyance of the web or to make the speed very slow, so that there is a problem that the loss of manufacturing time is large.
[0006]
An object of this invention is to provide the drying apparatus and drying method which can change the temperature of a web to preset temperature in a short time, even if the characteristic of a web changes.
[0007]
[Means for Solving the Problems]
  The present inventionContinuously running web surfaceDry the coating film with dry airIn the drying device,A characteristic change detecting means for detecting a characteristic change caused by at least one change in the width, thickness, composition, and material of the web; and when the characteristic change detecting means detects the characteristic change of the web, according to the detection The temperature of the surface of the heating amount adjusting pass roll supporting the back surface of the web is adjusted to be higher or lower than the target temperature of the web, and when the temperature of the web is close to the target temperature, the temperature of the surface Heating amount adjusting means for adjusting the temperature to the target temperature of the web. The heating amount adjusting means includes a first container that stores a first heat medium having a temperature higher or lower than the target temperature, a second container that stores a second heat medium having the target temperature, and the characteristic change detection. When the means detects the change in the characteristic of the web, the first heat medium is sent to the flow path formed in the heating amount adjustment pass roll, and when the temperature of the web is close to the target temperature, It is preferable to have a controller that sends the second heat medium to the flow path. The heating amount adjusting means adjusts the second heat medium to a first target temperature of the high target temperature when increasing the amount of heating to the web by detecting the characteristic change, and the first heat medium. Is adjusted to a first set temperature higher than the first target temperature, and when the amount of heating to the web is reduced by detecting the characteristic change, the second heat medium is moved to a second target temperature at the low target temperature. It is preferable to have a temperature controller that adjusts the first heat medium to a second set temperature that is lower than the second target temperature. The heating amount adjusting means stores a first container that stores a first heat medium having a temperature higher or lower than the target temperature, and a second container that stores a second heat medium having a first target temperature that is higher than the target temperature. A container, a third container for storing a third heat medium having a second target temperature, which is a low target temperature, and the first heat medium when the heating amount to the web is increased by detecting the characteristic change. When adjusting to a first set temperature higher than one target temperature and reducing the amount of heating to the web by detecting the characteristic change, the first heat medium is set to a second set temperature lower than the second target temperature. When increasing the amount of heating to the web by detecting the characteristic change and the temperature controller that adjusts to the time when the temperature of the web is close to the target temperature, the first heat medium is sent to the flow path The second heat medium into the flow path. When the amount of heating to the web is reduced by detecting the characteristic change, the first heat medium is sent to the flow path, and when the temperature of the web is close to the target temperature, the third heat medium It is preferable to have a controller that sends to the flow path.
[0008]
  The heating amount adjusting means includes a first heating amount adjusting pass roll whose surface temperature is higher or lower than the target temperature, a second heating amount adjusting pass roll whose surface temperature is the target temperature, and the characteristic change detection. When the means detects the characteristic change of the web, the first heating amount adjustment pass roll is brought into contact with the web, and when the temperature of the web is close to the target temperature, the second heating amount adjustment pass roll. It is preferable to have a switching unit that contacts the web. The heating amount adjusting means adjusts the surface temperature of the second heating amount adjusting pass roll to the first target temperature of the high target temperature when increasing the heating amount to the web by detecting the characteristic change. When the temperature of the surface of the first heating amount adjustment pass roll is adjusted to a first set temperature that is higher than the first target temperature and the amount of heating to the web is reduced by detecting the characteristic change, The temperature of the surface of the 2 heating amount adjusting pass roll is adjusted to the second target temperature of the low target temperature, and the temperature of the surface of the first heating amount adjusting pass roll is set to a second temperature lower than the second target temperature. It is preferable to have a temperature controller that adjusts the temperature. Further, the heating amount adjusting means includes a first heating amount adjusting pass roll whose surface temperature is higher or lower than the target temperature, and second heating of the first target temperature of the target temperature where the surface temperature is high. A volume adjustment pass roll, a third heating amount adjustment pass roll having a second target temperature of the target temperature having a low surface temperature, and the first heating amount when the heating amount to the web is increased by detecting the characteristic change. When the surface temperature of the adjustment pass roll is adjusted to a first set temperature that is higher than the first target temperature, and the amount of heating to the web is reduced by detecting the characteristic change, the first heating amount adjustment pass roll A temperature controller that adjusts the surface temperature to a second set temperature lower than the first target temperature; and when the heating amount to the web is increased by detecting the characteristic change, the first heating An adjustment pass roll is brought into contact with the web, and when the temperature of the web is close to the target temperature, the second heating amount adjustment pass roll is brought into contact with the web, and the amount of heating to the web is detected by detecting the characteristic change. The first heating amount adjusting pass roll is brought into contact with the web, and when the temperature of the web is close to the target temperature, a switching unit for bringing the third heating amount adjusting pass roll into contact with the web; It is preferable to have.
[0009]
  The present invention also provides:Continuously running web surfaceDry the coating film with dry airIn the drying method,A characteristic change due to at least one change in the width, thickness, composition, and material of the web is detected, and in response to the detection, the surface temperature of the heating amount adjusting pass roll that supports the back surface of the web is determined from the target temperature of the web. The temperature of the surface is adjusted to a high temperature or a low temperature, and the temperature of the surface is adjusted to the target temperature of the web when the temperature of the web approaches the target temperature. When the characteristic change detecting means detects the characteristic change of the web, the first heat medium having a temperature higher or lower than the target temperature of the web is sent to a flow path formed in the heating amount adjusting pass roll.,When the temperature of the web is close to the target temperature, the second heat medium having the target temperature of the web is sent to the flow path, or the characteristic change detecting means detects the characteristic change of the web. Sometimes, the first heating amount adjusting pass roll having a temperature higher or lower than the target temperature of the web is brought into contact with the web, and when the temperature of the web becomes close to the target temperature, the first target temperature of the web is changed. It is preferable to bring the 2 heating amount adjusting pass roll into contact with the web.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
[web]
The web used in the present invention is not particularly limited as long as it is a long strip. Specifically, the surface of the aluminum web is sharpened, and if necessary, the sharpened surface is anodized PS plate support, and a photosensitive layer is formed on the sharpened surface of the PS plate support. A PS original plate in which the surface of the photosensitive layer is matted as necessary is exemplified.
[0011]
[Coating solution]
The coating solution used in the present invention is appropriately determined according to the target product and is not particularly limited. The coating solution for forming the coating layer is not limited to single-layer coating using one type, and the coating layer may be formed by multilayer coating using two or more types of coating solutions. Specific examples of the coating solution include a photosensitive layer forming solution used for forming the photosensitive layer of the PS original plate and an oxygen-permeable resin solution as a main component, and the protective layer is applied to the surface of the PS original plate. And an oxidation protective layer forming solution for forming the. Moreover, the solvent which comprises the coating liquid used for this invention can also use both inorganic compounds, such as water, and an organic solvent.
[0012]
The drying apparatus of the present invention will be described using a coating / drying facility 10 shown in FIG. The web 11 is conveyed from the upstream side of the coating / drying equipment 10. There are a plurality of types of webs 11 having different properties such as thickness, width, composition, and material depending on the product form. For example, the web 11 has a thin web (hereinafter referred to as “thin web”) 11 a and a web (hereinafter referred to as “thick web”) 11 b that is thicker than the thin web joined at a joint 11 c. Further, the thin web 11d is joined to the thick web 11b at the joining portion 11e to form a long belt shape. The web 11 is continuously wound around a roll 12 and sent to the coating machine 20. In addition, it is advantageous in terms of cost to detect the joint portion of the web 11 by the joint sensor 13 and transmit the result to the controller 14 to automate the change of the drying conditions.
[0013]
In the coating machine 20, the web 11 is wound around the backup roll 21 and continuously runs, and the coating liquid is applied to the web 11 from the coating die 22. Hereinafter, this is referred to as a coated web 15. FIG. 1 shows an example in which an extrusion coater is used for the coating machine 20. However, as the coating device, any of known coating devices such as a roller type, an air knife type coating device, a slide bead coating device, and a curtain type coating device can be used.
[0014]
The coating / drying equipment 10 includes a first dryer 30, a second dryer 40, and a third dryer 50. The first dryer 30 includes a drying chamber 31 serving as a drying zone, and a drying air circulation device 33 that blows the drying air 32 into the drying chamber 31. Further, a pass roll 34 is provided in the drying chamber 31 for transporting the coated web 15 without bending. Although the number of the pass rolls 34 is two in FIG. 1, it is not limited to this number. In the initial stage of drying, the surface of the coating liquid on the air surface side is made good by not bringing the heated roll or the like into direct contact with the coated web 15. The drying air 32 is preferably a parallel air that is parallel to the coated web 15, but is not limited thereto. The coated web 15 is initially dried by the first dryer 30 and then sent to the second dryer 40.
[0015]
The second dryer 40 also includes a drying chamber 41 and a drying air circulation device 43 that blows the drying air 42. A slit plate 44 is provided in the drying chamber 41 in parallel with the coated web 15, and the drying air 42 is blown from the slit plate 44 to the coated web 15 to accelerate the progress of drying. In addition, a plurality of pass rolls 45, 46, 47 that come into contact with the coated web 15 are provided. A part of these pass rolls is provided with a heating amount adjusting device 48, which forms heating amount adjusting pass rolls (hereinafter referred to as heating rolls) 46 and 47. The heating rolls 46 and 47 are adjusted to an optimum temperature according to the characteristics of the web 11. After the coated web 15 is dried by the second dryer 40, it is sent to the third dryer 50.
[0016]
In the drying chamber 51 of the third dryer 50, drying air circulation devices 53 and 54 for blowing the drying air 52 a and 52 b are attached to both the coating liquid application surface side and the coating liquid non-application surface side of the coated web 15. ing. In FIG. 1, two drying air circulation devices 53 and 54 are shown, but the drying air 52a is applied to the coating liquid application surface side and the coating liquid non-application surface side of the coated web 15 by one drying air circulation device. , 52b may be sprayed. A slit plate 55 and slit plates 56a and 56b are provided in the drying chamber 51 in order to make the drying air 52a and 52b slit. Further, pass rolls 57 and 58 that are in contact with the coated web 15 are provided. A part of the pass roll is connected to the heating amount adjusting device 48 to form a heating roll 58. By using this heating roll 58, it is possible to easily change the drying conditions. The coated web 15 dried by the third dryer 50 is formed with a coating layer and used as a product 16 in a subsequent process.
[0017]
FIG. 2 shows and explains one embodiment of a method for adjusting the heating amount of the heating roll 46. The heating amount adjusting device 48 includes a heat medium circulating device 62, heat medium containers (hereinafter referred to as containers) 63a and 63b, temperature adjusters 64a and 64b for adjusting the temperature of the containers, and valves 65a and 65b. Yes. In addition, it is preferable to use an electromagnetic switching valve for the valves 65a and 65b. In the heating roll 46, a flow path 46a through which a heat medium flows is formed. A thermometer 46 b is attached to the heating roll 46. Heat mediums 66a and 66b are injected into the containers 63a and 63b, respectively, and are kept at a constant temperature by the temperature controllers 64a and 64b.
[0018]
The controller 68 gives an instruction to open one of the valves 65a and 65b in response to a signal from the controller 14, and either one of the heat mediums 66a and 66b is caused to flow through the flow path 46a by the pump 67 so that the temperature of the heating roll 46 is increased. Adjust. It is advantageous from the viewpoint of cost that the heat medium that has passed through the flow path 46 a is returned from the pipe 69 to the heat medium circulation device 62 and reused. The kind of the heat medium used in the present invention is not particularly limited, and any known liquid or gas can be used. Further, the heating rolls 47 and 58 are also adjusted for the heating amount under the same conditions as the heating roll 46, and thus the description thereof is omitted.
[0019]
The heating rolls 46, 47, and 58 may all be free rolls or drive rolls equipped with a drive device (not shown). Moreover, the heating amount adjusting method includes a method of sending steam, hot water, gas, oil or the like into the roll. Further, a method of adjusting the heating amount using a device using radiant heat such as infrared rays or a device using induction heat generation may be used. The heating amount of the web is preferably adjusted by adjusting the surface temperature of the roll.
[0020]
The form of each dryer 30, 40, 50 used in the present invention, for example, the number of rolls, the number and location of heating rolls, presence / absence of blowing air, and the number of dryers are also illustrated. It is not limited. Further, the material of the rolls 34, 45, 46, 47, 57, and 58 is not particularly limited in terms of the material, the presence or absence of a coating layer on the surface, the type of coating layer, the structure of the roll, and the like. Can also be used. In order to adjust the drying temperature, a heat transfer plate can be used instead of the roll. Furthermore, the method of spraying the drying air 32, 42, 52a, 52b, the type of gas, and the like are not particularly limited. Further, the drying air blown into each dryer 30, 40, 50 may be discharged from each exhaust port (not shown) without being circulated.
[0021]
The drying method of the present invention will be described. A thin web 11a formed of aluminum having a width of 1000 mm and a thickness of 0.2 mm and a thick web 11b formed of aluminum having a thickness of 0.5 mm are joined by a joining portion 11c, and the thin web 11d is joined by a joining portion 11e. The web 11 is formed by bonding. The web 11 is continuously run at a speed of 50 m / min. As the coating solution, a photosensitive layer forming solution for forming the photosensitive layer of the PS original plate is used. The coating solution is applied using the applicator 20 so that the thickness after drying is 1 μm. The temperature of the heating roll 46 is adjusted so that the drying temperature of the thin web 11a (hereinafter also referred to as the thin web drying temperature) T1 is 50 ° C. The heating amount is adjusted by setting the heat medium 66a to 50 ° C. using the temperature controller 64a and flowing it through the flow path 46a (see FIG. 2). In addition, since the heating rolls 47 and 58 are performed on the same conditions, description is abbreviate | omitted. Further, the temperature of the drying air 32, 42, 52a, 52b is also adjusted by the corresponding drying air circulation devices 33, 43, 53, 54.
[0022]
A product 16 is continuously produced from the web 11. When the web joint 11 c reaches the measurement position of the joint sensor 13, the joint sensor 13 detects a change in the web characteristic and transmits a signal to the controller 14. The controller 14 controls the drying air circulation devices 33, 43, 53, and 54 and the heating amount adjusting device 48 to adjust the heating amount while the thick web 11 b is sent to the coating machine 20 and applied.
[0023]
The temperature of the heat medium 66b is previously adjusted to 200 ° C. (first set temperature) T2 using the temperature controller 64b. Based on the signal transmitted from the controller 14, the controller 68 closes the valve 65a, opens the valve 65b, and causes the heat medium 66b to flow through the flow path 46a. The temperature of the heating medium is switched from 50 ° C. to 200 ° C., and the temperature of the heating roll 46 is increased to around 100 ° C., which is a thick web drying temperature (target temperature, hereinafter referred to as thick web drying temperature) T3. The temperature of the heating roll 46 is measured using a thermometer 46b. During this time, the temperature of the heat medium 66a is adjusted to 100 ° C., which is the thick web drying temperature T3, using the temperature adjuster 64a. Thereafter, the controller 68 closes the valve 65b, opens the valve 65a, and causes the heat medium 66a to flow through the flow path 46a. And the temperature of the heating roll 46 is hold | maintained at 100 degreeC which is thick web drying temperature T3, and the coated web 15 is dried. The heating rolls 47 and 58 also adjust the amount of heating to the coated web 15 under the same conditions. Further, the temperature of the drying air 32, 42, 52a, 52b is also adjusted by the corresponding drying air circulation devices 33, 43, 53, 54.
[0024]
Conventionally, it took about 40 minutes to change from the thin web drying temperature T1 to the thick web drying temperature T3. However, in the present invention, the temperature of the heating rolls 46, 47, and 58 is adjusted to the thick web drying temperature T3 after heating the target temperature to the first set temperature T2 that is higher than the thick web drying temperature T3. The time until the drying temperature T3 is stabilized at 100 ° C. can be shortened to 50 seconds.
[0025]
Next, heating amount adjustment when the web thickness changes from thick to thin will be described. When the joint sensor 13 senses the joint 11e, the temperature adjustment of the heating roll 46 is started as described above. The heat medium 66b is previously adjusted to 20 ° C., which is the second set temperature T4, using the temperature adjuster 64b. The controller 68 closes the valve 65a, opens the valve 65b, and causes the heat medium 66b at 20 ° C. to flow through the flow path 46a. At this time, the temperature of the heat medium 66a is adjusted to 50 ° C., which is the thin web drying temperature T1, using the temperature adjuster 64a. After the temperature of the heating roll 46 drops to around 50 ° C., which is the thin web drying temperature T1, the valve 65b is closed, the valve 65a is opened, and the heating medium 66a at 50 ° C. is caused to flow through the flow path 46a. The heating rolls 47 and 58 also adjust the heating amount under the same conditions. The drying air 32, 42, 52a, 52b in each dryer 30, 40, 50 is also adjusted to the drying temperature corresponding to the thickness of the web.
[0026]
Conventionally, it took about 40 minutes to change from the thick web drying temperature T3 to the thin web drying temperature T1. However, in the present invention, the temperature of the heating rolls 46, 47, and 58 is adjusted to the thin web drying temperature T1 after the temperature is lowered to the target temperature of the second preset temperature T4 that is lower than the thin web drying temperature T1, so The time until the web drying temperature T1 is stabilized at 50 ° C. can be shortened to 70 seconds.
[0027]
Furthermore, as another heating amount adjusting method, for example, when the thin web drying temperature T1 is set to 50 ° C. and the thick web drying temperature T3 is changed to 100 ° C., the first preset temperature T2 is set to 300 ° C. The change time from the drying temperature T1 to the thick web drying temperature T3 can be shortened to 25 seconds. In addition, when the characteristic of a web changes, in order to adjust the heating amount given to a web, the heat medium of the 1st and 2nd preset temperature exceeding the target temperature (thin web drying temperature, thick web drying temperature) Used. Also in this case, the optimum set temperature is selected so that it is within the drying history range that maintains the coating film performance.
[0028]
Another embodiment of the drying apparatus according to the present invention will be described with reference to FIG. The same portions as those of the heating amount adjusting device 48 are denoted by the same reference numerals, and the description thereof is omitted. The heating amount adjusting device 60 shown in FIG. 3 allows the third heat medium 66c to flow through the flow path 46a further through the heating amount adjusting device 48 described above, so that the container 63c, the temperature adjusting device 64c, and the valve 65c. And are provided.
[0029]
The heat medium 66a is set to a thin web drying temperature T1 of 50 ° C. by the temperature controller 64a, the heat medium 66b is set to 150 ° C. which is the first set temperature T2 by the temperature controller 64b, and the heat medium 66c is thick by the temperature controller 64c. The web drying temperature T3 is adjusted to 100 ° C. While the coated web 15 formed from a thin web is continuously coated and dried, the heated roll 46 is heated by the heating medium 66a at 50 ° C. to dry the coated web 15.
[0030]
When the joint sensor 13 senses the passage of the joint 11c, the heating amount adjustment of the heating roll 46 is started as described above. The valve 65a is closed, the valve 65b is opened, and the heat medium 66b at 150 ° C. is caused to flow through the flow path 46a, so that the temperature of the heating roll 46 is rapidly increased. When the controller 68 receives a signal from the thermometer 46b that the temperature of the heating roll 46 has reached the vicinity of the thick web drying temperature (about 100 ° C), the controller 68 closes the valve 65b, opens the valve 65c, and heats 100 ° C. The medium 66c is caused to flow through the flow path 46a to keep the temperature of the heating roll 46 constant. Note that it is preferable to return any of the heat mediums 66 a, 66 b, 66 c from the pipe 69 to the heat medium circulation device 62.
[0031]
As described above, when the drying temperature of the thick web is adjusted from the thin web, the heating roll 46 is heated with the target of the first set temperature T2 that is higher than the thick web drying temperature T3. Can be performed in a short time.
[0032]
The adjustment of the drying temperature from the thick web to the thin web will be described. The heat medium 66b is adjusted to a low second set temperature (for example, 20 ° C.) T4 that is lower than the thin web drying temperature (for example, 50 ° C.) T1. When the joint portion sensor 13 senses the joint portion 11e between the thick web and the thin web, the controller 68 closes the valve 65c, opens the valve 65b, and causes the heat medium 66b to flow through the flow path 46a. The temperature of the heating roll 46 decreases to near the thin web drying temperature (about 50 ° C.). Thereafter, the valve 65b is closed, and the heating medium 66a having the thin web drying temperature T1 is flowed into the flow path 46a to adjust the heating amount of the heating roll 46. In this way, when adjusting the drying temperature of the thin web from the thick web, the temperature of the heating roll 46 is lowered with the target temperature being the second preset temperature T4 that is lower than the thin web drying temperature T1, so the adjustment of the drying temperature condition is performed. Can be performed in a short time. The experimental conditions (set temperature and target temperature) described above are examples used for explaining the present invention in detail, and the experimental conditions are not limited to those described.
[0033]
Another embodiment of the drying apparatus according to the present invention will be described with reference to FIG. The roll unit 82 provided with the two heating rolls 80 and 81 has a function of switching the roll to be brought into contact with the coated web. Moreover, temperature regulators 80a and 81a are attached to the heating rolls 80 and 81, and the temperature can be adjusted independently. Such a roll unit 82 can be used as a heating amount adjusting device for adjusting the heating amount to the web.
[0034]
A method for changing the drying temperature from the thin web drying temperature T1 to the thick web drying temperature T3 will be described. The heating roll 80 is adjusted to a thin web drying temperature (for example, 50 ° C.) T1, and is in contact with the coated web 15 formed from the thin web and dried. At this time, the temperature of the heating roll 81 is adjusted to the first set temperature (for example, 150 ° C.) T2 by the temperature controller 81a. When the thickness of the web is changed from thin to thick, when the roll that contacts the coated web 15 is switched from the heating roll 80 to the heating roll 81, the temperature of the coated web 15 rapidly increases. During this time, the temperature of the heating roll 80 is adjusted to a thick web drying temperature (for example, 100 ° C.) T3 by the temperature controller 80a. After the drying temperature of the coated web 15 reaches the vicinity of the thick web drying temperature T3, the roll that contacts the coated web 15 is switched from the heating roll 81 to the heating roll 80. In this way, the drying temperature can be adjusted in a short time by adjusting the heating amount.
[0035]
In addition, the drying temperature can be similarly changed from the thick web drying temperature T3 to the thin web drying temperature T1. The heated web 80 adjusted to the thick web drying temperature T3 is brought into contact with the coated web 15 to dry the coated web 15. At this time, the temperature of the heating roll 81 is adjusted to the second set temperature (for example, 20 ° C.) T4. When the thickness of the web is changed from thick to thin, when the roll contacting the coated web 15 is switched from the heating roll 80 to the heating roll 81, the temperature of the coated web 15 rapidly decreases. During this time, the temperature of the heating roll 80 is adjusted to the thin web drying temperature T1. After the drying temperature of the coated web 15 reaches the vicinity of the thin web drying temperature T1, the roll that contacts the coated web 15 is switched from the heating roll 81 to the heating roll 80. Thus, the drying temperature can be adjusted from the thick web to the thin web in a short time.
[0036]
Still another embodiment using the roll unit 82 shown in FIG. 4 will be described. A heated roll 80 adjusted to a thin web drying temperature T 1 is brought into contact with the coated web 15. Further, the temperature of the heating roll 81 is adjusted to the thick web drying temperature T3. When the web is changed from thin to thick, if the roll that contacts the coated web 15 is switched from the heating roll 80 to the heating roll 81, the temperature of the heating roll that contacts the coated web 15 changes immediately. Adjustment can be done in a short time.
[0037]
It is also possible to change the drying temperature from the thick web drying temperature T3 to the thin web drying temperature T1. The heating roll 80 is adjusted to the thick web drying temperature T3, and the heating roll 81 is adjusted to the thin web drying temperature T1. The heated roll 80 is brought into contact with the coated web 15 to dry the coated web 15. When the thickness of the web is changed from thick to thin, the roll contacting the coated web 15 is switched from the heating roll 80 to the heating roll 81. Thereby, the temperature of the heating roll which contacts the coated web 15 is immediately switched, and the temperature can be adjusted in a short time.
[0038]
Another embodiment of the drying apparatus according to the present invention will be described with reference to FIG. The roll unit 88 provided with the three heating rolls 85, 86, 87 has a roll switching function, and is equipped with temperature controllers 85a, 86a, 87a. Each can be controlled independently. First, a method for drying the coated web 15 whose thickness changes from thin to thick will be described. The heated roll 85 adjusted to the thin web drying temperature T1 using the temperature controller 85a is brought into contact with the coated web 15 and dried. At this time, the temperature of the heating roll 86 is adjusted to the first set temperature T2 by the temperature adjuster 86a. When the coated web 15 is changed from thin to thick, the temperature of the coated web 15 is rapidly increased by switching the roll in contact with the coated web 15 from the heating roll 85 to the heating roll 86. Further, the temperature of the heating roll 87 is adjusted to the thick web drying temperature T3 by the temperature controller 87a. After the temperature of the coated web 15 reaches the vicinity of the thick web drying temperature T3, the temperature can be adjusted in a short time by switching the roll that contacts the coated web 15 from the heating roll 86 to the heating roll 87.
[0039]
A method of drying a coated web that changes from thick to thin using the roll unit 88 will be described. A heated roll 85 having a thick web drying temperature T3 is brought into contact with the coated web 15 and dried. At this time, the heating roll 86 is adjusted to the second set temperature T4. When the web of the coated web 15 is changed from thick to thin, the temperature of the coated web 15 is rapidly lowered by switching from the heating roll 85 to the heating roll 86. The heating roll 87 is adjusted to the thin web drying temperature T1. After the temperature of the coated web 15 reaches the vicinity of the thin web drying temperature T1, the temperature can be adjusted in a short time by switching the roll that contacts the coated web 15 from the heating roll 86 to the heating roll 87. By providing the roll units 82 and 88 having such a plurality of heating rolls in the dryers 40 and 50, the temperature of the heating roll can be easily adjusted according to changes in the characteristics of the web. The temperature adjustment of the heating rolls 80, 81, 85 to 87 of the roll units 82, 88 is performed by adjusting the temperature at a position not in contact with the coated web 15 when the rolls are switched as described above. Alternatively, it may be used for drying the coated web after adjusting to a predetermined temperature. The roll unit that switches the plurality of rolls adjusted in temperature and dries the coated web is not limited to the form shown in FIGS. 4 and 5.
[0040]
FIG. 6 is a main part schematic diagram showing another embodiment of the drying apparatus according to the present invention. As shown to (a), the heating roll 91 with which the heating amount adjustment apparatus 90 was attached was made to contact the coated web 15, and a coating film is dried. The amount of heating is adjusted by controlling the wrap angle θ between the coated web 15 and the heating roll 91 by a wrap angle adjusting device 92 as shown in FIG. Thereby, the magnitude | size of the contact surface 15a is changed and the heating amount provided to the coated web 15 changes. When adjusting the lap angle, the heating amount may be adjusted by the heating amount adjusting device 90. The heating amount adjusting device 90 may supply a heat medium into the heating roll 91 or may be a heater.
[0041]
【The invention's effect】
According to the present invention, the amount of heating is adjusted in accordance with the characteristics of the web, so that the drying temperature can be changed in a short time, improving the productivity of the product in which the coating layer is formed on the web, stabilizing the performance of the product, Energy savings associated with improved productivity can be achieved.
[Brief description of the drawings]
FIG. 1 is a schematic view of a coating and drying facility equipped with a drying apparatus according to the present invention.
FIG. 2 is a schematic view of a main part of the drying apparatus shown in FIG.
FIG. 3 is a schematic view of a main part of another embodiment of a drying apparatus according to the present invention.
FIG. 4 is a schematic view of a main part of another embodiment of the drying apparatus according to the present invention.
FIG. 5 is a schematic diagram of a main part of another embodiment of a drying apparatus according to the present invention.
FIG. 6 is a schematic view of a main part of another embodiment of a drying apparatus according to the present invention.
[Explanation of symbols]
10 Coating and drying equipment
11a, 11d Thin web
11b Thick web
11c, 11e joint
15 Pre-coated web
30, 40, 50 dryer
46, 47, 58 Heating roll
48 Heating amount adjustment device
82,88 roll unit
T1 Thin web drying temperature
T2 First set temperature
T3 Thick web drying temperature
T4 Second set temperature

Claims (10)

In a drying apparatus that dries the coating film on the surface of a continuously running web with a drying air ,
A characteristic change detecting means for detecting a characteristic change caused by at least one change in the width, thickness, composition, and material of the web;
When the characteristic change detecting means detects the characteristic change of the web, the surface temperature of the heating amount adjusting pass roll that supports the back surface of the web is higher or lower than the target temperature of the web according to the detection. And a heating amount adjusting means for adjusting the surface temperature to the target temperature of the web when the temperature of the web approaches the target temperature . The heating amount adjusting means includes
A first container for storing a first heat medium having a temperature higher or lower than the target temperature;
A second container for storing the second heat medium having the target temperature;
When the characteristic change detecting means detects the characteristic change of the web, the first heat medium is sent to a flow path formed in the heating amount adjusting pass roll, and the temperature of the web is close to the target temperature. The drying apparatus according to claim 1 , further comprising a controller that sends the second heat medium to the flow path . The heating amount adjusting means includes
When increasing the amount of heating to the web by detecting the characteristic change, the second heat medium is adjusted to a first target temperature of the high target temperature, and the first heat medium is heated to a temperature higher than the first target temperature. When the amount of heating to the web is reduced by detecting the characteristic change, the second heat medium is adjusted to a second target temperature of the low target temperature, and the first heat medium is adjusted. The drying apparatus according to claim 1, further comprising: a temperature controller that adjusts the temperature to a second set temperature lower than the second target temperature . The heating amount adjusting means includes
A first container for storing a first heat medium having a temperature higher or lower than the target temperature;
A second container for storing a second heat medium having a first target temperature of the high target temperature;
A third container for storing a third heat medium having a second target temperature at the low target temperature;
When increasing the amount of heating to the web by detecting the characteristic change, the first heat medium is adjusted to a first set temperature higher than the first target temperature, and the web is heated by detecting the characteristic change. A temperature controller for adjusting the first heat medium to a second set temperature lower than the second target temperature when reducing the amount;
When increasing the amount of heating to the web by detecting the characteristic change, the first heat medium is sent to the flow path, and when the temperature of the web is close to the target temperature, the second heat medium is When the amount of heating to the web is reduced by detecting the characteristic change, the first heat medium is sent to the flow path, and when the temperature of the web approaches the target temperature, The drying apparatus according to claim 1 , further comprising a controller that sends three heat media to the flow path . The heating amount adjusting means includes
A first heating amount adjustment pass roll whose surface temperature is higher or lower than the target temperature;
A second heating amount adjustment pass roll whose surface temperature is the target temperature;
When the characteristic change detecting means detects the characteristic change of the web, the second heating amount adjustment pass roll is brought into contact with the web, and when the temperature of the web is close to the target temperature, the second The drying apparatus according to claim 1 , further comprising a switching unit that causes the heating amount adjusting pass roll to contact the web . The heating amount adjusting means includes
When increasing the amount of heating to the web by detecting the characteristic change, the surface temperature of the second heating amount adjusting pass roll is adjusted to the first target temperature of the high target temperature, and the first heating amount adjusting pass roll is adjusted. When the temperature of the surface is adjusted to a first set temperature that is higher than the first target temperature and the amount of heating to the web is reduced by detecting the characteristic change, the surface of the second heating amount adjusting pass roll A temperature controller that adjusts the temperature to a second target temperature of the target temperature that is low and adjusts the surface temperature of the first heating amount adjustment pass roll to a second set temperature that is lower than the second target temperature; drying apparatus according to claim 1 or 5, wherein the. The heating amount adjusting means includes
A first heating amount adjustment pass roll whose surface temperature is higher or lower than the target temperature;
A second heating amount adjustment pass roll at a first target temperature of the target temperature at which the surface temperature is high;
A third heating amount adjustment pass roll having a second target temperature of the target temperature at which the surface temperature is low;
When increasing the amount of heating to the web by detecting the property change, the temperature of the surface of the first heating amount adjustment pass roll is adjusted to a first set temperature higher than the first target temperature, and the property change A temperature controller for adjusting the temperature of the surface of the first heating amount adjustment pass roll to a second set temperature lower than the first target temperature when reducing the amount of heating to the web by detection;
When increasing the amount of heating to the web by detecting the characteristic change, the first heating amount adjustment pass roll is brought into contact with the web, and when the temperature of the web is close to the target temperature, the second amount of heating is increased. When the adjustment pass roll is brought into contact with the web and the amount of heating to the web is reduced by detecting the characteristic change, the first heating amount adjustment pass roll is brought into contact with the web, and the temperature of the web becomes close to the target temperature. The drying apparatus according to claim 1 , further comprising: a switching unit that causes the third heating amount adjustment pass roll to contact the web when the third heating amount adjustment pass roll is brought into contact with the web . In a drying method in which a coating film applied to the surface of a continuously running web is dried with a drying air ,
Detecting a change in characteristics due to at least one change in the width, thickness, composition, and material of the web;
In response to the detection, the surface temperature of the heating amount adjustment pass roll supporting the back surface of the web is adjusted to be higher or lower than the target temperature of the web,
When the temperature of the web becomes close to the target temperature, the surface temperature is adjusted to the target temperature of the web . When the characteristic change detecting unit detects the characteristic change of the web, the first heat medium having a temperature higher or lower than the target temperature of the web is sent to a flow path formed in the heating amount adjusting pass roll ,
The drying method according to claim 8 , wherein when the temperature of the web becomes close to the target temperature, the second heat medium having the target temperature of the web is sent to the flow path . When the property change detecting means detects the property change of the web, a first heating amount adjusting pass roll having a temperature higher or lower than a target temperature of the web is brought into contact with the web,
The drying method according to claim 8 , wherein when the temperature of the web becomes close to the target temperature, a second heating amount adjusting pass roll having the target temperature of the web is brought into contact with the web .

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