JP4140149B2 - Coating material drying equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for drying a coating material for drying mainly an aqueous liquid coating material such as printing ink, paint, sealant, and the like, which is applied to a long base material.
[0002]
[Prior art]
As a conventional drying apparatus for this type of coating material, one disclosed in Japanese Patent Application Laid-Open No. 10-185428 is known. This prior art is schematically shown in FIGS. 1 and 2. FIG. In FIG. 1, a drying drum 1 is wound around a long base material 2 such as a rotary paper applied to the surface, and is freely rotated by a running frictional force of the base material 2, and 3 is an outer periphery of the drying drum 1. It is a convection unit that surrounds the part (or the whole). On the inner peripheral surface of the convection unit 3, the fusible cover 4 and the exhaust cover 5 are provided alternately in the circumferential direction so as to face the surface of the drying drum 1. A hot air blower 6 comprising a blower 6 a and a heater 6 b is connected to the fusible cover 4 via a hose 7, and an exhaust device 8 is connected to the exhaust cover 5 via a hose 7.
[0003]
The rotating drying drum 1 rotates integrally with the rotating shaft 9. A heater 10 is fixed in contact with the inner surface of the drying drum 1 so as to rotate integrally with the drying drum 1. The heater 10 is connected to a power source via a slip ring 10 a provided on a support portion of the rotating shaft 9. The heater 10 is divided into a large number in the axial direction of the drying drum 1, and each heater 10 can be individually controlled by a control device.
[0004]
And the said base material 2 is heated from the inner surface while winding around the drying drum 1, and the application | coating apply | coated to this outer surface by blowing the hot air from the cover 4 for blowing on the outer surface. The material is to be dried. The hot air for drying generated in the convection unit 3 at this time is sucked from the exhaust cover 5 and discharged to the outside.
[0005]
Further, in order to shorten the drying time of the ink transferred to the printing paper, there is a technique in which the paper before being fed toward the image transfer position is preheated to a predetermined temperature or more. This is shown in Japanese Patent Application No. 8-230154.
[0006]
[Problems to be solved by the invention]
Of the conventional techniques described above, in the former, the air obtained by heating and drying the base material in the convection unit is exhausted to the outside by the exhaust device 8 in a state where the temperature is still sufficiently high. Was wasted.
[0007]
On the other hand, in the latter of the prior art, since a heating roller using a unique heat source was used for preheating the paper, a means for heating the heating roller for preheating was required in addition to the heating means in the image transfer unit, It required a lot of energy for heating.
[0008]
The present invention has been considered in view of the above, and in addition to a drying device for drying the coating material applied to the substrate, the substrate is preheated upstream of the coating material coating device for coating the coating material on the substrate. An object of the present invention is to provide a coating material drying apparatus provided with a preheating device that can save heat energy in the preheating device by using exhaust heat of the drying device as a heat source of the preheating device. It is what.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a hot air blower that blows hot air around a drying drum that is rotated by winding a substrate, and a blower that is blown around the drying drum. A convection unit comprising an exhaust device for exhausting hot air , and a hollow that is in contact with the substrate on the upstream side in the running direction of the substrate wound around the drying drum and on the upstream side of the coating material coating device A preheating device using this heating cylinder is provided, and the heating cylinder of this preheating device is connected to the exhaust side of the exhaust device of the convection unit by a hose .
[0010]
A nozzle is used together with a hollow heating cylinder in the preheating device, and exhaust from the exhaust device is introduced into the nozzle through a hose .
[0011]
[Operation]
The base material is preheated by a preheating device, and then the coating material is applied by a coating material coating device, and then dried by a drying device. The preheating device is heated by exhaust from the exhaust device of the drying device. Thereby, the exhaust heat of a drying apparatus can be used effectively.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. In the description of this embodiment, the same components as those in the prior art shown in FIGS. 1 and 2 are denoted by the same reference numerals and description thereof is omitted.
[0013]
A coating material coating device 12 for printing or printing on the surface of the base material 2 is disposed upstream of the drying device including the drying drum 1 and the like, and the base material 2 is disposed upstream of the coating material coating device 12. A preheating device 13 for preheating is disposed. The preheating device 13 includes heating cylinders 14 a and 14 b that are in rolling contact with the front surface and the back surface of the base material 2, and a nozzle 15 that faces one side surface of the base material 2.
[0014]
The heating cylinders 14a and 14b are hollow, and hoses 16 and 16 for introducing hot air into the heating cylinders 14a and 14b are connected to one end in the axial direction. An exhaust hole 17 is provided at the other end of each heating cylinder 14a, 14b. A hose 16 is also connected to one end of the nozzle 15, and the other end of each hose 16 is connected to the exhaust side of the exhaust device 8 provided in the convection unit 3 of the drying device.
[0015]
In the above configuration, the long base material 2 such as rotary paper is preheated by the preheating device 13, and then the coating material is applied by printing or printing by the coating device 12, and is then wound around the drying drum 1 of the drying device. Dried during. The exhaust from the exhaust device 8 in the drying device at this time is introduced into the heating cylinders 14 a and 14 b of the preheating device 13, and the heating cylinders 14 a and 14 b are heated by the exhaust from the exhaust device 8. In addition, the exhaust from the exhaust device 8 is also introduced into the nozzle 15 at this time, and sprayed onto the substrate 2 through the nozzle 15.
[0016]
【The invention's effect】
According to the present invention, the exhaust from the drying device can be used as the heat source of the preheating device that preheats the surface of the base material before the coating material is applied by the coating material coating device. It is not necessary to specially save the heat energy in the preheating device. In addition, since the heat of the exhaust from the drying device can be used elsewhere, the temperature of the exhaust discharged from the drying device to the outside air can be lowered.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view schematically showing a conventional coating material drying apparatus.
FIG. 2 is a longitudinal sectional front view schematically showing a conventional coating material drying apparatus.
FIG. 3 is a longitudinal sectional side view schematically showing an embodiment of the apparatus of the present invention.
FIG. 4 is a longitudinal front view schematically showing an embodiment of the apparatus of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Drying drum, 2 ... Base material, 3 ... Convection unit, 4 ... Cover for fumarole, 5 ... Cover for exhaust, 6 ... Hot air blower, 6a ... Blower, 6b, 10 ... Heater, 7 ... Hose, 8 ... Exhaust DESCRIPTION OF SYMBOLS 9 ... Rotary shaft, 12 ... Coating material application device, 13 ... Preheating device, 14a, 14b ... Heating cylinder, 15 ... Nozzle, 16 ... Hose, 17 ... Hole.

Claims (2)

A convection unit comprising a hot air blower that blows hot air around the drying drum that rotates around the substrate and an exhaust device that exhausts the hot air blown around the drying drum. In addition, a preheating device using a hollow heating cylinder that is in rolling contact with the base material is provided on the upstream side in the traveling direction of the base material wound around the drying drum and on the upstream side of the coating material application device. A drying apparatus for a coating material, wherein a heating cylinder of a preheating device is connected to an exhaust side of an exhaust device of the convection unit by a hose . 2. The coating material drying apparatus according to claim 1, wherein a nozzle is used together with a hollow heating cylinder in the preheating device, and exhaust from the exhaust device is introduced into the nozzle through a hose.

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