JP3272611B2 - Varnish coating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a varnish coating apparatus which is applied in an in-line or off-line process after a printing machine.

[0002]

2. Description of the Related Art A conventional varnish coating apparatus will be described with reference to FIG.

A varnish boat 6 is provided with a varnish source roller 1, a varnish application roller 2, a plate cylinder 3, and an impression cylinder 4 whose lower part is used. The supply port and the return port of the varnish supply device 5 are connected to the varnish boat 6.

In the above, the varnish whose temperature has been adjusted is sent from the varnish supply device 5 to the varnish boat 6. The varnish source roller 1 applies varnish to the surface and rotates, and transfers the varnish to the plate cylinder 3 via the varnishing roller 2.

[0005] The article 7 to be coated is narrowed and moved by the plate cylinder 3 and the impression cylinder 4, and the varnish is transferred from the plate cylinder 3 to the surface thereof and is sent out.

[0006]

In the above-mentioned conventional varnish coating apparatus, a large amount of liquid varnish is temperature-controlled and circulated between the varnish boat.

On the other hand, the quality of the varnish surface coated on the object to be coated varies depending on the surface conditions, varnish properties and coating speed of the object to be coated. Generally, a coating operation for changing the temperature of the supply varnish and finding an appropriate temperature while changing the varnish properties is repeated. Since it cannot be changed to, it is an obstacle to work efficiency improvement.

Further, even if the varnish temperature in the varnish boat is changed,
During the transfer from the varnish source roller to the surface of the object to be coated, heat is radiated on the surface of each roller and the temperature becomes non-uniform, so that the quality of the varnish surface fluctuates.

[0009]

The present invention employs the following means to solve the above-mentioned problems.

That is, as a varnish coating apparatus,
A varnishing roller having a temperature adjusting unit, a film thickness detecting unit provided toward the varnishing roller, a reflectance detecting unit provided toward the surface of the object to be coated, the film thickness detecting unit and the reflectance detecting unit Operation control means for receiving an output of the means and sending a control signal to the temperature adjusting means.

In the above, the film thickness detecting means detects and outputs the varnish film thickness on the surface of the varnishing roller. Further, the reflectance detecting means detects and outputs the reflectance of the surface of the coating material coated with the varnish.

The arithmetic control means receives these outputs and controls the surface temperature of the varnishing roller to an appropriate value on the basis of a film thickness signal and a reflectance signal which are set in advance according to the purpose. To the temperature control means. The temperature adjusting means operates according to the input, and maintains the surface temperature of the varnishing roller at an appropriate temperature.

In this way, the surface temperature of the varnishing roller is controlled to an appropriate temperature with good responsiveness, so that the varnish quality on the surface of the object to be coated can be easily set according to the purpose and can be maintained well. .

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. The parts described in the conventional example are assigned the same reference numerals, and the description thereof will be omitted. The parts related to the present invention will be mainly described. In FIG. 1, a coating film detector 8 is provided toward the surface of the varnishing roller 2a. Further, a reflectance detector 11 is provided toward the surface of the article 7 to be coated coming out of the impression cylinder 4.
The varnishing roller 2a is, as shown in FIGS.
A nickel-plated steel roller shell 12 is coaxially arranged with a gap above, and fluid is supplied from one shaft,
It flows out from the other shaft through this gap. The fluid is warmed or warmed from the temperature control device 10,
For example, it is circulated and supplied at a flow rate of 50 to 100 (L / min).

The operation controller 9 receives the outputs of the coating film detector 8 and the reflectance detector 11 and sends a control signal to the temperature controller 10.

In the above, at the start of coating, the required film thickness signal and surface reflectance signal are set in the arithmetic and control unit 9 according to the purpose, and then the temperature of the varnishing roller 2a is adjusted according to the type of varnish. The temperature is set at an appropriate temperature, for example, in the range of 30 to 50 ° C. The set appropriate temperature signal is sent from the arithmetic and control unit 9 to the temperature adjusting device 10, which is actuated to supply a fluid at a constant temperature to the gap between the varnishing roller 2 and the varnishing roller 2.
At an appropriate temperature. At the same time, it sends a film thickness detection signal from the film thickness detector 8 and a detection signal from the surface reflectance detector 11 to the arithmetic and control unit 9. The arithmetic controller 9 calculates an appropriate temperature of the varnishing roller 2a based on a request signal set in advance and the detection signal, and sends a control signal obtained as a result to the temperature control device 10 to operate it. Then, the appropriate temperature of the varnishing roller 2a is corrected.

There is a close relationship between the temperature of the varnishing roller 2a and the film thickness and coating quality on the varnishing roller 2a. FIG. 4 shows the relationship between the temperature of the varnishing roller 2a and the film thickness on the varnishing roller 2a. By changing the temperature of the varnishing roller 2a, the varnishing roller 2a
It can be seen that the upper film thickness can be controlled. FIG.
Shows the relationship between the temperature of the varnishing roller 2a and the signal (smoothness) detected by the surface reflectance detector 10 after coating. From this figure, it can be seen that the smoothness can be controlled by changing the temperature of the varnishing roller 2a. FIG.
Shows the relationship between the glossiness of the varnish surface applied to the article 7 to be coated by the surface reflectance detector 11 and the applied film thickness. From this, it can be seen that by changing the temperature of the varnishing roller 2a, the coating film thickness can be changed and the gloss of the varnish surface can be controlled. The mounting position of the surface reflectance detector 11 is not limited to this position. For example, a paper discharge unit and an inspection table may be used.

As described above, since the surface temperature of the varnishing roller 2a is controlled to an appropriate temperature with good responsiveness, the quality of the varnish on the surface of the object to be coated can be easily set according to the purpose, and the varnish quality can be improved. Can hold.

[0019]

According to the present invention as described above,
Since the surface temperature of the varnishing roller is controlled to an appropriate temperature with good responsiveness, the quality of the varnish on the surface of the object to be coated can be easily set according to the purpose and can be maintained well.

[Brief description of the drawings]

FIG. 1 is a configuration system diagram of an embodiment of the present invention.

FIG. 2 is a sectional view of a varnishing roller having the same configuration.

FIG. 3 is a sectional view of the same embodiment taken along line AA of FIG. 2;

FIG. 4 is an operation explanatory view of the same embodiment.

FIG. 5 is an operation explanatory view of the same embodiment.

FIG. 6 is an operation explanatory view of the same embodiment.

FIG. 7 is a configuration system diagram of a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 varnish source roller 2, 2 a varnishing roller 3 plate cylinder 4 impression cylinder 5 varnish supply device 6 varnish boat 7 object to be coated 8 film thickness detecting means (film thickness detector) 9 arithmetic control means (operation controller) 10 temperature Control means (temperature control device) 11 Surface reflectance detection means (reflectance detector)

Claims (1)

(57) [Claims] 1. A varnishing roller having a temperature adjusting means, a film thickness detecting means provided toward the varnishing roller, a reflectance detecting means provided toward a surface of an object to be coated, and the film thickness detecting means A varnish coating apparatus, comprising: an arithmetic control unit that receives the output of the unit and the reflectance detection unit and sends a control signal to the temperature adjustment unit.