JP2003013389A - Method and apparatus for detecting wear of calendar roll in super calendar device - Google Patents

Abstract

An object of the present invention is to provide a method and a device for detecting abrasion of a roll in a super calendar device capable of improving productivity of the super calendar device. Kind Code: A1 In a method for detecting wear of a calendar roll in a super calendar device, a step of measuring a calendar roll surface temperature A of a web contact portion, a step of measuring a calendar roll surface temperature B of a web non-contact portion, Calculating the temperature A and the surface temperature B, the surface temperature A and the surface temperature B measured during the calendar operation.
Is calculated, and the temperature difference is equal to or greater than a preset value,
Alternatively, when the surface temperature B exceeds the allowable temperature of the calendar roll, this is detected, and the wear of the calendar roll is determined to be in an extreme state. And its equipment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting wear of a calender roll in a super calender device and its device. More specifically, the surface temperature of the calender roll during operation is measured to reach a specific temperature. The present invention relates to a method of detecting wear of a calender roll in a super calender device and a device therefor capable of detecting such a situation and determining that the wear of the calender roll is in an extreme state.

[0002]

2. Description of the Related Art Generally, it is known that a calendar roll in a super calendering device is abraded over time due to friction with a web during calendering. When the calender roll is worn, the calender linear pressure becomes non-uniform and the web quality is deteriorated. Further, since the wear progresses toward the portion in contact with the web, there is a difference in roll diameter between the portion in contact with the web and the portion not in contact with the web as the wear progresses. Since the portion not in contact with the web is relatively less worn, the roll diameter is larger than that in the portion in contact with the web. Therefore, the calender linear pressure tends to increase in the portion that is not in contact with the web, and therefore the elastic deformation of the roll accompanying the rotational movement under high pressure conditions tends to increase the temperature due to the generated heat. The resin-made calender roll may burst at a high temperature, and in order to prevent this, it is necessary to replace the calender roll before excessive wear. Therefore, the replacement of the calendar roll is carried out within a certain period, which is empirically determined to be safe.

However, since the replacement work of the calendar roll requires a lot of time, in order to improve the production efficiency,
It is necessary to develop a device that facilitates calendar roll replacement work and a device that grasps an appropriate calendar roll replacement time. In addition, due to some factors, some calender rolls reach the thermal limit within a certain empirical period, and if they are left unattended, roll rupture and other accidents are likely to occur.
When an accident occurs, it takes a lot of time and cost to deal with it, so it is also necessary to detect the accident in advance and appropriately replace the calendar roll.

[0004]

SUMMARY OF THE INVENTION Therefore, the object of the present invention is to produce a super calendar device by grasping the wearability of the calendar rolls in the super calendar device and performing appropriate calender roll replacement based on that. It is an object of the present invention to provide a method for detecting roll wear in a super calendar device and an apparatus therefor capable of improving the wearability.

[0005]

As a result of extensive studies in view of the above, the present inventor has invented a method for detecting wear of a calendar roll in a super calendar apparatus of the present invention and an apparatus therefor.

That is, the method for detecting the wear of the calender rolls in the super calender apparatus of the present invention comprises the steps of measuring the calender roll surface temperature A at the web contact portion and measuring the calender roll surface temperature B at the non-web contact portion. And a step of calculating the surface temperature A and the surface temperature B, calculating a temperature difference between the surface temperature A and the surface temperature B measured during the calendar operation, and the temperature difference being a preset value. Above, or when the surface temperature B exceeds the allowable temperature of the calendar roll, this is detected, and it is determined that the wear of the calendar roll is in the extreme state.

The calender roll wear detecting device in the super calendar device of the present invention comprises means for measuring the calender roll surface temperature A at the web contact portion and means for measuring the calender roll surface temperature B at the web non-contact portion. And a means for calculating the surface temperature A and the surface temperature B, and a means for outputting a signal output from the calculation device to the outside.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A method for detecting wear of a calendar roll and a device therefor in a super calendar device of the present invention will be described below.

FIG. 1 is a schematic view showing an example of a calender roll wear detecting device in a super calendar device of the present invention. In the present invention, in FIG. 1, a roll surface temperature measuring device 1 for a web contact portion, a roll surface temperature measuring device 2 for a web non-contact portion, a computing device 3, and an external output device 4 are included.

The roll surface temperature measuring device 1 at the web contact portion and the roll surface temperature measuring device 2 at the web non-contact portion in the present invention are all temperature measuring devices capable of measuring the surface temperature of an object in a non-contact state. .

The arithmetic unit 3 in the present invention can receive the measurement results of the respective surface temperatures measured by the roll surface temperature measuring device 1 at the web contact portion and the roll surface temperature measuring device 2 at the web non-contact portion. Is a general computer that has an arithmetic function and is capable of transmitting to the external output device 4.

The external output device 4 according to the present invention is a general device which issues a screen display, light, vibration and alarm.

After a certain period of time has passed during the calendar operation, the roll surface temperature measuring device 1 at the web contacting portion and the roll surface temperature measuring device 2 at the non-web contacting portion of the calender roll 5 are located respectively at the portions where the web 6 exists. The surface temperature (A) of the roll itself and the roll surface temperature (B) of the portion of the calendar roll 5 where the web 6 does not exist are measured.

Here, the calendar rolls 5 are all rolls used in the super calendar device. For example, a metal roll, a resin roll, a rubber roll, etc. are mentioned.

The arithmetic unit 3 calculates the difference between the temperature measured by the roll surface temperature measuring device 1 at the web contact portion and the temperature measured by the roll surface temperature measuring device 2 at the web non-contact portion, and the calculated value is equal to or greater than a preset value. Then, the signal is transmitted to the external output device 4. The arithmetic unit 3 also sends a signal to the external output unit 4 when the temperature measured by the roll surface temperature measuring device 2 at the non-contact portion of the web is equal to or higher than a preset value.

When the external output device 4 receives a signal from the arithmetic device 3, the external output device 4 notifies the worker using the external output means.

[0017]

EXAMPLES Example 1 Hereinafter, a method for detecting roll wear in a super calendar apparatus of the present invention and its apparatus will be described with reference to Examples. The present invention is not limited to these embodiments and can be variously modified.

FIG. 2 is an enlarged schematic view showing an example of an embodiment of the wear detecting device for the calendar roll in the super calendar device of the present invention. In FIG. 2, a roll surface temperature measuring device 11 for a web contact portion, a roll surface temperature measuring device 12 for a web non-contact portion, a computing device 13, and an external output device 14 are provided, and a super calendar device having 12 stages of calendar rolls is shown. The web 16 is conveyed to all stages. The calender roll wear detecting device in the super calender device of the present invention is installed on the fourth calender roll 15 from the top. The roll surface temperature measuring device 11 at the web contact portion and the roll surface temperature measuring device 12 at the web non-contact portion are provided with HO.
A RIBA TH-550 radiation thermometer was used. A PC / AT compatible computer was used as the arithmetic unit 13, and a radiation thermometer and an RS232C cable were used for connection. In addition,
As the external output device 14, a display on the screen of a PC / AT compatible computer is used instead.

After a certain period of time has passed since the calender was operated, the calender roll temperature reaches a thermal equilibrium state, whereby the method of the present invention becomes effective. Since this fixed time period differs depending on the super calendar, it is necessary to observe the temperature progress from the start of operation in advance. It was confirmed that the target machine reached the thermal equilibrium state in about 2 hours when it was stopped for 6 hours or more, and in about 20 minutes when it was not stopped. It should be noted that the temperature of the web and the temperature of the calender roll do not reach the thermal equilibrium state until a certain period of time passes after the calender operation is stabilized, so it is premised that the thermal equilibrium state is reached.

After a certain period of time, the roll surface temperature measuring device 11 at the web contact portion measures the temperature of the web portion in contact with the web 16 of the calendar roll, and the roll surface temperature measuring device 12 at the web non-contact portion calenders. Measure the temperature of the non-web portion of the roll that is not in contact with the web. The two temperature measuring devices constantly transmit the measured temperature to the arithmetic unit 3.

The arithmetic unit 3 monitors the temperature difference between the roll surface temperature A at the web contact portion and the roll surface temperature B at the web non-contact portion using the received temperature. Roll surface temperature A
The temperature difference between the roll surface temperature B and the roll surface temperature B tends to increase as the wear of the calendar roll progresses, and the arithmetic unit 3 outputs a warning signal when the temperature difference exceeds a set value. Further, the arithmetic unit 13 monitors the roll surface temperature B of the non-contact portion of the web, and outputs a warning signal when the roll surface temperature B exceeds the calender roll allowable temperature.

Since the set value of the temperature difference on the roll surface differs depending on the place where the calendar roll is installed, the operating conditions, the processing brand, etc. It is necessary to measure the change with time. In Example 1, the set value of the temperature difference was 20 ° C.

The allowable temperature of the calender roll depends on the material of the calender roll used. In Example 1, a resin-made calender roll was used, and there was a tendency for it to burst at a temperature of 80 ° C. or higher in the past, so the allowable temperature of the calender roll was set to 78 ° C.

[0024]

According to the method and apparatus for detecting roll wear in the super calendar apparatus of the present invention, the roll surface temperature A at the web contact portion and the roll surface temperature B at the web non-contact portion are measured, and the temperature difference between them is measured. Alternatively, by monitoring the permissible temperature of the roll surface temperature B, the wear state of the calendar roll can be grasped, and the proper calendar roll replacement time can be managed, so that the productivity can be improved by the super calendar.

[Brief description of drawings]

FIG. 1 is a schematic view showing an example of an abrasion detecting device for a calendar roll in a super calendar device of the present invention.

FIG. 2 is an enlarged schematic view showing an example of an embodiment of the wear detecting device for a calendar roll in the super calendar device of the present invention.

[Explanation of symbols] 1, 11 Roll surface temperature measuring device for web contact 2, 12 Roll surface temperature measuring device for non-contact web 3, 13 arithmetic unit 4, 14 External output device 5,15 calendar rolls 6, 16 web

Claims (2)

[Claims] 1. A method for detecting wear of a calender roll in a super calender apparatus, the step of measuring a calender roll surface temperature A at a web contact portion, the step of measuring a calender roll surface temperature B at a web non-contact portion, Comprising a step of calculating the surface temperature A and the surface temperature B,
When the temperature difference between the surface temperature A and the surface temperature B measured during the calendar operation is calculated, and the temperature difference is equal to or more than a preset value, or the surface temperature B exceeds the allowable temperature of the calendar roll, A method for detecting wear of a calender roll in a super calender device, which is characterized by detecting this and judging that the calender roll wear is in an extreme state. 2. A calender roll wear detecting device for a super calender device, comprising means for measuring a calender roll surface temperature A at a web contact portion, means for measuring a calender roll surface temperature B at a web non-contact portion, and An apparatus for detecting wear of a calendar roll in a super calender apparatus, comprising: a means for calculating the surface temperature A and the surface temperature B; and a means for outputting a signal output from the calculation device to the outside.