JPS6269897A - Calender and analogue apparatus thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a calender device commonly used in paper machines and paper finishing machines, or a similar device.

(Prior art) A calender device in a paper machine is installed at the rear of a dryer, and is used to make the paper dried in the dryer smooth and uniform in volume, and send it to a reel so as to obtain a uniform winding. The front view of the calendar device and the front schematic view of the rear part of the dryer are shown.

As shown in the figure, a conventional calender device has several intermediate rolls 2 on top of a bottom roll 1. 3. 4. 5 (four in this illustrated example) and top rolls 6 are stacked vertically and in parallel in sequence, and each of these rolls is supported at both ends by bearings.

In order to obtain good paper quality, this type of calender device has been known in the art (Japanese Publication No. 4) in which the crown of the roll group is adjustable.
A variable crown roll (hereinafter referred to as CC roll) (see Japanese Patent Publication No. 3-23043) or a hot water roll for adjusting the paper temperature is used.

In the figure, the CC roll is the bottom roll 1 or the third intermediate roll 4 (shown as an example).

It may also be placed in other positions. ), and hot water rolls are placed at the 1st, 2nd, and 4th intermediate rolls 2, 3,
5. and are arranged at each arrangement position of the top roll 6.

The paper coming out of the dryer enters between the fourth intermediate roll 5 and the top roll 6, passes through each intermediate roll in sequence, and is sent out from between the bottom roll 1 and the first intermediate roll 2 to the reel for the next process. It will be done. In the meantime, in order to give the paper smoothness and uniform bulk, the temperature of the hot water rolls is adjusted and the nip pressure of each roll is adjusted.

Operating conditions vary depending on paper type, but recently, high temperatures and
There is a growing trend towards low nip operation. The purpose of this is to improve the smoothness by raising the temperature and maintain the bulk by reducing the nip (ensuring uniform bulk without crushing the paper).

By the way, in such conventional paper machines, since there is a distance between the dryer and the calender, the temperature of the paper leaving the dryer is lowered before entering the calender. For this purpose, conventionally, a hot water roll is installed in the calender roll to heat the paper, but this requires a certain amount of thermal energy.

Further, since both the front and back sides of the paper passing between the calender rolls are alternately in contact with the roll surfaces and exposed to the atmosphere, the sheet surface temperature changes each time. At the edge of the sheet (both edges), the roll surface that is not in contact with the sheet is always in contact with the atmospheric temperature, so it tends to become cold, and as a result, there is a difference in temperature between the center and edge of the sheet. will occur.

Furthermore, when the rolls are arranged vertically, the nip pressure is determined by the weight of these rolls, making it impossible to achieve a low nip pressure. Furthermore, since there is a portion of the roll surface that is constantly exposed to the atmosphere, it is easily affected by room temperature.

(Problems to be Solved by the Invention) As mentioned above, in this conventional seed force L/ND device,
Because the calender roll group is exposed to the atmosphere, it is easily affected by it (and in order to maintain it at a high temperature, heating rolls such as hot water rolls have to be installed, which consumes more heat energy than necessary. In addition, during calendering, the sheet snakes between rolls in the atmosphere, so the front and back surfaces of the sheet are alternately heated and cooled by the atmosphere, making it difficult to maintain a constant temperature. Since both ends of the roll are always open to the atmosphere, a temperature difference occurs between the center and the ends of the roll, resulting in uneven temperature distribution in the width direction of the sheet.

In addition, since the calender roll group is arranged vertically, the two-tub pressure is affected by the weight of the rolls, making it impossible to reduce the nip.

The above points go against the recent trend of trying to improve paper quality by calendering at high temperatures and low nip pressures, and are problems that should be resolved immediately.

The present invention solves these problems all at once, realizes high-temperature, low-nip-pressure calender operation, improves paper quality, and also effectively utilizes the thermal energy of other devices to save energy. The present invention aims to provide a calendar device that is cost-reduced.

(Means for Solving the Problems) Therefore, the present invention provides a calender and similar devices for making paper smooth and uniform in bulk, in which a large number of rolls are aligned with their axes on the same horizontal plane and parallel to each other. In order to solve the above-mentioned problems, the roll group is provided with a control means for controlling the nip pressure thereof, and the roll group is fixedly fixed on the heat insulation panel. be.

(Function) Since a pressure means is provided to keep the roll group horizontal and to control the nip pressure, and at the same time, the roll group is surrounded by a heat insulating panel, the weight of the rolls does not act on the two-tube portion, and the nip pressure between the rolls is reduced. It is possible to reduce the temperature to a desired value, and since the roll group is not exposed to the atmosphere, the inside of the heat insulation panel can be maintained at the desired high temperature, and temperature unevenness between rolls and along the roll axis is eliminated. In particular, since the roll group is horizontally arranged, it can be integrally connected to a dryer, which is a previous process, and in this case, the amount of heat in the dryer section can be used effectively.

(Example) Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

1 to 3 are a side view, a top view, and a side view of a calendar device according to the present invention.

In the figure, one fixed roll 12, four intermediate rolls 13, 14, 15, .
16 (four rolls are shown in the illustrated example, but the number is not necessarily limited to this), and pressure rolls 17
are being installed sequentially.

Either the fixed roll 12 or the pressure roll 17,
Alternatively, CC rolls are used for both, or rolls that have been previously crowned are used. intermediate rolls 13, 14,
As 15 and 16, those having a hollow cell structure in which the roll temperature can be controlled by passing warm water, hot water, or cooling water into the inside of the roll, or those having other suitable structures are used.

Furthermore, a conventionally known double shoe CC roll (see Japanese Patent Publication No. 49-22843) may be installed as an intermediate roll if necessary.

Note that the arrangement of the fixed roll, intermediate roll, and pressure roll is not limited to this example, and their positions can also be reversed.

The fixed roll 12 is mounted at both ends by bearings 18, 113' mounted on the frame 11° 11', and each intermediate roll 13, 14, 15.16 and the pressure roll 17 is also mounted at both ends by rotatable pivots 20, 20. 'Through bearing 19
, 19'. Each pivot 20, 20
' is installed at a position eccentric from the center of gravity of the roll.

The pressure device 21.21' is a bearing 19.1 of the pressure roll 17.
9', each intermediate roll 13,1
A nip pressure fine adjustment device 22.22' is provided at the lower part of the bearings 19, 19' of 4, 15, and 16. This nip pressure fine adjustment device 22.degree. 22' may be installed as needed, and may not be necessary.

The above is based on the patent application No. 1274/1989 proposed by the applicant earlier.
It is similar to the calendar device of No. 7 (Japanese Unexamined Patent Publication No. 58-131031), and it is also possible to use this device.

However, in this example, the roll 12.13.14°15.1
6. Drive pulleys 23 are provided at all shaft ends of 17,
The drive boot I is connected via a belt by a drive device (not shown).
It is designed to transmit power to J23.

All these rolls are surrounded by an upper insulation panel 24 and a lower insulation panel 25. Each thermal panel 24.25
can also be a heating panel with its own heating function. The heat retaining panel may be heated by steam, electric heat, or the like, or may be configured to blow hot air from within the panel.

The thermal panels 24, 25 can also be divided into several zones perpendicular to the paper flow, and the temperature can be adjusted individually in each zone.

The upper panel 24 is movable above the calender rolls by a suitable lifting device (not shown), and the lower panel 25 is either fixed or movable downward by a hanging device (not shown).

In this way, according to this embodiment, the calender roll is surrounded by a heat-retaining panel, so it is not affected by the atmospheric temperature and has little heat radiation, so it is always maintained at a constant temperature with no unevenness, and the paper can be passed between calender rolls without undergoing temperature changes on the front and back sides, and is effective for improving smoothness.

In particular, if the heat-retaining panel is a heating type panel that can control the temperature, it is possible to create a temperature gradient in the calender roll and sheet, such as decreasing the temperature sequentially from the inlet side to the outlet side, for example, from the inlet side to the outlet side. At this time, the quality of the paper can be further improved by controlling the temperature appropriately depending on the paper type and papermaking speed.

In addition, by arranging the calender rolls horizontally, as in the above-mentioned Japanese Patent Application No. 57-12747, an increase in nip pressure due to the weight of the rolls can be avoided, and the nip can be reduced regardless of the number of rolls and the number of knobs. By increasing the number of tubes, smoothness can be improved and the volume can be controlled appropriately.

Furthermore, by making the calender device horizontal, the inlet side of the calender device can be brought close to the dryer part, and can be integrated with the rear end of the dryer as described later.

When the calender roll is stopped (when the roll is not rotating), it naturally bends due to the weight of the roll. At the start of operation, if the rolls are brought into contact with each other and rotated while they are still bent, local contact points will occur, causing damage to the roll surface, heat generation due to strong contact, or vibration, which is inconvenient. Therefore, at the start of operation, the rolls are in a non-contact state,
While rotating each independently and removing the above deflection,
At the same time, it is heated so as to eliminate temperature unevenness between the rolls and in the direction of the roll axis.

In addition, by circulating hot water through the intermediate roll, the temperature can be raised from the inside and outside of the roll, shortening the time required to raise the temperature.Furthermore, since the outer periphery of the roll is kept warm by a heat insulating panel, the amount of heat dissipated is small, leading to energy savings.

Next, a second embodiment of the present invention will be described.

FIG. 4 shows this embodiment, in which the calender device according to the first embodiment described above is directly connected to the rear end of the dryer part.

That is, openings 27 formed by the upper and lower panels 24, 25 open into the dryer hood 26 to allow hot air within the dryer hood 26 to flow into the panel.

Further, a damper (not shown) for controlling the amount of heat can be provided in the opening 27 to adjust the heat flow and maintain the inside of the panel at an appropriate temperature.

By integrally connecting the rear end of the dryer and the calender device in this way, the paper dried in the dryer enters the calender device without coming into contact with the ambient temperature and lowering its temperature. As a result, the ambient temperature can be maintained at the same level between the dryer and the calender, and the paper temperature is kept constant without changing, so that the paper quality can be stabilized and improved more than in the first embodiment.

Figure 5 shows an example in which the present invention is applied to a breaker stack for a paper machine.As shown in the figure, the main body is made up of two rolls arranged horizontally and covered with a heat insulating panel. It is the same as the example. That is, one of the two rolls is fixed via a bearing, and the other one is supported at both ends by bearings that are horizontally pressed by a pressure device via a pivot. The cough pivot is eccentric from the center of gravity of the roll.

In this example as well, by using a heat insulating panel and arranging the rolls horizontally, it is possible to stabilize the roll temperature and reduce the nip at the same time.

(Effects of the Invention) As described in detail above, according to the present invention, the roll group is arranged horizontally and in parallel, and the roll group is surrounded by a heat insulation panel, so that the nip pressure can be freely controlled, and at the same time the roll This makes it possible to efficiently increase the temperature of
It has become possible to lower the nip pressure, increase the number of nips, eliminate temperature unevenness in the roll group, and also easily control the temperature of the roll group, making it possible to obtain high-quality paper with smoothness and uniform bulk. It is possible.

In addition, since the roll group is horizontally arranged, the calendering device according to the present invention can be easily connected and integrated with the dryer in the previous process by installing a heat insulation panel. The high-temperature atmosphere can be used as is in the calendar section, making it even more effective in terms of thermal efficiency and energy saving.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view of a calender device showing an embodiment of the present invention, Fig. 2 is a plan view of the same, Fig. 3 is a front view of the same, and Fig. 4 shows a state in which the calender device is connected to a dryer. FIG. 5 is a side view of a breaker stack according to another embodiment of the present invention, and FIG. 6 is a side view of a conventional dryer and calender device. Description of main parts of figures 12, 13.14.15.16.17. - Roll 21
．． 21' -m-Pressure device 24.25-Heat insulation panel patent applicant Mitsubishi Heavy Industries, Ltd. Figure 1 Figure 2

Claims (1)

[Claims] Calenders and similar devices for making paper smooth and of uniform bulk include a control means for arranging a large number of rolls with their axes on the same horizontal plane and parallel to each other and controlling their nip pressures. , and a calendar and similar devices thereof, characterized in that the group of rolls is surrounded by a heat insulating panel.