JPH0514193U - Headbox for paper machine - Google Patents

Abstract

(57) [Summary] [Purpose] A paper machine capable of electrically measuring the waviness of the bottom lip and controlling the temperature in the width direction of the bottom lip so that the bottom lip is flattened based on the measured value. Provide a head box for. [Structure] A measurement chamber 15 continuous in the width direction (direction perpendicular to the drawing of FIG. 1) and a plurality of heating chambers 16 partitioned in the width direction are formed in the lower portion of the bottom lip 11. Further, the proximity sensors 17 are attached to the lower surface of the bottom lip 11 at a plurality of positions in the width direction in the measurement chamber 15, and the piano wire 18 is provided immediately below the proximity sensor 17 in the measurement chamber 15 in the width direction.
Install (detection wire). Further, in each heating chamber 16, a liquid 19 having a high boiling point is sealed as a heat medium, and an electric heater 20 (heating device) is individually arranged so as to individually heat the liquid 19 in each heating chamber 16. To do.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a head box for a paper machine.

[0002]

[Prior Art]

 FIG. 5 shows an example of a conventional head box for a paper machine. The stock 6 (the pulp is introduced from the header 1 to the rip outlet 5 through the manifold 2, the mixing chamber 3, the honeycomb tube unit 4, etc. Finely crushed and liquefied) with the top lip 7 and the top lip blade 8 to adjust the thickness unevenness in the width direction (direction perpendicular to the drawing), and the breast roll 9 moves in the direction of arrow A. The ink is discharged onto the net 10.

The bottom lip 11 that forms the lip outlet 5 together with the top lip 7 and the top lip blade 8 is made flat, but is deformed by the heat of the paper material 6 during operation to generate undulations. Therefore, a heating chamber 12 that is continuous in the width direction is formed below the bottom lip 11, and hot water 13 is circulated and supplied to the heating chamber 12 so as to even out the temperature distribution of the bottom lip 11 and suppress the undulation. I am doing it.

However, actually, even if the hot water 13 is circulated to the heating chamber 12 as described above, the undulations of the bottom lip 11 cannot be eliminated, and the undulations still remain in the bottom lip 11. ..

Therefore, conventionally, the thickness distribution in the width direction of the paper material 6 discharged from the lip outlet 5 is measured, and the top lip 7 and the top lip blade 8 are arranged so that the thickness distribution becomes uniform. I adjusted it according to the swell of the bottom lip 11.

[0006]

However, in the above-mentioned conventional method, even if the thickness distribution in the width direction of the paper stock 6 discharged from the lip outlet 5 can be made uniform, the paper stock 6 is wavy. As a result of this undulation, there is a possibility that the fiber orientation may be obliquely formed at an angle with respect to the lengthwise direction of the paper stock 6 (the left-right direction in the figure), and the quality of the product may be deteriorated. It was. That is, when the paper stock 6 having fiber orientation as described above is commercialized and used as, for example, computer paper or fax paper, the paper sent out from the device is gradually deviated from the feeding direction to the fiber orientation direction. There is a risk that paper jams and other problems may occur easily.

The present invention has been made in view of the above-mentioned circumstances, and the waviness of the bottom lip can be electrically measured, and the bottom lip is flattened based on the measured value in the width direction of the bottom lip. It is an object of the present invention to provide a head box for a paper machine capable of controlling the temperature of the paper.

[0008]

[Means for Solving the Problems]

 According to the present invention, a measurement chamber continuous in the width direction and a plurality of heating chambers partitioned in the width direction are formed under the bottom lip, and proximity sensors are attached to the bottom surface of the bottom lip at a plurality of positions in the width direction. Further, a detection wire rod is stretched right under the proximity sensor in the width direction, the heating medium is enclosed in each heating chamber, and a heating device is arranged. is there.

[0009]

[Action]

 Therefore, in the present invention, when the distance to the detection wire is measured by the proximity sensor at each position in the width direction, the undulation state of the bottom lip is determined based on the measured value. Further, by individually heating the heat medium in each heating chamber by the heating device based on the measured value, the temperature in the width direction of the bottom lip can be controlled, and the bottom lip can be flattened. Become.

[0010]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show an embodiment of the present invention, in which the same reference numerals as those in FIG. 5 represent the same parts.

In the paper machine head box 14 having substantially the same structure as the paper machine head box of FIG. 5, the bottom lip 11 is continuously formed in the width direction (the direction perpendicular to the drawing of FIG. 1). And a plurality of heating chambers 16 partitioned in the width direction.

Further, proximity sensors 17 are attached to the lower surface of the bottom lip 11 in the measurement chamber 15 at a plurality of positions in the width direction, and a piano wire 18 (directly below the proximity sensor 17 in the measurement chamber 15 across the width direction). A detection wire) is stretched (see FIGS. 1 and 2).

Further, a liquid 19 having a high boiling point is sealed as a heat medium in each heating chamber 16, and an electric heater 20 (heating device) is provided so that the liquid 19 in each heating chamber 16 can be individually heated. Are individually arranged (see FIGS. 1 and 3).

Further, as shown in FIG. 4, each proximity sensor 17 is connected to a control device 21 provided at a required place, and each electric heater 20 is connected to a power source 23 via a current controller 22, The command signal 24 output from the control device 21 can be input to the current controller 22. Here, in the control device 21, the undulation state of the bottom lip 11 is determined based on the measurement value of each proximity sensor 17, and in the current controller 22, the output from the control device 21 is output. The electric current value for each electric heater 20 is adjusted so that the swell of the bottom lip 11 is eliminated by receiving the command signal 24.

When the proximity sensor 17 at each position in the width direction measures the distance x to the piano wire 18 (see FIG. 2), the controller 21 determines the swelling state of the bottom lip 11 based on the measured value. Then, the command signal 24 is output to the current controller 22. The current controller 22 adjusts the current value to each electric heater 20 based on the command signal 24, and controls the temperature of the liquid 19 in each heating chamber 16 so that the swell of the bottom lip 11 is eliminated.

Therefore, according to the above-described embodiment, the swell of the bottom lip 11 can be electrically measured by measuring the distance x with respect to the piano wire 18 by the proximity sensor 17 at each position in the width direction. Since it is possible to flatten the bottom lip 11 by controlling the temperature in the width direction of the bottom lip 11 based on the measured value, the fiber orientation is inclined at an angle with respect to the length direction of the stock 6. It is possible to eliminate problems such as those that occur and to significantly improve product quality.

The head box for a paper machine according to the present invention is not limited to the above-described embodiment, the detection wire is not limited to a piano wire, the heat medium may be gas, and the heating device is an electric heater. It is needless to say that the heater is not limited to the heater, and that various changes can be made without departing from the scope of the invention.

[0019]

[Effect of the device]

 According to the head box for a paper machine of the present invention, the waviness of the bottom lip can be electrically measured by measuring the distance to the detection wire by the proximity sensor at each position in the width direction, and based on the measured value. Since the bottom lip can be flattened by controlling the temperature in the width direction of the bottom lip, the problem that the fiber orientation is obliquely formed at an angle with respect to the length direction of the stock is eliminated. It is possible to achieve an excellent effect that the product quality can be significantly improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a view taken along line II-II in FIG.

FIG. 3 is a view in the direction of arrows III-III in FIG.

FIG. 4 is a flow sheet of an embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a conventional example.

[Explanation of symbols]

 11 Bottom Lip 15 Measuring Room 16 Heating Room 17 Proximity Sensor 18 Piano Wire (Detection Wire) 19 Liquid (Heat Medium) 20 Electric Heater (Heating Device)

Claims (1)

[Scope of utility model registration request] 1. A measurement chamber continuous in the width direction and a plurality of heating chambers partitioned in the width direction are formed in the lower portion of the bottom lip,
Proximity sensors are attached to the bottom lip bottom surface in the width direction at a plurality of locations in the measurement chamber, and a detection wire is stretched immediately below the proximity sensor in the width direction to enclose the heating medium in each heating chamber and to provide a heating device. A headbox for a paper machine, which is characterized by being provided.