JP2001055681A - Heating press roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the deformation of a roll shell in a heating press roll, uniformly dewater a wet web and effectively heat up the wet web by a simple constitution. SOLUTION: This heating press roll is capable of heating and pressurizing a wet web in a press part of a paper machine and equipped with a roll shell 11 capable of nipping the wet web in cooperation with opposite rolls and dewatering the wet web and stiffeners 18 stood nearly perpendicularly to the axial center line of the roll shell 11 in the interior of the roll shell 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heated press roll for heating and pressurizing wet paper in a press part of a paper machine.

[0002]

2. Description of the Related Art FIG. 6 shows an example of the configuration of a press part of a conventional paper machine. The press part presses and dewaters a wet paper 9 indicated by a broken line in FIG. As shown in FIG. 6, the press part includes suction press rolls 1-4, a center roll 5, a press roll 6, a plurality (four in this case) of felt belts (hereinafter referred to as felt) 27, and a felt 27. Passed and felt 27
(Here 9) felt rolls 8, which drive the
It is provided with a traveling roll 6a for forming a transport path for the wet paper web 9 after pressure dehydration.

[0003] The surface of the shell (body) of the suction press rolls 1 to 4 is coated with an elastic material such as rubber having a thickness of about 25 mm, for example. An innumerable number of holes (for example, about 3 to 8 mm in diameter) are provided. A negative pressure is supplied to the inside of the shells of the suction press rolls 1 to 4 from an external device (not shown). Thereby, the suction press rolls 1 to 4 can squeeze moisture from the wet paper web 9 conveyed on the shell into the shell through the holes on the shell surface.

[0004] The center roll 5 and the press roll 6
In order to maintain the paper surface characteristics of the wet paper web 9 because it directly contacts the wet paper web 9, a stone roll made of granite with good paper releasability that does not stick to the wet paper web 9 that was in contact was used before. In order to deplete resources, recently, a metal roll sprayed with ceramics such as alumina has been used.

[0005] The wet paper web 9 is conveyed from a former (not shown) to a press part. Since the wet paper 9 has low strength, as shown in FIG. 6, the wet paper 9 is conveyed while being sandwiched between two felts 27, 27 or adhered onto one felt 27 in the press part. The wet paper web 9 is first sent between the suction press rolls 1 and 2 and is pressurized / dewatered at the position P1 by the suction press rolls 1 and 2,
Then, the suction press roll 2 and the center roll 5
(Position P2), between the suction press roll 3 and the center roll 5 (position P3), and between the suction press roll 4 and the press roll 6 (position P4).
Pressurized / dewatered. Thereafter, the wet paper web 9 passes between the press roll 6 and the traveling roll 6a, is sent to a dryer part (not shown), and is dried.

In the press part, it is important to perform pressure / dehydration so that the moisture distribution of the wet paper web 9 becomes uniform in the width direction. Therefore, each of the rolls 1 to 6 considers the deflection due to its own weight in advance, and the roll disposed below the conveyance path of the wet paper web 9 has its roll diameter in the width direction (the direction of the roll axis). In general, the diameter of the roll is changed so as to form a crown shape having the maximum diameter at the center. Conversely, the roll disposed above the transport path of the wet paper web 9 is generally formed in a shape such that the center roll diameter in the roll axis direction is the smallest at the center. As a result, when the roll surface is bent downward by its own weight, the roll surface becomes horizontal, and the wet paper 9
Can be uniformly pressed.

[0007] These rolls are usually arranged in pairs with the conveyance path of the wet paper web 9 interposed therebetween, and are pressed against each other. Therefore, the upper and lower rolls facing each other with the wet paper web 9 interposed therebetween are pressed against each other. The shape of each roll is not limited to the above, as long as the rolls sometimes come into contact with each other with an equal pressure. In order to make the pressing force of each of the rolls 1 to 6 uniform in the width direction, it is important to suppress the deformation of each of the rolls 1 to 6 at the time of pressurization as much as possible.

FIGS. 7A and 7B are schematic diagrams particularly showing a center roll (hereinafter simply referred to as a roll) 5 as an example of the configuration of the rolls 5 and 6 shown in FIG. The roll 5 includes a steel roll shell 11 forming a circumferential surface of the roll 5, steel roll heads 13, 13 forming a circular side surface of the roll 5 and connected to the roll shell 11 by bolts 20, Roll shaft 13a connected to each roll head 13 on the same axis as the roll shell 11
Each of the roll shafts 13a is rotatably supported by a roll bearing 14 supported by a support (not shown). On the outer peripheral surface of the roll shell 11, a ceramic sprayed layer 12 of, for example, about 1000 μm is formed.

[0009] In roll 5 in such steel, as in previous granite stone roll has been used, 1370 mm outer diameter (roll diameter) D _R of the roll 5, the roll surface length L _R and 6000mm (here 10 N / mm) predetermined linear load to the same extent as stone roll deformation amount when acts is the thickness of the roll shell 11 (roll shell thickness) t _R must be set to 110mm Currently, rolls of such dimensions are used.

By the way, the dewatering efficiency by pressurization is as follows.
It has been found that the efficiency of dehydration depends on the viscosity of the water contained in the water, and that the lower the viscosity, the higher the dehydration efficiency. Therefore, FIG.
In the press part as shown in FIG. 1, a heating medium such as steam is introduced into the center roll 5, for example, so that the wet paper web 9 and the center roll 5 come into contact with each other at a position P2.
The wet paper web 9 is heated between P3, whereby the viscosity of the water contained in the wet paper web 9 is reduced, and the subsequent pressurization / dehydration can be performed effectively.

A center roll (hereinafter, also simply referred to as a roll) 5a shown in FIGS.
The roll 5 shown in FIG.
This was modified as a heated press roll that heats the same. In other words, the roll (heating press roll) 5a is
As shown in (a) and (b), similarly to the roll 5, a steel roll shell 11, a ceramic sprayed layer 12 provided on the outer periphery of the roll shell 11, and bolts 20 are connected to the roll shell 11. Steel roll head 13,1
3 and roll shafts 13 a, 13 a rotatably supported by the respective roll bearings 14. Further, a pipe 1 for introducing steam into the roll shell 11 is provided.
5, Fixed siphon (hereinafter also simply called siphon) 1
6 are interposed.

The pipe 15 for introducing steam is one side [FIG.
(A) The right side of the roll shaft 13a to the roll shell 1
The steam for heating the roll shell 11 is supplied from an external steam supply source (not shown) through the pipe 15. Further, the siphon 16 is for discharging the vapor that has been introduced from the pipe 15 and condensed to become a drain, and the siphon 16 is connected to the inside of the roll shell 11 from the roll shaft 13a (left side in FIG. 8A). The inside of the roll shell 11 is bent so that its tip faces perpendicularly to the inner peripheral surface of the roll shell 11.

On the inner peripheral surface of the roll shell 11, a groove 31 is formed over the entire circumference at a position facing the siphon 16, and drains gather in the groove 31. The drain can be drained out. Further, the siphon 16 has a position adjusting mechanism (not shown), and the tip of the siphon 16 is finely adjusted in the direction of separation and contact with respect to the groove 31 by the position adjusting mechanism. Fine adjustment of the gap with the inner peripheral surface (groove 31) of the roll shell 11], the thickness of the drain inside the roll shell 11 can be adjusted.

The pipe 15 and the siphon 16 are supported by a mechanical seal 17 provided at an insertion portion into the roll shaft 13a. Since the position of the pipe 15 and the siphon 16 is fixed with respect to the rotation of the roll shaft 13a, the mechanical seal 17 supports the pipe 15 and the siphon 16 so as to be relatively movable with respect to the rotating roll shaft 13a. The connection between the pipe 15 and the roll shaft 13a and the connection between the siphon 16 and the roll shaft 13a are sealed so that the steam inside the roll shell 11 introduced from the pipe 15 does not leak.

The roll diameter D _R , roll surface length L _R , and roll shell thickness t _R of the roll 5a are the same as those of the roll 5 (D _R = 1370 mm, L _R = 6000 mm,
t _R = 110mm).

[0016]

However, the above-described heating press roll (center roll) 5a [FIG.
(A) and (b)] cannot be applied to a current paper machine having a high speed. That is, the heating press roll 5a is used in place of the center roll 5 in the press part shown in FIG. 6, and steam of 0.5 MPa is introduced into the heating press roll 5a at a gauge pressure to obtain a basis weight of 64 g / m2.
^When the wet paper web 9 is dehydrated, in order to raise the wet paper web 9 by a predetermined temperature (here, about 20 ° C.) between the positions P2 and P3, the papermaking speed of the paper machine must be reduced to 200 m / min. However, for this reason, the paper making speed is high (for example, 1000
This is not applicable to current paper machines (of the order of m / min).

[0017] Thus, as a result of various investigations of causes that can not be effectively temperature rise wet paper 9 to be lowered to 200 meters / min and machine speed, roll shell thickness t _R
(= 110 mm) was found to be the cause. Then, in order to raise the temperature of the wet paper web 9 by 20 ° C. in the current paper machine at a speed of about 1000 m / min, it was found that the roll shell thickness t _R had to be reduced from 110 mm to about 40 mm or less.

However, during operation, the roll shell 11 is deformed by applying pressure, and when the roll shell thickness t _R is reduced in order to reduce the thermal resistance, the strength of the roll shell 11 is reduced. , Such a roll shell 1
As a result, the wet paper web 9 cannot be uniformly pressed. As described above, the deformation characteristic and the heating characteristic of the roll shell 11 have a trade-off relationship, and it is very difficult to achieve both.

By the way, Black Clawsonn Kennedy Ltd.
Proposes a press roll capable of suppressing bending deformation (deformation of an axial center line, hereinafter referred to as beam deformation) as a beam generated during operation by increasing the roll diameter (for example, 1.5 to 3 m). [Kenneth Walker; Advance
s in hot pressing technology, Tappi Journal (Aug,
1990), pp. 99-101], but with such a press roll, for example, a roll diameter of 3 m and a roll shell thickness of 40 m.
Assuming that m, when a linear pressure (linear load) of 10 N / mm is applied to this heated press roll, the beam deformation is greatly reduced, but the shell deformation (deformation of the cross-sectional shape of the roll shell, which is essentially circular) For example, the deformation of the object becomes, for example, a rice ball shape) is greatly increased.
The deformation amount is about eight times that of the roll 5 shown in (a) and (b). Therefore, it is difficult to use such a press roll under conditions that require a high papermaking speed and a high linear pressure, and cannot solve the above-described problems. In fact,
There is no record of delivery of such a press roll used in a machine having a sheet forming speed of 500 m / min or more.

Valmet also sells heated press rolls as shown in FIG. As shown in FIG. 9, the heating press roll includes a roll shell 111 having an outer peripheral surface coated with ceramics or the like, and a roll shaft 113 rotatably supported by a bearing (not shown).
The inside of the roll shaft 113 is provided with a complicated circulation passage 113 a of high-temperature water. In addition, the roll shell 111 has a
A plurality of cylindrical passages (holes) 125 are provided in the axial direction, and the roll shell 111 can be efficiently heated by sending high-temperature water to these passages 125. The high-temperature water is forcibly circulated by a pump 130, and the steam flowing through the pipe 129 in the heat exchanger 128
After being heated indirectly through the passage 9, it is sent to each cylindrical passage 125 of the roll shell 111 through the rotary joint 127 and the circulation passage 113 a, and returns to the pump 130 through the circulation passage 113 a again. .

Although such a heated press roll can raise the temperature of the wet paper to some extent by the roll shell 111, it has a complicated structure and requires a heat exchanger 128, a pump 130 and the like. Would be expensive. In addition, since the sensible heat of water is used for heating, there is a problem that the temperature is likely to be uneven in the width direction of the roll shell 111, and the high-temperature water that is the heating source of the roll shell 111 is indirectly heated. Another problem is that the thermal efficiency of the entire system is low.

The present invention has been made in view of the above-described problems, and suppresses the deformation of the roll shell to uniformly dehydrate the wet paper, and to effectively raise the temperature of the wet paper with a simple configuration. It is an object of the present invention to provide a heated press roll.

[0023]

According to the present invention, there is provided a heated press roll according to the present invention for heating and pressurizing wet paper in a press part of a paper machine,
A roll shell for sandwiching the wet paper web and dewatering the wet paper web in cooperation with an opposing roll, and a stiffener standing upright in the roll shell substantially perpendicular to the axis of the roll shell. It is characterized by that.

According to a second aspect of the present invention, there is provided a heating press roll according to the first aspect, further comprising a steam introduction pipe for introducing steam into the inside of the roll shell, and a steam introduction pipe. The roll shell is characterized by having a drain discharge pipe for discharging a drain condensed by the vapor introduced into the inside of the roll shell. The heating press roll according to the third aspect of the present invention is the heating press roll according to the second aspect, wherein a groove for collecting the drain is provided on an inner peripheral surface of the roll shell, and a tip of the drain discharge pipe is provided. It is characterized by being introduced into the groove.

According to a fourth aspect of the present invention, there is provided the heating press roll according to the third aspect, wherein the stiffener is provided with a drain discharge hole for flowing the drain. I have. According to a fifth aspect of the present invention, there is provided the heating press roll according to any one of the first to fourth aspects, wherein the heat transfer performance of the roll shell is promoted on the inner peripheral surface of the roll shell. A spoiler bar is provided.

According to a sixth aspect of the present invention, there is provided a heated press roll according to any one of the first to third aspects, wherein the inner peripheral surface of the roll shell is provided with an axial center of the roll shell. An axial groove extending in a linear direction is provided. The heating press roll according to the present invention according to claim 7 is the heating press roll according to any one of claims 1 to 6, wherein the roll shell is made of a steel material, and the stiffener is welded to the roll shell. It is characterized by having been done.

According to an eighth aspect of the present invention, there is provided the heating press roll according to any one of the first to sixth aspects, wherein the stiffeners are connected to each other by a connecting member. Features. According to a ninth aspect of the present invention, there is provided a heating press roll according to the eighth aspect, wherein the roll shell is made of cast iron.

The heating press roll according to the present invention as set forth in claim 10 is the heating press roll according to any one of claims 1 to 3, wherein the heating press roll is provided between the inner peripheral surface of the roll shell and the stiffener. The roll shell is characterized in that fins are provided toward the axis of the roll shell. A heating press roll according to the present invention according to claim 11, wherein the roll shell is connected to an end of the roll shell in the heating press roll according to any one of claims 1 to 10. A flange portion for connecting the end member is formed on the inner periphery of the end of the roll shell, and the outer diameter of the stiffener is set to be smaller than the inner diameter of the flange portion. It is characterized by.

[0029]

Embodiments of the present invention will be described below with reference to the drawings. First, a first embodiment will be described. FIG. 1 is a schematic diagram showing a configuration of a heating press roll as a first embodiment of the present invention, and (a) is a partially cutaway front view (FIG. 6). (B) is a cross-sectional view taken along the line B1-B1 in (a).

The heating press roll of this embodiment is used in place of the center roll 5 in the press part of the paper machine shown in FIG. Press part is center roll 5
Except for the above, the structure is substantially the same as that of the press part of the conventional paper machine shown in FIG. 6, so that the press part will be described below with reference to FIG. The heating press roll of the embodiment will be described.

The heating press roll, as shown in FIG.
A roll shell 11 made of a steel plate (here, SM400) for pressing the wet paper 9 and a steel material (here, S35C) forming a circular side surface (a surface orthogonal to the axis of the roll shell 11) of the heating press roll. Roll head (end member) 13,
13 and a roll shaft 13a connected to each roll head 13 on the same axis as the roll shell 11 and rotatably supported by a bearing (not shown). A pipe (steam introduction pipe) 15 for introduction, a fixed siphon (drain discharge pipe, hereinafter also simply referred to as a siphon) 7 for discharging a drain condensed with steam introduced from the pipe 15, and a roll shell 11. A stiffener 18 made of a plurality of steel plates (here, SM400) standing substantially perpendicularly to the axis is provided.

The roll shell 11, as shown in FIG.
While the roll diameter D _R is formed in a fixed cylindrical in the width direction of the roll shell 11 (axial center line direction), as in the prior art, and the roll diameter is varied in the width direction by considering the deflection by its own weight Alternatively, it may be formed in a crown shape in which the roll diameter is maximum at the center, or in a shape in which the roll diameter is minimum in the center. Such a shape is appropriately selected so that the wet paper web 9 can be uniformly pressed in the width direction in cooperation with the opposed suction press rolls 2 and 3 (see FIG. 6).

As described above as a problem of the prior art, the conventional heating press roll 5a having a shell thickness t _R of 110 mm.
(See FIG. 8), even when a practical steam of about 150 ° C. is introduced into the heating press roll, the wet web 9 is in contact with the heating press roll between the positions P2 and P3 shown in FIG. 9
It is difficult to raise the temperature (about 20 ° C.) effective for dehydration. That is, the papermaking speed of a general paper machine at present is about 1000 m / min, and the time required for the wet paper web 9 conveyed at such a speed to pass between the positions P2 and P3 is 0.2 seconds or less. Therefore, in such a short time, the temperature of the wet paper web 9 cannot be sufficiently increased.

Even under such conditions, the shell thickness t _R is 1
By thinning from 10mm to about 40mm,
The temperature of the wet paper web 9 can be raised (about 20 ° C.) which is effective for dehydration, but in this case, the strength of the roll shell 11 is reduced. For this reason, the press rolls 2, 3
The magnitude (deformation amount) of the beam deformation and the shell deformation generated in the roll shell 11 by receiving the pressing force from (see FIG. 6) the conventional stone roll or the non-heated press roll 5 shown in FIG.
Is 10 times or more the deformation amount under the same condition.
In the press roll, a uniform pressure distribution in the width direction (that is, uniform pressurization of the wet paper web 9 in the width direction) is important. Can not.

Therefore, in the present heating press roll, while reducing the heat transfer resistance of the roll shell 11 by reducing the shell thickness t _R from the conventional 110 mm to 30 mm, the roll diameter D _R is increased from the conventional 1370 mm. By increasing the height to 1900 mm, the beam deformation can be suppressed to a predetermined level. By providing a plurality of stiffeners 18 inside the roll shell 11, the shell deformation can be suppressed to a predetermined level.

Here, the stiffener 18 will be further described. The stiffeners 18 are arranged at a substantially uniform pitch P _S in the axial direction of the roll shell 11 and are shown in FIG.
Are welded in a vertical posture to the inner peripheral surface of the roll shell 11 so as to oppose the pressing force received from the press rolls 2 and 3 shown in FIG. A plurality (eight in this case) of semi-circular drain discharge holes 19 are provided at a lower part (on the roll shell 11 side) of the stiffener 18 at a substantially equal pitch in the circumferential direction. Through the drain discharge hole 19 and flows into the siphon 7 near both ends of the roll shell 11. The number, shape, and the like of the drain discharge holes 19 are not limited thereto.

A coating layer 12 having excellent paper releasability is provided on the outer periphery of the roll shell 11, and the coating layer 12 is composed of a simple substance such as an oxide, a carbide, or a nitride, a ceramic of a mixture thereof, In this case, a nickel (Ni) plating layer for preventing the corrosion of the roll shell 11 and a paper separation property and a sheet resistance formed on the outer periphery of the nickel (Ni) plating layer are provided. A thermal sprayed layer having wear properties (here, WC-N
i sprayed layer). Note that a build-up welding layer of stainless steel may be provided instead of the nickel (Ni) plating layer.

At both ends of the inner peripheral surface of the roll shell 11, flange portions 11a projecting toward the axis of the roll shell 11 are provided.
And the flange portion 13b of the roll head 13 are joined by a plurality of bolts 20. Pipe 1 for steam introduction
5 is inserted into the roll shell 11 from one of the roll shafts 13a [right side in FIG. 1 (a)], and is used to heat the roll shell 11 from an external steam supply source (not shown) through the pipe 15. Steam is supplied. Further, the siphon 7 is for discharging the steam that has been introduced from the pipe 15 and that has become a drain by condensing the steam.
(Left in (a)) is introduced into the inside of the roll shell 11 from the hollow portion inside the roll shaft 13a, and its tip (the tip of the drain discharge pipe) has a posture perpendicular to both ends of the inner peripheral surface of the roll shell 11. Are provided with drain inlets 7a, 7a facing each other. In addition, on the inner peripheral surface of the roll shell 11, grooves 31 are formed over the entire circumference at positions opposing the suction ports 7a, 7a, and the suction ports 7a, 7a are introduced into the grooves 31. It gathers in the groove 31 and is efficiently discharged from the suction ports 7a, 7a.

Although the pipe 15 and the siphon 7 are of a fixed type and are not shown in FIG. 1, the mechanical seal 1 provided on the roll shaft 13a is similar to the prior art shown in FIG.
7 supported. The mechanical seal 17 supports the fixed-position pipe 15 and the siphon 7 so as to be relatively movable with respect to the roll shaft 13a that rotates during operation, and the siphon 7 and the siphon 7 so that the steam inside the roll shell 11 does not leak. The connection between the roll shaft 13a and the connection between the pipe 15 and the roll shaft 13a are sealed.

It should be noted, dimensions of the heating press rolls, roll diameter D _R is 1900 mm (FIG. 7, 1370 mm in the conventional warm press roll 5,5a 8), shell thickness t
_R is 30 mm (110 mm for the conventional heating press rolls 5 and 5a shown in FIGS. 7 and 8), and the roll surface length L _R is 600.
0 mm, the thickness t _s is 20 mm, the height h _s is 220mm of the stiffener 18, the pitch P _s of the stiffener 120 mm, the radius of the drain discharge hole 19 50 m of the stiffener 18
m, the depth of the groove 31 is 3 mm. In the coating layer 12, the thickness of the nickel (Ni) plating layer in the lower layer (roll shell 11 side) is 200 μm, and the thickness of the WC-Ni sprayed layer in the upper layer (outside) is 800 μm.

Further, as shown in FIG.
Outer diameter D _S of the becomes larger than the inner diameter D _F of the flange portion 11a provided at both ends of the inner roll shell 11 periphery.
For this reason, in order to weld the stiffener 18 to the inside of the roll shell 11, the stiffener 18 is divided and carried into the roll shell 11 from the flange portion 11a, or the flange portion 11a is divided from the roll shell 11. As a configuration, after welding the stiffener 18 into the roll shell 11,
The flange portion 11a is welded to the roll shell 11.

The heating press roll according to the first embodiment of the present invention is configured as described above. In order to confirm the temperature rising characteristics in such a configuration, a heating press roll was manufactured on a trial basis and FIG. Actual machine (press part) with the configuration as shown in
The test was conducted by incorporating the center roll 5 in place of the above. When a test was conducted by introducing steam at 150 ° C. into the heated press roll, the speed of the paper machine was increased to 1300 m.
/ Min, the position P2 shown in FIG.
The temperature of the wet paper was increased by 20 ° C. between P3. Also,
The portion where the stiffener 18 is welded, the height h _s of the stiffener 18 to the thickness t _R of the roll shell 11 is added as the thickness increase of the thermal resistance is concerned, the stiffener at the same size and the prototype The temperature rise characteristics of the prototype having no 18 attached were measured, and the adverse effect of the stiffener 18 on the temperature rise characteristics was investigated. As a result, when the stiffener 18 was present, the maximum paper making speed of the paper machine capable of raising the temperature of the wet paper web 9 by 20 ° C. between the positions P2 and P3 shown in FIG. 6 was about 1300 m / min. On the other hand, when there is no stiffener 18, the maximum speed is 1150m.
/ Min, which proves that the stiffener 18 is more excellent in the temperature rise characteristics.

Here, the reason why the provision of the stiffener 18 improves the temperature rise characteristics will be described. During operation, i.e., while the roll shell 11 is rotating around the axis, the drain inside the roll shell 11 causes the roll shell 1 to rotate due to centrifugal force.
1 A film is formed by sticking to the inner peripheral surface. That is, the heat transfer form of the inner peripheral surface of the roll shell 11 is a film-like condensation heat transfer, and the heat transfer coefficient is about 2.3 kw / m ² K. On the other hand, on the side surface of the stiffener 18, the condensed water droplets (drain) flow down the stiffener 18 one after another, and the heat transfer form is drop-shaped condensation heat transfer, and the heat transfer coefficient is 11.6 kW /.
m ² K or more. The stiffener 18 also functions as a fin.
The thermal resistance of the eight side surfaces is 1 / 2.6 of the inner peripheral surface of the roll shell 11, and the overall thermal resistance of the heated press roll is as follows.
In the case where the stiffener 18 is provided on the inner peripheral surface of the roll shell 11, the size is reduced by about 15% (the temperature rise characteristic is improved) as compared with the case where the stiffener 18 is not provided.

As described above, the maximum speed of the paper machine capable of raising the temperature of the wet paper web 9 by 20 ° C. between the positions P2 and P3 shown in FIG. 6 is as follows in the conventional heating press roll 5a shown in FIG.
In contrast to about 200 m / min, according to the present heating press roll, the pressure can be increased to 6.5 times or about 1300 m / min. Therefore, the paper making speed 10
There is an advantage that it can be applied to a current general paper machine of about 00 m / min.

The stiffener 1 is provided inside the roll shell 11.
There is also an advantage that such a temperature raising performance can be obtained by the relatively simple configuration of providing the heating element 8. Also,
This heating press rolls, compared with the conventional warm press roll 5a shown in FIG. 8, the roll diameter D _R is larger and shell thickness t
_R is thin. The larger the roll diameter D _R, also shell thickness t
Shell deformation tends to increase as _R is thinner. However, by interposing the stiffener 18 as a reinforcing material in the roll shell 11, such shell deformation is suppressed and the wet paper 9 is evenly pressed / pressed. There is an advantage that it can be dehydrated.

If the temperature of the wet paper web 9 can be raised by 20 ° C., the dryness N _DRY [N _DRY (%) = W
_p / (W _p + W _w ) × 100, W _p : weight of paper fiber in wet paper 9, W _w : weight of water in wet paper 9] can be increased by about 2%. This increase in such dryness N _DRY can reduce drying energy, for example, about 7% to 8% of the dry part disposed downstream of the press part. In order to dry the wet paper web 9 in the dry part, energy for the latent heat of evaporation of the moisture in the wet paper web 9 is required as the drying energy. On the other hand, the energy required to raise the temperature of the wet paper 9 at 20 ° C.
What is necessary is just to correspond to the change in sensible heat of the moisture therein, which is clearly smaller than the drying energy. Therefore, compared to the energy used for raising the temperature of the wet paper web 9 in the press part, the decrease in the energy used in the dry part is larger, and there is an advantage that the energy can be saved for the entire paper machine. .

Further, the roll diameter D _R, by which is larger than the conventional warm press roll 5a shown in FIG. 8, to reduce the beam deformation of the roll shell 11, also the contact of the roll shell 11 and the wet paper web 9 There is also an advantage that the time (that is, the time heated by the roll shell 11) increases. Also,
Since the stiffener 18 is provided with the drain discharge hole 19, there is also an advantage that the suction port of the siphon 7 can be reduced. In other words, when the drain discharge hole 19 is not provided in the stiffener 18, the drain is accumulated between the stiffeners 18, so that the drain of the siphon 7 is interposed between the stiffeners 18 in order to discharge the drain. A suction port must be provided, but stiffener 1
By providing the drain discharge holes 19 in the drains 8, the drains can be collected at both ends of the inner peripheral surface of the roll shell 11, and the drains can be discharged through the two suction ports 7 a, 7 a.

Also, the suction ports 7a, 7a of the siphon 7
The roll shell 11 is installed so as to enter the grooves 31 provided near the side end of the inner peripheral surface, and the drain collected in the grooves 31 can be efficiently discharged. There is. Next, a second embodiment will be described. FIG. 2 is a schematic diagram showing a configuration of a heating press roll as a second embodiment of the present invention.
(A) is a partially cutaway front view (a view corresponding to the view taken in the direction of arrow B6 in FIG. 6), (b) is a sectional view taken along the line B2-B2 in (a), and (c) is (b) 3) is an enlarged view of A2 part. Note that the same components as those described in the heating press roll of the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

The heating press roll of this embodiment is used in place of the center roll 5 in the press part shown in FIG.
As shown in FIG. 1C, in the heating press roll of the first embodiment (see FIGS. 1A and 1B), a roll shell 1 is provided.
1 is provided with a spoiler bar 21 for promoting the heat transfer characteristics of the roll shell 11 on the inner peripheral surface.
In other words, the heating press roll of the present embodiment has the configuration shown in FIG.
As shown in FIGS. 2A to 2C, a steel roll shell 11 and a coating layer 12 provided on the outer periphery of the roll shell 11 similar to the first embodiment (not shown in FIGS. 2A to 2C). , Roll heads 13, 13, and roll shafts 13 a,
13a and the same steam introducing pipe 1 as in the first embodiment.
5 (not shown in FIG. 2 (a)), siphon 7 for drain discharge (see FIG. 2 (b), not shown in FIG. 2 (a)), a plurality of stiffeners 18 and roll shell 11 The plurality of spoiler bars 21 attached to the inner peripheral surface [FIG.
2 (a) and 2 (c), not shown in FIG. 2 (b)].

The spoiler bar 21 is made of steel (for example, SS40).
0) and roll shell 1 between each stiffener 18
The roll shell 11 is attached in the axial direction and is arranged on the inner circumferential surface of the roll shell 11 at a substantially uniform pitch P in the circumferential direction. Here, the pitch P is set to 165 mm, and 35 spoiler bars 21 are attached to each other between the stiffeners 18 in the circumferential direction.

The spoiler bar 21 is a columnar member having a square cross-sectional shape.
[See FIG. 2 (c)] is 7 mm each, and the shaft length is 100 m.
m. As described above, during operation, the drain in the roll shell 11 is formed into a film by sticking to the inner peripheral surface of the roll shell 11 by centrifugal force, and the heat transfer of the inner peripheral surface of the roll shell 11 is performed by this liquid film thickness. The resistance increases. In the above-described heating press roll of the first embodiment, the heat transfer performance of the entire heating press roll is promoted by the effect of the stiffener 18, but the inner peripheral surface of the roll shell 11 serving as a film-shaped condensation heat transfer portion. The heat transfer resistance has not been improved. Therefore, the spoiler bar 21 is attached to promote the heat transfer of the inner peripheral surface of the roll shell 11 (the film-shaped condensation heat transfer portion).

That is, when the spoiler bars 21 are arranged in the circumferential direction at a predetermined pitch P set by the following formula (1), the drain accumulated between the spoiler bars 21 has the rotation of the roll shell 11. It is generally known that a resonance phenomenon excited by the vibration occurs to obtain a remarkable heat transfer promoting effect on the inner peripheral surface of the roll shell 11.
Also in the heating press roll of the present embodiment, the pitch P of the spoiler bar 21 is set to 165 mm according to the equation (1).

P = π (Rδ)^0.5 (1) where R in the expression (1) is a half of the inner circumference of the roll shell 11.
The diameter and δ are the dray accumulated between the spoiler bars 21
(Liquid film) thickness. Heated press row of this embodiment
The first embodiment is similar to the first embodiment except that the spoiler bar 21 is provided.
Roll diameter D_R(= 1
900mm), shell thickness t_R(= 30mm) and other dimensions
Is the same. Therefore, the radius of the inner periphery of the roll shell 11
R [= (D _R-2 x t_R) / 2] is 920 mm,
If the liquid film thickness δ is 3 mm, then from equation (1),
The pitch P of the boiler bar 21 is 165 m as described above.
m.

The heating press roll according to the second embodiment of the present invention is configured as described above. This heating press roll is prototyped, and the center roll 5 is used in an actual machine (press part) having the configuration shown in FIG. As a result, the maximum speed of a paper machine capable of raising the temperature of the wet paper web 9 by 20 ° C. between the positions P2 and P3 shown in FIG. 6 was about 1390 m / min. In the first embodiment,
Since the maximum speed of such a paper machine was about 1300 m / min, it was possible to increase the speed by about 7% compared to the first embodiment.

Therefore, by attaching the spoiler bar 21, the heat transfer promoting effect of the heating press roll can be improved by the first effect.
There is an advantage that it can be obtained more effectively than in the embodiment. Next, a third embodiment will be described. FIG. 6A is a schematic view showing a configuration of a heating press roll according to a third embodiment of the present invention. FIG. 6A is a partially cutaway front view (B6 in FIG. 6). FIG. 3B is a cross-sectional view taken along the line B3-B3 of FIG. 3A, and FIG. 3C is an enlarged view of a portion A3 of FIG. Note that the same components as those described in the heating press rolls of the first embodiment and the second embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

The heating press roll of the present embodiment is used in place of the center roll 5 in the press part shown in FIG. 6 similarly to the first and second embodiments, and FIG.
As shown in (a) to (c), in the heating press roll according to the first embodiment (see FIGS. 1A and 1B), the axial center line of the roll shell 11 is provided on the inner peripheral surface of the roll shell 11. It has substantially the same configuration as that provided with a groove (axial groove) 22 extending in the direction.

That is, the heating press roll is shown in FIG.
As shown in (a) to (c), a steel roll shell 11 having the same roll diameter D _R (= 1900 mm) as in the first and second embodiments, and provided on the outer periphery of the roll shell 11. The same coating layer 12 as in the first embodiment [FIG.
(A) to (c) are not shown], and the roll heads 13 and 1
3, roll shafts 13a, 13a, and a plurality of stiffeners 1
8, a steam introduction pipe 15 and a siphon 7 similar to those of the first embodiment (both not shown in FIGS. 3 (a) and 3 (b))
The groove 22 (shown schematically in FIG. 3B) is formed on the inner peripheral surface of the roll shell 11.
Are arranged at predetermined intervals a (here, 20 mm) in the circumferential direction (143 pieces in this case).

The groove 22 is formed on the inner peripheral surface of the roll shell 11 by machining, and has a depth c of 20 mm and a width b of 2 mm.
It is set to 0 mm. By providing the groove portions 22 in this manner, irregularities directed in the axial direction are formed on the inner peripheral surface of the roll shell 11, and the irregularities function as heat transfer fins, and the side surfaces of the irregularities are formed into a film-like shape. Since the condensation heat transfer is changed to the drop condensation heat transfer, the heat transfer characteristics of the roll shell 11 can be improved.

Further, in the heating press rolls of the first and second embodiments, the plate thickness (shell thickness) t _R of the roll shell 11 was 30 mm, whereas in the present heating press roll, The thickness of the groove bottom of the shell 11 (the thickness of the portion of the roll shell 11 where the groove 22 is provided) t
Is set to 20 mm, which is thinner than this, to further improve the heat transfer characteristics of the roll shell 11. However, in order to secure the strength of the roll shell 11, the shell thickness t
_R (= c + t) is set to 40 mm, which is thicker than the first and second embodiments, so that the beam deformation of the roll shell 11 that occurs during operation can be sufficiently suppressed.

The groove 22 not only improves the heat transfer characteristics of the roll shell 11, but also allows the drain inside the roll shell 11 to have a suction opening 7 a of the siphon 7 located near the side end of the inner peripheral surface of the roll shell 11. , 7a [FIG. 3
1 (a) and 1 (b), not shown, see FIG. 1 (a)]. For this reason, in the heating press roll of the present embodiment, like the heating press rolls of the first embodiment and the second embodiment, the stiffener 18 has a drain discharge hole 19 [see FIGS. 1 (b) and 2 (b)]. ] Is not provided.

The thickness t _s of the stiffener 18 is 20 m
m, the height h _s of the stiffener 18 is 220 mm, the pitch P _s of the stiffener is set to 120 mm. The heating press roll as the third embodiment of the present invention is configured as described above. This heating press roll is prototyped, and is replaced with a real machine (press part) having a configuration shown in FIG. As a result of the test, the maximum speed of the paper machine capable of raising the temperature of the wet paper web 9 by 20 ° C. between the positions P2 and P3 shown in FIG. 6 was about 1430 m / min. In the first embodiment, the maximum speed of such a paper machine is 1
Since the speed was about 300 m / min, the paper making speed could be increased by about 10% compared to the first embodiment.

Therefore, by providing the groove portion 22 on the inner peripheral surface of the roll shell 11 in the direction of the axis of the roll shell, the heat transfer promoting effect of the heated press roll can be more improved than in the first and second embodiments. Has the advantage that it can be obtained more effectively. In the above embodiment,
Although the groove 22 is formed so as to be directed to the axis of the roll shell 11, the groove 22 may not be completely directed to the axis of the roll shell 11.

[0063] Furthermore, the dimensions of the heating press roll is not limited to the above embodiments, for example, the roll diameter D _R 19
And 300 mm, the groove 22 40 mm depth c of, 30 mm and the groove bottom of the plate thickness t of the roll shell 11, 20 mm thickness t _s of the stiffener 18, the height h _s of the stiffener 18 20
0mm, the pitch P _s of the stiffener may be set to 120mm.

[0064] In the embodiments described above, the roll diameter D _R 19
Since the depth c of the groove 22 is set to 20 mm and the thickness t of the groove bottom of the roll shell 11 is set to 20 mm, the outer diameter D _S [= D _R −2 × (c + t)] of the stiffener 18 is 1820 mm. Becomes The thickness t _F of the flange portion 11a of the roll shell 11 requires a certain thickness (here, 65 mm) in consideration of the size of the bolt 20 attached to the flange portion 11a and the connection strength with the roll head 13. is, the inner diameter of the flange portion 11a D _F (= D _R -
2 × t _F ) is 1770 mm. Therefore, the outer diameter D _S (= 1820 mm) of the stiffener 18 is not
In order to carry the stiffener 18 into the roll shell 11 through the flange portion 11a, the roll shell 1 has to be larger than the inner diameter D _F (= 1770 mm) of the roll shell 1a.
One must divide.

Therefore, as described above, the roll diameter D_RTo
The depth is set to 1900 mm, which is the same as the above-described embodiment, and
Is 40 mm, and the thickness t of the groove bottom of the roll shell 11 is 3
By changing to 0 mm, the outer diameter D of the stiffener 18
_S[= D_R−2 × (c + t)] is 1760 mm.
Outer diameter D of tiffener 18_SIs the inner diameter D of the flange 11a. _F
(= 1770 mm). I
Therefore, without dividing the stiffener 18, the roll shell 1
1 for efficient assembly work
Become like

In such a dimension setting, a test was conducted in which a linear load of 10 N / mm was applied to the heated press roll, and there was no problem with the deformation. As a result of assembling into a real machine having the configuration shown in FIG. 6 and conducting a test, the maximum paper making speed of the paper machine capable of raising the temperature of the wet paper 9 by 20 ° C. between the positions P2 and P3 shown in FIG.
min, which is slightly lower than that of the above-described embodiment, but sufficiently higher than that of the related art.

Next, the fourth embodiment will be described.
FIG. 4 is a schematic view showing a configuration of a heating press roll as a fourth embodiment of the present invention, in which (a) is a partially cutaway front view (a view corresponding to a view taken in the direction of arrow B6 in FIG. 6). , (B) is a cross-sectional view taken along line B4-B4 of (a), (c) is A4 of (b).
It is an enlarged view of a part. The same components as those described in the heating press rolls of the first to third embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted.

The heating press roll of the present embodiment is used in place of the center roll 5 in the press part shown in FIG. 6 similarly to the first to third embodiments, and FIG.
As shown in (a) to (c), the configuration is substantially the same as that of the heating press roll of the third embodiment. That is, the heating press roll includes a roll shell 11 and a coating layer 1 provided on the outer periphery of the roll shell 11 as in the first embodiment.
2 (not shown in FIGS. 4A to 4C) and steel (for example, S
35C) and a roll shaft 13
a, 13a, a plurality of stiffeners 18, a steam introduction pipe 15 and a siphon 7 similar to those of the first embodiment [FIG.
(A) and (B) are not shown in the drawings). Further, similarly to the third embodiment, a groove 22 (schematically shown in FIG. 4B) is formed on the inner peripheral surface of the roll shell 11 along the axial direction of the roll shell 11 in a predetermined direction in the circumferential direction. A plurality (140 in this case) are arranged at intervals (land width) a (here, 20 mm), and the groove 2
2, the depth c is set to 20 mm, and the width b is set to 20 mm.

In the first to third embodiments, the roll shell 11 is made of steel, whereas in the present embodiment, the roll shell 11 is made of steel.
The roll shell 11 is made of cast iron (for example, FC350). Roll diameter D _R of the roll shell 11, the roll surface length L _R
Is the same as in the first to third embodiments (D _R = 190
0 mm, L _R = 6000 mm). However, since the Young's modulus of cast iron is as low as about 60% of that of steel, the strength of the roll shell 1 is low.
The thickness t of the groove bottom (the thickness of the portion of the roll shell 11 where the groove 22 is provided) t is set to 40 mm, which is thicker than the third embodiment in which the roll shell 11 is made of steel.

Further, the plurality of stiffeners 18 are penetrated by rod-shaped tie rods (connecting members) 23 and 24 which are arranged in two stages in the diameter direction at a plurality of positions (here, eight positions) in the circumferential direction of the stiffener 18. It is provided. The connection portions between the stiffeners 18 and the tie rods 23 on the upper stage (on the axis of the roll shell 11) and the tie rods 24 on the lower stage (on the inner peripheral surface of the roll shell 11) are welded.
Thus, the plurality of stiffeners 18 are integrally connected.

As described above, by connecting the plurality of stiffeners 18 by the tie rods 23 and 24 to form an integral body, the stiffener 18 can be easily pressed into the roll shell 11 and made of cast iron. Since it is difficult to weld the stiffener 18 to the roll shell 11, it is possible to stably install the stiffener 18 in the roll shell 11 without welding by using a stable configuration as described above. It is.

[0072] In addition, especially if the stiffener 18 is high (if the height h _s is large), the stiffener 18 is prone to back ring (that or twisted or distorted), but,
The tie rod 23 also has a function of preventing such buckling. Note that the tie rod 23 may be any as long as it can connect the plurality of stiffeners 18, and for example, may be divided in the axial direction. That is, a plurality of stiffeners 18 may be connected by arranging tie rods having a short axial length between the stiffeners 18 and welding the tie rods to the stiffeners 18 on both sides. Also, the tie rods need not be rod-shaped, but may be plate-shaped, for example.

During operation, steam is introduced into the roll shell 11, and the steam heats the roll shell 11 and the stiffener 18.
8 has a higher degree of expansion at a higher temperature than the roll shell 11. Therefore, during operation, because naturally a selfish interference from the roll shell 11 and stiffener 18, the outer diameter D _S of the stiffener 18 at the time of manufacture, the roll shell 11
It is not necessary to provide a tightening allowance slightly larger than the inner diameter of.

Since the thickness t of the groove bottom of the roll shell 11 is set to be as thick as 40 mm, the outer diameter D _S [= D _R −2 × (c + t)] of the stiffener 18 is relatively small 1780 mm. become (roll diameter D _R is 1900 mm, the depth c of the groove 22 20 mm). For example, the flange portion 11
If the thickness t _{F of the “a”} is about 60 mm, the flange portion 11
The inner diameter D _F (= D _R −2 × t _F ) of a is 1780 mm, and the stiffeners 18 can be brought into the roll shell 11 without being divided and connected by the tie rods 23 and 24. It is.

The heating press roll according to the fourth embodiment of the present invention is configured as described above. When a heating press roll is prototyped and subjected to a deformation test in which a line load of 10 N / mm is applied, It was confirmed that the deformation could be equivalent to that of a conventional stone roll or the non-heated press roll 5 shown in FIG. In addition, as a result of a test in which this heated press roll was incorporated in place of the center roll 5 in an actual machine having the configuration shown in FIG. 6, the positions P2 and P shown in FIG.
The maximum paper making speed of the paper machine capable of raising the temperature of the wet paper 9 by 20 ° C. between the three was about 1250 m / min. this is,
Although the speed is slightly lower than the maximum speed (1300 to 1430 m / min) of the steel roll shell 11 of the first to third embodiments, the speed is sufficiently higher than the conventional speed and the current high speed paper machine. It is a speed that can be applied sufficiently.

Therefore, the same strength and heat transfer promoting effect as those of the first to third embodiments can be obtained without using inexpensive cast iron and without welding the stiffener 18 to the inside of the roll shell 11. There is. Since the roll shell 11 and the stiffener 18 are not welded, a contact thermal resistance is generated between the inner peripheral surface of the roll shell 11 and the stiffener 18. It is presumed that the unevenness formed on the inner peripheral surface of No. 11 effectively functions as a fin, and the heat transfer promoting effect could be obtained as described above without being affected by the contact thermal resistance. You.

Next, a fifth embodiment will be described.
FIG. 5 is a schematic view showing a configuration of a heating press roll as a fifth embodiment of the present invention, in which (a) is a partially cutaway front view (a view corresponding to a view taken along arrow B6 in FIG. 6). , (B) is a sectional view taken along the line B5-B5 of (a), (c) is an A5 of (b).
It is an enlarged view of a part. The same components as those described in the heating press rolls of the first to third embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted.

The heating press roll of this embodiment is used in place of the center roll 5 in the press part shown in FIG. As shown in FIGS. 5A to 5C, the heating press roll is made of steel (for example, S
M400) roll shell 11 and roll shell 11
A coating layer 12 (not shown in FIGS. 5A to 5C) provided on the outer periphery of the first embodiment, roll heads 13 made of steel (for example, S35C), and roll shafts 13a, 13a, a plurality of stiffeners 18, a steam introduction pipe 15 and a siphon 7 (both not shown in FIGS. 5A and 5B) similar to those of the first embodiment. between the inner circumferential surface and the stiffener 18 of the shell 11, a relatively high toward the axial line of the roll shell 11 (the height C ₁ large) fins 32
[In FIG. 5B, schematically shown], a plurality (here, 103) are juxtaposed at equal pitches in the circumferential direction.

The fins 32 are made of steel (here, SS400).
Then, the base is welded to the roll shell 11 and attached.
Roll shell as well as promote heat transfer
The rigidity of the roll shell 11 in the axial direction
It suppresses beam deformation. Each of the above embodiments
Then, in order to enhance the heat transfer effect, the shell thickness t _R
And shell thickness t_RLow strength due to thinning
Below is the roll diameter D_RIs compensated by making it larger than before.
Was. On the other hand, in this heating press roll, each of the above
Similar to the embodiment, the shell thickness t_RThinner
Is the roll diameter D_RIs 1370 mm, the same as the
Thickness t_RThe decrease in strength due to the thinner
To make up for it.

Further, there is a gap between each of the plurality of fins 32.
However, the groove 22a is formed, and the inside of the roll shell 11 is formed.
The drain passes through these grooves 22a and rolls
Grooves 31 provided near the side end of the inner peripheral surface of the shell 11
It is designed to flow into. Here, the fins
32 height C₁ Is 195 mm and the width a of the bottom of the fin 32 is a
₁ Is 20 mm, the width a of the top of the fin 32_TwoIs 14mm,
Width b of bottom of groove 22a ₁ Is 20 mm, at the top of the groove 22a.
Width b_TwoIs set to 14 mm. In addition, Rorche
The thickness t of the groove bottom of the groove 11 is 3 thicker than the third embodiment.
0 mm, so that, together with the fins 32,
Rule diameter D_RReduction in strength against beam deformation due to shrinkage
I try to make up for it.

The stiffener 18 is welded to the top of the relatively high fin 32 (the end of the roll shell 11 on the axial center line side). As shown in FIGS. 5A and 5B,
Outer diameter D _S of the stiffener 18 is sufficiently smaller than the inner diameter D _F of the flange portion 11a of the roll shell 11, the stiffener 18 is inserted from the flange portion 11a without being divided into the roll shell 11, sequentially, the fins 32 To be welded.

The stiffener 18 has a predetermined pitch P
48 _s (120 mm) are arranged in the circumferential direction.
Outer diameter D _S of the stiffener 18 is 920 mm, an inner diameter of 720
mm, height h _s is 100mm, the thickness t _s is set to 20mm. Heating the press roll as the fifth embodiment of the present invention is constituted as described above, the roll diameter D _R
Is set to 1370 mm, which is the same as the conventional one, the stiffener 1
8. By the action of the fins 32, the amount of deformation during operation can be made equal to that of a conventional stone roll or the non-heated press roll 5 shown in FIG. In addition, this heating press roll is
As a result of a test in which the center roll 5 was incorporated into the actual machine in the configuration shown in FIG.
The maximum speed of the paper machine capable of raising the temperature of the wet paper 9 by 20 ° C. between P3 was about 1100 m / min. Although this is slightly smaller than the maximum speed of the steel roll shell 11 of each of the above-described embodiments, the maximum speed (200 m / min) of the conventional heated press roll shown in FIG.
It is 6.5 times faster than the above, and is a speed that can be sufficiently applied to the current high-speed paper machine.

Therefore, the roll diameter D _R is set to 1
Even if it is 370 mm, there is an advantage that the temperature of the wet paper web 9 can be sufficiently increased when applied to a current high-speed paper machine. In the heating press roll, the papermaking machine capable of raising the temperature of the wet paper web 9 by 20 ° C. is slower than the above embodiments because the roll diameter D _R is small. It is presumed that the contact time with No. 9 is shortened.

The fins 32 need not be completely oriented in the axial direction of the roll shell. Further, the heating press roll of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. For example, in each of the above-described embodiments, the stiffener is configured by a plurality of ring-shaped members.
For example, one or a plurality of spiral shapes may be used. In this case, the stiffener can be easily manufactured.

In each of the above-described embodiments, the connection between the roll shell 11 and the roll head 13 is made by fastening the bolt 20. However, the connection may be made by welding. Further, in each of the above-described embodiments, the siphon 7 has two suction ports 7a.
What is necessary is just to be able to drain the drain inside evenly,
Therefore, three or more suction ports 7a may be provided. In addition, when the suction port 7a of the siphon 7 is increased, the drain shell 31 is provided in the roll shell 11 correspondingly.
May be added.

The dimensions (eg, the depth of the drain collecting groove 31 provided in the roll shell 11, the stiffener height h _s , the pitch P _s , the thickness t _s, etc.) shown in each embodiment. Alternatively, the material may be changed as long as there is no structural problem. Further, the siphon 7 may be changed from a fixed type to a rotary type in which the suction port 7 a of the siphon 7 rotates together with the roll shell 11.

[0087]

As described in detail above, in the heating press roll according to the first aspect of the present invention, a stiffener that stands substantially perpendicular to the axis of the roll shell is provided inside the roll shell. Therefore, when the wet paper is heated and pressed, there is an advantage that the deformation of the roll shell is suppressed by the stiffener, and the wet paper can be uniformly pressed and dewatered.

In the heating press roll according to the second aspect of the present invention, since the stiffener functions as a fin, the roll shell is efficiently heated by steam through the stiffener, whereby the stiffener is provided in the roll shell. With such a simple configuration, there is an advantage that the temperature of the wet paper can be effectively raised. In addition, since the roll shell is reinforced by the stiffener, the heat resistance of the roll shell can be reduced by reducing the wall pressure of the roll shell. In this case, the heat of the steam inside the roll shell is efficiently reduced. In addition, there is an advantage that the temperature is transmitted to the outer peripheral surface of the roll shell and the temperature of the wet paper can be more effectively increased.

In the heating press roll according to the third aspect of the present invention, the drain gathers in the groove provided on the inner peripheral surface of the roll shell, and the drain gathered in the groove forms the tip of the drain discharge pipe introduced into the groove. Has the advantage of being efficiently discharged from The heating press roll according to the present invention has an advantage that the drain can be efficiently collected by collecting the drain at a predetermined location through a drain discharge hole provided in each stiffener.

In the heating press roll according to the present invention, the thermal resistance of the liquid film formed by the drain on the inner peripheral surface of the roll shell is reduced by the action of the spoiler bar provided on the inner peripheral surface of the roll shell. Thereby, there is an advantage that the temperature of the wet paper can be more effectively raised. In the heating press roll according to the present invention, the minimum wall pressure of the roll shell can be reduced by providing the axial groove on the inner peripheral surface of the roll shell. And the temperature of the wet paper can be more effectively raised.

In the heating press roll according to the present invention, since the roll shell is made of steel, there is an advantage that the stiffener can be easily attached to the roll shell by welding. In the heating press roll according to the present invention, since the stiffeners are connected to each other by the connecting member, there is an advantage that the stiffener can be stably installed in the roll shell.

In the heating press roll according to the ninth aspect of the present invention, since the roll shell is made of cast iron, it is difficult to weld the stiffener to the roll shell, but the stiffeners are connected by a connecting member. Therefore, there is an advantage that the stiffener can be stably installed in the roll shell without welding. In addition, since the roll shell is made of inexpensive cast iron, there is an advantage that a heated press roll can be manufactured at low cost.

In the heating press roll according to the present invention, a fin is provided between the inner peripheral surface of the roll shell and the stiffener, the fin being directed toward the axis of the roll shell. Since the heat transfer is promoted, there is an advantage that the temperature of the wet paper can be more effectively raised. Further, since the fins reinforce the roll shell, there is an advantage that the diameter of the roll shell can be reduced accordingly.

In the heating press roll according to the present invention, since the outer diameter of the stiffener is set to be smaller than the inner diameter of the flange, the stiffener is not divided and the inner diameter of the roll shell is larger than that of the flange. This has the advantage that the work of assembling the heated press roll is facilitated.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a configuration of a heating press roll as a first embodiment of the present invention, in which (a) is a partially cutaway front view (a view corresponding to a view taken along arrow B6 in FIG. 6). (B) is a cross-sectional view taken along the line B1-B1 in (a).

FIG. 2 is a schematic view showing a configuration of a heating press roll as a second embodiment of the present invention, wherein (a) is a partially cutaway front view (a view corresponding to a view taken in the direction of arrow B6 in FIG. 6). ) And (b) are cross-sectional views taken along line B2-B2 of (a), and (c) is A2 of (b).
It is an enlarged view of a part.

3A and 3B are schematic views showing a configuration of a heating press roll as a third embodiment of the present invention, and FIG. 3A is a partially cutaway front view (a view corresponding to a view taken in the direction of arrow B6 in FIG. 6). ) And (b) are cross-sectional views taken along line B3-B3 in (a), and (c) is A3 in (b).
It is an enlarged view of a part.

4A and 4B are schematic views showing a configuration of a heating press roll according to a fourth embodiment of the present invention, in which FIG. 4A is a partially cutaway front view (a view corresponding to an arrow B6 in FIG. 6); ) And (b) are cross-sectional views taken along line B4-B4 in (a), and (c) is A4 in (b).
It is an enlarged view of a part.

5A and 5B are schematic views showing a configuration of a heating press roll as a fifth embodiment of the present invention, in which FIG. 5A is a partially cutaway front view (a view corresponding to a view taken along arrow B6 in FIG. 6). ) And (b) are cross-sectional views taken along arrows B5-B5 in (a), and (c) is A5 in (b).
It is an enlarged view of a part.

FIG. 6 is a schematic side view showing an example of a configuration of a press part of a conventional paper machine.

FIG. 7 is a schematic view showing a general configuration of a roll used for a press part of a conventional paper machine, particularly as a configuration of a center roll, and FIG. 7 (a) is a cross-sectional view (FIG. (A figure corresponding to the view as viewed from the arrow B6), (b) is a view corresponding to B7 in (a).
It is sectional drawing in the -B7 arrow direction.

FIG. 8 is a schematic view showing a configuration of a center roll capable of being heated by steam used in a press part of a conventional paper machine;
FIG. 7A is a cross-sectional view (a view corresponding to the view taken in the direction of arrow B6 in FIG. 6) viewed from the front, and FIG.

FIG. 9 is a schematic side view showing a main configuration of a conventional heating press roll together with a steam and high-temperature water system (partly cut away).

[Explanation of symbols]

 Reference Signs List 5 Center roll 7 Fixed siphon (drain discharge pipe) 7a Drain suction port 11 Roll shell 11a, 13a Flange section 12 Coating layer 13 Roll head (end member) 13a Roll shaft 15 Pipe for steam introduction (steam introduction pipe) Reference Signs List 17 mechanical seal 18 stiffener 19 drain discharge hole 20 bolt 21 spoiler bar 22, 22a groove portion (axial groove portion) 23, 24 tie rod (connecting member) 31 groove portion 32 fin

Claims (11)

[Claims] 1. A heating press roll for heating and pressurizing a wet paper in a press part of a paper machine, wherein a roll shell for sandwiching the wet paper and dewatering the wet paper in cooperation with an opposing roll. And a stiffener standing substantially perpendicularly to the axis of the roll shell inside the roll shell. 2. A steam supply pipe for introducing steam into the roll shell, and a drain discharge pipe for discharging a drain condensed from the steam introduction pipe into the roll shell. The heated press roll according to claim 1, wherein: 3. The heating according to claim 2, wherein a groove for collecting the drain is provided on the inner peripheral surface of the roll shell, and a tip of the drain discharge pipe is introduced into the groove. Press roll. 4. The heating press roll according to claim 3, wherein the stiffener is provided with a drain discharge hole for flowing the drain. 5. The roll shell according to claim 1, wherein a spoiler bar for promoting heat transfer performance of the roll shell is provided on an inner peripheral surface of the roll shell. Hot press roll. 6. The roll shell according to claim 1, wherein an inner circumferential surface of the roll shell is provided with an axial groove extending in a direction of an axis of the roll shell. Hot press roll. 7. The heated press roll according to claim 1, wherein the roll shell is made of steel, and the stiffener is welded to the roll shell. 8. The heated press roll according to claim 1, wherein the stiffeners are connected to each other by a connecting member. 9. The heated press roll according to claim 8, wherein the roll shell is made of cast iron. 10. The roll shell according to claim 1, wherein a fin is provided between the inner peripheral surface of the roll shell and the stiffener so as to extend toward an axis of the roll shell. The heated press roll as described. 11. The roll shell includes an end member with a roll shaft connected to an end of the roll shell, and a flange portion for connecting the end member is formed on an inner periphery of the end of the roll shell. The heating press roll according to any one of claims 1 to 10, wherein an outer diameter of the stiffener is set to be smaller than an inner diameter of the flange portion.