JPH0583675B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention provides a felt cleaning method for removing deposits from an endless felt in a press section of a paper machine for making paper and paperboard, and The present invention relates to an apparatus for carrying out the method.

[Prior art]

Conventionally, the endless felt in the press section of a paper machine loses water permeability due to the growth of deposits over a wide area as it is used, reducing the dewatering efficiency of the felt, resulting in paper breakage and printing problems. This is the cause of pitting.

Therefore, as methods to prevent these problems, there have been methods to spray high-pressure water of about 20 to 50 kg/cm ² onto the felt surface to clean it, spray high-pressure high-temperature water onto the felt surface to clean it, and apply a cleaning agent to low-pressure hot water. A method has been proposed in which the felt is washed by mixing it with the felt.

[Problem to be solved by the invention]

However, all of the above-mentioned conventional methods have advantages and disadvantages in their effectiveness, and as a result, it has not been possible to maintain the felt in an ideal state.

For example, in the conventional method of spraying high-pressure water of about 20 to 50 kg/cm ² onto the felt surface,
Since the method uses a detergency method in which high-pressure water of about 50 kg/cm ² is sprayed, there is a problem that hair removal of the felt is accelerated and the service life is shortened. Additionally, problems include the need for maintenance and rusting of the paper machine due to splashed water.

Furthermore, cleaning methods using high-pressure, high-temperature water are not generally popular due to economic problems caused by the use of high-temperature water, in addition to the problems of using high-pressure water.

In addition, the method using low-pressure hot water and cleaning chemicals has problems such as inability to clean dirt deep within the felt due to insufficient penetration of the hot water and cleaning chemicals due to insufficient pressure.

The present invention has been made to solve the above problems.

An object of the present invention is to provide a technique that can clean even deep dirt on felt.

Another object of the present invention is to provide a technique that can reduce hair loss of felt during felt washing.

The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a felt cleaning device for a paper machine that mixes a cleaning agent in hot water and sprays it on a papermaking felt so that the cleaning agent penetrates deep into the felt. a supply port for supplying normal water, a nozzle through which the water supplied from the supply port passes, a steam supply port for supplying steam, and a mixer for mixing the water and steam supplied from the nozzle and the steam supply port. , a cleaning agent supply device that sucks a cleaning agent into the mixed hot water mixed in the mixer, an air supplier that sucks air that stabilizes the pressure discharged from the mixer, and a cleaning agent supply device that sucks a cleaning agent into the mixed hot water mixed in the mixer; The present invention is characterized in that it consists of a mixing pressure booster configured with a pressure booster that mixes and pressure-increases water, and a shower nozzle device connected to a wash water supply port of the mixing pressure booster.

The shower nozzle device is composed of a header that supports a nozzle, and a pipe-shaped support body provided with a slit in the longitudinal direction that rotatably and replaceably supports the header.

[Function] According to the above-mentioned means, the temperature of the hot water is 60 to 90°C, and the injection pressure is 6 to 25 Kg/ ^cm2 , so
Dirt in the deep parts of the felt can also be cleaned, and hair loss on the felt can be reduced during felt cleaning.

It is composed of a mixing pressure intensifier that mixes and increases the pressure of ordinary water, steam, cleaning agents, and air, and a plurality of showerers.
Mixing of air, hot water of 60~90℃ and 6~25Kg/
Injection pressure of cm ² can be easily obtained.

〔Example〕

Hereinafter, one embodiment of the present invention will be specifically described using the drawings.

In addition, in all the figures for explaining the examples,
Components having the same function are given the same reference numerals, and the explanation of their operation will be omitted.

FIG. 1 is a schematic diagram of the press section of a paper machine for explaining an embodiment of the papermaking felt cleaning method of the present invention, and FIG. FIG.

In FIGS. 1 and 2, 100 is the wire section (Fourdrinier section) of the paper machine, 200 is the press section, and 300 is the wire section of the paper machine.
is the dryer section.

1 is a paper sheet, and a wire section 10 of the paper machine
0, passes through the press section 200 to the dryer section 300
It is now being transported towards.

2 is a press roll, 3 is a cheek roll,
This is for applying a mechanical load to the papermaking sheet 1 to remove moisture from the papermaking sheet 1. The cheek roll 3 has hollow holes containing one or two vacuum boxes 4 with a high degree of vacuum in order to recover moisture from the paper sheet 1.

5 is an endless felt, which serves as a press support for the papermaking sheet 1. This endless felt 5 has a guide roll 6 for guiding its running.
It is wound around a tension adjustment roll 7 for adjusting the tension of the endless felt 5.

8 is a felt suction device, and an endless felt 5
This is to collect moisture and deposits from the water.

Reference numeral 9 denotes a shower nozzle device for spraying pressurized hot water mixed with a cleaning agent toward the endless felt 5, and is connected to the mixing pressure increasing device 10. The mixing pressure increasing device 10 is a device for mixing and increasing the pressure of water, steam, cleaning agent, and air, and is for supplying this cleaning agent mixed pressurized hot water to the shower nozzle device 9 through the pressurized hot water supply pipe 11. be.

In the felt cleaning method of this embodiment, as shown in FIGS. 1 and 2, a paper sheet 1 is conveyed from the wire section 100 of the paper machine through the press section 200 toward the dryer section 300. At this time, the press roll 2 and cheek roll 3 of the press section 200 apply a mechanical load to the paper sheet 1 placed on the endless felt 5 to remove moisture from the paper sheet 1.

Then, water, steam, a cleaning agent which is a composition for moistening, softening and dispersing felt deposits, and air are mixed and pressurized by a mixing pressure increasing device 10. The pressurized hot water mixed with the cleaning agent is sprayed as pressurized hot water onto the surface of the endless felt 5 from the shower nozzle device 9 through the pressurized hot water supply pipe 11 . This results in
Resin from wood that adheres to endless felt 5, scale from industrial water, wax contained in waste paper, hot melt, foam plastic, latex, gummy substances, paper strength enhancers, sizing agents, pitch, filler, oil content , grease, slime, etc., are moistened and softened by hot water mixed with a cleaning agent, separated by pressure, and passed through the felt suction device 8.
recovered by.

The temperature of the pressurized hot water mixed with the cleaning agent is 60~90℃
The injection pressure is 6 to 25 Kg/cm ² . Further, the cleaning agent is a composition that moistens, softens and disperses the deposits on the felt, for example,
A solvent-based alkaline cleaning agent, an emulsion solvent-based neutral cleaning agent, an aromatic solvent-based alkaline cleaning agent, etc. are used. In this way, by setting the injection pressure to 6 to 25 kg/cm ² , it is possible to reduce hair removal of the endless felt 5 during felt cleaning.

FIG. 3 is a schematic diagram for explaining the outline of the overall configuration of an embodiment of the felt cleaning device of the present invention.

As shown in FIG. 3, the felt cleaning device of this embodiment includes a water supply pump 12 for supplying water from a water source to the mixing pressure booster 10, a water supply pipe 13,
Steam supply pipe 1 for supplying steam from a steam source
4. The cleaning agent pump 15 for supplying the cleaning agent from the cleaning agent tank 17, the cleaning agent supply pipe 16, the check valve 18, the air suction pipe 19, the check valve 20, the time of starting the mixing pressure booster 10, and A drain discharge pipe 21 for discharging overflow that occurs when the discharge pressure is unstable, that is, when the discharge pressure is unstable, a check valve 22, and a pressurized hot water supply for supplying pressurized hot water discharged from the mixing pressure booster 10. It consists of a pipe 11 and a shower nozzle device 9 for uniformly spraying pressurized hot water onto the surface of the endless felt 5.

FIG. 4 is a sectional view showing the detailed configuration of the mixing pressure booster 10 shown in FIG. 3.

As shown in FIG. 4, the mixing pressure booster 10 includes a water supply port 47, a nozzle 31 for generating a cylindrical water stream, and a handle 49 for moving the nozzle 31 up and down to adjust the amount of steam supplied. , steam supply port 48, mixing chamber 33 for mixing water and steam, drug injection port 40, gap 41, orifice 42,
Mixing pressure booster 35 for mixing and boosting the pressure of water, steam and cleaning chemicals, air inlet or overflow drain outlet 45, gap 46, minimum cross-sectional area 36 for maximally boosting the mixed fluid, expanding high-velocity fluid It is comprised of a diffusion section 37 for converting kinetic energy into pressure by

The operation of mixing water, steam, cleaning chemicals, and air and increasing the pressure by the mixing pressure increasing device 10 configured as described above will be described in detail.

3 and 4, the water stream supplied from the water source to the mixing pressure booster 10 by the water supply pipe 13 enters the nozzle 31 through the water supply port 47, where it forms a cylindrical water stream. Further, steam supplied from the steam source through the steam supply pipe 14 enters the mixing pressure booster 10 through the steam supply port 48 so as to surround the nozzle 31 .

The slit interval between the nozzle 31 and the mixing chamber 33 can be changed by moving the nozzle 31 up and down. The annular steam flow accelerated through the outside of the nozzle 31 collides with the water flow that has passed through the inside of the nozzle 31 in the mixing chamber 33 and condenses, thereby substantially transferring momentum from the steam to the water flow. .

After passing through the mixing chamber 33, this accelerated fluid passes through the mixing intensifier 35 and through the area of minimum cross section 36, at which point it reaches its maximum velocity. In the process of passing through the diffusion section 37, the kinetic energy of this fluid is converted into pressure, and the fluid is discharged as pressurized fluid.

Experiments have shown that in the mixing pressure booster 10, the pressure increase efficiency is better when the absolute pressure of the fluid discharge reaches four times or more the absolute pressure of the inflowing water. Injection of the cleaning agent takes place through a gap 41 located downstream of the mixing chamber 33 where the steam stream first contacts the water stream and upstream of the mixing intensifier 35 which focuses the fluid towards the area of minimum cross section 36.

Experience has shown that if the cleaning agent inlet 40 leading to the gap 41 is freely open to the atmosphere, the pressure increasing function of the mixing pressure increasing device 10 will stop due to air intrusion. .

Therefore, when injecting the cleaning agent, it is preferable to provide an orifice 42 for restricting air from entering the cleaning agent injection port 40.

By restricting the entry of air into the cleaning agent inlet 40, the fluid passing through the mixing chamber 33 creates a partial vacuum through the gap 41, which is used to transfer the cleaning agent to the agent inlet 40. can be drawn into the mixing pressure booster 10 from. Based on the same principle as the cleaning agent injection, the air intake port 45
Inhale the atmosphere from The air inlet 45 can be open to the atmosphere at all times. That is, the air inlet passage does not require an orifice for restricting the ingress of air.

The mixing pressure increasing device 10 is essential for increasing and stabilizing the discharge pressure by mixing atmospheric pressure air from the air intake port 45 into the mixed and pressurized fluid through the mixing pressure increasing section 35. It is a condition. It has been found through experiments that it works particularly efficiently when positioned upstream of the minimum cross-sectional area 36 by 2 to 5 times the diameter of the minimum cross-sectional area 36.

By configuring the mixing pressure booster 10 in this way, it is easy to obtain the usual mixture of water, steam, cleaning agent, and air, the hot water of 60 to 90°C, and the injection pressure of 6 to 25 kg/cm ² be able to.

FIG. 5 shows the shower nozzle device 9 shown in FIG.
FIG. 6 is a perspective view showing the shower attachment configuration of FIG. 5.

5 and 6, the shower nozzle device 9 includes a pipe-like support 51 having a slit 51A in the longitudinal direction, and shower nozzle headers rotatably provided at both ends of the pipe-like support 51. It is equipped with 52. This shower nozzle header 52 has a slit 51 in a pipe-like support 51.
A plurality of nozzles 53 are provided along A.
A pressurized hot water supply port 57 is provided at one end of the shower nozzle header 52, and the other end is closed.

The shower nozzle header 52 is inserted into a ring-shaped support 54 fixed at the center of the pipe-shaped support 51, and is rotatably supported. Both ends of the pipe-shaped support 51 are fixed by flanges 55. flange 55
is attached to the main body of the paper machine by an L-shaped fixing member 56.

By configuring the shower nozzle device 9 in this way, the pressurized hot water discharged from the mixing pressure booster 10 is supplied by the pressurized hot water supply pipe 11,
The pressurized hot water is supplied from the pressurized hot water supply port 57 to the shower nozzle header 52 and sprayed onto the surface of the endless felt 5.

At this time, since the shower nozzle header 52 can be rotated, the spray angle can be freely changed.

Although the present invention has been specifically explained above based on examples, it goes without saying that the present invention is not limited to the above-mentioned examples, and can be modified in various ways without departing from the gist thereof. .

〔Effect of the invention〕

As described above, according to the present invention, it is possible to clean dirt deep in the felt, and hair loss of the felt can be reduced during felt cleaning.

In addition, it is possible to easily obtain the usual mixture of water, steam, cleaning agent, and air, the hot water of 60 to 90°C, and the injection pressure of 6 to 25 Kg/cm ² .

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of the press section of a paper machine for explaining an embodiment of the papermaking felt cleaning method of the present invention, and FIG. FIG. 3 is a schematic diagram for explaining the outline of the overall configuration of an embodiment of the felt cleaning device of the present invention, and FIG. FIG. 5 is a partially cutaway perspective view of the shower nozzle device shown in FIG. 3, and FIG.
FIG. 6 is a perspective view showing the shower attachment configuration of FIG. 5; In the figure, 1... paper sheet, 2... press roll, 3
... cheek roll, 4 ... vacuum box, 5 ... endless felt, 6 ... guide roll, 7 ... tension adjustment roll, 8 ... felt suction device, 9 ... shower nozzle device, 10 ... mixing pressure booster, 11 ... pressurized hot water supply Pipe, 12... Water supply pump, 13... Water supply pipe, 14
...Steam supply pipe, 15...Cleaning chemical pump, 16...Cleaning chemical supply pipe, 17...Cleaning chemical tank, 18...Check valve, 19...Air suction pipe, 20...Check valve, 21...Drain discharge supply pipe, 22 ...Check valve, 31...Nozzle,
33...Mixing chamber, 35...Mixing pressure increaser, 36...Minimum cross-sectional area, 37...Diffusion part, 39...Pressurized hot water discharge port,
40...Cleaning agent injection port, 41...Gap, 42
... Orifice, 45 ... Air intake port or overflow drain outlet, 46 ... Gap, 47 ... Water supply port, 48 ... Steam supply port, 49 ... Handle, 51
A... Slit, 51... Pipe-shaped support, 52... Shower nozzle header, 53... Nozzle, 54... Ring-shaped support, 55... Flange, 56... L-shaped fixing member, 57... Pressurized hot water supply port.

Claims (1)

[Scope of Claims] 1. In a felt cleaning device for a paper machine that mixes a cleaning agent in warm water and sprays it onto papermaking felt so that the cleaning agent penetrates deep into the felt for cleaning, normal water is supplied. a supply port, a nozzle through which the water supplied from the supply port passes, a steam supply port that supplies steam, a mixer that mixes the water and steam supplied from the nozzle and the steam supply port, and the water that is mixed in the mixer. A cleaning agent supply device that sucks a cleaning agent into the mixed hot water, an air supplier that sucks air that stabilizes the pressure discharged from the mixer, and an intensifier that mixes and increases the pressure of the water, steam, cleaning agent, and air. 1. A cleaning device for papermaking felt, comprising a mixing pressure booster configured with a pressure vessel, and a shower nozzle device connected to a washing water supply port of the mixing pressure booster. 2. The papermaking felt cleaning device according to claim 1, wherein the shower nozzle device includes a header that supports a nozzle, and a pipe-shaped support provided with a slit in the longitudinal direction that supports the header in a rotatable and replaceable manner. A paper-making felt cleaning device characterized by comprising a body.