JP5824285B2 - Nozzle device - Google Patents

Description

  The present invention relates to a nozzle device, and more particularly to a nozzle device that can efficiently blow air and can apply a chemical solution to a traveling body with a high adhesion rate.

  In the paper industry, for the purpose of preventing the transfer of foreign materials derived from pulp raw material from the paper body, improving the paper separation, etc., for members such as paper machine wires, felts, dryer rolls, canvases, etc. A chemical solution containing chemicals such as a wet paper strength agent, a cleaning agent, a pitch control agent, an antifouling agent, and a release agent is used. This chemical solution is applied by a nozzle device attached to the paper machine.

However, in a paper machine, since the paper body travels at high speed in the paper machine, an air flow (hereinafter referred to as an “associated flow”) occurs along the movement of the paper body near the surface. A phenomenon occurs in which the chemical solution discharged toward the paper body by the nozzle device is wound up by the accompanying flow.
In this case, not only the chemical solution cannot be sufficiently applied to the paper body, but also the rolled up chemical solution adheres to the frame, the hood or the like and contaminates the paper machine.

  As a nozzle device for preventing the chemical liquid from rolling up, the present inventor has a discharge nozzle capable of discharging a chemical liquid, a first spray nozzle located upstream of the discharge nozzle, and a downstream side of the discharge nozzle. A nozzle device that includes a second spray nozzle and that defines the discharge angle of the chemical solution and the spray angles of the first spray nozzle and the second spray nozzle has already been proposed (see Patent Document 1).

  The nozzle device includes a nozzle main body, a first air main body, and a second air main body, and the first air main body and the second air main body are provided with through holes whose internal spaces are open to the outside air. (Refer to Patent Document 2). According to such a nozzle device, the first and second air bodies can be prevented from being clogged with solid matter.

JP 2008-18424 A JP 2008-290023 A

However, although the nozzle devices described in Patent Documents 1 and 2 described above can apply the chemical liquid to the traveling body against the accompanying flow, it can be said that the chemical liquid can be always applied with a high adhesion rate. Absent.
Moreover, in the nozzle device described in Patent Document 2, it can be said that solid matter based on the rolled up chemical solution can be prevented from adhering to the air nozzle over time, but it is not sufficient. That is, there is a drawback that the efficiency of air blowing gradually decreases.

  This invention is made | formed in view of the said situation, and it aims at providing the nozzle apparatus which can spray air efficiently and can provide a chemical | medical solution with a high adhesion rate to a traveling body.

  The inventors of the present invention have intensively studied to solve the above problems, and in the conventional nozzle device, when air is blown, even if the periphery of the air flow path becomes negative pressure and a through hole is provided ( It was found that a backflow of air occurred around the air flow path. Then, the present inventors have found that the reverse flow of air can be unexpectedly suppressed by providing the air nozzle port and the cross-sectional area in the flow path with a certain relationship without providing a through hole, and have completed the present invention.

The present invention is (1) a nozzle device for applying a chemical solution to a traveling body in a paper machine, wherein the nozzle body portion having a chemical solution nozzle port capable of discharging a chemical solution and the discharged chemical solution are sandwiched And an air main body part capable of blowing air from both sides of the nozzle main body part. The air main body part includes an air introduction channel through which air is introduced, and front and rear of the nozzle main body unit communicating with the air introduction channel. And a pair of air nozzle ports through which air is discharged to communicate with each of the circulation channels, and a cross-sectional area SA of the air introduction channel and a pair of air the ratio of the total cross-sectional area SB of the nozzle opening 1: consists in 5 / 28.3 to 13 / 28.3 der Ru nozzle device.

In the present invention, (2) the ratio of the cross-sectional area SA of the air introduction flow path to the minimum cross-sectional area ST of the flow flow path is 1: 5 / 28.3 to 18 / 28.3, and the flow flow path The relationship between the minimum cross-sectional area ST and the cross-sectional area SB of the air nozzle port is
ST ≧ SB
It exists in the nozzle apparatus of the said (1) description.

In the present invention, (3) the flow passage is provided with a large-diameter portion for storing air, and the cross-sectional area SA of the air introduction flow passage and the cross-sectional area SD of the large-diameter portion in the flow passage are ratio of 1: 85 / 28.3 to 120 / 28.3 der Ru (2) consists in a nozzle device according.

In the present invention, (4) an arm part is connected to both ends of the nozzle body part, a chemical liquid supply pipe for supplying a chemical liquid is connected to one arm part, and a chemical liquid is discharged to the other arm part. discharge air supply pipe for supplying air is connected, the air pressure of the air that flows through the discharge air supply pipe, one of 0.04~0.15MPa der Ru (1) to (3) It exists in the nozzle apparatus of description.

  In the present invention, (5) the chemical solution nozzle port and the pair of air nozzle ports are arranged along the traveling direction of the traveling body, the chemical solution nozzle port is circular, and the air nozzle port is slit-shaped. It exists in the nozzle apparatus as described in any one of said (1)-(4).

  This invention exists in the nozzle apparatus as described in any one of said (1)-(5) whose air pressure of the air introduce | transduced into an air introduction flow path is 0.02-0.3 MPa (6).

  In the present invention, (7) the traveling body is a paper body, a canvas, a dryer roll, a calender roll or a canvas roll, and the chemical liquid contains a wet paper strength agent, a cleaning agent, a pitch control agent, a contamination inhibitor or a release agent. It exists in the nozzle apparatus as described in any one of said (1)-(6).

  The present invention resides in (8) the nozzle device according to any one of (1) to (7), wherein a scanning unit is attached to the paper machine, and the scanning unit performs reciprocal scanning.

  In the nozzle device of the present invention, since the chemical solution is discharged from the chemical solution nozzle port and air is blown from the air nozzle ports on both sides of the chemical solution nozzle port, the scattering of the chemical solution due to the accompanying flow is suppressed. Therefore, according to the nozzle device, it is possible to reliably apply the chemical liquid to the traveling body.

In the nozzle device, the relationship between the cross-sectional area SA of the air introduction flow path and the cross-sectional area SB of the air nozzle port is
SA ≧ SB
By doing so, it becomes possible to spray from the entire nozzle nozzle for air while maintaining the momentum of air. As a result, the backflow of air is reliably prevented, and as a result, air can be efficiently blown and the chemical solution can be applied to the traveling body with a high adhesion rate.

In addition, the relationship among the cross-sectional area SA of the air introduction flow path, the minimum cross-sectional area ST in the circulation flow path, and the cross-sectional area SB of the air nozzle port is
SA ≧ ST ≧ SB
If it becomes, it can blow air more efficiently.

In the nozzle device of the present invention, when the large-diameter portion for accumulating air is provided in the flow passage, it is possible to apply the chemical solution to the traveling body with a higher adhesion rate. At this time, the relationship between the cross-sectional area SA of the air introduction channel, the minimum cross-sectional area ST in the flow channel, the cross-sectional area SD of the large diameter portion in the flow channel, and the cross-sectional area SB of the air nozzle port is
SD ≧ SA ≧ ST ≧ SB
It is more preferable that

  In the nozzle device of the present invention, when the air nozzle port is slit-shaped, air is blown into a curtain shape. At this time, if the chemical solution nozzle port is circular, the curtain-like air blown from the air nozzle port can sandwich the chemical solution discharged from the chemical solution nozzle port from both sides. For this reason, it becomes possible to give a chemical | medical solution to a traveling body with a higher adhesion rate.

  When the nozzle device of the present invention is reciprocally scanned by the scanning means, the chemical solution can be reliably applied to the traveling body even if the number of nozzle devices is one. If the number of nozzle devices is one, maintenance is easy and cost is advantageous.

FIG. 1A is a top view showing a nozzle device according to this embodiment, and FIG. 1B is a side view showing the nozzle device according to this embodiment. FIG. 2 is a schematic diagram illustrating a state in which chemical liquid and air are sprayed from the nozzle device according to the present embodiment to the traveling body. FIG. 3 is a cross-sectional view taken along line AA of the nozzle device shown in FIG. FIG. 4 is a cross-sectional view of the nozzle device shown in FIG. (A) of FIG. 5 is an explanatory diagram for explaining a state of blowing air when air flows from a flow path having a large cross-sectional area to a flow path having a small cross-sectional area as in the nozzle device of the present invention, (B) of FIG. 5 is explanatory drawing for demonstrating the blowing state of air when air distribute | circulates from the flow path with a small cross-sectional area to the flow path with a large cross-sectional area. FIG. 6 is a perspective view schematically showing an example in which the nozzle device according to the present embodiment is used in a paper machine. FIG. 7 is a perspective view schematically showing another example in which the nozzle device according to the present embodiment is used in a paper machine. FIG. 8 is a top view schematically showing another example in which the nozzle device according to the present embodiment is used in a paper machine. FIG. 9 is a diagram for explaining a method for testing the adhesion rate in Examples and Comparative Examples. FIG. 10 is a photograph of the nozzle body of the nozzle device of Example 3 in Evaluation 2. FIG. 11 is a photograph of the nozzle body of the nozzle device of Comparative Example 1 in Evaluation 2.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings as necessary. In the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. Further, the positional relationship such as up, down, left and right is based on the positional relationship shown in the drawings unless otherwise specified. Further, the dimensional ratios in the drawings are not limited to the illustrated ratios.

FIG. 1A is a top view showing a nozzle device according to this embodiment, and FIG. 1B is a side view showing the nozzle device according to this embodiment.
As shown in FIGS. 1A and 1B, a nozzle device 100 according to the present embodiment includes a nozzle main body 2 having a chemical solution nozzle port 1 capable of discharging a chemical solution, and a discharged chemical solution. An air main body 10 having an air nozzle port 12 through which air can be blown from both sides of the nozzle main body 2, and a tube connected to the air main body 10 for introducing air into the air introduction flow path. 7.

  In the nozzle device 100, since the chemical solution is discharged from the chemical solution nozzle port 1 and air is blown from the air nozzle ports 12 on both sides of the chemical solution nozzle port 1, scattering of the chemical solution due to the accompanying flow is suppressed. .

  Here, the chemical solution nozzle port 1 has a circular shape, and the air nozzle port 12 has a slit shape. Thereby, the sprayed air becomes a curtain shape, and the chemical solution discharged from the chemical solution nozzle port is sandwiched from both sides.

FIG. 2 is a schematic diagram illustrating a state in which chemical liquid and air are sprayed from the nozzle device according to the present embodiment to the traveling body.
As shown in FIG. 2, the nozzle device 100 is disposed at an acute angle with respect to the traveling direction of the traveling body 50 in order to suppress the scattering of the chemical solution due to the accompanying flow R. That is, the nozzle device 100 discharges the chemical liquid toward the downstream side of the traveling body 50.

  In the nozzle device 100, a chemical solution nozzle port 1 and a pair of air nozzle ports 12 are arranged in a line along the traveling direction P of the traveling body 50. That is, from the upstream side of the traveling body 50, an air nozzle port (hereinafter also referred to as “upstream air nozzle port”) 12a, a chemical solution nozzle port 1, and an air nozzle port (hereinafter referred to as “downstream” for convenience). Also referred to as “side air nozzle ports”.) 12b. The upstream air nozzle port 12a and the downstream air nozzle port 12b have the same structure.

In the nozzle device 100, the air A1 blown from the upstream air nozzle port 12a is blown to the upstream side of the chemical liquid Y (the accompanying flow R side generated based on the traveling of the traveling body 50), thereby causing the accompanying flow R. Block some of the.
Further, the air A2 blown from the downstream air nozzle port 12b is blown to the downstream side of the chemical liquid Y, thereby suppressing the chemical liquid Y from being rolled up by the accompanying flow R.
Thereby, even when the traveling body 50 travels at a high speed, the chemical liquid Y can be reliably applied to the traveling body 50 against the accompanying flow R.

Returning to FIGS. 1A and 1B, in the nozzle device 100, the nozzle main body 2 has a rectangular parallelepiped shape, and the chemical solution nozzle port 1 is provided at the approximate center of the upper surface.
The nozzle body 2 is connected to arms 5a and 5b for fixing the nozzle body 2 at both ends. A supply pipe for feeding a chemical solution to the nozzle body 2 and the chemical solution nozzle port 1 is provided inside the arm portions 5a and 5b. Such a supply pipe will be described later.

In the nozzle device 100, the air main body 10 has a U-shaped cross section and is attached from below the nozzle main body 2 so as to sandwich the nozzle main body 2. That is, the nozzle body 2 is detachable.
Further, by assembling the air main body portion 10 to the nozzle main body portion 2, an upstream air nozzle port 12a and a downstream air nozzle port 12b are formed, and air is supplied from the air introduction channel. As a result, air of the same strength is blown from the upstream air nozzle port 12a and the downstream air nozzle port 12b.

FIG. 3 is a cross-sectional view taken along line AA of the nozzle device shown in FIG.
As shown in FIG. 3, in the nozzle main body 2 of the nozzle device 100, a chemical liquid supply pipe 8a for supplying a chemical liquid to the nozzle main body 2 is connected to the arm 5a, and the chemical liquid is connected to the arm 5b. A discharge air supply pipe 8b for supplying air for discharging the gas is connected.
And the chemical | medical solution flow path Ta is formed in the inside of the arm part 5a, and the discharge air flow path Tb is formed in the inside of the arm part 5b.

In the nozzle device 100, the chemical solution supplied from the chemical solution supply pipe 8a flows through the inside of the chemical solution supply pipe 8a, and is sent to the chemical solution channel Ta communicating with the chemical solution supply pipe 8a. And a chemical | medical solution is sent to the nozzle main-body part 2 from the chemical | medical solution flow path Ta.
On the other hand, the air supplied from the discharge air supply pipe 8b flows through the inside of the discharge air supply pipe 8b and is sent to the discharge air flow path Tb communicating with the discharge air supply pipe 8b. And air is sent to the nozzle main-body part 2 from the discharge air flow path Tb.

  And the mixture with which the chemical | medical solution and air which were sent to the nozzle main-body part 2 were mixed is discharged from the nozzle port 1 for chemical | medical solutions. In other words, in the nozzle device 100, the chemical liquid is discharged together with the air by supplying the chemical liquid to the chemical liquid nozzle port 1 and simultaneously supplying air. At this time, the discharged chemical is accelerated by the momentum of the discharged air.

FIG. 4 is a cross-sectional view of the nozzle device shown in FIG.
As shown in FIG. 4, in the nozzle device 100, the air main body portion 10 includes an air introduction passage 13 through which air is introduced, a pair of front and rear flow passages 14 communicating with the air introduction passage 13, and the circulation. And a pair of air nozzle ports 12 through which air is discharged.
The circulation channel 14 includes a large-diameter portion 14a that bends and communicates with the air introduction channel 13, and a small-diameter portion 14b that bends and communicates with the large-diameter portion 14a. The small-diameter portion 14b has a minimum cross-sectional area in the circulation channel 14.

In the nozzle device 100, air is introduced from the tube 7 into the air introduction channel 13.
The introduced air is branched into an upstream side and a downstream side inside the air main body portion 10 and passes through the large diameter portion 14a and the small diameter portion 14b, and passes from the air nozzle port 12 to the traveling body. Will be sprayed.

In the nozzle device 100, the relationship between the cross-sectional area SA of the air introduction flow path 13 and the cross-sectional area SB of the air nozzle port 12 is
SA ≧ SB
It has become. For this reason, in the nozzle device 100, the air pressure is not attenuated, and it is possible to spray from the entire air nozzle port 12 while maintaining the air pressure in the air introduction flow path 13.
As a result, there is no negative pressure around the air flow path, so that the backflow of air is reliably prevented. As a result, air can be efficiently blown and the chemical solution Y is highly applied to the traveling body 50. It becomes possible to give by the adhesion rate.

Further, the relationship between the cross-sectional area SA of the air introduction flow path 13, the minimum cross-sectional area (cross-sectional area of the small diameter portion 14 b) ST in the circulation flow path 14, and the cross-sectional area SB of the air nozzle port 12 is
SA ≧ ST ≧ SB
It is preferable that In this case, since the momentum of air is not suppressed, it becomes possible to blow air more efficiently.

Here, in the nozzle device 100, since the flow passage 14 includes the large diameter portion 14a, air can be sufficiently accumulated. If it does so, the quantity of the discharged air will increase and it will become possible to provide a chemical | medical solution with a higher adhesion rate to a traveling body.
At this time, the cross-sectional area SA of the air introduction flow path 13, the minimum cross-sectional area ST in the flow path 14, the cross-sectional area SD of the large diameter portion 14 a in the flow path 14, and the cross-sectional area SB of the air nozzle port 12. The relationship with
SD ≧ SA ≧ ST ≧ SB
It is more preferable that
That is, in the nozzle device 100, it is preferable that the cross-sectional area of the entire air flow path is reduced toward the downstream side, and the large diameter portion 14a is provided only in the circulation flow path 14.

Here, a description will be given of a mechanism in which a negative pressure is generated around the air flow path when air flows from a flow path having a large cross-sectional area to a flow path having a small cross-sectional area.
(A) of FIG. 5 is an explanatory diagram for explaining a state of blowing air when air flows from a flow path having a large cross-sectional area to a flow path having a small cross-sectional area as in the nozzle device of the present invention, (B) is explanatory drawing for demonstrating the blowing state of air when air distribute | circulates from the flow path with small cross-sectional area to the flow path with large cross-sectional area.
As shown in FIG. 5B, when air flows from a channel having a small cross-sectional area to a channel having a large cross-sectional area, no air pressure is applied around the air flow channel, and conversely By virtue of the venturi effect, a negative pressure is generated around the air flow path. As a result, air flows backward around the air flow path, and for example, solids based on the rolled up chemical solution adhere to the air nozzle over time.

  On the other hand, as shown in FIG. 5 (a), when air flows from a flow path having a large cross-sectional area to a flow path having a small cross-sectional area, the air travels throughout the flow path. There is no negative pressure around the traveling channel. For this reason, the backflow of air is reliably prevented. As a result, in the nozzle device 100, air can be efficiently blown and the chemical Y can be applied to the traveling body 50 with a high adhesion rate.

  In the nozzle device 100 according to this embodiment, the air pressure of the air flowing through the discharge air supply pipe 8b is preferably 0.04 to 0.15 MPa. In this case, the chemical liquid can be efficiently and reliably discharged.

Moreover, it is preferable that the air pressure of the air introduce | transduced into the air introduction flow path 13 is 0.02-0.3 MPa.
When the air pressure introduced into the air introduction flow path 13 is less than 0.02 MPa, the accompanying flow can be sufficiently blocked as compared with the case where the air pressure introduced into the air introduction flow path 13 is within the above range. Therefore, the rolled up chemical cannot be pressed down sufficiently.
On the other hand, when the air pressure introduced into the air introduction flow path 13 exceeds 0.3 MPa, the blown air itself is disturbed compared to the case where the air pressure introduced into the air introduction flow path 13 is within the above range. It tends to hinder the adhesion of the chemical solution to the traveling body 50.

  In the nozzle device 100, the distance from the tip of the chemical solution nozzle port 1 to the intersection of the discharge direction of the chemical solution Y and the traveling body 50 is preferably 30 to 120 mm. In this case, even in an ultra-high speed paper machine, the chemical solution can be reliably applied to the traveling body 50, and the scattering of the chemical solution can be sufficiently suppressed.

The nozzle device 100 according to the present embodiment is used to apply the chemical Y to the traveling body 50 in the paper machine.
Examples of the traveling body 50 include a paper body, a wire, a felt, a canvas, a dryer roll, a calendar roll, or a canvas roll.
Among these, the nozzle device 100 is preferably used for a paper body, a canvas, a dryer roll, a calendar roll, or a canvas roll. In general, paper bodies, canvases, dryer rolls, calendar rolls or canvas rolls in a paper machine run at a high speed and easily cause dirt, pitch, paper fraying, and the like, so that these can be effectively prevented.

Examples of the chemical liquid Y include a wet paper strength agent, a cleaning agent, a pitch control agent, a contamination inhibitor, and a release agent.
Since the nozzle device 100 can reliably apply the chemical Y to the traveling body 50, the traveling body 50 to which the chemical Y has been applied can reliably exhibit the function based on the applied chemical Y.

  In addition, it is preferable that the viscosity of the chemical | medical solution Y is 500 cps or less, and it is more preferable that it is 1-200 cps. In this case, the chemical liquid Y can be reliably applied to the traveling body 50, and scattering of the chemical liquid can be sufficiently suppressed.

  In the nozzle device 100 according to the present embodiment, the chemical liquid Y and air are supplied from a pump unit (not shown). The cross-sectional area of the pipe supplied with air from the pump unit is preferably equal to or larger than the cross-sectional area SC of the tube 7.

Next, the chemical | medical solution provision method using the nozzle apparatus 100 which concerns on this embodiment is demonstrated.
FIG. 6 is a perspective view schematically showing an example in which the nozzle device according to the present embodiment is used in a paper machine.
As shown in FIG. 6, the paper machine 101 includes a rotatable drum 45, and a traveling body 50 is disposed on the drum 45. The traveling body 50 travels in the traveling direction P based on the rotation of the drum 45.

  In the paper machine 101, a scanning unit 30 is attached above the drum 45. A driving device 43 that reciprocally scans in the length direction of the scanning unit 30 is attached to the scanning unit 30, and the nozzle device 100 can discharge a chemical solution toward the traveling body 50 in the driving unit 43. It is attached as follows. At this time, the nozzle device 100 is attached by adjusting the angle between the traveling direction P of the traveling body 50 and the ejection direction of the chemical liquid Y so that the discharged chemical Y is sufficiently applied to the traveling body 50. .

Then, while the traveling body 50 is traveling in the traveling direction P, the nozzle device 100 is reciprocally scanned together with the driving device 43, and the chemical solution is discharged from the nozzle device 100 toward the traveling body 50, thereby causing the traveling body 50 to be liquid chemical. Y is given.
At this time, the chemical solution is applied from the chemical solution nozzle port 1 of the nozzle device 100 and air is blown from the air nozzle port 12.

In the chemical solution application method, since the nozzle device 100 is used, the air nozzle port 12 can be prevented from being clogged with solid matter.
Further, since the chemical solution Y is applied from the chemical solution nozzle port 1 and air is simultaneously blown from the air nozzle port 12, the chemical solution Y is reliably applied to the traveling body 50 even in the ultra-high speed paper machine 101. In addition, the scattering of the chemical Y can be sufficiently suppressed.

  In addition, since the above-described chemical solution application method includes the scanning unit 30 attached to the paper machine 101 and the nozzle device 100 is reciprocated by the scanning unit 30, the number of nozzle devices 100 can be ensured. The chemical liquid Y can be applied to the traveling body 50. When the number of nozzle devices 100 is one, maintenance is easy and cost is advantageous.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment.

  In the nozzle device 100 in the present embodiment, the chemical solution nozzle port 1 has a circular shape, but may have a slit shape, a ring shape, or the like.

  In the nozzle device 100 according to the present embodiment, the chemical solution nozzle ports 1 and the air nozzle ports 12 are arranged in a line with respect to the traveling direction P, but are not necessarily in a line.

  In the nozzle device 100 according to the present embodiment, the nozzle main body 2 and the air main body 10 are separate, but may be integrated.

  The nozzle device 100 according to the present embodiment can be used for food processing, fiber processing, and the like in addition to a paper machine.

  In the example in which the nozzle device 100 according to the present embodiment described above is used for the paper machine 101, one nozzle device 100 is attached to the paper machine 101. However, even if a plurality of nozzle devices 100 are attached to the paper machine, Good.

FIG. 7 is a perspective view schematically showing another example in which the nozzle device according to the present embodiment is used in a paper machine.
As shown in FIG. 7, in the paper machine, a plurality of driving devices 43 for reciprocating scanning in the length direction of the scanning means 30 are attached to the scanning means 30, and the nozzle device 100 is attached to each driving device 43. You may attach so that a chemical | medical solution may be discharged toward the traveling body 50. FIG.

FIG. 8 is a top view schematically showing another example in which the nozzle device according to the present embodiment is used in a paper machine.
As shown in FIG. 8, a plurality of nozzle devices 100 may be attached to a predetermined main body 70. That is, when this is used in a paper machine, the chemical solution is simultaneously discharged from the plurality of nozzle devices 100 attached to the main body 70, so that the reciprocating scanning of the nozzle device 100 is unnecessary.
The main body 70 includes a tube, a chemical solution supply pipe, and a discharge air supply pipe (not shown). Further, a traveling body (not shown) travels in the traveling direction P (traveling direction).

  Hereinafter, examples using the nozzle device of the present invention will be described in detail, but the present invention is not limited thereto.

(Examples 1 to 10 and Comparative Example 1)
Table 1 shows the cross-sectional area SA of the air introduction flow path shown in FIG. 4, the cross-sectional area SD of the large diameter portion of the flow path, the cross-sectional area ST of the small diameter portion of the flow path, and the cross-sectional area SB of the air nozzle port. A nozzle device adjusted to the value shown in FIG. In Examples 8 to 10, the cross-sectional area of the large-diameter portion is smaller than the cross-sectional area of the small-diameter portion. That is, the large diameter portion functions as the small diameter portion, and the small diameter portion functions as the large diameter portion.

(Table 1)

(Evaluation 1)
As shown in FIG. 9, the nozzle devices obtained in Examples 1 to 10 and Comparative Example 1 are arranged facing downward so that the air nozzle port has a predetermined angle θ, and the spraying distance L from the nozzle device is set. Is placed below the SUS plate 81 and below the SUS plate 81 so that the distance becomes 10 cm.
Then, Duscreen R409S (release agent, viscosity: 3 cps, manufactured by Mentec Co., Ltd.) is used as the chemical solution, and 3.0 m / s of wind is blown from the side instead of the accompanying flow R, and the discharge air supply pipe 8b is circulated. The chemical solution was sprayed for 1 minute so that the air pressure of air was 0.1 MPa, and at the same time, air was sprayed for 1 minute so that the air pressure of air was 0.3 MPa.
From the amount of the chemical liquid attached to the SUS plate 81 and the amount of the discharged chemical liquid, the adhesion rate (the amount of the chemical liquid attached to the SUS plate 81 × 100 / the amount of the discharged chemical liquid) was measured.
The obtained results are shown in Table 2.

(Table 2)

From the results of Table 2, it is confirmed that Examples 1 to 10 using the nozzle device according to the present invention can adhere the chemical liquid to the traveling body with a sufficiently high adhesion rate as compared with Comparative Example 1 not according to the present invention. It was done. In particular,
SD ≧ SA ≧ ST ≧ SB
Examples 1, 2, 3, and 8 satisfying the requirements showed extremely excellent adhesion rates.

(Evaluation 2)
Using the nozzle device of Example 3 and Comparative Example 1, using Duscreen R409S (release agent, viscosity 3 cps, manufactured by Mentec Co., Ltd.) as the chemical solution, instead of the accompanying flow R, a side of 3.0 m / s wind The chemical solution is sprayed for 2 weeks so that the air pressure of the air flowing through the discharge air supply pipe 8b is 0.1 MPa, and at the same time, air is blown for 2 weeks so that the air pressure of air is 0.3 MPa. It was.
A photograph of the nozzle device after two weeks is shown in FIGS. FIG. 10 is a photograph of the nozzle body of the nozzle device of Example 3 in Evaluation 2. FIG. 11 is a photograph of the nozzle body of the nozzle device of Comparative Example 1 in Evaluation 2.

  From FIG.10 and FIG.11, since Example 3 using the nozzle apparatus which concerns on this invention has less adhesion of the solid substance to a nozzle main body part compared with the comparative example 1 which is not based on this invention, it is air. It can be said that the blowing force is remarkably improved and air can be efficiently blown.

  From the above results, according to the nozzle device of the present invention, it was confirmed that air can be efficiently blown and a chemical solution can be applied to the traveling body with a high adhesion rate.

  The No. 72 slur apparatus of the present invention is suitably used as an apparatus for applying a chemical to a traveling body in a paper machine. According to the nozzle device of the present invention, air can be efficiently blown and a chemical solution can be applied to the traveling body with a high adhesion rate.

DESCRIPTION OF SYMBOLS 1 ... Nozzle port for chemical | medical solutions 2 ... Nozzle main-body part 5a, 5b ... Arm part 7 ... Tube 8a ... Chemical-solution supply pipe 8b ... Discharge air supply pipe 10 ... Air main-body part 12 ... Nozzle port for air 12a ... Nozzle port for upstream air (nozzle port for air)
12b: Nozzle port for downstream air (nozzle port for air)
DESCRIPTION OF SYMBOLS 13 ... Air introduction flow path 14 ... Distribution flow path 14a ... Large diameter part 14b ... Small diameter part 30 ... Scanning means 43 ... Drive device 45 ... Drum 50 ... Traveling body 70 ... Main body 80 ... Scale 81 ... SUS plate 100 ... Nozzle device 101 ... Paper machine A1, A2 ... Air L ... Spreading distance P ... Running direction R・ ・ ・ Sequential flow SD ・ ・ ・ Cross sectional area of large diameter part ST ・ ・ ・ Cross sectional area of small diameter part SA ・ ・ ・ Cross sectional area of air introduction channel SB ・ ・ ・ Cross sectional area of nozzle port for air SC ・ ・・ Cross-sectional area of tube Ta ... chemical liquid flow path Tb ... discharge air flow path Y ... chemical liquid

Claims (8)

A nozzle device for applying a chemical to a traveling body in a paper machine,
A nozzle body having a chemical liquid nozzle port capable of discharging the chemical liquid;
An air main body part capable of blowing air from both sides of the nozzle main body part so as to sandwich the discharged chemical liquid;
With
The air body portion communicates with an air introduction passage through which air is introduced, a pair of circulation channels provided before and after the nozzle body portion communicating with the air introduction passage, and the circulation channels, respectively. A pair of air nozzle ports through which air is discharged,
The sectional area SA of the air introduction flow path, the ratio of the total cross-sectional area SB of the pair of air nozzle port 1: 5 / 28.3 to 13 / 28.3 der Ru nozzle device. The ratio of the cross-sectional area SA of the air introduction channel to the minimum cross-sectional area ST of the circulation channel is 1: 5 / 28.3 to 18 / 28.3, and the minimum break in the circulation channel is The relationship between the area ST and the cross-sectional area SB of the air nozzle port is as follows:
ST ≧ SB
The nozzle device according to claim 1. The flow passage is provided with a large diameter portion for storing air ,
Sectional area SA of the air introduction flow path, wherein the ratio of the cross-sectional area SD of the large diameter portion of the flow conduit is one eighty-five / 28.3 to 120 / 28.3 nozzles Der Ru claim 2, wherein apparatus.   Arms are connected to both ends of the nozzle body,
  One arm is connected to a chemical supply pipe for supplying chemical,
  A discharge air supply pipe for supplying air for discharging the chemical solution is connected to the other arm part,
  The nozzle device according to any one of claims 1 to 3, wherein an air pressure of air flowing through the discharge air supply pipe is 0.04 to 0.15 MPa. The chemical solution nozzle port and the pair of air nozzle ports are arranged along the traveling direction of the traveling body,
The nozzle device according to any one of claims 1 to 4, wherein the chemical solution nozzle port has a circular shape and the air nozzle port has a slit shape.   The nozzle device according to any one of claims 1 to 5, wherein an air pressure of air introduced into the air introduction channel is 0.02 to 0.3 MPa. The traveling body is a paper body, a canvas, a dryer roll, a calendar roll or a canvas roll,
The nozzle device according to any one of claims 1 to 6, wherein the chemical liquid includes a wet paper strength agent, a cleaning agent, a pitch control agent, a contamination inhibitor, or a release agent. The paper machine is equipped with scanning means,
The nozzle device according to claim 1, which is reciprocally scanned by the scanning unit.

Images