JPS6028596A - Slice of headbox - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a headbox slice that is capable of actively agitating the raw material (stock) discharged from the headbox of a paper machine to achieve sufficient fiber dispersion. .

As shown in FIG. 1, there is a conventional head box slicing device in which the raw material is ejected through a plurality of tubes a to disperse the fibers.

In this type, the raw material is only disturbed by diffusion from tube a. Sufficient disturbance is difficult.

If the diameter of the duplex a is large, the disturbance effect will be small, and if the diameter of the duplex a is made small, the disturbance effect will be large. Therefore, it is desirable to make the diameter of the duplex a small, but this has the disadvantage of causing blockage.

Conventionally, as shown in Fig. 2, a plurality of partition walls (sheets) 1+ are inserted over the entire length of the slice, and the flocs are destroyed by the wall shear force J in the flow velocity distribution. Things are being thought of.

However, in this method, the fibers naturally gather inside, as in a general rotational viscometer, resulting in a state where the fibers do not come into close contact with the partition wall surface. It becomes 11. In other words, the wall surface and the fibers do not come into close contact with each other, and a lubricating layer of water is created between them, and a tJJl17i force is generated where there are few fibers (section 0 in Figure 3), and the shearing force is weak where there are flocs. There is a problem that 111J14Ii slips on the wall surface that generates shearing noise, causing the flocs to break. In particular, if the raw material'I5 degree becomes 8 degrees, the effect of disturbing the 15'' cannot be sustained at all.

The present invention was made with the aim of enabling sufficient fiber dispersion even when the raw material r4Z1 degree in the head box is at a high concentration. The raw material flow on the upper side and the raw stone flowing on the lower side are made to intersect with A≧, and the shearing force at this time is broken. Examples will be described with reference to the drawings.

4 to 8 show an embodiment in which a slice of the present invention is divided into two parts in the thickness direction, with an upper partition plate 1 having a height half the height of the gap S in the downward direction t of the slice, and a lower Partition plate 2
How do you prepare multiple sheets, and each bottom partition IN2 is flat to the top of the slice? The upper partition plates 1 are arranged in such a way that they are erected in the direction of the slice and are inclined at a predetermined angle with respect to the longitudinal direction of the slice I and come into contact with the slice side wall. The upper partition plates 2 are arranged parallel to each other so as to extend in the opposite direction to the inclination direction of the lower partition plates 2 so as to intersect with each other. Form a flow path. Also, G5 (
The ends of the upper and lower partition plates 1 and 2 that are brought into contact with the side edges of the slices are placed at the same position as shown in the figure, and the ends of the upper and lower partition plates 1 and 2 are placed in the same position in front and behind the intersection between the lower and lower partition plates 1 and 2. On the side, there is a rectifying section with partition plates 3.4 that extend parallel to the flow and are arranged in multiple rows in the width direction of the slice (), and the raw ore passes through the rectifying section and is split vertically at the intersection to flow. After the fibers are dispersed by the shearing force generated at the intersection of the flow paths, the fibers are rectified and ejected at the flow straightening section on the exit side.

Since the above-mentioned (14 components) are used, the raw material flow ejected from the head box passes through the rectifying section at the partition plate 3, J, and then crosses at the upper and lower partition plates 1, 2. The raw material flowing upstream and the rough stone flowing below are separated at the intersection where the flow path is arranged. Since a plurality of lower or upper flow channels are connected to the side flow channel, for example, the raw material flow flowing into the upper flow ′δ is
Some of it flows into the lower 2At channel, but most of it flows along the upper channel, and during this time it comes into contact with another 100000000000000000000000 flow flowing through the lower channel, creating a strong shearing force. This allows the flocs to be broken and the fibers to be dispersed. Rinawara,
As shown in FIG. 7, in one space 5 where the upper partition plate 1 and the lower partition plate 2 intersect, 1jjt, 13 passing through the upper side
The flow A of 1 and the flow B of the raw material passing through the lower side intersect, and the flow i11! Due to the characteristic that the flow passing through I is a separate flow, the shearing force of both the upper and lower fluids can destroy the 1''.
, 2 occur in each space 5 where they intersect.

For example, while the 15 stone flow that has entered from the rectifying section to the upper side) A≧ is flowing as shown by the solid arrow A in Fig. 4, it flows into each of the lower flow channels and the raw material flow is By flowing as shown by the broken line arrow B, in the process of flowing through one upper flow channel, another flow flowing through a different lower flow channel and the space 5
The raw material flow flowing through one channel on the upper side is
The shearing force generated when the flow is close to the deviation from another flow flowing below one after another causes the flocs to become one piece. As a result, the raw material is effectively agitated (fibers can be effectively dispersed).This relationship is also the same for the raw material flow flowing through the lower side.

To explain specifically, as shown in Fig. 9, the flow of raw material through the upper flow path V+, the flow of raw material through the lower flow path■
2 intersects at the angle j garden of θ, then at the boundary, IV,
If l = IV21 = lVI, 1Jv = 2v
5in-! 2-) 41JJ vs. speed difference U, upper side Te L & v, x, V + V, lower side v2 x, V2
An action occurs in the direction of V, and based on this,'<9'J
EJli horns occur.

In the case of θ - 60 degrees, Av = v, O = 9 (1 degree is Av = F2v. This action occurs at all the lifting stations where the partition plates intersect, so the shear required to destroy the flocs is It can be freely designed to correspond to the strength of the force and the duration +15 darkness.In the conventional method, which starts from 1-U, you have to do many steps, but in this point, the present invention Now it can be much easier.

In the slicing of the present invention, as shown in FIGS. 4 and 8, after colliding with the side wall surface of the slice, a part of the raw material flow is forcibly redirected downward or upward, thereby stirring and mixing the flow. It is effective in destroying flocs and dispersing fibers. For example, if we look at the raw material flowing through the upper channel, when the raw material flows through one channel as shown by the solid arrow A, the flow channel ↓ will hit the side wall of the slice. After colliding with the side wall of the slice, the raw material passes through a slightly smaller part of the Ifli surface ram and is forced to flow into the lower channel, as shown by the broken line arrow B. will be washed away. In this way, the raw material flowing through the upper channel collides with the slice side wall surface and passes through a part with a slightly smaller cross-sectional area when pushed into the lower channel. There is also an effect when squirting, and the old one? As the t 131 flow changes direction,
Raw materials can be effectively stirred and mixed, and all raw materials can be dispersed. The raw material flow flowing through the lower flow path and hitting the slice side wall surface is similarly changed direction to flow through the upper flow path.

Next, FIG. 10 shows another embodiment of the present invention, in which upper and lower partition plates 1 and 2 are arranged in a zigzag pattern. That is, the upper partition plate 1 is bent in a zigzag manner in the longitudinal direction.
When the slices are arranged in parallel at regular intervals in the slice width direction, the lower partition plate 2, which is similarly bent in a zigzag shape and arranged in parallel, is shifted in the longitudinal direction from the upper partition plate 1. The upper and lower raw material streams flow in a zigzag pattern, and during this time, the upper and lower raw material streams come into contact with each other at the intersection of the upper and lower partition plates, generating shearing force that can destroy the flocs. .

Although the example in FIG. 4 shows the case where the upper partition plate 1 and the lower partition plate 2 are located at the same position on the slice side wall surface, the present invention is not limited to this. Please note that the number of upper and lower partition plates that are used side by side in the width direction of the slice is not limited to the number shown in the illustration, and that the slice is divided into two vertically (thickness direction) using partition plates 1 and 2 as an example. However, even if the slice thickness direction is divided into multiple parts with partition plates of 2 navy blue or more, the current plate 3
．． It goes without saying that 4 does not necessarily have to be a stage (), and that various other changes can be made without departing from the gist of the present invention.

As described above, according to the slicing of the present invention, wall shearing force that is difficult to realize is not expected, so the effect is reliable, and the raw material flowing above or below is displaced from other flows by 3t many times on the way. Because of the close contact, shearing force is generated between the traces of the raw material flow, which can destroy the vines and ensure the dispersion of the tJ & navy blue. In addition, the diagonal or bending angle of the partition plate can be selected arbitrarily, and the crossing angle can be made small to create a disturbance.
Song can be increased, etc., the shear force is strong, the duration υ′
It is possible to arbitrarily select the distance between f and create a slice that can destroy flocks of any bonding strength.Furthermore, since the effect is large, it can be made small, simple in structure, and inexpensive to manufacture. It has excellent effects such as:

[Brief explanation of the drawing]

1 to 3 are illustrations of the conventional side, FIG. 4 is a schematic plan view showing an example of the slice of the present invention, and FIG. 5 is a diagram showing the relationship between the upper and lower partition plates of the slice of the present invention. An explanatory diagram showing,
FIG. 6 is a perspective view showing an example of the arrangement of the upper and lower partition plates;
7 and 8 are partial plan views of FIG. 4, FIG. 9 shows the flow state at the intersection of the upper and lower raw materials, FIG. 1, and FIG. 10 are other examples of the slice of the present invention. 71-fJ is a schematic plan view. 1... Upper partition plate, 2... Lower partition plate, 3.4...
- Partition plate, 5...Space, A...Arrow indicating the flow of raw materials on the upper side, B...Arrow indicating the flow of raw materials on the lower side.

Claims (1)

[Claims] 1) Separate at least the upper half and lower half of the slice with a plurality of partition plates arranged in the slice width direction, and the lower partition plate and the lower partition plate each intersect by 1° at each division boundary surface.J: Sea urchin A slice of a headbox made up of an upper partition plate and a lower partition plate.