JP3033077B2 - Head box for paper machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In a paper machine head box, a pulp raw material is uniformly distributed in the width direction of a paper machine by a raw material distribution device, and the raw material is diffused. is there.

In the prior art, in order to supplement the distribution and diffusion of pulp raw material by the raw material distribution device, a stationary (non-rotating) fixed or rotationally driven perforated roll is arranged between the raw material distribution device and the slice. A diamond-shaped current suppressing element is arranged in a slice (Japanese Patent Application Laid-Open No. 58-23983).

[0004]

However, the prior art has the following problems. The perforated roll allows the stock to flow from the front to the back with respect to the flow, and it is not expected to generate turbulence due to the generation of vortices on the back side.

[0005] The rhombus-shaped flow restricting element forms a streamline with respect to the flow of the stock, and it is not expected that turbulence is generated around the element due to the generation of vortices.

[0006] Since both the perforated roll and the rhombus-shaped flow control element are used while being stopped and arranged in a slice,
The orientation of the stock fibers provided by them is unique and cannot be adjusted.

[0007] The present invention provides a paper machine head box that generates an appropriate turbulence in the stock.
An object of the present invention is to make it possible to adjust the orientation of stock fibers and improve formation.

[0008]

According to the first aspect of the present invention, there is provided a head box for a paper machine for feeding a stock at a uniform flow rate from an opening of a slice in a corrugated surface in which peaks and valleys are repeated in an axial direction. Along the width direction of the slice perpendicular to the flow direction of the stock in the slice.
Place manner, is obtained by the so as to reciprocate the stock spreading bar in the width direction of the slice.

According to a second aspect of the present invention, in the first aspect, the stock diffusion bar is supported in a slice so as to be able to vibrate in the stock flow. .

According to a third aspect of the present invention, in the first or second aspect of the present invention, a plurality of stock diffusion bars are further arranged at a plurality of positions along the stock flow direction, respectively. When the bar is reciprocated in the width direction of the slice, the reciprocating motion of each of the stock diffusion bars is set so that the peaks and valleys of the adjacent stock diffusion bars are arranged correspondingly on the same line along the stock flow direction. They are synchronized with each other.

[0011]

According to the first aspect of the present invention, the following operations are provided. Since the stock diffusion bar has a corrugated surface and is orthogonal to the stock flow direction, a large vortex is generated on the back side of the stock flow with respect to the stock flow, and an appropriate turbulence is applied to the stock by the eddy current effect. Can be generated.

Since the stock diffusion bar is reciprocated in the width direction of the slice, the orientation of the stock fiber can be easily adjusted by adjusting the amount and speed of movement of the reciprocating corrugated surface.
It can be easily adjusted over the entire area in the width direction within the slice . Thereby, the aspect ratio of the product paper can be appropriately set.

According to the second aspect of the present invention, the following operations are provided. The stock diffusion bar is allowed to vibrate in the flow. This vibration effect (vibration effect), vinegar
An appropriate turbulence can be generated by the stock throughout the width of the rice .

According to the third aspect of the present invention, the following operations are provided. The peaks and valleys of adjacent stock diffusion bars are arranged correspondingly on the same line along the stock flow direction. Therefore, when passing sequentially around the bar, the stock is diffused when passing around the mountain and converged when passing around the valley. That is, the stock is alternately given diffusion and convergence to generate an appropriate turbulence.

[0015]

FIG. 1 is a schematic view showing an example of a head box for a paper machine, FIG. 2 is a plan view showing a stock diffusion bar in a slice, and FIG. 3 is a cross section taken along line III-III in FIG. FIG.

The head box 10 is constructed as shown in FIG. 1. The pulp raw material passes through a taper header 11, a manifold step 12 (raw material distribution device), a slice 13, and a slice outlet 15 whose opening is adjustable by a profile lip 14. Through the forming wire.

The head box 10 has first to third stock diffusion bars 16, 17, and 18 at three positions in the slice 13 along the stock flow direction. Each bar 1
6, 17, 18 have a corrugated surface in which peaks a and valleys b are repeated in the axial direction, are arranged orthogonally to the stock flow direction in the slice 13, and both ends are supported by the side plate 10A of the head box 10. .

Each of the stock diffusion bars 16, 17, 18 is connected to a sliding device 20 so as to be able to reciprocate in the axial direction. When the bars 16, 17, and 18 are reciprocated in the axial direction, the peaks a of the adjacent bars 16, 17 are set.
And the valley b, and the ridges a and valleys b of the adjacent bars 17 and 18 are arranged on the same line (for example, L in FIG. 2) along the flow direction of the stock so as to correspond to each bar by the sliding device 20. The reciprocation of 16, 17, 18 is synchronized with each other.

The diameter of each of the stock diffusion bars 16, 17, and 18 is gradually reduced as the slice 13 gradually decreases its channel height in the stock flow direction.

Further, each of the stock diffusion bars 16, 17, and 18 is provided with a clearance between the support holes of the side plate 10A, and a vibration generator 30 such as a vibrator is provided at the shaft end thereof. 16, 17, 18 are supported so that they can vibrate in the stock stream.

The sliding device 20 may be of a fluid type such as pneumatic, hydraulic or hydraulic, an eccentric cam type, a gear type, a crank arm rotating type or the like. The amount and speed of movement of each of the bars 16, 17, 18 by the sliding device 20 can be adjusted arbitrarily.

The operation of this embodiment will be described below. Since the stock diffusion bars 16, 17, and 18 are corrugated and intersect with the stock flow direction, a large vortex is generated on the back side of the stock flow with respect to the stock flow, and the stock effect is caused by the vortex effect. The appropriate turbulence can be generated.

The stock diffusion bars 16, 17, and 18 are reciprocated in the axial direction, so that the orientation of the stock fibers can be adjusted by adjusting the amount and speed of movement of the reciprocating corrugated surface. Thereby, the aspect ratio of the product paper can be appropriately set.

The stock diffusion bars 16, 17, 18 are allowed to vibrate in the flow. By this vibration action (vibration effect), appropriate turbulence can be generated in the stock.

Adjacent stock diffusion bars 16, 17, 18
Are arranged correspondingly on the same line along the stock flow direction. Therefore, the stock is sequentially diffused when passing around the bar after passing around the bar, and converged when passing around the valley b. That is,
The stock is alternately given diffusion and convergence to generate the appropriate turbulence.

In the practice of the present invention, the bar is made free to move, for example, by supporting the stock diffusion bar with a clearance provided between the stock box and the support hole of the head box side plate. It is good also as what makes it vibrate with.

In the practice of the present invention, the stock diffusion bar may have only one bar. The cross-sectional shape of the stock diffusion bar may be any of a circle, a square, and the like.

[0028]

As described above, according to the present invention, in a head box for a paper machine, an appropriate turbulence is generated in the stock and the orientation of the stock fiber can be adjusted to improve the formation. be able to.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an example of a head box for a paper machine.

FIG. 2 is a plan view showing a stock diffusion bar in a slice.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

[Explanation of symbols]

 Reference Signs List 10 head box 13 slice 16, 17, 18 stock diffusion bar 20 sliding device 30 vibration generator

Claims (3)

(57) [Claims] 1. A head box for a paper machine for feeding stock at a uniform flow rate from an opening of a slice, wherein a stock diffusion bar having a corrugated surface in which peaks and valleys are repeated in an axial direction is provided. The slurry perpendicular to the flow direction
A head box for a paper machine, wherein the head box is arranged along the width direction of the chair, and the stock diffusion bar can reciprocate in the width direction of the slice . 2. A head box for a paper machine according to claim 1, wherein said stock diffusion bar is supported in a slice so as to be able to vibrate in the stock flow. 3. A plurality of stock diffusion bars are arranged at each of a plurality of positions along the stock flow direction, and when each stock diffusion bar is reciprocated in the width direction of a slice, a peak of adjacent stock diffusion bars is used. 3. The head box for a paper machine according to claim 1, wherein the reciprocating motions of the stock diffusion bars are synchronized with each other so that the valleys and the valleys are arranged correspondingly on the same line along the stock flow direction.