JP3386799B1 - Slit screen and manufacturing method thereof - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To effectively and efficiently select a fiber raw material liquid having excellent strength. SOLUTION: A vertically elongated member 1 having a cross-sectional shape whose width dimension gradually decreases from a wide portion 5 and reaches to a locking portion 8 wider than the narrow neck portion 7 through a narrow neck portion 7 is connected to each adjacent wide portion. Part 5
A plurality of the vertically long members 1 are held in the holding recesses 11 of the holding members 2 arranged at predetermined intervals along the longitudinal direction of the plurality of vertically long members 1 while forming a predetermined gap dimension therebetween. . The lengthwise member 1 has at least two different lengths from the wide portion 5 to the narrow neck portion 7 between adjacently arranged members.
Configure by type. The holding recesses 11 are formed in the holding member 2 so that the locking portions 8 can be held in a state where the wide portions 5 of the vertically long members 1 are aligned with a predetermined gap therebetween.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slit screen for selecting high quality fibers from a fiber raw material liquid and a method for producing the slit screen.

[0002]

2. Description of the Related Art Conventionally, as a slit screen, a plurality of plate-shaped members are arranged in an annular shape at regular intervals, and the plate-shaped members are supported by a plurality of grooves formed in the annular member so that adjacent plate-shaped members are formed. It is known that a predetermined gap is formed between them (see Japanese Patent Application Laid-Open No. 8-226090).

There is also known one in which an adhesive is filled in a gap formed between the plate-shaped member and the groove (see Japanese Patent Laid-Open No. 2001-200488).

[0004]

However, in the screen having the above-described structure, the spacing between the adjacent grooves is small, and it cannot be said that the supporting strength of the plate-like member by the annular member is sufficient. The fiber raw material liquid is carefully selected in the gaps between the plate-shaped members, but at that time, a large force acts on the plate-shaped members, and the annular member may be damaged. In addition, since the space between the grooves, that is, the space between the plate-shaped members arranged there, becomes narrow, the flow resistance of the fiber raw material liquid is large and does not flow smoothly, which causes turbulence and entanglement of the fibers and reduces the processing capacity. Destroyed.

Therefore, it is an object of the present invention to provide a slit screen having excellent strength and capable of effectively and efficiently selecting a fiber raw material liquid, and a method for producing the slit screen.

[0006]

Means for Solving the Problems The present invention is, as a means for solving the above problems, a width portion is gradually reduced from a wide portion, and a narrow neck portion is provided with a locking portion wider than the narrow neck portion. A holding member in which a plurality of vertically elongated members having a transverse cross-sectional shape are arranged side by side with a predetermined gap size formed between adjacent wide portions, and the vertically elongated members are arranged at predetermined intervals along the longitudinal direction. In the slit screen in which the retaining portion is held in the holding concave portion, the longitudinal members differ in size from the wide portion to the narrow neck portion between adjacently arranged members,
The holding member is formed of at least two types, and the holding recesses are formed in the holding member so that the holding portions can be held in a state where the wide portions of the longitudinal members are aligned with a predetermined gap. is there.

With this structure, it is possible to widen the interval between the engaging portions, that is, the holding concave portions, of the adjacent longitudinal members,
It is possible to obtain sufficient holding strength for the vertically long member. Moreover, since the flow resistance of the fiber raw material liquid can be suppressed,
It is possible to improve the processing capacity while preventing the fibers from being disturbed and entangled. Further, it is possible to suppress the vibration of the vertically long member and prolong the life of the vertically long member itself.

When the vertical member is held by the holding member, the gap between adjacent portions of the vertical member is configured so as not to become smaller at least from the wide portion side toward the locking portion side, and the fiber length is further improved. It is preferable in that the raw material liquid can smoothly flow and the holding strength of the vertically long member by the holding member can be increased.

Further, as a means for solving the above-mentioned problems, the present invention has a cross-sectional shape in which the width dimension gradually decreases from the wide neck portion and reaches the locking portion wider than the narrow neck portion through the narrow neck portion. While forming a vertically long member having a holding recess formed to hold the thin neck portion and the locking portion from the edge of the holding member, and by inserting the thin neck portion and the locking portion into the holding recess, In the method of manufacturing a slit screen, in which the longitudinal members are arranged along the longitudinal direction of the longitudinal member at predetermined intervals and the longitudinal members are aligned so that a predetermined gap is formed between the wide portions, the longitudinal members are arranged adjacent to each other. At least two types having different sizes from the wide portion to the narrow neck portion are formed among the provided ones, and the wide portion of each of the longitudinal members is aligned with the holding member through a predetermined gap. So that each locking part can be held Is obtained so as to form the respective holding recess.

If the holding recess of the holding member is formed by laser processing, it can be processed accurately, the supporting state of the longitudinal member can be stabilized, and the gap size between the wide portions can be obtained with high accuracy. Is preferred.

[0011]

DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a slit screen according to this embodiment. In this slit screen, a plurality of vertically long members 1 are arranged in parallel to form a tubular shape, and a plurality of holding members 2 are provided.
As shown in FIG. 2, the rotor 4 having the stirring blades 3 therein is provided to be used for finely separating high-quality fibers and foreign matters in the fiber raw material liquid.

The longitudinal member 1 is made of stainless steel (SUS304, SUS304).
316 etc.) is formed by extrusion processing, etc.
As shown in (a), the cross-sectional shape from the wide portion 5 to the locking portion 8 wider than the narrow neck portion 7 through the inclined side surface 6 whose width dimension is gradually reduced is further formed. Have. The wide portion 5 includes an inclined front surface 9 that is inclined with respect to a straight line orthogonal to the axis (indicated by a chain line in FIG. 3). The inclined front surface 9 is separated from the stirring blade 3 toward the downstream side in the rotation direction R of the stirring blade 3. On the upstream side in the rotation direction R of the stirring blade 3, the side edge of the wide portion 5 is cut,
A flat surface 10 is formed. There are mainly two types of the vertically long members 1 having different lengths of the thin neck portion 7, and as shown in FIG.
And, as shown in FIG. 3 (c), the shorter second longitudinal member 1
There is b.

The holding member 2 is, as shown in FIG.
A ring-shaped plate material made of stainless steel (SUS304, SUS316, etc.), which is held at a predetermined pitch in the circumferential direction.
Are formed. The holding recess 11 can be formed with high accuracy by laser processing, and the shapes of the holding recesses 11 differ from each other. That is, the holding recess 11 includes a first holding recess 11a into which the first elongated member 1a is press fitted,
A second holding recess 11b into which the second vertical member 1b is press fitted.
It consists of and. Each of the holding recesses 11a and 11b has a shape that allows the vertically elongated member 1 to be press-fitted in the thickness direction.
The inclined groove 12 corresponds to the inclined side surface 6, the narrow groove 13 corresponds to the narrow neck portion 7, and the locking groove 14 corresponds to the locking portion 8. By pressing the vertically long member 1 into the holding recess 11, the wide portions 5 can be aligned in the circumferential direction while forming the gap g1.

Next, a method of manufacturing the slit screen having the above structure will be described.

First, the holding member 2 is positioned at a predetermined interval by a jig (not shown). At this time, the positions of the holding recesses 11 are made to match between the holding members 2. Then, the vertically long members 1a and 1b corresponding to the holding recesses 11a and 11b are sequentially press-fitted into a cylindrical shape. As a result, each longitudinal member 1a, 1
A predetermined gap g1 is formed between the wide portions 5b of b to selectively separate the good quality fiber of the fiber raw material liquid and the foreign matter, and the slit screen is completed.

The size of the gap g1 of the slit screen thus completed is determined on the basis of the type of fiber raw material liquid and the selection conditions. For example, 0.1 mm to 0.
It is set at 0.05mm increments until 3 mm (dimensional tolerance is 0.5~1.0 × ^{10 -} 3 mm). The width dimension of the wide portion 5 is based on the required opening ratio (the ratio of the gap g1 to the region where the wide portion 5 of the longitudinal member 1 is arranged), the strength required for the longitudinal member 1, and the like. It is determined. For example, it is set from 3.0 to 6.0 mm in 0.5 mm increments. The lengths (total length) from the wide portion 5 to the locking portion 8 are different between the adjacent vertically long members 1. The locking portion 8 of the vertically long member 1 having a short overall length is located substantially to the side of the narrow neck portion 7 of the vertically long member 1 having a long overall length. As a result, the fiber raw material liquid moves from the gap g1 to the gap g2 between the inclined side surfaces 6, the gap g3 between the locking portion 8 and the narrow neck portion 7, and further the gap g between the locking portions 8.
It flows to the outside through 4. The gap dimension is formed so as to expand from the gap g1 toward g4,
An increase in the flow resistance of the fiber raw material liquid is prevented. Table 1 shows an example of determining the dimensions of each part in the slit screen shown in FIG.

[0018]

[Table 1]

Next, the operation of the slit screen having the above construction will be described.

The slit screen is used as the screen body 1
5 (see FIG. 2), the fiber raw material liquid (paper pulp fiber liquid) is sequentially supplied into the slit screen. And the rotor 4 arranged in the slit screen
Rotate at high speed. The stirring blade 3 has a peripheral speed of about 2 at a short distance of 5 to 10 mm from the inner peripheral surface of the slit screen, for example.
It rotates at high speed at 0 m / s.

When the leading portion of the stirring blade 3 passes through the portion of the slit screen facing the gap 1, the fiber raw material liquid is pressurized and only the good quality fiber is extruded to the outside through the gap g1. The high-quality fiber extruded from the gap g1 flows to the outside after passing through the gap g2 of the inclined side surface 6, the gap g3 of the locking portion 8 and the narrow neck portion 7, and the gap g4 of the locking portion 8 to the outside,
It flows from the screen machine main body 15 to a pipe (not shown) and is collected. The gap size is formed so as to increase from the gap g1 toward g4. Therefore, the liquid containing the high-quality fibers extruded from the gap g1 is
It flows smoothly to the outside, and the fibers are not disturbed or entangled.

After that, when the latter half of the stirring blade 3 passes through the facing portion of the gap 1, a negative pressure is generated by the inclined front surface 9 of the longitudinal member 1, and the fibers clogged in the gap g1 are pulled back into the slit screen.

On the other hand, a large foreign matter contained in the fiber raw material liquid cannot be passed through the gap g1, is trapped, moves downward in the slit screen, and is collected through a pipe (not shown). After that, it is disposed of as a waste product.

When a series of such selective treatments, that is, extruding the high-quality fiber from the gap g1 by the stirring blade 3 and eliminating the clogging in the gap g1, a great force acts on the vertically elongated member 1. As described above, the holding member 2
Sufficient strength is obtained by ensuring a sufficient distance between the holding concave portions 11. Therefore, the holding member 2 may be damaged, or the vertical member 1 may vibrate,
The problem that the vertically long member 1 itself is damaged does not occur.

Although the fiber raw material liquid is extruded from the inside to the outside of the slit screen in the above-described embodiment, it may be press-fitted from the outside to the inside. In this case, the slit screen needs to be configured such that the wide portions 5 of the vertically long member 1 are aligned on the outer peripheral side of the holding member 2 and the stirring blades 3 of the rotor 4 are rotatable on the outer peripheral portion of the slit screen. .

In the above embodiment, the slit screen has a cylindrical shape, but it may have a flat plate shape.

Further, in the above-mentioned embodiment, the longitudinal member 1 is press-fitted into the holding concave portion 11 of the holding member 2. However, it may be fixed by another means such as caulking, bonding, welding after insertion. I do not care.

In the above embodiment, the vertically long member 1 is also provided.
Although two types (1a, 1b) having different lengths are used, three types or more having different lengths may be used. However, in consideration of the radial size of the holding member, it is preferable that the holding member is composed of two types.

[0029]

As is apparent from the above description, according to the present invention, a vertically elongated member having different sizes from the wide portion to the narrow neck portion is held so that the wide portion is aligned with a predetermined gap. Since the members are held, the gap between the holding recesses adjacent to each other is widened, and the holding strength of the vertically long member by the holding member can be increased. Further, by widening the interval between the locking portions of the vertically long member, it is possible to suppress an increase in flow resistance of the fiber raw material liquid passing therethrough, reduce turbulence and entanglement of the fibers, and improve the processing capacity. . Moreover, it is possible to suppress the force that acts on the longitudinal member and the vibration that accompanies this when the fiber raw material liquid passes through the gap between the adjacent wide portions, so that it is possible to improve the durability of the longitudinal member itself. .

[Brief description of drawings]

FIG. 1 is a front view of a slit screen according to the present embodiment.

FIG. 2 is a plan view of FIG.

3A is a cross-sectional view taken along the line AA of FIG. 1, FIG. 3B is a cross-sectional view of a first vertically elongated member, and FIG. 3C is a cross-sectional view of a second vertically elongated member (hatching is omitted). .

[Explanation of symbols]

1 ... Longitudinal member 2 ... Holding member 3 ... Stirring blade 4 ... rotor 5 ... Wide part 6 ... inclined side 7 ... Narrow neck 8 ... Locking part 9 ... Sloped front 10 ... Flat surface 11 ... Retaining recess

Claims (4)

(57) [Claims] 1. A vertically elongated member having a cross-sectional shape in which the width dimension is gradually reduced from the wide portion and reaches a locking portion wider than the narrow neck portion through a narrow neck portion, is provided between adjacent wide portions. A slit screen comprising a plurality of juxtaposed while forming a predetermined gap size, and holding the locking portion in a holding concave portion of a holding member arranged at predetermined intervals along the longitudinal direction of the longitudinal member, The vertically long members are configured by at least two types in which the sizes from the wide portion to the narrow neck portion are different between those arranged adjacent to each other, and the holding member has a predetermined wide portion of each of the vertically long members. A slit screen, characterized in that each of the holding recesses is formed so as to hold each locking portion in a state of being aligned through a gap. 2. The holding member holds the vertically long member, and the gap size between adjacent portions of the vertically long member does not decrease at least from the wide portion side toward the locking portion side. The slit screen according to claim 1. 3. A longitudinal member having a cross-sectional shape in which the width dimension is gradually reduced from the wide portion to reach the locking portion wider than the narrow neck portion through the narrow neck portion, while the edge portion of the holding member is formed. A holding recess for holding the thin neck portion and the locking portion is formed, and the thin neck portion and the locking portion are inserted into the holding recess, whereby the holding members are arranged at predetermined intervals along the longitudinal direction of the longitudinal member. In the method for manufacturing the slit screen in which the longitudinal members are aligned so that a predetermined gap is formed between the wide portions, the longitudinal members are arranged between the wide portions and the narrow neck portion. At least two types having different dimensions are formed, and each holding recess is formed in the holding member so that each locking portion can be held in a state in which the wide portions of the vertically long members are aligned with a predetermined gap. Forming a slit Method for producing clean. 4. The method of manufacturing a slit screen according to claim 3, wherein the holding recess of the holding member is formed by laser processing.