JP2002146687A - Rotor for pulper and pulper using the rotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor for a pulper, for efficiently disaggregating a raw material such as a raw material pulp, a waste paper or a broke. SOLUTION: This rotor for the pulper is obtained by bundling innumerable bristles 3 and attaching the bundled bristles 3 to a bristle-holding part 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulper for converting raw pulp or waste paper into a slurry at the beginning of a papermaking process.

[0002]

2. Description of the Related Art Pulppers are used at the beginning of a papermaking process when raw pulp or waste paper is mixed with water to form a slurry. As shown in FIG. 10, a general pulper is provided with a rotor 53 having a plurality of blades attached to a rotating shaft 54 at the bottom of a tank 51 containing raw materials such as waste paper and water, and rotating the rotor 53 at high speed. Circulates to cause the disintegration of the raw material.

FIG. 11 is an explanatory view of a rotor 53 used in the pulper shown in FIG. 10, and FIG. 12 is a partial sectional view of the rotor 53. The rotor 53 includes a rotor blade 57 having a plurality of blades 55, and a bottom plate 59 provided below the rotor blade 57 with a certain clearance P (see FIG. 12). A large number of grooves 57a are formed on the back surface of the rotor blade 57 so that the raw material can be ground in cooperation with a large number of holes 59a formed in the bottom plate 59.

The operation of the pulper configured as described above will be described. A container is filled with fresh water and a raw material such as waste paper or raw pulp having a weight ratio of 4 to 6% with respect to the fresh water. When the rotor blade 57 rotates, the blade 55 of the rotor blade 57 generates a circulating flow (a flow in which the entire liquid in the tank circulates and circulates) as shown by a broken line in FIG. Finely disintegrated. Further, it is further finely loosened by grinding in the gap between the back surface of the rotor blade 57 and the bottom plate 59.

[0005]

However, in the rotor 53 as described above, most of the power is consumed to cause the circulation, and the disaggregation is mainly performed by the circulation. In particular, after the degree of disaggregation has progressed to a certain degree, the amount of raw material in the circulation is merely rotating, and the amount of the material crushed under the rotor blade 57 is small, so that the speed of the disaggregation is slow. It takes a long time to reach the required degree of disaggregation. Since the disintegration speed of the conventional pulper is low, when the degree of disintegration reaches a certain level, the slurry-like raw material is discharged by a pump and processed by another unraveling machine (refiner). In some cases, treatment with hot water or chemicals may be used.

[0006] As described above, the conventional pulper rotor has a problem that the disintegration efficiency is poor and it takes a long time to obtain a required degree of disintegration.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to obtain a rotor for a pulper for efficiently disintegrating a raw material such as raw pulp, waste paper or waste paper. The purpose is to get the pulper that was.

[0008]

Means for Solving the Problems (1) A rotor for a pulper according to the present invention is obtained by bundling and attaching a myriad of bristles to a bristle holding portion.

(2) The bristles are characterized in that they are bundled into a plate having a certain thickness.

(3) The bristles are made of a wire.

(4) The pulper according to the present invention is the above (1).
A pulper rotor according to any one of (1) to (3) is used.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Various types of rotors for pulpers have been developed, all of which are shown in FIG.
In this method, a circulation is induced by a plurality of blades as shown in FIG. However,
The disintegration force due to circulating flow was weak and it took a long time to reach a constant degree of disintegration. Therefore, as a result of diligent research, the inventor has been able to efficiently promote disaggregation by changing the conventional concept of disaggregation mainly by circulating, and disintegrating the raw material in the circulating flow in addition to disaggregating by circulating. I got the idea that it might be.

The present invention has been made based on such an idea, and FIG. 1 is a perspective view of a rotor according to an embodiment of the present invention which embodies this idea. As shown in FIG. 1, the rotor 1 is formed by bundling innumerable thin wires 3 around a disc-shaped holding section 5 into a disc having a certain thickness. A mounting hole 7 for mounting a rotating shaft for rotating the rotor 1 is provided at the center of the holding portion 5. The wires 3 are bundled in a donut shape such that innumerable thin wires are entangled like a wire brush, and the distal end portion of the wire 3 is arranged on the outer peripheral portion. Thus, the rotor 1 according to the first embodiment has a form like a wire wheel used as a wire brush.

FIG. 2 is an explanatory view of a pulper using the rotor 1 shown in FIG. The pulper according to the present embodiment has basically the same configuration as that of the conventional example shown in FIG. 10 except that the rotor 1 is used, and the rotor 1 is attached to the rotating shaft 11 provided at the bottom of the tank 9. , This rotor 53
Is rotated at high speed.

In the pulper configured as described above, when the rotor 1 is rotated at a high speed as in the conventional example,
A stronger circulation is generated than in the conventional example, and rapid disaggregation is performed. This is because the countless thin wires 3 act to scrape the raw material by scraping the raw material, and at the same time act to throw the raw material in the tangential direction of the rotor 1 to induce a circulating flow at the time of the throwing. That is, by using the rotor 1, the disaggregation by scraping and the disaggregation by strong circulation are performed at the same time, and the efficient disaggregation is realized.

In order to demonstrate the effect of the present embodiment, the degree of disaggregation was compared between the rotor 1 of the present embodiment and the conventional rotor 53. The experimental conditions are as follows. Raw material: Newspaper Raw material concentration: 6% Water: tap water Rotor rotation speed: 2100 rpm Rotor diameter: 15 cm of the present embodiment, 20 cm of conventional rotor

FIG. 3 is a graph showing the experimental results, in which the vertical axis represents the degree of disaggregation (%) and the horizontal axis represents the processing time (minutes).
The solid line in the graph is that of the rotor of the present embodiment,
The broken line is that of the conventional rotor. As can be seen from this graph, in the rotor of the present embodiment, the disintegration progresses rapidly, and 95% or more of the disintegration is completed when about 5 minutes have elapsed. On the other hand, in the conventional rotor, only about 60% has progressed after 5 minutes.

In this embodiment, the degree of disaggregation is 9
Disintegration is progressing at a stretch until it reaches 0%, and no decrease in disintegration power is seen in the latter half of disintegration. On the other hand, in the conventional rotor, the degree of disaggregation gradually progresses after progressing about 50%. For this reason, in the present embodiment, it takes about 7 minutes to reach complete disaggregation, but in the conventional rotor, it takes about 2 minutes.
It takes 0 minutes. As described above, in the rotor of the present embodiment, the time required until complete disaggregation is reduced to less than half that of the conventional rotor. And, although the above-described high-speed defibration was enabled, no damage was found in the fibers of the raw material at the time of defibration.

Further, as confirmed by another experiment, according to the rotor of the present embodiment, the raw material concentration was 7%.
%.

As described above, according to the present embodiment, the processing can be performed in a short time by a strong disintegration force, so that the energy saving effect is large. In addition, the efficiency can be improved and the equipment can be downsized. Further, since the rotor 1 is simply attached to the rotating shaft as in the conventional case, the present invention can be applied to a conventional pulper.

Further, the rotor 1 of the present embodiment has the effect that the hair tips have a fixed length, so that the rotor 1 can bend even with a hard raw material and is not damaged.

The shape of the rotor may be the following, in addition to the shape shown in FIG. FIG. 4 is a plan view of another example of the rotor, and FIG. 5 is a sectional view taken along line AA of FIG. In this example, countless wires 3 are planted upward on the upper surface of the disc-shaped holding plate 15.
FIG. 6 is a plan view of another example of the rotor, and FIG. 7 is a sectional view taken along line BB of FIG. In this example, the middle of the disk 17 serving as a holding portion of the wire 3 is bent upward to form an inverted truncated cone, and the wire 3 is planted obliquely upward.

Further, the outer peripheral shape of the rotor may be changed by changing the length of the wire 3. As such an example, the outer peripheral shape of the rotor may be jagged when viewed from a plane as shown in FIG. 8, or the unevenness curve may be smooth as shown in FIG. 9. May be used.

In the above embodiment, the pulper in which the rotor 1 is provided at the bottom of the tank 9 has been described as an example, but the pulper of the present invention is not limited to this.
The rotor 1 may be provided on the side wall of the tank.
In addition, a wire has been described as an example of the bristles, but this is not excluded as long as the same function as the wire is exhibited.

[0025]

As described above, in the present invention, the bristles are bundled and attached to the bristle holding portion to form a rotor for the pulper, so that the disaggregation by scraping and the disaggregation by the strong circulation are simultaneously performed. Efficient disaggregation is realized.

[Brief description of the drawings]

FIG. 1 is a perspective view of a rotor according to an embodiment of the present invention.

FIG. 2 is an explanatory view of a pulper on which the rotor shown in FIG. 1 is installed.

FIG. 3 is a graph showing experimental results for demonstrating the effect of one embodiment of the present invention.

FIG. 4 is an explanatory diagram of a modified example of the rotor according to the embodiment of the present invention.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is an explanatory diagram of another modified example of the rotor according to the embodiment of the present invention.

FIG. 7 is a sectional view taken along line BB of FIG. 6;

FIG. 8 is an explanatory diagram of another modified example of the rotor according to the embodiment of the present invention.

FIG. 9 is an explanatory diagram of another modified example of the rotor according to the embodiment of the present invention.

FIG. 10 is an explanatory view of a conventional pulper.

FIG. 11 is an explanatory view of a conventional rotor.

FIG. 12 is a partial cross-sectional view of a conventional rotor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotor 3 Wire 5 Holding part 9 Tank 11 Rotation axis

Claims (4)

[Claims] 1. A rotor for a pulper, wherein countless bristles are bundled and attached to a bristle holding portion. 2. The pulper rotor according to claim 1, wherein the bristles are bundled into a plate having a certain thickness. 3. The pulper rotor according to claim 1, wherein the bristles are made of a wire. 4. A pulper comprising the pulper rotor according to claim 1.