JPS5929997Y2 - pulp disintegrator - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a pulp disintegrator.

Traditionally, pulp disintegrators have been used to further disintegrate papermaking raw materials (hereinafter referred to as pulp) such as valve seats and waste paper that have been coarsely disintegrated in water using pulper equipment, depending on the quality of the paper. Examples of this pulp disintegrator include those shown in FIGS. 1A and 1B.

This pulp disintegration machine has a rotor 2 in a hollow disintegration section 1.
and a stator 3, the pulp is passed between them and the rotor 2 is rotated to disintegrate the pulp.

The rotor 2 is attached to one end of a drive shaft 5 that is rotatably supported by a bearing housing 4, and has a radially outwardly extending portion on its outer periphery as shown in FIGS. 1A, B and 2. A large number of rotary blade pieces 2a, 2a, .
are provided in multiple stages with different rotation radii.

In addition, each rotary blade piece 2a divided into multiple stages in this way
2a... are arranged in descending order of rotational radius along the flow direction of the pulp in the disintegrating section 1 (the direction in which it flows from the inlet 1a and flows out from the outlet 1b, as shown in FIG. 1). .

On the other hand, on the inner periphery of the stator 3, a large number of fixed blade pieces 3a, 3a, etc. are provided which have gaps in the axial direction and radial direction between them and the rotary blade piece 2a. Blade pieces 3a and 3a are shown in Fig. 1A.

As shown in FIG. B and FIG. 3, the rotary blade pieces 2a, 2a, . There are multiple stages.

Further, in the axial gap 81 and the radial gap t1 between the rotary blade piece 2a and the fixed blade piece 3a, it is desirable that the radial gap t1 in particular be made as small as possible in order to finely disintegrate the pulp.

However, if these gaps 81jtl are made smaller, the power required to rotate the rotor 2 increases and the amount of pulp that can pass through them decreases, so they are usually set to 1.5 degrees or more.

By the way, to explain the valve seat disintegrated by this pulp disintegrator, this valve seat is cut into a size of about 1 meter square for ease of transportation, etc., and the shear during this cutting is The force can compress the fibers at the cut surface and cause them to harden.

When such a valve seat is used as a raw material, if the hardened fibers are not sufficiently disintegrated and pass through the above-mentioned gap and mix into the normal pulp, uneven parts will occur in the manufactured paper. It is possible.

Furthermore, when disintegrating strong waste paper such as cardboard or kraft paper, there is a possibility that fibers that have not been sufficiently disintegrated may be mixed into normal pulp.

This idea was proposed in consideration of the above-mentioned circumstances, and it narrows the radial gap between the rotary blade pieces and fixed blade pieces formed on the rotor and stator of the pulp disintegrator, respectively, and also reduces the axial gap between them. The purpose of this is to increase the disintegration ability of the pulp disintegrator by setting the gap several times the radial gap.

This invention will be explained below based on an embodiment shown in the drawings.

In the figure, parts common to those of the conventional example are given the same reference numerals to simplify the explanation.

FIGS. 4A and 4B show an embodiment of this invention.

In the pulp disintegrating machine of this embodiment, the radial gap t2 between the rotary blade piece 2a of the rotor 2 and the fixed blade piece 3a of the stator 3 is narrower than that of the conventional example, and the pulp flow direction (Fig. 4A , from left to right in B)
The gap s2 between the axially opposing sides of the fixed blade piece 3a on the upstream side and the rotary blade piece 2a on the downstream side of the fixed blade piece 3a is set to be several times larger than the gap t2. has been done.

As a result of testing the disintegrating ability using various combinations of the dimensions of the axial gap S2 and the radial gap t2 between the rotating blade piece 2a and the fixed blade piece 3a, the results showed that good disintegrating ability was obtained with the set dimensions shown in Table 1. I was able to get

When this test was conducted, the outer diameter of the rotor 2 was 280 mm, the rotation speed of the rotor 2 was 3600 rpm, and the pulp used for disintegration had a concentration of 4.5 ± 0.5%.
It was LBKP (bleached hardwood pulp) at room temperature.

In addition, tests are being continued regarding the combination of the gap 52tE2 that can further enhance the disintegration ability.

Moreover, the gap s in the axial direction between the rotating blade piece 2a and the fixed blade piece 3a
2 can be easily adjusted by, for example, inserting an adjusting shim 6 between the stator 3 and a stepped portion 1c formed in the disaggregation portion 1 for fitting the stator 3, and in the illustrated example, the stepped portion 1c By increasing the thickness of the adjustment shim 6 between the stator 3 and the stator 3, a gap s2 can be created.

The pulp disintegrator configured in this way has a gap t2 in the radial direction between the rotating blades of the rotor and the fixed blades of the stator.
Since it can be sandwiched between the valve seats, it is possible to finely disintegrate fibers hardened by the cut portion of the valve seat, cardboard base paper, kraft paper, etc. that are difficult to disintegrate.

On the other hand, by widening the axial gap s2 between the rotating blades of the rotor and the fixed blades of the stator to at least several times the gap t2, a sufficient amount of pulp can be ensured.

Therefore, due to these synergistic effects, it is possible to obtain a high disintegrating ability with the same level of required power as in the conventional method, which is an excellent effect.

[Brief explanation of the drawing]

Figures 1A, B to 3 show conventional examples of pulp disintegrators, where Figure 1A is a side view with a part of the pulp disintegrator cut away, and Figure 1B is B of Figure 1A. FIG. 2 is a plan view of the rotor, and FIG. 3 is a plan view of the stator. Figures 4A and 4B show an embodiment of this invention.
FIG. 4B is an enlarged view of section B in FIG. 4A. 1... Disintegration section, 2... Rotor 2a
...Rotary blade piece, 3 ...Stator 3
a...Fixed blade piece, 6...Adjustment shim.

Claims (1)

[Scope of utility model registration request] In a pulp disintegrating machine that performs disintegration by passing pulp between a rotor having multiple stages of rotating blades having different rotation radii and a stator having a fixed blade forming a gap between the rotating blades, A pulp disintegrator characterized in that the axial gap between the rotary blade piece and the fixed blade piece is set to be several times or more the radial gap between the rotary blade piece and the fixed blade piece.