JPS607046B2 - Pulp particle manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for producing pulp-like particles, and more specifically, a synthetic polymer solution and a precipitant solution are brought into contact with each other under high shear force to produce pulp-like synthetic polymer particles. The present invention relates to an apparatus for producing coalesced particles.

The pulp-like particles referred to in the present invention are flexible fine particles that have a fibrous or thin leaf-like shape, each particle does not have the same shape, have a large surface area, have a high water absorption capacity, and are intertwined with each other. It has a large ability to easily produce paper-like or sheet-like articles by depositing the particles alone or in an aqueous dispersion solution mixed with short fibers on a wire mesh.

When a synthetic polymer solution and a precipitant solution are brought into contact to form precipitated particles, the shearing force applied to both solutions during contact has a large effect on the shape of the particles.

That is, when the number shear force applied to both solutions is large, the precipitated particles have a fibrous or thin leaf-like worn shape, and in the opposite case, they have a shape close to spherical. Therefore, in order to produce pulp-like particles, it is necessary to install a region in the apparatus where high shearing force is applied and to have a means for guiding both solutions to the high shearing force region. 0 However, the solution containing pulp-like particles formed by bringing both solutions into contact is viscous and contains pulp-like solids, so the flow rate decreases in devices where the flow direction of the solution changes in a complex manner. Sometimes, the pulp-like particles become clogged in the device, making it impossible to flow.

As a result of intensive research in order to solve the above problems, the present inventors fixed a stator with holes on the inner wall of the pipe and rotated the turbine at high speed in close proximity to the stator. By providing a supply port for the synthetic polymer solution and a precipitant solution near the front of the turbine in the direction of the rotational axis of the turbine, and providing an outlet for pulp-like particles at the rear of the turbine, After both solutions are introduced and pulp particles are formed in the high acid shear region, the solution can be guided almost linearly through the holes in the stator to the outlet at the rear of the stator. The present invention was achieved by discovering that pulp-like particles can be produced continuously without clogging of the particles within the apparatus.

That is, the present invention includes, in the pipe 10, a pipe-like member for fixing the turbine to the drive shaft, a disc fixed to the tip of the pipe-like member perpendicularly to the length direction of the pipe, and the disc. The turbine 20 has a plurality of blade-shaped parts fixed to the upper part and protrudes toward the front of the turbine, and the rotation axis of the turbine 20 is on the center line in the length direction of the pipe. one or more pairs of stators 30 having one or more holes drilled in the length direction of the pipe at a rear position of the blade-like member so that the particle-dispersed solution can enter from the turbine side and pass to the rear of the turbine; On the synthetic polymer solution/precipitant solution supply side of the pipe, there is a synthetic polymer solution supply port 41 that opens in the direction of the turbine drive shaft at a forward position near the turbine, and a precipitant solution supply port 41. Mouth 4
2 and 2 are arranged so that both liquids can be supplied simultaneously, and an outlet 45 for the pulp-like particle dispersion solution is arranged on the discharge side at a rear position of the turbine. be.

A specific example of the apparatus for producing pulp-like particles according to the present invention is shown in FIGS. 1 and 2.

FIG. 1 is a longitudinal assembled sectional view of the device of the present invention;
FIG. 2 is a sectional view taken along line 1--1 in FIG. This device includes a pipe 10 and a turbine 2 fixed to a drive shaft 1.
It is mainly composed of a stator 30 fixed in a pipe 10, a fully synthetic polymer solution supply port 41, a precipitant solution supply port 42, and a pulp-like particle dispersion solution discharge port 45. To explain in more detail, pipe 1 river, that-
The stator 30 is comprised of a portion 11 whose inner diameter is equal to the outer diameter of the stator 30, a portion 12 smaller than the outer diameter, and flange portions 13 and 14.

The length of the portion 11 in the drive shaft direction matches that of the stator 30. By inserting the stator 30 here and bringing the flange portion 13 into close contact with the flange portion 14, the position of the stator 30 in the drive shaft direction is fixed. A pin-shaped protrusion 33 is attached to the flange portion 13, thereby fixing the position of the stator 30 in the rotational direction of the drive shaft. The inner wall 19 extends to the tip of the wing-like member 22 at 20. The joint surfaces of the flanges 13 and 14 are smooth surfaces and are sealed with an O-ring 17, and the bolts 18 and screws cut in the flange 14 are sealed. Turbine 2
0' is composed of a disk 21, a pipe-like member 23 for fixing the turbine 20 to the drive shaft 1, and a vane-like member 22 fixed on the disk 21, whose rotation axis is connected to the pipe 1.
0 on the longitudinal center line.

The disk 21 is fixed to the tip of the pipe-like member 23 perpendicularly to the length direction of the pipe 10. The pipe-shaped member 23 is internally threaded in order to fix the turbine 20 to the drive shaft 1, and this thread connects the turbine 20 and the stator 30.
The distance between the two sides is made closer, and preferably, the distance can be adjusted to two sides or less. Since the turbine 20 rotates at high speed in close proximity to the three stators, a high shearing force is generated in the gap, and pulp-like particles are formed by the synthetic polymer solution and precipitant solution flowing into the gap. Ru. The blade-like members 22 of the turbine 20 are fixed on the disc 21 and protrude toward the front of the turbine 20, but they may have any shape as long as they have a structure that allows them to be very close to the stator. Examples include a planar structure such as this, a planar structure twisted in the opposite direction to the rotational direction of the turbine, and a structure in which the cross section of the blade-like member increases in the radial direction.

In addition, the number of blade-like members 22 is determined to ensure that the inflowing synthetic polymer solution and precipitant solution are transferred between the turbine 20 and the stator-3 with high probability.
It is preferable that the number of sheets be at least two or more in order to guide the sheet into the gap between the sheet and the sheet. The stator 301 has a plurality of holes 31 drilled in the length direction of the pipe 10 at a rear position of the blade-like member 22 so that a solution containing pulp-like particles formed in the gap between the turbine 20 and the stator 30 can be absorbed. , turbine 2
Enter into the air hole 31 of the stator from the 0 side and enter the turbine 2.
It has a structure that allows it to pass behind 0. The number of holes may be any number as long as it is one or more, and the shape may be any shape such as a cylindrical shape or a cylindrical shape. However, the area occupied by the holes in the cross section of the stator 30 when cut in the direction perpendicular to the drive shaft 1 is 9.0
It is preferable not to exceed %Z. When it exceeds 90%, it's evening.
Since the amount of the precipitant solution and the synthetic polymer solution that cannot enter the high-shutdown region of the gap between the bottle 20 and the stator 30 increases, the number of coarse particles increases and non-uniform pulp-like particles are formed, which is undesirable.

The supply port 41 for the Z synthetic polymer and the supply port 42 for the precipitant solution are located at the front near the turbine in the direction of the drive shaft of the turbine 20, and as shown in FIG. Although it is preferable to embed the solution conduit 44 in order to mix both solutions uniformly, it is also possible to have a structure in which different conduits are led to just before the turbine 20. Between the supply ports 41 and 42 of both solutions and the turbine 20, both solutions come into contact under a low acid shear force.
The distance from 1,42 to the turbine 20 is preferably 20
It should be less than c, more preferably 10 cm or less; if it is more than 20 cm, there is a tendency for near-spherical particles or coarse particles to be mixed into the formed particles.

An outlet 45 for the pulp-like particle dispersed solution is located at the rear of the turbine 20 so that the solution can flow approximately linearly within the device.

Therefore, the present apparatus has a low flow resistance, prevents part of the apparatus from becoming clogged with formed particles, and has a high production rate. If only one pair of turbine 20 and stator 30 is insufficient to provide sufficient cutting force, or the formed pulp particles are coarse, and it is necessary to grind them further, one or more pairs of turbine and stator should be operated. is also possible.

Further, a turbine and a stator may be connected to provide pumping ability to this manufacturing apparatus. This device rotates a drive shaft 1 and a turbine 20 fixed on the same axis at high speed, and pumps a synthetic polymer solution through a supply port 41 and a precipitant solution through a supply port 42. and the stator 30, and the solution in which the formed bulb-shaped particles are dispersed passes through the holes 31 in the stator 30 and is taken out from the discharge port 45 to operate. be able to.

Below is an example of an operation test of this device. Polymetaphenylene isophthalamide 14% by weight, calcium chloride 4%
A polymer solution consisting of 82% by weight of N,N-dimethylacetamide was fed through the supply port 41 at a rate of 1.5% per minute, and glycerin as a precipitant was fed at a rate of 47% per minute from the supply port 42 at a rate of 360% by weight. Turbine 2 rotating at pm
0 and the stator 30, and a dispersion solution containing pulp-like particles was taken out from the outlet 45 at a rate of about 48.5 per minute.

The taken out dispersion solution was filtered through a filter and washed with water to obtain purified pulp-like particles. The obtained particles could easily be mixed with short fibers of polymetaphenylene isophthalamide, dispersed in water, and deposited on a wire mesh to give a paper-like material.

[Brief explanation of drawings]

0 FIG. 1 is a longitudinal assembled sectional view of the device of the present invention, and FIG. 2 is a sectional view taken along the line 1--1 in FIG. 1... Drive shaft, 10... Pipe, 20...
...Turbine, 30...Stator "41...
...Synthetic polymer 5 solution supply port 42...Precipitant solution supply port, 45...Discharge port.

Claims (1)

[Claims] 1. In the pipe 10, a pipe-like member for fixing the turbine to the drive shaft, a disc fixed at the tip of the pipe-like member perpendicular to the length direction of the pipe, and fixed on the disc, The turbine 20 is made up of a plurality of blade-like members protruding toward the front of the turbine, and its rotation axis is on the center line in the longitudinal direction of the pipe. One or more pairs of stators 30 are built in, the stator 30 having one or more holes bored in the length direction of the pipe at a rear position of the blade-like member so that the pipe can enter from the side and pass behind the turbine, In addition, on the synthetic polymer solution/precipitant solution supply side of the pipe, a synthetic polymer solution supply port 41 and a precipitant solution supply port 42, which are open in the direction of the turbine drive shaft at a forward position near the turbine, are provided. A device for producing pulp-like particles, characterized in that the liquid is arranged so that liquids can be supplied simultaneously, and a discharge port 45 for a pulp-like particle dispersion liquid is arranged on the discharge side at a rear position of the turbine.