JP2002285484A - Apparatus for treating froth - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate handling in a floss treating step by promoting the foam breakage of froth. SOLUTION: This apparatus for treating the froth is obtained by installing a reducer 17b reducing the pipe diameter in the course of a floss discharging pipe 17 connected to a froth discharging outlet 15d of a hermetically sealed pressurizing type flow tester 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deinking method in which waste ink such as newspapers is disintegrated and carefully selected, and a waste paper recovery facility is used as a papermaking raw material. The present invention relates to a floss processing device of a flotation device for use.

[0002]

2. Description of the Related Art As a method of deinking used paper, there are a floating method (flotation method), a cleaning method (washing method), and a method combining these floating methods and a cleaning method. The floating method is a method in which air is mixed into a used paper raw material liquid that has been subjected to a chemical treatment after disaggregation, and the ink particles that have been released are adsorbed and floated by generated bubbles, and then separated and removed. The cleaning method is a method in which the liberated ink is washed away with a large amount of water and removed.

FIG. 5 is a schematic view of a conventional deinking flotation apparatus. FIG. 6 is a cross-sectional view of a flotation device for ink removal disclosed in Japanese Patent Application Laid-Open No. 3-130483 filed by the present applicant. FIG.
In FIG. 6, common parts are denoted by the same reference numerals and described. 1 is a raw material inlet, 2 is a raw material outlet, 3 is a bubble generator, and 4 is a floss trough. Reference numeral 5 denotes a cell (floatator), which comprises a cylindrical member 5a and end plates at both ends. 5d is a rectangular frame member projecting outside the other side of the cylindrical member 5a, 5e is an upper cut surface on one side of the cylindrical member 5a, 5f is a bottom plate of the projecting frame member 5d, The trough 4 is formed by 5d and the bottom plate 5f. 7 is a raw material liquid, 8 is a free liquid surface of the raw material liquid, 9 is a floss, 10 is a fine bubble, and 11 is a spiral streamline. The raw material inlet 1 is provided at one end of the floatator 5, and the raw material outlet 2 is provided at the other end of the cell 5 symmetrically with the raw material inlet 1. The bubble generator 3 is suspended between the head plates in the lower part of the floatator 5 and includes a turbine rotor 3a and a turbine rotor 3a.
And an air supply pipe 3b provided in close proximity to the upper side of the air conditioner.

The raw material liquid 7 flows from the raw material inlet 1 in the axial direction of the cylinder, changes its direction by approximately 90 °, and flows tangentially into the bottom at one end of the floatator 5. The raw material liquid 7 that has flowed into the floater 5 proceeds as it is by the inertia force at the time of flow and reaches the bubble generator 3, where the fine bubbles 10 are uniformly mixed into the raw material liquid 7 by the bubble generator 3. The raw material liquid 7 containing bubbles becomes a spiral streamline 11 due to the centrifugal force and the circulating action, reaches the free liquid surface 8 as an ascending flow, and further flows along the free liquid surface 8 toward the floss trough 4. Meanwhile, the fine bubbles 10 become floss 9 and stay on the free liquid surface 8. Thus, the mixing and separation of the raw material liquid 7 and the fine bubbles 10 are repeatedly performed. The raw material liquid 7 flows out of the raw material outlet 2 as a flow along the spiral streamline 11.
The floss 9 staying on the free liquid level 8 overflows and flows down into the floss trough 4, and as shown in FIG.
2 to the storage tank 13. Storage tank 1
The liquid defoamed in 3 is sent to a secondary floatator by a pump, and high-quality fibers are collected.

[0005]

The flotation device for deinking is open to the atmosphere, stores the floss in the storage tank 13 by dripping down only by the force of gravity, and waits for the defoaming of the floss. It takes a long time to carry out the process, and the storage tank 13 becomes large, so that the equipment cost increases. Also,
Although a defoaming shower is used in the storage tank 13, the flow rate increases by that amount, so that the load on the secondary floatator increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems. When floss passes through the floss outflow tube, the floss breakage is promoted in the floss outflow tube to promote the floss processing step. An object of the present invention is to provide a floss processing device that can facilitate handling.

[0007]

According to the floss processing apparatus of the present invention, a reducer for reducing the diameter of a floss outlet pipe connected to a floss outlet of a sealed pressurized type flotator is provided. .

Next, the operation of the present invention will be described. Since a reducer is provided in the middle of the floss outlet pipe connected to the outlet of the sealed pressurized type floatator, the flow rate of the floss flow increases in the reducer, and the pressure rapidly drops, so that the floss breaks down and the floss is mixed with the liquid. Separate into air. The air is discharged to the outside as it is, and the liquid is sent to a post-processing step. Since the volume of the liquid is extremely small compared to the volume of the floss, the processing becomes easy. Therefore, a large floss storage tank is not required, and the equipment cost is reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic perspective view of a floss processing apparatus according to the present invention. FIG. 2 is a cross-sectional view of the upper part of the sealed pressurized type floatator. FIG. 3 is a partial sectional view of the floss outlet pipe. Note that the same parts as those shown in FIGS. 5 and 6 are described with the same reference numerals. In FIGS. 1 to 3, reference numeral 15 denotes a closed pressurized type floatator.
It comprises a cylindrical member 15a and end plates 15b, 15c at both ends. 15d is a floss outlet. 1 is a raw material inlet provided in the floatator 15, 2 is a raw material outlet, and 3 is a bubble generator. Reference numeral 16 denotes a floss collection pipe disposed above the floater 15 along the longitudinal direction of the floater 15. Reference numeral 16a denotes a slot-shaped opening (slit) provided on the upper surface of the floss collection tube 16, and 16b denotes a floss inflow member provided on both sides of the opening 16a so as to protrude upward.
The floss collection pipe 16 collects the floss 9 floating in the flotator 15 through the floss inflow member 16b and the opening 16a, and causes the floss 9 to flow down to the floss outflow pipe 17.

The floss outlet pipe 17 has a large-diameter pipe 17a having a proximal end connected to the outlet 15d of the floatator 15, a small-diameter pipe 17c having a distal end connected to a floss storage tank 19, and a flange 18 provided therebetween. And a reducer 17b connected thereto. As shown in FIG. 3, the reducer 17b has one end having the same diameter as the large-diameter tube 17a, the other end having the same diameter as the small-diameter tube 17c, and narrowing the upper surface side so that the cross-sectional area becomes almost half in the middle. . When the floss 9 passes through the reducer 17b, the flow velocity increases at the throttle portion of the reducer 17b, and the pressure drops rapidly, so that the floss 9
Breaks into bubbles and separates into liquid 21 and air 20. The liquid 21 flows down to the storage tank 19 through the small diameter pipe 17c,
0 is released into the outside air.

Next, the operation based on the embodiment will be described. Since the reducer 17b is provided in the middle of the floss outlet pipe 17 connected to the outlet 15d of the sealed pressurized type floatator 15, the flow rate of the floss flow increases in the reducer 17b, and the pressure drops rapidly, so that the floss 9 breaks. Then, the floss 9 is separated into the liquid 21 and the air 20. The air 20 is discharged as it is to the outside, and the liquid 21 is sent to a post-processing step. Since the volume of the liquid 21 is extremely smaller than the volume of the floss 9, post-processing is facilitated. Therefore, the floss storage tank 19 does not need to be large, and the equipment cost is reduced. Further, since the defoaming shower is not required, the load on the secondary floatator is reduced.

Next, experimental results for verifying the effect of the present invention will be described. FIG. 4 is a diagram showing a change in the amount of air mixed in the floss of the closed pressurized type floatator. In the figure, the left frame shows the location, the center shows the shape and dimensions, and the right frame shows the air mixing ratio (%). The experiment was performed with the floss inlet a of the floss processing apparatus having a diameter of 200 mm, the reducer (defoaming chamber) inlet b having a diameter of 200 mm, and the reducer outlet c having a diameter of 150 mm. Therefore, the cross-sectional area in the reducer is reduced to about 56%.

As a result, the air mixing capacity ratio (%) at the floss inlet a was 97.2%, and the air mixing capacity ratio (%) at the reducer outlet c was 62.2%. Therefore, assuming that the volume of the floss in a is 100, the volume of the liquid mixed with air in c is 7.4, which means that the volume of the liquid has shrunk to 1 / 13.5.

It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified without departing from the gist of the present invention. For example, the floss outlet tube may be a straight tube or a bent tube. Also,
The shape of the floater need not be the one shown in FIG.

[0015]

According to the floss processing apparatus of the present invention described above, since the reducer is provided in the middle of the floss outlet pipe connected to the outlet of the closed pressurized type floatator, when the floss passes through the floss outlet pipe, It has excellent effects such as facilitating foam breakage of floss in the floss outflow pipe and facilitating handling in the floss post-treatment step.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a floss processing apparatus of the present invention.

FIG. 2 is a sectional view of the upper part of the hermetically pressurized type floatator of FIG. 1;

FIG. 3 is a partial sectional view of the floss outlet pipe of FIG. 1;

FIG. 4 is a diagram showing a change in the amount of air mixed in a closed pressurized flotator floss.

FIG. 5 is a schematic view of a conventional deinking flotation apparatus.

FIG. 6 is a cross-sectional view of a deinking flotation apparatus disclosed in Japanese Patent Application Laid-Open No. 3-130483.

[Explanation of symbols]

 15 Closed pressurized type floatator 16 Floss collection pipe 16a Opening 16b Floss inflow member 17 Floss outflow pipe 17a Large diameter pipe 17b Reducer 17c Small diameter pipe 19 Storage tank 20 Air 21 Liquid

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4D037 AA12 AB02 AB06 BA06 BA07 4D051 AA04 AB03 DC14 DD07 4L055 AA11 AC09 BA16 CA37 FA22 GA35

Claims (1)

[Claims] 1. A floss processing apparatus characterized in that a reducer for reducing the diameter of a floss outlet pipe connected to a floss outlet of a closed pressurized type floatator is provided.