JPS6039174B2 - Beating degree measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for measuring the freeness of fibers, which is necessary when adjusting papermaking equipment.

For example, it is well known that the degree of freeness in the adjustment section of a paper machine affects its dewatering ability and affects paper quality.

Conventionally, there is a device for measuring freeness as shown in Figs. 1 and 2. This device is designed to open the top cover b of measuring device a and pour 1000 cc of base paper d taken out from the paper machine into beaker c. After this injection, when the cock e is closed, the upper lid b is closed, the lower lid f is opened, and the cock e is opened, the water falls through the wire gauze g.
This falling water is received by the receiving cone h, but the water overflowing from the receiving cone h passes through the passage i and is stored in the measuring cylinder k. It represents. However, with this device, although it is possible to determine the macroscopic degree of roughness, it is not possible to obtain the microscopic one, and furthermore, it takes time to correct the degree of roughness, and it is troublesome because it is all done manually. This device had several defects, and could not be considered a desirable device for automating freeness measurement.

The present invention aims to eliminate the drawbacks of the conventional devices, obtain accurate key tapping degrees, adjust paper machines, etc., and obtain better paper quality. A dilution section that mixes dilution water to dilute the fibers to a predetermined fiber concentration, and a cylinder that receives the diluted solution diluted in the dilution section.A wire mesh is removably provided inside the cylinder, and a pressure is applied to the upper surface below the wire mesh. A freeness measuring section is equipped with a piston member equipped with a detection member and a temperature detection member that can detect the pressure and temperature of water that has been heated with a wire mesh, and a freeness measurement section that automatically transfers the dehydrated sample into a tube together with the wire mesh. It is equipped with a concentration measuring section that measures the water after it has been removed from the body and dried, and the freeness is automatically measured by the pressure detecting section inside the upper cylinder, and the water temperature detected by the temperature detecting member and the concentration measuring section are measured. The present invention is characterized in that temperature and density correction can be performed based on the calculated density value.

Hereinafter, the freeness measuring device of the present invention will be explained with reference to the drawings.

3 to 5 show an example of the measuring device of the present invention, and this device 1 as a whole extracts a stock solution 3 containing fibers from a raw material pipe 2 and dilutes it to a predetermined fiber concentration. 4
, a measuring section 5 that measures the 00 resolution from this diluted solution, and a concentration measuring section 6 that measures the temperature of the diluted solution and the dry weight of the fibers in order to correct the measured values.

This dilution section 4 supplies the stock solution 3 from the raw material pipe 2 to a valve 7.
A bypass pipe 9 with a valve 10 is connected to the bypass pipe 9, and a branch pipe 11 with a valve 10 is connected to the mixing tank 12.
This tank 12 also has a conduit 15 extending therethrough for guiding a predetermined amount of dilution water introduced from a water supply pipe 13 into a water supply tank 14. The mixing tank 12 is equipped with a hatching machine 16 for mixing the stock solution 3 and dilution water.
is provided to sufficiently mix the stock solution 3 and dilution water to prevent the formation of blocks and precipitation of fibers. The measurement unit 5 includes an upper cylinder 18 that receives a predetermined amount of diluted liquid from the mixing tank 12 when the supply valve 17 is opened, and a pin 21 supported at the lower end of the upper cylinder 18 so as to be bent to one side. The upper section 18 is provided with a ventilation valve 44, and a wire mesh 19 with a ring is placed on the upper part of the lower cylinder 20 so as to be freely removable. A valve 45 is provided, and a piston member 25 having a plurality of pressure sensing members 24 and one temperature sensing member 34 provided on its upper surface as shown in FIG. 5 is inserted from below.

The pressure sensing member 24 and the temperature sensing member 34 are connected to the amplifier 22 via a conductive wire 23, and when the piston member 25 is lowered by the operation of the air cylinder device 26 connected to the piston member 25, the wire mesh 19 is passed through the monkey. When the water dehydrated from the sample is poured onto the piston member 25, its pressure and temperature are measured. The lower end of the piston member 25 is attached with the air cylinder device 26 for actuating the piston member 25, and is adapted to engage with an arc-shaped guide member 29 having a radius centered on the pin 21. By moving the piston member 25 along the guide member 29 by the drive device 28 via, for example, a wire 27, the lower cylinder body 2
The forehead can be moved around the forehead pin 21, and stopped by stoppers 32 and 33 at the end of the forehead movement.
In addition, the concentration measuring section 6 has an arm 37 with a drive device 37, which has a length such that its tip can approach the wire mesh 19 inside the lower cylinder 20 when the lower cylinder 20 is operated so as to expose its upper surface to the outside. Rotating arm mechanism 3 that rotates with
1, an electronic dryer 38 having a lid 41 and attached with a worm jack 40 with a sample table 39 attached to the upper end, and an electric scale 35 provided near the electronic dryer 38. , A trapping ring 30 having the same shape as the wire mesh 19 is attached to the tip of the arm 37, and receives a magnetic force when energized. Inner wire mesh 19
After holding by suction, the sample table 3 in the electronic dryer 38
After drying the sample fibers adhering to the wire mesh 19, the arm 3 is transferred to the measuring device 35.
7 for transfer and weighing.

A wire mesh replenishing device 42 is located near the concentration measuring section 6 .

This wire mesh replenishing device 42 is configured such that a new wire mesh 19 filled in a wire mesh filling cylinder 47 is pressed one by one against the tip of an arm 37 using an air cylinder attachment 43, and is held by a ring 30 at the tip of the arm 37. After the wire mesh 19 with fibers attached is removed from the lower cylinder 20, a new wire mesh 9 can be automatically loosened. Reference numeral 46 denotes a drain port provided in the lower cylindrical body 20'.

Next, the effect will be explained. Stock solution 3 flowing inside raw material pipe 2
is extracted into the mixing tank 12 by opening the valves 7 and 8 of the bypass pipe 9 and the valve 10 of the branch pipe 11, and diluted to a predetermined fiber concentration by supplying water from the water supply pipe 13, and then passed through the thickening machine. 16 to worship the hawk.

After this evacuation, the supply valve 17 is opened and the diluent is introduced into the upper cylinder 18.

In this case, it is assumed that the piston member 25 within the lower cylinder body 20 is maintained at the rising end position. After injecting the diluent, the upper end valve 44 of the upper cylinder 18 and the valve 45 of the lower cylinder 20 are opened and the air cylinder device 26 is operated, and the water falls into the lower cylinder 20 while the fibers are filtered by the wire mesh 19.

If the water pressure P at this time is measured by the pressure detection member 24 as it changes over time, a straight line from o to a shown in Fig. 6 will be obtained, and the slope of this straight line will be the initial dehydration level. Become. Further, when the air cylinder device 26 is operated to lower the piston member 25, the fibers are gradually stacked on the wire mesh 19.
The water level will gradually decrease.

If this is measured in the same manner as described above, a straight line from a to b in FIG. 6 will be obtained, and the slope of this straight line will be the degree of water leakage in the fiber lamination. Note that in FIG. 6, point C indicates the level of dehydration in the cylinder.

Although the degree of freeness measured in this way can be used to determine the degree of freeness, it cannot be used as the true degree of freeness because it does not use the water temperature and fiber concentration as parameters.

Therefore, the following operations are performed automatically. After the dehydration is completed, the drive device 28 is operated to move the lower cylindrical body 20 around the pin 21 to expose the wire mesh 19, while draining water from the drain port 46. Next, the arm 37 is rotated by the operation of the rotary arm mechanism 31 so that its tip is positioned opposite to the exposed wire mesh 19, and the wire mesh 19 is rotated with the urging ring 30.
and move it onto the table 39 of the electronic dryer 38. The wire mesh 1 to which the above-mentioned cloth is attached by this electronic dryer 38
9 is dried, but in this case, it is dried while being exhausted by a ventilation fan (not shown).

This dried sample is held together with the wire mesh at the tip of the arm 37 and placed on a measuring device 35, and the concentration is measured based on the value on the measuring device 35. When the fiber concentration is measured in this way,
The concentration is corrected based on this value, and the temperature of the monkey water is corrected based on the value of the temperature detection section 34, so that the true degree of freeness can be calculated.

After this calculation, the rotating arm mechanism 31 is operated again to set a new wire mesh 19 on the two lower cylinders, and the same measurement is performed again.

In the above embodiment, the arm 37 is rotated, but it may be moved laterally, and the wire mesh 19 is held between the lower cylinder 20 in the state shown in FIG. 4 to dehydrate the fibers. After this dewatering, the fibers may be fed into an electronic dryer 38.

As described above, according to the present invention, an undiluted solution containing fibers is diluted to a predetermined fiber concentration, and this water is allowed to flow through a wire mesh while being cured, and the pressure of this water is electrically detected by a pressure detection section. Therefore, it is possible to measure the water content during initial dehydration and the water content during fiber lamination separately, and therefore the freeness can be evaluated separately during initial dehydration and dehydration during lamination. That is, 0 of the paper stock in the stock solution
Not only can the zero solubility be known immediately, but also the length of the fibers contained in the stock solution can be determined by the length of time it takes for the pressure P to reach point a.

In addition, the work of measuring the freeness of paper stocks can be done automatically, eliminating the troublesome manual work required in the past.Furthermore, this work can be done in an extremely short time.
It can provide good results while ensuring uniform paper quality.
It has extremely excellent effects.

[Brief explanation of drawings]

Figures 1 and 2 are explanatory diagrams of working conditions showing conventional freeness measurement;
FIG. 3 is an overall schematic diagram of the measuring device according to the present invention, FIG. 4 is an overall schematic diagram showing the operating state of the measuring device after measuring water level, and FIG. 5 is a diagram showing the pressure sensing member attached to the piston member. FIG. 6, which is a vertical cross-sectional view showing the temperature detection member, is a graph showing the relationship between water leakage pressure measured by the OP resolution measurement unit and time. 1... Measuring device, 2... Raw material pipe, 3.
...Standard solution, 4...Diluted part, 5...
・Measurement part, 6...Concentration measurement part, 18...Upper cylinder, 19...Wire mesh, 20...Lower cylinder, 24...Pressure Detection member, 25... Piston member, 26... Air cylinder device, 28
... Drive mechanism, 30 ... Reinforcement ring, 31 ... Rotating arm mechanism, 34 ...
Temperature detection member, 35... Measuring instrument, 38...
Electronic dryer, 42... Wire mesh supply device. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] 1. A dilution section that mixes a stock solution containing fibers and dilution water to dilute it to a predetermined fiber concentration, and a cylinder that receives the diluted solution diluted in the dilution section and is removably equipped with a wire mesh inside the cylinder. A piston member with a pressure sensing member and a temperature sensing member on the upper surface is inserted below to detect the pressure and temperature of water filtered through a wire mesh. It is equipped with a concentration measuring section that is automatically removed from the cylindrical body along with the wire mesh and measured after drying, and within the cylindrical body, the degree of beating is automatically measured by a pressure sensing member, and the water temperature and concentration detected by the temperature sensing member are measured. A freeness measuring device characterized in that temperature and concentration can be corrected based on the concentration value measured in the section.