JPS6281563A - Paper stock yield measuring machine - Google Patents

Abstract

PURPOSE:To enhance the reproducibility of the paper layer forming process on the wire part of a paper-making machine, by providing a vibrator for vibrating a paper stock tank and connecting a suction tank to a white water tank. CONSTITUTION:A paper stock preliminarily prepared is introduced into a paper stock tank 1 and stirred by a paper stock stirrer 11 to be dispersed. At the same time, minute vibration is applied to the stock material by a vibrator 6 to generate micro-turbulence and the paper stock is held to a dynamic state. Next, a suction apparatus 13 is operated to open a vacuum cock 14 to start sucking. Succeedingly, the cock 7 provided to the tube 8 connecting a white liquor receiving tray 3 and a while water tank 9 to drop the stock material and a paper layer is formed on a wire 2 while the white water fallen through the wire 2 is stored in the white water tank 9 to be subjected to the measurement of a filler. The obtained paper layer is transferred to filter paper and pressed and dried to obtain a paper sheet which is, in turn, used as a sample for various tests.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper stock yield measuring device. In particular, by controlling the action amplitude of the shaker, the reproducibility of the paper layer formation process on the wire part of the paper machine is high, and it is more effective in predicting the filler yield. It is an object of the present invention to provide a multi-functional paper stock yield measuring machine capable of predicting the general strength of actual paper.

Conventionally, a test machine for forming paper sheets using paper stock consisting of pulp fibers, fillers, internal sizing agents, paper strength enhancers, etc.
ppi method (Tappi T2O5m-53) or based on this? , = JIS method (, OS p8209)
However, these methods are filter paper sheet forming test machines under static conditions, and the yield values of the paper stock obtained and the physical property values of the paper sheets do not match those of the paper machine. have

Recently, -W has been used as a paper stock yield identification device that skillfully reproduces the dynamic conditions under which hydraulic shear forces act.

@Dy by Br mouth (TappL 56.410)
Br1tt's measuring machine, for which the ``namic drainage jar'' was developed, is equipped with a variable rotary blade in the stirring tank to apply shear force to the paper stock.
[on (Yield in the process of dewatering one-pass retin-sheen paper stock on the wire of a paper machine to form a paper layer.Hereinafter abbreviated as ropRJ) so that it is equal to the value,
By controlling the rotational speed, the OPR on the paper machine for various paper stocks can be predicted.

However, although the Br1tt measuring machine is certainly effective for breaking flocs in paper stocks due to hydraulic shear forces, it is particularly effective for stirring directly on the wire, especially when using hardwood pulp as the main raw material. In case of clogging on the wire,
It has the disadvantage that it is difficult to predict the OPR value of an actual paper machine because of the risk of errors due to stock splash. In other words, the Br1tt measuring machine does not take into account the t-ro microturbierence generated by the vertical vibration of the wire and the filtration process that passes through the paper layer formed on the wire, and only the shearing force caused by the rotating blades. However, the process of forming a paper layer on a wire has not been reproduced yet.

The present invention eliminates the drawbacks of the conventional method described above, and develops a testing machine that has high reproducibility in the process of forming a paper layer on the wire part of a paper machine, and is capable of predicting filler yield and the general strength of actual paper. As a result of extensive research, we have completed the present invention.

That is, the present invention provides a paper stock yield measuring machine comprising a paper stock tank in which a white water receiver is provided with a tray and a wire detachably, a paper stock stirrer, and a white water tank. This paper stock yield measuring device is characterized in that a suction device is connected to the white water tank.

Hereinafter, technical matters of the present invention will be explained in detail.

The paper stock yield measuring device of the present invention includes a paper stock tank, a paper stock stirrer,
The main parts are a white water tank and a shaker.

First, a paper stock tank 1 is provided with a wire 2 that can be attached and detached, and a tray 6 for collecting white water passing through the wire 2 is provided at the bottom of the paper stock tank 1. The wire 2 can be replaced not only with a commercially available bronze wire but also with the same wire as the plastic wire, double wire wire, etc. used in paper machines.

The stock tank 1 provided with the wire 2 and the white water tray 3 is connected to a shaker 6 equipped with a variable amplitude dial 5 via a stock tank stand 4 having a support.

The white water receiving tray 3 is connected to a white water tank 9 by a chive 8 equipped with a cock 7, and a white water sampling cock 10 is attached to the white water tank 9.

Further, a suction device 15 is connected to the white water tank 9 via a blowing tool 14.

The shaker 6 applies slight vibrations to the paper stock on the wire in order to generate micro-turbidity, which is important in the process of forming a paper layer on the wire part. Normally, in 50 cycles, the vibration is 3000 times/min. For 60 cycles, 360
0 times/min is common. The amplitude is preferably between 05 and 3fi, although it is not limited, and can be set with the amplitude variable dial 5.

The suction device 15 is effective in better reproducing the paper layer formation process on the wire part. And paper stock tank 1
The stock is sufficiently agitated and dispersed by the stock agitator 11 to prevent the formation of flocs. This paper stock stirrer 1
1 is a variable speed type that does not limit the number of revolutions, but can set the number of revolutions to match the actual paper machine, and has a maximum of 15
00 rpm is sufficient.

To test using the paper stock yield measuring device of the present invention, the pre-prepared paper stock is placed in a paper stock tank, and then stirred with a stock agitator to meet the conditions of the actual paper machine. to disperse the stock. At the same time, a shaker applies slight vibrations to the paper stock to generate microturbation and maintain it in a dynamic state. Next, activate the suction device, open the vacquième cock, and draw suction. Next, the white water receiver opens the cock installed in the chive that connects the tray and the white water tank, allowing the paper stock to fall and form a paper layer on the wire, and the white water that has passed through the wire and fallen is retained in the white water tank. , fillers, etc.

When obtaining paper sheets using the paper stock yield measurement device of the present invention, after stirring the paper stock in the paper stock tank for a predetermined period of time, the rotation speed of the stirrer is lowered to an extent that no flocs occur. Set the vibration amplitude of the shaker to a large value to vibrate the wire for a predetermined period of time, then drop the paper stock to form a paper layer on the wire. The obtained paper layer can be transferred to F paper or felt, pressed, and dried as in the Tappi method or JIS method to obtain paper leaves, which can be used as samples for various tests. Be it.

As seen in the examples, the paper stock yield measuring device of the present invention matches the data of the actual paper machine extremely well, and better reproduces the paper waste formation process on the wire part of the actual paper machine. It turns out that it is an extremely useful measuring device.Next, an example using the paper stock yield measuring device of the present invention will be shown.

Example 1゜Blend composition Part by weight: Raw material 300F with the above-mentioned blend composition for an actual paper machine was collected,
Paper stock prepared to a concentration of just over 0.7 was placed in a paper stock tank and stirred with a paper stock stirrer at a rotational speed of 70 Orpm, and at the same time, vibration with an amplitude of 1.5 u was applied using a shaker, and paper was made by suctioning with a suction device. .

On the other hand, for comparison, the rotation speed of the paper stock agitator was 7.
Paper was made by simply stirring at 0.00 rpm. In addition, actual paper produced using a real paper machine was collected for comparison.

One bath: 1 tensine (0, P, R%) was determined from the ash content of the actual paper and the obtained paper strips and the ash content of white water.

Example 2 Compounding composition Part by weight The one-pass retin sheen was determined in the same manner as in Example t using the above-mentioned blending composition.

Example 1. - The one-pass retin scenes determined by Z are shown in Table 1, and it can be seen that the paper stock yield measurement device of the present invention and the real-root paper machine are in good agreement and reproducible.

g1 table one pass richin scene (chi)

[Brief explanation of drawings]

The drawing is a schematic diagram of the paper stock yield tester of the present invention.

Claims (1)

[Claims] In a paper stock yield measuring machine comprising a paper stock tank in which a white water receiving tray and a wire are detachably provided, a paper stock stirrer, and a white water tank, a shaker is provided to vibrate the paper stock tank,
Furthermore, a paper stock yield measuring device characterized in that a suction device is connected to the white water tank.