JPS5910157Y2 - Arrangement structure of press paper roll - Google Patents

Description

[Detailed Description of the Invention] The arrangement structure of a conventional press paper roll will be explained with reference to FIGS. 1 to 3. First, FIG. 1 shows the case of a twin bar press.

In FIG. 1, the wet paper 2 peeled off from point A of the center roll 1 travels through the space until it is supported by the paper roll 3 at point B, and is attached to the felt 4 of the subsequent press at point C of the paper roll 3. The air between the wet paper paper 2 and the felt 4 is squeezed out by the paper roll 3 to prevent so-called blowing from occurring in the subsequent press.

However, this type of paper has disadvantages in that the distance between A and B is long, which tends to cause paper breakage, and the position of point A and C moves in the circumferential direction of the center roll, resulting in dry stability.

FIG. 2 shows a configuration in which a paper roll 5 is added in order to shorten the point A-B in FIG.

In this case, the stability of the paper travel path between A and B is increased, but the distance traveled through the space is still long, so there is a drawback that paper breaks occur.

Figure 3 shows an example of a transfer twin press, which is a modification of the tri-nip press.
Another conventional arrangement example is shown in which the running distance (open draw) between wet paper sheets is shortened by using a roll 7.

In this case, there are two open draws, one between A=Bl and one between B2 and C. In order to remove the air between the wet paper paper 2 and the felt 4 at point C, the roll 6 must be a suction roll or a structured roll. By pressing the wet paper paper 2 onto the felt 4 using the tension of the wet paper paper 2, blowing in the subsequent press is prevented.

However, in this method, the roll 7 is moved to the position indicated by the dotted line during the paper threading operation, but the paper cannot be threaded unless the wet paper 2 is properly blown with air to the nip point formed by the felt 4 at point D. ``This method requires more skill than the one shown in FIG. 2, and the roll 7 needs to be driven by a motor (the same applies to the roll 5 in FIG. 2).

Moreover, if the roll 6 is a suction roll, the cost will increase and a vacuum source will be required, which will go against energy consumption.

The present invention was proposed to eliminate the above-mentioned conventional drawbacks, and aims to provide an energy-saving press paper roll arrangement structure that is low cost, free from blowing concerns, and has good operability. .

The embodiment of the present invention will be explained below with reference to the drawings. First, in FIG. Being pushed.

In addition, 9a is also a roll for felt support, but it may be provided as necessary, by providing grooves on the surface or by using it as a suction roll, so that the wet paper 2 floats up from the felt 4 at the lap part with the felt 4. This is to prevent it from happening.

This is an air jet provided only in the part through which a narrow wet paper (tail) passes when paper is passed through the paper.

Further, the distance between the center roll 1 and the paper roll 8 is narrowed, and the paper roll 8 and the felt 4 are installed so as to form a nip at the point C'.

Further, grooves are provided on the surface of the paper roll 8 to prevent blowing between the wet paper paper 2 and the paper roll 8 at point C due to air brought in between the wet paper paper 2 and the paper roll 8. You can also do it.

Reference numeral 11 denotes a doctor, and the felt roll 9 is installed at a position so that the wet paper scraped off by the doctor 11 rides on the felt roll 9, and there is no problem in dropping the paper, and the wet paper is scraped off by the doctor 11. The doctor 11, the center roll 1, the paper roll 8, and the felt roll 9 must form a space large enough to allow paper passing between part A of the doctor 11 and the tip of the doctor 11.

For this purpose, the diameter of the paper roll 8 needs to be larger than the felt roll 9, and at least 400φ or more.

Next, to explain the operation, the wet paper 2 that has adhered to the surface of the center roll 1 and has progressed is torn off at point A using the tension of the wet paper, and at point B' the surface of the paper roll 8 is peeled off. be in contact with

Furthermore, the wet paper 2 advances along the surface of the paper roll 8, and C
It is pressed against the felt 4 at point ', and thereafter enters the nip of the subsequent press along the felt 4.

Also, when paper is being passed through the tail, the tail is C'
An air jet 10 is blown in advance so as not to proceed along the surface of the paper roll 8 even after passing the point, and the paper passing operation is performed, and the air jet 10 is stopped after the paper passing is completed.

Note that the method explained above can also be applied to binip presses and inverse presses, and these examples will be described in the sixth example.
As shown in FIG.

Further, FIG. 5 shows an embodiment in which the felt support roll 9a in FIG. 4 is not provided.

As explained above, in the present invention, the paper roll is provided close to the press roll, so the open draw is very short, and since there is only one location, there is almost no risk of paper breakage.

Further, the surface of the paper roll is brought into contact with the felt of the subsequent press to form a felt nip, and the air between the wet paper and the felt can be squeezed out, so that the problem of blowing does not occur.

Furthermore, since the diameter of the paper roll is made larger than the diameter of the felt roll, a space for paper passing can be provided.

As described above, according to the present invention, the distance between the peeling point of the wet paper paper from the center roll and the felt nip is short, making it easy to feed the paper, and there is no need for a suction roll in the lead-in section.
Low cost.

Further, since a vacuum source is not required, the device can be energy-saving.Furthermore, since the paper roll is driven by felt, a driving device is not required.

Furthermore, the paper roll operating side moving device (air cylinder type) that was conventionally provided is no longer necessary, and therefore costs can be reduced by reducing the number of parts.

[Brief explanation of the drawing]

Figures 1, 2 and 3 are side views showing the arrangement structure of a conventional press paper roll, and Figures 4, 5, 6 and 7 respectively show an embodiment of the present invention. FIG. 2 is a side view showing the arrangement structure of press paper rolls. Explanation of the main parts of the figure, 1... Center roll,
2...Wet paper, 4...Felt, 8...
...Paper roll, 9...Felt roll.

Claims (1)

[Scope of utility model registration request] In the open draw part of the press section of a paper machine, a paper roll is provided close to the press roll, and the surface of the same paper roll is brought into contact with the felt of a subsequent press to form a felt nip, and the diameter of the paper roll is A press paper roll arrangement structure characterized by having a diameter larger than that of a felt roll.