JPH11140785A - Papermaking machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve transferring performance of wet paper to a press part and improve press performance in the press part in a papermaking machine. SOLUTION: In a papermaking machine 10 having a press part 31 for interposing a wet paper A transferred from a carrying belt 12 between a bottom felt 32 and a top felt 33 and dehydrating the wet paper, an endless pick up wire 21 is arranged between the carrying belt 12 and the bottom felt 32. The pickup wire 21 is arranged in a state overlapped to wet paper discharge zone of the carrying belt 12 and wet paper sucking apparatuses 28 and 43 are arranged on the inside to the wet paper discharging zone of the pickup wire 21 and the pickup wire 21 is arranged in a state overlapped with the wet paper introducing zone of the bottom felt 32 of the press part 21 and the wet paper sucking apparatus 28 and 43 are arranged on the inside to the wet paper introducing zone of the bottom felt 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a paper machine, and more particularly to a paper machine having an improved press part.

[0002]

2. Description of the Related Art As shown in FIG. 5, a conventional paper machine is provided with a first press part 2, a second press part 3, and a dryer part 4 on the exit side of a transport wire 1 for transporting a wet paper web A. .

At this time, the first press part 2 includes a bottom felt 5 and a top felt 6, and sandwiches the wet paper A transferred from the transport wire 1 between the bottom felt 5 and the top felt 6, and The wet paper web A and the felts 5 and 6 are pressed by the inner press roll 5A and the inner press roll 6A of the top felt 6, and the dewatered water is retained by the felts 5 and 6 to rotate around the wet paper web A. It is going to be taken out from.

In the first press part 2, the top felt 6 is arranged so as to overlap the wet paper web discharge zone of the transport wire 1 in order to transport the wet paper web A from the transport wire 1 to the first press part 2. A suction pickup roll 7 is arranged inside the top felt 6 with respect to the wet paper web discharge zone. The suction pickup roll 7 applies a vacuum suction force to the wet paper web A on the transport wire 1 from the inside of the top felt 6 so that the wet paper web A can be picked up from the transport wire 1 to the top felt 6.

[0005]

However, in the prior art, the single top felt 6 of the first press part 2 has both the function of picking up the wet paper A and the function of pressing the wet paper A. I have. The pick-up function of the wet paper web A requires the felt to have high air permeability, and the press function of the wet paper web A requires the felt to have a high water retention and transport property with respect to the dewatered water. There are great difficulties.

[0006] When the performance of the top felt 6 is biased to the press performance, there is a possibility that the paper may run out due to the deterioration of the pick-up function, which hinders the improvement of the paper making speed.

[0007] When the performance of the top felt 6 is deviated from the pickup performance, the press performance is deteriorated, thereby deteriorating the dewatering efficiency, increasing the load on the dryer part, and in this case, also hindering the improvement of the paper making speed.

An object of the present invention is to improve the performance of transferring a wet paper to a press part in a paper machine and to improve the press performance in the press part.

[0009]

According to a first aspect of the present invention, there is provided a transport belt for transporting a wet paper web, a bottom felt and a top felt, and the wet paper transported from the transport belt is a bottom felt and a top felt. In a paper machine having a press part that sandwiches and dewaters between the end, an endless orbital pickup wire is interposed between the transport band and the bottom felt of the press part, and the pickup wire is connected to the transport band. A wet paper suction device is disposed inside the pickup wire with respect to the wet paper discharge zone, and the pickup wire is disposed so as to overlap with a wet paper introduction zone of the bottom felt of the press part. A wet paper suction device is disposed inside the bottom felt with respect to the wet paper web introduction zone.

According to the first aspect of the present invention, the following:
Has the effect of By using a pick-up wire as a means for picking up the wet paper A from the transport zone to the press part, and using a bottom felt and a top felt as a press means for the wet paper A in the press part, the pick-up means and the press means for the wet paper A Were separated from each other.

The pick-up wire is provided with a wet paper suction device on the inside, so that the performance of picking up the wet paper A from the transport belt to the press part can be easily improved. For this reason, there is no fear of running out of paper, and the papermaking speed can be improved.

The top felt is not involved in picking up the wet paper web A, and it is not necessary to take the pick-up function into account at all. In addition, the bottom felt only accepts the wet paper web A transported by the pickup wire to the upper surface of the felt overlapping the pickup wire, and since the felt surface is originally denser than the pickup wire, a special pickup function is considered. No need to put in. That is, the quality of the bottom felt and the top felt can be selected by taking into account only the press function without considering the pickup function, and the press performance for the wet paper web A can be improved. For this reason, the water removal efficiency can be improved.

[0013]

1 is a schematic diagram showing a first embodiment, FIG. 2 is a schematic diagram showing a second embodiment, FIG. 3 is a schematic diagram showing a third embodiment, and FIG. 4 is a fourth embodiment. A schematic diagram showing
FIG. 5 is a schematic diagram showing a conventional example.

(First Embodiment) (FIG. 1) A paper machine 10 includes a pickup wire 21 and a first press part 3 on the exit side of a wire part 11 for transporting a wet paper web A.
1, a second press part 51 and a dryer part 61 are provided.

(Wire Part 11) Wire Part 11
Winds the transport wire 12 having an endless circumference around the suction couch roll 13, and transports the wet paper web A by the transport wire 12. The wet paper web A (not shown) is supplied to the transport wire 12 from a head box (not shown), or transferred and supplied from another transport wire upstream. Transport wire 12
Can be replaced with a transport felt. Transport wire 1
2 is suitable for transporting one or two layers of wet paper web A, and the transport felt is suitable for transporting two or more wet paper webs A. In addition, the wire part 11 can be accompanied by a top wire 14 on the transport wire 12, and the presence of the top wire 14 can eliminate or reduce the difference between the front and back of the wet paper web A.

(Pickup Wire 21) The pickup wire 21 is composed of the transport wire 12 and the first press part 31.
Between the bottom felt 32 and the bottom felt 32. The pickup wire 21 includes a guide roll 22, a stretch roll 23, a lead-in roll 24, and two touch rolls 2.
5, 26, wound around the return roll 27 to form an endless orbit.

The pick-up wire 21 is disposed between the lead-in roll 24 and the touch roll 25 so as to overlap the wet paper web discharge zone of the transport wire 12 so as to be able to contact the wet paper A on the transport wire 12. At the same time, a wet paper suction device 28 is arranged inside. Wet paper suction device 2
Numeral 8 is a pickup box which performs a vacuum suction operation. The vacuum suction force is applied to the wet paper A on the transport wire 12 via the pickup wire 21 at the suction zone exit of the suction couch roll 13 (for example, immediately after the end of the suction zone). , And the wet paper web A is peeled off from the transport wire 12 and picked up on the pickup wire 21 side.

The pickup wire 21 additionally includes a shower 29A and a suction pipe 29B. The shower 29A and the suction pipe 29B face each other with the pickup wire 21 interposed therebetween, and clean the pickup wire 21.

The pickup wire 21 is connected to the suction couch roll 13 in the wet paper web discharge zone of the transport wire 12.
Around, it is pressed against the wet paper A on the transport wire 12 and is driven synchronously with the traveling of the transport wire 12, so that a driving force for the pickup wire 21 is not necessarily required.

(First Press Part 31) The first press part 31 includes a bottom felt 32 and a top felt 33. The bottom felt 32 includes a felt roll 34,
It is wound around a guide roll 35 and a stretch roll 36 to form an endless orbit. The top felt 33 includes a felt roll 37, a guide roll 38, and a stretch roll 3.
9 and form an endless orbit. The first press part 31 dewaters the wet paper web A transferred from the transport wire 12 via the pickup wire 21 by sandwiching the wet web web A between the bottom felt 32 and the top felt 33. That is, the bottom felt 32 and the top felt 33 are provided with a grooved press roll 40 and a suction press roll 41 inside thereof.
Is dewatered by sandwiching the wet paper web A in the press dewatering zone in which is disposed. The top felt 33 is the suction tube 4
2 is additionally provided.

The pickup wire 21 is
Between the touch roll 25 and the touch roll 26, the wet paper web A on the pickup wire 21 can be brought into contact with the bottom felt 32 while being arranged so as to overlap with the wet paper web introduction zone of the bottom felt 32. A wet paper suction device 43 is arranged inside the wet paper introduction zone. The wet paper suction device 43 is composed of a transfer box that performs a vacuum suction operation, and transfers the wet paper A on the pickup wire 21 to the bottom felt 32.

(Second Press Part 51) The second press part 51 has a felt 52 for receiving the wet paper A depressurized and depressed in the first press part 31 via a press / pickup plain roll 44 and a paper roll 45. . The felt 52 is wound around a felt roll 53, a guide roll 54, and a stretch roll 55, and forms an endless orbit. The felt 52 is dewatered by sandwiching the wet paper A in a press dewatering zone between a plain press roll 56 and a grooved press roll 57 disposed on each side of the felt 52.

(Dryer Part 61) The wet paper A having passed through the second press part 51 is fed to the dryer part 61 through a paper roll 58 and a smoothing roll 59. The dryer part 61 evaporates the residual moisture of the wet paper web A.

Therefore, in the paper machine 10, the transfer of the wet paper web A from the wire part 11 to the press part 31 is performed as follows. (1) The wet paper web A which is transported by the transport wire 12 of the wire part 11 and reaches the wet paper web discharge zone comes into contact with the pickup wire 21 arranged so as to overlap with the transport wire 12 and at the same time as the suction zone of the suction coach roll 13. At the outlet, it is sucked by the wet paper suction device 28 inside the pickup wire 21. As a result, the wet paper A is peeled off from the transport wire 12 and is picked up by the pickup wire 21.

(2) According to the above (1), when the wet paper web A picked up and conveyed by the pickup wire 21 reaches the wet paper web introduction zone of the bottom felt 32 of the press part 31, the wet paper web A is picked up by the pickup wire 21. While being in contact with the bottom felt 32 that is arranged so as to overlap with the bottom felt 32, the suction is performed by the wet paper web suction device 43 inside the bottom felt 32,
It is transferred from the pickup wire 21 to the bottom felt 32.

According to the present embodiment, the following operations are provided. A pickup wire 21 is used as a means for picking up the wet paper A from the transport wire 12 to the press part 31.
By using the bottom felt 32 and the top felt 33 as the press means of the wet paper A in the press part 31, the pick-up means and the press means of the wet paper A are separated and independent from each other.

The pick-up wire 21 is provided with a wet paper suction device 28 on the inner side, so that the performance of picking up the wet paper A from the transport belt to the press part 31 can be easily improved. For this reason, the possibility of running out of paper is reduced.

The top felt 33 is not involved in picking up the wet paper web A, and it is not necessary to take the pick-up function into account at all. Further, the bottom felt 32 only accepts the wet paper web A transferred by the pickup wire 21 to the upper surface of the felt that overlaps the pickup wire 21. Since the felt surface is originally denser than the pickup wire 21, the bottom felt 32 is exceptionally special. There is no need to take into account the pickup function. That is, the bottom felt 32
The material and the like of the top felt 33 can be selected by considering only the press function without considering the pickup function, and the press performance for the wet paper web A can be improved. For this reason, the water removal efficiency can be improved.

Second Embodiment (FIG. 2) The second embodiment is substantially different from the first embodiment in that an inner fab leak wire 45 is provided inside a top felt 33 constituting a first press part 31. That is. The inner fab leak wire 45 is wound around the above-mentioned suction press roll 41 on the inner surface of the top felt 33, and is wound around a guide roll 46, a stretch roll 47, a lead-in roll 48, and a return roll 49 to form an endless orbit. Make The inner fab leak wire 45 additionally includes a shower 45A and a suction pipe 45B.
And the suction pipe 45B are opposed to each other with the inner fab leak wire 45 interposed therebetween.
Wash 5 The inner fab leak wire 45 diffuses the vacuum suction effect of the suction press roll 41 on the wet paper web A.

(Third Embodiment) (FIG. 3) The third embodiment is substantially different from the second embodiment in that a wet paper suction device 28 provided on the inner surface of the pickup wire 21 is provided.
Is replaced by a wet paper suction device 28A including a suction pickup roll. Of the wet paper suction device 28A,
At the suction zone exit of the suction coach roll 13 (for example, immediately after the end of the suction zone), a vacuum suction force is applied to the wet paper A on the transport wire 12 via the pickup wire 12 to peel the wet paper A from the transport wire 12. To the pickup wire 21 side.

(Fourth Embodiment) (FIG. 4) The fourth embodiment is substantially different from the first to third embodiments in that the wire part 11 has an endless orbital shape for conveying wet paper A. The only difference is that the transport wire 12 is wound around the suction coach roll 13 and the return roll 13A. And pick-up wire 2
Numeral 1 denotes an arrangement in which a wet paper web discharge zone between the suction couching roll 13 and the return roll 13A of the transport wire 12 overlaps, and a wet paper suction device 28 (28A) is arranged inside the pickup wire 21 with respect to the wet paper web discharge zone. It is.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific structure of the present invention is not limited to this embodiment, and the design can be changed without departing from the scope of the present invention. The present invention is also included in the present invention.

[0033]

As described above, according to the present invention, in a paper machine, the transfer performance of a wet paper to a press part can be improved, and the press performance in the press part can also be improved.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a first embodiment.

FIG. 2 is a schematic diagram showing a second embodiment.

FIG. 3 is a schematic diagram showing a third embodiment.

FIG. 4 is a schematic diagram showing a fourth embodiment.

FIG. 5 is a schematic view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Paper machine 11 Wire part 12 Conveying wire (conveying band) 21 Pickup wire 28, 28A wet paper suction device 31 press part 32 bottom felt 33 top felt 43 wet paper suction device

Claims (1)

[Claims] 1. A transport belt for transporting wet paper, a press part including a bottom felt and a top felt, and a press part for dewatering wet paper transported from the transport belt between the bottom felt and the top felt. In the paper machine, an endless orbital pickup wire is interposed between the transport band and the bottom felt of the press part, and the pickup wire is arranged so as to overlap the wet paper web discharge zone of the transport band. A wet paper suction device is disposed inside the wet paper web discharge zone, and the pickup wire is disposed so as to overlap the wet paper web introduction zone of the bottom felt of the press part, and inside the bottom felt with respect to the wet paper web introduction zone. A paper machine comprising a wet paper suction device.