JP3513126B2 - Paper forming machine of paper making machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a papermaking apparatus in which a papermaking raw material is discharged from a headbox onto a wire and conveyed by the wire, and is dehydrated by a dehydrator, and then further dehydrated through a suction box. The present invention relates to a paper forming device of a machine.

[0002]

2. Description of the Related Art A conventional example of a paper forming apparatus in which a papermaking raw material is discharged from a headbox onto a forming wire and is conveyed by the wire to be dehydrated to form a wet paper is shown in FIG.
It is shown in. In FIG. 3, 1 is a head box for discharging a papermaking raw material, 2 is a wire, and the wire 2 has an endless structure as shown in the drawing, and a horizontal run portion (for forming a wet paper web on its upper surface). Ford linear table section 3).

Below the wire 2 forming the horizontal run portion 3, a forming board 4, a dehydrating device 5 and a suction box 6 are arranged in order from the left side where the head box 1 is arranged to the right side. . A felt 7 is provided above the suction box 6, and the felt 7 is configured to travel with the wire 2 sandwiched between the felt roll 8 and the pickup roll 9 and the upper surface of the suction box 6. Reference numeral 10 is a frame, and the frame 10 is provided with a saveall 11 for receiving water dewatered from the papermaking raw material on the wire 2. In the figure, 1
A breast roll 2 guides the wire 2 below the head box 1.

The paper forming apparatus shown in FIG. 3 has the above-mentioned structure. The head box 1 discharges the papermaking raw material S to the horizontal run portion 3 of the wire 2 on the forming board 4, and the wire 2 is used. Dehydration is carried out by the transporting and dewatering device 5. The papermaking raw material reaches the suction box 6 as the wire 2 is conveyed, and is sandwiched by the wire 2 and the felt 7. The papermaking raw material is further dehydrated by being subjected to the vacuum force from the suction box 6 and the pressing force by the tension of the felt 7. The mat M is formed. In this way, the wet paper web mat M formed on the wire 2 is transferred by the pickup roll 9 together with the felt 7 to a press part (not shown) which is the next step.

In the conventional paper forming apparatus described above, when the thin paper is made at a high speed (850 m / min or more), the horizontal run portion 3 is relatively long. There was a problem that scattering and the like occurred, which caused problems in the papermaking and made the operation difficult.

[0006]

In view of the above-mentioned problems of the paper forming apparatus in the conventional paper making machine,
An object of the present invention is to provide a paper forming apparatus of a papermaking machine capable of switching to a structure suitable for high-speed thin paper making and thick paper forming.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, a papermaking raw material is discharged from a headbox onto a wire and is conveyed by the wire while being dehydrated by a dehydrator, and then further dehydrated by a suction box. In a paper forming apparatus of a papermaking machine adapted to perform the above, a forming roll having a felt laid over the wire in the vicinity of the head box is arranged so as to be able to move up and down, and during thin papermaking, the forming roll is lowered to move the wire. Form a nip between the felt and the felt ,
Due to the squeezing pressure and centrifugal force generated by tension,
Most of the water in the papermaking raw material discharged from the headbox
To form a wet paper web by dehydrating the
At the same time, when the forming roll is lowered,
The wire pushed down by the forming roll.
The head box and the wire in the same direction as the traveling direction of the yarn.
Providing papermaking machine the paper forming apparatus was <br/> configured to tilt the forming board disposed under the Ya.

According to the paper forming apparatus of the present invention having the above construction, for example, when making thin paper having a weight of 35 g / m ² or less, the forming roll is lowered and pushed into the wire to perform paper making. Therefore, in this state, the papermaking raw material discharged from the headbox onto the wire is immediately sandwiched between the wire and the felt, and most of the water in the papermaking raw material is dehydrated by the squeezing force and centrifugal force due to the wire tension. A wet paper web is formed on. On the other hand, for example, 3
When making thick paper of 5 g / m ² or more, the forming roll is moved upward to form a wet paper web with the same configuration as the conventional apparatus shown in FIG.

As described above, according to the paper forming apparatus of the present invention, when making thin paper, the forming roll is lowered so that the papermaking raw material discharged from the head box onto the wire is immediately sandwiched between the wire and the felt. And
Since the open portion can be shortened to allow papermaking, it is possible to prevent scattering of the papermaking raw material on the wire and to make thin paper at high speed. Further, according to the paper forming apparatus of the present invention, when papermaking thin paper, the papermaking raw material ejected from the head box onto the wire is immediately sandwiched between the forming roll and the wire, and a shear flow is generated in the papermaking raw material. Since the fibers are oriented in the running direction of the wire, soft thin paper can be easily made. Thus, according to the device of the present invention,
Not only thick paper, but also thin paper can be made at high speed.

Further, in the paper forming apparatus according to the present invention
The wire is pushed by the forming roll and the traveling direction of the wire changes, but when the forming roll is lowered, the wire is pushed in the same direction as the traveling direction of the wire pushed down by the forming roll. since the arranged configuration for tilting the forming board, the head box and the forming board that Do and the relative positional relationship between the wire traveling direction is maintained.

Further, in the paper forming apparatus according to another present invention, the wire rolls are arranged to be raised beneath the downstream side of the wire of the forming roll, pushes up the wire to be pushed down by the forming rolls upward in the wire roll Forming roll and lower headbox
Since a structure to maintain the horizontal state of the wire between the breast roll, even when lowering the forming roll, it is possible to maintain the wire between the breast roll and the forming roll in a horizontal state, thin It is not necessary to displace the head box and the forming board between when papermaking and papermaking.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a paper forming apparatus according to the present invention will be specifically described based on the embodiment shown in FIGS. 1 and 2, parts having the same structures as those of the conventional paper forming apparatus shown in FIG. 3 are denoted by the same reference numerals as those shown in FIG. 3, and duplicated description thereof will be omitted. .

(First Embodiment) First, the first embodiment shown in FIG.
A paper forming apparatus according to the embodiment will be described. In FIG. 1, 13 is a forming roll, and this forming roll 13 is arranged so as to be able to move up and down above the wire 2 in the vicinity of the head box 1. The felt 7 on the suction box 6 is extended and stretched around the forming roll 13, and by an appropriate mechanism not shown in FIG.
It is configured to be held in either one of the descending position A and the ascending position B.

No. 14 of the first dehydrating device of the two dehydrating devices 5 is NO. It is a curved blade in which the surface of one blade has a curvature. Further, the head box 1 and the forming board 4 in the paper forming apparatus shown in FIG. 1 are configured to be capable of inclining from a horizontal arrangement position shown by a broken line to a right downward inclined position as shown by a solid line. Head box 1
Since the mechanism for holding and holding the forming board 4 in the horizontal position and the inclined position may be arbitrary, the detailed structure thereof is not shown. The other structure of the paper forming apparatus shown in FIG. 1 is substantially the same as that of the conventional apparatus shown in FIG. 3, and the same reference numerals as those in FIG. 3 are shown, and the description thereof will be omitted.

The paper forming apparatus according to the first embodiment shown in FIG. 1 has the above-mentioned structure. For example, when making thin paper having a weight of 35 g / m ² or less, the forming roll 13 is placed at the position indicated by the solid line. The wire 2 is pushed down by the forming roll 13 so that the wire 2 is pushed in. As a result, the papermaking raw material S discharged from the head box 1 is sandwiched between the felt 7 and the wire 2 which are hung on the forming roll 13 relatively quickly, and the papermaking raw material S is squeezed by the tension of the wire 2 and the centrifugal force. Most of the water inside is dehydrated to form a wet paper web.

As described above, the forming roll 13 is lowered to form thin paper, and the forming roll 13 is formed.
When the wire 2 is pushed in, the head box 1 and the forming board 4 are inclined to follow the state in which the head box 1 and the forming board 4 are inclined downward to the right as shown by the solid line in FIG. Wire 2 that is inclined by pressing board 4 down with forming roll 13
The relative positional relationship with respect to the traveling direction is maintained as in the horizontal state.

The first dehydrating device of the two dehydrating devices 5 has NO. Curved blade 14 which is one blade
Has a curvature on its surface, so that the wire 2, the sheet and the felt 7 traveling on it can smoothly travel. As described above, according to the paper forming apparatus shown in FIG. 1, even if thin paper is made at high speed, it is possible to suppress the occurrence of scattering of the papermaking raw material and stably form high-quality paper.

On the other hand, when making thick paper having a weight of, for example, 35 g / m ² or more, when the forming roll 13 is moved to the lowered position as described above, the papermaking raw material is smoothed in the nip portion between the felt 7 and the wire 2. Forming roll 1
3 is moved to the raised position shown by the broken line in FIG.

At this time, the head box 1 and the forming board 4 are placed in the horizontal position indicated by the broken line so that they are in the same direction as the running direction of the wire 2 near the head box 1. Therefore, during papermaking of thick paper, it is operated as an apparatus for forming wet paper in the same manner as the conventional paper forming apparatus shown in FIG. As described above, the paper forming apparatus according to the first embodiment of FIG. 1 can stably produce high-quality paper from thin paper to thick paper with one machine.

(Second Embodiment) Next, the second embodiment shown in FIG.
A paper forming apparatus according to the embodiment will be described. In FIG. 2, 15 is a wire roll, and this wire roll 15
Is disposed below the wire 2 between the two dewatering devices 5 and is configured to be held in either one of a raised position A'shown by a solid line and a lowered position B'shown by a broken line in FIG. There is. In the paper forming apparatus according to the second embodiment, the head box 1 and the forming board 4 are arranged at horizontal positions as shown in the figure, and are not configured to be tiltable as in the case of the first embodiment. Other configurations are substantially the same as the configuration of the paper forming apparatus according to the first embodiment shown in FIG. 1, and the description thereof will be omitted.

As is clear from the above description, in the paper forming apparatus according to the second embodiment shown in FIG. 2, when the wire is pushed down by lowering the forming roll 13, the traveling direction of the wire 2 and the head box. Instead of inclining the head box 1 and the forming board 4 in order to maintain the relative positional relationship between 1 and the forming board 4, the wire roll 15 is raised and the wire 2 is raised.

When making thin paper with the above-described paper forming apparatus of FIG. 2, the forming roll 13 is lowered to the position A of the solid line in contact with the wire 2, and the wire roll 15 is moved to the raised position A'of the solid line of FIG. By raising the temperature up to, a predetermined wire wrap angle can be obtained for the forming roll 13. As described above, in the second embodiment, the wire 2 between the breast roll 12 and the forming roll 13 is maintained in a horizontal state even when the forming roll 13 is lowered, so that the head box 1 and the forming board 4 are displaced. You don't need to.

In the second embodiment, for the reasons described above, it is not necessary to provide the curved blade 14 in the dehydrating device 5 as in the case of the paper forming apparatus of the first embodiment.

Further, when making thick paper with the paper forming apparatus according to the second embodiment, the wire roll 15 is lowered to the descending position B'in the broken line in FIG. 2 until the wire 2 has a horizontal traveling direction. The wire roll 15 may be used as a table roll, or may be configured to be lowered to a position away from the wire 2.

In the paper forming apparatus according to the second embodiment, the head box 1 is different from that of the first embodiment.
There is no need for a mechanism for tilting the forming board 4 and the forming board 4 so as to follow the inclination of the wire 2 in the traveling direction with a high degree of installation accuracy, and therefore, no loss time is required for adjusting their positions or changing the connection of the papermaking material piping. There is an advantage.

In the apparatus according to the second embodiment as well, the papermaking raw material S discharged from the head box 1 is sandwiched between the felt 7 and the wire 2 relatively quickly during thin papermaking, so that the papermaking raw material S is produced even at high speed. It is possible to suppress the occurrence of scattering and the like. In addition, the contact between the wire 2 and the dehydrating device 5 and the suction box 6 is minimized during the thin paper making, the required driving force is reduced, and the life of the wire can be extended.

Although the present invention has been specifically described based on the illustrated embodiments, the present invention is not limited to these embodiments, and various modifications can be made within the scope of the present invention shown in the claims. It goes without saying that modifications may be added. For example, in the above-described embodiment, the felt 7 hung on the forming roll 13 is configured by extending the felt on the suction box 6, but the felt hung on the forming roll 13 is made of felt on the suction box. And another independent felt may be configured to run between the other felt and the other roll.

Further, the NO. 1
Although the blade has been described as the curved blade 14, the wire 2, the sheet and the felt 7 need only smoothly run on the blade, and instead of the curved blade 14, a roll may be installed immediately before the dewatering device 5.

[0029]

As described above, according to the present invention, the papermaking raw material is discharged from the headbox onto the wire and is conveyed by the wire while being dehydrated by the dehydrator, and then further dehydrated by the suction box. In the paper forming apparatus of the papermaking machine, the forming roll having felts laid above the wires in the vicinity of the head box is arranged so as to be able to move up and down, and during thin papermaking, the forming rolls are lowered to separate the wire and the felts. Forming a nip
The wire tension in the forming roll section.
Due to the squeezing pressure and centrifugal force generated by
Most of the water in the papermaking material discharged from the machine is dehydrated downward.
The wet paper web is formed by
When the forming roll is lowered,
With the traveling direction of the wire pushed down by the growl
Placed under the headbox and the wire in the same direction
Providing a structure with the papermaking machine the paper forming device for tilting the forming boards.

According to the paper forming apparatus of the present invention having the above construction, when making thin paper, the forming roll is lowered and pushed into the wire to make the paper. In this state, the papermaking raw material discharged onto the wire from the headbox is sandwiched between the wire and felt relatively quickly, and most of the water in the papermaking raw material is dehydrated by the squeezing force and centrifugal force due to the wire tension. A wet paper web is formed on.

As described above, according to the paper forming apparatus of the present invention, when making thin paper, the forming roll is lowered so that the papermaking raw material discharged from the headbox onto the wire is immediately sandwiched between the wire and the felt. And
The scattering of the papermaking raw material on the wire is prevented, making it possible to fabricate thin paper at high speed.At the same time, a shear flow is generated in the papermaking raw material, and the fibers are oriented in the running direction of the wire, creating a soft thin paper. It can be easily made. Thus, according to the apparatus of the present invention, thin paper can be made at high speed. On the other hand, when making thick paper, the forming roll is moved upward to form a wet paper with the same configuration as that of the conventional apparatus.

In the paper forming apparatus according to the present invention,
Is configured to incline the head box and the forming board disposed under the wire so that when the forming roll is lowered, the wire is pushed down by the forming roll in the same traveling direction .
In the head box and the forming board Ru is maintained relative positional relationship between the wire traveling direction.

Further, in the paper forming apparatus according to another present invention, the wire rolls are arranged to be raised beneath the downstream side of the wire of the forming roll, push the wire pushed down by the forming rolls upward in the wire roll Forming roll and the lower part of the head box
Since a structure to maintain the horizontal state of the wire between the breast roll, even when lowering the forming roll, it is possible to maintain the wire between the breast roll and the forming roll in a horizontal state, the thin paper It is not necessary to displace the head box and the forming board between the papermaking and the papermaking.

[Brief description of drawings]

FIG. 1 is a side view showing a configuration of a paper forming apparatus according to a first embodiment of the present invention.

FIG. 2 is a side view showing the configuration of the paper forming apparatus according to the second embodiment of the present invention.

FIG. 3 is a side view showing the configuration of a conventional paper forming apparatus.

[Explanation of symbols]

1 head box 2 wires 3 Horizontal run part 4 forming board 5 dehydration equipment 6 suction box 7 felt 8 felt rolls 9 pickup rolls 10 frames 11 Save All 12 Breastrolls 13 Forming roll 14 curved blade 15 wire roll

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) D21F 9/02

Claims (2)

(57) [Claims] 1. A paper forming apparatus for a papermaking machine, comprising: discharging a papermaking raw material from a headbox onto a wire and carrying the wire to perform dehydration with a dehydrator, and then further dehydrating with a suction box, A forming roll having felts laid over the wire in the vicinity of the head box is arranged so as to be able to move up and down, and when forming thin paper, the forming roll is lowered to form a nip between the wire and the felt , and the forming roll portion is formed. And
By squeezing pressure and centrifugal force generated by ear tension
A large amount of water in the papermaking raw material discharged from the head box
It is configured to form wet paper by dehydrating the part downward.
And the forming roll was lowered.
The pressing roll pressed down by the forming roll.
In the same direction as the traveling direction of the wire, the head box and the
Forming board placed under the wire and tilted
A paper forming apparatus for a paper manufacturing machine, which is configured to be configured to be. 2. A papermaking raw material is fed from a headbox onto a wire.
Dewatering is performed by the dewatering device while being discharged to
Let it be dehydrated further in the suction box
In the paper forming apparatus of the papermaking machine
The felt over the wire near the box.
The arming roll is arranged so that it can be raised and lowered.
Place the warming roll near the horizontal wire or near the wire.
Position causes lowered to that, the wire rolls are arranged to be raised beneath the wire downstream of the forming roll, the wire pushes up the front Symbol wire upward
To form a nip between the felt and the felt,
Squeezing pressure generated by wire tension in the groll section
And papermaking ejected from the headbox by centrifugal force
Wet paper is formed by dehydrating most of the water in the raw material downward.
The wire and the wire
Ming rolls and breast rolls below the headbox
It is characterized in that it is configured to maintain a horizontal state between
That made paper machine of paper forming apparatus.