JP3524873B2 - Press felt for paper machine and press machine for paper 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 press felt for a paper machine and a press machine for a paper machine, which are used for dewatering wet paper in a press part of a paper machine.

[0002]

2. Description of the Related Art A paper machine is provided with a paper machine press device (hereinafter, also simply referred to as a press device) for dehydrating a web (wet paper) formed by a paper layer forming device while pressing it in a press part. Therefore, dehydration is performed by applying a pressing force to the wet paper through this pressing device.

For example, FIG. 5 is a schematic diagram showing a configuration example of a conventional press part for a paper machine. As shown in FIG. 5, a wet paper web (paper web) sent from a wire part W on the paper layer forming apparatus side.
1 is introduced to the press part side via the suction pickup roll 2 and is transferred to the first press P1 by the pickup felt 3. This first press P1
It is configured as a double felt press in which the wet paper web 1 is passed between the first press (groove roll) 6a and the suction press roll 5 via the pickup felt 3 and the bottom felt 4, and the wet paper web 1 is passed through the felts 3 and 4. Water is squeezed by the nip between the rolls 5 and 6a. Further, the wet paper web 1 is transferred to the No. 2 press P2 by the suction press roll 5, and is squeezed by the nip between the No. 2 press roll (groove roll) 6b and the center roll 6. Further, the wet paper 1 is attached to the surface of the center roll 6 and transferred to the No. 3 press P3, and together with the No. 3 press felt (P3 press felt) 7, the No. 3 press roll (groove roll) 6c and the center roll 6 are nipped. The water is further squeezed by passing through the section.

In this way, the wet paper 1 having a low water content is further treated with a paper roll 9 and a No. 4 press felt 8.
Is transferred to the No. 4 press P4, passes through the nip portion of the No. 4 press roll (groove roll) 6d and the P4 top roll 10, and water is squeezed by the press part. Then, the wet paper web 1 is transferred from the P4 top roll 10 to the next drying step including the dryer cylinder 11 and the like.

The water squeezed from the wet paper web 1 by the press rolls 6a to 6d is pressed felt 3,4,8.
Is absorbed by the batt layer 102 and is removed from the groove portion formed on the outer peripheral surface of each press roll (groove roll) 6a to 6d as shown by the broken line in FIG. Here, the press felts 3, 4, 8 will be described. The press felts 3, 4, 8 have a two-layer structure including a bat layer 102 and a base cloth (base member) 103, as shown in FIG. . The base cloth 103 is formed by knitting fibers such as nylon and polyester, and the batt layer 102 is formed by implanting fibers in the base cloth 103.

[0006]

By the way, when water is squeezed by applying pressure to the press felt with a pair of rolls as in the above-mentioned conventional press part or with a wide shoe press and a roll, water is squeezed under a nip pressure. When the water squeezed from the wet paper to the press felt side moves from the center of the nip to the roll outlet, the pressure drop of the wet paper causes the water to flow back from the press felt side to the web (wet paper) placed on the press felt. (This is called rewetting phenomenon).

The rewetting phenomenon in such a press part will be further described below with reference to FIGS. 7 (A) and 7 (B). Here, as shown in FIG.
While being sandwiched between the press felts 52, 52, the blanket 5 of the groove roll 51 and the shoe press 54.
It is pressed between 3 and water is squeezed. Wet paper 1 and press felt 52 by groove roll 51 and shoe press 54
As shown in FIG. 7A, the pressing force (water squeezing pressure) P against the pressure increases from the nip entrance X ₁ and sharply decreases at the nip exit X ₂ .

In FIG. 7B, the wet paper 1 is squeezed by the squeeze pressure P at the nip entrance X ₁ as shown by an arrow A1.
The squeezed water is temporarily held by the press felt 52 under the nip pressure between X ₁ and X ₂ . However, the wet paper 1 and the press felt 52 are suddenly released from the pressed state after passing the nip outlet X ₂ , and the wet paper 1 and the press felt 52 both expand in volume. During this volume expansion process, air enters the press felt 52 from one surface 52A, so that the water is pushed out by this air so that the water is drawn by the arrow A2.
As indicated by, the rewetting phenomenon occurs from the other surface 52B of the press felt 52 to the wet paper 1 made of fine fibers due to the capillary phenomenon.

Due to such a rewetting phenomenon, the water squeezing performance of the press part deteriorates, and in extreme cases, the wet paper 1
On the contrary, it may even absorb water by passing through the groove roll 51 and the shoe press 53. Therefore, it is preferable that the wet paper having passed through the nip portion is immediately separated from the press felt before the rewetting phenomenon occurs. Therefore, for example, in the press part shown in FIG. 5 described above, one side or both sides of the press felt are separated from the wet paper 1 immediately downstream of the nip portion of the rolls 6a to 6d, as shown in the figure. It is configured.

However, in such a structure, the wet paper 1 may become unstable in the unsupported space (open draw) in which the wet paper 1 is not supported by the press felt, and the paper may be broken. However, there is a problem that the transport speed of 1 and thus the operating speed of the paper machine cannot be increased. Further, Japanese Patent Laid-Open No. 2000-273786 discloses a press felt capable of suppressing the rewetting phenomenon.
In this technique, in a press felt body composed of a base member composed of a plurality of base cloths and a bat layer laminated on the base member, the base cloth constituting the base member is closest to the wet paper placement surface. The second base cloth arranged next to the first base cloth arranged at the position next to the first base cloth has a structure having a higher density and a lower air permeability than the first base cloth. The transfer of water from the base cloth to the first base cloth is regulated to suppress the rewetting phenomenon.

However, even in this technique, it is not possible to completely suppress the infiltration of air into the first base cloth and the second base cloth, and it cannot be said that the rewetting phenomenon can be sufficiently suppressed. The present invention was devised in view of such problems, and provides a press felt for a paper machine and a press device for a paper machine, which can prevent the re-wetting phenomenon and thus realize high-speed operation of the paper machine. The purpose is to

[0012]

Therefore, the papermaking press felt of the present invention according to claim 1 is for conveying wet paper in a press part of a paper machine and absorbing water squeezed from the wet paper. in paper machine press felt for use in a base over scan member, it is configured to include a batt layer laminated on one surface of the base member, the base member, the two
A layer of base fabric and the above two layers of base fabric are intercalated and knitted into fibers.
And a gas impermeable layer formed by melting
It is characterized in that that.

A papermaking press felt according to a second aspect of the present invention is the papermaking press felt according to the first aspect, wherein the impermeable layer is provided on the other surface of the base member rather than the one surface. The feature is that they are arranged close to each other. The papermaking press felt of the present invention according to claim 3 is the papermaking press felt according to claim 1 or 2, wherein the two layers of the base cloth are each made of a predetermined material.
Weaving is formed by weaving, and the impermeable layer is knitted with fibers of the same material.
It is characterized by being formed by melting a sheet material
It

According to a fourth aspect of the present invention, there is provided a press unit for a paper machine, which is provided in a press part of a paper machine, has one or more pressing means, and sandwiches a wet paper web with two press felts for a paper machine. In a press machine for a paper machine having a double felt press that presses the wet paper by the pressing means to squeeze water from the wet paper, a press felt for two paper machines that forms the double felt press described above. At least one of the press felts for paper machines is claimed in any one of claims 1 to 3.
The press felt for a paper machine according to any one of 1. above is used.

According to a fifth aspect of the present invention, there is provided a papermaking press apparatus according to the fourth aspect, wherein the press means is provided in two or more stages, and the second and subsequent stages of the press means are pressed. In the means, the press felt for a paper machine according to any one of claims 1 to 3 is used. According to a sixth aspect of the present invention, there is provided a papermaking press apparatus according to the fifth aspect, wherein at least one of the pressing means is provided with a shoe press.

The papermaking press of the present invention according to claim 7 is a papermaking press which is provided in a press part of a papermaking machine and squeezes water from a wet paper. It is characterized in that the described press felt for paper machines is used.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. First, a paper machine press felt (hereinafter, also simply referred to as press felt) and a paper machine press device (hereinafter, simply referred to as press device) as a first embodiment of the present invention will be described. 1 to 2
[Fig. 2] is a view showing a press felt and a press device of the present embodiment, Fig. 1 is a schematic side view showing a structure of the press felt, and Fig. 2 is a schematic side view showing a structure of the press device. The same reference numerals are given to the members already described in the prior art, and the description thereof will be omitted.

The pressing device 50, as shown in FIG.
It is provided in the press part P for paper machines, and the first press (press means) P1 and the second press (press means) P
It is configured with two. The web (wet paper) 1 dehydrated and formed by the wire part (paper layer forming device) W is sucked and held by the suction pickup roll 2 from the wire part W to the lower surface of the pickup felt 3. After that, the wet paper 1 is sandwiched between the top felt (pickup felt) 3 and the bottom felt 4, and is a first press (press means) including a groove roll (first press roll) 6a and a shoe press 13a. P1
And is pressed by the first press P1 to squeeze water.

The wet paper web 1 is squeezed by the No. 1 press P1, and then is sucked by the suction rolls 14a, 14b to a No. 2 press P2 including a groove roll (No. 2 press roll) 6b and a shoe press 13b. It is transferred, pressed by this No. 2 press P2 and squeezed water, and then
It is adapted to be transferred to the next drying step D. By the way, the first press P1 is configured as a double felt press in which the pickup felt 3 and the bottom felt 4 are interposed between the groove roll 6a and the shoe press 13a, and similarly, the second press P2 is the groove press. It is configured as a double felt press in which the P2 top felt 7a and the P2 bottom felt 12 are interposed between the roll 6b and the shoe press 13b.

Each press felt 3, 4, 7a, 12 is
Each endless belt is wound around a plurality of rolls, and a batt layer described later is set in the press part P so as to come into contact with the wet paper web 1 to be conveyed. Here, the press felts 3, 4 and P of the first press P1
The 2 top felt 7a is formed of the conventional press felt shown in FIG. That is, the press felts 3, 4, and 7 a have a two-layer structure including the batt layer 102 and the base fabric 103.

The P2 bottom felt 12 is shown in FIG.
As shown in FIG. 3, the press felt is used as the first embodiment of the present invention. That, P2 bottom felt 12, batt layer 1 and the base over scan member 12b, the fibers on one surface S2 of the base member 12b is formed by flocking
2a, and the base member 12b is provided with a base cloth 12c, a base cloth 12e, and an impermeable layer 12d that is interposed between the base cloths 12c and 12e and is impermeable to gas. .

Here, the average thickness t _c of the base cloth 12c is set to be larger than the average thickness t _{e of} the base cloth 12e, and the impermeable layer 12d between the base cloths 12c and 12e is formed on the base member 12b. It is arranged at a position closer to the other surface S3 than the one surface S2. The water squeezed from the wet paper 1 on the outer surface S1 of the batt layer 12a in the No. 2 press P2 is also absorbed by the base member 12b via the batt layer 12a, but a material having impermeable property is generally used. Is impermeable to water, and therefore, water squeezed from the wet paper web 1 is blocked by the impermeable layer 12d and does not enter the base cloth 12e.

Therefore, from the viewpoint of water squeezing, the base cloth 12e
It is preferable to reduce the thickness t _e of the gas impermeable layer 12d, that is, to bring the impermeable layer 12d as close as possible to the other surface S3 of the base member 12b so that the impermeable layer 12d extends along the surface S3 of the base member 12b ( That is, it is most preferable that the outer surface S3 is formed. However, the surface S3 is easily worn because it comes into contact with the rolls 6b. Therefore, in the present embodiment, as shown in FIG. Roll 1 layer 12d
3a and 14a are not brought into contact with each other.

The base fabrics 12c and 12e are formed by knitting fibers such as nylon and polyester, similar to the base fabric of the conventional press felt. Further, the impermeable layer 1
2d may be gas impermeable, and is manufactured, for example, by knitting fibers such as nylon and polyester into a sheet and melting the sheet.
That is, it can be manufactured by simply melting the conventionally used base cloth.

Further, in the press device 50 of this embodiment,
In this way, press felt that can suppress the rewetting phenomenon is
Since it is used as the bottom felt 12, the wet paper 1 is passed through the No. 2 press P2 and then the P2 bottom felt 12
There is no need to separate it from the double felt press, and the wet paper 1 can be supported by being sandwiched between the press felts 7a and 12. Therefore, the wet paper web 1 does not have an open draw that is not supported by the press felt.

In the pressing device 50 of this embodiment,
The press felt 12 is used only for the No. 2 press P2, which is the wet paper web 1 pressed by the No. 1 press P1.
Still contains a large amount of water, and therefore, in the press felt of No. 1 press P1, the amount of water transferred from the wet paper 1 is larger than the amount of water that can be absorbed, resulting in an excessive water state. This is because the influence of the rewetting phenomenon itself is small. Since the press felt 12 as the first embodiment of the present invention is configured as described above, the impermeable layer 12d provided on the base member 12b of the press felt 12 causes the press felt 12 described above as a problem of the prior art. The wet phenomenon can be suppressed.

That is, as explained as a problem of the prior art, the pressing force applied to the wet paper web 1 is rapidly reduced at the nip outlet, whereby the press state between the nip inlet and the nip outlet is rapidly released and the press felt is pressed. 12 causes a significant volume expansion, but in the present device, the impermeable layer 12d provided in the vicinity of the surface S3 prevents the press felt 1 from forming.
It is possible to prevent air from invading from the surface S3 due to the expansion of 2.

As a result, the wet paper 1 side (the batt layer 12a, the base cloth 12) of the impermeable layer 12d of the press felt 12 is formed.
A negative pressure is generated in c), and it is possible to prevent the water absorbed by the press felt 12 from returning to the wet paper web 1 (rewetting phenomenon) due to this negative pressure. Therefore, due to the impermeable layer 12d provided on the base member 12b,
There is an advantage that the re-wetting phenomenon at the outlet of the numbering press P2 can be prevented and the water squeezing performance of the pressing device 50 can be improved.

Further, by using the press felt 12 having such a rewetting phenomenon suppressing effect, the wet paper 1 and the press felt 12 are separated on the downstream side of the No. 2 press P2 in order to suppress the rewetting phenomenon. This makes it possible to convey the wet paper web 1 in a stable state (double felt) in which the wet paper web 1 is sandwiched by felts from both sides by the press device 50. Therefore, the transfer speed of the wet paper web 1 and thus the high speed of the paper machine can be increased. There is an advantage that driving can be realized.

Further, since the press felt 12 having the impermeable layer 12d is used in combination with a shoe press having a high nip pressure and a high water squeezing performance, the water squeezing performance of the shoe press can be sufficiently exhibited. There are advantages. Next, a press device as a second embodiment of the present invention will be described. FIG. 3 is a schematic side view showing the configuration of a pressing device according to the second embodiment of the present invention. The members already described in the related art and the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 3, the present press device 50 'is provided with a press part P for a paper machine, and has a first press (press means) P1 and a second press (press means).
P2 and No. 3 press (press means) P3 are provided. In this pressing device 50 ', the wet paper web 1 formed of the wire part W is sucked and held by the suction pickup roll 2 on the lower surface of the pickup felt 3. After that, the wet paper web 1 is sandwiched between the press felts 3 and 4, and is transferred to the first press P1 including the groove roll 6a and the suction roll 5, and is pressed and squeezed. There is.

Then, the wet paper web 1 is sent out by the suction roll 5, sandwiched by the felts 3, 4 and conveyed, and is conveyed to the second press P2 comprising the groove roll 6b and the solid roll 10a. And wet paper 1
Is P2 as one embodiment of the press felt of the present invention.
The top felt 12 'and the bottom felt 4 shared by the first press P1 and the second press P2 are conveyed while being sandwiched by the double felt, and are pressed by the second press P2 to squeeze water.

The wet paper web 1 is further transferred to a No. 3 press P3 comprising a groove roll (No. 3 press roll) 6c and a solid roll 10b, and is pressed together with the P3 press felt 7b by the No. 3 press P3 to squeeze water. After that, it is conveyed to the drying process D including the dryer cylinders 11a and 11b. Here, the press felts 3, 4, 7b, 12 'will be described. The press felts 3, 4, 7b are made of the conventional press felt shown in FIG. 6, and are composed of the batt layer 102 and the base fabric 103. It has a layered structure.

The P2 top felt 12 'is a press felt having an impermeable layer as an embodiment of the present invention, and is constructed as shown in FIG. 1 like the press felt 12 of the first embodiment. ing. That is, the P2 top felt 12 'includes the base fabrics 12c and 12e and the impermeable layer 1
The base member 12b having 2d and the bat layer 12a formed on one surface S1 of the base member 12b are provided.

The pressing device 50 'according to the second embodiment of the present invention.
Uses a press felt 12 ′ having an impermeable layer 12d as the P2 top felt and suppressing rewetting, so that the wet paper 1 is conveyed by the double felt like the pressing device 50 of the first embodiment. It is possible to realize high speed operation of the paper machine. In the above-described second embodiment, the first press P1 and the second press P
In Fig. 2, the press felt 4 is used as a common bottom felt, but it is more preferable that each press P1 and P2 has a bottom felt individually.

Next, a pressing device as a third embodiment of the present invention will be described. FIG. 4 is a schematic side view showing the configuration of a pressing device according to the third embodiment of the present invention.
The members already described in the related art and the above-described embodiments are designated by the same reference numerals, and the description thereof will be omitted.
As shown in FIG. 4, the present press device 50 ″ is provided in a press part P for a paper machine, and has a first press (press means) P1, a second press (press means) P2 and a third press (press means). ) P3. In the press device 50 ″, the wet paper web 1 formed by the wire part W is formed by the suction pickup roll 2 on the lower surface of the pickup felt 3 which is the top felt shared by the presses P1 and P2. It is conveyed while being adsorbed and held, and rolls 5 and 6a by the double felt of press felts 3 and 4.
Is transferred to the No. 1 press P1 and squeezed water.

Then, the wet paper web 1 is sent out by the suction roll 5, is sandwiched by the pickup felt 3 and the P2 bottom felt 12 ″, and is transferred to the second press P2 comprising the rolls 6b, 10a, and the press felt 3,
12 ″ is pressed (double felt press) to squeeze water. Further, the wet paper web 1 is transferred together with the P3 press felt 7c to the third press P3 including the solid roll 10b and the groove roll 6c, and squeezed. After being watered, a drying process D including a dryer cylinder 11 and the like
To be transported to.

Here, the press felts 3, 4, 7c, 1
2 ″ will be explained. Press felt 3, 4, 7c
Consists of the conventional press felt shown in FIG.
Further, the P2 bottom felt 12 ″ is a press felt as one embodiment of the present invention having an impermeable layer, and is configured as shown in FIG. 1 like the press felts 12 and 12 ′ of the above-described embodiments. That is, the P2 bottom felt 12 ″ includes the base fabrics 12c and 12e and the impermeable layer 1
The base member 12b having 2d and the bat layer 12a are provided.

The pressing device 50 ″ according to the third embodiment of the present invention.
Uses the press felt 12 ″ having the impermeable layer 12d and suppressing rewetting as described above as the P2 bottom felt, the wet paper 1 is sandwiched between the press felts 3 and 12 ″ in the second press P2. Therefore, the wet paper web 1 can be conveyed, and the high speed operation of the paper machine can be realized.

In the third embodiment described above, the press felt 3 is used in the first press P1 and the second press P2.
Is a common top felt, but each press P1,
A configuration in which the top felt is individually provided at P2 is more preferable. Further, the press felt and the press device of the present embodiment are not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the description.

For example, in the above-mentioned embodiment, the impermeable layer 12d is interposed between the base fabrics 12c and 12d as shown in FIG. 1, but it is hard to wear even if it comes into contact with a roll or shoe press. If the impermeable layer 12d is made of a material having high wear resistance, the surface (the surface contacting the roll or shoe press) S3 of the base member 12b may be formed by the impermeable layer 12d. (The impermeable layer 12d is covered by the surface S
3 may be provided).

In the pressing device 50 'of the second embodiment shown in FIG. 3 and the pressing device 50 "of the third embodiment shown in FIG. 4, the P3 press felts 7b and 7c are shown in FIG.
Since it is composed of the conventional press felt shown in FIG. 3, the wet paper 1 and the press felts 7b and 7c are separated from each other at the nip outlet of the third press P3 in order to prevent the rewetting phenomenon. Therefore, the nip outlet is an open draw in which the wet paper 1 is not supported at all, but the P3 press felts 7b and 7c are connected to the impermeable layer 12d as shown in FIG.
It is also possible to adopt a configuration having the above, whereby it is possible to eliminate or reduce such an open draw.

Although a plurality of pressing means are provided in each of the above-mentioned embodiments, the number of pressing means may be one. Further, in each of the above-described embodiments, the press device 50,
In 50 ′ and 50 ″, a press felt having a gas impermeable layer (press felt of the present invention) is used for only one part of the press felt, but the press devices 50, 5
It is also possible to use a press felt having an impermeable layer in all the press felts equipped with 0 ′ and 50 ″ respectively.

[0044]

As described above in detail, according to the press felt for a papermaking machine of the present invention according to claim 1, also rapidly expanded is released from pressing by the press means, the non-permeability layer, it is possible to prevent air will be entering immersion, it can be advantageously prevented rewetting due to immersion entry of such air. Furthermore, an impermeable layer is interposed between the two layers of base fabric.
Therefore, it is formed by melting a sheet material woven of fibers.
There is an advantage that abrasion of the impermeable layer can be suppressed.

According to the papermaking press felt of the second aspect of the present invention, the impermeable layer is disposed closer to the other surface of the base member than to the other surface thereof. The layer between the air layer and one surface of the base member (that is, the layer capable of absorbing moisture) becomes relatively thick, and the moisture absorbed from the wet paper via the batt layer can be sufficiently retained by the base member. There is an advantage that the water squeezing performance can be improved.

According to the press felt for a paper machine of the present invention as defined in claim 3 , each of the above-mentioned two layers of base cloth has a predetermined thickness.
It is formed by knitting the fibers of the material, and the impermeable layer is a fiber of the same material.
Since it is formed by melting a sheet-like material woven of fiber,
The impermeable layer simply melts the traditionally used base fabric
It is possible to manufacture just by According to the paper machine pressing apparatus of the present invention as set forth in claim 4, rewetting can be suppressed in at least one of the paper machine press felts forming the double felt press. Since the press felt for a paper machine according to any one of Items 1 to 3 is used, the wet paper and the press felt for a paper machine can be separated from each other at the outlet of the press means for the purpose of preventing the rewetting phenomenon. There is an advantage that the wet paper can be conveyed in a stable state in which the wet paper and the press felt for the paper machine are brought into contact with each other, and high-speed operation of the paper machine can be realized. In addition, the paper machine press
In a sfeld, an impermeable layer is interposed between two layers of base fabric.
Therefore, there is an advantage that abrasion of the impermeable layer can be suppressed.
It

According to the fifth aspect of the paper machine pressing apparatus of the present invention, when the pressing means is provided in two or more stages, the effect of suppressing the rewetting phenomenon can be effectively achieved among these pressing means. Since the press felt for a paper machine according to any one of claims 1 to 3 is used in the second and subsequent pressing means that can be exerted, the water squeezing performance can be efficiently improved. There is an advantage. Claim 6
According to the press machine for a paper machine of the present invention described, the press felt for a paper machine according to any one of claims 1 to 3 is used together with a shoe press having a high water squeezing effect. It has the advantage that water can be effectively squeezed.

According to the paper machine pressing apparatus of the present invention described in claim 7, the press felt for paper machine according to any one of claims 1 to 3 which can suppress the rewetting phenomenon is used. It is not necessary to separate the wet paper from the press felt for the paper machine at the outlet of the press means for the purpose of preventing the re-wetting phenomenon, and therefore, the wet paper and the press felt for the paper machine are kept in contact with each other in a stable state. There is an advantage that the paper can be conveyed and the paper machine can also operate at high speed. Furthermore, in press felt for paper machines, impermeable
The layers are interleaved between two layers of base fabric, so the fibers are woven
Suppresses abrasion of the impermeable layer formed by melting the sheet material
There is an advantage to control.

[Brief description of drawings]

FIG. 1 is a schematic side view showing a configuration of a press felt for a paper machine as a first embodiment of the present invention.

FIG. 2 is a schematic side view showing the configuration of a paper machine pressing apparatus according to the first embodiment of the present invention.

FIG. 3 is a schematic side view showing a configuration of a paper machine pressing apparatus according to a second embodiment of the present invention.

FIG. 4 is a schematic side view showing the configuration of a paper machine pressing apparatus as a third embodiment of the present invention.

FIG. 5 is a schematic side view showing a configuration of a conventional press machine for a paper machine.

FIG. 6 is a schematic side view showing a configuration of a conventional press felt for a paper machine.

FIG. 7 is a diagram for explaining a rewetting phenomenon in a conventional press felt for a paper machine, and (A) is a schematic diagram showing a correlation between water squeezing pressure P and wet paper / felt position X;
(B) is a schematic side view showing an enlarged main part of the press machine.

[Explanation of symbols]

1 Wet paper (paper web) 2 Suction pickup roll 3 Pickup felt 4 Bottom felt 5 Suction roll 6 Solid rolls 6a, 6b, 6c Groove roll (press roll) 7a P2 Top felt 7b P3 Press felt 10a, 10b Solid roll 11, 11a , 11b Dryer cylinder 12 P2 bottom felt (press felt for paper machine) 12 'P2 top felt (press felt for paper machine) 12 ″ P2 bottom felt (press felt for paper machine) 12a Butt layer 12b Base members 12c, 12e Base cloth 12d Impermeable layer 13a, 13b Shoe press 14a, 14b Suction roll 50, 50 ', 50 "Press machine 102 for paper machine 102 Batt layer 103 Base cloth P1 No. 1 press (press means) P2 No. 2 press (pre Means) P3 No. 3 press (press means) W wire part D drying step S2 one surface S3 other surface

Continuation of the front page (56) Reference JP-A-61-252389 (JP, A) JP-A-59-64455 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) D21F 3 / 00-3/10 D21F 7/08

Claims (7)

(57) [Claims] 1. A paper machine paper machine press felt to be used for a press part absorbs squeezed moisture from the transport and the wet web of wet paper, the base over scan member, of the base member And a bat layer laminated on one surface, wherein the base member is between the two-layer base cloth and the above-mentioned two-layer base cloth.
It is formed by melting a sheet-like material interwoven with and knitting fibers
A press felt for a paper machine, which has an impermeable layer . 2. The paper machine press according to claim 1, wherein the impermeable layer is disposed closer to the other surface than the one surface of the base member. felt. 3. The above-mentioned two-layer base cloth is provided with a predetermined material.
Formed by knitting the fibers of the material, The impermeable layer is made by melting a sheet-like material in which fibers of the same material are woven.
It is formed by
Press felt for paper machines. 4. The press part of a paper machine is equipped with 1
Papermaking machine having the above-mentioned pressing means and having a double felt press for pressing the wet paper web by the pressing means in a state where the wet paper web is sandwiched between two press felts for a paper machine to squeeze water from the wet paper web The press felt for a paper machine according to any one of claims 1 to 3, wherein at least one of the two paper machine press felts forming the double felt press is used as a press felt for a paper machine. A press for a paper machine, characterized in that 5. The press means is provided in two or more stages, and the press felt for a paper machine according to any one of claims 1 to 3 is used in the second and subsequent stages of the press means. The press machine for a paper machine according to claim 4, wherein 6. At least one of the pressing means comprises a shoe press.
The press device for a paper machine according to claim 4 or 5. 7. A press for a paper machine, which is provided in a press part of a paper machine and squeezes water from a wet paper, wherein the press felt for a paper machine according to any one of claims 1 to 3 is used. A press machine for a paper machine, which is characterized in that