JPS6163793A - Twin wire apparatus of papermaking machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a fin and wire device for a paper machine, and particularly to a wire part for making high-quality paper, in which a paper stock layer undergoing dehydration is sandwiched between two wires. This paper relates to a paper whose quality is uniform and whose texture is not disturbed during dehydration.

In conventional paper machines, paper stock is fed through slits in the head box to wires in a wire bar, where it is made into paper, mechanically dehydrated in a press part, and then transferred to a dry part. The most common method is to dry it with heat and wind it on a reel through a calendar roll. During this time, the paper stock containing 99% water becomes paper containing, for example, 10% or less water.

By the way, some paper machines carry out the above wire part process.
After pressing the wire with foils spaced apart in the longitudinal direction and moving the whole wire in a wavy manner, a vacuum foil,
A structure in which the material is passed over a vacuum box and finally guided to a couch roll is also used. In wire barts with this structure, the paper stock forms a paper stock layer where the surface layer is mostly made up of suspended water, and this layer is dehydrated by gravity as the wire moves, and is subsequently dehydrated by suction from the underside of the wire, so the wire side The amount of water removed from the paper stock layer on the surface side is small compared to the dehydration of the paper stock layer on the surface side. When the paper is wound up on a reel through the subsequent paper-making process such as parting, the paper has two sides, which impairs the uniformity of the paper quality and causes various problems in processing and use.

Therefore, a fin wire device was developed in which another wire was placed in the middle of the wire bar. As shown in FIG. 4, this fin wire device connects the endlessly rotating lower wire 1 in the middle of the wire bar to the fixed foil 3.
3. In the part that is pressed against and moved, an upper wire 5 that rotates endlessly is provided between a part of this fixed foil and the vacuum box 4 from which the above-mentioned vacuum foil is omitted, and this and the lower wire are paired. The purpose is to dehydrate the paper stock layer. That is, the upper wire 5 is passed through a grooved homing roll 6 and a solid homing roll 7.
, the rack is passed alternately up and down to the wire roll 8, and then the rack is passed to the wire stretcher roll 9, the wire roll 10, and the guide roll 12 to make it endlessly rotatable. The upper and lower wires are brought into contact with the upper wire 5 at the groove homing roll 6 and guided to the wire roll 8 via the solid homing roll 7, after which the stock layer is transferred to the lower wire by the transfer roll 13. 1 and led to the couch roll 14 via the vacuum box 4.

According to this device, at the part where the lower wire 1 and the upper wire 5 meet, the paper stock layer in the process of being dewatered by the Groove Homigroll 6 is sandwiched between the upper and lower wires, and white water (white water) is removed from both the upper and lower surfaces by the pressure caused by the tension of the wires. cloudy water) is dehydrated. At this time, the paper stock layer has a small proportion of water in the whole, forming a wet paper, so the water on the upper side of this layer is transferred from the upper side to the lower wire side where it is difficult to be dewatered by gravity alone. Since the water is dehydrated, the dehydration is carried out smoothly. During this dewatering process, the wet paper made from the paper stock layer is transported to the solid homigrol 7 while being sandwiched between the upper and lower wires, where it is further dehydrated in the upward direction.
The white water removed by the two Homigrolls flies due to the kinetic energy given by the running of the upper and lower wires and enters the saveall 15, where the main flow of white water around the Groove Homigroll 6 is captured and the white water is spread around the rolls. The scattered spray white water is captured, and the captured white water is discharged outside the machine by appropriate means. The paper stock layer dehydrated in this way had a solid content of 0.8 to 2.5% at the entrance of the groove homing roll.
10% is transported to 3 to 4 vacuum boxes 4 where it is subsequently dehydrated, further dehydrated by couch rolls and sent to the press part.

In addition, in order to prevent the influence of the wind caused by the flow of white water, an exhaust duct 16 is provided around the groove homing roll, solid homing roll, saveall, and shower device for cleaning the upper wire 5 (not shown). ,
A blower (not shown) is attached to this. 15a is a deflector.

If the structure is configured as shown in FIG. 5 (1) as described above, as shown in FIG. The combination of fluid wedge-type continuous dehydration generated by upper and lower wires around the paper creates a uniform wet paper with a uniform moisture content and a good formation of fibers with good dispersion, and it is different from conventional fourdrinier. Similar high wire yields can also be achieved. As shown in Figure 6, the paper made in this way has less duality due to the difference in dehydration on both the front and back sides due to the dehydration ratio adjusted in the vertical direction, and the paper layer structure in the paper thickness direction is symmetrical. have a sexual nature. Moreover, the vertical dewatering ratio can be adjusted by adjusting the number and angle of foils in brehoming, adjusting the paper stock concentration in the head box, etc.

However, with this type of structure, the wet paper that is sandwiched between two wires and is about to be dehydrated will not be able to absorb water from the surface of the paper, unlike newspapers whose paper layer structure is not very dense. Since there is not a lot of floating water, even if dehydration is performed using these wires, there is little difference in the moisture content between the top and bottom, and there is no disturbance in the formation, but the structure of paper waste such as gravure paper and carbon paper is When dense high-quality paper becomes dense, the structure of the precipitated layer of the paper stock layer formed on the lower wire also becomes relatively dense depending on the type and amount of fibers contained in the paper stock, which reduces its water permeability. As a result, the water in the upper layer is not dehydrated by gravity, and as a result, when the paper stock layer during the dewatering process is sandwiched between the upper and lower wires and dehydrated, it has a lot of floating water on the surface, and this floating water makes it wet. The fibers of the paper are disturbed, resulting in poor texture, and the moisture content on the front and back sides of the paper is different, resulting in non-uniform paper quality. In particular, high-grade papers often contain fillers, so if this filler is mixed with the paper stock and paper is made as described above, the water permeability efficiency is further reduced by the filler, resulting in the above-mentioned This results in an increase in floating water when dewatered by the upper and lower wires, making it difficult to measure the uniformity of the quality of the finished paper and to improve its texture.

Furthermore, as shown in Fig. 4, the grooved homing roll 6, solid homing roll 7, and wire roll 8 have different diameters, and if there is a distance between these rolls, misalignment will occur between the upper and lower running wires. Due to this shift, the paper stock layer during the dewatering process is subjected to shearing force and deforms, so that it may not be possible to obtain a good formation.

Problems to be Solved by the Invention As mentioned above, the conventional fin wire device has a method of sandwiching a paper stock layer during dewatering between two wires to remove floating water on the surface of the paper stock layer during dewatering. As a result, especially when making high-quality paper where there is a large amount of floating water, the moisture content on the front and back sides of the paper may differ and the formation may be disturbed, so improvements are desired. Ta.

Means for Solving the Problems In order to solve the above problems, the present invention provides a lower wire that is sequentially supplied with paper stock and conveys the paper stock while dewatering it;
An upper wire is provided in the middle of the lower wire and conveys the paper material during the dewatering process by sandwiching it between the lower wire and the lower wire, and the upper wire and the lower wire are connected between the upper wire and the lower wire. In a fin wire device for a paper machine that has a plurality of rolls that sandwich the stock in the process and run it in a curved shape, the upper wire and the lower wire sandwich the paper stock in the dewatering process at the meeting point. Provided is a fin and wire device for a paper machine, characterized in that it is provided with a shoe that presses the wire to squeeze water from the paper stock in the dewatering process, and is also provided with a guide/discharge means for guiding and discharging the squeezed water. It is something to do.

Further, the present invention provides a method for transporting the paper stock during the dewatering process between a lower wire that is sequentially supplied with paper stock and conveys the paper stock while dewatering it, and a lower wire that is provided oppositely in the middle of the lower wire. A paper making machine comprising: an upper wire that pinches and conveys the stock while dewatering; and three rolls that run the paper stock in an S-shape while sandwiching the paper stock in the dewatering process between the upper wire and the lower wire. In the fin wire device, a shoe is provided for squeezing water from the paper stock during the dewatering process by pressing these wires against a meeting portion where the upper wire and the lower wire sandwich the paper stock during the dewatering process, and the squeezing shoe is provided. A guiding/discharging means for guiding and discharging the discharged water is provided, and the first roll and the second roll of the three rolls are arranged so that the upper and lower wires between these rolls are at an angle of 25 to 45 degrees with respect to the horizontal plane.
The present invention provides a fin wire device for a paper machine, characterized in that the fin wire device is set at a position at an angle of 100 degrees, and a third roll is placed close to the second roll.

Function: With the above structure, floating water in the paper stock layer during the dewatering process, which is sandwiched between two wires, is removed by the shoe and the guiding/discharging means, so that the dispersion state of the fibers is not disturbed.
The moisture content on both sides of the finished paper can also be made uniform. In addition, if the arrangement of the rolls, which run two wires with the paper material layer in the dewatering process sandwiched between them, is configured as described above, the upper and lower wires will not be excessively misaligned, and the dispersion state of the fibers will be disturbed. Never.

Next, one embodiment of the present invention will be described based on FIGS. 1 and 3.

The same reference numerals as those in the figures indicate the same components, and the upper wire 5 is expanded to reach the groove homing roll 6 via the wire roll 21, and the wire roll 21 and the groove homing roll 6, a shoe 22 and a pre-save oar 23 as a guide/discharge means are provided. These shoes 22 and presave oars 23 are shown in detail in FIG. That is, the shoe 22 consists of a front shoe 22a and a rear shoe 22b, and the upper and lower wires 1.5 are pressed upwardly by the front shoe 22a with the paper stock layer in the dewatering process sandwiched therebetween, and these wires 1.5 is pressed downward by the rear shoe 22b, and the paper stock layer in the dewatering process is pressed by the tension of the two wires, and the white water is squeezed out. In addition,
The angle of the edges of the front shoe and the rear shoe can be adjusted, and by adjusting the angle, the amount of bite into the upper and lower wires 1 and 5 can be changed, so that the amount of water squeezed can be adjusted within a range of several tens of percent. On the other hand, the pre-save all 23 includes a water storage box 23a, a white water inlet 23b facing the rear end of the horizontally elongated front shoe 22a extending over the entire width of the wire 1.5, and a white water inlet 23b that is continuous with the white water inlet 23b and slopes diagonally upward. A white water introduction path 23c is provided at its upper end facing and communicating with the water storage box 23a, and a white water introduction cover 23d is provided at the upper edge of the white water introduction port 23b so as to cover the upper part in front of the front shoe 22a. is rotatably provided, and the space between it and the upper wire 5 can be adjusted by a connecting rod 23f whose length can be freely adjusted by a turnbuckle 23e provided between the water storage box 7 box 23a. It has become. And the above rear shoe 2
The front end of the white water inlet 2b is brought into contact with the lower edge of the white water inlet 23b, and the white water squeezed out by the front shoe 22a and the rear shoe 22b is generated by the kinetic energy accompanying the running of the upper and lower wires 1.5. The white water flows from the white water inlet 23b through the white water inlet path 23c and flows down into the water storage box 23a. This white water is collected in a water storage box and then drained by appropriate means. Note that a ventilation pipe 23g and a fan 23h are provided in the upper space of the water storage box 23a.

Further, as shown in FIG. 4, the grooved homing roll 6 and the solid homing roll 7 are formed to have the same diameter, and the positions of these rolls are at the angle that the upper and lower wires 1.5 running between these rolls make with the horizontal plane. α is 45 degrees or less25
It is set to be more than 100%. Further, a wire roll 8 is provided as close as possible after the solid homing roll 7, so that misalignment between the upper and lower wires can be reduced. By adjusting α and the position of the wire roll in this manner, the deviation between the upper wire 5 and the lower wire 1 during running does not become excessive, so that the formation of the stock layer during the dewatering process can be prevented from being disturbed. When the above α is larger than 45 degrees, the length of the upper and lower wires held by the grooved homing roll and the solid homing roll becomes long, and the paper quantity layer is suddenly dehydrated and becomes excessively dehydrated and becomes too clumped. The dispersion state of the fibers also deteriorates,
Conversely, when α is smaller than 25 degrees, the dewatering efficiency of the paper stock layer during the dewatering process by the upper and lower wires becomes poor, and as a result of too much water, the state of fiber dispersion also deteriorates.

Next, the operation of this embodiment will be explained.

In the wire bart constructed as described above, paper stock is sequentially supplied to the lower wire 1, where it is dehydrated by gravity, and is sandwiched from above by the upper wire 5 as shown in FIG. The white water is squeezed out by being pressed by the rear shoe 22b. This squeezed white water reaches the pre-save all 23 due to the kinetic energy caused by the running of the upper and lower wires, where it is delivered to the white water inlet 23b.
The white water flows out through the white water introduction path 23c into the water storage box 23a, where it is temporarily retained and then discharged. On the other hand, the paper stock layer during the dewatering process remains sandwiched between the upper and lower wires 1.5, and the grooved homing roll 6 and the solid homing roll 7
The salt water flows through the wire rolls 8 and 8 and reaches the transfer roll 13, where the upper and lower wires l,
When the paper stock layer 5 is separated, the paper stock layer in the dewatering process is transferred to the lower wire 1 side, further salted in a drying box 4 and couch roll 14, and conveyed to a press part. In this process, the paper stock layer undergoing dewatering is sandwiched between the upper and lower wires to dehydrate the white water, and this white water flows out to the saveall 15 by the kinetic energy accompanying the running of the upper and lower wires. At this time, a portion of the remaining white water pressed and squeezed out by the grooved homing roll 6 is retained in, for example, concentric grooves provided on the circumferential surface of the grooved homing roll 6, and further, due to the centrifugal force of this roll. He was blown away and spilled into Save All 15.

In this way, the paper stock layer in the brine process is dehydrated, and the dehydration process is shown in FIG. Here, dewatering is performed in the pre-save all 23 (the upper dewatering amount is made to correspond to the decrease in the upper dewatering amount in the wedge-shaped continuous dehydration in the next step, for example). Floating water can be effectively removed from those for which the dehydration efficiency cannot be maintained at a high level even if gravity dewatering is performed while pressing the parts with foil. At this time, by adjusting the angle of the shoe 22, the amount of water removed can be adjusted within a range of several tens of percent.

When dewatering is performed in this manner, the dispersion state of the fibers in the paper stock layer during the dewatering process is not disturbed, so that the formation is not disturbed. In addition, the grooved homing roll, solid homing roll, and wire roll are arranged so that the upper and lower wires do not shift excessively when they run, thereby more reliably preventing this formation disturbance. I can do it.

Furthermore, as a result of effective dewatering in the upward direction, the moisture content on the front and back surfaces of the finished paper can be made uniform, and the quality of the paper can also be made uniform.

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, the paper stock layer during the dewatering process is held between the upper and lower wires, and the white water of the paper stock layer during the brine process, which is held between the upper and lower wires, is drained between the rolls before being dewatered. The wire is squeezed out by pressing it with a shoe,
Since this squeezed white water is discharged by the drainage means, even when the water permeability of the paper stock layer during the brine process is poor and there is a large amount of floating water, such as when making high-quality paper, this floating water can be removed. Since the paper stock layer during the dewatering process is sandwiched between the upper and lower wires and dewatered through the rolls, the dispersion state of the fibers is disturbed and the formation deteriorates. In addition, by effectively dewatering upward, the water content on the front and back surfaces of the finished paper can be made uniform, and the quality of the paper can be made uniform. These effects, especially the effect of not worsening the formation, can be more reliably prevented by sandwiching the paper stock layer during the dewatering process between the upper and lower wires and optimizing the position of these rolls when dewatering the paper through the rolls.

The paper made in this way not only has no duality like paper made with a conventional fin-wire machine, but also has a good primary wire yield (after all, paper made with a conventional fin-wire machine) This means that on top of the characteristics of the paper, the properties of high-quality paper such as good texture and uniform paper quality are added.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of an apparatus according to an embodiment of the present invention, FIG. 2 is a schematic explanatory diagram of its main parts, FIG. 3 is a diagram showing a dehydration chart of the apparatus of FIG. 1, and FIG. 1 is a schematic explanatory diagram of a conventional device corresponding to FIG. 5, and FIG. 5 is a diagram showing its dehydration chart.
FIG. 6 is a diagram showing the upper and lower dewatering ratios in the wire of the apparatus of FIG. 4. In the figure, 1 is a lower wire, 5 is an upper wire, 6 is a grooved homing roll, 7 is a solid homing roll,
8 is a wire roll, 22 is a shoe, and 23 is a pre-save all as a guide/discharge means. September 3, 1985 (N Procedure Nefu Seisho (spontaneous) June 10, 1986

Claims (2)

[Claims] (1) The paper stock in the dewatering process is held between a lower wire that is sequentially supplied with paper stock and conveys the paper stock while dewatering it, and a lower wire that is provided oppositely in the middle of this lower wire. In a fin wire device for a paper machine, the fin wire device has an upper wire that is conveyed while being dehydrated, and a plurality of rolls that run the upper wire and the lower wire in a curved manner while holding the paper stock in the dewatering process between them. A shoe is provided for squeezing water from the paper stock by pressing these wires against a meeting part where the paper stock during the dehydration process is held between the upper wire and the lower wire, and also guiding and discharging the squeezed water. Paper machine fins and fins that are characterized by being equipped with a means for conducting and draining water.
wire device. (2) The paper stock in the dewatering process is held between a lower wire that is sequentially supplied with paper stock and conveys the paper stock while dewatering it, and a lower wire that is provided oppositely in the middle of this lower wire. A fin wire for a paper machine having an upper wire that is conveyed while being dehydrated, and three rolls that run the upper wire and the lower wire in a substantially S-shape with the paper material being dehydrated sandwiched between them. In the apparatus, a shoe is provided which squeezes water from the paper stock during the dewatering process by pressing these wires against a meeting part where the paper stock during the dewatering process is held between the upper wire and the lower wire. A guide and drain means for guiding and discharging water is provided, and the first roll and second roll of the three rolls are arranged so that the upper and lower wires between these rolls are at an angle of 25 degrees to 45 degrees with respect to the horizontal plane. A fin for a paper machine, characterized in that the fin is set at a position where
wire device.