JP2003293297A - Web coater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a web coater which can uniformly and stably coat a web in a small installation space in improved operation efficiency. <P>SOLUTION: This web coater having coating rolls 130, 131, 230, 231 in response to both the sides of a web 10, respectively, is characterized by disposing air blowout rolls 134, 136, 234 for contactlessly transporting the web 10 treated with the coating rolls 130, 131, 230, 231. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a web coating apparatus for a papermaking machine used for paper pulp.

[0002]

2. Description of the Related Art Generally, a papermaking machine, as shown in FIGS. 5 and 6, has a paper layer forming step A, a dehydrating step B, a drying step C, a coating step D, a drying step E, a smoothing step F, and a winding step. It is composed of each process (equipment) such as G. In the paper layer forming step A, the pulp suspension liquid (fiber + dispersion liquid) is moved by the flow box 1 into two running endless nets 2, 3
In the process of being blown out between the wire roll 4 that supports the wire and the suction roll 5 covered with the net, passing through the dewatering devices 6 and 7, and being sandwiched between the nets 2 and 3, the net 2 ，
The fibers and the dispersion liquid are separated through the mesh of 3, and the remaining fiber component forms the wet web 10. In this process, auxiliary separation may be performed by the suction roll 8 and the suction box 9.

Thereafter, in the dehydration step B, the web 10
Is transferred to the felt 12 by the suction roll 11, and the press roll 1 supporting the two traveling felts 12 and 13
Primary dehydration is performed by pressurizing at 4, 15. Similarly, the secondary dewatering is performed by being pressed by the press rolls 20 and 21 that support the two traveling felts 18 and 19.

Then, in the drying step C, the web 10
Is transferred to the canvas 22a by a suction roll, and while being supported by the plurality of drying rolls 25, suction boxes 27, and suction rolls 26, water is further removed. In the subsequent coating step D, the coating liquid whose uniform thickness is controlled by the supply header is transferred from the surfaces of the coating rolls 30 and 31 to the web 10 and then auxiliary dried in the drying boxes 35a and 35b.

In the next drying step E, the web 10 is transferred to the canvas 22b, passed through the plating (or ceramic) outer cover roll 37, and then the plurality of drying rolls 25, the suction box 27,
While being supported by the suction roll 26, the water is removed and dried. In the subsequent smoothing step F, the web 10 is smoothed by pressing the web surface with the pressure rolls 40 and 41.

Finally, in the winding step G, the web 1
0 is pressed by the drum 43 and spool 44
It becomes a roll paper product 45 by being wound around. The basis weight (weight per unit area), thickness, and moisture of the web before coating are measured by the transmission type BM meter 29. The basis weight (weight per unit area), thickness, and moisture of the web after coating. Is a transmission type BM meter 4
By 2, it is possible to correct each measurement by giving feedback in the width direction and the flow direction of the web. The BM meter is a device equipped with sensors such as a grammometer (B meter), a moisture meter (M meter), and a caliper meter (paper thickness meter).

In particular, in the coating step D, as shown in FIG. 7, the two paper rolls 28a and 28b slide through the web while sliding in the width direction, and the basis weight, thickness, and moisture are chronologically arranged. A BM meter 29 for measuring and is provided. Downstream of the paper roll 28b, known supply headers 32a, 3
The coating liquid controlled to have a uniform thickness from 2b by the rod 33 is transferred from the surfaces of the coating rolls 30 and 31 to both surfaces of the web 10.

Further, the web 10 is changed in direction by an air blowing duct 34 having a porous surface, and then, between the drying boxes 35a and 35b having a porous (or infrared heater) having a hot air blowing function and a suction function. Dried through. After that, the web 10 is wrinkled by the expander roll 36 and then supplied to the plating (or ceramic) jacket roll 37.

[0009]

However, there are the following problems in the above-mentioned conventional coating process (web coating apparatus) of a papermaking machine. (1) Since the BM meter 29 is of the transmission type, the traveling distance of the web 10 between the drying roll 25 and the coating rolls 30 and 31 becomes longer depending on the amount of passage of the BM meter 29, and the speed of papermaking is increased. As the running speed becomes faster, the linear running of the web becomes unstable during this period, and the web is often cut, resulting in a decrease in operating efficiency and a long installation space.

(2) From the coating rolls 30, 31 to the web 1
When 0 is separated, the coating liquid is scattered between the coating rolls 30 and 31 and the web 10 due to viscosity, which easily causes uneven coating, and the air blowing duct 34.
However, there is a problem in that the operating efficiency is deteriorated because the sheet is easily soiled or the web 10 is easily cut.

(3) From the coating rolls 30, 31 to the web 1
It is preferable that the angle at which 0 separates is large in order to reduce uneven coating and scattering of the coating liquid. A possible means for this is to reduce the diameter of the coating roll, but when the diameter of the coating roll is reduced, the coating liquid is scattered due to centrifugal force. (4) Since the drying boxes 35a and 35b are installed, the traveling distance of the web 10 between the coating rolls 30 and 31 and the plating (or ceramic) outer coating roll 37 becomes long, and as the speed of papermaking becomes faster, In this case, the straight running of the web 10 becomes unstable, and the web 10 is often broken to reduce the operation efficiency, and the installation space also becomes long.

(5) The elongation changes depending on the properties of the coating liquid and the web 10, and the canvas 22b and the plating (or ceramic) must be delicately controlled unless the speeds of the expander roll 36 and the plating (or ceramic) outer cover roll 37 are delicately controlled.
Frequently, wrinkles are formed in the web 10 between the outer cover roll 37 and the outer roll 37, which causes a problem that the operating efficiency is deteriorated. (6) To measure with the BM meters 29 and 42,
The free running distance of the web 10 is required, and the web 10 is easily caught by the traverse head of the BM meters 29 and 42,
This caused deterioration of operational efficiency. In addition, since radiation is used, strict handling is required.

The present invention was devised in view of the above-mentioned problems, and a uniform coating of a web can be stably obtained in a small installation space, and the operation efficiency can be improved. An object is to provide an engineering device.

[0014]

Therefore, the web coating apparatus of the present invention according to claim 1 is a web coating apparatus having coating rolls corresponding to both sides of the web. An air blowing roll is provided for transferring the treated web in a non-contact manner.

Further, it is preferable that a heated air supply roll for drying the web treated by the coating roll and a heated air supply box are installed opposite to each other so as to form a traveling path of the web. (Claim 2). It is preferable that the air blowing roll is configured so that the air volume can be adjusted (claim 3).

A shower and a doctor for removing dirt on the surface of the web are preferably provided on the outer circumference of the air blowing roll (claim 4). The web coating apparatus of the present invention according to claim 5, wherein the web coating apparatus is provided with coating rolls corresponding to both sides of the web, and a heated air supply roll for drying the web treated by the coating roll. And a heated air supply box are installed opposite to each other so as to form a traveling path of the web.

It is preferable that each of the web coating devices described above is provided with a measuring means for measuring the state of the web by a reflection method in order to control the coating amount (claim 6). The web coating apparatus of the present invention according to claim 7 is a web coating apparatus equipped with coating rolls corresponding to both sides of the web, and the state of the web is measured by a reflection method in order to control the coating amount. It is characterized by the provision of measuring means for

The measuring means detects the surface condition of the web by processing the captured camera image,
It is preferable to have means for detecting the thickness of the web by laser light and means for measuring the water content of the web by infrared rays (claim 8).

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. First, a web coating apparatus as a first embodiment of the present invention will be described. FIGS. 1 to 3 show a web coating apparatus as a first embodiment of the present invention, and FIG. 1 shows its configuration. FIG. 2 is a schematic side view, FIG. 2 is a schematic cross-sectional view showing the air blowing roll, and FIG. 3 is a schematic cross-sectional view showing the main parts of the heated air supply box and the heated air supply roll. 1 to 3, the same reference numerals as those in FIG. 7 indicate the same things, and the description thereof is partially omitted.

The papermaking machine according to the present embodiment includes each step (equipment) such as a paper layer forming step A, a dehydration step B, a drying step C, a coating step D, a drying step E, a smoothing step F, and a winding step G.
Although it is configured (see FIGS. 5 and 6), the coating process (coating equipment) D is provided as the center, and several different characteristic configurations from the conventional example are provided. That is, as shown in FIG. 1, in the web coating apparatus (coating equipment) D of the present embodiment, the web 10 discharged from the drying roll 25 in the previous step (drying step C) passes through the paper roll 128a and then the supply header. 1
32b is contacted with the coating liquid on the surface of the pressure roll 131, which is supplied from 32b and controlled to have a uniform thickness in the width direction by the rod 133,
Next, the coating liquid is transferred to both surfaces of the web 10 from the supply header 132a by being brought into contact with and pressurized by the coating liquid on the surface of the rubber outer coating roll 130 whose width is controlled to be uniform by the rod 133. It has become so.

Further, with the web 10 stuck to the rubber outer coating roll 131, first, the rubber outer coating roll 1 is formed.
The rubber outer coating roll 131 while being supported by an air blowing roll 134 having a porous surface apart from
Away from the heated air supply box 135a having a porous surface (or an infrared heater) on the surface and a heated air supply roll 135b having a porous surface, the auxiliary drying is performed, and the direction is changed by an air blowing roll 136, The plurality of plating (or ceramic) jacket rolls 3 are sent to the plating (or ceramic) jacket roll 37 in the next step (drying step E).
After passing through the suction box 27, the suction box 27, and the suction roll 26, the smoothing process F is performed from the paper roll 128b.

Final Drying Roll 25, Paper Roll 12
8a, final plated (or ceramic) outer coating roll 37,
On each outer circumference of the paper roll 128b, a reflection type BM meter (measuring means) toward the web 10, that is, a surface state of the web (alignment of fibers by time series CCD camera image processing while sliding in the width direction). ), BM meters 129a, 129b, 14 for measuring thickness by laser light and moisture by infrared light
2a and 142b are provided.

Such BM meters 129a, 129b, 1
The density of the web 10 is predicted from the thickness and the surface condition of the web 10 obtained through 42a and 142b, and
The coating amount can be controlled through the rotation of 33 and the concentration of the coating liquid. By the way, heated air supply box 135
Air blowing rolls 134 and 136 are arranged adjacent to each other on the upstream side and the downstream side of a and the heated air supply roll 135b. These air blowing rolls 134 (or 13
In FIG. 6), as shown in FIG. 2, a cylinder 1340 having a perforation 1341 and a hollow shaft 1345 are provided so as to project and a seal 1 is provided at the tip.
A pressurizing chamber 1346 is formed by being surrounded by a partition wall 1342 having an axial direction 343 and extending in the axial direction.

The hollow shaft 1345 has a plurality of openings 1347 in the width direction and a damper 134 mounted in the openings 1347.
In addition, since the pressurizing chamber 1346 is divided in the axial direction by the partition wall 1344 in the same manner as the number of openings, it is possible to control the air blowing amount and the pressure for each part in the width direction. It is like this. As shown in FIG. 3, the heated air supply box 135a includes a curved surface 135 having a perforation 1353.
2 and an axially extending partition wall 1 on the inner surface of the container 1351
The pressure chambers 1355a and 1360a are formed by being surrounded by 354.

Further, the heated air supply roll 135b has
The pressurizing chambers 1355b, 13 are surrounded by a cylinder 1357 having a multi-hole 1358 and an axially extending partition wall 1359 protruding from the outer surface of the hollow shaft 1361 and having a seal 1364 at the tip.
60b is formed. The web 10 has a heating chamber 135 surrounded by the curved surface 1352 of the heated air supply box 135a and the cylinder 1357 of the heated air supply roll 135b.
6, the pressurizing chambers 1355a and 1355b from the porous 1
While contacting with the air blown through 353 and 1358, the moisture is removed and dried, and the moist air passes through the perforations and exits from the pressure chambers 1360a and 1360b to the outside.

The running of the web 10 between the heating chambers 1356 is
The gap between the curved surface 1352 and the cylinder 1357, the pipe line 1362
It is stabilized by controlling the air volume and pressure of a (or 1362b) and 1363a (1363b). Further, although not shown, the pressurizing chamber 1355a (or 1355b), 1
The 360a (or 1360b) may be partitioned by a wall in the axial direction to control the air volume and the pressure, respectively.

The drying roll 25 and the paper roll 12
8a, the rubber outer coating rolls 130 and 131, and the plating (or ceramic outer coating) roll 37 can be speed-controlled so that the running of the web 10 is stable. Although not shown, the air blowing roll 134 (or 136) and the drying roll 135b are configured to be rotatable (not necessarily required to rotate at all times), and are provided with a shower 151 and a doctor 152 to prevent contamination. .

Since the web coating apparatus as the first embodiment of the present invention is constructed as described above, it has the following operational effects. That is, since the BM meter measures the web 10 traveling along with the surfaces of the heating roll 25 and the paper roll 128a by the reflection type, the web 10 is supported by the rolls and the traveling is stable and the web is difficult to be cut even if the papermaking speed becomes fast. Therefore, the operation efficiency is improved.

Also, the installation space is short. The web 10 separates from the coating roll 130 while being stuck to the surface of the coating roll 131, and then separates from the coating roll 131 while being supported by the air blowing roll 134. The angle at which the web 10 leaves can be secured twice as much as before without reducing the diameter, the scattering of the coating liquid between the coating roll and the web is reduced, and uneven coating does not occur. Further, since the air blowing roll 134 is rotated and the shower 151 and the doctor 152 can remove dirt on the surface, the web 10 is not broken and the operation efficiency is improved.

The web 10 has air blowing rolls 134, 1
Since it is supported so as to swell by the air pressure of the roller 36 and the heated air supply roll 135b, the running is stable and the web 10 is not broken even if the machine speed increases, and the operating efficiency is improved from this point as well. Furthermore, since drying after coating uses a curved surface, there is an advantage that the installation space can be shortened.

Even if the elongation changes depending on the properties of the coating liquid and the web 10, the change in the elongation of the web 10 can be easily absorbed by adjusting the air volume of the air blowing rolls 134 and 136.
Wrinkles are less likely to enter the web 10 and the operating efficiency is improved. B
M meters 129a, 129b, 142a, 142b are CC
Since the D camera image, laser light and infrared rays are used, the free traveling distance of the web 10 for measurement is unnecessary, and since these BM meters are reflection type, the traverse head and the web 10 are used.
Since the distance between and is too long, the web will not be caught and will not be cut, and the operating efficiency will be improved.

There is also an advantage that handling is easy because no radiation is used. As described above, according to the web coating apparatus of the present embodiment, uniform web coating can be stably obtained in a smaller installation space than in the past, and the operating efficiency can be reliably improved. Next, the second aspect of the present invention
Explaining a web coating apparatus as an embodiment, FIG. 4 is a schematic side view showing the configuration. In addition, in FIG. 4, the same reference numerals as those in FIGS.
Description of some of these is omitted.

As shown in FIG. 4, in this embodiment, the coating rolls 230 and 231 are obliquely arranged, and the air blowing roll 234 is brought close to the coating roll 230 and immediately upstream of the heated air supply roll 235b. The heated air supply box 235a is arranged below the heated air supply roll 235b. The web coating apparatus as the second embodiment of the present invention is configured as described above, and therefore has substantially the same operational effects as those of the first embodiment.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-mentioned embodiments, and various modifications can be made without departing from the spirit of the present invention.

[0035]

As described in detail above, according to the web coating apparatus of the present invention as set forth in claim 1, the web is supported so as to be expanded by the air pressure of the air blowing roll, so that the papermaking speed is increased. The running is stable and never breaks, improving operating efficiency. Further, it is possible to configure the web to be separated from the coating roll while being supported by the air blowing roll, and it is possible to secure the angle at which the web separates from the conventional roll without reducing the diameter of the coating roll. The scattering of the coating liquid between the work roll and the web is reduced, and uneven coating can be prevented.

According to the web coating apparatus of the present invention as defined in claims 2 and 5, since the web is supported so as to be expanded by the air pressure of the air blowing roll, the running can be stably cut even if the machine speed increases. And the operational efficiency is improved. Further, since the drying after coating uses a curved surface, there is an advantage that the installation space can be shortened. According to the web coating apparatus of the present invention as set forth in claim 3, even if the elongation changes depending on the properties of the coating liquid and the web, the change in the elongation of the web can be easily absorbed by adjusting the air volume of the air blowing roll. Wrinkles are less likely to occur and the operating efficiency is improved.

According to the web coating apparatus of the fourth aspect of the present invention, the dust on the web surface can be removed by the shower and the doctor while the air blowing roll rotates to support the web through the air. Therefore, the web is not cut and the dirt can be removed, and the operation efficiency is improved. According to the web coating apparatus of the present invention as set forth in claims 6 and 7, since the measuring means for measuring the state of the web by the reflection type is provided in order to control the coating amount, for example, on the surface of the paper roll. Since it is possible to measure the web running at, the web is supported by the rolls even if the speed of paper making is fast, the running is stable and difficult to cut, the operating efficiency is improved, and the installation space is short.

According to the web coating apparatus of the present invention as set forth in claim 8, the camera image, the laser light and the infrared light are used, and the free traveling distance of the web for measurement is unnecessary,
Moreover, since the measurement is performed by the reflection type, the distance between the traverse head and the web can be increased, and the web is not caught and is not cut, thereby improving the operation efficiency. Further, there is also an advantage that handling is easy because no radiation is used.

[Brief description of drawings]

FIG. 1 is a schematic side view showing a configuration of a web coating apparatus as a first embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view showing an air blowing roll of the web coating apparatus according to the first embodiment of the present invention.

FIG. 3 is a schematic cross-sectional view showing essential parts of a heated air supply box and a heated air supply roll of the web coating apparatus according to the first embodiment of the present invention.

FIG. 4 is a schematic side view showing the configuration of a web coating apparatus as a second embodiment of the present invention.

FIG. 5 is a schematic side view showing each step (equipment) in the upstream part of the paper manufacturing machine.

FIG. 6 is a schematic side view showing each step (equipment) in the downstream part of the paper manufacturing machine.

FIG. 7 is a schematic side view showing a downstream coating process (equipment) in the papermaking machine.

[Explanation of symbols]

1 Flow Box 2, 3 Endless Net 4 Wire Roll 5 Suction Roll 6, 7 Dehydrator 8 Suction Roll 9 Suction Box 10 Web 11 Suction Roll 12, 13 Felt 14, 15 Press Roll 18, 19 Felt 20, 21 Press Roll 22 a , 22b Canvas 25 Drying roll 26 Suction roll 27 Suction box 28a, 28b Paper roll 29 BM meter 30, 31 Coating roll 32a, 32b Supply header 33 Rod 34 Air blowout duct 35a, 35b Drying box 37 Plating (or ceramic) jacket Rolls 40, 41 Pressure roll 42 BM meter 43 Drum 44 Spool 45 Rolled paper product 128a Paper roll 129a, 129b, 142a, 142b BM meter (measuring means) 130, 131, 230, 231 Rubber outer coating roll 132a, 132b Supply Heh 133 rods 134, 136, 234 air blowing roll 1340 cylinder 1341 perforation 1342 partition wall 1343 seal 1344 partition wall 1345 hollow shaft 1346 pressurizing chamber 1347 opening 1349 damper 135a, 235a heated air supply boxes 135b, 235b heated air supply roll 1351 container 1352 Curved surface 1353, 1358 Porous 1354 Partition walls 1355a, 1355b, 1360a, 1360b Pressurizing chamber 135b Heating air supply roll 1356 Heating chamber 1357 Cylindrical 1359 Partition wall 1361 Hollow shaft 1362a, 1362b, 1363a, 1363b Pipe line 1364 Seal 151 Shower 152 Doctor A Paper layer forming process (paper layer forming equipment) B Dewatering process (dehydrating equipment) C Drying process (drying equipment) D Coating process (coating equipment) E Drying process (drying equipment) F Smoothing Degree (smooth equipment) G winding-up (take-up equipment)

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) F26B 13/10 F26B 13/10 C 13/16 13/16 13/20 13/20 F term (reference) 3F103 AA01 BC01 BC04 EA15 3L113 AA08 AB06 AC10 AC31 BA32 BA35 CA02 DA01 4F040 AA22 AB04 AC02 BA23 CB18 DA05 DA12 DB02 DB14 4F042 AA22 AB00 BA22 BA25 CA01 DA08 DB01 DB29 DB39 DF01 DF11 DF23 4L055 CH16 CH30 DA09 DA18 FA19 FA23 FA30 FA30 FA30

Claims (8)

[Claims] 1. A web coating apparatus equipped with coating rolls corresponding to both sides of the web, wherein an air blowing roll for transferring the web treated by the coating rolls in a non-contact manner is provided. And the web coating equipment. 2. A heated air supply roll for drying the web treated by the coating roll and a heated air supply box are installed opposite to each other so as to form a running path of the web. The web coating device according to claim 1. 3. The web coating apparatus according to claim 1, wherein the air blowing roll is configured so that the air volume can be adjusted. 4. The web according to claim 1, wherein a shower and a doctor for removing dirt on the surface of the web are provided on the outer periphery of the air blowing roll. Coating equipment. 5. A web coating apparatus comprising coating rolls corresponding to both sides of a web, wherein a heated air supply roll and a heated air supply box for drying the web treated by the coating roll are A web coating device, which is installed so as to face a web running path. 6. The web according to claim 1, further comprising measuring means for measuring the state of the web by a reflection method in order to control the coating amount. Coating equipment. 7. A web coating apparatus equipped with coating rolls corresponding to both sides of the web is provided with a reflection type measuring means for measuring the state of the web in order to control the coating amount. A web coating device characterized by: 8. The measuring means detects the surface condition of the web by processing a captured camera image, and detects the thickness of the web by laser light.
The web coating apparatus according to claim 6 or 7, further comprising means for measuring the moisture content of the web by infrared rays.