CN101139807B - The smoothing method of wet web and the press section for paper machine - Google Patents
The smoothing method of wet web and the press section for paper machine Download PDFInfo
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- CN101139807B CN101139807B CN200710149061.4A CN200710149061A CN101139807B CN 101139807 B CN101139807 B CN 101139807B CN 200710149061 A CN200710149061 A CN 200710149061A CN 101139807 B CN101139807 B CN 101139807B
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Abstract
The present invention relates to the smoothing method of wet web and the press section for paper machine, wrinkling with the paper web that the blowing and the wet web that prevent due to paper web are peeled off from thread belt and produced after passing transfer roller.Paper web smoothing method comprises, after wet web 1 processes in the last dewatering press roller 4 in squeezing stage, the step transmitted on suction roll 21 is drawn into by felt 6a, the wet web sucked by roller 21 is sent to and transmits suction roll 21 and form step on the first flat roll 12b of the first crush zone N1, and by transporting paper web through the second crush zone formed by the first flat roll and the second flat roll 12a, make the step that wet web 1 is level and smooth.
Description
Technical field
The present invention relates to the smoothing method of wet web and the press section of paper machine, it, for when wet web being sent to level and smooth pressure roller from press section with during by applying pressure in the paper surface from the last dewatering press roller the final step of press section thus make paper web level and smooth, stably transmitting wet web and preventing wet web wrinkling.
Background technology
In press section after wet end in the paper machine, wet web is by multiple squeezing unit press dewatering under paper web is inserted into the state in the middle of two felts, and then wet web is squeezed the surface with smooth paper, and then wet web is passed to dry run.
In recent years, the dewatering efficiency of each squeezing unit is improved, and has the trend of popular single-stage press section, is realized the dehydration of wet web by single-stage press section, to shorten the press dewatering time at press section, makes to simplify the structure simultaneously.
Common dewatering, is wherein provided with multiple squeezing unit, and repeatedly applies extruding force on wet web, is not easy to manufacture high bulking paper.
Such as, WO2004/101885A1 discloses the single-stage press section comprising press section and dryer section.This structure is shown in Figure 5.
In figure 6, from the wet web 01 that forming part (not shown) is advanced, picked up on felt 06a by suction roll 05a, under the state be then inserted between felt 06a and other felt 06b at paper web, be sent to final dewatering press section 04.
Final dewatering squeezing 04 comprises pressure roller (or base pressure roller (shoe press)) 04a and another pressure roller 04b, and utilizes the extruding force of pressure roller 04a and 04b to be sent to by the water comprised in wet web 01 on felt 6a and 6b, to realize dehydration.At the crush zone of pressure roller 04a and 04b, by applying pressure, the water not only comprised in wet web is sent to felt 06a and 06b but also is expressed as water in the process of S in the drawings and splashes down from felt.
By this way, the wet web 01 being about 80wt% at pressure roller 04a and 04b top moisture is dehydrated to moisture at pressure roller 04a and 04b end and is about between 50wt% to 55wt%.
The wet web 01 dehydrated at final pressure roller 04 place is picked up by suction roll 05b, and the one side of paper web is kept by felt 06b, and wet web is by a pair extruding transfer roller 011a and 011b, and extruding force (5 to 20KN/m) lower is wherein applied on paper web.Tapes 013 is made up of elastomeric material, has very level and smooth surface and airtight.Be fed to wet web 01 crush-zone extruding transfer roller 011a and 011b together with felt 06b by the tapes 013 that deflector roll 019 guides.Usually, the place that extruding force is applied in, wet web 01 adheres to and along with moving together on more level and smooth surface.Therefore, if under the state be sandwiched between tapes 013 and felt 06b at wet web 01, between extruding transfer roller 011a and 011b, apply extruding force, so wet web 01 adhere to there is the surface more level and smooth than the surface of felt 06b tapes 013 on.As a result, the Transfer pipe of wet web 01 is the surface of tapes 013 from the surface modification of felt 6b.Further, tapes 013 can be formed with permeable belt, as long as the surface smoothing of the surface ratio felt 06b of tapes 013.
Under the state that wet web 01 is kept by tapes 013 in the one side of wet web 01, by the extruding force effect of the crush zone of top pressure roller 012a and bottom press roller 012b.Then, the smoothing processing on the two sides of wet web 01 is performed.Level and smooth pressure roller 012 is set to the afterbody of the press section 02 of paper machine.In this structure, level and smooth pressure roller 02 is arranged at the downstream of final dewatering pressure roller 04, and wherein final dewatering pressure roller 04 are for dewatering to the wet web 01 in press section 02.
Thereafter, wet web 01 by being sent to dryer section 03 by canvas 07c, then from the first drier 3a by not being that the second drier and the 3rd drier that show in order are to perform the drying of wet web 01.It should be noted that label 020a and 020b in Fig. 5 respectively represents a vacuum furnace.
Felt 06a and 06b is circulation, and after passing through pressure roller 04a and 04b, felt is recycled to upstream side in order to reuse.In the backward channel of unshowned in the drawings felt, then felt 06a and 06b rinses through low pressure water-bath will be included in the water removing of felt by the suction being arranged in the suction box on backward channel.Once the water comprised is removed, felt 06a and 06b is used for transmitting wet web again.
In the common Paper making procedure of this shown in Fig. 6, at the press section upstream side of extruding transfer roller 011a and 011b, tend to produce air accumulation k between wet web 01 and felt 06b, this depends on the Papermaking Conditions of such as basis weight or paper production speeds.If apply extruding force when there is air accumulation k by extruding transfer roller 011a and 011b, the air blowing that wet web upwards rises from felt 06b creates, and causes producing wrinkle on paper.
Air accumulation k causes in the following manner.After dewatering with final dewatering pressure roller 04, when applied pressure is released, air is inhaled into has infiltrative felt 06b, and when extruding transfer roller 011a and 011b and applying pressure in the felt 06b keeping water, the air of suction is discharged.But portion of air has been retained in the positive upstream of crimping section, cause the air accumulation k between felt 06b and wet web 01.
The formation of the wrinkle of wet web 01 makes paper defectiveness and makes advancing of the wet web in follow-up phase become complicated.Particularly, if wet web on paper, have wrinkle to be formed state under be sent to dryer section 03, wet web advancing in dryer section becomes unstable, and the drying of paper becomes uneven at the width of paper.
After passing common transfer roller 011a and 011b, wet web 01 is sent to level and smooth pressure roller 012 under simultaneously remaining on the state on tapes 013 wherein.But, if the present inventor finds that wet web 01 is by the uneven maintenance of tapes 013, when advancing to german press roller 012a and 012b from extruding transfer roller 011a and 011b, the wet web 01 comprising water can be peeled off from tapes 013 due to the weight of himself, causes the low part m on wet web as shown in Figure 5.Problem is that low part m can cause wrinkle at crush zone on wet web when the wet web with low part m is extruded by flat roll.
In the common press section shown in Fig. 5, in the outlet of the crush zone of extruding transfer roller 011a and 011b, wet web 01 is separated with felt 06b, is then transported to tapes 01.Under the state that wet web 01 is kept by tapes 013 in the one side of wet web 01, by the extruding force effect of the crush zone of german press roller 012a and 012b.Then, the smoothing processing on the two sides of wet web 01 is performed.Then, in the outlet of the crush zone of top german press roller 012a and bottom german press roller 012b, wet web need from tapes 013 be separated then be sent to bottom german press roller 012b surface.
When applying extruding force, wet web 01 adheres on more level and smooth surface.Therefore, tapes 013 must have the surface more level and smooth than the surface of felt 06b, but again can not be equally level and smooth with the surface of bottom german press roller 012b.Thus, the surface smoothness of tapes 013 must in a very strict scope.If the outlet of the crush zone at german press roller 012a and 012b, instead of german press roller 012b place, bottom, wet web is sent to tapes 013, and paper web will break.
The unshowned in the drawings backward channel of usual tapes 013 is cleaned.The wet web easy degree adhered on tapes also depends on the degree of drying of tapes.When tapes is wet, wet web 01 is easy to adhere on tapes 013.And the operating condition of paper machine often changes, and tapes was worn and torn along with the time.The wearing and tearing of tapes change the smoothness of belt surface.
But, the maintenance that single tapes is difficult to realize wet web be separated.Same be difficult to rely on operating condition the surface smoothness of tapes to be remained in an above-mentioned strict scope, the maintenance of tapes becomes difficulty with being separated, and causes the instability of advancing of wet web.
Summary of the invention
Consider the problems referred to above and form the present invention, and the object of the invention is to prevent paper web wrinkling and suppress defective product due to paper blowing (hereinafter referred to blowing), and increasing the run stability of paper machine.
Another object of the present invention prevents wet web from peeling off from thread belt after transfer roller transports out.
In addition, another object of the present invention is the requirement should by meeting smoother lower roll (as shown in the 12b in Fig. 1) simply with the surface more smooth than thread belt (as Suo Shi 13 in Fig. 1), and do not make the surface smoothness of thread belt maintain in less scope, advance to realize the stable of wet web.
In order to realize object as mentioned above, a first aspect of the present invention provides the smoothing method of wet web, wherein for the level and smooth pressure roller on surface of the wet web in smoothly transmitting, as the last pressure roller of the expressing process of paper machine, described method comprises step:
When the two sides of wet web is supported by the first and second felts, in the last dewatering press roller of paper machine after process, by the second felt, wet web is drawn into and transmits on suction roll, wet web is removed from the first felt;
In the downstream removing step, pass by the wet web supported by the second felt the first crush zone formed by transmission suction roll and the first flat roll, wet web is sent to the first flat roll from the second felt; And
By transporting paper web through the second crush zone formed by the first flat roll and the second flat roll, make wet web level and smooth.
In traditional press section after the wet end of paper machine, wet web in the squeezing stage by least one pair of pressure roller, pressurized and dehydration.On the other hand, with the paper web smoothing method of a first aspect of the present invention, when wet web is supported on two sides by the first and second felts, wet web transports out from the last pressure roller of dewatering press, and then wet web is drawn into by the second felt and transmits on suction roll, and removes from the first felt.
Then, being drawn into the wet web transmitted on suction roll by the second felt, by transporting it through the first crush zone, being sent on the first flat roll, then, when paper web is attached to the first flat roll, paper web pressurized is conveyed through and by the second level and smooth crush zone.At the first crush zone, the first flat roll should have the surface more smooth than felt, and wet web is sent on the first flat roll.
As above narrating, when being inserted between thread belt and felt by paper web as traditional method, by removing a pair for pressing the transmission extruding rod of wet web, the invention solves the air accumulation problem of the transmission extruding rod occurred at crush zone.
Because wet web is supported on the Distance Shortened under band, the stripping of paper web as above can not occur.
In addition, except needing the first flat roll, there is the surface more level and smooth than felt, wet web is sent to beyond the first flat roll from felt, do not need a thread belt to perform the adhesion of wet web and to separate, or as when traditional press section, for keeping the fineness on the surface of thread belt in the scope in period exceeding prolongation.Use this structure, the setting of the surface smoothness of thread belt 13 is easy to, and the surface of same felt does not have the surface smoothing of the first flat roll, and the stable transmission of paper web becomes possibility.
Surface smoothness is evaluated by measurement and comparison surface texture.Such as, by the method limited in JIS B 0651, and the instrument compare that according to " geometric product specification (the GPS)-superficial makings: contour method-rule and the process for assessment of superficial makings " that limit in JIS B 0633, the superficial makings of felt and the first flat roll can be used " geometric product specification-for the instrument of the measurement of superficial makings ".Coarse texture can change coarse surface into.
A second aspect of the present invention relates to the smoothing method of wet web, and wherein for the level and smooth pressure roller on surface of the wet web in smoothly transmitting, as the last pressure roller of the expressing process of paper machine, described method comprises step:
When the two sides of wet web is supported by the first and second felts, wet web after process, is drawn into by the second felt wet web and transmits on suction roll, wet web is removed from the first felt in the last dewatering press roller of paper machine;
By making the wet web supported by the second felt through the first crush zone formed by the first flat roll and compression roller that are arranged in the downstream removing step, wet web is sent to the first flat roll from the second felt; And
By transporting paper web through the second crush zone formed by the first flat roll and the second flat roll, make wet web level and smooth.
A second aspect of the present invention is from the different of first aspect, in the last dewatering press of paper machine after process, by the second felt, wet web being drawn into transmits on suction roll, and the downstream of the step that wet web is removed from the first felt, first crush zone is not formed by transmission suction roll and the first flat roll, but is formed by the first flat roll and compression roller being positioned at the downstream of transmitting suction roll.The smoothing step making the wet web that runs at the first crush zone level and smooth is outward same structure with a first aspect of the present invention.
In order to change extruding force by transmitting suction roll, what worry is the suction vestige appeared on paper, and thus extruding force can not freely change.But in a second aspect of the present invention, reset compression roller, and crush zone is formed between compression roller and the first flat roll, realizing extruding force thus can change.Therefore, transmitting suction roll no longer needs to possess squeeze function, thus solves the worry occurring sucking vestige on paper.
In addition, transmit on suction roll by being arranged on by compression roller, paper web is vertically advanced at compression roller and transmitting between suction roll, and therefore gravity is that this side up is inoperative, wet web can not be removed from felt.
Normally hard roller is used for flat roll to apply pressure to wet web.Preferably cover at least one in flat roll, to guarantee nip width with soft coating.
Such as of the present invention first or second aspect smoothing method in, preferably wet web is by transporting through the second crush zone and by smoothly together with thread belt, and the surface contacting the thread belt of wet web does not have the smooth surface of the first flat roll.
As described above, by transmitting wet web together with thread belt, improve advancing of wet web.In addition, by manufacturing thread belt with elastomeric material, the nip width of requirement can be guaranteed, thus at least one in the coating equipment flat roll of elimination softness is to guarantee the needs of nip width, and prevents clad surface from becoming unsmooth and vibrating.And the smooth surface by making the surface of thread belt not have the first flat roll, in the exit of the crush zone formed by the first and second flat rolls, can easily wet web be transferred on the first flat roll.
In traditional press section as shown in Figure 5, the surface of thread belt must be more smooth than felt, but do not have the first smooth belt smooth, and depend on service condition, the adhesion of wet web and thread belt and separate and become difficulty, and advancing of wet web becomes unstable.But the present invention only requires that the surface of thread belt does not have the smooth surface of the first smooth belt, and this requirement can easily realize, thus the instability solving wet web in prior art transmits problem.
Thus, the permissible range of the surface smoothness of thread belt becomes wider, this provides greater flexibility with alternative pack when changing thread belt.Due to loosening of requiring, then there is the advantage in the life-span increasing parts.
In addition, more smooth thread belt is equivalent to worse air permeability.In order to increase the surface smoothness of wet web, preferably use the band not having air permeability.But if thread belt is made do not have air permeability, air accumulation directly occurs in the upstream of the second crush zone.Because air accumulation k causes paper web to be dried, wherein paper web rises from the first flat roll, and thus thread belt must have suitable air permeability.Owing to preventing blowing from being emphasis, thus thread belt should have low air permeability.
As the device realizing a first aspect of the present invention about paper web smoothing method, the present invention is provided with the press section for paper machine.The press section of paper machine is set to the last pressure roller of expressing process, and has and make the surface of operating wet web by level and smooth level and smooth pressure roller, and described press section comprises:
Transmit suction roll, when the two sides of wet web is supported by the first and second felts, wet web after process, transmits suction roll and sucks wet web by the second felt, wet web is removed from the first felt in the last dewatering press roller of paper machine; First flat roll, for level and smooth and for making wet web from the second felt transmission, it forms the first crush zone with the transmission suction roll sucked in the downstream of step; And
Second flat roll, by transporting paper web through the second crush zone formed by the second flat roll in the first crush zone downstream and the first flat roll, for level and smooth wet web.
About in a first aspect of the present invention of press section, when the two sides of wet web is supported by the first and second felts, wet web after process, transmits suction roll and sucks wet web by the second felt, wet web is removed from the first felt in the last dewatering press roller of paper machine.
In downstream, the first crush zone is by transmitting suction roll and the first flat roll is formed.The wet web supported by felt transports through the first crush zone, and removes from felt at the exit wet web of the first crush zone, and wet web is sent to separately on the surface of the first smooth belt.
In the case, the surface of the first flat roll is obtained more smooth than felt, wet web can be removed from felt, and be sent on the surface of the first flat roll.
Subsequently, the one side of wet web is attached to the first flat roll and advances, and the second crush zone by being formed by the second flat roll in the downstream of the first crush zone and the first flat roll.At the second crush zone, paper surface applies pressure, thus make wet web level and smooth.
Like this, the press section of the first aspect of the application of the invention, the paper web smoothing method of a first aspect of the present invention can realize, and by a first aspect of the present invention about paper web smoothing method, can obtain above-mentioned effect.
As the device realizing a second aspect of the present invention about paper web smoothing method, the present invention is provided with the press section for paper machine.Press section as a second aspect of the present invention is set to the last pressure roller of expressing process, and has and make the surface of operating wet web by level and smooth level and smooth pressure roller, and described press section comprises:
Transmit suction roll, when the two sides of wet web is supported by the first and second felts, wet web after process, transmits suction roll and sucks wet web by the second felt, wet web is removed from the first felt in the last dewatering press roller of paper machine;
First flat roll, is positioned at the downstream of transmitting suction roll;
Compression roller, for making the wet web sucked by transfer roller be sent to it from the second felt, itself and the first flat roll form the first crush zone;
Second flat roll, by transporting paper web through the second crush zone formed by the second flat roll in the first crush zone downstream and the first flat roll, for level and smooth wet web.
About in a second aspect of the present invention of press section, the first crush zone is formed by the compression roller and the first flat roll being positioned at the downstream of transmitting suction roll.The wet web supported by felt is transported by the first crush zone, thus transmits wet web on the surface of the first flat roll.Next, wet web is transported the second crush zone through being formed by the first and second flat rolls, and paper web is by smoothly, and this is the mode the same with a first aspect of the present invention.
If extruding force is adjustable at transmission suction roll place, what worry is occur sucking vestige on paper, and thus extruding force can not freely regulate.But, in a second aspect of the present invention, compression roller is set individually extruding force can be changed.Use this structure, suction roll is not used as compression roller, thus solves the worry to the suction vestige on paper.
In addition, transmit on suction roll by being arranged on by compression roller, paper web is vertically advanced at compression roller and transmitting between suction roll, and therefore gravity is that this side up is inoperative, wet web can not be removed from felt.Transmitting range in press section also shortens.
Like this, the press section of the second aspect of the application of the invention, the paper web smoothing method of a second aspect of the present invention can realize, and by a second aspect of the present invention about paper web smoothing method, can obtain above-mentioned effect.
In addition, preferably use variable crown roller for compression roller, the longitudinal direction extruding force along roller can freely be controlled, and this is the effect that the present invention increases.
In in of the present invention first and second of press section, preferably arrange thread belt for passing the level and smooth wet web of the second crush zone by transporting wet web, wherein the paper-contacting surface of thread belt does not have the smooth surface of the first flat roll.Use this structure, improve the operation of paper web at the second crush zone.By using elastic thread band, the extruding force of requirement can be guaranteed, and above-mentioned effect can be realized.
According to a first aspect of the present invention about paper web smoothing method and press section, wet web is sent to the first flat roll by felt.Surface smoothness due to the first flat roll easily can be arranged to the height than felt, and wet web can be guaranteed to be sent to the first flat roll from felt, thus realizes the steady running of the press section of paper machine.
This configuration eliminates the transfer roller for support wet paper web, as traditional situation, in the upstream of the first and second flat rolls, by applying pressure from the teeth outwards, wet web is sent to the demand of thread belt from felt.
Thus, solve the problem of the crush zone generation air accumulation at transfer roller, and eliminate the transfer path of the wet web that the one side between transfer roller peace sliding pressure roller is supported by thread belt, thus prevent the stripping of paper web.Thus, stable running becomes possibility, and it is wrinkling due to the stripping of paper web or the gathering of air, paper web not to occur.And the transfer path of paper web becomes short and compact in press section of the present invention.
According to a second aspect of the present invention about paper web smoothing method and press section, except the effect obtained by a first aspect of the present invention, compression roller is arranged on the downstream of transmitting suction roll, and the first crush zone is formed by compression roller and the first flat roll, thus the first crush zone is allowed to apply variable extruding force.
In addition, preferably can use variable crown roller to compression roller, make the longitudinal direction along roller or circumferencial direction, extruding force can freely control, and this is supplementary result of the present invention.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the structure of the press section that the first embodiment of the present invention is shown.
Fig. 2 is the schematic diagram of the structure of the press section that the second embodiment of the present invention is shown.
Fig. 3 is the vertical cross-section of the example that the crown variable roller used is shown in the second embodiment.
Fig. 4 is the viewgraph of cross-section of the A-A along Fig. 3.
Fig. 5 shows the structure of the press section for common paper machine.
Fig. 6 A is the zoomed-in view of the press section for common paper machine, and Fig. 6 B is the fragmentary, perspective view of the amplification of press section.
Detailed description of the invention
The preferred embodiments of the present invention describe in detail with reference to accompanying drawing.But unless should expect illustrating especially, the size, material, relative position etc. of part in an embodiment should only be thought illustrative, instead of the restriction of scope of the present invention.
Fig. 1 is the schematic diagram of the structure of the press section that the first embodiment of the present invention is shown.Fig. 2 is the schematic diagram of the structure of the press section that the second embodiment of the present invention is shown.Fig. 3 is the vertical cross-section of the example that the crown variable roller used is shown in the second embodiment.Fig. 4 is the viewgraph of cross-section of the A-A along Fig. 3.
First embodiment
In Fig. 1 that the first embodiment is shown, under wet web 1 state that one side is kept by net 8 wherein, from not shown wet end transmission, it is held by suction roll 5a and is kept by felt 6a in one side, under the state that paper web 1 is inserted between felt 6a and 6b, it is sent to last dewatering press roller 4 further.Last dewatering press roller 4 comprises base module 4a and lower press 4b, is applied to wet web 1 by its extruding force, to transfer in felt 6a and 6b water contained in paper web to complete the removal of water.Arrow in accompanying drawing shows the direct of travel of wet web 1.
In last dewatering press roller 4, the wet web 1 of dehydration is inserted between felt 6a and 6b, and is sent to transmission suction roll 21.By transmitting the absorption of suction roll 21, wet web 1 is drawn into by felt 6a one side and transmits on suction roll 21, thus removes from felt 6b at another side.
In downstream, transmit suction roll 21 and form the first crush zone N with smoother lower roll 12b
1.Wet web 1 enters the first crush zone N
1, and at the first crush zone N
1outlet, due to the difference of surface smoothness between felt 6a and smoother lower roll 12b, paper web is removed from felt 6a, and is sent on smoother lower roll 12b.At the first crush zone N
1, because air vacuumizes by transmitting suction roll 21, generation of therefore not drying.
At the first crush zone N
1downstream, between smoother lower roll 12b and smoother top roll 12a, form the second crush zone N
2.
Preferably, smoother top roll 12a and the smoother lower roll 12b hard coating of such as hard rubber covers to increase surface smoothness.Hard coating preferably has according to JIS (Japanese Industrial Standards) 99 ° or higher hardness.
At the first crush zone N
1by felt 6a, pressure is applied to the surface of wet web 1, wet web 1 is removed from felt 6a, and arrive on smoother roller 12, its surface has higher fineness relative to felt 6a.The wet web 1 be sent on smoother lower roll 12b is transported to the second crush zone N
2.
The second crush zone N is transported through together with wet web 1
2thread belt (threading belt) 13, can be made up to form smooth surface of the elastomeric material of such as rubber, and there is less air permeability (moisture Absorption Characteristics enough absorbs a small amount of water).Thread belt 13 is through deflector roll 18 and at the second crush zone N
2pressurized together with wet web 1.
By travelling across the second crush zone N together with wet web 1
2, thread belt 13 improves advancing of wet web 1, and produces elastic deformation at crush zone, guarantees nip width thus.
The surface of thread belt does not have the smooth surface of smoother lower roll 12b, makes wet web 1 at the second crush zone N
2exit can be sent on the surface of smoother lower roll 12b.By making thread belt 13 have air permeability a little, can prevent at the second crush zone N
2the blowing occurred.
At the second crush zone N
2, extruding force is applied on wet web and thread belt 13, and the two sides of wet web is all by smoothly.After this, because smoother lower roll 12b has the surface more smooth than thread belt 13, wet web 1 continues to be kept by smoother lower roll 12b.
In addition, if there is not above-mentioned blowing, thread belt 13 can omit, and wet web 1 can be independent is transmitted through the second crush zone N
2.In the case, smoother top roll 12a should be the rubber surface roller of the coating of the softness being coated with such as rubber coatings, makes smoother lower roll 12b have the surface more smooth than smoother top roll 12a.Use this structure, wet web 1 keeps adhering to smoother lower roll 12b, and by using stiff materials to the surface of smoother top roll 12a, can guarantee nip width.
When being provided with thread belt 13, deflector roll 18 can reduce, and makes to suppress at the second crush zone N
2locate the blowing occurred, thread belt 13 pressurized (winding) heads on smoother lower roll 12b.
Preferably make thread belt have air permeability a little, make can prevent just at the second crush zone N
2the blowing before occurred.But, also may suppress blowing by reducing deflector roll 18, making thread belt 13 suppressed and being wound around to head on smoother lower roll 12b.Therefore, thread belt can be non-air permeability, to improve the fineness of paper surface.
After this, wet web 1 is transported to the second dryer roll and then to the 3rd dryer roll, these rollers are not shown in the accompanying drawings, and it is transported to dryer section 3 together with canvas 7c, dry wet paper web 1 thus.Show vacuum furnace 20a and 20b in FIG, deflector roll 14 to 19 and 22, for determining wet web 1, felt 6a and 6b, the position of thread belt 13 and other travel path.
According to the first embodiment, there is no need to arrange transfer roller, it squeezes wet web 1 under paper web is clipped in the state between threaded portion and felt, to be sent to thread belt from felt by paper web.Therefore, the problem of drying due to air accumulation generation at the crush zone of transfer roller is solved.
In addition, present invention addresses the stripping problem of paper web, because eliminate when being attached to the lower surface of thread belt, the travel path of the wet web between transfer roller and smoother pressure roller.Thus, stable operation becomes possibility, and not due to the stripping of paper web or the gathering generation paper web of air wrinkling.And compared with traditional press section, the travel path of paper web becomes short and compact in press section of the present invention.
Except needing smoother lower roll 12b to have except the surface more smooth than thread belt 13, a thread belt is not needed to perform the adhesion of wet web and separate.Use this structure, the setting of the surface smoothness of thread belt 13 is easy to, and therefore the operation conditions of paper machine does not affect the stable transmission of wet web.
Therefore, the permissible range of the surface smoothness of thread belt 13 becomes wider, this provides greater flexibility with alternative pack when changing thread belt.Due to loosening of requiring, then there is the advantage in the life-span increasing parts.
Second embodiment
The second embodiment of the present invention illustrates in fig. 2.Be to transmit suction roll 21 with the difference of the first embodiment and smoother lower roll 12b directly forms the first crush zone N
1, the compression roller 12c be made up of variable crown roller is arranged on the downstream of transmitting suction roll 21, and the first crush zone N
1formed by compression roller 12c and smoother lower roll 12b.Except this difference, remaining is similar to the first embodiment, and same label is in a second embodiment for same parts.Therefore, the explanation to common parts is omitted.
In second embodiment with said structure, in press section 2, be inserted into the wet web 1 between felt 6a and 6b, pressurized in last dewatering press portion 4 and dehydration, and be drawn into by felt 6a and transmit on suction roll 21, and then remove from felt 6b.
Subsequently, wet web 1 is advanced together with felt 6a, through the first crush zone N formed by compression roller 12c and smoother lower roll 12b
1, and at the first crush zone N
1exit, because smoother lower roll 12b has the surface more smooth than felt 6a, wet web 1 is removed from felt 6a, and is sent on smoother lower roll 12b.
Next, at the second crush zone N
2, wet web by pressurized together with thread belt 13 by smoothly.At the second crush zone N
2exit, because smoother lower roll 12b has the surface more smooth than thread belt 13, wet web 1 is removed from thread belt 13, and keep be attached to and will be transported to further together with canvas 7c on the smoother lower roll 12b of dryer section 3.
Compression roller 12c is made up of variable crown roller, and can freely adjust to change the extruding force heading on smoother lower roll 12b.Variable crown roller is combined into and surface pressing can be changed along the circumference of roller and axial direction, and has known this structure so far.As an example, disclosed in JP61-24813A, structure shows in figs. 3 and 4.
Illustrated by Fig. 3 and Fig. 4, variable crown roller 30 supports the cylindrical compartments 31 that can rotate around central shaft 32 by bearing 36, and central shaft 32 in axial direction has discharge chambe 35.By the compressed oil provided for discharge chambe 35, compression piston 34 is moved, and by compressing the deflection of the adjustable compartment 31 of base 33, the surface pressing opposed between wheel 37 and compartment 31 can be controlled thus.
In addition, compression base 33, compression piston 34 and discharge chambe 35 separate along the axial direction of roller, make surface pressing in axial direction also adjustable.Use this structure, accurate Stress control becomes possibility.
According to the second embodiment, compression roller 12c is made up of variable crown roller, and the extruding force between 12b and 12c can freely be regulated.When be similar to the first embodiment with transmission suction roll 21 squeeze paper web, due to worry on paper occur suck vestige, higher surface pressing can not be applied.On the other hand, in a second embodiment, apply extruding force by compression roller 17, thus avoid and eliminate the possibility sucking vestige, and extruding force freely can regulate.
In addition, transmit above suction roll 21 by being arranged on by compression roller 12c, paper web is vertically advanced between compression roller 12c and transmission suction roll 21, and gravity is inoperative from the direction that felt is removed by wet web.In addition, the travel path of paper web can be shortened in the horizontal direction.
In the first and second embodiment, only last dewatering press roller 4 is set to dewatering press roller.But multiple dewatering press roller can be arranged on the upstream of last dewatering press roller.
According to the present invention, when transport pressurized and the wet web of dehydration to level and smooth pressure roller in the final step of the press section of paper machine time, eliminate transfer roller, solve the air accumulation of the crush zone at transfer roller, and the stripping of wet web between transfer roller peace sliding pressure roller, prevent wrinkling, and the stable transmission of wet web become possibility in press section.
Claims (6)
1. a smoothing method for wet web, wherein for the level and smooth pressure roller on surface of the wet web in smoothly transmitting, as the last pressure roller of the expressing process of paper machine, wherein, described method comprises step:
When the two sides of wet web is supported by the first and second felts, in the last dewatering press roller of paper machine after process, by the second felt, wet web is drawn into and transmits on suction roll, wet web is removed from the first felt;
In the downstream removing step, pass by the wet web supported by the second felt the first crush zone formed by transmission suction roll and the first flat roll, wet web is sent to the first flat roll from the second felt; And
By transporting wet web through the second crush zone formed by the first flat roll and the second flat roll, make wet web level and smooth,
Elastic thread band is transported through the second crush zone by deflector roll together with wet web, make wet web between the first flat roll and elastic thread band by smoothly, first flat roll and the second flat roll are covered by hard coating, and the surface of the elastic thread band contacted with wet web does not have the smooth surface of the first flat roll
By making deflector roll reduce, described thread belt is pressed to described first flat roll.
2. a smoothing method for wet web, wherein for the level and smooth pressure roller on surface of the wet web in smoothly transmitting, as the last pressure roller of the expressing process of paper machine, wherein, described method comprises step:
When the two sides of wet web is supported by the first and second felts, in the last dewatering press roller of paper machine after process, by the second felt, wet web is drawn into and transmits on suction roll, wet web is removed from the first felt;
By making the wet web supported by the second felt through the first crush zone formed by the first flat roll and compression roller that are arranged in the downstream removing step, wet web is sent to the first flat roll from the second felt; And
By transporting paper web through the second crush zone formed by the first flat roll and the second flat roll, make wet web level and smooth,
Elastic thread band is transported through the second crush zone by deflector roll together with wet web, make wet web between the first flat roll and elastic thread band by smoothly, first flat roll and the second flat roll are covered by hard coating, and the surface of the elastic thread band contacted with wet web does not have the smooth surface of the first flat roll
By making deflector roll reduce, described thread belt is pressed to described first flat roll.
3. for a press section for paper machine, it is set to the last pressure roller of expressing process, and has the surface smoothing level and smooth pressure roller making operating wet web, and wherein, described press section comprises:
Transmit suction roll, when the two sides of wet web is supported by the first and second felts, in the last dewatering press roller of paper machine after process, sucking wet web by the second felt, removing from the first felt for making wet web;
First flat roll, for making wet web from the second felt transmission, it forms the first crush zone with the transmission suction roll sucked in the downstream of step;
Second flat roll, is passed in the second crush zone formed between second flat roll in the first crush zone downstream and the first flat roll, for level and smooth wet web by transporting wet web; And
Elastic thread band, the second crush zone is transported through together with wet web by deflector roll, and make wet web level and smooth between the first flat roll and elastic thread band, first flat roll and the second flat roll are covered by hard coating, and the surface of the elastic thread band contacted with wet web does not have the smooth surface of the first flat roll
By making deflector roll reduce, described thread belt is pressed to described first flat roll.
4. for a press section for paper machine, it is set to the last pressure roller of expressing process, and has the level and smooth pressure roller making the surface smoothing of operating wet web, and wherein, described press section comprises:
Transmit suction roll, when the two sides of wet web is supported by the first and second felts, in the last dewatering press roller of paper machine after process, sucking wet web by the second felt, removing from the first felt for making wet web;
First flat roll, is positioned at the downstream of transmitting suction roll;
Compression roller, for making the wet web sucked by transfer roller be sent to the first flat roll from the second felt, itself and the first flat roll form the first crush zone;
Second flat roll, is passed in the second crush zone formed between second flat roll in the first crush zone downstream and the first flat roll, for level and smooth wet web by transporting wet web; And
Elastic thread band, the second crush zone is transported through together with wet web by deflector roll, and make wet web level and smooth between the first flat roll and elastic thread band, first flat roll and the second flat roll are covered by hard coating, and the surface of the elastic thread band contacted with wet web does not have the smooth surface of the first flat roll
By making deflector roll reduce, described thread belt is pressed to described first flat roll.
5. the press section for paper machine according to claim 3 or 4, described hard coating has the hardness of JIS specification more than 99 °.
6. the press section for paper machine according to claim 3 or 4, described elastic thread band is the thread belt a little with air permeability.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP242662/06 | 2006-09-07 | ||
| JP2006242662A JP4721117B2 (en) | 2006-09-07 | 2006-09-07 | Wet paper smoothing method and paper machine press part |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101139807A CN101139807A (en) | 2008-03-12 |
| CN101139807B true CN101139807B (en) | 2015-08-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710149061.4A Active CN101139807B (en) | 2006-09-07 | 2007-09-07 | The smoothing method of wet web and the press section for paper machine |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4721117B2 (en) |
| CN (1) | CN101139807B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1050318A (en) * | 1975-06-03 | 1979-03-13 | Arnold J. Schmitt | Press section arrangement |
| JPH04101885A (en) * | 1990-08-22 | 1992-04-03 | Fuji Photo Film Co Ltd | Thermal recording material and preparation thereof |
| JP3540368B2 (en) * | 1994-06-24 | 2004-07-07 | 三菱重工業株式会社 | Press part of paper machine |
| JP3188115B2 (en) * | 1994-10-21 | 2001-07-16 | 三菱重工業株式会社 | Press machine for paper machine |
| FI955014A (en) * | 1995-10-20 | 1997-04-21 | Valmet Corp | Press section in a paper machine, where a long press is used |
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2006
- 2006-09-07 JP JP2006242662A patent/JP4721117B2/en active Active
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2007
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2008063694A (en) | 2008-03-21 |
| CN101139807A (en) | 2008-03-12 |
| JP4721117B2 (en) | 2011-07-13 |
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Effective date of registration: 20080620 Address after: Tokyo, Japan, Japan Applicant after: Oji Paper Co., Ltd. Address before: Tokyo, Japan Applicant before: MITSUBISHI Heavy Industry Corporation Co-applicant before: Oji Paper Co., Ltd. |
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Address after: Tokyo, Japan, Japan Applicant after: Oji Paper Co. Address before: Tokyo, Japan, Japan Applicant before: Oji Paper Co., Ltd. |
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