CN207031912U - A kind of roll-type top net former - Google Patents
A kind of roll-type top net former Download PDFInfo
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- CN207031912U CN207031912U CN201720897512.1U CN201720897512U CN207031912U CN 207031912 U CN207031912 U CN 207031912U CN 201720897512 U CN201720897512 U CN 201720897512U CN 207031912 U CN207031912 U CN 207031912U
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Abstract
The utility model discloses a kind of roll-type top net former, including top net, main format roll and multiple preforming rollers, along the conveying direction of l Water Paper page, multiple preforming rollers and main format roll are set gradually, multiple preforming rollers are below spacer screen, and main format roll is located at the online side in top；The online side in top corresponding to multiple preforming rollers is provided with suction box, and suction box is provided with multiple scrapers, and each scraper is correspondingly arranged with a preforming roller, and each scraper is in contact with top net surface.Its dewatering is after l Water Paper page enters l Water Paper page transfer passage, first pass through multiple preforming rollers and carry out multistage predrainage, moisture caused by multistage predrainage is taken out of by suction box, and then l Water Paper page is sent into main format roll with the rotation of top net and is dehydrated, and is taken out of after completing dehydration by spacer screen.The utility model can be such that the l Water Paper page extruding force into two network folder areas, the degree of crook of course gradually increases, so as to adapt to wider quantification range and velocity interval.
Description
Technical field
Pulp and paper technology field is the utility model is related to, more particularly to a kind of roll-type top net former.
Background technology
Traditional long mesh paper making machine is dehydrated by one side, so that the filler and fiber fines by wire side page are kept
Relatively low, the page wire side of formation is more positive coarse, causes the two sides difference of paper big.Meanwhile with the progress that wet end is dehydrated, pulp layer
Concentration improve constantly, it is poly- that the fiber in pulp layer starts wadding, and with the raising of concentration, and poly- degree of wadding a quilt with cotton also begins to aggravate, most
Cause the uniformity of paper surface poor eventually.
Some paper plants at present, in order to improve the paper-forming evenness of long mesh paper making machine, in addition to the head box selected, often through increasing
It is poor to improve the uniformity of paper surface and reduce two sides to add traditional wire table shaking or addition ornamenting roller, but its improvement is not
Substantially, and these methods can be used only on low speed paper machine.Once paper machine speed more than 250m/min, traditional wire table shaking and
The effect of ornamenting roller will be restricted.More importantly ornamenting roller does not possess the function of dehydration, using the fourdrinier part of ornamenting roller
It is still one side dehydration, it is impossible to fundamentally solve the problems, such as paper two sides difference, to improving formation of sheet and reducing two sides difference
Act on very little.Therefore, further to improve the paper quality of fourdriner forming, top net former is a kind of selection well.
Top net former refers to before wet web is shaped, and increases a forming net, wet web above long mesh paper making machine forming table
By being dehydrated paper web upper and lower surface, while by the extruding and hydraulic action between two layers of mesh, disperse fibre between two layers of mesh
Dimension wadding is poly-, reduces the fiber floc sedimentation in l Water Paper page, improves paper formation, and the two sides reduced in page structure is poor, bright so as to reach
The aobvious purpose for improving page quality.
The angle of traditional top net former, net clad roller or curved surface dehydration boots is fixed, therefore works as working condition
When changing, mass dryness fraction, thickness such as l Water Paper page may result in shaping and deteriorate when exceeding former scope of design.
Because along the dehydration boots or roller of heavy grade after the nips that the l Water Paper page that preliminary hydro-extraction is formed enters two nets
Surface curved motion suddenly, this curvilinear motion produce a kind of interior shearing effect inside page, and l Water Paper page is thicker, and inside should
Power is bigger.Two dewatering pressures that act on l Water Paper page of net extruding are directly proportional to the tension force of outer net, with radius of curvature into anti-
Than, i.e. P=T/R, P represents the pressure that l Water Paper page is subject in formula, and T represents the tension force of net, and R represents radius of curvature.
Limited by space, push up the radius of curvature very little of net former, therefore the extruding force acted on l Water Paper page is big too,
So that during production ground paper, too big dewatering pressure can damage fibrous layer, deteriorate properties of product, particularly strength character, also wrap
Printing performance is included, can break paper when serious.In addition when producing heavu weights, when entering nip, slurry can be extruded, and flow to two
Side and head box direction, also result in shaping and deteriorate.
It is above-mentioned in order to solve the problems, such as, in existing top net former, equipped with a variety of regulating measures, such as tension force of net, wet
Angle, spacer screen Wiper blade and the top net Wiper blade that page enters two network folder areas press to the depth of net, l Water Paper page enters two network folder areas
Concentration etc..But these regulating measures do not solve the above problems thoroughly, still occur due to roll-type when producing ground paper
Or dehydration boots radius of curvature is too small, the too big caused formation problems of two net extruding forces, while above-mentioned measure can also sacrifice top
The dewatering efficiency of net former.
Utility model content
The purpose of this utility model is overcome the deficiencies in the prior art, there is provided a kind of roll-type top net former, the top net
Former can make to enter the l Water Paper page extruding force of two network folder areas (pushing up the l Water Paper page transfer passage formed between net and spacer screen), OK
The degree of crook for entering route gradually increases, so as to adapt to wider quantification range and velocity interval.
The technical solution of the utility model is：A kind of roll-type top net former, including top net, main format roll and it is multiple it is pre- into
Type roller, top net push up and l Water Paper page transfer passage are formed between net and spacer screen above spacer screen；Along the conveying direction of l Water Paper page,
Multiple preforming rollers and main format roll are set gradually, and multiple preforming rollers are below spacer screen, and main format roll is located at the online side in top；
The online side in top corresponding to multiple preforming rollers is provided with suction box, and suction box is provided with multiple scrapers, each scraper and one in advance into
Type roller is correspondingly arranged, and each scraper is in contact with top net surface.Wherein, main format roll drives top net to turn with spacer screen as driven roller
It is dynamic.
Form a upper drying zone in the multiple preforming roller, at each preforming roller, each scraper on suction box
It is corresponding to be located in a upper drying zone；A lower drying zone is formed at main format roll.
In the multiple preforming roller, along the conveying direction of l Water Paper page, the radius of each preforming roller is gradually reduced, Ge Geshang
The dewatering pressure of drying zone gradually increases, and l Water Paper page transfer passage forms the curved surface that height is gradually reduced.By preliminary hydro-extraction again
Wet web dryness into two network folder areas is generally 1%~2.5%, now if using larger extruding force, then can cause wet
The adverse consequences such as page conquassation, using larger bent angle, then a kind of interior shearing effect is produced inside page, for thicker paper
Zhang Eryan, internal stress is very big, then can deteriorate the shaping of paper, influences the performance of paper.With the progress of dehydration, l Water Paper page
Mass dryness fraction is increasing, and l Water Paper page can bear bigger extruding force, while the mass dryness fraction of page is bigger, the thickness of paper when identical quantitative
It is smaller, so that also with regard to more imperial palace shearing force can be born, the shaping without influenceing paper.Therefore, along the conveying direction of l Water Paper page,
The de-watering extrusion power and dewatering time of multiple upper drying zones gradually increase, and the degree that paper deforms by bending also gradually increases, and has
Beneficial to the internal stress for reducing paper, paper performance is improved.
As a kind of preferred scheme, at least 3, the preforming roller, including set gradually along l Water Paper page conveying direction
Entrance format roll, the first intermediary form roller and the second intermediary form roller.Wherein, entrance format roll is located at two network folder areas and (pushes up net
The l Water Paper page transfer passage formed between spacer screen) porch；First intermediary form roller and the second intermediary form roller be located at into
Between mouth format roll and main format roll, typically using 2~4.Entrance format roll, the first intermediary form roller and the second intermediary form
Roller extrudes with two nets respectively, respectively forms a upward drying zone (i.e. above-mentioned upper drying zone), main format roll and two net extruding shapes
The drying zone (i.e. above-mentioned lower drying zone) downward into one.First intermediary form roller and the second intermediary form roller can be carried out
Lower regulation and Level tune, so as to wrap angle and l Water Paper page disengaging each preforming roller of the adjustable l Water Paper page on each preforming roller
Angle, and adjust top net press-in spacer screen depth, adjustment two nets to the extruding force of l Water Paper page and two net tension force, reach regulation
The distribution of wet end double side dewatering, Optimize the forming scheme, the purpose for improving evenness.
The radius of the entrance format roll is 250~400mm, and the wrap angle of entrance format roll is 5 °~10 °；
The radius of first intermediary form roller is 150~250mm, and the radius of the second intermediary form roller is 150~250mm, and
The radius of first intermediary form roller is more than the radius of the second intermediary form roller；
The wrap angle of first intermediary form roller is 10 °~15 °, and the wrap angle of the second intermediary form roller is 15 °~20 °, the
The wrap angle of one intermediary form roller is less than the wrap angle of the second intermediary form roller.
Therefore to a last intermediary form roller since entrance format roll, l Water Paper page be squeezed power dehydration time it is more next
It is longer.
The angle that spacer screen and l Water Paper page are formed into and out of entrance format roll is 165 °~175 °, and spacer screen and l Water Paper page are into and out of the
The angle of one intermediary form roller is 150 °~160 °, and the angle of spacer screen and l Water Paper page into and out of the second intermediary form roller is also 140 °
~150 °, pass in and out that the angle of format roll is bigger, then l Water Paper page deforms by bending degree and suffered interior shear stress with regard to smaller,
In the net former of this roll-type top, by setting multiple preforming rollers, progressively reduce the angle of l Water Paper page disengaging format roll, effectively subtract
The influence that small interior shear stress shapes to ground paper.After multiple upper drying zones, the mass dryness fraction of l Water Paper page reaches 8%~
12%, now page can bear larger extruding force and interior shear stress, therefore in lower drying zone l Water Paper page can have it is larger
The angle of wrap angle and the upper format roll of disengaging.
The suction box includes the multistage water storage casing being connected, and the series of casing is corresponding with the number of preforming roller,
The bottom of water storage casings at different levels is outward extended with weather board, and each weather board end is provided with a scraper；Adjacent two-stage water storage casing
Between be provided with through hole, along the conveying direction of l Water Paper page, the water storage casing positioned at afterbody is provided with discharge outlet.In the structure,
After water storage casings at different levels receive the moisture from weather board, along the conveying direction of l Water Paper page, by adjacent two-stage water storage casing it
Between through hole moisture is discharged into next stage water storage casing, until afterbody water storage casing after, paper machine is expelled to by discharge outlet
White water chest in.
In the suction box, along the conveying direction of l Water Paper page, the floor height of water storage casings at different levels gradually reduces, each water guide
Plate tilts down, i.e., is gradually reduced from scraper to water storage casing direction, the height of weather board, draining is play the guiding role.The suction
In cisten mechanism, the section of scraper is triangular in shape, is advantageous to push up striking off for net surface moisture positioned at the inclined-plane of its front end, positioned at it
The inclined-plane of rear end, which is advantageous to moisture being oriented to, to be led in weather board.The junction of weather board and water storage casing also is provided with through hole, uses
In moisture is discharged into water storage casing.
The output end of the main format roll is additionally provided with suction roller, and suction roller is located at below spacer screen, and suction roller is external vacuum
The vacuum furnace of pump.When two nets pass through suction roller, l Water Paper page is adhered on spacer screen, is moved on spacer screen into next workshop section, and
It will not be transferred with top net, so as to ensure the normal operation of paper machine.
The top net is circular top net, pushes up and guide-in roller, outlet roller are additionally provided with the inside of net, inhales fog chamber, later roller, school net roll
And idler roller, along top net cycle rotation direction, guide-in roller, main format roll, outlet roller, inhale fog chamber, later roller, school net roll and
Tight roller is sequentially arranged in the inner side of top net；Top net outside corresponding with inhaling fog chamber is additionally provided with high pressure water jet pipe.Wherein, at guide-in roller
Push up and the first angle is formed between net and spacer screen, the second angle, the angle of the first angle are formed between the top net and spacer screen at outlet roller
Very little is spent, generally 1~3 °, the angle of the second angle is relatively large.In actual production, it can be adjusted according to the process requirements of reality
The height of guide-in roller and outlet roller is saved, so as to adjust the angle of the first angle and the second angle.
In said apparatus structure, each part of composition top net former is fixedly installed in frame, is also set below spacer screen
There is white wate tray, for accepting moisture caused by each drying zone (mainly descending drying zone).In the former structure, by preliminary de-
The l Water Paper page of water enters the nip of top net and spacer screen, first passes through entrance format roll, the first intermediary form roller, the second intermediary form roller
Run to the bottom of main format roll downwards, run then up to suction roller, l Water Paper page and continue to move ahead with spacer screen, annular top net
Then pass through outlet roller, suction fog chamber, later roller, school net roll, idler roller and guide-in roller are recycled into the nip of two nets.
The dewatering that above-mentioned roll-type top net former is realized is：L Water Paper page enters between top net and spacer screen the l Water Paper formed
After page transfer passage, first pass through multiple preforming rollers and carry out multistage predrainage, moisture is by suction box band caused by multistage predrainage
Go out, then l Water Paper page is sent into main format roll with the rotation of top net and is dehydrated, and is taken out of after completing dehydration by spacer screen.
This roll-type top net former and its dewatering are in use, its principle is：In running, guide-in roller is adjusted first
And outlet roller, the angle of adjustment l Water Paper page disengaging top net；Then it is each according to paper machine speed, the requirement of quantitative and paper sheet thickness, regulation
The position of individual intermediary form roller and main format roll, after l Water Paper page is entered l Water Paper page transfer passage, along the conveying direction of l Water Paper page,
The dewatering time of each drying zone (including each upper drying zone and lower drying zone) and the degree of crook of advance route are with l Water Paper page
The raising of mass dryness fraction and gradually increase, the de-watering extrusion power suffered by l Water Paper page also gradually increases, so that l Water Paper page passes through two nets
Can be in tolerance range, the shaping and final paper that will not destroy page be produced for suffered extruding force and interior shear stress during nip
Product energy.
The utility model has the advantages that relative to prior art：
This top net former and its dewatering in the joint of top net and spacer screen by setting multiple preforming rollers and master
Format roll, be correspondingly formed multiple upper drying zones and lower drying zone, using gradually incremental dewatering pressure, extrusion time and gradually to
Under degree of crook, multistage dehydration is carried out to l Water Paper page, so that extruding force suffered when l Water Paper page is by two network folder areas and interior
Shear stress in tolerance range, can advantageously reduce the internal stress of l Water Paper page, improve paper performance, l Water Paper page is fitted
Quantification range that should be wider.Meanwhile this top net former is dehydrated using gradual roll-type, slow down the speed of wet paper sheet dehydration forming
Degree, it can preferably meet the production requirement of heavu weights.
In the net former of this top, regulating measure is more, can not only adjust guide-in roller, outlet roller and main format roll, moreover it is possible to adjust
Save the position of each preforming roller, using flexible, strong adaptability.
Brief description of the drawings
Fig. 1 is the principle schematic of this roll-type top net former.
Fig. 2 is the partial enlarged drawing of each preforming roller in Fig. 1.
Fig. 3 is the structural representation of suction box in Fig. 1.
Embodiment
With reference to embodiment, the utility model is described in further detail, but embodiment of the present utility model
Not limited to this.
Embodiment
A kind of roll-type top net former of the present embodiment, as shown in figure 1, preforming including top net 14, main format roll 5 and three
Roller (being respectively entrance and format roll 2, the first intermediary form roller 3 and the second intermediary form roller 4), top net is located at the top of spacer screen 15,
And l Water Paper page transfer passage 16 is formed between top net and spacer screen；Along the conveying direction (as shown in single arrow in Fig. 1) of l Water Paper page,
Three preforming rollers and main format roll are set gradually, and three preforming rollers are below spacer screen, and main format roll is located at the online side in top；
The online side in top corresponding to three preforming rollers is provided with suction box 1, and suction box is provided with multiple scrapers, each scraper and one in advance into
Type roller is correspondingly arranged, and each scraper is in contact with top net surface.Wherein, main format roll drives top net to turn with spacer screen as driven roller
It is dynamic.Form a upper drying zone at each preforming roller, each scraper on suction box is corresponding in a upper drying zone；It is main
A lower drying zone is formed at format roll.Entrance format roll, the first intermediary form roller and the second intermediary form roller are defeated along l Water Paper page
Direction is sent to set gradually, entrance format roll is located at two network folder areas (pushing up the l Water Paper page transfer passage formed between net and spacer screen)
Porch；First intermediary form roller and the second intermediary form roller between entrance format roll and main format roll, typically using 2~
4.Entrance format roll, the first intermediary form roller and the second intermediary form roller extrude with two nets respectively, it is each formed one it is upward
Drying zone (i.e. above-mentioned upper drying zone), main format roll and two net extruding form a downward drying zone (i.e. above-mentioned lower dehydration
Area).First intermediary form roller and the second intermediary form roller can carry out regulation and Level tune up and down, so as to adjustable l Water Paper
Wrap angle and l Water Paper page of the page on each preforming roller pass in and out the angle of each preforming roller, and adjust the depth of top net press-in spacer screen
Degree, two nets of adjustment reach the distribution of regulation wet end double side dewatering, Optimize the forming scheme, changed to the extruding force of l Water Paper page and two tension force netted
The purpose of kind evenness.
In three preforming rollers, along the conveying direction of l Water Paper page, the radius of each preforming roller is gradually reduced, each upper dehydration
The dewatering pressure in area gradually increases, and l Water Paper page transfer passage forms the curved surface that height is gradually reduced.Entered back into by preliminary hydro-extraction
The wet web dryness in two network folder areas is generally 1%~2.5%, now if using larger extruding force, then can cause l Water Paper page
The adverse consequences such as conquassation, using larger bent angle, then a kind of interior shearing effect is produced inside page, for thicker paper
Speech, internal stress is very big, then can deteriorate the shaping of paper, influences the performance of paper.With the progress of dehydration, the mass dryness fraction of l Water Paper page
Increasing, l Water Paper page can bear bigger extruding force, while the mass dryness fraction of page is bigger, and the thickness of paper is got over when identical quantitative
It is small, so that also with regard to more imperial palace shearing force can be born, the shaping without influenceing paper.Therefore, it is more along the conveying direction of l Water Paper page
The de-watering extrusion power and dewatering time of individual upper drying zone gradually increase, and the degree that paper deforms by bending also gradually increases, favorably
In the internal stress for reducing paper, paper performance is improved.
As shown in Fig. 2 the radius R1=250mm, the radius R2=200mm of the first intermediary form roller, the of entrance format roll
The radius R3=150mm of two intermediary form rollers, the radius of each format roll are the radius of curvature of two nets dehydration, due to squeezing for dehydration
Pressure P=T/R, when the tension force T of net is constant, R is smaller, and the extruding force of two net dehydrations is bigger, therefore along the conveying side of l Water Paper page
To the de-watering extrusion power of each upper drying zone is increasing.A=5 ° of the wrap angle of entrance format roll, the first intermediary form roller
B=10 ° of wrap angle, C=15 ° of the wrap angle of the second intermediary form roller, therefore be squeezed along the conveying direction of l Water Paper page, l Water Paper page
The time of power dehydration is increasingly longer.L Water Paper page is into and out of a=170 ° of angle at entrance format roll, and l Water Paper page is into and out of among first
B=160 ° of angle at format roll, l Water Paper page is into and out of c=150 ° of angle at the second intermediary form roller, into and out of format roll
Angle is bigger, then l Water Paper page deforms by bending degree and suffered interior shear stress, should so as to reduce interior shearing with regard to smaller
The influence that power shapes to ground paper.After three upper drying zones, the mass dryness fraction of l Water Paper page reaches 8%~12%, now l Water Paper page
Larger extruding force and interior shear stress can be born, therefore in lower drying zone, l Water Paper page can have larger wrap angle and enter,
Go out the angle of main format roll.
Process requirements in actual production, above-mentioned each data can also be selected and adjusted in following scope：Entrance
The radius of format roll is 250~400mm, and the wrap angle of entrance format roll is 5 °~10 °；The radius of first intermediary form roller is
150~250mm, the radius of the second intermediary form roller is 150~250mm, and the radius of the first intermediary form roller is more than in second
Between format roll radius；The wrap angle of first intermediary form roller is 10 °~15 °, the wrap angle of the second intermediary form roller for 15 °~
20 °, the wrap angle of the first intermediary form roller is less than the wrap angle of the second intermediary form roller；Spacer screen and l Water Paper page into and out of entrance into
The angle that type roller is formed is 165 °~175 °, and the angle of spacer screen and l Water Paper page into and out of the first intermediary form roller is 150 °~160 °,
Spacer screen and l Water Paper page are also 140 °~150 ° into and out of the angle of the second intermediary form roller, and it is bigger to pass in and out the angle of format roll, then wet
Degree that page deforms by bending and suffered interior shear stress are multiple by setting in the net former of this roll-type top with regard to smaller
Preforming roller, progressively reduce the angle of l Water Paper page disengaging format roll, effectively reduce the influence that interior shear stress shapes to ground paper.
After multiple upper drying zones, the mass dryness fraction of l Water Paper page reaches 8%~12%, and now page can bear larger extruding force and interior
Shear stress, therefore l Water Paper page can have the angle of larger wrap angle and the upper format roll of disengaging in lower drying zone.
In the roll-type top net former of said structure, as shown in figure 3, suction box 1 includes the multistage water storage casing being connected
1-1, the series of casing is corresponding with the number of preforming roller, and the bottom of water storage casings at different levels is outward extended with weather board 1-2, respectively
Weather board end is provided with a scraper 1-3；Through hole 1-4 is provided between adjacent two-stage water storage casing, along the conveying direction of l Water Paper page,
Water storage casing positioned at afterbody is provided with discharge outlet 1-5.In the structure, water storage casings at different levels receive the water from weather board
After point, along the conveying direction of l Water Paper page, moisture is discharged into by next stage storage tank by the through hole between adjacent two-stage water storage casing
In body, until after afterbody water storage casing, it is expelled to by discharge outlet in the white water chest of paper machine.In suction box, along l Water Paper page
Conveying direction, the bottom surface 1-6 height of water storage casings at different levels gradually reduce, and each weather board tilts down, i.e., from scraper to storage tank
Body direction, the height of weather board are gradually reduced, draining are play the guiding role.In the water suction box structure, the section of scraper is in triangle
Shape, be advantageous to push up striking off for net surface moisture positioned at the inclined-plane of its front end, be advantageous to moisture being oriented to positioned at the inclined-plane of its rear end
Lead in weather board.The junction of weather board and water storage casing also is provided with through hole, for moisture to be discharged into water storage casing.
As shown in figure 1, the output end of main format roll is additionally provided with suction roller 6, suction roller is located at below spacer screen, and suction roller is outer
Connect the vacuum furnace of vavuum pump.When two nets pass through suction roller, l Water Paper page is adhered on spacer screen, is moved on spacer screen into next work
Section, without being transferred with top net, so as to ensure the normal operation of paper machine.
Top net is circular top net, pushes up and guide-in roller 13, outlet roller 7 are additionally provided with the inside of net, inhales fog chamber 9, later roller 10, school net
Roller 11 and idler roller 12, along the cycle rotation direction of top net, guide-in roller, main format roll, outlet roller, later suction fog chamber, roller, school net
Roller and idler roller are sequentially arranged in the inner side of top net；Top net outside corresponding with inhaling fog chamber is additionally provided with high pressure water jet pipe 8.Wherein, lead
Enter and the first angle is formed between top net and spacer screen at roller, form the second angle between the top net and spacer screen at outlet roller, first
The angle very little of angle, generally 1~3 °, the angle of the second angle is relatively large., can be according to the work of reality in actual production
Skill demand adjusts the height of guide-in roller and outlet roller, so as to adjust the angle of the first angle and the second angle.
In said apparatus structure, each part of composition top net former is fixedly installed in frame, is also set below spacer screen
There is white wate tray, for accepting moisture caused by each drying zone (mainly descending drying zone).In the former structure, by preliminary de-
The l Water Paper page of water enters the nip of top net and spacer screen, first passes through entrance format roll, the first intermediary form roller, the second intermediary form roller
Run to the bottom of main format roll downwards, run then up to suction roller, l Water Paper page and continue to move ahead with spacer screen, annular top net
Then pass through outlet roller, suction fog chamber, later roller, school net roll, idler roller and guide-in roller are recycled into the nip of two nets.
The dewatering that above-mentioned roll-type top net former is realized is：L Water Paper page enters between top net and spacer screen the l Water Paper formed
After page transfer passage, first pass through multiple preforming rollers and carry out multistage predrainage, moisture is by suction box band caused by multistage predrainage
Go out, then l Water Paper page is sent into main format roll with the rotation of top net and is dehydrated, and is taken out of after completing dehydration by spacer screen.
This roll-type top net former and its dewatering are in use, its principle is：In running, guide-in roller is adjusted first
And outlet roller, the angle of adjustment l Water Paper page disengaging top net；Then it is each according to paper machine speed, the requirement of quantitative and paper sheet thickness, regulation
The position of individual intermediary form roller and main format roll, after l Water Paper page is entered l Water Paper page transfer passage, along the conveying direction of l Water Paper page,
The dewatering time of each drying zone (including each upper drying zone and lower drying zone) and the degree of crook of advance route are with l Water Paper page
The raising of mass dryness fraction and gradually increase, the de-watering extrusion power suffered by l Water Paper page also gradually increases, so that l Water Paper page passes through two nets
Can be in tolerance range, the shaping and final paper that will not destroy page be produced for suffered extruding force and interior shear stress during nip
Product energy.
As described above, the utility model can be realized preferably, above-described embodiment is only preferably implementation of the present utility model
Example, not it is used for limiting practical range of the present utility model；I.e. all equivalent changes and modifications made according to the utility model content,
All covered by the utility model claims scope claimed.
Claims (9)
1. a kind of roll-type top net former, it is characterised in that including top net, main format roll and multiple preforming rollers, top net is located at
Above spacer screen, and push up and l Water Paper page transfer passage is formed between net and spacer screen；Along the conveying direction of l Water Paper page, multiple preforming rollers and
Main format roll is set gradually, and multiple preforming rollers are below spacer screen, and main format roll is located at the online side in top；Multiple preforming rollers pair
The top answered just is provided with suction box on the net, and suction box is provided with multiple scrapers, and each scraper is correspondingly arranged with a preforming roller, respectively
Scraper is in contact with top net surface.
2. a kind of roll-type top net former according to claim 1, it is characterised in that in the multiple preforming roller, each
Form a upper drying zone at preforming roller, each scraper on suction box is corresponding in a upper drying zone；Main format roll
Place forms a lower drying zone.
3. a kind of roll-type top net former according to claim 2, it is characterised in that in the multiple preforming roller, along wet
The conveying direction of page, the radius of each preforming roller are gradually reduced, and the dewatering pressure of each upper drying zone gradually increases, l Water Paper page
Transfer passage forms the curved surface that height is gradually reduced.
4. a kind of roll-type top net former according to claim 1, it is characterised in that at least 3, the preforming roller, bag
Include the entrance format roll set gradually along l Water Paper page conveying direction, the first intermediary form roller and the second intermediary form roller.
5. a kind of roll-type top net former according to claim 4, it is characterised in that the radius of the entrance format roll is
250~400mm, the wrap angle of entrance format roll is 5 °~10 °；
The radius of first intermediary form roller is 150~250mm, and the radius of the second intermediary form roller is 150~250mm, and first
The radius of intermediary form roller is more than the radius of the second intermediary form roller；
The wrap angle of first intermediary form roller is 10 °~15 °, and the wrap angle of the second intermediary form roller is 15 °~20 °, in first
Between format roll wrap angle be less than the second intermediary form roller wrap angle.
6. a kind of roll-type top net former according to claim 1, it is characterised in that the suction box is more including being connected
Level water storage casing, the series of casing is corresponding with the number of preforming roller, and the bottom of water storage casings at different levels is outward extended with water guide
Plate, each weather board end are provided with a scraper；Through hole is provided between adjacent two-stage water storage casing, along the conveying direction of l Water Paper page,
Water storage casing positioned at afterbody is provided with discharge outlet.
7. a kind of roll-type top net former according to claim 6, it is characterised in that in the suction box, along l Water Paper page
Conveying direction, the floor height of water storage casings at different levels gradually reduce, and each weather board tilts down.
8. a kind of roll-type top net former according to claim 1, it is characterised in that the output end of the main format roll is also set
There is suction roller, suction roller is located at below spacer screen, and suction roller is the vacuum furnace of external vavuum pump.
9. a kind of roll-type top net former according to claim 1, it is characterised in that the top net is circular top net, pushes up net
Inner side be additionally provided with guide-in roller, outlet roller, inhale fog chamber, later roller, school net roll and idler roller, along top net cycle rotation direction,
Guide-in roller, main format roll, outlet roller, inhale fog chamber, later roller, school net roll and idler roller be sequentially arranged in top net inner side；With inhaling mist
Net outside in top is additionally provided with high pressure water jet pipe corresponding to case.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720897512.1U CN207031912U (en) | 2017-07-20 | 2017-07-20 | A kind of roll-type top net former |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720897512.1U CN207031912U (en) | 2017-07-20 | 2017-07-20 | A kind of roll-type top net former |
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| CN207031912U true CN207031912U (en) | 2018-02-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107419584A (en) * | 2017-07-20 | 2017-12-01 | 华南理工大学 | A kind of roll-type top net former and its dewatering |
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2017
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107419584A (en) * | 2017-07-20 | 2017-12-01 | 华南理工大学 | A kind of roll-type top net former and its dewatering |
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