CN102666982A - Dry end web transport system - Google Patents

Abstract

The invention relates to a system for transporting a fibre web (47) through a dry end of a fibre web processing machine from a drying section (1) to a reeling section (2) of the machine. According to the invention, the system comprises one or a plurality of groups of air modules, wherein each group of air modules is arranged for supplying and evacuating air from a predetermined, localized zone along the web run of the dry end, and wherein each group of air modules comprises at least one air supply module (9) being arranged for supplying air to the localized zone; and at least one air exhaust module (10) being arranged for evacuating air from the localized zone, wherein the air flow-rate of said at least one air supply module is balanced by the air flow-rate of said at least one air exhaust module such that dust-laden air is prevented from escaping the localized zone by other means than through said at least one air exhaust module.

Description

Dry end paper web induction system

The present invention relates to a kind of system that is used for fibrous web being transported to from the drying section of said machine its reeling end by the dry end of fibrous web (fibre web) handling machine.Particularly, the present invention relates to this system in tissue machine.

The invention still further relates to the air feed module and the exhaust module that are used in this system.

The invention still further relates to the method that prevents the regional area in the dust-loaded air effusion fibrous web handling machine dry end.

With regard to the dry end of tissue machine, the conventional method of control paper web (web) and entrained dirt is disappointed.Conventional method is a several layers solution.Each new successive soln (layer) all is designed out, and not exclusively reappraises the successive soln of having accomplished before this.

The present invention relates to the detailed description of such dry end design, this dry end design has effectively integrated the critical process and the target of the dry end of thin paper or paper handkerchief level machine when using new technology and existing technology.

This paper has comprised the of the present invention many aspects that can be used as self-contained unit or technology.Yet these devices or technology are more valuable when being used in combination.

The target that page or leaf open to be handled comprises that page or leaf opens stability, page or leaf effectively the carrying secretly of wrinkling reservation and dust in opening.The present invention has satisfied these demands.

According to the present invention, paid close attention to the balance of air flow.Air not only is discharged from critical positions, and is supplied at key position.

Empirical evidence needs the system of intensive or complicated maintenance to safeguard and ultimate failure owing to lacking the most at last.This type of new system is designed with minimum maintenance requirement.The automation cleaning device is bonded in this new system as required.

Most of known control dirt strategies are all based on following prerequisite: can not deflate from too close paper web.Most of pages or leaves are opened the scheme that deals with all based on " make page or leaf open stabilisation, and do not worry dust ".

The conventional strategy that uses up to now is the conjecture that is based upon on the illusion basis to a great extent.

The gluing at scanner, reel place (glue turn-up), trailing edge paper injection, page or leaf open abate spray thrower (sheet knockdown shower), roll etc. with page or leaf open handle and the critical component integrated degree of dust control relatively poor.

Therefore, prior art has following shortcoming:

Paper web is unstable.Tractive force can not reduce.

Dust leaks serious, although real need much more of the air ratio of supply and discharge.Dust levels is unpredictable and must utilize the machine chamber dust levels of " unreliable " (hit or miss) to guarantee.

The suction tank of various types of dust arresters is blocked.

Existence is by dropping into the web breaks that the dust piece on the paper web causes from paper tinsel and beam.

Machine operation person's input, maintenance and operation cost are higher.

The FAQs that is associated with conventional system is to open instability along the page or leaf of the edge appearance of a page or leaf stream (sheet run).This is that inlet air flow causes.

Inlet air flow is the dust of having a mind to and be intended to be used for carrying secretly machine.Regrettably, inlet air flow can cause the edge unstable.In the zone that paper web is not supported, this inside speed can not exceed the size of 100ft/min (0.5m/s) usually.

Inlet air flow will be present in some zone that does not have dust arrester.When paper web left creping doctor or leaves mangle, air was pumped by the paper web boundary layer and air must get into machine side surface to compensate.In this case, only can make the paper web instability problem more serious from this regional exhaust.

In the zone such as mangle inlet or reel introducing place, air is pushed out the side of machine.Lower entraining velocity is not enough.

Another common problem is that conventional pulper (pulper) gas extraction system is oversize.Trial is carried secretly with high exhaust flow rate.In many cases, when condition changed, mist and steam still can be overflowed.Conventional system is a high energy consumption.

Another important problem is the cleaning of paper web.There is various available thin paper level paper web cleaner.These cleaners all need be retrofitted in the machine, and also do not have a complete method conceptive.One or more problems of enumerating below all known existing types all possibly have:

1. exhaust stream is attempted to suck paper web and/or paper web is passed in the air suction.

Discharge point from paper web too far possibly preventing that paper web is inhaled into, but the shortcoming that exists required exhaust flow rate to increase.

3. design is too complicated.

4. the exhaust suction tank is too narrow, and this can cause stopping up.

5. thereby exist the direct friction paper web to form the sharp edges of dust.

6. do not exist or exist hardly and can be applied to the scouring nozzle exit pressure on the paper web.

7. the inner passage that has many easy obstructions and be difficult to clean, this unit.

8. this unit can not support paper web well.

In many cases, machine run soon will be blocked, and finally need machine operation person to remove padding.No matter whether machine turns round, all there is the effect that prevents that dust and chip from getting into the nip at reel place hardly.This makes any effort of paper web cleaning aspect become futile.

The objective of the invention is to alleviate these problems.

System according to the present invention is characterised in that; It comprises one or more groups air module; Wherein every group of air module is arranged and is used for the paper web that longshore current goes out dry end and deflates to predetermined regional area supply air with from predetermined regional area, and wherein every group of air module comprises:

-at least one air feed module, it is arranged and is used to supply air to regional area; With

-at least one exhaust module, it is arranged and is used for deflating from regional area,

Wherein, the air rate of said at least one air feed module is by the air rate balance of said at least one exhaust module, thereby prevents that dust-loaded air from not being through said at least one exhaust module but by alternate manner effusion regional area.

Characterize through the following step according to the method for the invention:

-at least one air feed module is placed in the regional area;

-at least one exhaust module is placed in the regional area; And

The air rate of said at least one the air feed module of-balance and the air rate of said at least one exhaust module make the air rate of said at least one exhaust module equal the air rate of said at least one air feed module at least.

Usually, carry the problem that is associated to relate to following technical field with paper web in the dry end of conventional tissue machine: the manipulation of the manipulation in the boundary layer on the translational surface, compregnate portion, the manipulation of straight line free jet, initiatively the gas paper tinsel, by the paper tinsel of taking offence, page or leaf open that tensioning is considered, the carrying secretly and remove of the extension of tissue paper web, dust, humidifying is cleaned and in the maintenance problem at pulper place.

To discuss some in these fields below in more detail.

Boundary layer on the translational surface

Translational surface delivers air with it.There are theoretical correlation that can be used for laminar flow and the experience correlation that can be used for turbulent flow.Used correlation is derived from and relates to the correlation that derives to the application of static plate and moving air stream, and is adapted at using in the given structure.In typical application, most boundary layer air are very near translational surface.

Compregnate portion

When the roller of two rotations contacted, there was the high-pressure area in the closed nip place between roller.Boundary layer air is carried to the nip zone from the surface of two rollers.Bigger roller will have stronger boundary layer flow naturally.The jet of air leaves nip.The average angle of this jet receives the influence of the relative size of two boundary layer flows.

Can influence the size of this arbitrary boundary layer flow through the flow that uses the straight line spray nozzle of the gas supply to increase arbitrary boundary layer flow.Like this, can change the angle of the air-spray that leaves nip.When a roller carries clean boundary layer and another roller when having the boundary layer of entrained dirt or chip, this is useful.Through increasing the flow of clean boundary layer flow, can prevent that dust or chip from getting into nip.

The straight line free jet

The straight line free jet is the air-spray that the groove from the surface vertically occurs.

The correlation that scientist announced of utilization such as Baturin, Nielson and Rajaratnam can be confirmed the many significant variables relevant with the straight line free jet, for example, stretches angle, core length field, length of transition zone and profile similarity section length.

The straight line free jet can be used for gas curtain.Some key issues of consider comprise:

Jet will cause moving of adjacent air.Therefore, volume flow increases.High more effluxvelocity causes big more initiation flow.

When the distance to the jet limit increased, the maximal rate of this jet reduced.

Beyond the profile similarity district, be difficult to predict flow pattern.For gas curtain, the effective range of gas curtain is in the profile similarity district.

Efficient roughly with square being directly proportional of nozzle velocity.

Active paper tinsel and passive paper tinsel

The paper tinsel that comprises this nozzle is called as initiatively gas paper tinsel: this nozzle discharges air along the paper tinsel surface on the direction of the paper web of advancing, so that make paper web stable.The paper tinsel that lacks this nozzle is called as passive paper tinsel.Passive paper tinsel is modal in the industry.Low and the scalable of passive paper tinsel cost.

Dull and stereotyped at the less winding angle of edge and forward position place dependence thereafter, adhere on it to guarantee paper web.

Ahead of the curve with the back along on the dust that gathers fall with tending to bulk.This causes web breaks usually.Dirt accumulation on the forward position is owing to the compacting of the dust granule in the dust-loaded boundary layer that is derived from the paper web top and the paper tinsel upper reaches.The back derives from the dust-loaded air that sucks this zone at Hou Yanchu along last dust granule, and at Hou Yanchu, the boundary layer of paper web causes air to be inhaled into.The dust granule that gathers ahead of the curve tends to smaller, because in air-flow, have bigger acceleration and the separation of the increase that therefore caused by compacting.

The end face of paper web is exposed to allow the pressure of paper tinsel upstream and downstream to discharge.This causes the dust of paper web top to discharge.In conventional configurations, dust is released between paper tinsel.

The limited length on paper tinsel surface on the paper web direct of travel, this is because air gathers between paper web and paper tinsel.Paper web is maintained at the downside of paper tinsel, and this is owing to the low-pressure that on the paper tinsel surface, produces owing to moving of paper web.Paper web also owing to paper tinsel forward position and back along on the relevant page Zhang Zhangli of coiling thing be held paper tinsel.The paper web permeability helps air between paper web and paper tinsel, to gather.

Allow paper tinsel length (in the vertical) to increase along with following factors:

The increase of page or leaf Zhang Zhangli;

The increase of winding angle;

The increase of machine rotational speed;

The small radii in forward position; And

Lower paper web permeability.

Because friction, passive paper tinsel will produce resistance on paper web, the page or leaf Zhang Zhangli requirement that this resistance causes increasing.

The page or leaf Zhang Zhangli that increases requires to cause the resistance that increases on the passive paper tinsel.

Page or leaf Zhang Zhangli considers

Can predict the page or leaf Zhang Zhangli of a whole page or leaf stream.Page or leaf is opened treatment system must be designed such that a whole page or leaf page or leaf Zhang Zhangli who flows changes within the acceptable range.

Page or leaf Zhang Zhangli depends on the position in dry end and changes.

If at the overtension of any specific location, then will form wrinklingly, perhaps worse, paper web will be torn.If tension force is too small, then paper web falls with local sagging or from paper tinsel.

Following factors also influences a page or leaf Zhang Zhangli along path load application on paper web of paper web:

The paper web that gas paper tinsel nozzle " propelling " moves.

Passive paper tinsel will " pull " paper web owing to friction.

The weight that page or leaf is opened produces certain tension force.

In adjacent air, there is aerodynamic drag.

Instance below considering.Page or leaf is opened the starting point of stream at the creping doctor place.The place, end that paper web is opened stream at page or leaf is spurred by reel.Passive paper tinsel pulls paper web, and initiatively paper tinsel advances paper web simultaneously.Therefore, need have at page or leaf Zhang Liuzhong and locate passive paper tinsel and paper tinsel initiatively tactfully.

Opening stream starting point place at page or leaf, to assemble the result of too many passive paper tinsel be that the page or leaf Zhang Zhangli in passive paper tinsel downstream will become excessive.

Open the page or leaf Zhang Zhangli that to assemble the too many initiatively result of paper tinsel be initiatively paper tinsel downstream of stream starting point place at page or leaf and will become too small.The page or leaf that this structure also possibly cause page or leaf to open stream starting point place is opened overtension.

The coefficient of friction that friction load on the passive paper tinsel can use experiment to confirm is predicted." promotion " by the active paper tinsel provides can use definite correction factor of experiment and simple energy balance to predict.

Be necessary for passive paper tinsel and select suitable position,, tension force is kept within the acceptable range so that realize favourable tension force in some position with initiatively paper tinsel is careful.Preferably, initiatively paper tinsel and passive paper tinsel are opened stream along page or leaf and alternately are provided with.

Suppose web properties homogeneous in the horizontal, and ignore disadvantageous air flow that then the cross directional variations of a page or leaf stability can be owing to the cross directional variations of page or leaf Zhang Zhangli.When page or leaf Zhang Zhangli was big inadequately at the machine center place, paper web was lax at the machine center place.This is called as " sagging ".Locate too laxly on the edge of when web tension, then be called as " edge vibration ".

The edge vibration is also caused by the cross directional variations of disadvantageous air flow or web properties.

Page or leaf is opened the influence that tension curve receives crepe ratio.Spool velocity (crepe ratio) changes will make the tension curve offset of vertical.

Friction load on the passive paper tinsel partly is the function of page or leaf Zhang Zhangli.

To cause higher friction load on the paper tinsel near the reel place owing to the increase page or leaf Zhang Zhangli of the crepe ratio that reduces.Certainly, the mass flow of paper web does not change with change in location.Paper web plays the effect of straight line tension spring.The speed of paper web changes with the variation of page or leaf Zhang Zhangli or position.

Page or leaf Zhang Zhangli influences the flowability of product quality and dry end.In the design of paper tinsel, must consider page or leaf Zhang Zhangli.

The carrying secretly and removing of dust

Air transports dust.When considering in pipeline, to carry dust, will be understood that this point.

Consider to have a bit of pipeline of entrance and exit.The air of certain volume flow is used to the dust with minimum delivery speed delivery certain mass flow.Dust and air get into pipeline one end.Identical dust and air leave from the pipeline other end.

Near the tissue paper web of considering now in tissue machine, to move dust point source.Exist following key to consider effectively to take away dust:

Enough delivery speed must be arranged through latter.

Suction tank must be enough big, so that it can not stop up.

Suction tank must not be highly susceptible to sucking page or leaf and open or broken (broke).

Must there be the device that is used to clean suction tank.

Problem in the past is almost not consider the source of air.Iff then can suck paper web from extracting the air of aequum near the paper web out.If it is stable to guarantee paper web to reduce air flow, then can not capture all dusts.Paper web is permeable, but it does not have enough permeability.

Method commonly used is to open the stream over top at page or leaf hood to be installed and around page or leaf is opened stream, enough entraining velocities to be provided.Yet it is a problem all the time that page or leaf is opened edge stability.In the edge of the paper web that moves, there is restriction to inside speed.This lower entraining velocity is not enough to resist the air flow that produces usually in the dry end.This also causes high extraction flow requirement, and this is a kind of waste of the energy.

The solution of this problem is the air flow of strategically introducing the air that is drawn out of and considering to exist owing to the surface of moving.Need extract out with dust to the certain air of latter supply and with these air.Air just is used to transport the instrument of dust.Must there be balance.

The present invention handles paper web and dust control rises to new level.Except the extraction of control air, the supply of air also is controlled, and since the natural air stream that translational surface produces advantageously handled or be considered.

Carry secretly at the pulper place

From the purpose of pulper exhaust is to overflow from pulper in order to prevent that big damp-heat air from steeping.Required pulper exhaust flow rate is not only relevant with the volume flow rate of the steam that is discharged by the hot slurry that stirs.

Be difficult to predict near the air flow pattern the opening of pulper floor.Conventional pulper gas extraction system on the floor opening part realized the downward air velocity of appropriateness.It is difficult to overcome other appreciable impact, for example:

Buoyancy;

Air flow by pulper abate spray thrower (knockdown shower) and the initiation of dilution spray thrower;

Air flow by the initiation of the stream of the slurry in the pulper;

Get into the leftover pieces system exhaust of pulper; And

The air flow that causes by the whole width paper web of entering pulper under machine rotational speed.

Above-mentioned influence is passed in time and is changed.Conventional solution has to make the pulper gas extraction system oversize.This air bump rinse operation that causes wasting requires and unnecessary machine chamber auxiliary air requirement.

The buoyancy that acts on the moist pulper air must be by the downward speed offset of the air of floor opening part.

Do not consider that the local high air speed that caused by various forced air flow, buoyancy are must controlled principal element.In theory, if there is not the air that force to get into pulper, and pulper seals fully, then do not need discharging, because air will reach capacity, and no longer includes water vapour and is released from slurry or spray thrower.

Required pulper exhaust changes according to operating condition.Must consider following two kinds of steady-state conditions:

Ordinary production

Opening part is directed to pulper to paper web on Yang Ji cylinder floor.

The pulper exhaust flow rate must satisfy this two conditions.With regard to the pulper exhaust flow rate requires, when the worst situation appears at paper web and is imported into pulper.This with air is entered pulper and relies on the pulper exhaust to take away air basic identical.When paper web when the Yang Ji cylinder is imported into pulper, this paper web is in its both sides delivery boundary layer air.This additional air flow possibly be enough to overcome the flow rate of carrying secretly of expectation, and possibly take place from the phenomenon of the excessive slurry of pulper opening.

Following expression has gathered the various contributions for the required pulper exhaust flow rate of conventional system.

Q _pulper=Q _containment+Q _vapour+Q _trim+Q _{boundary?layer?air}

Q _Containment: realize that at (a plurality of) floor opening part that gets into pulper entraining velocity is to offset the required air rate of buoyancy effect.

Q _Vapour: the flow rate of the water vapour that produces from the pulper liquid level.

Q _Trim: the air rate that gets into pulper from other source of transporting system such as leftover pieces.

Q _{Boundary layer air}: when paper web under the machine rotational speed when the Yang Ji cylinder is transferred to pulper, be carried to the flow rate of the air in the pulper with paper web.

The generation of water vapour

Flow rate owing to the water vapour in the pulper of water evaporation can use many methods to be similar to.Compare other contribution factor when confirming required pulper exhaust flow rate, the flow rate of water vapour is quantitatively very little.

Hereinafter, will combine accompanying drawing to come open the present invention, in the accompanying drawings:

Fig. 1 illustrates the dry end that comprises according to the tissue machine of dry end paper web induction system of the present invention;

Fig. 2 to 6 illustrates spray nozzle of the gas supply according to an aspect of the present invention;

Fig. 7 and 8 illustrates adjacent gas paper tinsel according to an aspect of the present invention;

Fig. 9 illustrates the exhaust module with automatically cleaning air discharge duct according to an aspect of the present invention;

Figure 10 to 12 illustrates the exhaust module with automatically cleaning air discharge duct according to another aspect of the present invention;

Figure 13 illustrates dry end hood according to an aspect of the present invention;

Figure 14 and 15 illustrates gas curtain according to an aspect of the present invention;

Figure 16 illustrates the wrinkling paper tinsel of drawing according to an aspect of the present invention;

Figure 17 and 18 illustrates second paper tinsel according to an aspect of the present invention;

Figure 19 illustrate according to an aspect of the present invention roll the introducing paper tinsel;

Figure 20 illustrates milling roller dust arrester and milling roller wind deflector according to an aspect of the present invention;

Figure 21 illustrates scanner tunnel according to an aspect of the present invention;

Figure 22 illustrates the station that batches that comprises reel according to an aspect of the present invention;

Paper web or page or leaf at the reel place that Figure 23 illustrates are according to an aspect of the present invention opened pressurization;

Figure 24 illustrates the reel guard shield with dust arrester and nip submergence gas curtain according to an aspect of the present invention;

Figure 25 illustrates lower mandrel member gas curtain according to an aspect of the present invention;

Figure 26 to 28 illustrates floor rinse-system according to an aspect of the present invention;

Figure 29 illustrates pulper hood according to an aspect of the present invention;

Figure 30 and 31 illustrates pulper module according to an aspect of the present invention;

Figure 32 illustrates pulping gate according to an aspect of the present invention;

Figure 33 to 36 illustrates roller dust arrester according to an aspect of the present invention.

In paper web induction system according to the present invention, use air to transport dust.The paper web induction system is introduced the supply air and is extracted dust-loaded air out at the key position place.Page or leaf open stream (sheetrun) be sealing and air flow be balanced, thereby confirm the flow of turnover control volume.If be considered to favourablely, then some exhausts are by again as the supply air; And be recycled.This has reduced the capacity of leaving machine chamber, thereby has reduced the requirement of machine chamber auxiliary air.

Fig. 1 shows the instance that comprises according to the dry end of the tissue machine of the paper web induction system of an embodiment of the invention, and this paper web induction system is used for the drying section of paper web (Fig. 1 is not shown) from Yang Ji (Yankee) drying machine 1 form guided to reeling end or batch station 2.Dry end also comprises along the travel path of paper web and is positioned at Yang Ji cylinder 1 and a plurality of paper webs that batch between the station 2 are handled or the paper web monitoring equipment.In this case, paper web processing or paper web monitoring equipment comprise mangle 3, scanner 4, paper cutter 5 and page or leaf Zhang Zhanyan machine 6.Yet, should be appreciated that paper web induction system according to the present invention can be used in the dry end with other structure.

This embodiment of paper web induction system comprises a plurality of paper tinsels or plate 7,68, and these paper tinsels or plate are arranged to during batching the advancing of station 2, supporting paper web from Yang Ji cylinder 1.In addition, the paper web induction system comprises air feed module 9, exhaust module 10, dry end hood 61 (referring to Figure 13), gas curtain nozzle 12, wrinkling paper tinsel 13, gas paper tinsel nozzle 14 (optional), disconnected paper scraper 15, mangle exhaust module 16, mangle wind deflector 17, reel exhaust module 18, reel wind deflector 19, pulper module 20 and the creping doctor 21 of drawing.

With the lower part every kind of critical piece according to paper web induction system of the present invention will be described in more detail.

The paper web induction system comprises:

Machine inner part (constructing module);

Air-supported system.

The size design of various machine inner parts and the flexibility of structure allow this system is used on almost any tissue machine dry end, and irrelevant with size, speed or the structure of this dry end.

Air-supported system is customized to be fit to application.

The size design of parts is accurately to limit with selecting.Size design and selection are repeatably.For given application,, all design identical solution no matter where this system is used for.

Adopt the air feed module of nip submergence air-spray form to allow the air flow pattern at the closed nip of control place, thereby can stop the material of not expecting to get into closed nip, for example the closed nip of mangle or reel.

The top of paper web need not discharge dust as in conventional tissue machine dry end.The top that unnecessarily exposes paper web causes dust to be overflowed from the paper web top and the big casing of pressure formation around dry end.Make great efforts only solutions of poor efficiency for all of the dust that holds paper web top are conventional,, can not fundamentally deal with problems simultaneously because the enforcement of this scheme, operation and maintenance are with high costs.

Paper web induction system according to the present invention comprises a plurality of subsystems, these subsystems can collaborative works so that page or leaf Zhang Liucong creping doctor sealed effectively to reel.Utilization has realized following target according to paper web induction system of the present invention:

1. opening stream from creping doctor 21 to the page or leaf that batches station 2 physically is being closed or is utilizing the controlled flow of air type to seal.

2. page or leaf is opened stream and is designed to page or leaf Zhang Zhangli is remained in the tolerance interval of the product quality that causes improving.

3. if desired, air flow nozzles and exhaust module can adopt the automatically cleaning design.

4. greatly reduce demand to large-scale hood (dust cover) and relevant dust arrester.Most conventional control dust collecting method will become out-of-date.

5. the dust that has significantly reduced to machine chamber discharges.

6. because a page or leaf stream seals, therefore reduce control necessity greatly to air flow pattern beyond the dry end.Third generation control dirt system will become out-of-date.

7. can reduce required control dirt discharge volume atmosphere greatly and discharge flow rate.Reduce requirement thus, thereby reduce the investment and the operation cost of constructure ventilation required machine chamber air charge rate.

8. the machine frame at dry end place and peripheral equipment keep dustless relatively.

9. prevent basically that tailings, broken, dust and chip from getting in the roller.Higher efficient in product quality that this causes improving and the transfer process.

Following object is identical all the time for many years, and in these new ideas, remains unchanged basically:

Yang Ji cylinder and Yang Ji cylinder cover

Scanner

Milling roller

Reel and spool treating apparatus

Because these objects keep identical when adopting the paper web induction system, therefore hope to have the ability it is retrofitted to existing machine.

In paper web induction system according to the present invention, gas paper tinsel nozzle 14 is optional., maximum uses this gas paper tinsel nozzle when allowing page or leaf Zhang Zhangli low.

In some cases, do not need initiatively paper tinsel.Reduced the complexity of system cost like this.In following application, can save initiatively paper tinsel usually:

The length of dry end is enough short; And/or

It is enough big to accept a page or leaf tension range.

Gas paper tinsel nozzle has two purposes, that is:

Gas paper tinsel nozzle promotes page or leaf and opens, thereby reduces page or leaf Zhang Zhangli requirement;

High-speed air flow cleaning paper surface.Situation is like this all the time, but it is not counted as beneficial effect.In fact, up to now, this situation is regarded as shortcoming always, because it produces dust in dry end.

To combine Fig. 2 to 6 to describe according to an aspect of the present invention air feed module with self-cleaning mechanism or nozzle 32 now.

For need be from the application of the uninterrupted air flow of spray nozzle of the gas supply 32, cleaning plate or blade 33 be at groove, the opening of nozzle 32 or export lengthwise oscillations in 34 (referring to Fig. 2 and 3).Plate 33 makes its band tooth edge 35 pass groove 34.Sub-fraction stream is interrupted by each tooth, but this is a small loss for keeping nozzle slot to clean.Cleaning blade 33 is contained in the anallobar 36 of nozzle 32.Cleaning blade 33 activated in a lateral direction, and its actuating movement is by being arranged in steady pin 37 mechanical constraints in the straight line guiding groove 38 of cleaning in the blade 33 in straight line path, and pin 37 is as the guiders of cleaning blade 33.

Fig. 4 to 6 discloses air feed module with self-cleaning mechanism or second embodiment of nozzle 39.

In this case, nozzle 39 comprises cleaning plate or the blade 40 with linear edge 41.In addition, nozzle comprises V-arrangement guiding groove 42, and steady pin 43 is arranged in this V-arrangement guiding groove.Actuator 44 is arranged and is used to make cleaning blade 40 to move around, and makes cleaning blade 40 advance along the V-arrangement path, and make when blade 40 in air supply trough 45 during lengthwise oscillations, edge 41 immigrations and shift out air supply trough, the opening of nozzle 39 or export 45.When blade 40 when its outermost position (being disclosed position among Fig. 5), opening 45 is blocked by blade 40.Therefore, preferably only in gas curtain nozzle for example tolerable flow the nozzle that uses the disclosed type of Fig. 4 to 6 under the situation of interruption temporarily.

In paper web induction system according to the present invention, discharge between adjacent foil 7a and 7b and supply air comprise dust, shown in Fig. 7 and 8.

Air is fed in the zone between paper tinsel 7a and 7b via the air feed module 9 that has towards the horizontal spray nozzle of the gas supply 46 in downstream, and spray nozzle of the gas supply 46 is ejected into fresh air on the back edge of first upper reaches paper tinsel 7a.This air flow is even laminar flow, and its velocity field has much smaller than the maximum of the speed of paper web 47.Spray nozzle of the gas supply 46 scalable, the speed and the volume flow of the feasible air that sprays can change.In addition, have exhaust module 10 in the forward position of the second downstream paper tinsel 7b, exhaust module 10 is arranged the zone that is used between paper tinsel 7a and the 7b and extracts dust-loaded air out.Exhaust module 10 comprises the transverse row air drain 49 towards the upper reaches.

Air feed module 9 is connected to the air, ducted systems (not shown) with exhaust module 10, and air, ducted systems is arranged and is used for fresh air is guided to air feed module 9 and guides dust-loaded air away from exhaust module 10.

Extraction flow is slightly larger than gas supply flow.The low-down negative pressure of this region generating between paper tinsel 7a and 7b.From the air of spray nozzle of the gas supply 46 with combine from the terminal air blowing that discharges of the first paper tinsel 7a and from the machine chamber air of the initiation of paper tinsel top, shown in figure 11.All these air all are inhaled into air discharge duct 48.Air is not discharged through paper web 47.Through blow out air automatically realizes final balance from the paper web top.If only there is the discharge of the dust-loaded air of low discharge that the back edge of the paper tinsel 7a from the upper reaches blows out, then air discharge duct 47 must be very little, and therefore will be easy to stop up.So also be difficult to the balance air flow.

Preferably, the gap g (referring to Fig. 9) of air discharge duct 48 exceeds 1/2 " (13mm), so that obtain lower blocking probability.For example, " the air discharge duct gap g (16mm) that can use 5/8.This air discharge duct can be discharged 17.4cfm/inch (19.4 (m3/min)/m) under the web speed of 4,000 ft/min (20.3m/s).

Preferably, the supply air is mainly the EGR gas that has mixed with some fresh airs.The required flow rate of supply air is approximately 75% of exhaust flow rate.This equals about 13cfm/inch (14.5 (m3/min)/m).

With regard to conventional paper tinsel is used, preferably on the forward position of the back edge of upper reaches paper tinsel 7a upper and lower trip paper tinsel 7b, exist and reel.

This structure allows in design, structure and bigger flexibility between the starting period, because this structure allows to regulate paper tinsel geometry and air flow.

Distance between paper tinsel 7a and the 7b can vary depending on the application.Verified, the distance of about 3 to 4 inches (76 to 102mm) is suitable between paper tinsel 7a and the 7b.

In air feed module 9 and exhaust module 10, there are not hidden passage or position that can not be approaching.The operation side of exhaust module 10 has the circular inspection socket that band is thrown off breech lock fast with the driving side.This allows to check easily the inside of exhaust module 10.

Exhaust module 10 can have constant profile, no matter and the width of machine how.Existence along the hemisection of the about every 2500mm of the width of module 10 location to outlet 49.In addition, air feed module 9 can have constant profile, no matter and the width of machine how.Existence is along the rectangle entrance connector 50 of the about every 2500mm of the width of module 9 location.

Under the reconstruction situation, air feed module 9 can be retrofitted to existing paper tinsel as required with exhaust module 10.

The paper web induction system preferably at least one, more preferably great majority and most preferably whole exhaust modules 10 comprise automatically cleaning air discharge duct 48.

To combine Fig. 9 to describe the preferred implementation of exhaust module below with this automatically cleaning air discharge duct 48.The exhaust module that comprises this type automatically cleaning air discharge duct is suitable for discharging the dust-loaded air with low relatively moisture.

But exhaust module 10 comprises transfer part 51, but transfer part 51 extend antelabium 53 by tubular body 52 and tangential and form, tangential extension antelabium 53 is fixed to the envelope surface of main body 52.Main body 52 can be made up of pipeline section.But transfer part 51 is rotatably installed in the supporting structure 54, but makes that when 51 rotations of transfer part, antelabium 53 crosses the air discharge duct 48 and the cleaning air discharge duct 48 of module 10.Scraper blade 55 removes any material that possibly be attached to main body 52.When cleaning air discharge duct 48, any material that antelabium 53 will stop up groove 48 pushes in the module 10, and in module 10, loose material is deflated stream and takes away.

But transfer part 51 can be more than Rotate 180 degree between first neutral and the second place, and the second place makes in Fig. 9 and is shown in broken lines.When operation, but transfer part 51 very rapidly rotates to the second place from primary importance, returns primary importance then.But the pneumatic cylinder that preferably is arranged in the revolving actuator on the driving side of module 10 or has a special coupling assembly is used for rotation transfer part 51.

Supporting structure 54 comprises the equally spaced stay 56 along the lateral arrangement of module 10.Antelabium 53 and the laterally continuously extension of scraper blade 55 along module 10, main body 52 preferably is made up of some pipeline sections simultaneously, and each pipeline section ends at the block bearing place of being carried by stay 56.Pipeline section is connected with a cutting back pole, and pole passes each bearing and with locking the end that is affixed to pipeline section.

When crossing air discharge duct 48, the antelabium 53 interim air flows of ending, and therefore can not between the operating period of antelabium, will destroy in page application of opening stability and use self-cleaning function.To influence page or leaf at self-cleaning function and open in the application of stability, the use of antelabium will be confined to open disengaged position such as the page or leaf during the wrinkling blade exchanging.

Alternately, but transfer part 51 can be divided into independently two parts that activate.This will allow half work of groove 48, and second half one then is cleaned.Yet this will require to use two actuators rather than one, in this case, an actuator arranged on the fore side of module 10 preferably, and an actuator is arranged on driving side.

The design of disclosed exhaust module 10 allows the material of possibility cross-over connection air discharge duct 48 is pushed in the groove 48 among Fig. 9.Optional structure can allow the cross-over connection material is released groove 48, and in this case, the neutral of antelabium 53 preferably is positioned at exhaust module 10 inside.In addition, in this structure, one or more actuators must have the structure of putting upside down.

Another kind of known exhaust module is long semi-barrel shape device, and it has the vertical air discharge duct in dust-loaded this module of air suction.Usually, the air discharge duct of these modules becomes and is stopped up by the retree web materials of suitable bulk.In many cases, air discharge duct is not easy approaching, and needs to keep the simple mechanism of groove cleaning.

The common air discharge duct of this dust arrester is the half long and narrow rectangular aperture of arranging along the horizontal direction of module.Opening can be on the flow direction of exhaust convergent slightly.The lateral length of air discharge duct is usually in the scope of 10 to 30 feet (3.0 to 9.1m), and the groove interstice coverage is about 1/2 " to 2 " (1.3 to 5.1cm) usually.If the padding of retree web materials resides in the air discharge duct, then this filler is difficult to break away from sometimes.In this type dust arrester was used, the back of water possibility " erosion " padding was displaced to help it, but this is not the total energy success.As time goes on, when effective air discharge duct area reduced owing to one or more paddings, the performance of dust arrester reduced.

Up to now, only use following method to remove the padding of dust arrester suction tank:

Manually clean

Compressed air abate spray thrower

Manually cleaning is not always feasible, because dust arrester usually is arranged in inaccessible zone.The compressed air spray thrower neither be effective, because have high vacuum levels at the suction tank place, this causes being difficult to padding is displaced.If the air spray thrower has been displaced any padding really, then padding becomes in the dry end of machine and is carried by air, and this does not expect.The big padding that allows to drop out outside the dust arrester possibly cause a page tension fracture.Therefore, need a kind of wet dust arrester, its permission sucks padding in the dust arrester, thereby avoids the disturbance of dust arrester outside.

To combine Figure 10 to 12 to describe another embodiment of the dust arrester with automatically cleaning air discharge duct below.

Figure 10 to 12 schematically discloses the transverse views of this exhaust module of the form with dust arrester 57.Dust arrester 57 comprises frid 58 and following frid 59, and each in last frid 58 and the following frid 59 demonstrates the crenellation pattern with pitch P.Frid 58,59 limits air discharge duct 60.

As in the conventional dust arrester, following frid 59 adjustable grounds are fixed in the dust arrester 57.Yet last frid 58 is movably disposed within the dust arrester 57, make its can with the haul distance that is equal to or greater than P groove 60 vertically on move around.

Consideration is at the padding along the retree web materials of any position of groove 60.When last frid 58 moved around, effectively the groove gap changed.Padding stands the variation in this groove gap.When this groove gap, position increased, padding was pulled in the groove 60 by the air that is inhaled into dust arrester 57.When effective groove gap reduced, padding became and is compressed or shears.Along with the repetition of circulation, padding is pulled in the groove 60 fully.

When last frid 58 moved around, the open area of suction tank 60 kept constant and air flow roughly keeps constant.Therefore, the air flow balance of whole control dirt system remains unchanged.

According to the accumulation rate of material on groove 60, the vibration of last frid 58 can be constant or the circulation break-make.The resting position of last frid 58 is preferably in the midpoint of its stroke, and is shown in figure 11.Can use the simple pneumatic cylinder of band timer to operate upper plate 58.Can use limit switch to provide feedback to confirm to go up the resting position of frid 58.In optional embodiment, two frids can be movably disposed within the dust arrester 57, make two frids can both groove 60 vertically on move around.

To combine Figure 13 to describe dry end hood according to an aspect of the present invention now.

The dry end hood of paper web induction system is the assembly of physical barriers, gas curtain and controlled flow of air type, and this assembly is sealed the dry end of machine effectively and overflowed to prevent dust.

The border of this dry end hood is shown in Figure 13 and be described below:

The top of paper web

From the driving side edge of paper tinsel and fore side edge straight down to the floor.

Operation floor and pulper.

Gas curtain and panel in the reel location.

Through the certain characteristics of describing among this paper, page or leaf is opened stream and is closed.Dry end hood 61 is that wherein mass flow and energy must balanced control volumes.

The gas curtain that will combine Figure 14 and 15 to describe according to an aspect of the present invention now.

Shown in Figure 14 and 15, the part of dry end hood can be realized that in this case, the dry end hood comprises gas curtain nozzle 62 by gas curtain, and gas curtain nozzle 62 makes to form the straight line gas curtain straight down that extends to the floor 63 of dry end from paper tinsel 7 along paper tinsel 7 location.

In routine control dirt system, air moves inward towards machine near web edge, to attempt to comprise dust.In paper web induction system according to the present invention, air outwards moves from machine near web edge.

Gas curtain is the non-intrusion type dynamic barrier between adjacent area.Physical barriers such as wall or band heavy curtain possibly be cheaply, but its physics and vision of having suppressed the operator are approaching.

The side that air is opened stream along paper web or page or leaf is introduced into, with the edge of stablize paper web or page or leaf 47 and with dust-loaded entrained air in the dry end hood.Produce favourable air flow pattern.

Through applying the straight line gas curtain straight down that is orientated in the vertical along the edge of a page or leaf stream, realized two important results:

Dry end is sealing basically, because the space below the paper web is sealed to the floor on fore side and driving side, and

Air flow near the initiation of paper web outwards moves from machine center, thereby improves edge stability.

When looking, people can think that paper web 47 will be pushed away paper tinsel 7.Situation is really not so.Air flow pattern by nozzle 62 causes in the zone of paper web 47 is shown in figure 15.

In the infeasible zone of gas curtain, preferably use the hood panel.When gas curtain and panel are all infeasible, system will rely on the entraining velocity of 100 to 150fprn (0.5 to 0.75m/s) to carry dust-loaded air secretly.

To combine Figure 16 to describe the wrinkling paper tinsel 13 of drawing according to an aspect of the present invention now.

The wrinkling paper tinsel 13 of drawing is used for transporting the paper web from creping doctor.

Transverse sealing nozzle 64 at the upstream extremity place of drawing nozzle 13 is used for air being blown on the surface of Yang Ji cylinder 1, makes boundary layer air be removed from Yang Ji cylinder 1 before at the wrinkling blade 65 that paper web 47 arrives creping doctor 21.Sealing nozzle 64 is preferably the automatically cleaning type that preceding text combine Fig. 2 and 3 to describe.Paper tinsel 13 is the pumping chamber of nozzle air.

In most of the cases, the dry end heel portion of Yang Ji cylinder 1 (dry end toe) is with leakage air.This leakage air is damp and hot, and pollutes by dust with from the combustion product of the direct-fire heating system of Yang Ji cylinder cover.Importantly carry and remove this air secretly.Except the normal boundary layer of air that leaves owing to translational surface, the cylinder cover can pressurize.According to the design and the balance of Yang Ji cylinder cover, every kind of machine has different leak rates.This air that is loaded with moisture is delivered at the end face of paper web usually.It produces condensation at paper tinsel usually on lower surface.This causes page or leaf to open additives or " goo " gathers on the paper tinsel surface.

The FAQs that runs in this zone is a marginal instability.This problem mainly is to be flowed into by the air of machine side surface during towards the dry end pumped air at paper web 47 to cause.This problem is aggravated by the pulper gas extraction system usually.Draw paper tinsel 13 and preferably be furnished with the side gas curtain nozzle that preceding text combine Figure 14 and 15 types of describing.

Exhaust module 10 as the dust arrester with horizontal suction tank is located at wrinkling upstream extremity (referring to Fig. 1) of drawing paper tinsel 13 paper tinsel 68 afterwards.This zone is balanced.The flow rate Q1 of the air of dust arrester discharge is following stream sum thus:

Yang Ji cylinder boundary layer and leakage air

Sealed-in nozzles air S1

The surrounding air that is blown into

From the dust-loaded air of low discharge of drawing between paper tinsel 13 and the paper web 47.

Air is inhaled into below creping doctor 21 is in paper web 47 in the zone 66.This is the result that paper web 47 moves, because paper web 47 " pumps " air by its boundary layer.In high speed machines, possibly advantageously, introduce creping doctor 21 velocity air below being in paper web 47.

This first paper tinsel 13 not should be initiatively paper tinsel, because page or leaf Zhang Zhangli must be relatively low at creping doctor 21 places.

Draw paper tinsel 13 and be furnished with abate air spray thrower 67.If paper web 47 need be directed to pulper 125 (referring to Figure 27 to 29) from creping doctor 21, then compressed air is released through a series of holes in paper tinsel 13 downsides.

The boundary layer air that transverse sealing nozzle 64 stops by 1 delivery of Yang Ji cylinder.The required winding angle of this permission on this paper tinsel 13 is less than the wrinkling winding angle that uses on the paper tinsel of drawing of routine.This causes the page or leaf Zhang Zhangli in paper tinsel 13 downstream to reduce.

Forced air is used for causing from the air flow at the edge of Yang Ji cylinder and this air flow is directed in the pulper opening.Atomization sprayer be used for guaranteeing leftover pieces or Yang Ji cylinder fluffing (Yankee fuzz) by abate in pulper.

With regard to conventional design,, creping doctor need open supporting member after drawing paper tinsel with regard to paper web or page or leaf.Hereinafter, this paper tinsel will be called as paper web induction system " second paper tinsel ".Second paper tinsel 68 that will combine Figure 17 and 18 to describe according to an aspect of the present invention now.

This paper tinsel 68 is the significant variables that are used in the dry end design.The geometry of this paper tinsel 68 is conditioned to be fit to the particular requirement of machine.The forward position of this paper tinsel is furnished with exhaust module 10, and exhaust module 10 has the similar automatically cleaning air discharge duct of type that combines Fig. 7 to 9 to describe with preceding text.Discussed like preceding text, the air that gets into this air discharge duct is the mixture of drawing paper tinsel 13 above and belows from wrinkling.

When paper scraper 15 was broken in existence, the second paper tinsel assembly must be recoverable, shown in figure 18.This allows disconnected paper scraper 15 to engage and allow paper web 47 to transmit and gets into pulper 125 (referring to Figure 27 to 29).

Laterally abate air shower 69 is positioned on the strong side of disconnected paper scraper 15.Produce favourable air flow, to draw paper web 47 where necessary downwards.

When second paper tinsel 68 was regained, the fixedly curtain plate 70 that suspends from the dry end heel portion of Yang Ji cylinder cover was near the top of second paper tinsel 68.This has sealed the zone 70 of adjacent Yang Ji cylinder 1, so that when disconnected paper scraper 15 is directed to pulper 125 (referring to Figure 27 to 29) downwards, help entrained dirt at paper web 47.

To combine now Figure 19 describe according to an aspect of the present invention roll the introducing paper tinsel.

Most of machines do not use mangle.For the machine of certain use mangle, special transition region is incorporated in the paper tinsel to allow that paper web is delivered into and leave the milling roller sealing paper web from the top simultaneously.

Mangle is introduced paper tinsel 71 guiding paper webs 47 and is got in the gap between the milling roller 72 and 76 that reverses each other that is formed at mangle 3.In the mangle porch, there is coiling on the milling roller 72 down.Air feed module with gas curtain nozzle 12 forms that produce nip submergence air-spray is used to realize two main tasks.

It prevents that dust-loaded air from getting into closed nip.

" heave " to prevent down the paper web on the milling roller in the zone of its pressurization paper web top.

Can use at mangle and introduce the Page selectable Zhang Zhanyan gas paper tinsel on the paper tinsel 71.

The dust arrester 10 that has the automatically cleaning suction tank strategically is positioned at the downstream end of paper web supporting paper tinsel 71, and removes dust-loaded air from the back edge of paper tinsel 71.

To combine Figure 20 to describe according to an aspect of the present invention milling roller dust arrester 16 and milling roller wind deflector 17 now.

Wind deflector 17 uses in the green end side of following milling roller 72 with dust arrester 16.This is similar to the unit (below will describe) that the reel place uses in design.

The dust-loaded air in boundary layer is pumped to usually in the zone 73 of moving between milling roller 72 and paper web 47 downsides.

The required minimum flow rate from the air of this dust arrester 16 that is used for discharging the overvoltage in this zone 73 can be predicted through following equation.

Q1=B1+B2

Wherein:

The volume flow rate in the boundary layer of B1=paper web 47 downsides.

The volume flow rate in the boundary layer on the following milling roller 72 of B2=rotation.

Boundary layer air stream can use the CFD analysis tool to simulate.

To combine Figure 21 to describe scanner tunnel according to an aspect of the present invention now.

Dust-loaded air is entrained in above the paper web through scanner 4 time effectively.

Notion used herein is similar to like preceding text and combines the conveying to paper tinsel of Fig. 7 and 8 described paper tinsels.

Paper web 47 is introduced paper tinsel 77 in the porch of scanner 4 by scanner and is supported.Shown in figure 21, the back edge of this paper tinsel 77 is near probe 80.After this air feed module 9 with low pressure feed nozzle 46 is positioned at along the top, and it opens on the direct of travel and towards exhaust module 10 at page or leaf and discharge air, and air sucks exhaust module 10 or the dust arrester of drain tank 48 as having.The speed of air has relatively low value than the speed of paper web 47.

Scanner is drawn the downstream that paper tinsel 78 is positioned at scanner 4.Paper tinsel 78 tilts, and makes the winding angle of realizing about 2 degree to guarantee good conveying.The forward position of this paper tinsel 78 has level and smooth forward position.Air discharge duct 48 be positioned at this edge directly over.Air discharge duct 48 is self-cleaning.The volume flow rate of exhaust is a little more than the volume flow rate of air feed module 9.When this regional balance, paper web is not inhaled into.

Hood panel 79 horizontal orientations and extend to the last dry end face of scanner frame from the top of dust arrester 10.Enough gaps of the scanner that moves are provided.

When probe in the horizontal through out-of-date, the counterpart of the part of supply nozzle 46 and air discharge duct 48 is covered simultaneously.During at page or leaf Zhang Liuzhong, prevent air discharge duct self-cleaning mechanism operation (realizing) at probe by control logic.

To combine now Figure 22 describe according to an aspect of the present invention comprise reel 87 batch station 2.

Zone on the green end side of reel is such zone: this zone is because mobile entering boundary layer air is pressurizeed naturally along with the outer surface of the downside of paper web 47 and reel 87.Boundary layer air on the downside of paper web 47 has high relatively dust concentration.

Wind deflector 19 horizontal orientations and being positioned on the green end side of reel 87.This wind deflector is furnished with scraping blade 88.Scraping blade 88 blocks the boundary layer air that moves with reel 87 and help to prevent that paper web 47 from " heaving " above reel.Air is by the horizontal wind deflector 19 of bending and deflect down.

Reel exhaust module 18 with dust arrester form is used for deflating from this zone.If directly do not extract this air out from this zone, then this zone is pressurized, and this air can be extruded dust-loaded air the side of machine.This air also can cause paper web 47 when it is transported to reel 87, " to be heaved ".

Being dimensioned to of dust arrester 18 is fit to follow the flow rate of the boundary layer air that paper web 47 takes place and the rotation of reel 87.

The suction apparatus of dust arrester 18 can be that preceding text combine the described automatically cleaning type of Fig. 9.

The required minimum flow rate from the air of this dust arrester 18 that is used for discharging the overvoltage in this zone can be through following formula prediction.

Q1=B1+B2

Wherein:

The volume flow rate in the boundary layer on B1=paper web 47 downsides.

The volume flow rate in the boundary layer on the reel 87 of B2=rotation.

Boundary layer air stream can use the CFD analysis tool to simulate.

The paper web or the page or leaf that will combine Figure 23 to describe reel place are according to an aspect of the present invention now opened pressurization.

Page or leaf Zhang Zhanyan machine 6 just in time is positioned at before the reel zone.Air just in time is introduced into above the paper web 47 after page or leaf Zhang Zhanyan machine 6 with before the reel guard shield 101.This zone is covered by hood 102 and pressurizes to help paper web 47 is clung to the surface of reel 87.

In order to prevent when paper web from " heaving " paper web to be transported to reel 87 from page or leaf Zhang Zhanyan machine 6, air is released at the Hou Yanchu of extension machine 6.The geometry of hood 102 helps above paper web 47, to form pressurised zone or volume 103.At first, air has than low velocity and positive static pressure.Air is advanced along with paper web 47 and is passed in the restriction site between guard shield 101 and the reel 87.Air is released to the zone of reel 87 tops.Static gage pressure is zero at the air place of being released, and dynamic pressure is a positive number.

It is under-voltage identical with formation below paper web 47 on the top of paper web 47, to form overvoltage.Importantly, there is the pressure reduction that promotes paper web 47 downwards.Air rate through change getting into zone 103 or be adjusted in guard shield 101 and reel 87 between the gap, can easily regulate this pressure reduction.Air is introduced under low speed, thereby avoids the paper web stability problem.

Bernoulli's theorem (conservation of energy) shows that the static pressure in the low regime finally leaves this place, regional flow restriction position at air and is converted into velocity pressure.Static pressure is substantially zero in this position." static pressure " is the term of in fact representing static gage pressure.Surrounding air has zero " static pressure ", because this is benchmark or reference pressure.

To combine Figure 24 to describe reel guard shield according to an aspect of the present invention now with dust arrester and nip submergence gas curtain.

Utilize gas curtain 104, dust arrester 105 and hood panel 105 in the favourable air flow pattern of reel region generating.This specific combination will realize twining cleanly the stable paper web of entrained dirt simultaneously.Equipment does not influence the normal mechanical motion that the reel place takes place.

Reel guard shield 101 extends cross-machine and above reel 87, is orientated vertically.Exhaust module with face dust arrester 105 forms is attached to the top of reel guard shield 101.Preferably, dust arrester 105 comprises as combining the described automatically cleaning groove of Fig. 9.

To adopt nip submergence air-spray notion with the mangle employed similar mode that enters the mouth.Air feed module with form of nip submergence gas curtain nozzle 12 is positioned at reel 87 tops.This straight line free jet horizontal orientation and be directed at roller 107 places.

Nip submergence air nozzle 12 preferably is furnished with the described self-cleaning mechanism like preceding text combination Fig. 4 to 6.Steam line 109 has baffle plate (diver damper) (not shown) that is used for during paper injection, temporarily stopping nozzle air stream.

Gas curtain nozzle 12 air are submergence nip 110 on the whole width of paper web.Get into the boundary layer air of most of air of nip from nozzle 12 and Large Roller 107.When this air got into convergence nip 110, this air edge direction opposite with web direction through reel 87 time was discharged from.Leaving the keen draft of closed nip 110 possibly discharge at the graininess and the small pieces broken of the paper web top carry way above the reel 87.

The strong rotational flow field of region generating that limits at top and reel guard shield 101 on gas curtain 104, reel 87.

Air flow in this zone is balanced to realize carrying secretly of dust and chip.

Q1=is from the required minimum exhaust flow rate of reel guard shield dust arrester 105

S1=opens the supply flow of pressurization from reel top page or leaf

S2=is from the supply flow of nip submergence air nozzle 12

Boundary layer flow rate on the whole Large Roller 107 of B1=

C1=is used to carry secretly required air flow=area x entraining velocity at fore side and driving side

Q1=S1+S2+B1+C1

Boundary layer air stream can use the CFD analysis tool to simulate.

Reel dust arrester 105 has big relatively discharge volume flow rate, and it has the big suction tank gap of 3 inches (76mm).This reel dust arrester can suck a large amount of brokens.The broken trap of use in these dust arrester downstream separates large stretch of broken and this broken is delivered to pulper.

To combine Figure 25 to describe lower mandrel member gas curtain according to an aspect of the present invention now.

Lower mandrel member gas curtain nozzle 117 is used for carrying secretly otherwise the dust that can take away with the boundary layer air of roller 107.This nozzle 117 also can clean paper web immediately after paper web is rolled.This nozzle blows air facing to roller 107 immediately after roller 107 contact reels 87.Nozzle 117 is the fixed lateral nozzle, and preferably includes the described self-cleaning mechanism like preceding text combination Fig. 4 to 6.

Soft curtain 118 extends downwardly into the floor from the nozzle pumping chamber.This soft curtain is processed by forming fabric or similar material.The broken that this soft curtain allows to be pushed into usually in the pulper opening passes through.If below reel, there is not the pulper opening, then rigid panel is used to the curtain below the nozzle 117.

As selection, thinking that in case of necessity this nozzle 117 can activated.This nozzle can activated, make it when Large Roller 107 is reeled along the diameter of the Large Roller 107 that changes.All the time under the situation near the surface of roller 107, paper web is cleaned at nozzle 117.This is the best opportunity that the cleaning page or leaf is opened.

To combine Figure 26 to 28 to describe floor rinse-system according to an aspect of the present invention now.

Be disconnected paper scraper 15 or creping doctor 21 places with page or leaf open blow off in pulper 125 after, and page or leaf is opened be reconstructed on the reel between, need cleaning.

Paper web induction system according to the present invention is designed to make that can suspend or accumulate in page or leaf at seldom position broken opens the face that flows down.

Under the situation of page or leaf tensile crack, most of broken is fallen on the floor below the paper web.

Compressed air scavenging conduit (not shown) can be installed help guarantee that all brokens are all to the floor.

Floor 119 tilts towards (a plurality of) pulper opening 120.Floor area is along the side fringing (curb) of the base plate vicinity of machine.

Laterally spraying house steward 121 is positioned on the floor 119 and horizontal orientation.Water is managed 121 low speed from this and is flowed out and impact bending plate 122.Water " fan " also produces uniform current in the vertical on floor 119.This spray thrower can wash the floor of entire machine width.Rate of flow of water is enough to the broken flushing is fallen into pulper 125 (referring to Figure 27 to 29).Spray line 121 is designed so that the atomizing that it does not cause water, and atomizing possibly cause the humidity problem in the hood zone.This house steward 121 needs the low-pressure and the high flow capacity of lasting short period (possibility 30 seconds).

Broken is disposed and the whole process of dry end cleaning can automation.

Floor 119 can tilt to one or more other broken skewed slot openings 120.The floor changes along with existing machine geometry.Figure 27 illustrates the machine how floor is applied to have three openings 120.

Figure 28 illustrates the machine how floor is applied to only have a broken skewed slot opening 120.

To combine Figure 29 to describe pulper hood 127 according to an aspect of the present invention now.

Prevent (that is, in the dry end the hood 61) effusion in the enclosed area of pulper 125 below paper web of mist and damp-heat air referring to Figure 13.With the low flow rate of the best when the pulper hood deflates, realize this purpose by physical barriers and gas curtain.

This innovation aspect allows " bubble " of damp-heat air and mist is entrained in the pulper 125.With the exhaust of the exhaust that is directed to outside far fewer than conventional system.

Usually, pulper 125 has maximum three broken skewed slot openings 120.An opening is positioned at below the creping doctor 21, and optional opening 120 respectively below mangle 3 with batch below the station 2.Sometimes, comprise additional opening (not shown) on the machine next door that is used for manually disposing broken.

Pulper module 20 is positioned at the floor opening part below the creping doctor 21.

Preferably; Pulping gate 124 is disposed on all the broken skewed slot openings 120 except the opening below Yang Ji cylinder 1; At the opening part below Yang Ji cylinder 1, gas curtain 128 (referring to Figure 30) is used to prevent that mist and steam from escaping in the enclosed area below the paper web.

This system allows to control fully the mist and the steam of pulper.

The pulper module 20 that will combine Figure 30 and 31 to describe according to another aspect of the present invention now.

The operation floor place sealing pulper 125 of pulper module 20 below creping doctor 21 allows broken to pass through once in a while simultaneously.

Opening part uses horizontal gas curtain 128 on the pulper floor.Gas curtain nozzle 129 leads slightly downwards from level.At production period, gas curtain nozzle 129 is on-stream.This gas curtain nozzle is accomplished two tasks:

When only needing minimum exhaust flow rate, control unfavorable air flow (such as because leftover pieces enter the air flow that causes in the pulper).

Nozzle 129 is good destinations of supply air.The air that returns the machine from the recirculating system supply is the air that need not be discharged in the atmosphere.

Figure 30 illustrates the pulper module 20 that is used on the machine that below creping doctor, has single pulper opening.

Transverse opening 130 on pulper module 20 dry end sides allows to pass through from the broken of the floor rinse-system that combines Figure 28 to describe like preceding text.Only below creping doctor, only having just need be at this opening 130 on the pulper module 20 dry end sides in the application of a broken skewed slot floor opening.In the application that has a more than broken skewed slot opening, the floor rinse-system can be directed to other opening 120 (referring to Figure 27) with water and broken.

When paper web when machine is imported into pulper down at full speed, paper web delivery is with its boundary layer air stream.In this case, with use the baffle plate (not shown) to stop supply air temporarily to nozzle 129.

Gas curtain nozzle 129 can have the water smoke of introducing internally, to guarantee that this gas curtain nozzle keeps clean under the situation that the supply air not really cleans.For example the mechanical type automatically cleaning designs of nozzles of preceding text combination Fig. 4 to 6 shown type is another acceptable option.

Exhaust module with horizontal pulper exhaust main or dust arrester 131 forms is positioned at top, operation floor.The array of suction line that is vertically oriented or pickup tube 132 is from the top of the adjacent pulper 125 of house steward's 131 extensions and entering and floor opening 130.

Each suction line 132 has concentric tapered portion section (referring to Figure 31) at suction inlet 134 places that it is positioned at the bottom end position of pipe 132.Intet diameter is less than the diameter of the principal part section of pipe 132.Suction inlet 134 plays the effect of Venturi throat.Water is incorporated into each pickup tube 132 via hemisection to water pipe 133.

During normal operating condition, because in the higher magnitude of the speed straight up of suction inlet 134 place's air, water is prevented from from suction inlet 134 overflows (and getting into the pulper).

Under the situation that takes place to stop up at suction inlet 134 places because broken or other material are attempted to get into, water no longer is prevented from overflow and gets in the pulper 125.Water gathers above padding, up to having enough weight to remove material and making it fall into pulper 125.Padding perhaps is inhaled in the dust arrester 131 or must falls into pulper.

If fiber accumulates on the edge (edge) of suction inlet 134, then water will gather along the edge and the wetting material that it is dropped.

The inspection socket (not shown) is included among the horizontal house steward 131.These inspection sockets are concentrically positioned on house steward's the top above each pipe 132.

To combine Figure 32 to describe pulping gate according to an aspect of the present invention now.

Exist a more than pulper opening and these openings to be mainly used in the application of manual disposal broken and cleaning, preferably using gravity operated formula pulping gate 135.

Hinged door 135 is processed by lightweight stainless steel metal plate.Hinged door keeps shut under the gravity effect, but opens easily to allow wetting broken 136 to pass through.The similar check-valves of the effect of hinged door.Need preferably have the flushing shower 137 wetting brokens of hand-operated valve and guarantee that it moves through door.Hand push button and control system timer can be used to provide with control valve the flushing of a few minutes.Alternately, will enough use from the water of floor rinse-system.

Big transverse opening (such as below the reel or the opening below the mangle) in, the rotation of door is horizontal orientation preferably.

Swash plate 138 can shown in figure 32ly be added, and the existing part of the broken chute wall that perhaps tilts can play same function.

Past has been used various types of actuating doors, but fact proved that gravity is more reliable than actuator.

To combine Figure 33 to 36 to describe exhaust module according to an aspect of the present invention now with roller dust arrester form.

The paper web delivery air that moves.When paper web was reeled around roller (for example slewing rollers or extension roller), some boundary layer air were trapped between paper web and the roller.This phenomenon has reduced tractive force.

Figure 33 is illustrated in the roller 196 in the tissue machine dry end.Dust-loaded air is advanced above roller 196.Form higher-pressure region 197 at 208 places, paper web shift-in position, and form low-pressure area 198 at paper web outflow location 209.Higher-pressure region 197 promotes paper web 47 away from roller 196, and low-pressure area 198 makes paper web adhere to roller 196.

Roller dust arrester according to the present invention has been designed to the trap dust at the latter place.

The roller dust arrester improves tractive force, removes dust-loaded boundary layer air simultaneously.

Roller dust arrester 199 (referring to Figure 34) can be integrated into new roller or existing roller.Dust arrester 199 comprises pumping chamber 206, and pumping chamber 206 opens towards rotation roller 196, makes roller 196 form the part of dust arrester housing.Upstream side at the interface, roller are sealed to the roller dust arrester.At the place, downstream at the interface adjacent with paper web shift-in position, the roller dust arrester is included in the air-breathing or air discharge duct 200 that transversely extends of dust arrester 199.

Suction tank 200 has outgoing nip.The broken that can drop on the suction tank is displaced owing to moving of roller 196.If stop exhaust stream temporarily with baffle plate, then air will be owing to the pump action of rotation roller spout.

Roller dust arrester housing 201 is sealed to roller through the sealing device of scraper 202 forms.Scraper is the lightweight cleaning doctor that is made up of plastics or composite.Scraper loads on the roller lightly.As a kind of selection, sealing device can be processed by air knife.

In the inside of roller dust arrester 199, owing to the inside translational surface of roller 196 produces inner eddy airstream flow pattern.With regard to conventional dry dust collector, inner vortex is with helping keep the cleaning inside degree.

Because moving of suction tank one side (being the roller surface) can not be by the dust granule cross-over connection suction tank 200 that gathers.Therefore, little suction gap is feasible.

Known by experience, " groove (12.6mm) sucks the gap and is highly susceptible to usually owing to buildup of particulate matter is stopped up and cross-over connection in tissue-towel level control dirt is used, less than 1/2.It is also known that,, need the required minimum suction velocity of 4,000 ft/min (20.3m/s) in order to minimize the obstruction possibility.In many cases, exhaust flow rate depends on required minimum suction velocity and required minigroove gap.In these cases, required ability exceeds the required practical capacity of control dust.Utilize roller dust arrester 199 can realize " groove gap (6.3mm) little of 1/4.Therefore, the exhaust flow rate ability can be than low maximum 50% of conventional dust arrester.

Add that by the volume flow rate of the air of the boundary layer of moving paper web delivery any additional air flow in the zone that is incorporated into the roller upper reaches confirms volume flow rate through prediction.

Roller dust arrester according to the present invention can be applied to almost any entrance pressure district of paper web take up roll.It has improved tractive force and entrained dirt.

As the instance that the roller dust arrester is used, Figure 35 illustrates the tissue machine extension machine roller 203 of being furnished with roller dust arrester 199.Extension machine roller 203 is positioned at the positive downstream part of the paper cutter 204 that comprises saw blade 205, and saw blade 205 is adjustable in the horizontal.Therefore, in this case, roller dust arrester 199 forms the paper cutter dust arrester.

At the upper reaches of extension machine 203 and roller dust arrester 199, the air feed module 9 of said type is used for additional air is incorporated into this zone before this.

Dust from the saw blade paper cutter is carried secretly, and the raising of paper web tractive force, thereby improves the extension ability of roller.

In some tissue machines, do not use the paper tinsel plate, and paper web is supported by slewing rollers and extension roller almost completely in the dry end of machine.Figure 36 illustrates the instance of the dry end of this machine.

Dry end comprises four rollers 206, and each roller is furnished with roller dust arrester 199.Air flow to roller dust arrester suction inlet can mainly be a boundary layer air, perhaps can be replenished by the low speed air feed module as the clamping curtain.Can add the outside and blow out nozzle to keep the cleannes of roller dust arrester scraper.

There are many slewing rollers that in unreeling machine/re-reeler and classification re-reeler, use and extension roller.Should be appreciated that roller dust arrester according to the present invention can be applied to the many rollers in this equipment.

Claims (27)

1. system that is used for fibrous web (47) being transported to from the drying section (1) of said machine its reeling end (2) by the dry end of fibrous web handling machine; Said system is characterised in that; Said system comprises one or more groups air module; Wherein every group of air module is arranged to be used for the said paper web that longshore current goes out said dry end and deflates to predetermined regional area supply air and from said predetermined regional area, and wherein every group of air module comprises:

-at least one air feed module (9,12,32,39), said at least one air feed module arrangement becomes to supply air to said regional area; With

-at least one exhaust module (10,57), said at least one exhaust module arrangement becomes to deflate from said regional area,

Wherein said at least one air feed module (9; 12; 32,39) air rate is by the air rate balance of said at least one exhaust module (10,57); Thereby prevent that dust-loaded air from not being through said at least one exhaust module (10,57) but by the alternate manner said regional area of overflowing.

2. system according to claim 1 is characterized in that, the said air rate of said at least one exhaust module (10) equals the said air rate of said at least one air feed module (9) at least.

3. system according to claim 1 and 2; It is characterized in that; This system comprises the upper reaches paper webs supporting paper tinsel (7a) and downstream paper web supporting paper tinsel (7b) of arranged in succession, thus these paper tinsels (7a, 7b) between qualification freely suck the gap; Wherein said at least one air feed module (9) is positioned at the downstream of said upper reaches paper tinsels (7a), and wherein said at least one exhaust module (10) is positioned at the upstream extremity of said downstream paper tinsels (7a).

4. system according to claim 1 and 2; It is characterized in that; This system comprises mangle (3) and mangle introducing paper tinsel (71); Said mangle comprises two milling rollers of counter-rotating each other; Said mangle is introduced paper tinsel and is used for said paper web (47) is introduced the nip that is formed by said milling roller, and wherein said at least one air feed module (12) is positioned at the rotation envelope surface place of a milling roller in the said milling roller, and wherein said at least one exhaust module (10) is positioned at the downstream of said paper web supporting paper tinsel (71).

5. system according to claim 1 and 2; It is characterized in that; This system comprises wrinklingly draws paper tinsel (13) and at said paper tinsel (13) second paper tinsel (68) afterwards of drawing; The wherein said wrinkling paper tinsel (13) of drawing is arranged to carry said paper web (47) from creping doctor (21), and said creping doctor (21) is arranged to be used for remove said paper web (47) from Yang Ji cylinder (1); And said at least one air feed module comprises sealed-in nozzles (64); Said sealed-in nozzles is arranged in said upstream extremity of drawing paper tinsel (13), removes the border air layer from said Yang Ji cylinder (1) before with the wrinkling blade (65) that is used for arriving at said paper web (47) said creping doctor (21); And said at least one exhaust module (10) is positioned at the upstream extremity of said second paper tinsel (68).

6. system according to claim 1 and 2; It is characterized in that; This system comprises scanner (4), be used for the scanner that the scanner that said paper web (47) is introduced said scanner (4) is introduced paper tinsel (77) and is used for said paper web (47) is drawn said scanner (4) is drawn paper tinsel (78); Wherein said at least one air feed module (9) is positioned at the downstream that said scanner is introduced paper tinsel (77), and wherein said at least one exhaust module (10) is positioned at the upstream extremity that said scanner is drawn paper tinsel (78).

7. system according to claim 1 and 2; It is characterized in that; Said reeling end (2) comprises reel (87); Said reel (87) is arranged to and fibrous web roller (107) forms nip (110), and wherein said at least one air feed module (12) and said at least one exhaust module (105) are positioned at said reel (87) top, and wherein said at least one air feed module (12) is arranged to generation and is imported into the gas curtain (104) in the said nip (110).

8. according to each described system in the claim 1 to 7, it is characterized in that said at least one exhaust module (10,57) comprises automatically cleaning air discharge duct (48).

9. system according to claim 8; It is characterized in that; Said at least one exhaust module (10) comprise have extension antelabium (53) but transfer part (51), said antelabium (53) crosses and clears up said air discharge duct (48) but said transfer part (51) are arranged to be rotated.

10. system according to claim 8; It is characterized in that; Said at least one exhaust module (57) comprises two frids (58,59), between these two frids, forms air discharge duct (60); Each frid (58; 59) present the have pitch crenellation pattern of (P), wherein at least one (58) in these frids movably are arranged in the said exhaust module (57), make that this frid can be with haul distance vertically the moving around along said groove (60) that is equal to or greater than said pitch (P).

11., it is characterized in that said at least one air feed module (32,39) comprises automatically cleaning air supply trough (34,45) according to each described system in the claim 1 to 10.

12. system according to claim 11; It is characterized in that; Said at least one air feed module (32) comprises the cleaning blade (33) with band tooth edge (35); Said blade (33) makes that being arranged in the said air supply trough (34) along the mode that vertically moves of said groove (60) said blade can lengthwise oscillations in said air supply trough (34).

13. system according to claim 11; It is characterized in that; Said at least one air feed module (39) comprises the have linear edge cleaning blade (40) of (41); Said blade (40) movably is arranged in the said air supply trough (45) and follows the V-arrangement path, makes that said blade can lengthwise oscillations in said air supply trough (34), and makes that said cleaning blade (40) moves into and shift out said groove (45) during said lengthwise oscillations.

14., it is characterized in that this system comprises according to each described system in the claim 1 to 13:

-at least one rotates roller (196,203,206), said paper web (47) above said at least one rotation roller between paper web shift-in position (208) and paper web outflow location (209) quilt twined; With

-exhaust module (199); Said exhaust module (199) has pumping chamber (207); Said pumping chamber is the said rotation roller (196 of court between upstream seal device (202) and downstream row air drain (200); 203,206) open wide, said air discharge duct (200) is positioned near the said paper web shift-in position (208).

15. according to each described system in the claim 1 to 14; It is characterized in that; This system comprises dry end hood (61), and said dry end hood (61) has to be sealed said dry end and formation and prevent the overflow any combination of gas curtain and controlled flow of air type of said hood (61) of dust-loaded air.

16. system according to claim 15; It is characterized in that; This system comprises having at least one broken skewed slot opening (120; 130) pulper (125), wherein said at least one broken skewed slot opening (120,130) comprise and are arranged to prevent that mist and damp-heat air from escaping into pulping gate (124) and any combination of gas curtain (128) the said dry end hood (61) from said pulper (125).

17. system according to claim 16; It is characterized in that; This system comprises exhaust module (131), and said exhaust module (131) is positioned at said at least one broken skewed slot opening (130) and sentences the air that is used to extract out in the said pulper (125).

18. system according to claim 17; It is characterized in that; The said exhaust module (131) that is used to extract out the air in the said pulper (125) comprises the suction line that is vertically oriented or the array of pickup tube (132); Said suction line or pickup tube stretch into the top of said pulper (125) near said at least one broken skewed slot opening (130); Wherein each suction line (132) comprises the tapered portion section of the bottom end position that is positioned at said pipe (132), and the diameter of said tapered portion section is less than the diameter of the major sections of said pipe (132), so that said tapered portion section is as Venturi throat.

19. system according to claim 18 is characterized in that, water via with said suction line (132) be hemisection to water pipe (133) introduce in each suction line (132).

20. dry end that is used for fibrous web (47) is transported to from the drying section (1) of fibrous web handling machine the said fibrous web handling machine of its reeling end (2); Said dry end is characterised in that this dry end comprises according to each described system in the claim 1 to 19.

21. one kind is used in according to the exhaust module (10,57) in each described one group of air module in the claim 1 to 19, said exhaust module is characterised in that this exhaust module comprises automatically cleaning air discharge duct (48).

22. exhaust module according to claim 21 (10); It is characterized in that; This exhaust module comprise have extension antelabium (53) but transfer part (51), said antelabium (53) crosses and clears up said air discharge duct (48) but said transfer part (51) are arranged to be rotated.

23. exhaust module according to claim 21 (57); It is characterized in that; This exhaust module comprises two frids (58,59), between these two frids, forms air discharge duct (60); Each frid (58; 59) present the have pitch crenellation pattern of (P), wherein at least one (58) in these frids movably are arranged in the said exhaust module (57), make that this frid can be with said vertically the moving around along said groove (60) of the haul distance that is equal to or greater than said pitch (P).

24. one kind is used in according to the air feed module (32,39) in each described one group of air module in the claim 1 to 19, said air feed module is characterised in that this air feed module comprises automatically cleaning air supply trough (34,45).

25. air feed module according to claim 24 (32); It is characterized in that; This air feed module comprises the cleaning blade (33) with band tooth edge (35); Said blade (33) makes that being arranged in the said air supply trough (34) along the said mode that vertically moves of said groove (60) said blade (33) can lengthwise oscillations in said air supply trough (34).

26. air feed module according to claim 24 (39); It is characterized in that; This air feed module comprises the have linear edge cleaning blade (40) of (41); Said blade (40) movably is arranged in the said air supply trough (45) and follows the V-arrangement path, makes that said blade (40) can lengthwise oscillations in said air supply trough (34), and makes that said cleaning blade (40) moves into and shift out said groove (45) during said lengthwise oscillations.

27. a method that prevents that dust-loaded air from overflowing from the regional area in the dry end of fibrous web handling machine the method is characterized in that said method comprises the following steps:

-at least one air feed module (9) is placed in the said regional area;

-at least one exhaust module (10) is placed in the said regional area; And

The air rate of said at least one the air feed module (9) of-balance and the air rate of said at least one exhaust module (10) make the said air rate of said at least one exhaust module (10) equal the said air rate of said at least one air feed module (9) at least.

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