CN85108792A - Electromagnetic extended nip press - Google Patents

Abstract

The extended nip press that papermaking equipment is used etc. are close to its nip and dispose electromagnet to set up or to increase the pressure or the load of this nip.This type of electromagnet has broad area, forms a magnetic field of concentrating between the western conformal opposite side of whole nip, has eliminated the clearance issues that was in the past run in the magnetic squeezer.With non magnetic belt wet web was carried the nip of water-removing press, and made directly applying one felt wrapped roll of this paper web, paper web was carried overpressure zone with the calender of dried paper web.

Description

Electromagnetic extended nip press

The present invention relates to a kind of extended nip press technology that is used for papermaking equipment etc., the electromagnet that adopts has large-area face unshakable in one's determination, the area of wide nip is suitable therewith in a side of this nip at least for its big or small degree, this nip is being kept the centered magnetic field of the conformal paramagnetism pressure rolling part that passes through a face-off, in order to the paper web of failing this nip is set up or strengthened its nip load effectively.Present invention is specifically related to such extended nip press, it has electromagnet in the one or both sides of nip, and its iron core defines the pole shoe of wide area, attracting the conformal magnetic pressure rolling part of face-off that magnetic line of force slit is therebetween minimized, in order to improve gravitation to foundations such as the paper web of failing this nip or increase its nip and load.

The wide nip press technology that paper machine is used has been known, for example have Bu Sikeer (Busker) etc. to announce at United States Patent (USP) 3738225(1973,7,24), and Justus (Justus) is announced at United States Patent (USP) 3783097(1974,1,1) disclosed in content.In these two patents, paper web was carried shoe that is loaded by waterpower or the wide nip that plate-like piece formed with impermeable belt.Also know the roller squeezer that charged magnet body is arranged, its roller is attracting that roller of face-off to produce the nip load, and for example Mike Lun Lasa (Mcclenthan) announces at United States Patent (USP) 3456582(1969,7,22) disclosed in.Only do not have a line pressure district in this type of magnetic press, the wide seam between roller then is by the roller thickness that covers this electromagnet at magnet body and face-off, and the wind gathering of this linear slit nip import and export and diffusing wind space determine.The wide slit of this class has reduced the validity of this electromagnet in forming the nip load widely.

For this reason, employing has the electromagnet of large-area huge iron core, make its next-door neighbour-face-off the magnet body so that therebetween the slit minimize, in order to keep one to form the broad high-intensity magnetic field that required nip is loaded, this method that forms nip pressure or nip load in the press of wide nip should become an improvement of this technology.

According to the present invention, constituted the wide nip that the dehydration of the paper one fibrid width of cloth or press polish are used so as to following mode: in a side of web of fiber by the wide cover tile spare of magnetic attraction one, opposite side at this web of fiber then has a wide conformal paramagnetic spare, desirable roller of the latter or pressure watt form.The size of magnetic core is suitable with the area of wide nip, is forming or supporting nearly this kind pressure watt, develops into the centered magnetic field by whole nip area.This magnetic line of force is only passed through a shortest path and is arrived the pressure rolling part of face-off.Paper web transmits overpressure zone by an impermeable belt, and can be in the dehydration pressure setting on its one or both sides are topped absorbent felt, or directly fit with the hard planishing roll in the calendering device.At the nip molded component of paper web one side, can be under the influence of the formed magnetic line of force of electromagnet of excitation and be shifted.Like this, in equipment with electromagnet cover tile and roller, watt or roller in have one to be movably, and all have in the equipment of electromagnet in the both sides of paper web, then this two electromagnet whole or one are transportable.

A feature of the present invention is, make the magnetic line of force the slit that must pass through minimize and establish this nip load.For this reason, form pressure watt, make this magnetic flux arriving before the paramagnetic nip forms part on the paper web opposite flank with electromagnet, unnecessary by around the roller.This pressure watt and the formation part that is stood facing each other have the large tracts of land of equal width, improve and are concentrating magnetic strength, more effectively with the nip both sides drawing of this wide area together.

Another feature of the present invention is, is provided with special electromagnetic core along the length of nip, with compensation because any scrambling that the flexure of relevant parts and uneven expansion etc. cause nip to be loaded.

The present invention also has a feature to be, for above-mentioned electromagnetic core is provided with special coil, is fit to carry out independent excitation so that control load along the length of nip.

For this reason, one of the present invention purpose is to provide for paper machine etc. the squeezer of wide nip, and nip load is wherein set up by large-area electromagnet cover tile or strengthened.

Second purpose of the present invention is to papermaking equipment provides water-removing press and calender, makes it to have the biography magnetic and attracts the wide magnetic nip that prolongs of setting up the nip load.

The present invention's the 3rd purpose is to provide a kind of pressure roller assembly, and it has the cover tile of an electromagnetism electric excitation, constituted a wide nip with the magnetic roller of a common operation, and makes the slit that has minimum between this electromagnet and the magnetic roller.

The present invention's the 4th purpose is to provide for papermaking equipment the squeezer of a wide nip, and large tracts of land nip wherein is to be formed by opposed electromagnet, and the latter has improved the magnetic coupling force of opposed rigidity pressure rolling part

The present invention's the 5th purpose is to provide the squeezer of the wide nip of an electromagnet, and pressure load wherein is made of the magnetic line of force of concentrating between the similar large tracts of land rigidity pressure rolling part of opposed shape.

Other purposes of the present invention and other features, for the people that know this technology in fact, the detailed description of attached chart that will be by the following several optimum examples that shows the present invention with way of example, and understood.

Fig. 1 is the schematic side elevation of a kind of extended nip press of the present invention, in a side of nip one electromagnet is movably arranged, and the ferromagnet roller of a fixed axis is arranged at its opposite side;

Fig. 2 is the schematic side elevation of a kind of extended nip press of the present invention, in a side of nip one fixing electromagnet is arranged, and the electromagnetism iron roll of a removable axis is arranged at its opposite side;

Fig. 3 is the schematic side elevation with wide nip double felted press machine of a ventilation nip of the present invention;

Fig. 4 is the schematic side elevation of a kind of extended nip press of the present invention, in the both sides of nip electromagnet is arranged;

Fig. 5 is the schematic side elevation of a kind of wide-voltage calendering type squeezer of the present invention;

Fig. 6 is a kind of isometric map of movable-type electromagnet watt assembly that is used for the present invention's squeezer;

Fig. 7 is the isometric map of electromagnetic core of another kind of form that is used for the present invention's squeezer;

Fig. 8 is the schematic longtitudinal view of electromagnet watt that is used for the present invention's squeezer, and this watt shape spare has a collection of respectively by the iron core of coil stimulating, and the head unshakable in one's determination that expansion arranged is to adapt to the coiling of each coil;

Fig. 9 is the end-view along the IZ-IZ line of Fig. 8;

Figure 10 is the cross-sectional view along the X-Z line of Fig. 3;

Figure 11 is the cross-sectional view along the XI-XI line of Fig. 3;

Figure 12 is the schematic side elevation of the wide nip press of multisection type of the present invention;

Figure 13 is in press of the present invention, is used to make the schematic longitudinal sectional view of the minimized a kind of layered structure roller of intensification;

Figure 14 is a curve map, shows the functional relation of understanding nip loading and electromagnet excitation, and is illustrating that magnetic coupling force strengthens along with reducing of slit between the magnetic part of electromagnetic core and face-off.

Extended nip press assembly 10 among Fig. 1 has an electromagnet 11 on the bottom side of wide nip N, and a ferromagnetism top roller 12 is arranged on the opposite side of this nip.Impermeable belt 13 is lined up an open loop round one group of roller 14, this group one of in roller as can be driven shown in the M, and another as shown in the B can be to a square neck tiltedly with fastening this belt.These belts of outer roller 15 guiding are along its path operation, and pass through nip thereon when going.Porous matter woollen blanket 16 is walked around one group of roller 17, through above-mentioned nip, and in its bottom surface of withstanding paper web W during by this nip.Ferromagnetism roller 12 is around a fixing horizontal axle 18 rotations.Electromagnet 11 is installed on slidably that a top is opened wide, in the fixed cover 19 of class grooved, the then topped non magnetic thin cover tile 20 of the end face of this electromagnet with arch, the latter is preferably made by corrosion resistant plate.This non magnetic watt 20 slidably rest impermeable belt 13, and in the porch of nip N lubricating fluid is ejected into watts 20 and be with between 13 by a playpipe 21.

As shown in Figure 6, electromagnet 11 is to be made of with side by side relation heart sheet 22 a collection of iron or magnet steel.Heart sheet 22 is rectangular, flat 23, a flat parallel sides 24 and is arranged along the horizontal protruding top 25 of epirelief.Heart sheet 22 has smooth face 26, as shown in the figure, is fit to do with relation side by side the coupling of the property slided.

Each heart sheet 22 also has horizontal the prolonging of a pair of side by side, spaced open trough 27 to care between two opposite faces 26 of sheet.The terminal of these grooves is on the bottom 23 of each heart sheet.As shown in FIG., there is a solenoid 28 to walk around groove 27, is terminated under the top 25 of each heart sheet, cross the heart sheet epitaxy of tail end.

These heart sheets have geosynclinal convex top 25 topped with thin non magnetic watt 20, the latter is curved to be affixed on the top of heart sheet, and have the lip that curves 29 to extend the side 24 that surmounted this heart sheet downwards, make impermeable belt 13 can be guided into nip N smoothly or from wherein drawing.

The class flute profile cover 19 that the top is opened wide be fixed on and the whole length of the pressing part 10 that the ring of extend through belt 13 is interior on.Electromagnet 11 vertically slides in this cover, and the sidewall 24 of core segment then is the sidewall of cover guiding thus slidably, and by the hood-shaped therewith one-tenth sealing of seal 30.

Between at the bottom of the end 23 of heart sheet 22 and this cover, be provided with a closed chamber, and this closed chamber can be contained in the current under the pressure of pressure source 32, force electromagnet 11 and cover 20 from cover 19 rise, to establish the initial load of nip N.Also can adopt the device of some other elevate a turnable ladder electromagnet 11,, make lid 20 withstand impermeable belt and be that nip is established initial load as screw rod or spring etc.

Coil 28 is by generator G or similarly power source energising, amplitude through resistive element R control electric current, make electromagnet be subjected to grateful sending out and form the magnetic flux that control arranged, drawing this slidably electromagnet and cover tile 20 thereof and, set up desired nip load thus towards magnetic roller 12.Since cover plate 20 be bearing on the heart sheet 22 and since these heart sheets relatively say so slidably, so can make scrambling balanced low disappear of profile because of causing of nip, and these heart sheets will keep load uniformly on the whole length of nip along curved, thermal expansion etc.

In the extended nip press 10a of Fig. 2, the part suitable with part described in the squeezer 10 number indicated with identical reference number.But in squeezer 10a, the ferromagnetism top roll is not mounted on the fixed axis 18 of Fig. 1 embodiment, but be erected on the axis 18a that the bearing that held in 0 year by Rocker arm 4 supports, this Rocker arm 40 is pivotable around center 41 and is driven by a hydraulic cylinder or cylinder 42.This top roll 12 is at this moment promptly with respect to nip N lifting.

Electromagnet 11a can move in 19 the sort of supports, but is fixedly mounted on the support 19a.

As shown in Figure 7, electromagnet 11a has single heart sheet 43, and the latter has an open channel 44 placed in the middle admitting the lead-in wire of electromagnet coil 45.Like this, coil 45 is only sealed a side of heart sheet 43 and is had a lead-in wire to be in the groove 44, and another lead-in wire then is wound into the lateral surface of this heart sheet.The upper end of this coil is in having under the geosynclinal convex top 46 of this heart sheet, and cover tile 20 then holder is contained on the top 46 of groove.

The initial load of nip N applies as follows among the squeezer 10a, i.e. starting cylinder 42 end of Rocker arm 40 of going to be pulled, and the bearing that forces a 18a drops to nip and is related with cover tile 20.At this moment needed nip pressure is set up by excitation coil 45, promptly forms such magnetic flux attracts and ferromagnetism roller 12 and set up nip load to center 43.By nip, belt then slips on cover tile 20 paper web 13 on impermeability belt 13, and woollen blanket 16 is promptly as the topped firmly bottom surface of paper web of mode identical among the squeezer embodiment 10 simultaneously.

From the description of squeezer embodiment 10 and 10a as can be known, the nip load can set up by following method at the first bruss, promptly force this electromagnetic core to the cover tile 20 on nip one side, or the short cover tile of roller 12 on the opposite side of nip that make, encourage this electromagnet to establish the magnetic field of a high concentration then, by whole nip, this magnet and roller be drawn together and set up the nip load of needed enhancing.

In the squeezer 10b of Fig. 3, with embodiment 10 with the suitable part of the part of being set forth among the 10a, number indicate with identical reference number.But in embodiment 10b, dispose a pair of felt squeezer, make paper web pass through the down nip N between the felt 16 and last felt 50, the wrap bottom of roller 12 of the latter, enter and walk in the outgoing nip at paper web W, remove to meet and leave this paper web by corrector roll 51 guidings.

Discharge the water of extruding from paper web W for the ease of nip N leniently, have as the groove shown in 52 at the periphery of roller 12 as shown in figure 10, be formed for banishing the gutter of the water of outgoing nip N.

Impermeable belt 13 can longitudinally be slotted at 53 places as shown in figure 11, constitutes the gutter of nip.

Should be understood that, be that roller 12 or belt 13 all can be offered groove.

It will also be appreciated that squeezer 10b can adopt removable roller 12 and the stationary magnet 11a of squeezer 10a, replace the fixed roll 12 of squeezer and magnet 11 movably.

The included parts of extended nip press among Fig. 4 set forth before being same as the time, then the same reference number of usefulness number indicates same parts.In squeezer 10c, roller 12 replaces movably electromagnet 11 and recessed bearing, cover 19.This electromagnet 11 slides in cover 19, plays the effect of the top end face that forms wide nip N by bonnet tile 20.Impermeability belt 60 up is round corrector roll 61, at a drive roll in the open loop of cover 19 extended nip under the top cover tile 20 of one bottom arranged then.

Below fixed electromagnet 11a be that annular impermeability belt 13 by the bottom that strides across bottom cover tile 20 is surrounded.Paper web W carries by belt 13 and 60 s' nip.In the import department of nip, can between belt and cover tile 20, add lubricant.

The electromagnet 11 of top can be relied on power for support and glide to establish an initial load in cover 19.In addition, also can be described as embodiment among Fig. 1, the stream that supplies water, spring or mechanical spiral make electromagnet 11 expel its cover 19, and improve this initial load.

The fixed electromagnet 11a of bottom can get the form of the end coil 45 of single heart body, and has outside lead-in wire as shown in Figure 7, maybe can adopt structure shown in Figure 6.

The belt 13 of bottom is easily driven with a stacked nip loading roller 64 by a driven voller 63, and this belt is by roller 63 and 64 s' roll gap.

Between last belt and paper web W, also dispose cellulosic absorbent felt 65.

When the coil of electromagnet 11 and 11a is energized, the center of these electromagnets promptly by drawing to together, before those cover tiles 20 on the paper web opposite side are pushed away mutually, make the nip loading and set up required pressure.Because there is electromagnet the both sides of nip, gravitation will be considerably greater than and may be to double the gravitation that from embodiment 10,10a and 10b, is obtained, in these several examples of back, electromagnet is a side that only is arranged on nip.

The squeezer 10a of Fig. 5 has illustrated a kind of calender embodiment that is used for the incrustation of dried paper web D, W, this dried paper web is by a felt wrapped roll 70 and movably between the electromagnet 11, and this felt wrapped roll can be around a fixed axis 71 rotations and this electromagnetism iron rule is to accommodate among the cover of narrating in the front 19.Electromagnet 11 by aforesaid non magnetic watt 20 topped, this cover tile then is affixed to the impermeability belt 13 of dried paper web D, W being carried overpressure zone D again.Controlledly encourage electromagnet 11 and be to handle the nip load that this dried paper web is set up desired calender.

Shown in Fig. 8 and 9, what address previously is that the loading that the cover tile 20 of an extended nip press or a calender imposes electro permanent magnetic is to adopt such method to finish, promptly adopt a kind of calutron 80 that has improved, the latter is made up of a collection of electromagnetic core sheet, and each heart sheet has the excitation variable winding 82 of himself.As shown in FIG., this class magnet or magnet steel heart sheet have unlimited parallel slot 83 at the top and receive coil to hold, and make the end of coil outstanding from the open end of these troughs.In order between adjacent heart sheet 81, to leave winding space, on heart sheet, be provided with the head 83 that surmounts its front and rear surfaces.This just provides the slit or need not to open broad slit or interval at interval under cover tile 20 for coil 82.

As schematically illustrating of being done among Fig. 8, the end of each coil 82 can be encouraged respectively by a power source 86, changes the input of each coil as required by control piece 86a.Like this, along nip length to and separated this group heart sheet 81 just can selectively apply load to the increase of cover tile 20, with compensation along on the nip length direction because of caused nip pressure variation such as the flexure of roller, uneven expansion.

Should be noted that any gap between nip and magnetic core has been a minimization all, this is because this type of magnetic core just works by very thin non magnetic cover tile 20, just forms and the ferromagnetism roller of face-off or the magnetic line of force that heart body is set up gravitation.In addition, these magnetic lines of force have only very short path between the nip opposite side, and concentrate on the whole nip area, and formed air gap in each row squeezing part of obstructed overpressure zone turnover both sides.In extended nip press of the present invention, the width of the area of this wide nip is the width control by cover tile, and whole this piece area all has magnetic field directly to pass through and the unlikely air gap that passes through, certainly, because nonmagnetic substance has passed through nip, is to be formed with very narrow such gap.

The press 10e of Figure 12 has disposed the gap that a series of phase continued access is subjected to paper web.All indicate identical reference number number with the similar person of parts of squeezer 10,10a, 10b and 10c among Fig. 1 to 4.As shown in the figure, squeezer 10e has three nip N, each nip by a roller 12 and one movably electromagnet 11 define, the latter is in a flute profile cover 19, the topped heart sheets 22 of living of a thin non magnetic cover tile 20 are arranged, and have a compression chamber 31 to push away to make this electromagnet and cover tile set up initial nip load towards the roller that stands facing each other.Each roller 12 have one independently press felt 90 by wrapping up in thereon again by the nip N that cover tile 20 provided of this roller and face-off.Each press felt 90 as bright shown on the 3rd roller 12, around roller 91, can be driven shown in M one of in the roller 91.It is this around tightening that outside idler roller 92 keeps felts, and inner corrector roll 93 then keeps this felt to be on the path around roller 12, and by nip N with walk around roller 91.The top of single impermeability endless-belt 94 travels through all these three nip N, around the driven voller 95 outside a nip N in the end, walks around the nip N of back to the front of roller 96, pastes then on the corrector roll 97 more and as the bottom of this belt.

Electromagnet 11 can give excitation to improve its nip load in continuous mutually nip N.

The roller 12 of squeezer 10e can be replaced by electromagnet 11 as the squeezer 10c among Fig. 4.

Can replace felt among squeezer 10,10a, 10b, 10c and the 10e with a kind of micro porous metal belt (end shows bright), with the non-magnetic gap between two opposed roll that reduce nip.In addition, the cover tile 20 that can also remove squeezer and felt wrapped roll device to be reducing the gap, but because these cover tiles are very thin, can be used in to keep lubricating fluid to avoid magnetic coil and make the nip surface smoothingization, thereby they is the adapters that meet the requirements.

As shown in figure 13, can dispose a kind of pressure roller, so that the phenomenon of eddy current heating nip reduces to minimum for squeezer of the present invention.This roller 12a has a columniform steel core body 98, and its two terminations 99 have rotatably mounted this roller of a 99a itself.The thin laminate patch 100 of a buttress in after-combustion on this heart body, is pressed together by termination 99.The laminate patch 100 of these stackings is the washer plates that approach, and is thick about 0.04 to 0.20 inch, wide about 2 to 3 inches.They are close to heart body 98, and are made by the metal that does not produce eddy current in the formed magnetic field of above-mentioned electromagnet.This kind eddy current is produced by common paramagnetic material, and roller is heated during by magnetic field at it.When not needing this heating phenomena, just adopt the roller of the layered structure of this 12a one class.

The material that is applicable to above-mentioned laminate patch part is the lip-deep oxide coating that is formed by the silicon steel of orientation at this thin packing ring 100, amorphous or unbodied ferrite etc.

Figure 14 explanation, polarity might be strengthened in the gap that reduces must pass through in magnetic field.Like this, as indicated in curve Figure 101, the inductor excitation is with the peace times number of turn (from 0 to 14000) expression, as slogan banner 102; Static gravitation marks 103 with the long expression of pound/inch as vertical, and along with the gap is reduced to 1/8 inch from 3/4 inch, gravitation increases greatly.0.125 inch curve to 14000 peace of extrapolating times number of turn shows that used electromagnet can produce 500 pounds of/inch long power in the wide nip assembly of the present invention, the twice of this value that the squeezer 10c that is equivalent to Fig. 4 approximately can reach with two blocks of magnet that attract each other.

The stacking height of non magnetic cover tile, belt, woollen blanket and paper web among the nip N of squeezer of the present invention is only in magnetic core and ferromagnetic roller or the slit that stands facing each other and cause 0.05 to 0.36 inch between the magnetic core.Illustrated as the front, and belt can be taken across lubricated electromagnetic core lead-in wire and go up and release cover tile 20.But, this kind cover tile helps to keep lubricating fluid not contact coil.In this class component, cover tile can have and is no more than about 0.125 inch thickness, and each belt then can have 0.20 to 0.10 inch thickness, and nature, the thickness of paper web can omit to be disregarded, and only is about about 0.002 to 0.010 inch.Impermeable belt preferably is made of the plastics of rubber or polyurethane and so on, but can further reduce non-magnetic gap with impermeable metal strip.As previously mentioned, woollen blanket can be replaced around bent metal tape with thin microporosity, the water that squeezes can be flowed into and flow out therebetween, and can also further reduce this gap.

Cover tile 20 can adopt hard rubber, plastics, stainless steel or other any nonmagnetic substance etc.The width of cover tile on the fuselage direction can change according to condition, but wants wide the large-area magnetic field that is enough to form.Reasonably minimum widith is about 4 inches, and Breadth Maximum is about 18 inches.Cover tile can be from the very narrow overall with that changes to machine at the transverse width of fuselage.The overall with of cover tile is answered the cross directional variations of random device, to adapt to the scrambling of belt, woollen blanket, paper web and roller and magnetic core coupling face.If necessary, wide spacing to 6 inches can be arranged between these cover tiles.

As mentioned above, along with metallic roll rolls across magnetic field, can produce the heat that helps wet-pressing.If do not need heat, roller should be taked the sort of laminated chip architecture among Figure 13 recited above so.

According to as can be known described above, the extended nip press that is used for handling wet or dried web of fiber that the invention provides, the nip load is set up by electromagnet or is strengthened, the heart body of this class electromagnetism electricity institute tool has played just sets up the magnetic line of force that passes through whole wide nip area by minimum gap, they attract the face-off both sides of nip opposite to each other, and establish needed nip load on the whole width of the wide nip that prolongs and length.

Revisal: 85108792

After the preceding revisal of the capable revisal of file name page or leaf

Specification 44 ... IZ-IZ ... IX-IX

4 5 ……X-Z…… ……X-X……

5 15 ... one closed chamber is arranged ... one closed chamber (31) is arranged

5 21 ... amplitude ... amplitude

83 ... stream supplies water ... use hydraulic fluid

89 ... blanket ... felt

9 25 ... individual

11 11 ... blanket ... felt

11 19 ... blanket ... felt

12 1 ... blanket ... felt

Claims (20)

1, a kind of extended nip press of using of papermaking equipment, its feature comprises: two pressure rolling parts of face-off, make the nip of a wide area betwixt; And at least one side of this nip with the sizable electromagnet apparatus of nip area, make it to set up flux by nip to attract the parts of these two face-offs, on whole nip area, set up the nip load.

2, a kind of press of wide nip comprises: two pressure rolling parts of face-off define the nip of a wide area by it; Install parts and make its device towards another component movement; Walk around a row belt of parts, sail in one section and in nip, failed paper web; Have an electromagnet to set up the magnetic field by whole nip area in the nip in this section of above-mentioned belt, these two pressure rolling parts are pulled produces nip load together.

3, the press unit of a kind of wide nip of using of papermaking equipment comprises: Dui Zhi two conformal rigid members mutually define the nip of a wide area betwixt; Cross a row impermeability feed belt of this nip; Guide the device that a paper web makes it to pass nip to this belt; Be installed in the device at least one above-mentioned rigidity pressure rolling part place, can shift to another parts and give nip loading on its whole width; An electromagnet, pressure rolling part and a coil of having a heart body supporting to be close to nip, the latter encourages this heart body to form a magnetic field that is distributed on the whole nip area, two pressure rolling parts of face-off mutually can be inhaled and be pulled in together to give the nip loading, the foment that also has this coil of control is to keep the device of required nip load.

4, the extended nip press in the claim 1, a pressure rolling part of wherein addressing is a roller, another pressure rolling part is a thin non magnetic cover tile, and the electromagnet apparatus of speaking of has the heart body of this cover tile of rest.

5, the squeezer in the claim 1, pressure rolling part wherein are two heart bodies of the face-off of electromagnet apparatus.

6, the squeezer in the claim 1, electromagnet apparatus wherein have a top to have the heart body of open channel, and this trough holds a coil lead that encourages this heart body and function at least.

7, the squeezer in the claim 1, electromagnet apparatus wherein have a heart body with parallel unlimited inverted draw cut, and the lead-in wire of excitation coil is by this inverted draw cut.

8, the squeezer in the claim 1, calutron wherein by one by a row and the heart body of slidably forming that leans on by groove heart sheet.

9, the squeezer in the claim 2 comprises a kind of microporosity felt, and it amplexiforms with it when paper web is carried overpressure zone by described belt.

10, the squeezer in the claim 2, one of pressure rolling part wherein are paramagnetic material spares that rotates by described magnetic field, and the eddy current heating in magnetic field thus.

11, the squeezer in the claim 10 has groove and is used for discharging water in the nip on the roller wherein.

12, the squeezer in the claim 2 has groove and is used for discharging water in the nip on the belt wherein.

13, the squeezer in the claim 2, electromagnet wherein have a heart body that spreads all over whole wide area nip width.

14, the squeezer in the claim 2 comprises a pair of right described face-off and conformal pressure rolling part, and every pair defines a wide area nip of speaking of; And above-mentioned belt sailed gave all this kind nips and the continuous mutually device that passed these nips of paper web.

15, the squeezer in the claim 14 comprises the microporosity felt around paper web on the topped belt of those pressure rolling parts.

16, the squeezer in the claim 14, wherein each is a roller to one of the pressure rolling part of face-off mutually, and have one independently the microporosity felt drag and walk around each roller, topped this paper web of living when belt is carried paper web by nip.

17, the squeezer in the claim 1, one of pressure rolling part wherein are the rollers of a lamination, make heating phenomena reduce to Min. when it rolls across magnetic line of force district.

18, the squeezer in the claim 1, wherein magnetic line of force channel spacing is no more than about 0.36 inch between two parts.

19, the squeezer in the claim 3, heart body wherein are at least 4 inches wide.

20, the squeezer in the claim 3, electromagnet wherein have heart sheet and encourage the absolute coil of this heart sheet along whole nip length.

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