FI85521B - VALSPRESS FOERLAENGT NYP FOER EN PAPER MACHINE. - Google Patents

Description

1 85521

PAPER MACHINE P1TK AN IPPI NE N 7ELAPUR1ST1N VALSPRESS MED EÖRLÄNG1 NYP FÖR EN PAP PERSMA5K1 N

This invention relates to the technology of long nip Puri sti-5s for paper machines and the like, which utilize electromagnets with large surface area magnetic core surfaces extending as far as the long nip area on at least one side of the nip, while maintaining a centralized a magnetic field through an opposite compatible paramagnetic nip portion to generate or add a nip load to the paper web passing through the nip.

In particular, the present invention relates to long nip presses having electromagnets on one or both sides of the nip that form elongate area shoes that attract opposing mating members to minimize magnetic flux gaps between opposing portions to increase traction on the paper nip. grow.

Presses with long nips for paper machines are known in the art from, for example, the teachings of U.S. Patent 3,738,225, issued July 24, 1973, and U.S. Patent 3,783,097, issued January 1, 1974. In these representations, the impermeable belts carry the web through a long and wide nip formed by hydraulically loaded shoes or pads. Telescopic presses having electrodes that attract the opposite roll to generate a nip pile are also known, for example, from the teachings of U.S. Patent 3,456,582, issued July 22, 1969. Such magnetic presses 30 have only a line nip and large gaps are formed between the magnet and the opposite roll due to the thickness of the roll shell surrounding the electromagnet and the converging and expanding air spaces at the inlet and outlet of the line nip. These gaps significantly reduce the power of the electrode forming the nip load.

Therefore, it would be an improvement in this technique to generate pressures or loads in long nip presses with electromagnets having large massive cores in the immediate vicinity of the opposite magnetic member to minimize the gap between them to maintain the desired nip load generating a strong, wide magnet.

According to the present invention, a long press nip is formed for dewatering or calendering fibrous webs, such as paper, by magnetically pulling on a wide shoe on one side of the web, which may be in the form of a roll or a press shoe. The magnet core is 15 as wide as the wide nip region, forming or supporting the shoe closely and developing a centralized magnetic field across the entire nip region. The magnetic flux of the field travels along the shortest path to the opposite nipple member. The impermeable belt conveys a web through the nip, one or both surfaces of each of which may be covered by an absorbent felt for dewatering or may be in direct contact with the hard-to-roll roll during an anterating installation. The nip-forming component on the other side of the web can be moved under the influence of this magnetic flux generated by the magnetized electromagnet. Thus, in installations with an electromagnetic shoe and a roller, either the shoe or the roller must be movable, and in installations with an electromagnet on either side of the nip, one or the '*** - both magnets may be movable.

One aspect of the invention is to minimize the gap through which the magnetic flux must pass in order to form a nip load. This is accomplished by forming a shoe with an electromagnet such that. the magnetic flux need not pass through the surrounding roll 35 until it reaches the 3,85521 paramagnetic nip forming section on the other side of the nip. The shoe and the opposing portion have equally extending regions that increase and concentrate the magnetic inductance to pull both sides of the wide nip region together more effectively for 5 min.

Another feature of the invention is the use of separate electromagnetic cores along the length of the nip to compensate for irregularities in the nip loads caused by bending, uneven expansion, etc. of the components.

Yet another feature of the invention is the use of separate coils for the electromagnetic cores, which can be magnetized separately to adjust the loads along the length of the nip.

It is therefore an object of the present invention to provide dewatering roller presses and calenders for paper machines and the like in which nip loads are generated or added by electromagnetic shoes having a large surface area.

It is another object of the invention to provide dewatering presses and calenders for paper machines having wide-ranging magnetized nips that generate nip loads by magnetic attraction.

•. Another object of the invention is to provide a press. a rolling unit having a magnetized electromagnetic shoe forming a long nip together with a working magnetic roll and in which the gap between the electromagnet and the magnetic roll is as small as possible.

/. It is another object of the present invention to provide a long nip roll press for paper machines in which a nip having a wide surface area is formed by opposing electromagnets which improve the magnetic coupling of opposing rigid nip members.

4,85521

Yet another object of the invention is to provide an electromagnetic long nip roll press in which roll pressing loads are provided by centered magnetic line lines between opposing mating nip sections having a large surface area.

Other and more objects and features of the present invention will become apparent to those skilled in the art from the following detailed description, taken in conjunction with the preferred embodiments, of several best embodiments, taken in conjunction with the accompanying drawings. The precise objects of the invention appear from the appended claims.

Figure 1 is a schematic side view of a long nip roll press of the present invention with a movable electromagnet on one side of the nip and a ferromagnetic roll with a fixed shaft on the opposite side of the nip.

Fig. 2 is a schematic side view of a long nip roll-15 press of the present invention with a cm fixed electromagnet on one side of the nip and a ferromagnetic roll on the opposite side of the nip, the shaft of which can be moved.

Figure 3 is a schematic side view of a long nip double huppatela press with a ventilated nip.

20 Fig. 4 is a schematic side view of a long nip roll press of the present invention with electromagnets on either side of the nip.

Figure 5 is a schematic side view of a canter type roller press of the present invention.

Figure 6 is an isometric view of a movable electromagnetic shoe-2 unit for the roll presses of the present invention.

Figure 7 is an isometric view of another form of electromagnetic core for roll presses of the present invention.

I: 5 85521

Fig. 8 is a schematic longitudinal view of an electromagnetic shoe for the roll presses of the present invention having a plurality of separately magnetized coils with coils having expanded core ends for separate coil sheaths.

Figure 9 is an end view taken along line IX-IX of Figure 8.

Fig. 10 is a cross-sectional view taken along line X-X in Fig. 3.

Fig. 11 is a cross-sectional view taken along line 10 XI-XI in Fig. 3.

Figure 12 is a schematic side view of a roller press of the present invention having a plurality of long nips.

Fig. 13 is a schematic longitudinal sectional view of a lamella-roll press roll that can be used in the roll presses of the present invention to minimize heating.

Fig. 14 is a graph showing nip load as a function of electromagnetic magnetization and illuminating rises in magnetic couplings as the gaps between the electromagnetic core and the opposing magnetic member decrease.

• ·; ” The long nip roll press unit 10 of Figure 1 has an electromagnet 11 below a wide or long nip N and a ferromagnetic upper roll 12 on the opposite side of this nip. The impermeable belt 13 is pulled openly si 1 to ‘25 ’around the rollers 14, one of which, denoted by the letter M, may be pulled, and the other, denoted by *: ·: may be loaded with a spring to tighten the belt. The outer roll 15 guides the belt in its path, the upper part of which passes through the nip. The porous felt 16 is * · "· 30 drawn around the rollers 17 through the nip and supports the lower surface of the web as it passes through the nip. The ferromagnetic roll 12 rotates around a fixed horizontal axis 18 • ·» * * 6 85521 pair The electromagnet 11 is slidably mounted at its upper end in an open fixed trough-like housing 19 and the upper surface of the electromagnet is covered by a curved non-magnetic thin plate shoe 20, preferably formed of a stainless steel plate 1. This shoe 20 and between the belt 13 at the n-weather entry of the nip N.

As shown in Fig. 6, the electromagnet 11 is formed of a plurality of parallel iron or magnetic steel core blocks 22. The core blocks 22 are rectangular in shape, their bottom 23 and parallel sides 24 are flat and the upper end 25 is convex transversely. The blocks 26 have smooth surfaces 26 adapted to join each other in parallel.

Each block 22 also has a pair of spaced open top grooves 27 extending between opposite surfaces 26 of the block. These grooves terminate above the base 23 of each block. An electromagnetic coil 28 is wound through the grooves 27, terminating below the upper end 25 of each block and extending over the ends of the blocks, as shown.

• · ·.: · The grooved convex upper ends 25 of the blocks are covered with a thin non-magnetic sei 1a shoe 20 which is curved to fit 25 tightly to the upper ends of the blocks and which also has a downward pivot. lips 29 extending over and over the sides 24 of the blocks so that the impermeable belt 13 is guided evenly into and out of the nip N.

·; ··· The trough-like housing 19 open at its upper end is fixedly anchored 30 and extends across the entire length of the roll press unit 10 inside the belt loop 13. The electromagnet 11 * · “slides vertically in this housing and the side walls' * of the chute slidably guide the side walls 24 of the magnets 22 of the magnets 1, which are sealed to the chute by seals 30.

• «• * li 7 85521

Between the bottoms 23 of the blocks 22 and the bottom of the chute there is a closed chamber 31 which can receive pressurized hydraulic fluid from the pressure source 32 to push the electromagnet 11 and its cover 20 upwards from the housing 19 to provide an initial load on the nip N. Other means, such as screw spindles, springs or the like, can also be used to lift the electromagnet 11 to hold the cover 20 against the impermeable belt 13 and to form the initial load of the nip.

The coil 28 is magnetized through a current amplitude adjusting resistor 10R from a generator G or similar current source to provide inductor magnetization of the electromagnet to form a controlled flux that pulls the sliding electromagnet and its cover shoe 20 toward the magnetic roll 12 and provides the desired nip load. Since the core blocks 15 22 support the cover 20 and because these blocks are relatively sliding, the irregularities in the nip due to depression, thermal expansion and the like are equalized and the load of the blocks is uniform along the entire length of the nip.

In the long nip roll press 10a of Fig. 2, parts corresponding to the parts described in the cross aid 10 of the tel auxiliary 20 are denoted by the same reference numerals. However, instead of the ferromagnetic upper roller 12 being mounted on the fixed shaft 18 of the embodiment of Fig. 1, it is mounted on the shaft 18a supported by bearings on pivot arms 40 rotatable about the center 25, which are moved by ..; r hydraulic or pneumatic cylinders 42. In this way, the roller 12 rises or falls relative to the nip N.

Instead of the electromagnet 11a moving in the support 19, it is fixedly mounted on the support 19a.

As shown in Fig. 7, the electromagnet 11a has one /. a single core block 43 having a central groove 44 open at its upper end into which one branch of the electromagnetic coil 45 enters. The coil 45 therefore surrounds only one side of the block 43 and one branch thereof is in the groove 44, while the other branch is wrapped around the outer side surface of the block. The top of the spool is below the grooved convex top 46 of the block and this grooved top 46 supports the cover 20.

The tipping load of the nip N of the roll press 10a is provided by using a cylinder 42 to pull the ends of the arms 40, whereby the bearings of the shaft 18a are pressed down into the pressing nip relationship with the cover 20. The desired nip compression is then provided by magnetizing the coil 45 to form a magnetic flux which pulls the ferromagnetic roll 12 into the core 10 43 and provides a nip load. The web is passed through a press nip over an impermeable felt 13 which slides over the shoe 20 and the felt 16 covers the lower surface of the web in the same manner as in the tel press embodiment 10.

From these descriptions of the telecom embodiments 10 and 10a, it will be appreciated that the nip load may initially be generated by pressing the electromagnetic core against the shoe 30 on one side of the shoe or by pressing the roll 12 against the shoe on the other side of the nip and then magnetizing the electromagnets with a dense and centered magnet. over the entire nip area to pull the magnet and roll together to provide an increased nip load.

The tel auxiliary 10b of Fig. 3 has parts corresponding to the parts shown and explained in Embodiments 10 and 10a by the symbols-.1. with the same reference numbers. However, embodiment 10b is a double shoe helper n in which the web passes through the nip N between the lower felt 16 and the upper felt 50, which upper felt 50 rotates around the lower part of the roll 12 and is guided by the guide rollers 51 to meet the web W as it enters and departs from the nip N. from the web as it exits the nip.

To facilitate the removal of compressed water from the web W from the long nip N, the roll 12 has circumferential grooves 52 which form channels for the flow of water from the nip N, as shown in Fig. 10.

• · • 1 · • · · I; · · • · • · 9 85521 The impermeable belt 13 may have longitudinal grooves 53 to form channels for removing water from the nip, as shown in Fig. 11.

It is clear that either the roller 12 or the belt 13 or both 5 can be provided with grooves.

It will also be appreciated that the tel press 10b may have a movable roll 12 and a fixed electromagnet 11a of the roll press 10a instead of the fixed roll 12 and the movable electromagnet 11 of the roll press 10.

The long nip roll press 10c of Figure 4 comprises the same components as described and described above, and the same reference numerals have been used to identify the components. In the tel press 10c, the roll 12 has been replaced by a movable electromagnet 11 and the trough-like 1a support housing 1a 19. This magnet slides in the housing 19 and acts via the shoe 20 to form the upper surface of the long nip N. The impermeable upper felt 60, which is pulled around the guide rollers 61 and the traction roll 62 as an open loop surrounding the housing 19, has a lower run extending through the nip 20 under the upper shoe 20.

. The fixed electromagnet 11a is surrounded by an impermeable belt 13 passing over the lower shoe 20, the lower part of which forms a loop. The web W is passed through the nip between the felts 13 and 60. A lubricant can be fed between the felts and the shoes 20 at the nip inlet. under.

: Y: Y1 The electromagnet 11 can slide under gravity in the housing 19 to form an adult nip load. In addition, the initial load can be increased by hydraulic fluid, ... springs or mechanical screws which push the electromagnet 11 out of its housing 19, as will be explained in the embodiment Y of the embodiment of Fig. 1.

The fixed garden electromagnet 11a may be the single-core end coil 45 shown in Fig. 7 with an external hook 85521 ra, or it may be constructed as shown in Fig. 6.

The lower belt 13 is expediently pulled by a traction roller 63 on which a nip loading roller 64 is mounted, so that the belt 5 passes through the nip between the rollers 63 and 64.

There is also an absorbent fiber felt 65 between the top belt and the web W.

When the coils of the electromagnets 11 and 11a are magnetized, the cores of these magnets are pulled or pushed together, thereby pushing the shoes 20 on opposite sides of the web towards each other and loading the nip to provide the desired compression. Because there are electromagnets on each side of the nip, the attraction is considerably greater, probably twice the force obtained in embodiments 10, 10a and 10b, where only one side of the nip has an electromagnet.

The roll press 10d of Fig. 5 shows a calender roll embodiment of a dry web D.W. threaded through a nip N between a fixed calender roll 70 rotated about a fixed axis 71 and a movable electromagnet 11 carried in a housing 19 as described above. for surface treatment. The electric magnet 11 is covered by the non-magnetic shoe 20 described above, which in turn supports the belt 13 which carries the web D.W. through nip N. The controlled magnetization of the electromagnet 11 25 provides the desired caliper roll load on the dry web D.W. for processing.

As shown in Figs. 8 and 9, the electromagnetic load 20 of the shoe of the long nip roll press or calender press described above can be obtained by a modified; an electromagnet arrangement 1 to 80 formed by a plurality of; electromagnetic core blocks 81, each with its own ....: a separate magnetizing coil 82. As shown, the iron or steel magnetic core blocks have parallel, upper * * · li "85521 open grooves 83 which enter the coil 82, then For the free space between the adjacent core blocks 81, the blocks have ends 83 extending over their front and rear openings, thus creating slots or spaces 85 for the coils 82 without wide openings under the cover 20. cracks or spaces.

As schematically shown in Fig. 8, the ends of each coil 82 can be magnetized separately from the power supply 86 10 via controllers 86a to change the power supply to each coil as desired. In this way, the cores 81 positioned along the length of the nip can apply selected loads to the inserts of the shoe 20 along depressed rolls, non-uniform expansions, etc. along the length of the nip.

15 to compensate for fluctuations in nip pressures caused by.

It should be noted that the gaps between the nip and the magnetic cores are minimal, as the cores act only through very thin non-magnetic shoes to create flux lines that develop traction with opposing fer-20 magnetic magnets or cores. In addition, these flow lines have only a very short distance between opposite sides of the nip and are centered over the entire nip area, without passing through all the air gaps formed on the inlet and outlet side of the nip. In the long nip roll presses of the present invention, the width of the surface area of the extended nip is adjusted by the width of the shoe, and the entire region has a magnetic field that passes directly through the region without passing through the air gap, albeit non-magnetic through the nip. 30 material forms a very small gap.

: The tel auxiliary 1 0 e in Fig. 12 has a series of nips N into which: the web successively enters. Components identical to those shown in Figures 1-4 in the tel. 10, 10a, 10b and 10c. are marked with the same reference numbers. As shown, the tel press 10e has three nips N, each formed by a roller 12 and a movable electromagnet 11 in the trough housing 19, with a thin non-magnetic shoe 20 covering the core blocks 22 and a pressurized chamber 31 pressing the magnet and the shoe toward the opposite roll to provide a nip time load. A separate compression felt 90 is wound around each roll 12 through a nip formed by the roll and the opposite shoe 20. As shown in connection with the third roll 12, each felt 90 is wound around rollers 91, one of which may be drawn, such as roll M. External tension roll 92 keeps the loop tight and the outer guide roller 93 keeps the loop on the path leading around the roller 12 and the rollers 091. The upper run of a simple impermeable loop felt passes over all three nips N, the traction roll 95 and rollers 96 after the last nip N, and the guide roll 97 along its lower run back to the front nip N.

The magnets 11 can be magnetized to apply higher nip loads-20 in successive nips N.

The rollers 12 of the tel auxiliary presses 10e can be replaced with electromagnets, as in the tel auxiliary press 10c of Fig. 4.

• · · * · • · * * *: · Auxiliary blankets 10, 10a, 10b, 10c and 10e can be: Y: replaced with a porous metal strip (not shown) and thus further reduce the distance between the opposing rollers of the nips: non-magnetic crevices. In addition, tel auxiliary stimuli and calender stack arrangements can be omitted to reduce gaps, but because they are very thin, suitable for keeping lubricating fluid away from magnetic coils, and tapping the nip surface, they are a desirable addition.

As shown in Fig. 13, the present invention can be performed; in press clamps, a press roll 12a is used to minimize the heating of the nip caused by the eddy currents. The roll 12a • · • Λ · 13 85521 has a cylindrical steel core 98, the ends of which have shafts 99a rotatably supporting the roll. Around the heart is a stack of thin lamellae that the ends 99 squeeze together. The stacked lamellae 100 are intermediate rings about 0.1-0.5 mm 5 thick and about 50-75 mm wide. They fit snugly on the core 98 and are made of a metal that does not generate eddy currents in the magnetic field generated by the electromagnets. Such eddy currents develop in paramagnetic metal alloys and heat the roll as it is rotated in a magnetic field. When heat is not desired, rolls such as rolls 12a are used.

Useful materials for the lamellae include oriented iron, which forms an oxide coating on the surface of the thin spacer rings 100, non-crystalline or amorphous ferrites, and the like.

Figure 14 illustrates the increases in magnetic attraction that make it possible to reduce the gap through which the magnetic field must pass. Therefore, as shown in the graphical diagram 101, plotting the induction-20 rimagnetization at 0-14000 amperesis to abscissa 102 and the static attraction N / linear cm ordinate 103 greatly increases the attraction as the gap decreases from M: 19 mm to 3.2 mm. . An extrapolation of the 3.2 mm curve to 14,000 amperes shows that the electromagnets used in the longitudinal telecom unit of the present invention are capable of producing a force of 900 N / (linear); . cm and this force can be approximately doubled by two mutually attracting magnets, as in the tel auxiliary clamp unit 10c of Fig. 4.

The telimeter 11a of the present invention is provided in that a stack comprising non-magnetic shoes of nips N; belts, blankets and webs, are the gaps between the magnetic cores and the Ferro magnetic rolls or opposite magnetic cores • · «» · 1.27-9.1 mm. As explained above, an impermeable belt can pass through the electromagnet-lubricated magnet core branch i 1 1 a, so that the shoe 20 can be omitted. However, the shoe helps keep the butter liquid away from the coils. In such units, the thickness of the shoe is only 5 at most about 3.18 mm, the thickness of each belt is 0.50-2.54 mm, and the thickness of the webs is naturally insignificant, i.e. in the order of 0.05-0.25 mm. The impermeable belts are preferably made of rubber or plastic, such as polyurethane, but may also be thin impermeable metal strips, further reducing non-magnetic gaps. As explained above, the felts can be replaced with thin, porous and flexible metal strips into and through which the effluent water can flow and thus further reduce cracks. The shoes 20 may be of any non-magnetic material such as hard rubber, plastic, stainless steel or the like. The machine direction width of the shoe may vary depending on the conditions, but it is wide enough to generate a wide magnetic field. A reasonable minimum width is about 100 mm and a maximum width of about 450 mm.

20 The width transverse to the machine direction of the shoes can vary from narrow to the overall width of the machine. The full-width shoe should be flexible in the transverse direction of the machine to accommodate irregularities in the belts, felts, web, and the interconnected surfaces of the roll and magnet core. If desired, the shoes can always be placed at a distance of 150 mm from each other.

As explained above, heat is generated in the rotating magnetic field of the metal rolls, which can be useful in wet presses. If heat is not desired, the rolls 1 can be coated as shown in Fig. 13 and as explained above.

** 'It will be apparent from the foregoing description that the present invention provides long nip roll presses for the treatment of wet or dry fibrous webs in which nip loading is provided. or it is augmented with electromagnets having cores which act only through very small slits, developing flow lines across the entire wide nip region and which pull the opposite sides 5 of the nips towards each other to provide the desired nip load over the entire width and length of the long nip.

«♦ 1 • 1 1 • · • 1 1 * m · • · • 1 1 • ·

Claims (13)

A long nip roll press (10, 10a, 10b, 10c, 10d, 10e) for a paper machine, comprising opposing mating nip portions (12, 20, 22) forming a wide nip (N) therebetween, characterized by , that at least one side of the nip (N) has electromagnetic members (11) extending as wide as the nip (N), which develop a flux through the nip (N) to attract the opposite nip portion to form a nip load over the entire nip area. 2. Valspress med förlängt nyp enligt patentkravet 1, kän n -netecknad av att en av nypdelarna är en Vals (12), den andra nypdelen ei en magnetisk sko (20) oct det electromagnetiska medlet (11) har en kärna (22 ) som stöder skon. A long nip roll press according to claim 1, characterized in that one of the nip parts is a roll (12), the other nip part is a thin non-magnetic shoe (20) and the electromagnetic member (11) has a core (22) supporting the shoe. 3. A press according to claim 1, which comprises a rotary device according to the electromagnetic medium (11). Roll press according to Claim 1, characterized in that the nip parts are opposite cores of the electromagnetic elements (11). 4. A valve according to claim 1, which comprises an electromagnetic set (11) with a core (22) with an upstream spring (27) for use with a ring (28) for magnetizing the core (22) . Roll press according to Claim 1, characterized in that the electromagnetic element (11) has a core (22) with an open groove (27) at its upper end, into which at least one branch of the magnetizing coil (28) of the core (22) enters. 5. Valspress enligt patentkravet 1, kännetecknad av att det electromagnetisk medlet (11) haren kärna (22) mediellell upptill öppna springor (27) samt en magnetiserande *: 1: slinga (28) med grenar som sträcker sig genom springorna (27) ). Roll press according to Claim 1, characterized in that the electromagnetic element (11) has a core '1 (22) with parallel grooves (27) open at its upper end; and a magnet coil (28) having branches extending through said "1 / grooves (27). 6. A valve according to claim 1, which comprises an electromagnetic device (11) which is preferably connected to a side of a placebo block (22) with a spring. Roll press according to Claim 1, characterized in that the electromagnetic element (11) has a core consisting of a row of parallel grooved blocks (22). • · • · • · 1 7. Valspress enligt patentkravet 1, kännetecknad * · av atten av avpdelarna är av paramagnetiskt material som * roteras genome det magnetic magnetic field and upphettas av rope-. : strömmarna i fältet. • · A roller press according to claim 1, characterized in that characterized in that one of the parts of the nip (N) is a paramagnetic • · · i7 85521 material which is rotated through said magnetic field and heated by eddy currents. 8. A roll according to claim 2, which comprises »1« • · · · 9 85521 in which a roll (12) is provided with a spar (52) for turning the water (N). Roll press according to Claim 2, characterized in that the roll (12) has grooves (52) for removing water from the nip (N). A roller according to claim 1, comprising a electromagnet (11) having a core (22) having a strap according to the invention with a ring (N). Roll press according to Claim 1, characterized in that the electromagnet (11) has a core (22) which extends over the width of the region of the long nip (N). A roller (1) according to claim 1, which comprises a minimum number of rollers (12a) with a minimum of uptake in the rotary genome. A roll press according to claim 1, characterized in that one of the nip parts is a laminate roll (12a) which minimizes heating as the roll rotates through the flow. 11. A press according to claim 1, which is rotatable with a flattening machine having a diameter of about 9.1 mm. A roll press according to claim 1, characterized in that the gap between the parts does not exceed a value of about 9.1 mm. 12. Valspress enligt nägot av de föregäende patentkraven, kännetecknad av att kärnans bredd är minst ca 100 mm. Roll press according to one of the preceding claims, characterized in that the width of the core is at least about 100 mm. Roll press according to Claim 1, characterized in that the electromagnet (11) has core blocks (22) and separate coils (28) which magnetize the blocks along the length of the nip (N). **** 1. Valspress med förlängt nyp avsedd för en pappersmaskin, «· ·: vilken valspress (10, 10a, 10b, 10c, lOd, lOe) omfattar mot-. · 1. : the corresponding names in the pin (12, 20, 22) are defined by • · · ^. sig ett nyp (N) Över ett Brett omräde, kännetecknad • · · · • 1 • · * 1 1β N), a single field generator and a magnetic field of the genome (N), for the purpose of drawing a node for the use of a node-type and nyling utilization of the node. A press according to claim 1, comprising electromagnets (11) having a core block (22) and an individual sling (28) with a magnetic block on a slope (N). * • · 1 · · • ·