SE514419C2 - Method of a machine arrangement in a machine for manufacturing a patterned continuous web of cellulosic fibrous material and machine arrangement - Google Patents

Abstract

The invention relates to a method associated with a machine arrangement in a machine for production of an imprinted continuous web (1) of fiber material with a cellulose content, preferably a soft paper web, at which a wet web (1) is fed through a roll nip (34) together with at least one endless clothing (32, 35), which, or of which at least one have the ability to receive and to transfer away water from the web (1) and that the roll nip (34) is a web (1) imprinting roll nip (34) and that the wet web (1) has a low enough dry solids content to allow remolding of fibers in the web (1) during the passage through the roll nip (34), so that the web (1) acquires a structure with areas with different density, after which the clothing or the clothings (32, 35) are transferred away from the web (1) after the roll nip (34), the web (1) is dried with at least an essentially maintained structure, and the dried, imprinted web (1) is reeled up in a reel-up (2). The characteristic features of the invention is that the web (1) is pressed and dried in a heat press (50), which have at least one heat transfer device (6, 45, 54) with a heatable surface (7, 51, 59), which is heated up by a heating device (38), and which surface (7, 51, 59) is in contact with the web (1), which heatable surface (7, 51, 59) runs through the roll nip (34) together with at least one clothing (32, 35) which feeds the web (1) so that the web (1) is enclosed between the clothing (32, 35) and the heatable surface (7, 51, 59) and which heat press (50) is integrated with the reel-up (2).

Description

Determined dry matter by heat application. Finally, the web is rolled up in a wheelchair to a finished material hole. In all runway crossings between two consecutive machine sections, the runway must be moved over a greater or lesser distance from one drive section to the next. If the web then lacks support, for example from a blanket or other machine clothing, the transfer is called an open draw. At the open draw, the track must carry its own weight and withstand increased stresses caused by speed differences between the actual drive sections. The risk of track breaks with consequent costly production losses is high and open draft should therefore be avoided.

In recent years, press sections have been developed which, without appreciable stress on the damp paper web, have made it possible to feed the web from the forming portion of the paper machine to and through all the press nips. Due to the gradual increase of the dry content of the web during the passage through the press section, the strength of the web increases as it does. Despite this fact, the web is still sensitive to the increased stresses that occur during transfers between different process sections. In the case of a conventional wet press, in addition, there is always a certain re-flattening of the web at the outlet from the respective press nip, which impairs the achieved strength. A higher dry content of the real web, already at an early stage of the manufacturing process, and a machine design that is completely unaffected by transmissions and open strokes would lead to a reduced risk of web breakage, a higher web speed and thus a very significant increase in production with consequent gains. for the paper industry, as well as a higher bulk and better quality of the final product for tissue.

Furthermore, in the manufacture of paper, cardboard and board, a very elongate drying section is usually used today, which has a large number of alternating drying cylinders and guide rollers, namely which the moist web runs during heating and evaporation of water. In the manufacture of tissue paper, which has lower basis weights and which is used, for example, for the manufacture of kitchen paper, paper towels and other hygiene products, a drying section is used instead, which comprises either a single, from the inside steam-heated drying cylinder with a relatively very large diameter and a polished surface. i.e. and s.k. Yankee cylinder, against which the web abuts for the main drying of the web, or a combined machine, which consists of both Yankee cylinder and a number of ordinary drying cylinders in succession. A blow-dryer, TAD, can also be used for said drying, but the TAD dryer has its disadvantages, such as high, costly energy consumption and a bulky size. The large number of drying cylinders, or, in the manufacture of tissue paper, the large diameter of the Yankee cylinder of up to 6 m, gives an unfavorable length of current paper machines. For the Yankee cylinder, a considerable machine height is also added.

However, there have been local attempts to reduce one or more of the above-mentioned problems. For example, from US-A-4,324,613 it is known that pressing a wet fiber web in a hot press at elevated temperature and at the same time high pressure, leads to a number of beneficial effects, for example greatly increased dewatering speed and thus a shortened drying section. What is in the present context called "hot press", and which constitutes an integration between a press and a drying device, is incorrectly called by many as "impulse dryer". The patent describes a press nip heated from the outside, which is formed between two mutually movable cylindrical rollers, one of which has a high surface temperature. The combination of high temperature and at the same time high pressure gives a high heat fl fate to the web, which results in the high dewatering speeds. The good dewatering result is probably due to the fact that the strong steam formation at the press nip helps to push the remaining liquid out of the web, that the elevated temperature gives a reduced viscosity of the water and / or that the water, which under the influence of the press nip pressure reaches a temperature of over 100 ° C, rapidly evaporates when the press pressure ceases as the web leaves the press nip.

However, the residence time of the paper web in a conventional press nip is too short to be able to take any real advantage of the beneficial effects of hot pressing. From the patent specification US 5,393,384, however, a paper machine for the manufacture of tissue paper is known, in which one of the embodiments shows a shoe press with a press shoe, which acts against a heated drying cylinder. Since the press nip at the shoe press is extended to about 20 to about 30 cm, the heat treatment under pressure is substantially extended.

Furthermore, in the production of tissue paper, it is a common desire that the ratio between the volume and the weight of the paper, i.e. the bun, must be substantially higher than other paper, as high-bulk paper has a desirable combination of both softness and good absorbency.

Attempts have been made to produce tissue paper with significantly increased bulk. For example, U.S. Patent No. 3,806,406 discloses a method and apparatus for forming a high bulk tissue web. A damp web is advanced on a igenom lt through a press nip between a press roll and a heated Yankee cylinder. When pressing the banber web gives an undesirably low bulk for tissue, attempts have been made to reduce the web surfaces subjected to pressure. The mantle surface of the Yankee cylinder therefore comprises alternately raised and lowered surface portions, which form a relief pattern for application to the fi berbanan. Essentially, only those parts of the web which abut the raised surface pastes are compressed, while the intermediate parts are left relatively unaffected. Essentially the entire drying takes place thermally through the heat supply from the Yankee cylinder, while the tissue paper web is kept in an xt position relative to the surface portions. The web thereby acquires a certain texture, ie. a specific pattern of compressed and non-compressed surface portions, which surface portions correspond to the current relay pattern of the mantle surface. The web then also receives the desired, elevated bulk.

However, the Yankee cylinder has a couple of significant disadvantages. One problem, as mentioned above, is that the Yankee cylinder has a large diameter, so it is very bulky. Another problem is that when using a Yankee cylinder, it is difficult to achieve the very high temperatures used in hot pressing. Although the steam inside the cylinder can have a very high temperature, only about 95 ° C to about 100 ° C is obtained on the cylinder surface, so in most cases additional heat from external dryers, for example by blow drying, must be added to the drying process either before or after the Yankee cylinder. The jacket of the Yankee cylinder must, in order to withstand both the internal vapor pressure and the external press pressure against the jacket surface, have a considerable thickness of between about 50 to about 100 mm. This thickness, together with the large diameter, provides a large mass of material, which must be heated and which effectively prevents the heat from the inside of the cylinder to its mantle surface. A further problem is that it is difficult to maintain the geometric shape of the roll across the machine direction due to difficulties in maintaining the same temperature along the mantle surface of the roll as on the ends. Since the mantle surface and the ends can not expand freely independently of each other, large stresses arise between them, so that the mantle surface becomes arcuate outwards or inwards across the machine direction. Since the inner parts of the roller will also absorb some of the supplied heat energy, the construction described will thus be very energy-intensive with high fuel costs as a result.

U.S. Pat. No. 5,830,316 discloses a method and apparatus for manufacturing a textured tissue web, transporting a moist pressber web cage carried by an endless machine cladding capable of receiving and transporting water from the web through a texturing wet press web. The fibrous web is so moist that it allows repositioning of fibers in the web at the passage through the wet press nip, so that the web has a patterned structure. The web still moist from the wet press is then dried with the structure obtained substantially maintained to a drying section where the web is dried, which drying section may comprise a blow-through dryer and a Yankee cylinder, from which later the dried web must be creped. which gives an inaccessible open pull, before the track can be rolled up. The construction has fl your disadvantages, the wet press tends to moisturize the fi berbanan, the hot press technology is not used and open drafts remain.

A further process for hot pressing a tissue web is described in U.S. Patent No. 5,556,511. A tissue web is passed together with an t lt for absorbing liquid from the web through a press zone, which web is heated before or inside the press zone. The sudden expansion of the water vapor in the web as it leaves the press zone is considered to cause a delamination, which improves the volume and softness of the web, i.e. increases the bulk of the track. Additional heat can be supplied to the web after the web leaves the press zone by means of dryers arranged therefor. Since the drying cylinder has a smooth mantle surface, to which the web easily adheres, the dried web is creped from the drying cylinder by means of a creping scraper. A creped fi berbane, which is substantially dry on creping, does not acquire the favorable rewetting properties of a fi berbana patterned in a still moist condition, but the creped web loses the favorable structure obtained in creping after it has been allowed to absorb water. A further and most significant disadvantage is also that another inefficiently open pull is created from the crepe scraper to the wheelchair, over which the web must be passed before the final winding to the finished roll can take place.

It will be appreciated that a paper machine comprising fl your separate portions of one or fl your wet presses, a number of drying cylinders of different sizes, a wheelchair with a relatively large support roll and in addition a number of open pulls or transfers between said machine portions have an unfavorable length, a deteriorated paper quality and a significant risk of web breaks and thus lower production. These disadvantages, together with increased demands for higher bulk and lower energy consumption during drying, have led to a desire for a shorter, faster and more production-safe machine construction.

OBJECTS AND FEATURES OF THE INVENTION The object of the present invention is to provide a machine arrangement in a machine for manufacturing a continuous fi web, which machine arrangement substantially reduces the total machine length, eliminates the remaining transmissions and open features of the machine roller. reduces the other problems mentioned above, including wetting problems, high heating costs and lack of 10 15 20 25 30 35 r '"^' - '- L'» _ e. 2 ,. - - - - - ««. F,, _ i; nya .- - '' ~ - - ~ .- -. ~ ~ .'- t. ._ ... ._. _ * F * '' »« W _; ~. <V. '* V'.

The method according to the invention is characterized in that the web is pressed and dried in a hot press, which has at least one heat transfer device with a heatable surface, which is heated by a heating device, and which surface abuts the web, which heatable surface runs through the nip together with at least one machine cover. as for the fiam fi berbanan so that the fiberbanan is enclosed between the machine cladding and the heatable surface and which hot press is integrated with the wheelchair.

The machine arrangement according to the invention is characterized in that the press and the drying device are integrated with each other to form a hot press, which has at least one heat transfer device with a heatable surface which is arranged to be heated by a heating device and which surface is arranged to abut the web and pass through the press nip. at least one machine cladding arranged to carry the cableway and enclose the cableway between the machine cladding and the heatable surface and which hot press is integrated with the wheelchair to form said machine arrangement.

With the present invention it is achieved that the machine arrangement becomes completely free from open strokes and transfers from the press section up to and including the finished material roll, - that the machine arrangement becomes very compact, ie. that a significantly shortened total machine length is obtained compared to previous machine designs, as well as - that expensive and unnecessarily energy-intensive machine parts, such as the Yankee cylinder and the long conventional drying section with several drying cylinders or each other are eliminated, so production becomes both faster and energy efficient, particularly favorable properties such as higher bulk are obtained, which bulk also remains after a rewetting of the ñber track with qualities similar to those of the TAD dryer, but considerably cheaper.

LIST OF FIGURES The invention is explained in more detail in the following with reference to the drawings.

Fig. 1 is a schematic side view of parts of a machine arrangement according to a first embodiment of the invention comprising a hot press and a wheelchair, which wheelchair especially comprises a support roller with a smooth sheath surface, and which hot press comprises heating means, a press, which in particular comprises a cylindrical press roll, and a machine cladding in the form of a pattern carrier, which press roll, the jacket surface and the pattern carrier form a heated, embossed, pattern-shaped press nip which is heated by the heating means. Some parts of the machine arrangement are cut away to better illustrate the invention.

Fig. 2 is a schematic side view, according to a second embodiment of the invention, of parts of a machine arrangement, which has a press, which in particular comprises a shoe press roll, and a support roll, which is axially enclosed by a loose sleeve with a smooth jacket surface, which shoe press roll and which jacket surface replaces the press roll and the jacket surface according to the embodiment shown in Figure 1.

Fig. 3 is a schematic detail view of parts of the machine arrangement according to the embodiment shown in Figure 2, which detail view shows a shoe press roll, a support roll comprising a loose, heated sleeve, a movable pattern carrier, which transports a fi berban through a heated, fi berbanan embossing press nip, and a winding roller on which a roll of material is being wound against the jacket surface of the sleeve.

Fig. 4 is a schematic detail view of parts of a machine arrangement according to a third embodiment of the invention, in particular comprising a relief-patterned, heated support roller, which relief pattern constitutes a second pattern carrier for forming a double-sided pattern embossing press nip.

Fig. 5 is a schematic detail view of parts of a machine arrangement according to a fourth embodiment of the invention, in particular comprising a loose, relief-patterned, heated sleeve, which relief pattern constitutes a second pattern carrier for forming a double-sided patterned embossing press nip. in Figs. 6 and 7 are schematic detail views of parts of two different machine arrangements according to a fifth and a sixth embodiment of the invention for the formation of a banberban one-sided pattern embossing press nip, with relief-patterned roller and sleeve, respectively.

Figs. 8 - 11 are schematic detail views of parts of different machine arrangements according to a number of further embodiments of the invention, all of which comprise a pattern carrier, which consists of a heatable patterned endless belt arranged in a loop around the stretcher roll, but which differs with respect to the number pattern carrier and presence of sleeve. DESCRIPTION OF THE EMBODIMENT Figure 1 shows diagrammatically in side view parts of a machine arrangement of a paper machine for the manufacture of a continuous web 1 of cellulosic carrier material, preferably a tissue web, according to a first embodiment of the invention. The machine arrangement comprises a wheelchair 2 for winding the web 1 on winding rollers 3 to finished rolls of material 4, preferably rolls of tissue paper. The wheelchair 2 comprises two identical, elongate and spaced apart parallel frame parts 5, of which only one is shown, for supporting the winding roller 3 at its ends; a support roll 6 arranged at the wheelchair 2, seen in the feed direction of the support track 1 upstream, between the frame parts 5, which in the embodiment shown in Figure 1 is especially comprised of a support roller 6 with a smooth jacket surface 7, over which jacket surface 7 the web 1 is arranged to run to one of the winding rollers 3, or a material roll 4 formed thereon, growing thereon. The described wheelchair 2 is usually called both cylinder wheelchair or support roller wheelchair, so the term "wheelchair" has been chosen for this description. The support roller 6 is rotatably mounted at two bearing housings 8, which are located one at each frame part 5. A drive motor (not shown) gives the support roller 6 a peripheral speed, which corresponds to the feed speed of the web 1. The diameter of the support roller 6 is in the order of about 1.0 to about 3.0 m.

The wheelchair 2 further has two systems for maintaining a continuous production of wound roller track 1, namely a primary system 9 for receiving new, empty winding rollers 3, and a secondary system 10 for taking over the winding roller 3 with the material roll 4 started therefrom from the primary system 9 for continued winding to finished material hole 4. The primary system 9 is then arranged to guide the winding roller 3 along the periphery of the support roller 6 down to the horizontal frame parts 5, where the secondary system 10 takes over the control of the winding.

The primary system 9 comprises a pair of parallel, elongate primary arms 1 1, which are rotatably arranged at the respective frame part 5 at the bearing housing 8 of the support roller 6 by means of each actuator 12. The primary arms 11 are shown in Figures 1 and 2 with certain parts cut away to better illustrate underlying details. of the machine arrangement.

A supply 13 of empty winding rollers 3 is arranged at the upstream end of the wheelchair 2 and above the support roll 6, from which roll supply 13 the primary arms 11, in the embodiment shown, are arranged to transfer an empty winding roll 3 for application to the supporting web running over the driven support roller 6. 1 for initiating the winding of the web 1 as the downstream growing material roll 4 approaches a predetermined size. Alternatively, in an embodiment not shown, instead a pair of laying arms are arranged at the roll supply 13, via which laying arms the winding roll 3 is arranged to be transferred to the primary arms 11 before said application to the support roll 6. The secondary system 10 comprises, in the embodiments 1 and 2 , a pair of secondary carriages 14, which are arranged linearly displaceable along the outside of the frame parts 5, determined by the diameter increase of the material roll 4. said diameter increase of the material roll 4 (not shown).

The secondary carriages 14, which are mirror-inverted relative to each other and the frame parts 5 each comprise a vertical platform 15, which has bearings mounted on the side facing the frame part 5 for co-operation with rails 16 arranged at the frame part 5.

Each section trolley 14 further comprises an actuator 17 for enabling the linear reciprocating movements of the secondary trolley 14. The actuator 17, which may be, for example, a hydraulic or pneumatic cylinder, is attached at one end to the secondary carriage 14 and with its other end to the frame part 5. The movements of the two secondary carriages 14 along the rails 16 are, like the primary arms 11, synchronized with each other. . Each second trolley 14 comprises an operable gripper 18 for receiving and gripping the winding roller 3, which gripper 18 is arranged at the outside of the platform 15. Each gripper 18 comprises a locking arm 19 and a pressing arm 20 arranged downstream of the locking arm 19, which arms 19, 20 are rotatably arranged at the secondary carriage 14 and which arms 19, 20 each have actuators 21, 22. The pressing arm 20 is arranged to press against the end of the winding roller 3 for maintaining a predetermined line of pressure in the nip between the support roller 6 and the material roll 4, hereinafter also referred to as the first press nip 23, during the growth of the latter. Along the upper edge of each frame part 5 a horizontal rail 24 is fixedly mounted.

The two rails 24, which are parallel, are intended to support the winding roller 3 at its ends during the movement of the secondary carriage 14 in the direction of the support roller 6. Alternatively, the winding roller 3 may instead rest on a separate rail element (horizontally arranged at the upper edge of each secondary carriage 14). not shown) during the actual winding in the secondary system 10, was transferred to the rails 24 for further transport out of the wheelchair 2 when the material roll 4 is completed. and thus the material roll 4 under construction. The center driver is thus linearly displaceable together with said secondary carriage 14 in a direction parallel to the rails 24. The primary system 9 can also be equipped in the same way with a center driver (not shown) for an initial acceleration and there are fis for maintaining the same peripheral speed of winding v as in the support roller 6, whereby undesired frictional forces in the press nip 23 are avoided.

Correspondingly, each primary arm 11 also comprises an operable gripper 25 for gripping and holding each new winding roller 3 during its transport down to abut against the support roller 6 and further during its continued movement along the periphery of the support roller 6 down to the rails 24 of the frame parts 5, or rail elements. The gripper 25 is arranged at a primary carriage 26, which is linearly movable along the primary arm 11 by means of an actuator 27, which linear movement is determined by the diameter of the material roll 4 growing on the winding roller 3 during the initial winding in the primary system 9 and the required change of the gripper 25. position along the primary arm 11 in the movement along the support roller 6. As with each secondary gripper 18, each primary gripper 25 comprises a locking arm 28 and a pressing arm 29, of which at least the locking arm 28 is operable by means of an actuator 25 for opening or locking movement.

The machine arrangement further comprises a press 30, which is arranged in connection with and upstream of the support roller 6, a drying device 31 for drying the web 1, which press 30 and which drying device 31 are integrated with each other to a hot press 50 with a nip 34 therebetween, and at least a machine cladding, which leads the fi berbanan 1 to the press nip 34. In order to achieve wet embossing of the fi berbanan 1, one should have at least one patterned surface, which is opposite the fi berbanan 1. The patterned surface can be constituted by a "pattern carrier" in various embodiments, such as an embossing wire. 32 or a process belt, or a patterned surface of the drying device 31, comprising the casing surface 7 of the carrier roll 6 or the surface of the loose sleeve 45 or their combination. By "pattern carrier" in this context is meant a device, which is arranged to give a still moist fi berbana, ie. before the main drying of the web has taken place, a certain texture, i.e. a pattern embossing which gives a definite embossing pattern of compressed and non-compressed surface portions, which surface portions correspond to the actual pattern of the pattern wearer. The fibrous web then also receives the desired, elevated and lasting bulk, since a pattern embossing of a moist fi berban, and a subsequent drying without the resulting structure being destroyed by the so embossed fi berban, gives said high bulk, while the structure remains even after the fi berban has been allowed to absorb water.

By “moist fi berbane” is meant that the fi berbane has a sufficiently low dry content to allow re-storage of fi fibers in the web during the passage through the press nip, so that the web obtains a structure with areas of different density.

The press 30 is particularly, but not exclusively, included in a paper machine for producing low basis weight paper, i.e. and tissue paper. However, the paper machine may be designed for the production of any other paper grades. The press 30 comprises a press device 33 for pressing cooperation with the support roller 6 via a press nip 34 formed upstream of the side facing the support roller 6, hereinafter also referred to as the second press nip 34, an endless machine liner for receiving and transporting liquid from the web 1 in surface form or gaseous form out of said press nip 34.

The machine liner usually consists of a press 35 having a substantially smooth surface, but may also be an embossing wire 32 which is either permeable, with through openings and possibly between these located or extending recesses, or impermeable with recesses of suitable finite depth. , shape and stretch. The said recesses are found on the side closest to the track 1. In some embodiments of the invention described in more detail below, the press 30 (see for example Figure 7) is machine-clad, in the form of press 35, for receiving and transporting liquid from the track 1 also arranged for projecting it through the press nip 34 against the press device 33, which press då lt 35 is then in direct contact with the ellar web 1, so that the above-described press fi lt 35, in this context, also to some extent has a pattern-bearing surface, when the openings and / or recesses provide a certain imprint in the form of an embossed pattern in fi berbanan 1, ie. the web acquires a certain texture, which imprint increases the bulk of the web 1. Instead of a permeable or impenetrable embossing wire 32, an open and a closed wire, respectively, which have a sealing layer facing away from the web 1, can be used.

The drying device 31 comprises a movable heat transfer device 6, 45, 54, which has a heatable surface 7, 51, 59 for transferring heat to the web 1 for drying it to a predetermined dry content, and at least one heating device 38 for heating the movable heat transfer device to desired operating temperature at start-up and then for continuous heating during operation to maintain this operating temperature.

The fibrous web may be arranged to be preheated before the nip 34 by a mandatory heating device of various kinds, not shown. In the embodiment shown in Figure 1, the jacket surface 7 of the support roller 6 constitutes said heatable surface. Further . heating devices 38, which are indicated in Figures 1 and 2 by broken lines, may be arranged along the periphery of the support roller 6 for re-drying the bearing web 1. Each heating device 38 is fixedly or movably arranged, e.g. oscillating, at a predetermined location, or within a predetermined interval, relative to the press nip 34. In the case of more than one heater 38, these are preferably arranged on each side of the press nip 34 against the press 33. The heat transfer is thus arranged to take place at the top at the passage of the berbanan 1 through the press nip 34, but also during the rest of the distance at which the berbanan 1 is arranged to accompany the heat transfer device in a heat transfer, ie. After the hot heating in the press nip 34, during the high pressure pressure applied at the same time, a rapid and intensive evaporation of water external pressure, achieve the desired dry content for the current fi berbanan 1 during transport fi am to the final winding on the winding roller 3. The line pressure in the nip is in the range about 200 - about 800 kN / m, preferably in the range about 300 - about 600 kN / m and the temperature is in the range of about 200 ° C- about 300 ° C, preferably at least at least 150 ° C. At the time of winding on the winding roller 3, the web 1 has reached a desired dry content of up to about 95%. Any suitable coil 38 can be used, although an induction heater is currently preferred. Examples of other heaters 38 are electric and electromagnetic heaters, infrared heaters, laser heaters and gas burners. The heating devices 38 may be arranged inside one or two combustion chambers 39, see Figures 1 and 2, which are arranged along each sector of the support roller 6 and then suitably in front, or in connection with the press nip 34 against the press device 33. In the case shown in Figures 1 and 2 the embodiments are a hood 40 arranged at the top of the support roller 6, which hood 40 encloses a larger part of the periphery of the support roller 6 between said first and second press nips 23, 34. The hood 40, which may be constituted by a ventilation cover, is arranged to enclose one or more several heaters 38 for preventing energy waste and for evacuating the steam emitted during drying.

The machine cladding (s), in the form of embossing wires 32 and presses 35, which are arranged to run downstream up to the press device 33 and further through the press nip 34 are arranged to run in a closed loop over a number of rotatably mounted guide rollers 41, 42, which are arranged upstream of the support roller 6, to turn around the press device 33 and from it run in the rearward direction from the wheelchair 2.

Each pattern-bearing surface, which, relative to the plane of the berban 1, comprises pattern elements 44 in the form of elevations, depressions and / or recesses, which are arranged in a random or predetermined pattern on the side of the pattern-bearing surface facing the berban 1 for generation. of an imprint in the form of an embossed pattern image fi the web 1. Depending on whether one or two pattern-bearing surfaces are arranged to accompany the 1 web 1 through the press nip 34 against the press 33, i.e. if pattern-bearing surfaces are arranged on one of, or on both sides of the ban berbanan 1, the pattern embossing becomes one-sided or double-sided.

Pattern-bearing surfaces can be comprised of one of alternativ your alternative embodiments: for example an embossing wire 32 with pattern elements in the form of woven wire threads forming elevations and depressions in relation to the surface of the web, a process belt 36 with pattern elements in the form of elevations and / or recesses of suitable size, shape and stretching, or a relief-patterned jacket surface 7 (see in particular fi gures 4 and 5), which encloses the support roller 6, the pattern element 44 of which consists of geometric figures with a suitable surface or shape. However, the support roller 6 may also comprise a heatable cylindrical, loose sleeve 45, see for example Figure 5, which encloses the support roller 6 axially, and which sleeve 45 may have a patterned outer surface 7 in the same manner as described for said support roller 6.

The dimensions of the pattern elements, set in a cross section through the support roll, are in a range between about 0.1 to about 2.0 mm for the height of for an individual pattern element, ie. the difference in radius between the upper surface of the pattern elements and the bottom surface of the depressions.

The largest extent for an individual pattern element in any direction along the mantle surface is in a range of about 0.5 to about 5 mm. Compared with a corresponding uncoated fiber web, the part of the surface of the patterned fiber web which, via the press nip against the press device, is in direct contact with the upper surfaces of the pattern elements, amounts to between about 20-5 0%. For a more detailed example of the pattern and pattern elements, see the Swedish patent applications of the same applicant, which were filed with the same date, with the titles “Press” and “Drying section”, respectively.

ALTERNATIVE IVA EMBODIMENTS In the first embodiment of a machine arrangement according to the invention shown in Figure 1 comprising a hot press 50 with heating means 38 and press 30 integrated with a wheelchair 2, which wheelchair 2 especially comprises a side roller 6 with a smooth outer surface 7, the press 30 consists of a roller press and the press 33 of a cylindrical, smooth press roll to form a conventional press nip 34. Through the pattern-heated, nip-shaped web, press-nip 34 is heated by said heating device 38, the nip 35, an embossing wire 32 and the n-wire 1 are arranged to run together under the device. cylindrical roller 33 for the press belt 35 and against the hot support roll 6 for the web 1, with the embossing wire 32 arranged between the press belt 35 and the web 1 for one-sided embossing of the web 1. The smooth surface of the carrier roll 6 can be scraped, the web 1 follows the smoothest surface after the press nip 34, i.e. the smooth casing surface 7 of the support roller 6, which constitutes two favorable advantages of the embodiment shown in Figure 1, free from web transfer problems.

In the second embodiment of the machine arrangement according to the invention shown in Figure 2, the press 30 instead consists of a shoe press with an extended press nip 34 and the press 33 of a shoe press roll, which comprises a pressure shoe 46 and an impermeable flexible sheath 47 and the support roll 6 is axially enclosed by a loose sleeve 45 with smooth jacket surface 5 l. The jacket 47 is fixedly mounted at rotatable peripheral end portions 48 of the shoe press roller 33. The pressure shoe 46 has a concave surface 49, over which the jacket 47, the press 35, the embossing wire 32 and the web 1 are arranged to run together below sliding contact against the pressure shoe 46 for the jacket 47, during abutment against the support roller 6, which has a smooth jacket surface 7, for the web 1 and with the press belt 35 and the embossing wire 32 between the jacket 47 and the web 1 for one-sided embossing of the web 1. The concave surface 49 is in pressure-generating cooperation with the support roller 6 by means of actuators (shown by a schematic arrow) to form the extended press nip 34. Fiberb otherwise, the strip 35 and the embossing wire 32 are separated after the outlet from the press nip 34 to instead abut against and accompany the sleeve 45 around a predetermined part of its jacket surface 51.

In the detailed view of the machine arrangement according to Figure 2 shown in Figure 3, it is clear that the heatable sleeve 45 is arranged loose in relation to the support roller 6, which sleeve 45 is replaceable, oven-stable, and heatable from its outside 51 and which sleeve 45 is arranged. except in the press nip 34, enclosing with radially a play 52 at least the entire axial part of the support roller 6 acting for the press nip 34 and arranged so that it can expand relative to the support roller 6 during said heating before the press nip 34 without adverse stresses thereby arising in the sleeve. 45. The sleeve 45 has a circular cross-section with an inside 53, which is arranged to be brought into contact with the support roller 6 within the zone of the press nip 34. to the winding roller 3 for winding thereon. During operation, the support roller 6 is arranged to press the sleeve 45 against the press member 33 to form a sufficiently large frictional force between the support roller 6 and the sleeve 45 so that the sleeve 45 is driven nm by the driven support roller 6 at the same speed as this in the press nip 34. During operation the sleeve 45 is arranged to rotate about its own axis of rotation, which is eccentrically located in relation to the axis of rotation of the support roller 6. Furthermore, in the machine arrangement according to the embodiment shown in Fig. 3, an 35 lt 35, an embossing wire 32, which transports a fi berban 1 through the heated, fi berban 1 10 15 20 25 30 35 pattern embossing press nip 34, and a winding roller 3 on which a material roll 4 is during rolling up against the casing surface 51. of the sleeve 45. In said embodiment the press device 33 consists of a shoe press roll, but can instead consist of a press roll (see Figure 1), which also applies to other possible embodiments of the invention. The line load, ie. the nip pressure in the downstream first press nip 23, between the sleeve surface 51 of the sleeve 45 and the winding roller 3 with the material roll 4 on it being wound up, is so much lower than the nip pressure in the upstream press nip 34 between the press 33 and the sleeve 45 on the substantially opposite side of the sleeve 45 that said frictional force for driving the sleeve 45 is fi in from a negative influence thereof.

In general, it applies to the invention that the control of the nip pressure, for the material roll 4 growing on the winding roller 3 in the first press nip 23 located downstream of the support roller 6, is arranged to be performed by an interaction between the primary system actuators 9 during the initial winding. the growing material roll 4 is controlled by the actuators of the secondary system 10 in cooperation. The pressing arm 20, 29 of the respective systems 9, 10 are then arranged to press against the ends of the winding roller 3 in order to maintain a desired and adjustable nip pressure during the entire growth of the material roll 4.

The winding roller 3 is driven, for example, by the above-mentioned separate center driver belonging to the primary system 9 during the initial acceleration of the winding roller 3 and thereafter while maintaining the same peripheral speed of the material roll 4 being wound as the current peripheral speed of the support roller 6. the line pressure pressure opposite the second nip 34 caused by the abutment of the winding roller 3 against the sleeve 45 is kept within a predetermined permissible value for maintaining the correct line pressure, and thus also the friction desired for driving the sleeve 45 between said sleeve 45 and the press member 33 has the sleeve 45. a sufficient wall thickness to withstand the stresses that arise in the sleeve 45 in, and due to, the two press nips 23, 34, so that the sleeve 45 maintains both its straightness across the machine and its radius around it, i.e. the wall thickness of the sleeve 45 is chosen so that the sleeve 45 is free from roundness and axial deformations.

In the third embodiment of the invention shown in Figure 4, the machine arrangement comprises a shoe press roller 33, over which a blanket 35 for receiving and transporting water which relief pattern constitutes a second movable pattern carrier for forming a double-sided embossing pattern, heated press nip 34 and a winding roller 3 on which a roll of material 4 is wound against the patterned outer surface 7 of the support roller 6.

The fourth embodiment of the invention shown in Figure 5 differs from that shown in Figure 4, in that it specifically comprises a loose, relief-patterned, heated sleeve 45, which relief pattern constitutes a second pattern carrier for forming a double-sided embossing press nip 34.

The embodiments of the invention shown in Figs. 6 and 7 differ from the embodiments shown in Figs. the carrier roll 6, respectively between the press device 33 and the sleeve 45, for a one-sided embossing of the carrier web 1.

In the embodiments of the invention shown in Figs. and one or more turning rollers 58, the support roll 6 and the sleeve 45, respectively, having a smooth jacket surface 7. The embodiments of the invention shown in Figs. for either a one-sided or double-sided pattern embossing of the carrier web 1, and the presence of a sleeve 45 around the carrier roller 6.

Figs. 9, 10 comprise embossing wire 32 and can provide one-sided embossing in case the strip has a smooth surface, or double-sided in case the strip 54 is patterned. If the belt 54 is impermeable, the nozzle 56 arranged inside the belt loop is arranged at the gears 8 - 11 instead of said belt loop.

In close connection to and downstream of the outlet from the said first press nip 23 towards the growing material roll 4, for the embodiments comprising support roll 6, see in Fig. 1, at a support roll 6 enclosed by sleeve 45, see figure 2, and in the embodiment comprising a pattern carrier in In the form of an endless belt 54 against which the winding of the web 1 is arranged to be carried out supported by a portion of the belt 54, see figure 8, a blowing device 55 is arranged, which comprises one or two nozzles 56 for compressed air, so-called air knives, for strong air blowing against the web 1 to facilitate the detachment of the web 1 from the actual substrate, which as described above may consist of the jacket surface 7 of the support roller 6, the embossing wire 32 or the sleeve 45, and for cleaning the same. In the embodiment with permeable belt, see Figures 8-11, in the embodiment with impermeable belt, which is not shown, instead the blowing device 55 and a possible removal scraper arranged on the outside of the belt loop 54. At temperatures on the substrate from 250 ° C and upwards, however, it is known the track 1 easily releases from the ground. This is considered to be due to the high dry content of the thus non-adhesive web web 1 obtained by hot pressing and the vapor pressure which arises on the side of the web web 1 facing the carrier roll 6. If desired, the air jet can be constituted by or co-operate with the hot the gases from a gas burner, or the like. All fibres stuck to the substrate will be immediately burned to ash and carried away by the gas jet. The heating of the substrate by means of the hot gases also reduces the need for additional heating devices for the heating of the overpass.

Brushes, not shown, for example, can also be used for the said cleaning.

With the invention described above, a machine arrangement is obtained comprising a combination of a wheelchair 2 and a hot press 50 for producing a continuous web with a high bulk of cellulosic carrier material for filling a patterned paper web 1 directly against a drying cylinder, which also forms the mill 2. carrier roll 6, without the web 1 being creped from the drying cylinder 6. The web 1 runs free of open drafts during winding and a very compact design of the paper machine is achieved, in which the need for a Yankee cylinder is removed. The resulting product constitutes an uncreped paper web 1 having the above-mentioned, particularly favorable properties.

All the above-mentioned actuators can, for example, consist of hydraulic or pneumatic cylinders. Finally, in order to ensure the transfer of the berban 1 to the winding roller 3, a gluing device 57 for applying an adhesive to either the berban 1 or the winding roller 3 is provided with the pre-nip 23 against the winding roller 3. *

Claims (20)

10 15 20 25 18 PATENT REQUIREMENTS A method of a machine arrangement in a machine for manufacturing a patterned continuous web (1) of cellulosic material, preferably a tissue web, wherein a damp web (1) is advanced by means of a press nip (34) together with at least one endless machine cladding (32, 35), which, or at least one of which, is capable of receiving and transporting water from the ban berbanan (1), and the press nip (34) being a fi berbanan (1) pattern embossing press nip (34) and the moist The ellipse web (1) has a sufficiently low dry content to allow re-storage of fi fibers in the web (1) during the passage through the press nip (34), so that the fi web (1) obtains a structure with areas of different density, after which the machine cladding or claddings (32, 35 ) Lead away from the fi berbanan (1) after the press nip (34), the fi berbanan (1) is dried with at least a substantially retained structure, and the dried, patterned ñberbanan (1) is rolled up in a wheelchair (2), characterized by pressing and dries the web (1) in a hot press (50), which has at least one heat transfer device (6, 45, 54) with a heatable surface (7, 51, 59), which is heated by a heating device (38), and which surface (7, 51, 59) abuts the fiber web (1), which heatable surface (7, 51, 59) runs through the press nip (34) together with at least one machine cladding (32, 35) which advances the ber web (1) so that the fi berbanan (1) is enclosed between the machine cover (32, 35) and the heatable surface (7, 51, 59) and which hot press (50) is integrated with the wheelchair (z). Method according to claim 1, characterized in that a hot press (50) is used with two rollers (6, 33) which form the press nip (34) between them, at least one of the rollers (6, 33) comprising a pattern-bearing surface (7). , 51) or surrounded by at least one machine cladding (32, 35) comprising a pattern bearing surface. Method according to Claim 1 or 2, characterized in that the winding up of the fiber web (1) is carried out directly against this heatable surface (7, 51, 59). Method according to Claim 2, characterized in that at least one of the rollers (6, 33) constitutes a shoe press roller with a pressure shoe (46). 10 15 20 25 | r | i. . '_ I "" - - f t: <. f a 2 ~ r. f <f, r 'in (fn (Uf oo> * - - <c (e x <._ r, sf r l r r av.,. c l rf. i «r t r <z' <: w vc u nu. .- Method according to claims 1, 2 or 3, characterized in that the roller (6) with the heatable surface (7) constitutes a support roller (6) in a support roller wheelchair (2). Method according to Claims 1, 2 or 3, characterized in that the heatable surface (59) forms a support for the roll of material (4) during winding. Method according to claims 1 or 2, characterized in that the roller (6) comprises a heatable solid roller body. A method according to claims 1 or 2, characterized in that the roller (6) comprises a heatable loose sleeve (45) sleeve which with radial play (52), except in the press nip (34), surrounds a cylindrical roller body in said one roller . (Method according to claim 8, characterized in that the winding of the web (1) is performed against the loose sleeve (45). Method according to one of the preceding claims, characterized in that at least one of the heatable surfaces (7, 51, 59) and the surfaces of machine cladding (32, 35) comprise a predetermined pattern. Machine arrangement in a machine for manufacturing a patterned continuous web (1) of cellulosic-containing carrier material, preferably a tissue web, comprising at least one endless machine cladding (3 2, 35) which, or of which at least one, is capable of from a moist fiber web (1) receiving and transporting water, a press (30) with pattern embossing press nip (34) through which the machine cladding (35) or machine cladding (32, 35) are arranged to run together with the moist web (1) for pressing the ñber web (1), which has a dry content low enough to allow re-storage of fibers in the web (1), so that fi the web (1) obtains a structure with areas of different density on the passage through the press nip (34), don (42) ) for discharging at least immediately after the nip (34) at least the machine cover (3 5) for receiving and transporting the water from the fi berbanan (1), a drying device (31) for drying the fi berbanan (1) with at least substantially retained structure, and a wheelchair (2) for winding up the dried, patterned web (1) while forming a roll of material (4), characterized in that the press (30) and the drying device (31) are integrated with each other to form of a hot press (50) having at least one heat transfer device (6, 45, 54) having a heatable surface (7, 51, 59) arranged to be heated by a heating device (38) and which surface (7, 51, 59) is arranged to abut against the fi berbanan (1) and pass through the press nip (34) together with at least one machine liner (32, 35) which is arranged to carry fi the berban (1) and enclose the fi berban (1) between the machine lining (32, 35) and the heatable surface (7, 51, 59) and which hot press (50) is integrated with the wheelchair (2) to form said machine arrangement. Machine arrangement according to claim 11, characterized in that the hot press (50) comprises two rollers (6, 33) which form a press nip (34) between them, at least one of the rollers (6, 33) comprising a pattern-bearing surface (7, 51). ) or surrounded by one of the machine cladding (3 2, 35) with pattern-bearing surfaces. Machine arrangement according to Claim 11 or 12, characterized in that the winding of the web (1) is arranged to be carried out directly against this heatable surface (7, 51, 59) of the drying device (31). Machine arrangement according to claim 12, characterized in that at least one of the rollers (6, 33) is a shoe press roller and comprises a shoe (46). Machine arrangement according to one of Claims 11 to 13, characterized in that the roller (6) with the heatable surface (7) forms a base roller (6) in a support roller wheelchair (2). Machine arrangement according to one of Claims 11 to 13, characterized in that the heatable surface (59) is arranged to form a support for the roll of material (4) during winding. Machine arrangement according to claims 11 or 12, characterized in that the roller (6) comprises a heatable solid roller body. 'Ä.' I _ i i. 11-. . # 4. <r. _§ ((<1: (ft (4 -. - <-1 _.. <<(_, <21 “v Hi f, 1 i. <É I j '' r <iziii \ ^ ~ i: cr Machine arrangement according to claims 11 or 12, characterized in that the roller (6) comprises a heatable loose roller (45), which with radial play, except in pressinipity, surrounds a cylindrical roller body in said one roller. Machine arrangement according to Claim 18, characterized in that the winding of the web is carried out against the surface (51) of the loose sleeve (45). Machine arrangement according to one of Claims 11 to 19, characterized in that at least one of the heatable surfaces (7, 51, 59) and / or the surfaces of machine cladding (3 2, 35) is patterned.