MÁQUINA E MÉTODO PARA PRODUZIR UMA MANTA FIBROSA

Abstract

The invention relates to a machine for producing a fibrous web (1), comprising a Yankee cylinder (2) and a clothing run (4) with a press roll (5), a piecing means (6) and internal guide means (7), and is characterised in that at least one internal cantilever (8) is arranged within the clothing run (4), and the press roll (5) and all the internal guide means (7) are connected to the internal cantilever (8), wherein the piecing means (6) is connected to the internal cantilever (8) and to the press roll (5). The invention also relates to a method and allows efficient changing of the clothing (3).

Description

1 / 13 “MACHINE AND METHOD FOR PRODUCING A FIBROUS MAT”

[0001] The present invention relates to a machine for producing a fibrous mat, comprising a Yankee cylinder for drying and / or smoothing the fibrous mat and a mat conveyor designed to circulate an endless mat, wherein the mat conveyor comprises a press roll, a positioning means and an internal guide means for guiding the endless mat, the press roll can be placed or pressed against the Yankee cylinder with the positioning means to form a line of contact, the endless mat can be guided through the nip between the Yankee cylinder and the press roll, and the internal guide means are disposed within the mat conveyor in contact with an inner side of the endless mat. The invention also relates to a method for changing the endless liner of the mat conveyor of the machine according to the invention.

[0002] Machine glazed paper (MG paper) is produced on a machine with a Yankee cylinder. The Yankee cylinder typically has a diameter of about 2.5 meters to about 8.5 meters and is made of cast iron or steel.

[0003] For example, document US2784652A describes a paper machine for the production of MG paper, comprising a Yankee cylinder, a first web conveyor with a first suction press roll forming a first nip with the Yankee cylinder to transfer a fibrous web from a first felt to the Yankee cylinder, a second web conveyor with a second suction press roll forming a second nip with the Yankee cylinder to dewater the fibrous web that passes through the second nip with a second felt.

[0004] Typically, the machine comprises a structure for holding the various machine elements, so that the way the blanket can be pulled into the machine or the blanket conveyor Petition 870250085454, dated 09 / 22 / 2025, page 6 / 35 2 / 13 largely depends on the structure. For example, it may be necessary to sew the blanket into endless blankets on the machine first in order to form endless blankets. The use of cantilever beams is also known, where cantilever beams are mounted or fixed on one side of the drive side of the machine, opposite the operator side. This allows the cantilever beams to absorb loads across the entire width of the machine.

[0005] When the machine is in operation, the cantilever beams are additionally connected, or locked, to the operator-side structure by means of intermediate elements, resulting in a much greater load capacity. To pull an endless blanket, the operator-side connections between the cantilever beams and the operator-side structures are opened or the intermediate elements are removed so that the endless blanket can be inserted into the resulting openings, through which the guide means for guiding the blanket, i.e., guide rollers, tension rollers and regulating rollers, must also be transferred to their own blanket change positions.

[0006] The objective of the invention is a machine with an optimized conveyor belt that allows for efficient belt replacement. Belt replacements may be necessary for various reasons, for example, planned to renew the belt or replace it with an alternative, or unplanned after an unforeseen belt failure. Belt replacement means that the entire machine stops, resulting in a deterioration in the machine's efficiency or operating time and, consequently, in costs due to lost production. Optimizing belt replacement, therefore, directly improves machine availability and economic efficiency.

[0007] According to the invention, this is achieved by the fact that one or more internal cantilever beams are arranged within the blanket conveyor, the press roller and the internal guide means are Petition 870250085454, dated 09 / 22 / 2025, page 7 / 35 3 / 13 connected to one or at least one of the internal cantilever beams arranged within the blanket conveyor, wherein the internal cantilever beam(s) is / are designed to receive or support the press roll and all internal guide means of the blanket conveyor, and wherein the positioning means are connected, on one side, to one or at least one of the internal cantilever beams, directly or indirectly, by means of internal connecting means, and, on the other side, to the press roll. A blanket conveyor is delimited by the endless circulating blanket and comprises guide means for guiding the blanket, namely, guide rolls, tension rolls, regulating rolls, by means of which these are in contact with an inner side of the blanket as internal guide means or in contact with an outer side of the blanket as external guide means.According to the invention, the conveyor belt comprises one or more internal cantilever beams arranged within the conveyor belt, wherein the pressure roller and all internal guide means are connected to the internal cantilever beams. This means that the pressure roller and all internal guide means of the conveyor belt are caught or supported by the internal cantilever beams. The pressure roller, which forms a pressure nip with the Yankee cylinder, is therefore a specific embodiment of an internal guide means and is also connected to, or supported by, one or more internal cantilever beams. Furthermore, according to the invention, the positioning means is connected, on one side, to one or at least one internal cantilever beam, directly or indirectly, by means of internal connecting means and, on the other side, to the pressure roller. The internal connecting means are designed as beams, for example.Advantageously, the positioning means is essentially disposed within the conveyor belt. The invention allows for surprisingly efficient belt changes. By opening the operator-side connections between the cantilever beams and the operator-side frame, or by removing the intermediate elements, a single piece is needed. Petition 870250085454, dated 09 / 22 / 2025, page 8 / 35 4 / 13 of the blanket can be pulled in and out of the machine. According to the invention, there is no need to move or transfer the guide means to their own blanket change positions, as required in the prior art, so that the largest guide means in the blanket sequence – the press roll – does not require any additional manipulation to perform the blanket change and, in particular, separation of the positioning means from the press roll, the internal cantilever beam or the internal connecting means is not necessary.

[0008] Advantageously, the press roll and internal guide means are connected directly or indirectly to one or at least one of the internal cantilever beams. An indirect connection can be provided by means of the internal connecting means arranged essentially within the blanket sequence, so that the internal connecting means are supported exclusively by one or more internal cantilever beams. By means of a direct connection, the press roll and internal connecting means can be connected directly to the cantilever beam. By means of an indirect connection, i.e., by means of internal connecting means, internal guide means or the press roll that are furthest from the cantilever beam can also be connected to it, the internal connecting means being designed as beams, for example.Similarly, the positioning means is connected directly to one or at least one of the internal cantilever beams or indirectly, i.e., to the internal connecting means. In this way, an ideal integration can be achieved depending on the number and load capacity of the available internal cantilever beams and the number of internal guiding means to be connected.

[0009] Especially advantageous is a machine in which the machine comprises exactly an internal cantilever beam in the blanket conveyor. In this case, the pressing roller and all the means of Petition 870250085454, dated 09 / 22 / 2025, page 9 / 35 5 / 13 internal guides are supported by the internal cantilever beam, directly or indirectly, by means of internal connection means. This allows for a particularly compact blanket design and particularly efficient blanket changes, since the connections to the structure on the guide side only need to be opened or closed for a single cantilever beam.

[0010] Equally advantageous is a machine in which the pressing roll is, in particular, a pressing roll with deflection compensation and forms a marking nip, the endless web is a marking web, in particular a marking felt, and the marking web can be guided by the marking nip between the Yankee cylinder and the pressing roll. By designing the web conveyor with a marking nip, patterns, for example, lines, can be applied to the fibrous web guided through the marking nip through the marking web.Typically, the machine comprises a first pass of the web according to the invention with a first pressing roll, in particular a deflection-compensating pressing roll, and a second web conveyor, according to the invention, with a second press roll to form a marking nip, wherein a first marking nip of the first web conveyor, formed between the Yankee cylinder and the first press roll, is disposed ahead of a second marking nip of the second web conveyor, formed as a marking nip between the Yankee cylinder and the second press roll, when viewed in the direction of movement of the fibrous web. The first web conveyor, or the first nip, allows the fibrous web to be positioned, pressed or dehydrated against the Yankee cylinder. Between the first nip and the second nip, the fibrous web is thermally dried in the Yankee cylinder, so that the fibrous web has a suitable dry content in the second nip for marking the fibrous web.Advantageously, the press roller of a blanket conveyor is designed as one. Petition 870250085454, dated 09 / 22 / 2025, page 10 / 35 6 / 13 roller with deflection compensation. As is well known, Yankee cylinders are operated in a pressure range, for example, between 2 and 10 bar(g), the Yankee cylinder itself being a thin-walled machine element. The deformations of the Yankee cylinder, which depend on the operating mode – such as overpressure, centrifugal forces, thermal stresses and contact pressure – can be optimally compensated by a roller with deflection compensation, meaning that uniform contact pressure and reliable production of the fibrous mat can be achieved in the respective nip.

[0011] A favorable embodiment of the invention is characterized by the fact that the press roller (5) can be applied against the Yankee cylinder (2) during operation with a maximum linear load of 200 kN / m, preferably a maximum of 120 kN / m. Advantageously, such linear loads can still be well absorbed by a structure with an internal cantilever beam.

[0012] Another advantageous embodiment of the invention is characterized by the fact that the blanket conveyor comprises external guide means, which are arranged outside the blanket conveyor in contact with an external side of the endless blanket. The external guide means are connected to a machine structure, but not to the internal cantilever beam of the blanket conveyor. In this case, the external part of the endless blanket on the nip is in direct contact with the fibrous blanket. Advantageously, a greater blanket tension path can be achieved on a blanket conveyor with external guide means.

[0013] An advantageous machine is one in which the conveyor belt comprises at least one guide means designed as a tension roller and all guide means arranged outside the conveyor belt are designed as a tension roller. Alternatively, and equally advantageous, is a machine in which the conveyor belt does not comprise a guide means, i.e., guide rollers, tension rollers, regulating rollers, which Petition 870250085454, dated 09 / 22 / 2025, p. 11 / 35 7 / 13 is disposed outside the blanket conveyor in contact with an outer side of the endless blanket, wherein the blanket conveyor comprises at least one guide means designed as a tension roller and the tension roller is disposed within the blanket conveyor. It has been recognized that a tension roller can be moved automatically between end positions. Advantageously, the tension roller only needs to be moved in the direction or to the corresponding end position to change the blanket, i.e., in the direction in which the blanket is released. This allows for efficient blanket change without additional manipulation of the tension roller or without requiring the tension roller to be moved to a separate change position. Advantageously, a tension roller is configured as a lever tension roller or linear tension roller.

[0014] The object of the invention is also a method for altering the infinite cover of the machine's conveyor belt according to the invention. The method comprises the following steps: - Connecting the blanket on the operator side of the blanket to an extraction device. - Connection of the blanket on the drive side of the blanket by means of at least one gripping element to a retraction device, which is arranged, in particular, on the drive side. - Removal of the blanket and at least one filling element to the operator's side of the machine and out of the machine via the extraction device. - Separation of the blanket from at least one filling element - Connection of a new blanket to the drive side of the new blanket by means of at least one gripping element to the retraction device. - Retraction of the new blanket towards the drive side and into the machine by means of at least one gripping element. Petition 870250085454, dated 09 / 22 / 2025, page 12 / 35 8 / 13 connected to the retraction device.

[0015] Here, the drive side refers to the side of the machine on which the machine drives are primarily arranged, with the operator side and the drive side forming opposite sides of the machine. The operator side is named in honour of the machine's good accessibility to the machine for the machine operator. The method according to the invention allows for a particularly efficient blanket change. Thus, the gripping elements connected to the retraction device on the drive side are moved to pull the new blanket from the drive side to the operator side as the blanket is pulled out. There is no need to laboriously move the gripping elements manually around the machine and, in particular, there is no need for the machine operators to pass by the machine.It is particularly advantageous that the method according to the invention allows the used blanket to be removed from the machine without destroying it, thus allowing the blanket to be reused later. Advantageously, the removal of the blanket or the installation of the new blanket is carried out manually and / or motorized, with the gripping elements preferably designed as clamps and the retraction device preferably designed as a winch.

[0016] The invention will now be described using the examples in the drawings.

[0017] Figure 1 shows a machine according to the invention with a tension roller arranged within a sequence of blankets.

[0018] Figure 2 shows a machine according to the invention with a tension roller arranged outside a sequence of blankets.

[0019] Figure 3 shows a machine according to the invention with a linear tensor arranged within a sequence of blankets.

[0020] Figure 4 illustrates the method according to the invention for Petition 870250085454, dated 09 / 22 / 2025, page 13 / 35 9 / 13 endless blanket replacement.

[0021] Figure 1 shows a machine according to the invention for producing a fibrous mat 1 with a Yankee cylinder 2, a first mat conveyor 4,15 and a second mat conveyor 4,16. The conveyor belt 4, 15 and 16 is designed to circulate an endless blanket 3 and comprises a pressure roller 5 to form a nip 9 against the Yankee cylinder 2, a positioning means 6 to position / press the pressure roller 5 against the Yankee cylinder 2 and an internal guide means 7 to guide the endless blanket 3. The endless blanket 3 of the respective conveyor belt 4, 15 and 16 is guided between the Yankee cylinder 2 and the pressure roller 5 through the nip 9. By definition, the internal guide means 7 are disposed within the conveyor belt 4, 15 and 16, i.e., within the circulating blanket 3, and are in contact with an inner side of the endless blanket 3.Consequently, the external guide means 17 are disposed outside the blanket conveyor 4, 15 and 16, i.e., outside the circulating blanket 3, and are in contact with an external side of the endless blanket 3. According to the invention, an internal cantilever beam 8 is disposed within the blanket conveyor 4, where the pressure roller 5 and the internal guide means 7 are connected to the internal cantilever beam 8, directly or indirectly, by means of internal connecting means 11. The internal cantilever beam 8 is designed to accommodate or support the pressure roller 5 and all the internal guide means 7, i.e., guide rollers, tension rollers or leveling rollers, of the blanket conveyor 4. The positioning means 6 connect the pressure roller 5 to the internal connecting means 11 or to the internal cantilever beam 8, so that the internal connecting means 11, as well as the positioning means 6, are essentially disposed within the blanket conveyor 4.Positioning devices 6 are designed, for example, as a hydraulic or pneumatic pressure cylinder or as a press bellows.

[0022] In Figure 1, the first blanket mat 15 is shown as Petition 870250085454, dated 09 / 22 / 2025, page 14 / 35 10 / 13 a blanket conveyor according to the invention with a press roll 5 to form a first nip 9, and the second blanket conveyor 16 is shown as an additional blanket conveyor according to the invention with a second press roll 5, preferably with deflection compensation, wherein a marking blanket 14 is guided through the second nip 9, designed as a marking nip 13, between the Yankee cylinder 2 and the second press roll 5 and the first nip 9 is disposed in front of the second nip 9 of the second blanket conveyor 16, viewed in a direction of running of the fibrous blanket 1. In the second blanket conveyor, no guiding means 17 is disposed outside the blanket conveyor 4, 16 or in contact with an outer side of the endless blanket 3, wherein the blanket conveyor 4, 16 comprises a tension roll 18 which is disposed inside the blanket conveyor 4, 16.The tension roller 18 of the second conveyor belt 4,16 is designed as a lever tension roller, but it can also be designed as a linear tension roller. Figure 1 also shows the two end positions of the tension roller 18 of the second conveyor belt 16. In the first upper end position (in Figure 1), the tension roller 18 exerts maximum tension on the endless belt 3. In the second lower end position (in Figure 1), the tension roller 18 does not cause any tension on the endless belt 3 and is selected so that this end position is ideal for changing the endless belt 3.

[0023] In this case, the internal oscillating beams 8 are mounted or fixed on one side of the drive side of the machine, opposite the operator side, and can absorb loads across the entire width of the machine.During machine operation, the internal oscillating beams 8 or internal oscillating beams are connected, or locked, to the structure on the guide side by means of intermediate elements 24, resulting in a much greater load capacity. To pull the endless blanket 3, the intermediate elements 24 on the operator side, between the internal oscillating beams 8 and the structure on the guide side, are opened or. Petition 870250085454, dated 09 / 22 / 2025, page 15 / 35 11 / 13 removed, so that the endless blanket 3 can be inserted into the openings thus formed.

[0024] Figure 2 shows a machine according to the invention for producing a fibrous mat 1 with a Yankee cylinder 2, a first mat conveyor 4, 15 and a second mat conveyor 4, 16. In contrast to Figure 1, the second mat conveyor 16 has an external guide means 17, which is in contact with the outer part of the endless mat 3, outside the second mat conveyor 16. The external guide means 17 is designed as a tension roller 18, while in the second mat conveyor 16 shown, all external guide means 17 are designed as tension rollers 18. The tension roller 18 is designed as a lever tensioner and is connected to the machine frame outside the mat conveyor 16, but not to the internal oscillating beam 8. Alternatively, the tension roller can also be designed as a linear tension roller. Figure 2 also shows the two end positions of the tension roller 18 of the second belt 16.In the first lower end position (Figure 2), the tension roller 18 applies maximum tension to the endless blanket 3. In the second upper end position (Figure 2), the tension roller 18 does not cause any tension on the endless blanket 3, thus allowing the blanket to be easily pulled inwards, making this end position ideal for changing the endless blanket 3.

[0025] Figure 3 shows a machine, according to the invention, for the production of a fibrous mat 1 with a Yankee cylinder 2, a first mat conveyor 4, 15 and a second mat conveyor 4, 16. In contrast to Figure 1, the second mat conveyor 16 has a tension roller 18 designed as a linear tensioner. Figure 3 also shows the two end positions of the linear tensioner of the second mat conveyor 16. In the first upper end position (Figure 3), the linear tensioner causes maximum tension of the endless mat 3. In the second lower end position (Figure 3), the linear tensioner does not cause any tension. Petition 870250085454, dated 09 / 22 / 2025, page 16 / 35 12 / 13 tension on the endless coil 3, making this final position ideal for changing the endless coil 3.

[0026] Figure 4 illustrates the method of changing the endless blanket 3 of the blanket conveyor of the machine according to the invention. The upper illustration in Figure 4 shows the endless blanket 3 still disposed in the machine. In this case, the blanket 3 is connected to an extraction device 20 on the operator side 19 of the blanket 3 and, by means of gripping elements 22 on the drive side 21 of the blanket 3, to a retraction device 23 disposed, in particular, on the drive side 21 of the machine. According to the method, the extraction device 20 allows the blanket 3 to be pulled to the operator side 19 and out of the machine, so that the gripping elements 22 are also moved to the operator side 19 and out of the machine when the blanket 3 is pulled out of the machine. The blanket 3 is separated from the gripping elements 22 of the retraction device 23.In the lower illustration of Figure 4, the new blanket 3 – not yet retracted into the machine – is shown connected to the retraction device 23 on the drive side 21 of the new blanket 3 by means of the gripping elements 22. In the next step, the new blanket 3 is advantageously pulled into the drive side 21 and into the machine by means of the gripping elements 22 connected to the retraction device 23. Thus, the removal or installation of the blanket 3 is carried out manually and / or motorized, with the gripping elements 22 preferably designed as clamps and the retraction device preferably designed as a winch.

[0027] The present invention offers numerous advantages and allows the configuration of an efficient belt conveyor, which enables efficient belt replacement. Short belt replacement times improve the overall efficiency of the entire machine, increase productivity, and improve cost-effectiveness. The invention allows, in particular, that the Petition 870250085454, dated 09 / 22 / 2025, page 17 / 35 13 / 13 blanket can be changed quickly and without damage, which is advantageous if the blanket, particularly the marking blanket, is changed frequently. Reference Numbers: fibrous blanket, Yankee cylinder, blanket conveyor, press roller, positioning means, internal guide means, internal cantilever beam, internal nip, internal connection means, marking nip, blanket marking, first blanket conveyor, second blanket conveyor, external guide means, tension roller, operator side, extraction device, drive side, gripping element, retraction device, intermediate elements. Petition 870250085454, dated 09 / 22 / 2025, p. 18 / 35

Claims

1 / 4 CLAIMS 1. Machine for producing a fibrous mat (1), comprising a Yankee cylinder (2) for drying and / or smoothing the fibrous mat (1) and a mat conveyor (4) designed to circulate an endless mat (3), wherein the mat conveyor (4) comprises a press roll (5), a positioning means (6) and internal guide means (7) for guiding the endless mat (3), the press roll (5) can be placed or pressed against the Yankee cylinder (2) with the positioning means (6) to form a nip (9), the endless mat (3) can be guided through the nip (9) between the Yankee cylinder (2) and the press roll (5), and the internal guide means (7) are disposed within the mat conveyor (4) in contact with an inner side of the endless mat (3), characterized in that one or more internal cantilever beams (8) are disposed within the mat conveyor (4),The press roll (5) and the internal guide means (7) are connected to one or at least one internal cantilever beam(s) (8) disposed within the blanket conveyor (4), wherein the internal cantilever beam(s) (8) is / are designed to receive or support the pressure roll (5) and all the internal guide means (7) of the blanket conveyor (4), and wherein the positioning means (6) is connected, on one side, to one or at least one of the internal cantilever beam(s) (8) directly or indirectly by means of an internal connecting means (11) and, on the other side, to the pressure roll (5).

2. Machine according to claim 1, characterized in that the positioning means (6) is disposed substantially within the blanket conveyor (4).

3. Machine, according to any one of claims 1 or 2, characterized in that the pressure roller (5) and the internal guide means (7) are connected directly or indirectly to one or at least one of the internal cantilever beams (8) by means of an internal connection means (11) disposed substantially within the mat (4).

4. Machine, according to any of the preceding claims, characterized in that the internal connecting means (11) are supported exclusively by one or more internal cantilever beams (8).

5. Machine, according to any of the preceding claims, characterized in that the machine comprises exactly an internal cantilever beam (8) in the blanket track (4).

6. Machine, according to any of the preceding claims, characterized in that the pressure roller (5) is, in particular, a pressure roller with deflection compensation (5) and forms a marking nip (13), the endless blanket (3) is a marking blanket (14), in particular a marking felt, and the marking blanket (14) can be guided by the marking nip (13) between the Yankee cylinder (2) and the pressure roller (5).

7. Machine, according to any of the preceding claims, characterized in that the machine has a first blanket conveyor (15) with a first pressing roll (5), in particular a deflection-compensating pressing roll, and a second blanket conveyor (16) with a second pressing roll (5) to form a marking nip (13), wherein a first nip (9) of the first blanket conveyor (15), formed between the Yankee cylinder (2) and the first pressing roll (5), is disposed in front of a second nip (9) of the second blanket conveyor (16), formed as a marking nip (13) between the Yankee cylinder (2) and the second pressing roll (5), when viewed in the direction of movement of the fibrous blanket (1).

8. Machine, according to any of the preceding claims, characterized in that the pressing roller (5) can be applied against the Yankee cylinder (2) during operation with a maximum line load of 200 kN / m, preferably a maximum of Petition 870250085454, dated 22 / 09 / 2025, page 20 / 35 3 / 4 120 kN / m.

9. Machine, according to any of the preceding claims, characterized in that the blanket conveyor (4) comprises external guide means (17), which are disposed outside the blanket conveyor (4) in contact with an external side of the endless blanket (3).

10. Machine, according to any of the preceding claims, characterized in that the blanket conveyor (4) comprises at least one guide means (17) designed as a tension roller (18) and all guide means (17) arranged outside the blanket conveyor (4) are designed as a tension roller (18).

11. Machine, according to any one of claims 1 to 8, characterized in that the blanket conveyor (4) does not comprise a guide means (17) disposed outside the blanket conveyor (4) in contact with an outer side of the endless blanket (3), wherein the blanket conveyor (4) comprises at least one guide means (17) designed as a tension roller (18) and the at least one tension roller (18) is disposed inside the blanket conveyor (4).

12. Machine according to any one of claims 10 or 11, characterized in that the tension roller (18) is designed as a lever tension roller or linear tension roller.

13. Method for changing the endless belt (3) of the belt conveyor (4) of the machine, according to any one of claims 1 to 12, characterized in that it comprises the steps: - Connecting the belt (3) on the operator side (19) of the belt (3) to an extraction device (20) - Connecting the belt (3) on the drive side (21) of the belt (3) by means of at least one gripping element (22) to a retraction device (23), which is arranged, in particular, on the drive side (21). - Removing the belt (3) and at least one element. Petition 870250085454, dated 22 / 09 / 2025, p.21 / 35 4 / 4 gripping (22) to the operator side (19) of the machine and out of the machine by the extraction device (20) - Separation of the blanket (3) from at least one gripping element (22) - Connection of a new blanket (3) to the drive side (21) of the new blanket (3) by means of at least one gripping element (22) with the retraction device (23) - Retraction of the new blanket (3) to the drive side (21) and into the machine by means of at least one gripping element (22) connected to the retraction device (23).

14. Method according to claim 13, characterized in that at least one gripping element (22) is designed as a clamp.

15. Method, according to any one of claims 13 or 14, characterized in that the retraction device (23) is designed as a winch and the extraction or retraction is performed manually and / or motorized. Petition 870250085454, dated 09 / 22 / 2025, p. 22 / 35

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