CN110662859A

CN110662859A - Carding machine

Info

Publication number: CN110662859A
Application number: CN201880034539.5A
Authority: CN
Inventors: 博多·赫特克斯; 斯文·汤姆森
Original assignee: Truetzschler GmbH and Co KG
Current assignee: Trutschler Group Europe
Priority date: 2017-08-04
Filing date: 2018-07-03
Publication date: 2020-01-07
Also published as: EP3662099B1; WO2019025108A1; DE102017117761A1; EP3662099A1

Abstract

The invention relates to a carding machine for producing a fibrous web from a fibrous material, comprising at least one cylinder (2) and comprising two doffers arranged immediately downstream of the cylinder (2) in the working direction and a press roll (8) which is in operative connection with all the doffers arranged downstream of the cylinder (2), wherein the carding machine (1) is designed to transfer at least two layers of loose fibres (20) to the press roll (8) by means of the at least two doffers, wherein each of the at least two layers of loose fibres is compressed separately by means of the press roll (8) and is integrated into a single layer of loose fibres (20) on the press roll (8) and the layer of loose fibres (20) is drawn off for further processing by means of a transfer roll (9) at the discharge side of the carding machine. The invention is characterized in that the press roll (8) has a diameter of at least 600 mm.

Description

Carding machine

Technical Field

The invention relates to a carding machine for producing a fibrous web from a fibrous material, comprising at least one cylinder and comprising two doffers arranged immediately downstream in the working direction and a press roll in operative connection with all doffers arranged downstream of the cylinder, wherein the carding machine is designed to transfer at least two layers of loose fibres to the press roll by means of the at least two doffers, wherein each of the at least two layers of loose fibres is compressed separately by means of the press roll and integrated into a single layer of loose fibres on the press roll and the layer of loose fibres is drawn off for further processing at the discharge side of the carding machine by means of the transfer roll.

Background

Conventional carding machines have a cylinder from which loose fibres are removed at one or more locations. Each layer of loose fibres is compressed individually and then stacked or simply loosely stacked on top of each other on a take-off device, such as a conveyor belt.

EP0661394B1 describes a carding machine in which overlapping and compression of the loose fibre layers is effected on a first or second press roll. The carding machine has the disadvantage that after the cylinder at least one random roll, one doffer and two successive press rolls are arranged for each layer of loose fibres, which increases the size of the carding machine.

Disclosure of Invention

The aim of the invention is to provide a short carding machine with high carding efficiency and good connection of loose fiber layers to each other.

The invention solves the proposed task by the teaching according to claim 1. Further advantageous embodiments of the invention are characterized by the dependent claims.

According to the technical teaching of claim 1, a carding machine for producing a fibrous web from a fibrous material comprises at least one cylinder with at least two doffers arranged one behind the other in the working direction. The carding machine further comprises a press roll which is in operative connection with all doffers arranged downstream of the cylinder, wherein the carding machine is designed to transfer at least two layers of loose fibers to the press roll by means of at least two doffers, wherein each of the at least two layers of loose fibers is compressed separately by means of the press roll and integrated on the press roll into a single layer of loose fibers and the layer of loose fibers is drawn off for further processing by means of the transfer roll at the discharge side of the carding machine.

The invention is characterized in that the press rolls have a diameter of at least 600 mm. Since the peripheral speed of the press rolls is also lower than the peripheral speed of the doffers below and above, it is achieved that at least two layers of loose fibres are compressed and overlapped before the extraction means inside the carding machine. The structural length of the carding machine is increased, usually by increasing the roll diameter. Surprisingly, it has been shown that a number of advantages are combined by increasing the roll diameter. On the one hand, positions are provided for the delivery of more loose fibre layers onto the press roll with more and larger doffers. At least one roll and one or two further drawing devices can then be dispensed with, which reduces the overall length of the carding machine. The bearing positions, the drive and the associated synchronization are thereby also omitted, which simplifies the operation of the carding machine, in particular with regard to control.

A further advantage is that, due to the increase of the diameter of the press rolls to at least 600mm, the peripheral speed of the press rolls and thus the centrifugal force is reduced, so that fibre fly-around can be reduced.

Further reduction of fiber fly-off may preferably be achieved by increasing the diameter of the press roll to a diameter of at least 800 mm. The dimensions described are also advantageous in view of the geometrical arrangement of the upstream doffer, since this can also be increased. The possibility of increasing the press roll to a diameter of at least 800mm is achieved by up to six doffers each compressing or elongating a stack or a layer of loose fibres individually together with the press roll and integrating and overlapping these individual stacks or layers of loose fibres on the press roll.

The diameters given here relate to the roll diameter which is not clothed. The transport path of the fibers from the feed side via the cylinder to the discharge side is considered here as the working direction.

The doffer preferably has a diameter of at least 350mm, preferably a diameter of at least 380mm, particularly preferably a diameter of at least 400 mm. Increasing the diameter of the doffer decreases the peripheral speed at which the bulk fibers are continuously transported by the peripheral speed. Reducing the peripheral speed reduces the centrifugal forces acting on the fibres. The fiber fly-away is thereby reduced, so that the productivity is increased at high carding quality.

In a preferred embodiment, the doffer is designed in such a way that it is operated at the same peripheral speed. Whereby the subsequent press rolls compress or elongate each layer of loose fibres or each stack of loose fibres in the same way.

Preferably, the loose fibres are guided from the cylinder to the doffer by means of transfer rolls. Additional lengthening or compression of the bulk fibres can be achieved by the transfer rollers, whereby the mixing of the bulk fibres can be improved.

The transfer roll can be designed as a random roll, with which the MD/CD ratio of the fibers can be optimized.

In a preferred embodiment, the upper doffer has a larger diameter than the lower doffer. This provides a free space for the structural design, so that up to six doffers with different stepped diameters can be brought into operative connection with the pressure roller.

Since the doffer has a lower peripheral speed than the transfer roll, a compression of the loose fibres is achieved, which contributes to a good mixing.

All the layers or bundles of loose fibers are compressed individually during the transfer from the doffer to the press roll by the higher peripheral speed of the doffer compared to the press roll and are subsequently collected and overlapped on the press roll.

The carding machine can preferably have up to six doffers which are simultaneously in operative connection with the press rolls. This allows a high productivity to be achieved while the carding machine has a short overall length.

The press roll can advantageously be configured as a card clothing roll or as a pin roll.

The internal suction of the press rolls improves the collection and overlapping of the individual loose-fibre layers, in particular when the loose-fibre layers or the loose-fibre bundles have a very low weight.

Drawings

The invention is further explained below on the basis of possible, schematically illustrated embodiments. Shows that:

FIG. 1 is a carding machine according to the invention with a discharge side;

FIG. 2 is another embodiment of a carding machine having an outfeed side according to the invention;

FIG. 3 is another embodiment of a carding machine having an outfeed side according to the invention.

Detailed Description

Fig. 1 shows a carding machine 1 according to the invention, which has an unillustrated infeed side for a fiber strand and an outfeed side 1b for loose fibers 20.

In the carding machine 1, the fiber bundles are guided at the feed side of the device and are guided via rollers, not shown here, of the front drum, or directly to the cylinder 2, where the fiber bundles in the first stage are loosened into individual fibers and aligned. During the transport of the fiber strand on the cylinder 2, the stripping and working rollers 3, 4 fix the fibers on the cylinder 2 in such a way that first loose fibers 20 are formed. The loose fibres can be extracted from the cylinder 2 by means of a transfer roll 5. The cylinder 2 is rotated in the clockwise direction and its clothing or teeth are likewise tilted in the clockwise direction or in the direction of rotation. The transfer roller 5 rotates counter to the clockwise direction, wherein the clothing or teeth of the transfer roller 5 are inclined in the direction of rotation counter to the clockwise direction. The lower doffer 7 receives the first layer of loose fibres 20 and rotates in a clockwise direction there. The remaining second layer of loose fibres 20 is removed from the transfer roll 5 by the upper doffer 6, which doffer 6 also rotates in a clockwise direction. The clothing or teeth of the two doffers 6, 7 are inclined counter to the clockwise direction and counter to the direction of rotation of the doffers 6, 7. The following press rolls 8 receive two layers of loose fibres 20 from the doffers 6, 7 below and above. The pressure roller 8 is rotated again counter to the clockwise direction, the clothing or teeth of the pressure roller 8 being inclined in the clockwise direction. The subsequent delivery roll 9 delivers the bulk fibres 20 from the press roll 8 onto the conveyor belt 10.

The invention is characterized in that the pressure roller 8 has a diameter of at least 600mm, wherein the peripheral speed of the pressure roller 8 is smaller than the peripheral speeds of the lower and upper doffers 7, 6. Whereby compression and overlapping of at least two layers of loose fibres 20 is achieved in front of the extraction means in the carding machine 1. By enlarging the pressure roller 8, at least one roller and one or two further extraction devices can be dispensed with, which reduces the overall length of the carding machine. A further advantage is that, due to the increase of the diameter of the press rolls 8 to at least 600mm, the peripheral speed of the press rolls and thus the centrifugal force are reduced, so that fibre fly-around can be reduced.

Further reduction of fiber fly-away can be achieved by increasing the diameter of the press roll 8 to at least 800 mm. The dimensions described are also advantageous in view of the geometrical arrangement of the upstream doffers 6, 7, since this way the doffers can also be enlarged.

A further advantage of the invention is that the doffers 6, 7 arranged between the transfer roll 5 and the pressure roll 8 are likewise enlarged compared to the prior art. As the diameter of the doffers 6, 7 is increased to at least 350mm, the peripheral speed and thus the centrifugal force acting on the fibers are reduced, thus reducing the fiber fly-away. The doffers 6, 7 preferably have a diameter of at least 380mm, particularly preferably at least 400 mm. Preferably, the upper doffer 6 has a larger diameter than the lower doffer 7. Running the two doffers 6, 7 at the same peripheral speed ensures the same drawing when the bulk fibres 20 are delivered to the press roll 8.

Alternatively, it is also possible to run the doffers 6, 7 with different circumferential speeds, so that each layer of loose fibres is compressed to a different extent and thus has a different density. This is advantageous for products where the density should be variable in cross-section.

The transfer roll 5 can also be configured as a random roll, depending on the web to be produced, for influencing the orientation of the fibers (MD/CD).

The following embodiments relate to exemplary carding machine configurations having a working width of 2.5 m. The height without clothing gives the diameter of the roll.

TABLE 1

Fig. 2 shows a further exemplary embodiment of a carding machine 1 according to the invention, which has an unillustrated infeed side for the fiber strand and an outfeed side 1b for the loose fibers 20.

In contrast to the exemplary embodiment of fig. 1, the transfer roller 5 is omitted, which reduces the installation space of the carding machine 1 again. The first layer of loose fibres 20 is extracted from the cylinder 2 by the upper doffer 6. The cylinder 2 is rotated in the clockwise direction and its clothing or teeth are likewise tilted in the clockwise direction or in the direction of rotation. The upper doffer 6 is turned counter to the clockwise direction and its clothing or teeth are inclined in the clockwise direction of rotation. The lower doffer 7 receives the second layer of loose fibres 20 and rotates in this case counter to the clockwise direction.

The clothing or teeth of the two doffers 6, 7 are inclined in the clockwise direction and counter to the direction of rotation of the doffers 6, 7. The following press rolls 8 receive two layers of loose fibres 20 from the doffers 6, 7 below and above. The pressure roller 8 is rotated again in the clockwise direction, the clothing or teeth of the pressure roller being inclined against the clockwise direction and against the direction of rotation. The subsequent delivery roll 9 delivers the bulk fibres 20 from the press roll 8 onto the conveyor belt 10. The diameter of the pressure roller 8 is also at least 600mm in this embodiment, wherein the peripheral speed of the pressure roller 8 is smaller than the peripheral speed of the lower and upper doffers 7, 6. Whereby compression and overlapping of at least two layers of loose fibres 20 is achieved in front of the extraction means in the carding machine 1.

By enlarging the pressure roller 8, at least one roller and one or two further drawing devices can be dispensed with, which reduces the overall length of the carding machine. A further advantage is that, due to the increase of the diameter of the press rolls 8 to at least 600mm, the peripheral speed of the press rolls and thus the centrifugal force are reduced, so that fibre fly-around can be reduced. Further reduction of fiber fly-away can be achieved by increasing the diameter of the press roll 8 to at least 800 mm. The dimensions described are also advantageous in view of the geometrical arrangement of the upstream doffers 6, 7, since this way the doffers can also be enlarged.

A further advantage of the invention is that the doffers 6, 7 arranged between the cylinder 2 and the pressure roller 8 are likewise enlarged compared to the prior art.

As the diameter of the doffers 6, 7 is increased to at least 350mm, the peripheral speed and thus the centrifugal force acting on the fibers are reduced, thus reducing the fiber fly-away. The doffers 6, 7 preferably have a diameter of at least 380mm, particularly preferably at least 400 mm. Preferably, the upper doffer 6 has a larger diameter than the lower doffer 7. Running the two doffers 6, 7 at the same peripheral speed ensures the same drawing when the bulk fibres 20 are delivered to the press roll 8.

TABLE 2

Since the doffers 6, 7 have the same speed, the same drawing or the same compression is always achieved by the pressure roller 8 for both layers of loose fibres 20.

Increasing the roll diameter of the doffers 6, 7 and the pressure rolls 8 achieves operation at a lower peripheral speed, so that the centrifugal forces acting on the bulk fibres 20 are smaller than according to the prior art. The carding machine can be operated with higher productivity while high carding quality is achieved. By increasing the diameter, an improved transfer of the loose fibres 20 can be achieved, whereby at least one roller can be dispensed with, and two rollers can be dispensed with depending on the design of the carding machine, so that the structural length of the carding machine is reduced despite the increasing diameter of the doffers and the press rolls 6, 7, 8.

The exemplary embodiment of fig. 3 differs from the exemplary embodiment of fig. 2 only by a third doffer 11, which is arranged between the doffers 6 and 7 and with which a third layer or stack of loose fibers 20 can be transferred from the cylinder 2 to the pressure roller 8. It is obvious that depending on the roll diameter, it is also possible to transfer four to six layers or stacks of bulk fibres 20 from the cylinder 2 according to this embodiment or from the transfer roll to the press roll 8 according to the embodiment of fig. 1. In this embodiment, all doffers 6, 7, 11 can also have the same peripheral speed, so that the bulk fibres of each layer or stack are subjected to the same compression by the pressure roller 8.

Alternatively, it is also possible to drive the doffers 6, 7, 11 with different circumferential speeds, so that each layer of loose fibres is compressed to a different extent and thus has a different density. This is advantageous for products where the density should be variable in cross-section.

The entire bulk fibre 20 can be completely removed from the cylinder 2 or the transfer roll 5 by means of the three-layer bulk fibre 20 being transferred from the cylinder 2 or the transfer roll 5 to the pressure roll 8 by means of the doffers 6, 7, 11.

The press rolls 8 are configured as card clothing rolls or pin rolls depending on the fiber quality. Further improvements to the receiving or stacking of loose fibre layers can be achieved by the suction pressure roller 8 from the inside.

The doffers 6, 7, 11 are configured as active fluff extractors together with the press roll 8. That is, the doffers 6, 7, 11 have opposite directions of rotation for the platen roller 8. At the same time, the teeth of the clothing are directed obliquely against the direction of rotation of the

rollers

6, 7, 8, 11. The peripheral speed of the pressure roller 8 is smaller than the peripheral speed of the doffers 6, 7, 11, thereby compressing the bulk fibres 20.

List of reference numerals

1 carding machine

1b discharge side

2 Cylinder

3 stripping roller

4 working roll

5 transfer roll

6 doffer

7 doffer

8 press roll

9 delivery roll

10 conveyor belt

11 doffer

20 bulk fiber

Claims

1. Carding machine for producing a fibrous web from a fibrous material, comprising at least one cylinder (2), and comprising two doffers (6, 7, 11) and a pressure roller (8) arranged immediately in the working direction, the press rolls are in operative connection with all doffers (6, 7, 11) arranged downstream of the cylinder (2), wherein the carding machine (1) is designed to transfer at least two layers of loose fibres (20) to the press roll (8) by means of at least two doffers (6, 7, 11), wherein each of at least two layers of loose fibres is compressed separately by means of a press roll (8) and integrated on the press roll (8) into a single layer of loose fibres (20) and the layer of loose fibres (20) is drawn off for further processing by means of a delivery roll (9) at the discharge side of the carding machine, characterized in that the press roll (8) has a diameter of at least 600 mm.

2. Carding machine according to claim 1, characterised in that the press rolls (8) have a diameter of at least 800 mm.

3. A carding machine as claimed in claim 1 or 2, characterised in that the doffers (6, 7) have a diameter of at least 350mm, preferably at least 380mm, particularly preferably at least 400 mm.

4. A carding machine as in claim 1, characterised in that the loose fibres (20) are guided from the cylinder (2) onto the doffers (6, 7, 11) by means of transfer rolls (5).

5. A carding machine as claimed in claim 4, characterised in that the transfer roller (5) is configured as a random roller.

6. A carding machine as in any of the preceding claims, characterised in that the doffers (6, 7, 11) are operated with the same peripheral speed.

7. Carding machine according to claim 4, characterised in that the upper doffer (6) has a larger diameter than the lower doffer (7).

8. A carding machine as in any of the preceding claims, characterised in that the doffers (6, 7, 11) have a lower peripheral speed than the transfer rolls (5).

9. A carding machine as in any of the preceding claims, characterised in that the doffers (6, 7, 11) have a higher peripheral speed than the press rolls (8).

10. A carding machine as in any of the preceding claims, having three to six doffers.

11. A carding machine as claimed in any preceding claim, characterised in that the press rolls (8) are configured as card clothing rolls or as pin rolls.

12. A carding machine as in any claim hereinbefore, characterized in that the press rolls (8) are internally sucked.

13. A carding machine as in any of the preceding claims, characterised in that the doffers (6, 7, 11) have a direction of rotation opposite to the pressure rollers (8) and the teeth of the clothing are obliquely directed opposite to the direction of rotation of the respective roller (6, 7, 8, 11).