EP1038815A2 - Winding machine for continuously winding a material web - Google Patents

Abstract

Winding machine (1) for the continuous winding of a material web (4), in particular a paper or cardboard web, onto a reel (10) to form a winding reel (6), a, with a carrying drum (2), one with the winding reel (6) Nip (7) forms, b, with a bearing comprising at least one transport device, which guides the drum (10) along a preferably horizontal guideway, and c, with an air squeezing device (12) attached to the bottom of the winding machine (1) Winding roll (6) can be put on, the air squeezing device (12) being designed as at least one composite element (13) attached to at least one frame (16) with a base body (14) and a low-friction covering (15) attached to the possible contact surface, or the air squeezing device (12) consists of at least one contact element (20) attached to at least one frame (21) with the shape of a wing and with a low-friction coating (15) stands, or the air squeezing device (12) consists of an arrangement of several small individual rollers (17) which are attached to at least one frame (18). <IMAGE>

Description

The invention relates to a winding machine for the continuous winding of a material web, in particular a paper or cardboard web, on a reel to one Winding reel according to the preamble of claim 1, 6 or 17.

Such winding machines are well known and are particularly in Machines for the production or finishing of material webs, such as Paper or cardboard, used.

With modern winding concepts, it is necessary today to prepare a reel change the reel with the almost fully wound reel ("finished reel") to bring in an end position, in which then no active contact, no so-called Nip, there is more between the drum and the winding roll. In this Time in which there is no longer a nip must be ensured by suitable measures that air pockets between the individual layers of the almost fully wound Winding roll arise. The "wrapped" web tension must also be maintained are retained, so that the desired one also in the outer area of the winding roll To ensure winding quality. The problem that arises becomes all the more so larger, the faster the winding machines are operated (order of magnitude 1500 - 2000 m / min) and the larger the diameter of the finished drum (Size 2.5 - 4 m).

This has already been attempted in a winding machine of the type described To solve the problem, as in the German patent application DE 44 01 804 A1 (PR10035 DE) of the applicant. A facility is provided there comprising a pressure roller with an elastic coating attached to one by one Carrier drum removed winding roller can be pressed on by means of a pneumatic drive is. This facility has the purpose of creating air pockets between the to prevent individual layers of the winding roll and during the reel change to maintain the "wrapped" web tension. However, the pressure roller has the serious disadvantage that they have a deflection due to their own weight is subject to and therefore does not conform evenly to the surface contour of the almost fully wound winding roll over the web width. As The consequence of this is that the formation of air pockets between the outer layers of the almost fully wound winding roll are not completely avoided can be.

US Pat. No. 5,779,183 (= WO 95/34495) discloses a method and one Device for applying final web layers on the winding roll in a winding machine that was generated during the winding process. It is provided that before applying the final web layers an air squeezer is brought into active contact with the surface of the winding roll, that after that the winding roll while maintaining the active contact in its exchange position process and thereby a desired strength of the active contact for the purpose of Avoidance of air pockets between the individual layers of the Winding roll is maintained. The pressing air squeezing element of the air squeezing device is a brush. Experiments carried out have shown that the Using a brush can be disadvantageous in that the permanent danger there is that the brush hair damage sensitive types of paper that individual Loosen brush hair and get into the paper cycle as a contaminant or that the brush hair itself will be damaged.

Furthermore, winding machines are known in which after each reel change no contact between the carrying drum during the entire winding process and winding roll is present. That is why there is again an air squeezer with an air squeeze element in the form of a continuous contact with the winding roll Pressure roller provided.

Such a winding machine is, for example, from the two German utility models G 88 08 823.5 (= US 5,249,758) and DE 298 11 053 U1 known.

Both of the utility models mentioned are disadvantageous in that broad Paper or board machines are at risk of sagging. The construction method according to the aforementioned DE 298 11 053 U1 is because of the requirement that during the Winding process the point of contact of the sensing roller to the web in the winding direction a predeterminable angle after the starting point of the web while maintaining a Predeterminable contact pressure can be positioned on the web wound on the reel is complicated and expensive.

The invention is therefore based on the object of a winding machine for continuous To further develop winding of a material web of the type mentioned at the beginning, that both no air pockets between the individual layers of the winding roll due to unevenness in the surface contour of the almost fully wound The winding roll is created and the "wrapped" web tension is maintained remains.

According to the invention, the object can be achieved by different measures be specified in claims 1, 6 or 17.

According to a first aspect of the invention it is provided that the air squeezing device as at least one composite element attached to at least one frame with a base body and one attached to the possible contact surface low-friction surface is formed. This has the advantage that the individual components of the air squeeze device independently of one another and thus can be replaced inexpensively.

The length of the measured in the web running direction of the material web is preferably Composite element between 100 and 300 mm, preferably between 140 and 180 mm. This ensures that the functional safety of the air squeezing element is guaranteed continuously during operation and a sufficient length of Air squeeze device to prevent air pockets.

Another advantageous embodiment of the invention is when the low-friction Covering with a radius of curvature of 100 to 300 mm, preferably between 180 and 260 mm. This radius of curvature ensures that the air squeezing device along the active surface safely, that is with a minimum length in the circumferential direction of the almost fully wound winding roll,

One embodiment of the invention provides that the base body consists of a flexible material with an elastic modulus of 0.03 to 1 N / mm ² , preferably 0.05 to 0.2 N / mm ² . This results in strength values for the flexible material, which enables adaptation to different types of material webs.

Another embodiment of the invention provides that the base body from one solid material, in particular made of wood, thermoset, aluminum or steel, consists. These materials have good strength values and are characterized by this characterized by increased stability or rigidity, which in turn leads to a improved functional reliability of the composite element is guaranteed.

According to a second aspect of the invention it is provided that the air squeezing device from at least one attached to at least one frame Contact element with the shape of a wing and with a low-friction coating consists. This has the advantage that improved properties of the air squeeze device in terms of functional reliability, runnability and operating costs can be achieved with a very stable construction.

Another embodiment provides that the contact element with a spring element is provided for applying an adjustable contact pressure. As already stated, is due to the possibility of an adjustable, acting on the material web Contact pressure ensures that both at all times during the application of the Air squeezing device as well as an optimal at each contact point Balance of power is guaranteed.

eingewickelten" Bahnspannung zusätzlich positiv unterstützt.It is furthermore advantageous according to the invention if the air squeezing device additionally has an air nozzle, seen in the web running direction of the material web, upstream of the contact element, the effective area of which is directed against the material web. As a result, both the avoidance of air pockets between the individual layers of the winding roll due to unevenness in the surface contour of the almost fully wound winding roll and the maintenance of the

wrapped "web tension additionally supported.

In a first preferred embodiment of the invention, the low-friction covering consists of one layer, the one layer consisting of polytetrafluoroethylene or of glass fabric coated with polytetrafluoroethylene or of cotton fleece. In a second preferred embodiment of the invention, the low-friction covering consists of three layers, the first layer ( Top layer ") made of a glass fabric coated with polytetrafluoroethylene, the second layer ( Middle layer ") from a cover sheet and the third layer ( Underlay ") consists of a foam. Both low-friction coverings, as already mentioned above, have very good sliding properties and therefore have no wear-bearing influence on the material web. The tensile strength or the elongation at break of the glass fabric coated with polytetrafluoroethylene or the modulus of elasticity or the density of the foam have a positive effect on the aforementioned properties of the air squeezing element.

According to a third aspect of the invention it is provided that the air squeezing device consists of an arrangement of several small individual roles that at least are attached to a frame. By using small single rolls the advantage that the accelerating masses can be kept small, the efficiency of the air squeeze device being kept high can. Small individual rolls can also optimally adapt to the winding roll contour.

In a preferred embodiment, the individual rollers are parallel to one another in at least two Rows running parallel to the central axis of the winding roll are arranged.

This ensures that the surface pressure in the wound on the reel Material web can be kept relatively small.

In a further embodiment of the invention, the rows of individual rolls are in the direction the central axis of the winding roll are arranged offset. This ensures that there is no web in the longitudinal direction of the winding roll, through which air is unhindered can be wrapped. Furthermore, the emergence of marks is due to of large contact pressures and long contact times on individual paper or cardboard strips prevented.

It is also advantageous if the individual rolls have a roll diameter of 30 to 150 mm, preferably 80 mm. With these diameters can be very good efficiencies for the air squeeze device at optimal cost for the Achieve single roles.

It is also provided that the individual rolls with a soft rubber coating are provided. This ensures that on the one hand no surface damage arise on the material web and on the other hand a good contact between Material web and single roll can be produced, which in turn is an unhindered Prevents wrapping of air.

A further preferred embodiment is present when the individual roles with at least are each provided with a spring element for applying an adjustable contact pressure. Due to the possibility of an adjustable contact pressure acting on the material web it is ensured that both at all times during the application of the air squeeze device as well as an optimal balance of forces at each contact point is guaranteed.

It is also proposed according to the invention that when an effective range is formed between the winding roll and the air squeezing device, the effective force in the effective range is controllable by moving the air squeeze device. Hereby can be a good winding result, that is to say in the last winding layers, that is a winding roll with a defined, uniform winding hardness over the entire length Winding time can be achieved because a fine adjustment of the active force in the effective range between the winding roll and the air squeezing device even during the final Winding phase in which there is no nip between the carrier drum and the winding roll more is possible.

It is understood that the foregoing and those yet to be explained Features of the invention not only in the specified combination, but can also be used in other combinations or alone, without the Leave the scope of the invention.

Further features and advantages of the invention emerge from the subclaims and the following description of preferred exemplary embodiments with reference on the drawings.

Figur 1:

eine Seitenansicht einer Wickelmaschine mit erfindungsgemäßer Luftabquetschvorrichtung während der Hauptwickelphase;

Figur 2:

eine Seitenansicht einer Wickelmaschine mit erfindungsgemäßer Luftabquetschvorrichtung während der Endwickelphase und

Figuren 3-6:

vereinfachte Darstellungen von erfindungsgemäßen Luftabquetschvorrichtungen.

The invention will be explained in more detail below with reference to the drawings. They represent:

Figure 1:

a side view of a winding machine with air squeezing device according to the invention during the main winding phase;

Figure 2:

a side view of a winding machine with air squeezing device according to the invention during the final winding phase and

Figures 3-6:

Simplified representations of air squeezing devices according to the invention.

The winding machine 1 shown in FIG. 1 in a highly schematic form comprises a support drum 2, also referred to as a pressure drum or support roller, which either rigidly mounted or along an imaginary - dashed horizontal Straight line G can be displaced by means of a pressure device, not shown (Double arrow 3) and a drive, in the case shown a center drive, is driven. The different types of storage and movement for the Carrier drum 2 are particularly in the unpublished German patent application DE 198 07 897.8 (PR10678 DE) of the applicant. Your content will hereby made the subject of this description. The material web 4 is either from a smoothing mechanism not shown here or also not here either shown drying section of a paper or board machine, wraps around then first a spreader roll, not shown, and then runs in Direction of arrow on the outer surface 5 of the support drum 2, wraps around the outer surface 5 of the support drum 2 by a certain angle (circumferential area) until detachment through the resulting winding roll 6. The detachment of the material web 4 from the Carrier drum 2 and the transfer to the resulting winding roll 6 happens in so-called Nip 7, which is located between the carrier drum during the main winding phase 2 and the winding roller 6 forms. The winding roll 6 is by means of a not shown Lifting device of a movable transport device into the arrow 8 marked direction of movement. The lifting device can, for example be formed by a spindle drive, which is driven by an electric motor Includes threaded spindle. The transport device is used to hold and Guide the reel 10 of the winding roll resting on the rails (guideway) 9 6. A device for regulating the line force L arising in the nip 7 during the main winding phase is, for example, in the already mentioned, not previously published German patent application DE 198 07 897.8 (PR10678 DE) of the applicant disclosed. In the main winding phase shown in Figure 1, an empty Drum ("empty drum") 11 from a holding device, not shown, in one Distance from the drum 2 held ("standby position"). Below the winding roller 6 is the air squeezing device in dash-dotted form 12, which is in no active relationship during the main winding phase shown with the winding roller 6. Rather, it is in a waiting position. The air squeezer 12 can be both vertical with well known mechanisms as well as being moved horizontally.

FIG. 2 shows a side view of a winding machine 1 with an air squeezing device 12 according to the invention during the final winding phase. During this final winding phase, the winding roller 6 is moved away from the carrying drum 2 with the transport device already described, with the nip 7 being released and with the formation of a free web tension. The empty drum 11, previously held at a distance from the carrying drum 2, is then placed on the carrying drum 2 with the formation of a nip 7 by the holding device (not shown). The winding phase for the empty reel 11 then begins with the web separation (not shown), the winding roll 6 then no longer being wound and being moved horizontally into a removal position.
According to the invention, the air squeezing device 12 is now placed on the winding roller 6 before the nip 7 is dissolved between the carrying drum 2 and the winding roller 6. Immediately upon formation of an effective area between the winding roll 6 and the air squeezing device 12, the effective force W in the effective area B is regulated by a displacement of the air squeezing device 12. Such a control loop belongs to the knowledge of the average person skilled in the art and is disclosed, for example, in the applicant's previously mentioned, unpublished German patent application DE 198 07 897.8 (PR10678 DE) for a carrying drum. The air squeeze device 12 is displaced synchronously with the winding roll 6 while maintaining the effective force W in the effective area B. The synchronous displacement is only ended when the winding roll 6 is reached horizontally in its removal position.

Figures 3 to 6 represent simplified representations of air squeezing devices according to the invention 12 is common to all figures that both the Air squeeze carrier and the displacement device for the carrier is not shown.

FIG. 3a shows an air squeezing device 12 designed as a composite element 13. The composite element 13 consists of a base body 14, for example a flexible or a solid material, and a low-friction covering 15, for example a coating of polytetrafluoroethylene or of glass fabric coated with polytetrafluoroethylene or of cotton fleece . The composite element 13 is fixed on a frame 16. The low-friction coating 15 is preferably provided with a radius of curvature R of 180 to 260 mm and the length H of the composite element 13 measured in the web running direction is preferably 140 to 180 mm. FIG. 3b, on the other hand, shows an air squeezing device 12 designed as a composite element 13, which consists of a base body 14 and a low-friction coating 15. The low-friction covering 15 in turn consists of a first layer ( Top layer ") 15.1, consisting of a glass fabric coated with polytetrafluoroethylene, a second layer ( Middle layer ") 15.2, consisting of a cover film and a third layer ( 15.3, consisting of a foam. The statements made apply to the radius of curvature R and the length H of the composite element 13 measured in the web running direction.

FIG. 4 shows an air squeezing device 12 which is arranged in three rows Single rolls 17, which lie directly on the winding roll 6, are made. The illustrated three rows of single rolls are mounted on a common frame 18, each individual roller being supported by at least one spring mechanism 19 is and can be acted upon with an individually adjustable spring force F.

FIG. 5 shows view Y of FIG. 4. It can be clearly seen that the respective Single rollers 17 of the air squeezing device 12 in the direction of the central axis of the shown winding roll are arranged offset, preferably in the middle of each other are aligned.

FIG. 6 shows an air squeezing device 12, which consists of a contact element 20, which is attached to a frame 21 and has the shape of an airfoil and a low-friction coating. The contact element 20 is supported by a spring mechanism 22 and can be acted upon by an individually adjustable spring force F. The air squeezing device 12 additionally has, seen in the web running direction of the material web, an air nozzle 23 upstream of the contact element 20, the effective area of which is directed against the material web. As a result, both the avoidance of air inclusions between the individual layers of the winding roller 6 due to unevenness in the surface contour of the almost fully wound winding roller and the maintenance of the wrapped "web tension additionally supported.

In summary, it should be noted that the invention is a winding machine for the continuous winding of a material web of the type mentioned above is further developed that both no air pockets in the individual layers of the Winding roll due to unevenness in the surface contour of the almost fully wound Winding roll arise as well as the "wrapped" web tension upright preserved.

List of reference numbers

1

Winding machine

2nd

Carrier drum

3rd

Double arrow

4th

Material web

5

Lateral surface

6

Winding roll

7

Nip

8th

arrow

9

rail

10th

Drum

11

Empty drum ("empty drum")

12th

Air squeeze device

13

Composite element

14

Basic body

15

Low-friction surface

15.1

First location ( Top layer ")

15.2

Second layer ( Middle position ")

15.3

Third layer ( Document")

16

frame

17th

Single rolls

18th

frame

19th

Spring mechanism

20th

Contact element

21

frame

22

Spring mechanism

23

Air nozzle

B

Effective range

F

Spring force

G

Horizontal straight line

H

length

L

Line force

R

Radius of curvature

W

Effectiveness

Y

view

Claims (23)

Winding machine (1) for the continuous winding of a material web (4), in particular a paper or cardboard web, onto a reel (10) to form a winding roll (6), a, with a carrier drum (2) which forms a nip (7) with the winding roller (6), b, with a bearing comprising at least one transport device which guides the drum (10) along a preferably horizontal guideway and c, with an air squeeze device (12) attached in the lower region of the winding machine (6), which can be placed on the winding roller (6), characterized in that
the air squeezing device (12) is designed as at least one composite element (13) attached to at least one frame (16) with a base body (14) and a low-friction covering (15) attached to the possible contact surface. Winding machine according to claim 1,
characterized in that
the length (H) of the composite element (13) measured in the web running direction of the material web (4) is between 100 and 300 mm, preferably between 140 and 180 mm. Winding machine according to claim 1 or 2,
characterized in that
the low-friction covering (15) on the side facing the material web (4) has a radius of curvature (R) of 100 to 300 mm, preferably between 180 and 260 mm. Winding machine according to one of the preceding claims,
characterized in that
the base body (14) consists of a flexible material with a modulus of elasticity of 0.03 to 1 N / mm ² , preferably 0.05 to 0.2 N / mm ² . Winding machine according to one of claims 1 to 3,
characterized in that
the base body (14) consists of a solid material, in particular of wood, of thermoset, of aluminum or of steel. Winding machine according to the preamble of claim 1,
characterized in that
the air squeezing device (12) consists of at least one contact element (20) attached to at least one frame (21) with the shape of a wing and with a low-friction coating (15). Winding machine according to claim 6,
characterized in that
the contact element (20) is provided with a spring mechanism (22) for applying an adjustable contact pressure. Winding machine according to claim 6 or 7,
characterized in that
that the air squeezing device (12) additionally has an air nozzle (23), which is arranged upstream of the contact element (20) in the web running direction of the material web (4) and whose effective area is directed against the material web. Winding machine according to one of the preceding claims,
characterized in that
the low-friction covering (15) consists of one layer and the one layer consists of polytetrafluoroethylene or of glass fabric coated with polytetrafluoroethylene or of cotton fleece. Winding machine according to one of claims 1 to 8,
characterized in that
the low-friction covering (15) consists of three layers and the first layer (

Obertage ") (15.1) from a glass fabric coated with polytetrafluoroethylene, the second layer ( Middle layer ") (15.2) from a cover film and the third layer ( Underlay ") (15.3) consists of a foam. Winding machine according to one of claims 9 or 10,
characterized in that
the glass fabric coated with polytetrafluoroethylene has a basis weight of 100 to 200 g / m ² , preferably 125 to 175 g / m ² . Winding machine according to one of claims 9 to 11,
characterized in that
the glass fabric coated with polytetrafluoroethylene has a total thickness of 0.05 to 0.2 mm, preferably 0.1 to 0.15. Winding machine according to one of claims 9 to 12,
characterized in that
the glass fabric coated with polytetrafluoroethylene has a tensile strength of greater than 8 N / mm, preferably greater than 10 N / mm. Winding machine according to one of claims 9 to 13,
characterized in that
the glass fabric coated with polytetrafluoroethylene has an elongation at break of 2 to 10%, preferably 4 to 8%. Winding machine according to one of claims 10 to 14,
characterized in that
that the foam has a modulus of elasticity of 0.05 to 1 N / mm ² , preferably 0.05 to 0.2 N / mm ² . Winding machine according to one of claims 10 to 15,
characterized in that
that the foam has a density of 10 to 150 kg / m ³ , preferably 40 to 80 kg / m ³ . Winding machine according to the preamble of claim 1,
characterized in that
the air squeezing device (12) consists of an arrangement of several small individual rollers (17) which are attached to at least one frame (18). Winding machine according to claim 17,
characterized in that
the individual rolls (17) are arranged in at least two mutually parallel rows which run parallel to the central axis of the winding roll (6). Winding machine according to claim 17 or 18,
characterized in that
the rows of individual rolls (17) are arranged offset in the direction of the central axis of the winding roll (6). Winding machine according to one of claims 17 to 19,
characterized in that
the individual rolls (17) have a roll diameter of 30 to 150 mm, preferably 80 mm. Winding machine according to one of claims 17 to 20,
characterized in that
the individual rollers (17) are provided with a soft rubber coating. Winding machine according to one of claims 17 to 21,
characterized in that
the individual rollers (17) are each provided with at least one spring mechanism (19) for applying an adjustable contact pressure. Winding machine according to one of the preceding claims,
characterized in that
when an effective area (B) is formed between the winding roll (6) and the air squeezing device (12), the effective force (W) in the effective area (B) can be regulated by a displacement of the air squeezing device (12).

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