EP1057906B1 - Web producing installation and method - Google Patents

Description

The invention relates to a nonwoven system and a Operating method with the features in the preamble of Main procedural and device claim.

Such a fleece system is known from practice. she consists of at least one fleece layer, one of single layer fed to an upstream pile generator Folded pile in a multi-layer fleece and at least a downstream consolidation device.

From EP-A-0 315 930 it is known that the within Fleece system used fleece layer with a Equip profile forming device with which the density of the fleece changed over the laying width as desired can be. This can cause unwanted Changes in density, e.g. on the following Solidification device can occur preventively compensate. For the specific design of the Profile formation facility teaches citation one freely programmable control and separate and separate controllable drives of main car and laying tapes. By deliberate generation of speed differences at The pile tray and thus influencing the density of the fleece.

Fleece layers with other profile formation facilities are from EP-A-0 521 973, EP-A-0 371 948, WO 98/37264, EP 0 659 220, DE-A-43 04 988 and WO 97/19209 are known. The Profile formation of the fleece is based on this reached different ways, e.g. through changed Decrease speeds of the pile on the pile generator Change in the fleece layer speed level opposite the clutter, possibly including a intermediate memory, by different Laying widths when laying the flora on the discharge belt or etc. ..

From DE-A-38 43 180 it is also known Compensate for the layer closing error of the nonwoven layer. For this the density or mass per unit area of the leaking fleece measured to determine whether the Fleece formation is even and zigzag stored cardboard sheets with their edges in the desired Closing position overlap. This creates a spread over the entire width uniform fleece with a uniform density or Thickness achieved. This is the opposite of one Profiling.

JP 03193921A shows a similar fleece system. she consists of a card, a first fleece layer, one downstream second card, another fleece layer and a needle machine. About measuring devices is on different places the thickness or the sag of the Flors measured. Furthermore, the measuring devices Laying width of the fleece coming from the first fleece layer measured to ensure the correct closing of the layers at second fleece layer to ensure laid fleece. Based The carding machine and the needle machine are the results of the measurements controlled to the desired quality of the final product to reach. Through the various measuring devices in the fleece system is to ensure that the Process and the fleece system run stable and constant and that a controlled relationship between the thickness or Density of the end product and the setting of the card or Needle machine exists. You want to make changes the pile settings on the card directly affect take the desired results on the final product without that the process and plant components in between can have a distorting influence. A Profile change of the fleece takes place in this fleece system not instead. The fleece layers are conventional Design type. The measuring devices also have none disruptive influence on the function of the fleece layer.

It is an object of the present invention, such To improve the fleece system.

The invention solves this problem with the features in the main method and device claim.
In the nonwoven system according to the invention or in general the fiber system, a measuring device for determining the density of the nonwoven is arranged at a suitable location behind the outlet of the nonwoven layer. The density values determined are used to set the profile formation device, so that the desired profile formation can be specifically set and monitored or regulated. To automate the monitoring and control, it is advisable to connect the measuring device to the profile-forming device in a control loop and, furthermore, preferably to carry out the measurements continuously or at least intermittently. This allows the profile formation to be continuously monitored during operation and readjusted if any errors occur. The measuring device is preferably arranged behind the solidification device. In this way, it detects any density errors in the end product, which can be caused anywhere in a complete fleece system and can be compensated for by adjusting the profile formation in the fleece layer area, regardless of where it originates.

The fleece layer and the profile forming device can be in be formed in any suitable manner. In the preferred embodiment is the profile formation by Generation of speed difference between belt and Carriage speed at the pile outlet of the laying carriage generated. This version has advantages in the targeted Control of profile creation.

The measuring device can be used in any suitable manner be trained. For continuous operation and an online regulation is recommended optical or radiometric measuring equipment.

In the subclaims are further advantageous Embodiments of the invention specified.

Figur 1:

ein schematisches Anlagenkonzept einer Vliesanlage mit einem Vliesleger und einer Profilbildungseinrichtung nebst Dichtemesseinrichtung mit weiteren vorund nachgeschalteten Anlagenkomponenten und

Figur 2:

einen Querschnitt durch einen Vliesleger entsprechend Figur 1.

The invention is shown schematically and by way of example in the drawings. In detail show:

Figure 1:

a schematic system concept of a nonwoven system with a fleece layer and a profile forming device together with density measuring device with further upstream and downstream system components and

Figure 2:

2 shows a cross section through a fleece layer corresponding to FIG. 1.

Figure 1 shows a fleece system in a schematic representation (1). This consists of at least one fleece layer (4) a measuring device (13) for direct or indirect Determination of the density of the leaking fleece (10). to Extension of the fleece system (1) can a pile generator (2), e.g. a card, upstream his. The pile generator (2) can also be a device for Preparation of the fibers and other suitable components exhibit. The pile generator (2) creates a single layer Pile (3) of any suitable fibers, e.g. synthetic fibers or natural fibers, and leads them over suitable Funding the inlet or pile inlet (15) of the Fleece layer (4).

The fleece layer (4) folds the supplied single-ply pile (3) to form a transversely running, multi-layer fleece (10), which is placed on a discharge belt (11). The pile layers are zigzagged on the discharge belt (11) stored. The fleece (10) then becomes one suitable solidification device (12), e.g. one Needle machine or a thermofusion device, supplied in the fleece (10) in a suitable manner is solidified and compacted. The measuring device (13) is preferably on the outlet side behind the Solidification device (12) arranged. Alternatively or in addition, a measuring device (13) can also be used between the fleece layer (4) and the consolidation device (12) be arranged.

The fleece system (1) cannot beyond that included system components, e.g. a Stretching device, another pile generator etc., the for example between the fleece layer (4) and the Solidification device (12) can be arranged. Behind the consolidation device (12) or the measuring device (13) can be a cutting device, a winding device and other suitable Plant components can be arranged. As a variation of the shown embodiment can also several Fleece layer (4) can be arranged one behind the other.

The fleece layer (4) preferably has an integrated one Profile forming device (20) with which the density of the deposited fleece (10) influenced and over the Laying width can be changed in a targeted manner. The Profile forming device (20) can also Flor producers must be assigned. Basically, the Profile forming device (20) in any suitable Be trained and arranged. For example they correspond to EP 0 315 930, EP 0 371 948, the WO 98/37264, EP 0 659 220, DE-P 43 04 988, WO 97/19209 and DE-A-38 43 180 executed and placed his.

Usually the density is as constant as possible of the fleece over the entire width. This especially affects the solidified and finished treated end product that at the end of the complete Fleece system (1) comes out. In other cases, too different density distribution in a certain position and Size may be desired. These are the guidelines according to those the setting and regulation of Profiling device (20) aimed.

The density of the fleece can be measured using the measuring device (13) (10) can be determined. Preferably, the Measuring device (13) across the entire laying or Fleece width and measures the laying width in several places. It is recommended to optimize the Measurement results, to provide a large number of measurement points, which are arranged in a row or offset from one another and are positioned with the highest possible density.

The measuring device (13) preferably measures continuously. Alternatively, it can also be intermittent work, the density measurement during the Production operations are carried out several times.

The measurement results are used to set the Profile forming device (20). This setting can done manually by moving the density values over the Laying width of the measuring device (13) in a suitable Manner, e.g. be visually shown on a display. at Irregularities will occur Profile formation device (20) readjusted manually.

In the preferred embodiment, the measuring device (13) via a line (14) with the Profile forming device (20) in a control loop connected. The profile forming device (20) can do this a suitable freely programmable control (5) which e.g. a computer with one or more Processors, suitable interfaces and one or more Data and program storage included. In the control (5) a target / actual value comparison of the delivered Density data carried out and depending on the result the profile forming device (20) corresponds to a required control logic. This will make the Density of the fleece (10) continuously or at least intermittently monitored and automatically when required readjusted.

The density measurement is preferably carried out behind the Solidification device (12) on the compressed fleece (10) and thus on the end product. This will result in density errors recorded at any point within the Fleece system (1) can occur. Then you will regardless of the causer about the Profile formation device (20) readjusted and compensated. When the measuring device (13) is arranged Density errors can occur immediately behind the fleece layer (4) recorded in and in front of the fleece layer (4) arise. Density error in the solidification device (12) are not determined by this.

One of the main causes of the density errors mentioned is the solidification device (12). Here it comes from House to increase the fiber density in the edge area the fleece (10). The fleece shrinks during consolidation (10) on the longitudinal edges and forms a lateral Entry point. This leads to a higher compression in the longitudinal edge areas of the fleece (10). this Effect is made via the profile forming device (20) counteracted by the interior between these Margins in the formation of nonwovens by increased Flora deposit and an associated increased Fiber feed is increased. To compensate for this edge compressions essentially occur all types of solidification devices (12).

In addition, other density errors can be temporary and / or occur locally. You will e.g. caused by Irregularities in the pile production. Similarly can also within the solidification device (12) due to wear differences in the hardening across the laying width arise. This is e.g. the case when in the fleece system (1) fleeces of different widths (10) are manufactured. As a result, the inside use Needles or other strengthening elements stronger than that marginal and lead to a worse Compaction indoors. On the other hand, it also happens before that the fleece (10) is not always the center of symmetry Solidification device (12) is supplied and laterally can be offset in one direction or the other. This also leads to uneven wear and corresponding changes in consolidation and Densification behavior. Another cause also come Tolerances and irregularities in the formation of fleece and profile formation as the cause of compaction errors in Consideration. The actual profile formation then deviates the settings. All of these causes can be caused by the Measuring device (13) in connection with the Profile forming device (20) can be compensated.

The measuring device (13) can be used in any suitable manner be constructed constructively and as direct or indirect density measurement work. For one Online measurements are recommended radiometric Measuring devices that the fleece (10) with a Spreading width essentially evenly distributed Expose radiation and that by different Register density-induced radiation changes. Different densities can, for example, lead to one different distraction behavior and one lead to different scattering of the radiation. The Radiation can be of any suitable type, e.g. Beta radiation, pulsating microwaves or the like. The Density measurement in connection with a moisture measurement z. B. by the literature Kraszewski, Andrzej W. "Microwave Aquametry Needs and Prospectives" in IEEE Transactions on Microwave Theory and Techniques, vol. 39, no. 5, May 1991.

Furthermore there are also optical measuring devices (13) into consideration. This applies in particular to measuring systems that with the incident light or transmitted light method with e.g. a possibly pulsating infrared light source work. These density measurements and measuring systems can z. B. according to DD-A-260 766, DE-A-38 16 319, SU-A-1 295 340, US-A-4,865,054 or the EP-A-0 513 013.

In a further modification, it is possible to use the fleece (10) in several places above the laying width Pressure load cells or other suitable sensors locally weigh and determine the density. A Density measurement can also be done through the application of pressure or Force on the fleece (10) and measurement of the reaction force by means of a resilient pressure sensor, e.g. according to EP-A-0 087 611.

Figure 2 shows a preferred embodiment of the Fleece layer (4). He is a so-called fleece belt layer designed according to WO 97/19209. He has two endless and circular laying tapes (6,7), the independently by suitable drives (not shown) are driven. The laying tapes (6,7) are over two Main car (8.9) with independent drives (not shown) and arranged there deflection and Guided roles. In addition, two auxiliary vehicles (16,17) over which the laying tapes (6,7) are also guided by pulleys. The Auxiliary carriages (16, 17) are connected via suitable drive belts (18) or other connection means either independently driven or with the associated main car (8,9) connected. The auxiliary wagons (16, 17) tighten the Layers (6,7) and allow the two Main car (8.9) deviates from the normal Move the coupling reference against each other. By such Decoupling of the main carriage (8.9) from one another can internal tape and pile storage are formed which Edge thickening of the deposited fleece (10) prevented. This occurs at the reversal points of the lower one Main car or laying car (9) and braking and acceleration areas there Car movement only as much pile (3) as for one uniform pile placement is desired. Here can but also specifically by appropriate Velocity interventions form a profile of the fleece (10) can be achieved.

The fleece layer (4) is a so-called co-rotating Casually trained, where the two main cars (8,9) move regularly in the same direction, whereby with normal coupling the lower main carriage (9) twice the distance and twice the speed as that upper main car drives. With a parallel layer the two laying tapes (6,7) move between the two main carriages (8.9) directly in one in essential horizontal band section, the pile (3) between the laying tapes (6,7) in a pressing zone is guided and held with slight clamping. additionally can be on the upper main car or superstructure (8) closed belt inlet with another pressure zone to be available.

Alternatively, the fleece layer (4) can also be used as a so-called opposed layers similar to EP 0 315 930 his. Here, the two main carriages (8.9) move counter to each other, with the two laying tapes (6,7) between the main car (8,9) via a stationary Redirection are performed.

The profile forming device (20) is shown in FIG preferred embodiment part of the fleece layer (4) and affects the speed of the tapes (6,7) and the two separately driven and controllable main car (8.9). Here are the Profile formation deliberately differences in speed between the belt speed and the Laying carriage speed at the pile exit point on Laying carriage (9) generated. If the belt circulation speed is higher than the driving speed of the laying carriage (9), more pile emerges, resulting in a corresponding increase the fleece density leads. Conversely, with one Reduction of the belt circulation speed compared to the Laying carriage speed a reduction in Fleece density. The drives are controlled (5) the laying tapes (6,7) and the main carriage (8,9) separately set from each other and to any suitable Relative relationships set.

Deviating from the embodiment shown, the Profile forming device (20) in any other be designed in a suitable manner. You can do it for example the constructions and functions according to the EP-A-0 521 973, EP-A-0 371 948, WO 98/37264, EP-A-0 659 220, DE-A-43 04 988, WO 97/19209 and DE-A-38 43 180.

Modifications of the embodiment shown are also possible in another way. The fleece layer (4) can take place as a fleece belt layer also as a so-called wagon layer or be designed as a camelback layer. The same can the other components of the fleece system (1), in particular the pile generator (2) and the consolidation device (12) in any suitable manner in training and arrangement be modified.

LIST OF REFERENCE NUMBERS

1

Fleece plant, fiber plant

2

Pile generator, clutter

3

pile

4

lapper

5

control

6

laying belt

7

laying belt

8th

Main car, superstructure

9

Main car, laying car

10

fleece

11

Discharge Conveyor

12

Solidification device, needle machine

13

measuring device

14

management

15

Inlet, pile inlet

16

auxiliary carriage

17

auxiliary carriage

18

belts

19

Outlet, fleece spout

20

Profile educational institution

21

loop

Claims (11)

1. Method for operating a non-woven plant, consisting of at least one non-woven plaiter (4) which folds a web (3), supplied by a preceding web producer (2), into a multi-ply non-woven (10), a profile of the non-woven (10) being formed by means of a profile-forming device (20), and the non-woven (10) subsequently being discharged to at least one consolidating device (12), characterized in that, downstream of the outlet (19) of the non-woven plaiter (4), the density of the non-woven (10) is determined by means of a measuring device (13) and the profile-forming device (20) is set according to the measurement values in order to produce the desired non-woven profile.
2. Method according to Claim 1, characterized in that the profile-forming device (20) and the production of the non-woven profile are regulated automatically.
3. Method according to Claim 1 or 2, characterized in that the density of the non-woven (10) is measured radiometrically, optically, at pressure or via the non-woven weight.
4. Non-woven plant, consisting of at least one non-woven plaiter (4) for folding a web (3), supplied by a preceding web producer (2), into a multi-ply non-woven (10), the non-woven plaiter (4) having a profile-forming device (20) for the non-woven (10), and the non-woven (10) subsequently discharging to at least one consolidating device (12), characterized in that, downstream of the outlet (19) of the non-woven plaiter (4), a measuring device (13) is arranged for determining the density of the non-woven (10) and for setting the profile-forming device (20).
5. Non-woven plant according to Claim 4, characterized in that the measuring device (13) is connected to the profile-forming device (20) in a control loop (21).
6. Non-woven plant according to Claim 4 or 5, characterized in that the measuring device (13) operates continuously or at least intermittently.
7. Non-woven plant according to Claim 4, 5 or 6, characterized in that the measuring device (13) is arranged downstream of the consolidating device (12).
8. Non-woven plant according to one of Claims 4 to 7, characterized in that the measuring device. (13) is designed as an optical, radiometric or pressure-type measuring device.
9. Non-woven plant according to one of Claims 4 to 8, characterized in that the non-woven plaiter (4) has two driven plaiting belts (6, 7) rotating along closed paths and two main carriages (8, 9) controllable and driven separately from these.
10. Non-woven plant according to one of Claims 4 to 9, characterized in that the profile-forming device (20) has a freely programmable control (5) for the generation of profile-forming speed differences between the belt speed and the main-carriage speed.
11. Non-woven plant according to one of Claims 1 to 10, characterized in that the non-woven plaiter (4) has at least one auxiliary carriage (16, 17) for tensioning at least one plaiting belt (6, 7).

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