EP2630287A1

EP2630287A1 - Method and apparatus for producing a composite nonwoven

Info

Publication number: EP2630287A1
Application number: EP11781766.8A
Authority: EP
Inventors: Norbert KÜHL; Markus Hones
Original assignee: Hi Tech Textile Holding GmbH
Current assignee: Hi Tech Textile Holding GmbH
Priority date: 2010-10-21
Filing date: 2011-10-21
Publication date: 2013-08-28
Anticipated expiration: 2031-10-21
Also published as: EP2630287B1; US20130269154A1; CN103180501B; CN103180501A; WO2012052535A1

Abstract

The invention relates to a method for producing a composite nonwoven in a continuous process sequence, and to an apparatus for carrying out the method. Here, a fibrous web is formed by a carding device from a fibre strand, on the surface of which fibrous web subsequently a nonwoven layer of synthetic fibres is laid. To this end, the fibrous web is guided within a suction zone on a laydown belt to a melt-blowing device, in which the synthetic fibres are laid on the surface of the fibrous web by melt-blowing. The fibrous web which is covered with the nonwoven layer is subsequently laid by a nonwoven laying device in a plurality of layers to form the composite nonwoven.

Description

DESCRIPTION

Method and device for producing a

Verbundylieses

The invention relates to a method for producing a composite nonwoven fabric in a continuous process sequence and to an apparatus for carrying out the method.

For the production of composite nonwovens, it is generally known that the properties of the composite nonwoven fabric essentially by the interaction of several

Different types of nonwoven layers are determined. For example, in composite nonwovens used for

Noise insulation used, it has been found that in particular the material density differences of the

Fleece layers cause sound waves are compensated and little reflected. Such composite nonwovens, which are used for insulation and noise reduction, have a relatively low basis weight, so that special demands are made on their production.

From EP 1 058 618 B1 is a sound-absorbing

Thin-film laminate known, which consists of a foam or a nonwoven fabric and associated meltblown fibers. The foam or non-woven fabric is drawn off in the form of a web from a first roll, then sprayed with a contact adhesive and with a

Inf arotstrahler dried and then merged with a second web of meltblown fibers. Both tracks are then jointly through

Squeezing rollers guided and interconnected. Possibly. For example, another cover layer of a nonwoven web may be applied to the thin film laminate. These

The nonwoven topsheet may consist of a meltblown web provisionally bonded by ultrasound. The thin-film laminate is then placed in Cut pieces and fed to a molding press.

From WO 2006/108364 AI it is known to produce a single or multi-ply textile from polymeric nanofibers, which are obtained by electrospinning.

EP 0 501 842 B1 or DE 692 09 703 T2 deals with the production of a textile fabric for clothing production. A first nonwoven layer of microfibers is made by meltblowing, forming a second, carded nonwoven layer and then attaching it under the first layer. The two

Layers are entangled and bonded by fluid jets and then dried. The second carded nonwoven layer is preferably pre-needled. To connect the two layers also a distributed applied adhesive is used. Furthermore, a third nonwoven layer can be added. In a

Embodiment can be directly applied and formed on a second carded layer, a meltblown microfiber layer.

It is an object of the present invention to provide a better production technique for composite nonwovens.

A further object of the invention is to guide a batt produced by a carding device with the highest possible belt speed to a composite web. Further, an object of the invention is the formation of a multi-layer acoustic insulating nonwoven member.

The problem is solved by the independent process and device claims. Advantageous developments of the invention are characterized by the features and feature combinations of the respective

Subclaims defined. In EP 0501842 B1, in a production process, a composite nonwoven fabric is formed from a fiber web produced by a carding device and a nonwoven layer produced by a meltblown process. During meltblowing, the fibers are produced with the lowest possible air pressure and the greatest possible distance from the batt. However, this does not produce fine fibers. Therefore, the known method and the known device in

Essentially only suitable for the production of composite nonwovens with relatively high basis weights.

The claimed technique has the advantage that even very loose and lightweight laid batts can be safely combined with a nonwoven layer made by meltblowing. One through the fiber stream of the

Meltblowing caused swirling and alteration of the batt is avoided by moving the batt into a holding zone, e.g. a suction zone is guided, so that the batt on the depositing belt has a e.g. receives fixation generated via the suction flow. The at

Synthetic fibers produced by meltblowing are deposited in the region of the holding or suction zone to form a nonwoven layer directly on the fibrous web and in this connection connected to a compound. The thereby occurring excess blown air can also be advantageous over a

Absorb suction zone and remove. To the nonwoven layer produced as a cover layer in a structure of several

To be able to embed fibrous webs, the nonwoven fibrous web can be led out of the suction zone and directed to a web laying device. The

Fleece-laying device then combines several layers of the batt or compound to the composite web.

To ensure safe shrinkage of the batt in the

To obtain leebereich the melt blown and around the combined with the nonwoven layer batt from the Leading out lead region, the development of the invention is particularly advantageous in which the batt penetrates within the suction zone a plurality of successive suction regions with separately adjustable suction. This can be used to change the state of the

Fibrous adapted pressure conditions are generated on the storage belt, on the one hand to minimize a suction flow generated from the environment and on the other hand, the blown air generated by the melt blowing safely

take. In addition, can be different through

Pressure settings also affect the immediate deposition of the synthetic fibers to produce certain structures within the nonwoven layers. In principle, the batt can be formed from fibers and fiber mixtures of synthetic or natural fibers. For binding and solidification, however, it has proven to be particularly advantageous if the fibers or fiber mixtures are formed to form the batt with a weight fraction in the range between 10% and 100% of synthetic fibers.

Here, the method variant is preferably used, in which the fiber material of the synthetic fibers and the polymer melt for extruding the synthetic fibers are formed from an identical base material. This considerably improves the recycling of such composite nonwovens. The nonwoven layer on the surface of the batt is preferably laid with fine fibers to provide for the

Sound insulation to obtain advantageous properties. In that regard, the variant of the method is preferably used, in which the synthetic fibers during melt blowing with a fine fiber cross-section in the range of 0.2 μπι to

3 μπι be placed on the nonwoven layer on the batt. Depending on the application, however, the composite fleece can also be used produce coarser synthetic fibers advantageous.

The performance of the carding device is

exploited in particular with the variant of the method in which the batt is continuously guided after removal until it is deposited at a belt speed in the range of 50 m / min to 200 m / min. In this case, essentially the capacity of the fleece-laying device is decisive for the limitation of the belt speed.

In order to be able to produce different types of composite nonwovens, another method variant is used

proposed, in which a plurality of batts are taken parallel next to each other from the carding device and are pooled after the melt blowing and depositing the synthetic fibers, the nonwoven layer between the batt forms an intermediate layer.

Such double batt layers are particularly suitable for protecting the intermediate nonwoven layer of the synthetic fibers from further treatment. The structure and distribution of the synthetic fibers within the nonwoven layer remain unchanged and can thus already on the

required specific properties.

In principle, however, it is also possible, both batt parallel to each with a nonwoven layer

occupy, which are merged into a multi-layer nonwoven.

In order to ensure the cohesion of the overlaid in several layers of batt, it is further proposed to continuously feed the composite laid by the nonwoven fabric composite web to a solidification device and solidify. The solidification can be done mechanically, chemically or thermally. In order to obtain the respective nonwoven layers within the composite nonwoven fabric from the synthetic fibers as completely as possible, the process variant is particularly advantageous, in which the composite nonwoven is solidified by a thermal treatment in a belt dryer, wherein the

Bonded nonwoven during solidification by a

Calibration zone is performed, in which a relative to a guide belt adjustable calibration acts on a free top of the composite web. In addition to the

Solidification can be adjusted to a certain thickness of the composite nonwoven. The melting of the

Synthetic fibers within the nonwoven layers can advantageously be avoided in such a way that the fiber material of the synthetic fibers has a slightly higher melting point than the synthetic fibers of the fiber web. This can be advantageously achieved by additives even with the same base polymer. For the further processing of such composite nonwovens is further provided that the composite nonwoven is stored in a storage device to a winding or alternatively to a stack. In a stack formation, the memory device additionally has a

Cutting device to each cut the composite nonwoven into individual pieces of nonwoven, which are then stacked on top of each other.

To carry out the claimed method, the device according to the invention is provided. This preferably has a carding device, a

Pick-up device, a transport device and a further treatment, in particular a Fleece laying device, wherein between the pickup device and the

Further treatment or fleece laying a station for producing a nonwoven layer of synthetic fibers

is provided. To achieve the object of the invention is the station as a melt blown device

formed, which is associated with a holding, in particular suction. The suction device is preferred

arranged below a storage belt of the transport device, so that the guided on the storage belt

Fibrous web is held fixed on the storage belt via a suction effect.

The suction device for the suction of the storage belt is in accordance with an advantageous embodiment of

Device according to the invention formed by a plurality of suction chambers, which are connected to a vacuum source, the suction chambers are assigned to set an individual negative pressure separate control means. This allows both the position of the batt and the filing of synthetic fibers in the nonwoven layer into it

influence .

In order to produce as little waste material as possible in the production of the composite nonwoven fabric, the development of the device according to the invention is preferably used, in which the melt blowing device has a movable

Spinner has, which between a

Operating position above the storage belt and a

Rest position is guided laterally next to the storage belt. This can be a piecing and starting the

Perform melt blowing device outside the operating position, so that held in the operating position spinner head exclusively for the production of the

Verbundvlieses is usable.

In order to be able to produce combinations of fibrous webs, the device according to the invention is especially so

further developed that the pickup device has two separate pickup points, which cooperates with two band assemblies of the transport device for receiving and removing multiple batt. For the production of a Sandwich-type Fibrous combination with intermediate nonwoven layer, the variant of the device is used, in which one of the band assemblies cooperates with the storage belt and the second belt assembly with a

Transport section parallel to the storage belt above the

Spinner head is arranged. This can be done by the

Calibrating device removed fiber fleece without

Deflection can be performed in a plane. Alternatively, however, there is also the possibility that the second band arrangement has a second depositing band and that the second depositing band is assigned a second spinner head of the melt blowing device. Thus, several batt with combined nonwoven layer can be produced.

The further treatment of the composite web takes place within the device by means of a conveyor belt device which connects the web laying device with a solidification device and a storage device. Within the storage device, the composite fleece can thus be stored to form a roll or stack.

For solidification, it is proposed that the device has a belt dryer with a guide belt and a calibration belt arranged above the guide belt, wherein the calibration belt is designed to be height-adjustable relative to the guide belt. Thus, in addition to the solidifications also targeted material thicknesses on the

Bonded nonwoven be produced. The inventive method is described below with reference to some embodiments of the invention

Device for producing a composite nonwoven with reference to the accompanying figures explained in more detail.

They show:

Figure 1 shows schematically a first partial view of a first

Embodiment of an inventive

Contraption,

2 shows schematically a second partial view of the

Embodiment of Figure 1,

FIG. 3 schematically shows a cross-sectional view of FIG

Melt blowing device of the embodiment of Figure 1 in several operating positions, Figure 4 is a schematic partial view of another

Embodiment of the device according to the invention and

FIG. 5 schematically shows a partial view of another

Embodiment of the invention

Contraption .

The invention relates to a method and an apparatus for producing a composite nonwoven fabric (36) and to a sound-absorbing nonwoven element produced therefrom.

FIGS. 1 and 2 show a first exemplary embodiment of the device according to the invention for carrying out the method according to the invention. 1 is a partial view of the front half of the machine and in Figure 2 is a partial view of the rear half of the machine shown.

The device according to the invention has a carding device (1) in the front half of the machine according to FIG. The carding device (1) cooperates at one end with a feed device (2) and at the opposite end with a pickup device (7). Between the feed device (2) and the pickup device (7), a pre-drum (4) and a main drum (5) are arranged, on whose circumference a plurality of carding elements (6) act.

Between the feed device (2) and the pre-drum (4) a plurality of feed system (3) are provided for receiving a fiber stream continuously provided by the feed device (2) and leading to the pre-drum (4). At the pre-drum (4) and the main drum (5), the fibers are carded and over in the

Main drum (5) associated with pickup device (7) removed as a batt. It should be expressly mentioned at this point that the construction and the number of drums and carding elements used in the carding device are exemplary.

In principle, carding devices with only one drum can be used.

The pickup device (7) is in this

Embodiment formed by a customer roll system (8), which interacts directly with a conveyor belt (10.1) of a transport device (9). The

Transport device (9) is formed in this embodiment by a first conveyor belt (10.1), a storage belt (11) and a second conveyor belt (10.2), which cooperate together to form a batt (32)

continuously picked up by the carding device (1) and transported away. The storage belt (11) is on a top one

Melt blowing device (12) and associated with a holding device (17) on an underside. With the

Meltblown device (12) is at the surface of the batt (32) a nonwoven layer (35) made of meltblown

Synthetic fibers (33) applied, e.g. with a

Pressure gas flow. The composite of batt (32) and

Nonwoven layer (35) is referred to below as a compound. The holding device (17) can on the Faserflor (32) and / or on a compressed gas flow of the

Melt blowing device (12) act. It can e.g. hold the batt (32) on the storage belt (11) and

opposite to the impinging compressed gas flow with the

stabilize meltblown fibers (33). It can also lead to the pressure gas flow and the fiber flow

act. It can e.g. controls the pressure gas stream after the delivery of the fibers (33) to the Faserflor (32)

derived. The holding device (17) may e.g. when

Be formed suction.

The storage belt (11) is gas-permeable and is guided over a total of three suction chambers (18.1, 18.2 and 18.3) of the suction device (17). The suction chambers (18.1, 18.2 and 18.3) of the suction device (17) via separate suction lines (19.1, 19.2 and 19.3) independently of each other with a vacuum source (not shown here) and via associated control means (20.1, 20.2, 20.3) independently from each other in their suction power

adjustable.

Above the middle suction chamber (18.2) has the

A melt blowing device (12) comprises a spinner head (13) which is coupled by a melt line (34) to an extruder (14). The spinner head (13) also has a

Connection to a compressed gas supply (15), e.g.

Compressed air supply, on, via a control valve (16) with a compressed air source (not shown here) is connected. The spinning head (13) has at its

Bottom of a meltblown nozzle, located in the

Substantially extends over the entire width of the storage belt (11). The width of the meltblowing nozzle of the spinning head

(13) is identical to the working width of

Carding device (1). Thus, the working widths of the carding device (1) may be in the range of 2 m to 4 m and above. Accordingly, the width of the meltblowing die is also in the range of 2 m to 4 m.

The spinning head (13) and the extruder (14) are held in this embodiment on a movable support (21) through which the spinner head (13) between an operating position and a rest position is guided back and forth. By way of illustration, a cross section of the melt blowing device (12) in FIG

Operating position and shown in Figure 3.2 in the rest position. In so far, reference is made at this point in addition to the figures 3.1 and 3.2.

In the operating position, the spinning head (13) of the melt blowing device (12) is located directly above the depositing belt (11), which on its underside through the

Suction chamber (18.2) is sucked. The suction chamber (18.2) is connected via the suction line (19.2) and a control means (20.2) with a vacuum source, not shown here.

The carrier (21) of the spinning head (13) and the extruder

(14) is movable and can be

for example via a rail system or a

Roller system across the storage belt (11) back and forth

move. Here are the connections on the

Spinning head (13) unchanged. Thus, the spinning head (13) via the melt line (34) to the extruder (14). Via the compressed air supply (15) and the control valve (16) a connection to a pressure source is provided.

As shown in Figure 3.2, the carrier (21) can be moved so that the spinning head (13) in a

Rest position is obtained laterally next to the storage belt (11). In this position, maintenance work and piecing processes can be carried out at the start of the process without a fiber web (32) being guided on the depositing belt (11).

As shown in the illustration in Figure 1, in addition to the melt blowing device (12) is a fleece laying device

(22), wherein between the melt blowing device (12) and the nonwoven laying device (22), the conveyor belt (10.2) of the transport device (9) is held. The nonwoven laying device (22) is not closer here

shown depositing means to the over the

Transport belt (10.2) supplied batt (32) or

Compound in permanent and e.g. uniform reciprocation on a conveyor belt of a conveyor belt device

(23) lay down several layers and with a selectable number of layers and to form a composite fleece (36). Here, if necessary, the basis weight of the multilayer composite web (36) controlled or regulated as needed and in transverse and / or

Lengthwise consistently or locally changed (so-called profiling).

The conveyor belt device (23) is accordingly in dependence on the number of layers and of the

Tray width operated at a lower belt speed. The conveying direction of the conveyor belt device (23) is thus aligned transversely to the transport direction of the transport device (9). The following devices of the device according to the invention form a second

Machine side to which the facilities

are arranged one behind the other for further treatment of a composite nonwoven fabric. Thus, it is shown in FIG. 2 that the nonwoven laying device (22) subsequently follows a solidification device (24) and a storage device (28). In this embodiment, the solidification device (24) by a belt dryer (25) is formed, which

Guide band (26) and arranged above the guide band calibration strip (27) in a calibration zone. The calibration belt (27) is designed to be height-adjustable relative to the position of the guide belt (26) so that a composite web (36) guided on the guide belt (26) can be solidified with a specific material thickness. The consolidation takes place via a

Heat treatment and is considered in professional circles as

Thermobonding called. This is done by melting the fiber material of some fibers within the

Nonwoven composite produces a stable cohesion of all fibers. The laid by the fleece laying device (22),

multilayer composite nonwoven (36) is for this purpose by the

Conveyor belt device (23) of the solidification device (24) continuously supplied. On the outlet side of the solidification device (24), the storage device (28) is provided, which is formed in this embodiment by a winding station (29). The winding station (29) generates a nonwoven roll (30) from the continuously supplied composite nonwoven (36).

The invention shown in Figure 1 and 2

Device is particularly suitable to carry out the process for producing a composite nonwoven fabric (36) which is used as insulating or Dämmmaterial.

Such composite nonwovens usually have a relatively low basis weight and a relatively loose

Structure of contained within the composite nonwoven Fibers.

In the method, as in Figure 1 and Figure 2

is shown, first a continuous fiber stream of fibers or fiber mixtures of the carding device (1) abandoned. The fibers (31) are over the

Feed device (2) supplied and within the

Carding device (1) via one or more

Drum systems carded and used as a batt (32)

decreased. The batt (32) is over the

Transport device (9) recorded and continuously discharged. The conveyor belts (10.1) and (10.2) of

Transport device (9) are doing with a

Belt speed in the range of 50 m / min to 200 m / min operated. The tape speed is doing by the

Carding device (1) or the fleece laying device (22) determined.

In the further course, the batt (32) is transferred from the first conveyor belt (10.1) to the delivery belt (11) such that the batt (32) leads to the meltblowing device (12) in which a nonwoven layer is formed on the surface of the batt (32) (35) made of synthetic fibers (33) laid and the compound is formed. To receive and create the nonwoven layer (35) on the surface of the batt (32), the batt (32) on the storage belt (11) is passed through a holding zone, e.g. a suction zone, guided. The suction zone is formed in this embodiment by the three suction chambers (18.1, 18.2 and 18.3) In the suction zone, the underside of the storage belt (11), which is gas-permeable and, for example, a screen belt or

Cloth tape can be vacuumed. This will be a

Holding force on the batt (32) generated so that in the storage zone of the synthetic fibers (33), the structure of the

Fibrous (32) is maintained despite the resulting air bubbles during melt blowing. During meltblowing, a polymer melt is melted via an extruder (14) and fed to a spinning head (13). On the underside of the spinning head (13), a melt-blowing nozzle is provided, through which a plurality of synthetic fibers (33) are extruded and via a in the

Spinning head (13) also supplied compressed gas, e.g.

Compressed air, withdrawn and blown in the direction of the storage belt (11). The melt-blowing nozzle, the melt throughput and the compressed air setting are hereby preferably chosen such that relatively fine synthetic fibers (33) are produced. The synthetic fibers (33) have

preferably a fine fiber cross-section in the range of 0.5 μτα to 3 μπι to the nonwoven layer (35) on the

Surface of the batt (32) to form.

The synthetic fibers (33) are preferably deposited on the fibrous web (32) in the middle region of the suction zone so that the suction chambers (18.1 to 18.3) can be adjusted separately in an inlet region, in a contact region and in an outlet region of the suction chamber

Fibrous (32) different during meltblowing

Settings of the suction power are possible. On the one hand can be when entering the batt (32) a

generate sufficient holding force on the batt (32). On the other hand, the deposits of the synthetic fibers (33) can be influenced by different suction powers. In addition, the blown air generated by melt blowing can be incorporated into the deposition process of the synthetic fibers by the suction chamber ambient air. This allows additional effects and structures to be produced in the nonwoven layer.

After the nonwoven layer (35) on the surface of

Fibrous pile (32) is laid, the batt (32) with the nonwoven layer (35), i. the compound through which

Conveyor belt (10.2) of the fleece-laying device (22) supplied. By the fleece laying device (22) is the Fibrous web (32) with the nonwoven layer (35) laid in multiple layers to the desired composite nonwoven fabric (36). The composite nonwoven fabric (36) has, for example, at least two superimposed layers of the batt (32) or a plurality of double layers of the batt

Fibrous (32) or compounds on. The composite web (36) is continuously removed by the conveyor belt device (23) and fed to the solidification device (24). The belt speed of the conveyor belt device (23) is in this case dependent on the number of layers and on the laying width of the fleece laying device (22).

dependent .

Within the solidification device (24) is the

Bonded nonwoven (36) thermally consolidated, where in particular in a calibration zone on the interaction of the

Guide band (26) and the Kalibrierbandes (27) the

Material thickness of the composite web (36) is determined.

After solidification, the composite nonwoven fabric (36) is wound up into the nonwoven roll (30).

In the method and device shown in FIGS. 1 and 2, the formation of the batt (32)

preferably 100% synthetic fibers used.

Preferably, the fiber material of the

synthetic fibers and the polymer melt for

Extruding the synthetic fibers (33) formed from an identical base material. As a base material would be

for example, a polyester or a polypropylene

suitable. Here, the specific properties of the fiber material of the synthetic fibers and the

Fiber material of the synthetic fibers (33) matched to one another such that during the thermobonding substantially only the synthetic fibers in the batt (32) are melted for solidification. In that sense that is

Fiber material of synthetic fibers, also known as

Bikofasern can be formed with a something equipped with a lower melting point than the

Synthetic fibers.

However, the exemplary embodiment according to FIGS. 1 and 2 could also be extended in such a way that between the melt blowing device (12) and the

Fleece laying device (22) a second carding device is arranged with a pickup device to produce a second batt. The second batt would be placed on the batt layer so that the batt layer

sandwiched between a lower and upper

Fibrous layer is held.

In principle, it is possible to form one or both batt made of a fiber blend of synthetic fibers and natural fibers. In order to obtain sufficient strength in a thermobonding, at least 10% of the fibers are formed by synthetic fibers.

In the exemplary embodiment illustrated in FIGS. 1 and 2, a single-layer fiber web (32) for the production of the composite web (36) is removed from the carding device (1). Basically, however, there is also the

Possibility to form the pickup device (7) with several pickup points. Thus, in FIG. 4, a

Another embodiment of the invention

Apparatus for carrying out the inventive

Method shown schematically in a partial view. The embodiment is essentially identical to the aforementioned embodiment of Figure 1 and 2, so that at this point only the differences are explained and otherwise reference to the aforementioned

Description is taken. In the embodiment shown in Figure 4, the pickup device (7) forms two pickup points

(37.1) and (37.2). In each of the customer points (37.1) and

(37.2) is in each case a picking roller system (8)

provided to receive a respective Faserflor (32.1) and (32.2) and the transport device (9) to supply. The transport device (9) has in this

Embodiment, a lower band assembly (38.1) and an upper band assembly (38.2). The under

Band arrangement (38.1) is identical to the

Embodiment designed according to Figure 1 and 2. The upper band assembly (38.2) has a transport section

(10.3), which is guided parallel to the storage belt (11) above the spinner head (13). The upper

Band assembly (38.2) can in this case be formed in several parts by a plurality of conveyor belts or else in one piece by a circulating conveyor belt.

In the area between the meltblowing device (12) and the web laying device (22), both belt arrangements are made

(38.1) and (38.2) of the transport device (9) merged in such a way that the two battings (32.1) and

(32.2) are sandwiched and include between them the nonwoven layer (35). Subsequently, the multilayer nonwoven fabric or multilayer compound thus formed is fed to the nonwoven laying device (22) and laid down in several layers to form the composite nonwoven fabric (36).

In the formation of the nonwoven layer (35) by the

Meltblown device (12) is used in this

Embodiment, the suction zone formed only by a suction chamber (18) of the suction device (17). In this case, the suction chamber (18) preferably extends in the longitudinal direction of the storage belt (11) in such a way that immediately before or at the inlet of the fiber web (32) into the storage zone

Melt blowing device (12) has a holding force on the

Fibrous web (32) due to the suction effect of the suction chamber (18) is produced.

With the exemplary embodiment illustrated in FIG. 4, it is therefore possible to produce a multilayer fiber web (32.1, 32.2) with an inner nonwoven layer (35).

In principle, however, there is also the possibility that both fibrous webs (32.1) and (32.2) are covered with a nonwoven layer (35.1, 35.2) made of synthetic fibers. Thus, in FIG. 5, a further exemplary embodiment is shown schematically in a partial view, which is essentially identical to the exemplary embodiment in FIG. Compared to the aforementioned embodiment of Figure 4, the band assemblies (38.1) and (38.2) are identical, so that the band assembly (38.1) a lower storage band

(11.1) and the band assembly (38.2) an upper storage belt

(11.2). Each of the storage belts (11.1) and (11.2) is in each case assigned a suction chamber (18.1) and (18.2) which independently of one another convey the respective storage belts (11.1) and (11.2). Above the storage belts

(11.1) and (11.2) is a spinner (13.1) and

(13.2) of the melt blowing device (12). The spinning heads (13.1) and (13.2) are coupled together with an extruder (14).

Compared to the embodiment of Figure 4 is in the embodiment of Figure 5 at each of

Fibers (32.1) and (32.2) each generates a nonwoven layer (35.1) and (35.2). The nonwoven layers (35.1) and (35.2) can be identical or different in structure and construction.

Subsequently, the two battings (32.1) and

(32.2) merged with the laid on the surfaces nonwoven layers (35.1) and (35.2) and as a

Multilayer nonwoven or multilayer compound of

Fleece laying device (22) supplied. In that regard, that is The method shown and the apparatus shown can be expanded flexibly to produce single-layer or multi-ply batt for the production of composite nonwovens. In an advantageous variant of the invention, three fibrous webs could be produced simultaneously, for example by means of a kadi device, by means of three separate pickup locations, which can be converted into a multi-layer nonwoven or multi-layer compound via three conveyor belt systems

collapsed and fed to a fleece laying device. Between the Kadiereinrichtung and the

Fleece laying equipment could be two

Melt blowing devices may be arranged, which the

Transport belt systems are assigned, so that two of the three batt are covered with a nonwoven layer of synthetic fibers prior to merging. With this variant of the invention, multilayer nonwovens can advantageously be produced which contain synthetic fibers of two different polymers.

Alternatively, the meltblowing devices could also be assigned one after the other to a conveyor belt system in order to deposit two nonwoven layers on a batt. The illustrated in particular in Figures 1 and 2

Devices for producing the composite nonwoven are exemplary. In principle, the method according to the invention and the device according to the invention are also suitable for the production of composite tiles, in which the solidification is produced by chemical means or by mechanical means, such as needle punching. In addition, the composite nonwoven fabric can also be cut into individual nonwoven pieces for storage and then stacked to form a stack. In that regard, the winding station could be replaced by a stacking station. Further modifications of the illustrated and described embodiments are possible in various ways. The holding device (17) may be formed and arranged in a different manner, for example as an electrostatic or mechanical holding device, the the Faserflor (32) with electrostatic forces, hooks or needles or the like. on the storage belt (11, 11.1, 11.2) holds and stabilized against blowing. The storage belt (11, 11.1, 11.2) can in turn be gas-permeable. On a suction device can be omitted in these cases. A

Suction device may alternatively be present, but designed to be weaker. It is also possible to have a

Place the suction device elsewhere. In the embodiments shown, it sucks from the

Ablageband (11, 11.1, 11.2) and acts on the underside of the local Obertrums. It can alternatively be arranged elsewhere and outside the storage belt.

Instead of the described transport or conveyor belts, other conveyor means for the batt (32) may be used.

be used.

In the embodiments shown and described, the further treatment (device) (22)

Fleece laying device (22) e.g. as a stacker,

in particular as a stripper, running the

supplied einschichtigen or multi-layered compound on the discharge belt (23) zigzag-shaped and shingles with shingled layer formation or deposits. Alternatively, a fleece laying device (22) may be designed as a feeder, Camel-back-Leger or the like. The single- or multi-layered compound can be cut in further variation before storage and divided into pieces, the pieces are individually and optionally aligned one above the other to form a multilayer composite web (36) are placed on each other. The fleece laying device (22) is designed for this purpose in a correspondingly modified manner. In the illustrated and preferred embodiments, the mono- or multi-layer compound is fed to a nonwoven laying device (22) as soon as it is formed. In variation this can be an intermediate step between the

Compound formation and a fleece laying device (22) are inserted. Here, e.g. the single-layer or multi-layered compound are taken up and temporarily stored, whereby it is only at a later time of a fleece laying device (22) or another

Further processing is supplied. In which

Intermediate step may be said compound, e.g. in

be suitably stabilized and wound up. The further treatment can be designed in another way. Here, e.g. it is necessary to dispense with a multi-ply formation of the composite non-woven fabric (36) by directing said single-layer or multi-layered compound to another subsequent treatment, e.g. a solidification, in particular a needling, a thermobonding or the like. and possibly a storage is supplied.

From the single-layer or multilayer composite nonwoven (36), mat-like, shell-like or otherwise shaped soundproofing or sound-absorbing

Nonwoven elements are produced. For this purpose, if necessary, a molding process with pressing and possibly heating

be inserted. A multilayer composite fleece (36) with an outer and / or inner fleece layer (35, 35.1, 35.2) has particular advantages for the

Sound insulation. The exemplary embodiments shown for multilayer or sandwich formation of the composite nonwoven (36) are particularly advantageous for this purpose. A composite nonwoven fabric can also be produced in one layer in the aforementioned manner and used for insulation purposes. REFERENCE SIGN LIST

1 carding device

2 dining facilities

3 feed system

4 fore drum

5 main drum

6 carding elements

7 pickup device

8 customer roll system

9 transport device

10, 10.1, 10.2 conveyor belt

10.3 Transport section

11, 11.1, 11.2 Storage belt

12 melt blowing device

13, 13.1, 13.2. spinning head

14 extruders

15 compressed air supply

16 control valve

17 holding device, suction device

18, 18.1, 18.2, 18.3 Suction chamber

19, 19.1, 19.2, 19.3 Suction line

20, 20.1, 20.2, 20.3 control means

21 carriers

22 Further treatment, fleece blanket device

23 conveyor belt device

24 solidification device

25 belt dryer

26 guide band

27 Calibration band

28 storage device

29 winding station

30 fleece wrap

31 fibers

32, 32.1, 32.2 Fibrous pile

33 synthetic fibers

34 melt line 35, 35.1, 35.2 Nonwoven layer 36 Nonwoven composite

37.1, 37.2 pickup location 38.1 lower band arrangement 38.2 upper band arrangement

Claims

1.) Method for producing a composite nonwoven (36) in a continuous process sequence in several steps:

- Supplying a continuous fiber flow

consisting of fibers or fiber mixtures to a carding device (1),

Carding and removing the fibers to at least one batt (32),

Guiding the fibrous web (32) to a holding zone and holding the fibrous web (32) against a running conveyor within the holding zone,

- Melt blowing a variety of one

Polymer melt of extruded synthetic fibers (33) and depositing the synthetic fibers (33) to a nonwoven layer (35) on the batt (32) in the region of the holding zone,

- Leading out of the batt (32) with nonwoven layer

(35) from the holding zone to a

Further treatment (22), in particular one

Fleece laying device.

2.) Process according to claim 1, characterized

In other words, the fibrous web (32) is sucked into the conveying means in a holding zone designed as a suction zone.

3.) Process according to claim 1 or 2, characterized

e, that the fibrous web (32) within a suction zone passes through a plurality of successive suction regions with separately adjustable suction powers.

4.) The method of claim 1, 2 or 3, characterized

in that the nonwoven fibrous web (32) (32) is in a nonwoven laying device (22) is laid in several layers to a composite web (36).

Method according to one of the preceding claims, characterized in that the fibers or fiber mixtures are formed to form the batt (32) with a weight fraction in the range between 10% and 100% of synthetic fibers.

Method according to one of the preceding claims, characterized in that the

Fiber material of the synthetic fibers and the

Polymer melt for extruding the synthetic fibers (33) are formed from an identical base material.

Method according to one of the preceding claims, characterized in that the

Synthetic fibers (33) during melt blowing with a fine fiber cross section in the range of 0.2 μπι to 3μπι to the nonwoven layer (35) on the Faserflor (32) are placed.

Method according to one of the preceding claims, characterized in that the

Fibrous web (32) after removal until removal is performed continuously at a belt speed, preferably in the range 50 m / min to 200 m / min.

Method according to one of the preceding claims, characterized in that a plurality of fiber piles (32.1, 32.2) are stacked on top of each other

Carding device (1) are removed and after the melt-blowing and laying down the synthetic fibers (33) are folded together, the

Nonwoven layer (35) between the fibrous webs (32.1, 32.2) forms an intermediate layer.

Method according to one of the preceding claims, characterized in that a plurality of batts (32.1, 32.2) are each covered with a batt layer (35.1, 35.2) and that the batt (32.1, 32.2) is in contact with the batt layers (35.1, 35.2) before further treatment (32.1, 32.2). 22), in particular

Fleece-laying device to be merged into a multi-layer non-woven (36).

11.) Method according to one of the preceding claims, characterized in that one by a fleece laying device (22) laid

Composite nonwoven (36) continuously one

Solidification device (24) supplied and

is solidified.

12.) Method according to one of the preceding claims, characterized in that a

Bonding nonwoven (36) is solidified by a thermal treatment in a belt dryer, wherein the composite web (36) is guided during solidification through a calibration zone, in which a relative to a guide belt adjustable calibration belt

(27) on a free top of the composite web

(36) acts.

13.) Method according to one of the preceding claims, characterized in that a

Bonded nonwoven (36) of a storage device (28) is supplied and stored as a winding or as a stack. 14.) Apparatus for producing a composite web (36), with a card device (1), a

Pickup device (7), a transport device (9) and with further treatment (22),

in particular a fleece laying device, wherein between the pickup device (7) and the

Further treatment (22) a station (12) for

Creation of a nonwoven layer (35) is provided, characterized in that e e n e c i n e t that the

Station is designed as a melt blowing device (12) and that the melt blowing device (12) is associated with a holding device (17) which is arranged on the transport device (9).

15.) Device according to claim 14, characterized

There is no such thing as the

Holding device (17) as a suction device

is trained.

16.) Device according to claim 14 or 15, characterized

There is no such thing as a

Suction device (17) below a conveying means (11), in particular a storage belt, the

Transport device (9) is arranged.

17.) Device according to claim 14, 15 or 16, characterized in that it e e n e c e e s that a

Suction device (17) for sucking the storage belt (11) a plurality of suction chambers (18.1, 18.2, 18.3) and at least one vacuum source, wherein the suction chambers (18.1, 18.2, 18.3) for adjusting a negative pressure separate control means (20) are associated.

18.) Device according to one of claims 14 to 17,

By doing so, that the

Melt blowing device (12) has a movable

Spinning head (13), which between an operating position above the conveying means (11), in particular the depositing belt and a rest position can be guided laterally next to the conveying means (11).

19.) Device according to one of claims 14 to 18, characterized g e k e n e c i n e t that the

Pickup (7) two separate

Customer points (37.1, 37.2), with two band arrangements (38.1, 38.2) of

Transport device (9) for receiving and removing a plurality of bobbins (32.1, 32.2) cooperate.

20.) Device according to one of claims 14 to 19, characterized in that one of the belt assemblies (38.1) cooperates with the depositing belt (11) and that the second belt assembly (38.2) with a transport section (10.3) above the spinning head 13 parallel to the Storage belt (11) is arranged.

21.) Device according to one of claims 14 to 19, characterized in that a second belt arrangement (38.2) has a second storage belt (11.2) and in that the second storage belt (11.2) has a second spinning head (13.2)

Melt blowing device (12) is assigned.

22.) Device according to one of claims 14 to 20, characterized in that a nonwoven laying device (22) with a

Conveyor belt device (23), a

Solidification device (24) and a

Storage device (28) cooperates, wherein the laid by the fleece laying device (22)

Bonded nonwoven (36) is guided in a storage station (29) to a winding (30) or a stack. Device according to one of claims 14 to 20, characterized in that the solidification device (24) comprises a belt dryer (25) with a guide belt (26) and a above the guide belt (26) arranged calibration belt

(27) and that the calibration band (27) is designed to be height-adjustable relative to the guide band (26). Sound absorbing nonwoven element, characterized

That is, the nonwoven member has a composite nonwoven fabric (36) and is made according to any one of claims 1 to 13.