WO2008129067A2

WO2008129067A2 - Melt blow device and method for supplying process air in a melt blow device

Info

Publication number: WO2008129067A2
Application number: PCT/EP2008/054957
Authority: WO
Inventors: Ernst-August Volk; Joachim Bauer; Czeslaw Olszewski
Original assignee: Maschinenfabrik Rieter Ag
Priority date: 2007-04-23
Filing date: 2008-04-23
Publication date: 2008-10-30
Also published as: WO2008129067A3; DE102007019353B4; DE102007019353A1

Abstract

In a melt blow device (2) comprising a melt line (17) disposed in a nozzle bank (2), spinnarets, and a mouthpiece for the production of filaments formed from a melt and comprising an air supply device comprising one air gap (9) disposed along the mouthpiece on each side of the mouthpiece, the necessary process air may be supplied to the air gap (9) via a supply channel (4) running in the direction of the air gap (9). The supply channel (4) is connected to the air gap (9) via a plurality of air conduits. At least one balancing chamber (6) is provided between the supply channel (4) and the air gap (9), said balancing chamber connecting multiple air conduits (5, 7, 8) to one another. The first air conduits (5; 8) empty into second air conduits (8; 7) and the air conduits (5, 8; 8, 7) have different cross sections. A melt line (17) and/or the air supply device are partially disposed in the nozzle bank (2) and machine beam (3), respectively, and empty on the bottom of the nozzle bank (2) or the top of the machine beam (3) and are detachably connected to one another. According to the method according to the invention, a pressure and flow balancing is conducted for the even flow of a stream of air out of the air gap (9) in that the stream of air is separated multiple times and recombined.

Description

A melt blowing apparatus and method for supplying process air in a meltblowing apparatus

The present invention relates to a meltblowing apparatus having a melt line, spinnerets and a mouthpiece formed in a die set for producing melt-formed filaments corresponding to the melt blow spinning method and an air supply device each having one side of the mouthpiece aligned along the mouthpiece Air gap includes, wherein the required process air is supplied via a running in the direction of the air gap supply channel to the air gap, and the supply channel is connected via a plurality of preferably arranged in rows holes with the air gap and a method for supplying process air in a melt blowing device.

A known melt blowing device is described for example in DE 693 19 582 T2. It thus smallest filaments are produced with which, for example, a nonwoven fabric can be produced. In the present application, filaments are referred to below as well as endless and also finite fibers, as obtained in the production process of melt-blown spinning. In this case, the melt is forced through a melt line and through a plate with very fine spinnerets in a nozzle package of the melt blowing device. Through the spinnerets, the filaments are produced, which are cooled after exiting the plate by a process air is fed from both sides against the still hot filaments. On the one hand, it is important that the process air reaches the filaments very evenly in order to produce a uniform cooling. The process air also serves to stretch the filaments so that it is also necessary for the process air to be applied uniformly and without undue turbulence to the filaments. lead to obtain uniform filaments. In DE 693 19 582 T2 is proposed for this purpose that the process air is supplied via a plurality of bores a gap which opens after a few deflections in the region of the freshly generated filaments. For cleaning, the nozzle package is removed either laterally or downwards from a shaped body which remains in the machine. The cleaning of the shaped body, in particular in the area of the melt supply and the air supply, is therefore difficult. Also results from the supply of process air through relatively widely spaced channels in the molding an uneven exit velocity of the process air in the filaments. The process air also has a component in the direction of the opening of the air gap, whereby the filaments are prevented at a quiet exit without turbulence.

The direction of the opening of the air gap is referred to as the cross machine direction, the direction in which the fleece is transported, is the machine direction. The exit direction of the outflowing air is ideally neither fully in the machine direction nor in the cross machine direction, but has a first component in the machine direction and a second component perpendicular to the machine direction and perpendicular to the cross machine direction. The flow should be aligned as strongly as possible. A component in the cross-machine direction is particularly detrimental to the production of highly uniform fibers / filaments.

DE 102 58 170 B3 discloses a meltblown introduction which already partly solves the above-mentioned problems. Due to the fact that the nozzle pack is detachably mounted upwards, only a small amount of space is required to dismantle the device for cleaning. The nozzle package can be easily and quickly removed from the machine. The dismantling or cleaning of the nozzle package can then be done at a designated workplace. In the direction of the air gap, there is less space next to the machine needed. The guidance of the process air in terms of exit velocity and direction, however, takes place in a conventional manner.

From EP 0 633 339 A2 a melt blowing device is known in which individual nozzles are surrounded by a circular air jet. In order to produce an annular jet of air, the air supplied via an air line is first introduced into an annular channel and then exits from the subsequent annular gap. Through the annular channel is not a homogenization of the air coming from several lines generated, but only a distribution of air from a line in an annular gap.

It is therefore an object of the present invention to uniform the process air in the region of the exit of the filaments from the spinnerets and to allow the exit direction essentially transversely to the machine direction, whereby the device should nevertheless be easy to clean.

The object is achieved with a melt blowing device and a method according to the independent claims.

In a meltblowing apparatus according to the invention, the process air is transported from two sides to a row of nozzle holes of a spinneret, where it draws the polymer melt leaving the nozzle holes. The air must be evenly distributed over the width of the system to achieve uniform melt or filament stretching. In addition, the flow directions of the two air streams should complement each other so that ultimately only one directional component remains in the conveying direction of the filaments. It is therefore important that each individual air flow has no directional component in the cross-machine direction. The melt blowing device according to the invention has a melt line arranged in a nozzle package, spinnerets and a mouthpiece extending along the device for producing filaments formed from the melt. The melt blowing device is installed in the cross machine direction. Thus, "longitudinal means" means that the mouthpiece extends in the cross-machine direction, and an air supply means is provided, each including an air gap aligned with one side of the mouthpiece, aligned along the mouthpiece and the device, the required air being distributed longitudinally of the air gap The supply channel is connected to the air gap via a multiplicity of lines arranged along the melt blowing device, preferably in rows., If at least one gap-like compensating chamber is provided between the supply channel and the longitudinal air gap, into which a plurality of lines terminate From this exits and this connects with each other, so this causes the process air flows through first through a portion of the lines and then summarized in the compensation chamber and comparatively The process air then re-enters several lines and finally reaches the air gap very evenly with regard to flow velocity, direction and pressure. Last non-uniformities are still compensated in the air gap, so that the process air exits the air gap with a very high uniformity over the entire length of the melt blowing device towards the filaments. The compensation chamber also causes the path which the process air has to travel from the supply channel to the exit from the air gap to be extended. As a result, a homogenization of the process air is also achieved.

A homogenization of the process air also takes place in that first air lines open into second air lines and the air lines have different cross-sectional areas. Thus, air ducts lead into air ducts and not into a compensation chamber. The air ducts have in Compared to a compensation chamber a clear guidance of the flow. They are, for example, holes or channels. The process air is thereby gradually diverted and assumes the new flow direction. It also calms its flow and finally flows around the filaments in a very effective and calm manner. The filaments are stretched very well without them touching and clumping together.

If the first and the second air ducts bores of different diameters, which open into each other, so a gradual homogenization is advantageously effected without generating turbulence.

If one or more first air ducts enter into a different number of second air ducts, a particularly advantageous production of the air ducts of different cross sections is made possible.

If the sum of the cross-sectional areas of the first air line (s) is different or equal to the sum of the cross sections of the second air line (s), it is possible, for example, to influence the flow velocity depending on the existing structural conditions and the intended effects on the process air flow. The sum of the cross-sectional areas of the first air line (s) is preferably greater than the sum of the cross-sections of the second air line (s) in order to slowly increase the air speed by reducing the cross-sectional areas in the direction of flow.

The task of uniforming the process air at the exit from the air gap in the area of filament formation is also achieved in that the melt line and the air supply device are each arranged partly in the nozzle package and a machine beam included in the supply channel. If the melt line and / or the air supply device are detachably connected to one another via the underside of the nozzle package or the upper side of the machine beam, then the Extends the path to be traveled over, which makes the process air in their speed, direction and pressure equalized. On the other hand, the melt blowing device is quick and easy to clean because the corresponding interfaces of the melt line and the air supply device are easy to reach. The nozzle package is removed from the stationary machine beam by appropriate lifting devices and can be easily cleaned at a corresponding workplace. The stationary machine beam is in turn easily accessible from above and can also be easily maintained. Through this innovative embodiment, both a uniform process air supply is achieved as well as the possibility of a quick and easy cleaning of the nozzle assembly and the separation points of the melt line and air supply causes. The mouths of the melt line and / or the air supply to the bottom of the nozzle package or the top of the machine beam are particularly easy to access. This design cleans the melt supply system each time the nozzle bar, ie the mouth of the melt line, is cleaned. This determines the cleaning interval. This is always to be expected with an optimal function of this part of the melt supply system.

It is also particularly advantageous if in the embodiment in which the compensation chamber is provided for the air supply, the air is supplied via the supply channel, which is arranged in a stationary machine beam. The supply channel and the associated lines in the compensation chamber are fixedly arranged in the melt blowing device and offer the possibility of a defined connection of the other air supply to the supply channel. The machine beam can serve for the storage of the nozzle pact and at the same time form defined connection points for the air supply device and optionally the melt lines. If the gap-like compensation chamber in the flow direction of the process air is several times longer than high, a uniform propagation of the process air in the compensation chamber is effected.

If the gap-like compensation chamber is designed substantially without flow obstacles, in particular without a flow labyrinth, turbulences are largely avoided and the process air is evenly balanced in the chamber and directed into the subsequent air lines.

Preferably, a first series of conduits is disposed between the supply passage and the compensation chamber and a second series of conduits is disposed between the compensation chamber and the air gap. This means that the compensation chamber connects on the one hand two rows of lines and on the other hand, the lines of a row together. The process air thereby flows from the supply channel first through relatively narrow lines, then enters the compensation chamber and then flows out of the compensation chamber again into a second row of lines. Already hereby a significant pressure and speed compensation of the process air is achieved, so that in the second row of lines already a very uniform flow over the entire length of the melt blown device is achieved.

In order to achieve an even better homogenization, it is preferably provided that at least one row of lines opens into the other row of lines with a different cross section, preferably into a smaller cross section. Preferably, the cross-sectional changes of the air ducts in the flow direction from large to small. For example, if the lines are holes, the diameter of the second row may be about twice the diameter of the third row of holes. As a result, a further equalization of the pressures and speeds is achieved. In addition, a velocity component in the cross machine direction becomes off taken out of the flow of the process air, so that finally at the exit from the air gap in the region of the filaments, the air flow preferably has no velocity component in the cross-machine direction more. The filaments are flowed through by the interaction of the opposing air gaps in their conveying direction, so that the air flow causes a very effective stretching of the still fresh filaments. The velocity components present at the exit from the air gap cooperate with the further air gap arranged opposite the orifice so that the filaments are not entangled with one another. The air supply device according to the invention thus continues to cause the process air, which still has a velocity component essentially completely in the cross-machine direction in the supply channel, to be deflected so that this velocity component is taken out of the process air and thus an optimum stretching of the filaments is effected. This is particularly advantageous if the supply channel is directed along the cross-machine direction and supplied with process air in the region of at least one of the end sides of the machine.

It is particularly advantageous if the supply channel and the first row of lines are arranged in the stationary machine beam. As a result, a very simple production of the supply channel and the first row of lines is possible.

For the cleaning of the nozzle pack, it is advantageous if the nozzle pack is removable from the stationary machine beam. It is particularly advantageous here if the nozzle package can be lifted in the vertical direction of the machine beam. But it is also possible that the nozzle pack is pushed in the cross machine direction on the stationary machine beam, but more space is needed here. Advantageously, at least parts of the compensation chamber and / or the second and / or optionally further rows of lines are arranged in the nozzle package. By the division of the compensation chamber and the lines, whereby portions in the nozzle package and portions thereof are arranged in the machine beam, the production as well as the cleaning is facilitated.

If the compensation chamber is arranged above the supply channel, then the process air guide is such that the process air has a relatively long distance to travel and thus also leads to a homogenization of speed, pressure and direction, without the space of the melt blown device is significantly increased. It is thereby achieved a compact design.

In order to facilitate the production of the compensation chamber and / or lines, it is advantageous if the compensation chamber and / or lines are partially bounded by the machine beam and partially by the nozzle package. Outer surfaces of the machine beam and the nozzle pack are easy to machine and, when the nozzle pack and machine beams are brought together, form the compensation chamber and / or lines.

In order to bring about a homogenization of the air, it is advantageous if an overflow strip is arranged in the compensation chamber. Particularly advantageous has a trapezoidal overflow proved, which is easy to manufacture and on the other hand, the process air in the desired manner over the length of the compensation chamber and thus the machine length made uniform. Other forms are also possible. For example, in turn, a number of lines could be incorporated into the overflow bar. Furthermore, could also be a desired asymmetry or nonuniformity in the cross-machine direction, for example, to compensate for effects of unilateral air inflow, especially in wider installations.

It may also be advantageous if compensation channels are provided between which a row of lines lies. This can be arranged, for example, in a former compensation room. That would be an extension part that can be used in machines with particularly high demands on the air uniformity. For that could possibly fall away the other rows.

It is also particularly advantageous under the aspect of equalizing the process air if the air gap is wound in a cross-section. The process air is deflected several times within the air gap. It has been found that even this way a homogenization of the process air is achieved. This is caused on the one hand by the deflections per se and by the extended flow path.

If at least one bead, preferably in the region of a deflection, is arranged in the cross section of the air gap, then the process air is also influenced in such a way that it emerges uniformly from the mouth of the air gap and uniformly stretches and cools the filaments.

In order to allow an adjustment of the cross section of the air gap and also to be able to produce this easily, it is advantageous if a gap plate is used, which limits the air gap. The position of the gap plate is preferably adjustable by spacers, so that the size of the air gap is variable.

In order to produce a desired temperature of the process air at the exit from the air gap, it is advantageous if heating elements are arranged on the machine beam and / or the nozzle package. The process air is thereby kept at the desired temperature, even if it has been promoted over a relatively long machine length.

Preferably, the machine beam is arranged on both sides of the nozzle package. The nozzle package can thereby be stably and evenly stored on the machine beam.

Preferably, the two machine beams are connected to each other frontally. This results in a stable construction. In addition, the supply of the process air into the arranged in the machine beam supply channels is particularly easy to perform.

If the nozzle package T-shaped formed with a transverse and a longitudinal ridge and the melt line and the air supply on the underside of the cross bar or the top of the machine beam separably connected, so is a cheap production, cleaning and connection of the melt line and air supply to achieve. In addition, a compact and stable construction is thereby obtained, which takes up little space for the meltblowing device.

It is particularly advantageous if the nozzle package and the machine beam are separably connected to each other in the area of the compensation chamber. Both the introduction of the process air in the compensation chamber and the production and sealing can be carried out very easily.

In order to achieve a uniform supply of the melt to the spinnerets and the mouthpiece, it is particularly advantageous if the melt line, preferably in the nozzle pack or else in the machine beam or the supply line in front, is hydraulically split. This means that the melt line is branched in the nozzle package and opens into at least two ends. As a result, the melt is distributed uniformly over the entire length of the machine, thereby producing uniform fi lament. mente. In order to limit in width the manifolds often attached at the end of each melt line, the melt lines are split - just that hydraulic gap. In principle, the melt lines could already be divided in the beam or several melt lines could be led into the beam. But then the hydraulic pressure is in the non-expandable part of the melt distribution system. The cleaning is thus much more difficult.

If the ends of the melt line are triangular in shape, in particular formed with rectilinear, curved or wavy side walls, a particularly good and uniform distribution of the melt is achieved via the mouth.

If a gap is provided laterally between the nozzle pack and the machine beam, the assembly and disassembly is facilitated. In addition, thermal expansion, which occur during operation of the device, not a hindrance to disassembly of the nozzle package.

In order to achieve a quick cleaning of the nozzle package and also to have to carry the process air without obstructive and unwanted obstacles, the components of the nozzle package are preferably clamped or screwed from the outside of the nozzle package. The assembly and disassembly of the nozzle package is thereby facilitated and the guidance of the melt and process air is not hindered. The air gap is preferably free of the air flow disturbing gaps, depressions and / or elevations. It is particularly important that in the area of the air gap no disturbing depressions in the surface of the air gap resulting components for receiving screws, etc. are present. Also not preferred are cover strips, which cover these wells in turn, because they now again create gaps and transition points that can lead to disturbances in the flow. If a displacement body is arranged in the supply channel, which increases in volume, for example in the course of the supply channel, then a volume compensation takes place, which compensates for the air previously discharged through the lines. Thus, advantageously, the pressure and the flow velocity of the air can be largely maintained.

An inventive method for supplying process air in a melt blown from a supply channel to an air gap is such that for the uniform outflow of air flow from the air gap, a pressure and flow compensation is performed by the air flow is repeatedly separated and reunited. The process air can thereby calm down and flows out of the air gap in the direction of the filaments evenly and in particular without significant directional component in the cross-machine direction. As a result, a uniform and directed in the direction of production of the filaments process air flow is generated, which has no negative fluctuations over the machine length away. It is thereby possible to introduce the process air on one side of the machine and to let it flow uniformly over the entire length of the machine in the direction of filament delivery, without finally having a large directional component in the cross-machine direction. The air duct system may be symmetrical or not symmetrical.

Preferably, the air flow in lines, in particular holes separated and merged into chambers again.

In order to achieve a particularly good homogenization of the process air flow, the air flow is further separated by successive lines or bores. As a result, a particularly good alignment of the air flow in the desired direction, in particular in the longitudinal direction of the lines is preferably achieved. If the air flow is brought together further by successive chambers, a homogenization of the process air flow is to be achieved, which can be aligned again with subsequent lines.

It is of course of particular advantage if the lines which influence the direction of the process air flow are aligned transversely to the machine transverse direction in which the process air is supplied in the supply channel, ie with directional components in the machine direction. Since the process air is to be deflected by 90 degrees in order to be able to flow on the one hand in the cross machine direction and on the other hand essentially in the direction in which the filaments are produced to flow, this deflection is 90 degrees through the correspondingly arranged lines and the To achieve compensation chambers particularly advantageous.

Further advantages of the invention are described in the following exemplary embodiments. It shows:

1 shows a section through a perspective view of a melt blown device according to the invention in the closed state and

Figure 2 is a perspective view of the process air duct.

FIG. 1 shows a section through a perspective view of a melt blowing device. The arrow labeled x indicates the machine direction and the arrow labeled y indicates the machine transverse direction. In the z direction, the filament is produced. The melt blowing device 1 consists of a nozzle package 2 and two machine beams 3 arranged laterally of the nozzle pact 2. In the machine beam 3, in each case a supply channel 4 is arranged, through which the process air is fed over the length of the machine. On the supply channel 4 are a plurality of lines 5, in the present embodiment, these holes are arranged, which are directed upwards, to the edge of the machine beam 3 and open there. Each of the holes 5 opens in the embodiment of the left supply channel 4 in two more lines or holes 8, which each have a much smaller cross section than the holes 5. These additional, smaller holes 8 align the process air continues and cause a deflection the process air and a homogenization of the flow direction, speed and pressure is effected. The row of smaller holes 8 finally opens into a compensation chamber 6 in the nozzle package 2. In the embodiment of the right supply channel 4, the lines 5 open directly into the compensation chamber. 6

The compensation chamber 6 covers a plurality of bores 5 and 8, respectively, so that the process air from these multiple bores 5 or 8 can flow into the compensation chamber 6. A part of the wall of the compensation chamber 6 is formed by the machine beam 3 and the other part of the compensation chamber 6 through the nozzle package 2.

At, seen in the machine direction x, the other end of the compensation chamber 6, in turn, a second row of lines or holes 7 in the nozzle package 2 is arranged. The holes 7 are directed downwards and cause the process air is increasingly aligned in the machine direction and in the horizontal z-direction.

The holes 7 open into an air gap 9, which is angled so that it ends immediately before the area in which filaments have been produced. The process air stream, which is now oriented in the xz direction and flows uniformly over the entire cross machine direction y, stretches the filaments and cools them equally over the entire machine. nenlänge. As a result, uniform filaments are achieved, which are particularly high quality.

To be able to influence the process air flow even better during its path from the supply channel 4 to the mouth of the air gap 9, various further elements are provided. This is a trapezoidal overflow bar 12 at the inlet of the process air into the compensation chamber 6. In addition, a bead 13 is provided at the inlet within the air gap 9. These elements provide a calming effect on the airflow to be evened out across the machine length.

The air gap 9 is formed by the interaction of a gap plate 14 and a mouth piece 15. Two opposing mouthpieces 15 form a mouthpiece of the melt blowing device 1, from which the filaments emerge. The size of the air gap 9 is influenced by the position of the gap plate 14 and the mouthpiece 15. This position can be influenced by spacers, which are placed in the assembly of the gap plate 14 and / or the mouthpiece 15 with respect to the main body of the nozzle package 2 and thus increase or decrease the air gap 9. Slit plate 14 and mouthpiece 15 are each screwed from the outside of the main body of the nozzle pack 2, so that the process air flow is not hindered. It is advisable to screw the gap plate 14 laterally and the mouthpiece 15 from above.

The mouthpiece 15 delimits a melt line 17. Through the melt line 17, the molten polymer is pressed through the machine bar 3 and the nozzle pack 2 and finally forms filaments in a multiplicity of fine openings which emerge from below the mouthpiece 15. The melt line 17 is angled several times within the nozzle package 12, so that the melt is supplied on the one hand vertically to the mouthpiece 15 and also over the length of ge of the meltblown device is evenly distributed. The melt is thereby hydraulically split and evenly distributed by the triangular-like shape of the melt line 17. The shape can be triangular, as shown; but there are also other forms possible, such as arcuate or curved. There may be several branches of the melt line. The branches can, as shown here, be arranged in the nozzle package 2. But you can also be in the machine bar 3 or outside of the device shown.

The nozzle package 2 is T-shaped. At the bottom of the crosspiece of the T-shaped nozzle package 2 are the interfaces of the melt line

17 and the air supply between holes 5 and compensation chamber 6 is arranged. If the melt-blowing device 1 is opened for cleaning, the nozzle package 2 is lifted vertically upward from the machine bar 3. The interfaces, which are then exposed, can be easily cleaned in this way.

In order to be able to convey the process air into the air gap 12 at the same temperature over the entire machine length, heating elements are used

18 arranged in the cross machine direction along the machine beam 3 and the supply channels 4.

Between the nozzle pack 2 and the machine beam 3 columns 19 are provided. As a result, temperature expansions of the machine beam 3 and the nozzle package 2 are compensated without disassembly or lifting of the nozzle package 2 would be hindered by the machine beam 3 even when heated melt blown 1. For accurate positioning of the nozzle package 2 on the machine beam 3 only small guides are provided here. In the right supply channel 4, a displacement body 20 is indicated. With increasing length of the supply channel 4, starting from the feed of the process air into the supply channel 4, the volume of the displacement body 20 increases and thus reduces the free volume of the supply channel 4. This compensates for the previously removed air volume from the supply channel 4. The displacement body 20 may be, for example, a wedge.

A heater 21 is also disposed on the nozzle pack 2. This can be removed from the machine bar 3 together with the nozzle package. But it is also possible that the heater 21 is arranged on the machine beam 3 and acts in the direction of the nozzle pack 2. The removal of the nozzle pack 2 from the machine beam 3 is thereby made easier. Of course, the heater 21 may also be arranged at locations other than the illustrated locations of the nozzle package 2.

Figure 2 shows the course of an air supply device of another embodiment of the invention in perspective sketch. The process air flows according to the arrow in the cross machine direction through the supply channel 4. From the supply channel 4 projects a first row with a plurality of lines 5, which open into the compensation chamber 6. The compensation chamber 6 connects several of the lines 5 as well as several of the lines 8 at the output of the compensation chamber 6 with each other. The process air is accordingly first channeled in the lines 5, then it mixes with process air from other lines 5 in the compensation chamber 6 and is then channeled again in the lines 8. The lines 8, which have a relatively small cross section, are then again partially combined in the third row with lines 7. In the present exemplary embodiment, contrary to the embodiment according to FIG. 1, two of the lines 8 each open into a line 7. Thus, after a fine sewerage of the process air, a new summary takes place in the lines 7. The multitude of gen 7 of the third row finally opens into the air gap 9, which connects according to the compensation chamber 6, the plurality of lines 7 together.

The air gap 9 is wound or angled, i. E. it has deflections and tapers towards the mouth of the air gap. The process air is thus directed very accurately when it emerges from the air gap 9 in accordance with the direction of the arrow. The process air was thus deflected in the air supply device by 90 degrees, starting from the direction in the machine transverse direction y to finally in the machine direction x with a component in the direction z. In the ideal case, a directional component in the machine transverse direction y no longer has the process air on leaving the air gap. This ensures that the process air flows around the filaments evenly, without it providing for an undue turbulence of the filaments and thus damage to the filaments.

The present invention is not limited to the illustrated embodiments. Of course, other embodiments within the scope of the claims are possible. For example, the melt supply also on both sides, ie z. B. via both machine beams 3 done. Also, more or less of the three illustrated rows of conduits of the air supply means may be provided. The division of the lines in modified cross sections can be done in the flow direction before, but also after the compensation chamber. It is a change towards smaller cross sections, but also possible to larger cross sections. The supply channel may also have other than the illustrated cross sections.

Claims

Patent claims

A meltblowing apparatus comprising a melt line (17) arranged in a nozzle package (2), spinnerets and a mouthpiece extending along the device for producing filaments formed from a melt and having an air supply means each associated with one side of the mouthpiece along the mouthpiece and the device-oriented air gap (9), wherein the required process air via a in the longitudinal direction of the air gap (9) extending supply channel (4) is supplied to the air gap (9) and the supply channel (4) via a plurality of arranged along the melt blown air ducts is connected to the air gap (9), characterized in that between the supply channel (4) and the longitudinal air gap (9) at least one gap-like compensating chamber (6) is provided, in which a plurality of air lines (5, 7, 8) open and emerge from this and connects them together.

2. meltblowing device with a melt line (17) arranged in a nozzle package (2), spinnerets and a mouthpiece for producing filaments formed from a melt and with an air supply device, each having an air gap (9) associated with one side of the mouthpiece and aligned along the mouthpiece ), wherein the required process air via a in the direction of the air gap (9) extending supply channel (4) the longitudinal air gap (9) can be supplied and the supply channel (4) via a plurality of preferably arranged in rows air ducts with the air gap (9) is connected, characterized in that first Air lines (5; 8) in the second air lines (8; 7) open and the air lines (5, 8; 8, 7) have different cross-sectional areas.

3. melt blowing device according to the preceding claim, characterized in that the first and the second air lines (5, 7, 8) holes of different diameters, which open into one another.

4. melt blowing device according to one or more of the preceding claims, characterized in that one or more first air line / s (5; 8) in a different number of second air line / s (8; 7) opens.

5. melt blowing device according to one or more of the preceding claims, characterized in that the sum of the cross-sectional areas of the first air line / s (5; 8) is different or equal to the sum of the cross sections of the second air line / s (8; 7).

6. meltblowing device with a melt line arranged in a nozzle package (2), spinnerets and a mouthpiece for producing filaments formed from a melt and with an air supply device each including an air gap (9) associated with one side of the mouthpiece and aligned along the mouthpiece, wherein the required process air via a in the direction of the air gap (9) extending and in a stationary machine beam (3) arranged supply channel (4) the air gap (9) can be supplied and the supply channel (4) via a plurality of preferably arranged in rows air ducts the air gap (9) is connected, in particular according to the preceding claims, characterized in that the melt line (17) and the air supply means each partially in the nozzle pack (2) and the machine beam (3) are arranged and open at the bottom of the nozzle assembly (2) or the top of the machine beam (3) and are detachably connected together.

7. melt blowing device according to one or more of the preceding claims, characterized in that the supply channel (4) in a stationary machine beam (3) is arranged.

8. melt blowing device according to one or more of the preceding claims, characterized in that the gap-like compensation chamber (6) in the flow direction of the process air is a multiple longer than high.

9. melt blowing device according to one or more of the preceding claims, characterized in that the gap-like compensation chamber (6) substantially without flow obstacles, in particular without a flow labyrinth, is formed.

10. melt blowing device according to one or more of the preceding claims, characterized in that a first series of air lines (5) between the supply channel (4) and the compensation chamber (6) and a second series of air lines (7) between the compensation chamber (6) and the air gap (9) is arranged.

11. melt blowing device according to one or more of the preceding claims, characterized in that at least one row of air lines (5; 8) in the other series of air lines (8; 7) opens with a different cross-section.

12. melt blowing device according to one or more of the preceding claims, characterized in that the cross-sectional ments of the air ducts (5, 8) in the direction of flow, preferably from large to small.

13. melt blowing device according to one or more of the preceding claims, characterized in that the supply channel (4) and the first row of air ducts (5) in the stationary machine beam (3) are arranged.

14. melt blowing device according to one or more of the preceding claims, characterized in that the nozzle package (2) from the stationary machine beam (3) is removable.

15. melt blowing device according to one or more of the preceding claims, characterized in that at least parts of the compensation chamber (6) and / or the second and / or optionally further / n series / n of air ducts (7, 8) in the nozzle package (2) are arranged.

16. melt blowing device according to one or more of the preceding claims, characterized in that the compensation chamber (6) above the supply channel (4) is arranged.

17. melt blowing device according to one or more of the preceding claims, characterized in that the compensation chamber (6) and / or lines (5, 7, 8) partially of the machine beam (3) and partially of the nozzle package (2) is limited.

18. melt blowing device according to one or more of the preceding claims, characterized in that in the compensation chamber (6) at least one overflow bar (12) is arranged.

19. melt blowing device according to one or more of the preceding claims, characterized in that the overflow bar (12) is trapezoidal and / or formed with incorporated lines and / or with different cross-section.

20. melt blowing device according to one or more of the preceding claims, characterized in that the air gap (9) is formed wound in cross-section.

21. melt blowing device according to one or more of the preceding claims, characterized in that in the cross section of the air gap (9) at least one bead (13), preferably in the region of a turn, is arranged.

22. melt blowing device according to one or more of the preceding claims, characterized in that the air gap (9) by a gap plate (14) is limited.

23. melt blowing device according to one or more of the preceding claims, characterized in that the position of the gap plate (14) for changing the size of the air gap (9) is adjustable.

24. melt blowing device according to one or more of the preceding claims, characterized in that on the machine beam (3) and / or the nozzle package (2) heating elements (18) are arranged.

25. melt blowing device according to one or more of the preceding claims, characterized in that the machine beam (3) on both sides of the nozzle pack (2) is arranged and the nozzle package (2) superimposed.

26. melt blowing device according to one or more of the preceding claims, characterized in that the two machine beams (3) are connected to each other frontally.

27. melt blowing device according to one or more of the preceding claims, characterized in that the nozzle package (2) is T-shaped with a transverse and a longitudinal ridge and the melt line (17) and the air supply on the underside of the transverse web or the top of the machine beam (3) are separably connected.

28. melt blowing device according to one or more of the preceding claims, characterized in that the nozzle package (2) and machine beam (3) in the region of the compensation chamber (6) are separable.

29. melt blowing device according to one or more of the preceding claims, characterized in that the melt line (17), preferably in the nozzle package (2), is hydraulically splitted and opens into at least two ends.

30. melt blowing device according to one or more of the preceding claims, characterized in that the ends of the melt line (17) triangular, in particular with rectilinear, arcuate or wavy formed side walls are formed.

31. melt blowing device according to one or more of the preceding claims, characterized in that laterally between the nozzle pack (2) and machine beam (3), a gap (19) is provided.

32. meltblowing device according to one or more of the preceding claims, characterized in that the components of the nozzle ketes (2) are preferably clamped or screwed from the outside of the nozzle pack (2).

33. melt blowing device according to one or more of the preceding claims, characterized in that the air gap (9) is free from the air flow disturbing gaps, depressions and / or elevations.

34. melt blowing device according to one or more of the preceding claims, characterized in that in the supply channel (4) a displacement body (20) is arranged.

35. melt blowing device according to one or more of the preceding claims, characterized in that the lines (5, 7, 8), which influence the direction of the process air flow, transversely to the cross-machine direction, in which the process air in the supply channel (4) is delivered, aligned are.

36. A method for supplying process air in a melt blowing device (1) in particular according to one of the preceding claims, from a supply channel (4) to an air gap (9), characterized in that for the uniform outflow of air flow from the air gap (9), a pressure - And flow compensation is performed by the air flow is repeatedly separated and merged again.

37. The method according to the preceding claim, characterized in that the air flow in air lines (5, 7, 8) separated and in chambers (6, 9) is merged.

38. The method according to one or more of the preceding claims, characterized in that the air flow through successive air ducts (7, 8) is further separated.

39. The method according to one or more of the preceding claims, characterized in that the air flow through successive chambers (6, 9) is further merged.