DE102022001897A1 - Meltblowing die device and method for producing a plurality of fiber strands from a polymer melt - Google Patents

Abstract

Melt blowing nozzle device for producing a plurality of fiber strands from a polymer melt, with a pressure measuring device for measuring the pressure of a polymer melt and with a pressure relief device for releasing the pressure of the polymer melt by releasing a melt stream, the pressure relief device for releasing a melt stream of the polymer melt depending on a pressure measured by the pressure measuring device is set up.

Description

The present invention relates to a meltblowing die device for producing a plurality of fiber strands from a polymer melt. The present invention also relates to a method for producing a large number of fiber strands from a polymer melt.

Depending on their design, meltblowing die devices can be susceptible to overpressure. For example, it has been found that single-row meltblown nozzles in particular can be susceptible to overpressure due to their high number of holes and nozzle geometry.

Such excess pressure can have various causes during operation. If the process air heating fails, the capillaries of the meltblown nozzles can freeze. Excessive pressure can also be caused by the viscosity of the respective polymer being too high. Furthermore, an undesirable overpressure can arise if the throughput is set too high. Finally, there is a risk that the polymer in the nozzle body will melt during the heating phase, even though the capillaries are still closed. In such a case, the melt expands and also creates excess pressure.

If the pressure is too high, the respective meltblowing nozzle device or meltblown nozzle can be damaged. This is associated with high costs and long downtime due to long delivery times for meltblown nozzles.

It is known to limit excess pressure in a meltblowing nozzle device or in a meltblown nozzle by means of a bursting plug. For this purpose, a permissible melt pressure is measured directly in front of the nozzle and limited by a bursting plug. Such bursting plugs have a specified release pressure, for example 35 bar. When the triggering pressure is reached, the respective membranes of the bursting plugs burst and release a pressure-relieving flow of melt. This reduces the load on the system and damage caused by excess pressure can be avoided.

After a melt flow has been released through a bursting plug by bursting of the respective membrane, the bursting plug must be replaced for further operation or the renewed commissioning of the meltblowing nozzle device. This results in high costs.

Furthermore, different materials are processed in the usual way with melt-blowing nozzle devices or passed as melt through the respective nozzles. The process parameters of the different materials can have an influence on the strength of the meltblown nozzle device or the meltblown nozzle. For example, a temperature setting of 240°C for the production of fibers for PP wipes for the meltblowing die device is less critical than the production of fibers for PC filter products at 340°C due to the high-temperature strength. However, the pressure limitation through a bursting plug does not allow the setting of a maximum permissible pressure depending on the type of fiber to be produced or the fiber material to be processed.

Finally, meltblown nozzles with very small capillary diameters are required for the production of very fine fibers. For such meltblown nozzles, the maximum permissible pressures are relatively low and cannot be adequately ensured by bursting plugs. The maximum melt pressure can be limited in such configurations using a melt pressure sensor. When the maximum permissible pressure is reached, the spinning pump can be switched off. However, switching off the spinning pump can only counteract excess pressure due to the polymer's viscosity being too high or the throughput being too high.

Against this background, the object of the present invention was to provide a melt-blowing nozzle device for producing a large number of fiber strands from a polymer melt, with which a high degree of operational flexibility can be guaranteed while at the same time high operational reliability. The task was also to provide a process for producing a large number of fiber strands from a polymer melt.

With regard to the meltblowing nozzle device, this task has been solved by the subject matter of claim 1. A method for producing a large number of fiber strands from a polymer melt is the subject of claim 15. Advantageous embodiments are specified in the dependent claims and are explained below.

A melt blowing nozzle device according to the invention for producing a plurality of fiber strands from a polymer melt has a pressure measuring device for measuring the pressure of a polymer melt and a pressure relief device for relieving the pressure of the polymer melt by releasing a melt stream on. According to the invention, the pressure relief device is set up to release a melt stream of the polymer melt depending on a pressure measured by the pressure measuring device.

Therefore, in a meltblowing nozzle device according to the invention, a pressure measured by the pressure measuring device can be used to initiate a pressure relief by the pressure relief device. By providing a pressure relief device set up in this way, suitable pressure relief can be achieved without changing the operation or intervening in the operation of the respective spinning pump. This ensures a high level of operational safety. In this way, pressure relief can be ensured with only a short time delay from the measurement of an overpressure, in particular regardless of the respective cause of the overpressure. The pressure relief device can preferably be set up exclusively for pressure relief.

At the same time, operational flexibility is increased by a meltblowing nozzle device according to the invention. Different materials with different operating parameters can be advantageously processed. The pressure relief device or its triggering behavior can be adjusted with regard to different operating parameters of the materials to be processed. Such a setting can be carried out in a particularly advantageous manner without having to replace components.

According to an advantageous embodiment, the meltblowing nozzle device can have a nozzle tool with a plurality of capillary passages for extruding fiber strands from a polymer melt. Such a nozzle tool can in particular be a so-called meltblown nozzle or a meltblown spinneret. Capillary passages of such a nozzle tool can be used to produce very fine fiber strands, which are particularly suitable for producing so-called meltblown nonwovens.

Advantageously, a nozzle tool for the production of very fine fibers can have a density of capillary passages of 80 to 120 hpi (holes per inch), preferably of 100 hpi. More preferably, a nozzle tool for the production of very fine fibers can have capillary passages with a capillary diameter dm of 0.05 mm to 0.2 mm, preferably 0.1 mm, and/or capillary passages with a length/diameter ratio L/D of 0.4 to 0.8, preferably 0.6. With such a design, fine fibers can be produced with particularly high reliability.

Likewise, for the production of fibers, it can be advantageous for a nozzle tool to have a density of capillary passages of 40 to 60 hpi (holes per inch), preferably 50 hpi. Furthermore, a nozzle tool for the production of fibers can have capillary passages with a capillary diameter dm of 0.2 mm to 0.5 mm, preferably 0.3 mm, and/or capillary passages with a length/diameter ratio L/D of 8 to 12 , preferably of 10. Such a design is particularly robust and not susceptible to damage.

More preferably, the nozzle tool can be designed as a single-row nozzle tool or with a single-row arrangement of capillary passages, which enables a particularly compact design.

According to a further preferred embodiment, the pressure measuring device for measuring the pressure of a polymer melt can be arranged in the nozzle tool and/or upstream of the capillary passages. In this way, undesirable overpressure in the nozzle tool can be detected with only a short time delay or in the immediate vicinity of any weak points that can be damaged by overpressure.

In a further preferred manner, the pressure relief device can be arranged in and/or on the nozzle tool and/or upstream of the capillary passages. The pressure relief device can even more preferably be designed to relieve pressure by releasing a stream of melt out of the nozzle tool, in particular by releasing a stream of melt out of the nozzle tool. If excess pressure arises in the nozzle tool, which can lead to damage to critical areas of the nozzle tool, such a design or arrangement of the pressure relief device enables rapid and reliable pressure relief.

Particularly preferably, the pressure measuring device can be designed as a pressure sensor, in particular as a melt pressure sensor. Such pressure sensors can be provided at low cost and enable reliable pressure measurement during operation.

The pressure relief device can be designed in a particularly preferred manner for non-destructive pressure relief. The release of the melt flow by the pressure relief device tion can be reversible, in particular reversible without tools and/or without component replacement. With such a design of the pressure relief device, it can continue to operate even after repeated pressure relief processes, whereby complex and cost-intensive removal and installation work as well as new purchases of spare parts can be avoided or limited to a small extent.

The pressure relief device can more preferably be designed as a pressure relief valve, in particular as a needle valve. The pressure relief device can particularly preferably have a valve piston and a drive for actuating the valve piston. The drive can in particular be an electric drive, which drives the valve piston depending on a pressure measured by the pressure measuring device, in particular moves it into an open position and/or closed position. Such a design ensures a high degree of operational safety while at the same time being simple in construction and low in manufacturing costs.

It can also be advantageous if a polymer melt can flow through the pressure relief valve against a closing direction, in particular against a closing direction of the valve piston. In this way, in the event of excess pressure, a particularly quick and safe opening of the pressure relief valve and thus pressure relief can be ensured. In the event of excess pressure to be relieved, the risk of the valve piston becoming blocked in a closed position can be reduced in this way. Such a configuration makes it possible, in particular, for the valve piston to open automatically if the drive fails, thereby releasing a flow of melt. In this way, operational safety is further improved.

According to a preferred embodiment, the pressure relief device can be set up to release a melt flow of the polymer melt when an upper pressure limit value is exceeded. An upper pressure limit can be dimensioned such that damage to the meltblowing nozzle device or the nozzle tool, particularly in the area of the capillary passages, is reliably avoided. At the same time, an upper pressure limit value can be dimensioned in such a way that the pressure relief device is triggered too early and thus unnecessarily frequent operational interruptions are avoided.

An upper pressure limit for releasing a melt flow of the polymer melt through the pressure relief device can in particular be preset and/or changeable. A presetting can, for example, be carried out by the manufacturer and thus ensure safe commissioning of the meltblowing nozzle device. The possibility of changing an upper pressure limit leads to improved flexibility in operation. In particular, an upper pressure limit value can be changed and thus readjusted depending on the respective operating conditions or depending on the polymer material to be processed into fibers.

According to a further preferred embodiment, an upper pressure limit for releasing a melt flow of the polymer melt through the pressure relief device can be preset to a value between 0.5 to 4.0 MPa, preferably between 1.0 to 3.0 MPa, more preferably between 1.0 to 2.0 MPa, even more preferably between 1.2 to 1.8 MPa, even more preferably to a value of about 1.5 MPa. By means of such a preset pressure limit value, trouble-free operation can be ensured on the one hand and at the same time the risk of pressure-related damage to the meltblowing nozzle device or the respective nozzle tool can be avoided.

According to an even further preferred embodiment, the pressure relief device can be set up to block a melt flow of the polymer melt and/or to assume a closed position when the pressure falls below an upper pressure limit. The discharge of a melt stream via the pressure relief device can therefore be stopped or prevented if an upper pressure limit value is or has been fallen below. If permissible operating conditions are adhered to, undesirable discharge or discharge of a melt stream from the meltblowing nozzle device can be avoided and safe operation can be ensured.

According to a further preferred embodiment, the pressure relief device can be set up to release a melt stream of the polymer melt during a start-up period of fiber production. Additionally or alternatively, the pressure relief device can be set up to block a melt flow of the polymer melt after completion of a start-up period of fiber production. In a particularly advantageous manner, the release of a melt stream of the polymer melt during a start-up period of fiber production and/or the blocking of a melt stream of the polymer melt after completion of a start-up period of fiber production can take place independently of a melt pressure measured by the pressure measuring device. In this way production can start be accelerated and at the same time ensure a high level of operational safety.

Even more preferably, the meltblowing nozzle device can have a control and/or regulating device which is set up to control and/or regulate the pressure relief device depending on a pressure measured by the pressure measuring device and/or depending on a signal received by the pressure measuring device. A received signal can be a signal sent by the pressure measuring device. Particularly preferably, such a control and/or regulating device can be designed as a process control system or as part of a process control system. A control and/or regulating device ensures reliable and precise control and/or regulation of the pressure relief device. Ease of use can also be improved by designing the control and/or regulating device as a process control system or as part of a process control system.

According to an even further preferred embodiment, an upper pressure limit value can be stored in the control and/or regulating device and/or can be changed by a user. For example, an upper pressure limit can be manually entered, changed and saved by a user. Likewise, an upper pressure limit can be changed and saved as one of several parameters by defining a production program. A production program can be defined depending on the polymer material to be processed or the type of fiber to be produced.

A further aspect of the present invention relates to a melt blowing nozzle device, in particular according to the above description, with a pressure measuring device for measuring the pressure of a polymer melt and with a pressure relief device for pressure relief of the polymer melt by releasing a melt stream. According to the invention, the pressure relief device can be set up to release a melt flow of the polymer melt during a start-up period of fiber production and / or to block a melt flow of the polymer melt after completion of a start-up period of fiber production.

A still further aspect of the present invention relates to a meltblowing device, in particular for producing a plurality of fiber strands from a polymer melt, with a meltblowing nozzle device according to one of the above aspects and with a spinning pump for conveying a polymer melt and / or with an extruder for extruding a polymer melt.

Such a meltblowing device can in particular be a meltblown device or meltblown system.

Advantageously, the spinning pump of the melt blowing device can be set up to adjust, reduce and/or suspend the delivery of the polymer melt depending on a pressure measured by the pressure measuring device to relieve pressure. In this way, operational flexibility and operational reliability can be further improved.

A yet further aspect of the present invention relates to a method, in particular a meltblowing method, for producing a plurality of fiber strands from a polymer melt, preferably with a meltblowing nozzle device according to one of the above aspects and / or with a meltblowing device described above, in which the pressure of a polymer melt is achieved by means of a pressure measuring device is measured, in which a pressure relief of the polymer melt is carried out by releasing a melt stream depending on a pressure measured by the pressure measuring device and / or in which a pressure relief of the polymer melt is carried out by releasing a melt stream during a start-up period of fiber production.

The preferred embodiments and advantages described above with regard to the melt-blowing nozzle device also apply in the same way to the melt-blowing device and also to the method for producing a large number of fiber strands from a polymer melt.

The present invention has been described above in relation to a meltblowing die device, a meltblowing device and a method for producing a plurality of fiber strands from a polymer melt. However, the present teaching is not limited to this, but also generally relates to a melt spinning nozzle device, a melt spinning device and a melt spinning method.

A further aspect of the present invention therefore relates to a melt spinning nozzle device for producing a plurality of fiber strands from a polymer melt, with a pressure measuring device for measuring the pressure of a polymer melt and with a pressure relief device for pressure relief of the polymer melt by releasing a melt stream, wherein the pressure relief device is set up to release a melt flow of the polymer melt depending on a pressure measured by the pressure measuring device.

A still further aspect of the present invention relates to a melt spinneret device, in particular according to the above description, with a pressure measuring device for measuring the pressure of a polymer melt and with a pressure relief device for pressure relief of the polymer melt by releasing a melt stream. According to the invention, the pressure relief device can be set up to release a melt flow of the polymer melt during a start-up period of fiber production and / or to block a melt flow of the polymer melt after completion of a start-up period of fiber production.

A still further aspect of the present invention relates to a melt spinning device, in particular for producing a plurality of fiber strands from a polymer melt, with a melt spinning nozzle device according to one of the above aspects and with a spinning pump for conveying a polymer melt and / or with an extruder for extruding a polymer melt.

A yet further aspect of the present invention relates to a melt spinning process for producing a plurality of fiber strands from a polymer melt, preferably with a melt spinning nozzle device according to one of the above aspects and / or with a melt spinning device described above, in which the pressure of a polymer melt is measured by means of a pressure measuring device, in which a pressure relief of the polymer melt is carried out by releasing a melt stream as a function of a pressure measured by the pressure measuring device and/or in which a pressure relief of the polymer melt is carried out by releasing a melt stream during a start-up period of fiber production.

The preferred embodiments and advantages described above with regard to the melt-blowing nozzle device, the melt-blowing device and the melt-blowing process also apply in the same way to the melt-spinning nozzle device, the melt-spinning device and also to the melt-spinning process for producing a large number of fiber strands from a polymer melt.

• 1 eine Querschnittdarstellung einer Schmelzblasdüsenvorrichtung gemäß einem Ausführungsbeispiel der Erfindung,
• 2 eine Längsschnittdarstellung einer Schmelzblasdüsenvorrichtung gemäß 1.

The invention is described below by way of example with reference to the attached figures. Show it schematically:

• 1 a cross-sectional view of a meltblowing nozzle device according to an exemplary embodiment of the invention,
• 2 a longitudinal sectional view of a meltblowing nozzle device according to 1 .

1 shows a cross-sectional representation of a meltblowing nozzle device 10 for producing a plurality of fiber strands from a polymer melt according to an embodiment of the invention and 2 shows a longitudinal sectional view of the meltblowing nozzle device 10 according to 1 .

The meltblowing die device 10 has a die tool 12 with a plurality of capillary passages 14 for extruding fiber strands from a polymer melt. The nozzle tool 12 can particularly preferably be a single-row nozzle tool 12, i.e. with a single-row arrangement of capillary passages 14.

Furthermore, the melt blowing nozzle device 10 is equipped with a pressure measuring device 16 for measuring the pressure of a polymer melt and with a pressure relief device 18 for pressure relief of the polymer melt by releasing a melt stream 20. According to the invention, the pressure relief device 18 can be used to release the melt stream 20 of the polymer melt depending on a pressure relief device 16 measured pressure.

The pressure measuring device 18 can preferably be arranged for measuring the pressure of a polymer melt in the nozzle tool 12 and/or upstream of the capillary passages 14. Furthermore, the pressure relief device 18 can be arranged in and/or on the nozzle tool 12 and/or upstream of the capillary passages 14. The pressure relief device 18 can be designed to relieve pressure by releasing the melt stream 20 out of the nozzle tool 12, namely by releasing the melt stream 20 out of the nozzle tool 12.

The pressure measuring device 16 can in particular be designed as a pressure sensor or as a melt pressure sensor.

The pressure relief device 18 can be designed in particular for non-destructive pressure relief. The release of the melt stream 20 by the pressure relief device 18 can preferably be reversible, in particular reversible without tools and/or without component replacement. For this purpose, the pressure relief device 18 can be designed as a pressure relief valve, especially as a needle valve. The pressure relief device 18 can have a valve piston 22 and a drive 24 for actuating the valve piston 22.

In a closed position of the valve piston 22, a flow channel 26 for a melt stream 20 is blocked by it and in an open position of the valve piston 22, the flow channel 26 for the melt stream 20 is released by it. In this case, the pressure relief device 18 designed as a pressure relief valve can be flowed through by a polymer melt counter to a closing direction, in particular counter to a closing direction of the valve piston 22.

The pressure relief device 18 can also be set up to release a melt stream 20 of the polymer melt when an upper pressure limit value is exceeded. Furthermore, the pressure relief device 18 can be set up to block a melt flow 20 of the polymer melt and/or to assume a closed position when the pressure falls below an upper pressure limit.

An upper pressure limit for releasing a melt stream 20 of the polymer melt through the pressure relief device 18 can in particular be preset and/or changeable. Preferably, an upper pressure limit for releasing a melt stream 20 of the polymer melt through the pressure relief device 18 can be preset to a value between 0.5 to 4.0 MPa, preferably between 1.0 to 3.0 MPa, more preferably between 1.0 to 2.0 MPa, even more preferably between 1.2 to 1.8 MPa, even more preferably to a value of about 1.5 MPa.

In a further preferred manner, the pressure relief device 18 can be set up to release a melt stream 20 of the polymer melt during a start-up period of fiber production. Additionally or alternatively, the pressure relief device 18 can be set up to block a melt flow 20 of the polymer melt after completion of a start-up period of fiber production.

The meltblowing nozzle device 10 can also have a control and/or regulating device 28, which is set up to control and/or regulate the pressure relief device 18 depending on a pressure measured by the pressure measuring device 16 and/or depending on a signal received by the pressure measuring device 16. The control and/or regulating device 28 can preferably be designed as a process control system or as part of a process control system. Likewise, the control and/or regulating device 28 can be designed and/or arranged as part of the pressure measuring device 16 or as part of the pressure relief device 18 or as a separate component. An upper pressure limit value can preferably be stored in the control and/or regulating device 28 and/or can be changed by a user.

The pressure measuring device 16 and the pressure relief device 18 can preferably be arranged at opposite longitudinal ends of the meltblowing nozzle device 10 or at opposite longitudinal ends of the nozzle tool 12, as shown 2 can be removed. In the cross-sectional view according to 1 the pressure relief device 18 is shown and the pressure measuring device 16 is arranged at the opposite end of the nozzle tool 12, not shown.

The 1 It can also be seen that the meltblowing nozzle device 10 can be equipped with guide plates 30 which are arranged on an underside of the nozzle tool 12. An air or gas stream can be directed between the guide plates 30 and the underside of the nozzle tool 12, which entrains the fiber strands emerging from the capillaries 14.

In 2 It is also shown that the meltblowing nozzle device 10 can be equipped with a perforated plate 32. The perforated plate 32 can be arranged on an upper side of the nozzle tool 12. Furthermore, a sieve filter 34 can be positioned on the perforated plate 32, through which a polymer melt can be filtered. Finally, the meltblowing nozzle device 10 may have an inlet plate 36 through which a polymer melt can be directed to the nozzle tool 12. The inlet plate 36 can be arranged above the nozzle tool 12. An inlet channel 38 of the inlet plate 36 can lead to the perforated plate 32 with the sieve filter 34 arranged thereon.

The melt-blowing nozzle device 10 is designed in particular to carry out a method for producing a large number of fiber strands from a polymer melt. In such a method, the pressure of a polymer melt is measured by means of the pressure measuring device 16 and a pressure relief of the polymer melt by releasing a melt stream 20 is carried out depending on a pressure measured by the pressure measuring device 16. In such a method, pressure relief can be achieved by a pressure relief device 18.

Through such a method, a pressure measured by the pressure measuring device 16 can be used to initiate pressure relief by the pressure relief device 18. A suitable pressure relief can therefore be achieved without changing the operation or intervening in the operation of a spinning pump. This ensures a high level of operational safety. At the same time, such a process ensures a high degree of operational flexibility. Different materials with different operating parameters can be advantageously processed. The pressure relief device 18 or its triggering behavior can be adjusted with regard to different operating parameters of the materials to be processed. Such a setting can be carried out in a particularly advantageous manner without having to replace components.

Additionally or alternatively, the polymer melt can be relieved of pressure by releasing a melt stream 20 during a start-up period of fiber production. In this way, the start of production can be accelerated and at the same time a high level of operational safety can be guaranteed.

Reference symbol list

10

Meltblowing nozzle device

12

Nozzle tool

14

Capillary passages

16

Pressure measuring device

18

Pressure relief device

20

Melt stream

22

Valve piston

24

drive

26

flow channel

28

Control and/or regulating device

30

Guide plates

32

perforated plate

34

Screen filter

36

Inlet plate

38

inlet channel

Claims (15)

Melt blowing nozzle device (10) for producing a plurality of fiber strands from a polymer melt, with a pressure measuring device (16) for measuring the pressure of a polymer melt and with a pressure relief device (18) for pressure relief of the polymer melt by releasing a melt stream (20), characterized in that the Pressure relief device (18) is set up to release a melt stream (20) of the polymer melt depending on a pressure measured by the pressure measuring device (16). Melt blowing nozzle device (10). Claim 1 , characterized by a nozzle tool (12) with a plurality of capillary passages (14) for extruding fiber strands from a polymer melt, the pressure measuring device (16) preferably for measuring the pressure of a polymer melt in the nozzle tool (12) and / or upstream of the capillary passages ( 14) is arranged. Melt blowing nozzle device (10). Claim 2 , characterized in that the pressure relief device (18) is arranged in and/or on the nozzle tool (12) and/or upstream of the capillary passages (14) and/or for pressure relief by releasing a melt stream (20) out of the nozzle tool (12). is formed, in particular by draining a melt stream (20) out of the nozzle tool (12). Melt blowing nozzle device (10) according to one of the preceding claims, characterized in that the pressure measuring device (16) is designed as a pressure sensor, in particular as a melt pressure sensor. Meltblowing nozzle device (10) according to one of the preceding claims, characterized in that the pressure relief device (18) is designed for non-destructive pressure relief and/or that the release of the melt stream (20) by the pressure relief device (18) is reversible, in particular tool-free and/or free is reversible by replacing components. Meltblowing nozzle device (10) according to one of the preceding claims, characterized in that the pressure relief device (18) is designed as a pressure relief valve, in particular as a needle valve, and / or that the pressure relief device (18) has a valve piston (22) and a drive (24) for actuation of the valve piston (22). Melt blowing nozzle device (10). Claim 6 , characterized in that a polymer melt can flow through the pressure relief valve against a closing direction, in particular against a closing direction of the valve piston (22). Meltblowing nozzle device (10) according to one of the preceding claims, characterized in that the pressure relief device (18) is set up to release a melt stream (20) of the polymer melt when an upper pressure limit value is exceeded. Melt blowing nozzle device (10) according to one of the preceding claims, characterized in that an upper pressure limit for releasing a melt stream (20) of the polymer melt is preset and/or changeable by the pressure relief device (18). Melt blowing nozzle device (10) according to one of the preceding claims, characterized in that an upper pressure limit for releasing a melt stream (20) of the polymer melt through the pressure relief device (18) is preset to a value between 0.5 to 4.0 MPa, preferably between 1 .0 to 3.0 MPa, more preferably between 1.0 to 2.0 MPa, even more preferably between 1.2 to 1.8 MPa, even more preferably to a value of about 1.5 MPa. Meltblowing nozzle device (10) according to one of the preceding claims, characterized in that the pressure relief device (18) is set up to block a melt flow (20) of the polymer melt and/or to assume a closed position when the pressure falls below an upper pressure limit. Meltblowing nozzle device (10) according to one of the preceding claims, characterized in that the pressure relief device (18) is set up to release a melt stream (20) of the polymer melt during a start-up period of fiber production and / or that the pressure relief device (18) is designed to block a melt stream (20 ) of the polymer melt is set up after completion of a start-up period of fiber production. Meltblowing nozzle device (10) according to one of the preceding claims, characterized by a control and/or regulating device (28) which is used to control and/or regulate the pressure relief device (18) depending on a pressure measured by the pressure measuring device (16) and/or in Dependence of a signal received by the pressure measuring device (16), wherein the control and / or regulating device (28) is preferably designed as a process control system or as part of a process control system, and / or that an upper pressure limit in the control and / or regulating device (28) is stored and/or can be changed by a user. Melt blowing nozzle device (10), in particular according to one of the preceding claims, with a pressure measuring device (16) for measuring the pressure of a polymer melt and with a pressure relief device (18) for pressure relief of the polymer melt by releasing a melt stream (20), characterized in that the pressure relief device ( 18) is set up to release a melt stream (20) of the polymer melt during a start-up period of fiber production and / or to block a melt stream (20) of the polymer melt after completion of a start-up period of fiber production. Method for producing a plurality of fiber strands from a polymer melt, in particular with a melt-blowing nozzle device (10) according to one of the preceding claims, - in which the pressure of a polymer melt is measured by means of a pressure measuring device (16) and - in which a pressure relief of the polymer melt is carried out by releasing a melt stream (20) depending on a pressure measured by the pressure measuring device (16) and/or - in which the pressure of the polymer melt is relieved by releasing a melt stream (20) during a start-up period of fiber production.

Images