WO2020002065A1 - Procédé pour la fabrication d'un non-tissé soufflé en fusion et une installation de fusion-soufflage - Google Patents

Procédé pour la fabrication d'un non-tissé soufflé en fusion et une installation de fusion-soufflage Download PDF

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Publication number
WO2020002065A1
WO2020002065A1 PCT/EP2019/066129 EP2019066129W WO2020002065A1 WO 2020002065 A1 WO2020002065 A1 WO 2020002065A1 EP 2019066129 W EP2019066129 W EP 2019066129W WO 2020002065 A1 WO2020002065 A1 WO 2020002065A1
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WO
WIPO (PCT)
Prior art keywords
meltblown
air permeability
air
fleece
tool
Prior art date
Application number
PCT/EP2019/066129
Other languages
German (de)
English (en)
Inventor
Michael Latinski
Original Assignee
Oerlikon Textile Gmbh & Co. Kg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Oerlikon Textile Gmbh & Co. Kg filed Critical Oerlikon Textile Gmbh & Co. Kg
Priority to DE112019003186.4T priority Critical patent/DE112019003186A5/de
Priority to CN201980043337.1A priority patent/CN112368437A/zh
Publication of WO2020002065A1 publication Critical patent/WO2020002065A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/02—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments
    • D04H3/03—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments at random
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/08—Melt spinning methods
    • D01D5/098—Melt spinning methods with simultaneous stretching
    • D01D5/0985—Melt spinning methods with simultaneous stretching by means of a flowing gas (e.g. melt-blowing)

Definitions

  • the invention relates to a method for producing a meltblown nonwoven according to the preamble of claim 1 and a meltblown system according to the preamble of claim 8.
  • meltblown systems for producing meltblown nonwovens are well known in the prior art. Such a meltblown system is described, for example, in DE102016001921 A1.
  • a meltblown system a molten synthetic polymer is fed to a tool under pressure by means of a melt pump.
  • the molten polymer is produced by means of an extruder, in which a plastic granulate is melted and by means of which the melt is conveyed to the melt pump.
  • the plastic flows through melt lines.
  • a screen changer is usually arranged between the extruder and the melt pump, by means of which impurities are filtered out of the melt.
  • the plastic melt in the tool flows through a nozzle tip, which has a series of nozzle bores through which the polymer is extruded to form a large number of filaments.
  • This large number of filaments forms a filament curtain, which is subjected to hot process air from both sides.
  • the individual filaments are drawn using this process air.
  • This process is also referred to as meltblowing by a person skilled in the art.
  • the process air is fed to the nozzle tip via a process air supply.
  • Corresponding piping systems and flow channels in the tool are used for this.
  • the two flow channels adjacent to the nozzle tip are formed in addition to the nozzle tip itself by two air knives, which are part of the tool.
  • This process air is provided by means of a Compressor to which the process air supply pipes are connected.
  • the large number of filaments is deposited on a wire belt of a wire belt machine to form the meltblown nonwoven.
  • the area between the tool and the screen belt through which the process air and the filaments primarily flow is called free jet or meltblown free jet.
  • This free jet diverges from the tool to the screen belt and thus forms a wedge shape.
  • a suction device such as that described in DE 19913162 CI, for example, is arranged in meltblown systems below the sieve belt in the area of filament storage.
  • so-called secondary air feeds are also known, through which air is conveyed from both sides of the filament curtain to this filament curtain in the space between the tool and the sieve belt.
  • a secondary air blower is provided for this.
  • Many of the components mentioned are equipped with heaters. Melt lines, for example, have fusible line heaters to prevent the melt from cooling.
  • many moving components such as pumps or blowers are equipped with motors to drive them. This control of the motors and heaters takes place with the help of a control device.
  • control device described in DE 102016001921 A1, which can be set without intervention by an operator through algorithms stored in the control device.
  • corresponding recipes are stored in the control device, which include target parameters of the process units of the meltblown system.
  • meltblown nonwoven when operating a meltblown system, only the properties of the meltblown nonwoven to be produced are known, and not the parameters required for the aggregates of the meltblown system. In this respect, these target properties of the meltblown nonwoven can only be achieved by means of a lengthy, iterative process in which the properties ten of the meltblown fleece are repeatedly measured in the laboratory in order to then manually adjust the parameters of the meltblown system in order to get closer to the desired value of the property.
  • the air permeability of the melt blown nonwoven is an important meltblown nonwoven property, although with the known meltblown systems it takes a relatively long time to set the desired value for the air permeability. Furthermore, the success of this setting process and the time required for this is heavily dependent on the specialist knowledge and experience of the respective operator of the meltblown system.
  • This object is achieved by a generic method in that an air permeability of the meltblown fleece is measured by means of an air permeability sensor arranged below or above the passing meltblown fleece and by means of a control device by automatically adapting the process air and / or the suction flow a setpoint for the air permeability of the meltblown nonwoven is achieved by means of the screen belt and / or a distance between the tool and the screen belt.
  • the invention was also not suggested by the publication of DE4312309 C2.
  • the system for producing nonwovens shown here only serves to produce a nonwoven that is uniform over its width with respect to its air permeability.
  • the setting parameters of the local nozzle plate temperatures and the local outlet gap thickness of the process air described here are not suitable for influencing the absolute value of the air permeability. However, it is precisely the aim of the invention to set this automatically.
  • the device from DE4312309 C2 does not provide for changing the distance between the tool and the sieve belt. However, this represents an important possibility for adapting the air permeability.
  • the air permeability of the meltblown nonwoven is determined via the pressure or mass flow of an airflow generated by the meltblown nonwoven. This air flow is generated and the pressure or mass flow is measured by means of the air permeability sensor. This enables precise measurement of air permeability during production. The accuracy of the control depends on the accuracy of the air permeability sensor and is therefore very good.
  • Another embodiment of the invention increases the safety when operating the meltblown system.
  • a fleece tear is detected by means of the air permeability sensor in order to operate the meltblown system automatically in a protection mode as a result. If the measured values of the air permeability sensor are abruptly increased to very high values, a fleece tear is assumed.
  • the protection mode is designed in such a way that no damage occurs to both machine operators and the machine itself.
  • the production volume is also throttled so that as little scrap as possible is produced.
  • a message is output by means of a control device. This message includes suggestions on how to deal with the situation.
  • a fiber flight adjacent to the meltblown free jet is monitored by means of a fiber flight monitoring device.
  • a fiber fly arises under unfavorable production conditions and leads to contamination of the surroundings of the meltblown system as well as to poor properties of the meltblown fleece.
  • Fiber fly occurs when individual filaments in the meltblown free jet tear undesirably. This creates filaments of very short catches, which either fly into the vicinity of the meltblown system and contaminate them and / or which are nevertheless deposited into the meltblown fleece, but which therefore lead to a deterioration in its properties.
  • the personnel expenditure for checking the meltblown system can be reduced.
  • excessive fiber fly must be recognized by a machine operator, which is still faulty and imprecise. Especially when different people operate the meltblown system, fiber flight monitoring is carried out according to different criteria.
  • a message is advantageously output by the control device, so that measures for reducing the fiber flight can be taken directly.
  • the machine operator does not have to be on site, ie adjacent to the meltblown free jet, and can deal with other topics. Due to the notification and subsequent adjustment of the machine parameters, contamination of the hall in which the meltblown system is installed and the production of inferior meltblown nonwovens are avoided.
  • the fiber flight monitoring device is integrated in the control of the meltblown system. At least one setting parameter of the meltblown system is changed in such a way that the fiber flight is minimal. An optimization process with regard to fiber flight is therefore carried out, which results in a minimization of the contamination of the hall by fibers and an improvement in the product properties.
  • the object is also achieved by a generic meltblown system according to claim 8, in that an air permeability sensor is arranged below or above the passing meltblown fleece and in that the air permeability sensor is connected to the control device.
  • a control algorithm is advantageously stored in the control device, by means of which a setpoint value for the air permeability of the meltblown fleece can be achieved by automatically adapting the process air and / or the suction flow through the screen belt and / or a distance between the tool and the screen belt.
  • air permeability is often a decisive parameter in the manufacture of luminescent meltblown fleece. This air permeability can be achieved automatically in a very short time without high personnel expenditure. Overall, this increases the productivity of the meltblown system and minimizes waste when starting the meltblown system and when changing products.
  • the air permeability sensor is advantageously arranged in an area in which the meltblown fleece can be guided contactlessly between two guide rollers. There are no other components such as a sieve belt that negatively affect the accuracy of the measurement result of the air permeability sensor. As a result, the meltblown fleece can be adjusted very precisely to the desired air permeability value.
  • a fiber flight monitoring device is arranged adjacent to the meltblown free jet.
  • a camera is part of this monitoring device. In this way, filaments that are too short due to unfavorable process conditions can be recognized without a machine operator himself checking the meltblown free jet. In contrast to manual monitoring, such machine monitoring is significantly more precise and also reproducible.
  • the camera used is a simple and inexpensive way to carry out this monitoring of the fiber flight optically.
  • the camera and a black reference are arranged on opposite sides of the screen belt.
  • the camera is aligned perpendicular to the meltblown free jet.
  • the black reference creates a uniform background for the optical evaluation of the fiber flight, which improves the accuracy and reproducibility of this evaluation. Furthermore, a The highest possible color contrast was created, which further improves the properties just mentioned.
  • the filaments mostly have a white color, the black reference, as the name suggests, is colored black.
  • the camera is oriented towards the sieve belt in the direction of gathering of the filaments or parallel to the meltblown free jet.
  • the camera could be arranged on the tool or on a secondary air supply.
  • the black reference can thus be dispensed with, but this entails losses in terms of the accuracy of the evaluation of the fiber flight.
  • such a positioning of the camera on the tool has advantages with regard to the operation of the meltblown system, since it hardly disturbs it. There is also a slight risk of contamination of the fin of the camera, since the direction of movement of the filaments leads away from this fin.
  • meltblown fleece for filter application, it is possible, in particular a meltblown fleece for filter application, to be used particularly efficiently, i.e. to stand with little waste when adjusting the product properties. Furthermore, the air permeability of the meltblown fleece, which is important for use as a filter, is very constant and precisely adjustable.
  • Fig.l schematically shows a front view of a first embodiment of the meltblown system according to the invention
  • FIG. 3 schematically shows a side view of a second exemplary embodiment of the meltblown system according to the invention
  • FIG. 4 shows a structure diagram of an algorithm for the automatic setting of the air permeability
  • FIG. 1 shows a front
  • Fig. 2 shows a side view.
  • a machine frame 4 serves to hold the units of the meltblown system.
  • An extruder 6 and a melt pump 9 are arranged on the extruder level 5.
  • An outlet of the extruder 6 is connected to an inlet of the tool 11 via a melt line 8.
  • the extruder 6, the melt line 8 and the tool 11 are designed to be heated. For the sake of clarity, the heaters necessary for this are not shown.
  • the extruder 6 has an extruder motor 7 for driving it.
  • a synthetic polymer or a plastic is usually fed to the extruder 6 in the form of granules.
  • polypropylene, polyethylene, polybutylene terephthalate or polyethylene terephthalate are used as synthetic polymers. These can be used in pure form or with the addition of additives become.
  • the polymer is melted within the extruder 6 and conveyed to an outlet of the extruder 6, at which it is in the molten form.
  • an extruder screw rotates within an extruder cylinder and is driven by the extruder motor 7.
  • the plastic melt flows from the extruder 6 through the melt line 8 to the tool 11.
  • the plastic melt flows through a melt pump 9.
  • the melt pump 9 is driven by means of a melt pump motor 10 and is designed, for example, as a gear pump. It serves to even out and increase the pressure with which the plastic melt flows through the tool 11.
  • Extruder 6, melt line 8, melt pump 9 and tool 11 are collectively called melt-carrying components.
  • the selection and combination of these melt-carrying components shown here is exemplary and could also be designed differently in the sense of the invention.
  • the heaters of the melt-carrying components serve to ensure that the plastic melt flows through these components under conditions that are as constant as possible. This counteracts in particular heat loss from the plastic melt.
  • the tool 11 has a two-part basic tool body.
  • a nozzle tip 12 is arranged at its lower end. Recesses are machined into both halves of the main tool body, which form a channel through which the plastic melt flows from an inlet at the upper end of the tool 11 to the nozzle tip 12 during operation of the system.
  • the nozzle tip 12 has a series of nozzle bores through which the plastic melt is extruded into a plurality of filaments 2 into the environment below the tool 11. This large number of filaments 2 forms a filament curtain 3.
  • the recesses in the tool 11 are designed in such a way that all nozzle bores are largely evenly flowed through.
  • a process air supply 14 are arranged in the tool 11.
  • Further channels of this process air supply 14 are located outside the tool 11.
  • a process air 18 is guided to the nozzle tip 12 by means of this process air supply 14.
  • the outer contour of the nozzle tip 12 is V-shaped in the region of the nozzle bores, as can be seen in FIG. 2.
  • Process air 20 flows along this V-shaped outer contour from both sides and over the entire width towards the filament curtain 3 in order to stretch the individual filaments 2 in the further flow course.
  • the channels of the process air supply 14 are formed adjacent to the nozzle tip 12 by the nozzle tip 12 itself and by air knives 13 arranged on opposite sides of the channels. There are two air knives 13, one for each side of the nozzle tip 12.
  • Tool heaters are arranged inside the tool 11 in order to temper the tool 11.
  • a sieve belt machine 22 is positioned at ground level below the tool 11.
  • This sieve belt machine 22 consists of several rollers, by means of which a sieve belt 24 is continuously guided past the tool 11.
  • at least one of the rollers can be driven by means of a screen belt machine motor 23.
  • the filaments 2 emerging from the nozzle tip 12 are deposited on the sieve belt 24 to form a meltblown fleece 1, which is moved away from the depositing point by the movement of the sieve belt 24.
  • the sieve belt 24 is designed in such a way that the filaments 2 cannot penetrate it, but that it is still permeable to air.
  • a suction device 26 is arranged adjacent to the screen belt 24.
  • the suction device 26 is located on the side of the screen belt 24 facing away from the filament deposit.
  • the suction device 26 influences the type of deposit of the filaments 2, so that the meltblown fleece 1 assumes the desired properties.
  • the Suction device 26 consists of a space which is only open towards the screen belt 24 and which is further coupled to a suction fan 27. By means of this suction fan 27, a vacuum can be generated within the space of the suction device 26.
  • the suction fan 27 is driven by means of a suction fan motor 28.
  • the suction device 26 could be divided into several rooms, each of which would be connected to a separate suction fan.
  • a compressor 15 is arranged at the beginning of the process air supply 14, by means of which a corresponding air mass flow can be generated.
  • the compressor 15 could, for example, be designed as a screw compressor which can be driven by means of a compressor motor 16.
  • an air heater 17 is arranged between the compressor 15 and the tool 11, through the flow of which the process air 18 is heated.
  • the process air supply 14 has a branch in the flow path in front of the tool 11, so that the supply of the process air 18 from both sides to the filament curtain 3 is possible.
  • a process air temperature sensor and a process air pressure sensor are arranged in the process air supply 14, so that the compressor motor 16 and the air heater 17 can be controlled or regulated by means of the measured values.
  • An important parameter in the production of meltblown nonwovens 1 is the distance between tool 11 and screen belt machine 22, which is also called DCD (die collector distance).
  • DCD die collector distance
  • the extruder level 5, on which the tool 11 is mounted is designed to be height-adjustable, which is symbolized by the adjacent double arrows. The facilities necessary for this are not shown for the sake of clarity.
  • a secondary air supply 19 is arranged between the tool 11 and the sieve belt machine 22.
  • this secondary air supply 19 so-called secondary air is supplied to the filaments 2 forming a filament curtain 3 from both sides over the entire width of the curtain.
  • This secondary air affects the cooling and stretching of the filaments 2.
  • This secondary air is provided by means of a secondary air blower 20.
  • a secondary air blower motor 21 is used to drive the secondary air blower 32.
  • the secondary air blower motor 21 is controlled or regulated with the aid of sensors which are arranged within the secondary air supply 19.
  • the meltblown system can be operated in different operating modes.
  • An operating mode is an operating point of the meltblown system at which all parameters have constant values, both the system components and the fluid flows being considered.
  • a new mode is part of the production modes and is used to automatically achieve a desired air permeability of the meltblown fleece 1.
  • an air permeability sensor 29 is arranged between two guide rollers 37 arranged downstream of the screen belt machine 22.
  • the meltblown fleece 1 thus runs continuously past the air permeability sensor 29.
  • An air flow through the meltblown fleece 1 is generated by means of the air permeability sensor 29.
  • either an overpressure or a negative pressure is generated in the air permeability sensor 29.
  • the air flow generated depends, among other things, on the air permeability of the meltblown fleece 1.
  • the air permeability sensor 29 is connected to the control device 30 for further processing of the measured value of the air permeability.
  • the conversion of the measured value of the pressure or the mass flow into the value of the air permeability takes place either in the air permeability sensor 29 itself or in the control device 30.
  • An algorithm is also stored in the control device 30, by means of which the automatic setting of the air permeability is stored of meltblown fleece 1 is reached.
  • a target value for the air permeability of the meltblown fleece 1 is read. This is entered by a machine operator via the touch display 31.
  • air permeability is shortened using LD.
  • a measurement of the current air permeability is carried out. For example, the value of the air permeability of the meltblown fleece 1 passing by the air permeability sensor 29 is present in the control device 30.
  • the next step is a security question. If the measured value of the air permeability is greater than 5000 l / m2s, no meltblown fleece 1 is assumed to pass the air permeability sensor 29.
  • the fleece is torn off Meltblown system is automatically transferred into the protection mode by means of the control device 30. If the measured value of air permeability is less than 5000 l / m2s, the next question is whether the setpoint has already been reached. If so, the algorithm ends. If the target value has not yet been reached, one or more parameters from the group of process air 18, the suction flow 25 and the distance between tool 11 and sieve belt 24 (DCD) are adjusted. The manner in which this adjustment is carried out is not to be continued here. A large number of methods are known from control engineering in order to change the parameters with regard to reaching the setpoint. The calculated parameters are checked with regard to limit values stored in the control device 30.
  • the limit values are defined with regard to these criteria. If the desired air permeability cannot be achieved due to the limit values, the algorithm is terminated after a corresponding message. This message is transmitted via the touch display 31. If the limit values have not yet been reached, a new measurement of the air permeability is carried out with changed process parameters. This happens after a certain time, so that the meltblown fleece 1 has adapted to the changed parameters with its air permeability. This closes the control loop and ensures that the desired air permeability is achieved automatically.
  • FIGS. One and two also show a fiber flight monitoring device 34, the function of which is explained below.
  • the fiber flight monitoring device 34 has a camera 35 and a black reference 36.
  • the camera 35 is connected to the control device 30 so that the recorded data can be analyzed and further processed.
  • the camera 35 and the black reference 36 are arranged in such a way that there is the greatest risk in their interspace that fiber flight 32 occurs. This is the case in an area above the sieve belt 24 and adjacent to the meltblown free jet 33. In order to cover this area, the camera 35 is arranged on one side of the filter belt 24 and the black reference 36 on the opposite side.
  • a value for the fiber flight 32 is determined in the control device 30 by means of the recorded images. This value can be used in different ways. For example, a warning can be issued by the control device 30 if the value of the fiber flight 32 exceeds a predetermined limit value.
  • process air 18 could depend on the value of the fiber flight 32.
  • the process air 18 could only be increased up to a permissible value of the fiber flight 32. In this way, a larger process window for the process air 18 can be made possible.
  • the limit value for the process air 18 must be chosen conservatively in order to prevent excessive fiber flight 32 even with unfavorable further process parameters. With favorable process parameters, the fiber flight monitoring device 34 can provide a larger mass flow of the process air 18 without causing excessive fiber flight 32.
  • process air 18 for the other parameters of the meltblown system Overall will taking into account the fact that the fiber flight 32 depends on several parameters. As a result of this limit value formation, the air permeability of the meltblown fleece 1 can assume values which cannot be achieved with the conservative limit values.
  • fiber flight can be integrated into the algorithms for controlling the meltblown system.
  • the process parameters could be automatically optimized for a minimum value of fiber flight 32.
  • Selected process parameters such as the process air 18 and / or the suction flow 25 through the sieve belt 24 and / or the distance between the tool 11 and the sieve belt 24 (DCD) are integrated into optimization algorithms known in the art.
  • FIG. 3 schematically shows a side view of a second exemplary embodiment of the meltblown system according to the invention.
  • the same reference numerals are used as in FIGS. 1 and 2. Since the first and second exemplary embodiments are largely the same, only the differences will be discussed below. The difference lies in the design of the fiber flight monitoring device 34. A black reference is dispensed with in this exemplary embodiment.
  • the camera 35 is arranged on a housing of the secondary air supply 19.
  • the camera 35 is aligned parallel to the meltblown free jet 33 and the sieve belt 24.
  • Such an arrangement requires a different type of image evaluation.
  • the camera 35 does not interfere with any operating activities on the sieve belt machine 22.
  • the risk of contamination of the lens of the camera 35 is lower even with this arrangement.
  • other positions of the camera 35 are also possible within the meaning of the invention.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Nonwoven Fabrics (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)

Abstract

L'invention concerne un procédé et un dispositif correspondant pour la fabrication d'un non-tissé soufflé en fusion, dans lequel une pluralité de filaments synthétiques sont extrudés d'un outil, lesquels sont étirés au moyen d'air de processus chaud et lesquels sont déposés sur une bande-tamis en un non-tissé soufflé par fusion, un écoulement d'aspiration étant soutenu à travers la bande-tamis au moyen d'un dispositif d'aspiration disposé sous la bande-tamis, dans la zone de dépôt des filaments. Dans les procédés et dispositifs connus, le réglage de la perméabilité à l'air du non-tissé soufflé par fusion à une valeur souhaitée, comme souvent exigé dans le cas d'applications de filtrage, est très compliqué. La perméabilité à l'air du non-tissé soufflé par fusion est mesurée, pour cette raison, au moyen d'un capteur de perméabilité à l'air disposé en dessous ou au-dessus du non-tissé soufflé par fusion défilant. Une valeur de consigne de la perméabilité à l'air du non-tissé soufflé par fusion est atteinte par l'ajustement automatique au moyen d'un dispositif de commande de l'air de processus et/ou de l'écoulement d'aspiration à travers la bande-tamis et/ou d'une distance entre l'outil et la bande-tamis.
PCT/EP2019/066129 2018-06-27 2019-06-19 Procédé pour la fabrication d'un non-tissé soufflé en fusion et une installation de fusion-soufflage WO2020002065A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE112019003186.4T DE112019003186A5 (de) 2018-06-27 2019-06-19 Verfahren zum Herstellen eines Meltblown-Vlieses und eine Meltblown-Anlage
CN201980043337.1A CN112368437A (zh) 2018-06-27 2019-06-19 用于制造熔喷无纺织物的方法和熔喷设备

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018005081.6 2018-06-27
DE102018005081.6A DE102018005081A1 (de) 2018-06-27 2018-06-27 Verfahren zum Herstellen eines Meltblown-Vlieses und eine Meltblown-Anlage

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Publication Number Publication Date
WO2020002065A1 true WO2020002065A1 (fr) 2020-01-02

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DE (2) DE102018005081A1 (fr)
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CN111607906A (zh) * 2020-07-02 2020-09-01 北京睿德医科技有限公司 熔喷非织造布生产机

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CN113377063B (zh) * 2021-08-12 2022-02-01 南通海蓝德机械有限公司 一种管道直燃式纺织用熔喷装置

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