JP6851341B2 - Equipment for producing spunbonded non-woven fabrics from endless filaments - Google Patents

Description

The present invention relates to an apparatus for producing spunbonded non-woven fabrics from endless filaments, particularly endless filaments made of thermoplastic synthetic materials.
With at least one spinneret for spinning the endless filament,
With at least one cooling device for cooling the filament,
With at least one stretching device for stretching the filament, and
It is provided with at least one mounting device for mounting the filament on a non-woven web.
"Endless filament" means a filament having a substantially endless length within the scope of the present invention. These endless filaments differ from staple fibers in that they have a much shorter length, eg, 10 mm to 60 mm.

Devices of the mode described above are known in practice in various embodiments, in principle. Such a device is also also referred to as a spunbond device.
Many of the devices known from the practice of this mode have the drawback of poor quality of filament substrates at high filament speeds and high charge and production rates. This is particularly related to the uniformity of the placement and the strength of the non-woven web produced. The high filament speed and low count of the produced filaments can often be achieved with only a clear quality loss of the non-woven web produced.
Therefore, these known devices have room for improvement.

There is no prior art document information to describe for devices of this type.

In response to the above, the underlying task of the present invention is to provide a device of the style described at the beginning, in which high filament speeds and low counts, as well as high production speeds, are present. It can be achieved and nevertheless, the quality of the filament placement or the resulting non-woven web meets all requirements.

In order to solve this technical problem, the present invention teaches an apparatus for producing a spunbonded nonwoven fabric, particularly from endless filaments made of thermoplastic synthetic materials, which are used to spin the endless filaments. With at least one spinneret for delivery,
With at least one cooling device for cooling the filament,
With at least one stretching device for stretching the filament, and
It comprises at least one mounting device for mounting the filament on a non-woven web, especially in the form of a mounting screen belt.
At that time, at least one diffuser is disposed between the stretching device and the pre-described device or the pre-described screen belt, so that the filament and the primary air are discharged from the stretching device to the diffuser. At least two secondary air inflow gaps are provided in the region of at least one of the diffusers, which are located on opposite sides of the diffuser, to reach the inside of the diffuser. Secondary air reaches the inside of the diffuser through the air inflow gap and
At that time, at least one of the secondary air inflow gaps, preferably at least two of the secondary air inflow gaps, allows the secondary air to flow with respect to the filament flow direction FS, or the length of the device or the diffuser. It is formed with the condition that it flows in at the flow-in angle α with respect to the direction center axis M, and at that time, the flow-in angle α is smaller than 100 ° and purposefully 90 ° or less, which is advantageous. Is less than 80 °, preferably less than 70 °, and especially less than 65 °,
In the flow direction of the filament, a convergent diffuser portion is connected behind or below the secondary air inflow gap.
In the flow direction of the filament, the narrow position of the diffuser is connected to the convergent diffuser portion, and at least one divergent diffuser portion is connected to the narrow position.
The convergent diffuser portion is shorter or clearly shorter than the divergent diffuser portion, and the length of the convergent diffuser portion is the length of the divergent diffuser portion. The maximum value is 60%,
At that time, the last (letzte) diffuser portion in the filament flow direction FS has a diffuser wall portion that diverges toward the previously described device, and at this time, these diffuser wall portions are in the mechanical direction (MD). ) Forming a diffuser outflow portion having a width B.
At that time, one suction device for sucking air or process air through the pre-described device or the pre-described screen belt is provided, and at that time, it is arranged below the diffuser outflow portion. The provided suction region has a width b in the mechanical direction (MD), and this width b is larger than the width B of the diffuser outflow portion.
"Mechanical direction (MD)" means, within the scope of the present invention, the transport direction of the filament mount or the non-woven web, especially on the mount device or mount screen belt.

It is within the scope of the present invention that the suction region extends below the diffuser with the width b of the suction region over the entire width B of the diffuser outflow portion. It is further within the scope of the present invention that this suction region is bounded by two separation walls arranged one after the other in the mechanical direction. The width b of the suction region is measured mechanically, especially between the upper ends of both separation walls-facing the mounting device or mounting screen belt.
At least one suction blower is provided for the purpose, and the suction blower sucks the process air in the suction region through the mounting device or the mounting screen belt.
According to an embodiment of the present invention, it is possible that a plurality of suction regions-for example, three suction regions-are arranged one after the other in the mechanical direction, and these suction regions are particularly suction of these suction regions. They differ from each other in terms of speed. In that case, the suction region claimed in claim 1 is a main suction region arranged below the diffuser outflow portion or immediately below the diffuser outflow portion. Basically, the suction region or main suction region provided below the diffuser outflow portion or immediately below the diffuser outflow portion can be separated by itself, for example, by a separation wall.
In that case, the suction region or main suction region is characterized by the suction velocities being the same or essentially the same over the entire width b of the suction region. Objectively, the average suction rate within the suction area or main suction area varies from 20% or less, especially 30% or less or 40% or less, and especially 50% or less.
In this regard, according to a modification of the embodiment, within the suction region or additional suction region disposed in front of the suction region or main suction region with respect to the mechanical direction (MD) and / or with respect to the mechanical direction (MD) the suction region or main. It is within the scope of the present invention that there is one suction rate within the additional suction area located behind the suction area, and this suction rate is different from the suction rate of this suction area or the main suction area. Is inside.

According to a particularly recommended embodiment of the present invention, the width b of the suction region is at least 1.2 times, preferably at least 1.3 times, and particularly preferably at least 1.4 times the width B of the diffuser outflow portion. It is a double value. According to the modification of the embodiment, the width b of the suction region can be at least 1.5 times, particularly at least 1.6 times, or at least 1.7 times the width B of the diffuser outflow portion.

In a highly advantageous embodiment of the present invention, the suction region projects beyond the width of the diffuser outflow portion by only the first suction portion after the suction region of the filament with respect to the mechanical direction (MD) and / or. At that time, the suction region is characterized by protruding only the second suction portion beyond the width of the diffuser outflow portion in front of the suction region of the filament in the mechanical direction (MD).
Advantageously, the suction region or the main suction region exceeds the width B of the diffuser outflow portion with respect to the width b of the suction region on both sides, and only the first suction portion on one side, and Only the second suction portion protrudes on the other side. For the purpose of purpose, the width b ₁ of the first suction portion and / or the width b ₂ of the second suction portion is from 2% to 30% of the width B of the diffuser outflow portion, preferably 2.5. Values from% to 25%, and particularly advantageously from 3% to 20%.

A highly recommended embodiment of the present invention is for suction by the suction device to direct the tertiary air along the outer surface of the diffuser wall to the mounting device or screen belt, at least within the area of the diffuser outflow. It is performed conditionally to flow into and is characterized by at least a portion of this tertiary air being sucked through a mounting device or mounting screen belt. At that time, the flow of the tertiary air is oriented parallel to or basically parallel to the mixed flow of the primary air and the secondary air flowing in the direction toward the diffuser outflow portion inside the diffuser. What is being done is within the scope of the present invention.
Volumetric flow rate V _T of the tertiary air is sucked with a suction device, at least 25% of the volume flow rate of primary air and secondary air is sucked, preferably at least 30%, preferably at least 40%, and, in particular, It is recommended that the value be at least 50% favorably. The advantageous suction described above of this tertiary air has been demonstrated to be useful in that this can avoid unwanted eddy currents within the suction region of the filament.

According to the present invention, endless filaments are manufactured with a spunbonding device. At that time, the cooling device, the stretching device, and at least one diffuser are manufactured in the lateral direction with respect to the mechanical direction (MD), or the width of the non-woven fabric web to be manufactured (CD width (DC-Breite)). It is within the scope of the present invention to extend over.
According to a particularly advantageous embodiment of the present invention, the mechanism unit including the cooling device and the stretching device is formed as a closed mechanism unit, and the cooling device and the stretching device other than the supply of cooling air in the cooling device. No further supply of fluid medium, or any additional air supply, into this closed mechanical unit consisting of a mechanical unit consisting of.
This closed mechanical unit or this closed system has proven to be particularly useful within the scope of the present invention and effectively contributes to the solution of technical problems.

A cooling device for a device according to the invention can have only one cooling chamber, in which the filaments are exposed to cooling air or process air at a predetermined temperature.
According to yet another embodiment of the present invention, the cooling device has two cooling chambers arranged one on top of the other or one after the other. Within both of these cooling chambers, the filaments are each exposed to cooling air or process air of different temperatures. The device can also be equipped (eingerichtet), with the condition that the outflow rate of process air from the upper cooling chamber for cooling the filament is different from the outflow rate from the lower cooling chamber.

Within the scope of the present invention, the secondary air inflow gap or the secondary air introduced through the secondary air inflow gap has a special significance. At that time, it is within the scope of the present invention that the secondary air inflow gap extends laterally ((in CD-Richtung)) with respect to the machine direction over the entire width of the device.
According to a highly advantageous embodiment of the present invention, two secondary air inflow gaps located facing each other are arranged between a stretching device and a diffuser connected to the stretching device.
According to the modification of the embodiment of the present invention, two diffusers are arranged one after the other in the filament flow direction FS, and two secondary air inflow gaps located opposite to each other are provided in both of these diffusers. It is provided between them. It is possible that the two secondary air inflow gaps are provided at the same vertical height. However, similarly, it is also within the scope of the present invention that the secondary air inflow gaps are provided at different vertical heights of the device.
According to an advantageous embodiment of the present invention, only two secondary air inflow gaps located opposite each other are provided, and particularly advantageously, between the stretching device and the diffuser.

Further, the secondary air inflow angle α has a special meaning. According to the present invention, at least one secondary air inflow gap, and preferably at least two secondary air inflow gaps, particularly preferably two secondary air inflow gaps, are such that the secondary air is in the filament flow direction FS. It is formed with the condition that it flows in at the inflow angle α.
According to the embodiment of the present invention, the inflow angle α is a value of 80 ° to 110 °. In the recommended embodiment, the inflow angle α is less than 90 °, preferably less than 80 °, preferably less than 70 °, and particularly preferably less than 65 °. It is characterized by that. In doing so, it has been demonstrated that it is particularly useful that the inflow angle α is less than 60 °, preferably less than 55 °, and very advantageously less than 50 °. According to a highly recommended embodiment, the inflow angle α is extremely between 0 ° and 60 °, purposefully between 1 ° and 55 °, and advantageously between 2 ° and 50 °. It is preferably between 2 ° and 45 °, and particularly preferably between 2 ° and 40 °.
It is highly recommended that the inflow of secondary air be carried out with the condition that the secondary air flows parallel or substantially parallel to the filament flow direction FS after the inflow of the secondary air.

Objectively, the secondary air inflow gap is correspondingly provided for the realization of the inflow angle α, in particular using the inflow slope and / or the inflow line, and other objects of its kind. To. According to an advantageous embodiment, in order to realize the inflow angle α, an inclined inflow wall portion connected to or connected to the wall portion of the diffuser is provided in the region of one secondary air inflow gap. The inflow wall portion forms an angle corresponding to or basically corresponding to the inflow angle α with the filament flow direction FS.
Advantageously, in this embodiment, one corresponding inflow wall is provided for each secondary air inflow gap. Such a flow-in wall portion, as recommended, forms one flow-in slope portion in order to realize the flow-in angle α. The realization of the flow angle α according to the present invention has been proved to be particularly useful within the scope of the present invention, and effectively contributes to the solution of technical problems.
In combination with a structure according to the invention of the suction region, a quality high value filament placement and a particularly uniform non-woven web can be provided. Within the combination of the features of the device according to the present invention, the configuration of a closed system, or a mechanical unit consisting of a cooling device and a stretching device as a closed mechanical unit, also has special significance.

"Primary air" means, within the scope of the present invention, process air guided through a stretching device, which flows out of the stretching device or from the stretching duct of the stretching device into the diffuser. To do.
Very advantageous embodiment of the present invention, in the region of the secondary air inlet gap, the ratio V _{P /} V _S of the volume flow of the primary air and secondary air is less than 5, advantageously 4.8 It is characterized by being smaller, preferably less than 4.5.
According to the recommended embodiment of the present invention, the volumetric flow rate of the secondary air flowing in through the secondary air inflow gap is adjustable and advantageously adjustable for each secondary air inflow gap. And, according to the modification of the embodiment, it can be adjusted independently of each other. For this purpose, it is recommended that the cross-sectional area of the secondary air inflow gap be variable or adjustable. For the purpose of purpose, the volumetric flow rates of the secondary air flowing into each of the two secondary air inflow gaps arranged on the opposite sides of the diffuser are the same or basically the same. , Or up to 15%, especially up to 20%. The vertical height of the secondary air inflow gap is a value from 2 mm to 20 mm, preferably from 3 mm to 18 mm, particularly preferably from 5 mm to 15 mm.
In an embodiment of the present invention, the volumetric flow rate of the secondary air flowing in through the secondary air inflow gap can be adjusted or changed over the CD width (lateral to the mechanical direction MD). Characterized. Objectively, for this purpose, the vertical height of the secondary air inflow gap is adjusted or varied over the CD width (lateral to the mechanical MD). The adjustment of the secondary air inflow gap is, as recommended, provided that the volumetric flow rate of the secondary air to flow in is reduced to the edge of the device or the edge of the secondary air inflow gap in the CD direction. Will be done.
Advantageously, the secondary air volumetric flow rate flowing through the secondary air inflow gap is less than in the central region of these secondary air inflow gaps only within the marginal region of the secondary air inflow gap. These edge regions then have a length of 5 mm to 20 mm, as recommended. Within these marginal regions, purposefully, up to 75% of the secondary air volume flow rate, preferably up to 80%, is supplied, and this secondary air volume flow rate is at the center of the secondary air inflow gap. Inflow within the area.
A uniform inflow of secondary air through the secondary air inflow gap, either laterally to the mechanical direction or in the CD width of the device, and according to the modifications of the embodiments of the present invention, said edges. It is advantageous within the scope of the present invention to be purposefully carried out within the entire central region of the secondary air inflow gap, except for the region. The present invention is therefore based on the recognition that, with this, a particularly uniform filament mount can be achieved, or a very uniform filament mount can be achieved over the CD width.

A highly recommended embodiment of the invention is characterized by the connection of one diffuser or one astringent portion of the diffuser behind or below the secondary air inflow gap in the filament flow direction. Be done.
In doing so, one embodiment is extremely advantageous, in which one convergent portion of the diffuser is, first of all, behind or below the secondary air inflow gap in the filament flow direction. Disposed, then one narrow position of the diffuser is connected, and one divergent portion of the diffuser is provided behind or below this narrow position (convergent-). Narrow position-spreading end).
In the narrow position, so to speak, the inflowing secondary air or the compression of the primary air-secondary air mixture is performed. A preferred embodiment is characterized by the convergent portion of the diffuser being shorter or clearly shorter than the divergent portion of the diffuser. For the purposes, the length l _K of the convergent diffuser portion is up to 75%, preferably up to 60%, and preferably up to 50% of _{the length l D} of the divergent portion of the diffuser. It is a value of%. As recommended, the length l _K of the convergent portion of the diffuser reaches up to 40%, preferably up to 30%, _{of the length l D} of the divergent portion of the diffuser.
For the purpose, the ratio l _K / l _D of the length l _K of the convergent diffuser portion to the length l _D of the divergent diffuser portion is 0.1 to 1, preferably 0.15 to 0. It is a value up to 0.9.
_{It is recommended that the length l K} of the convergent diffuser portion be a value from 5% to 50% of the total length L of the diffuser, and preferably from 10% to 50%.

The diffuser portion-or the last diffuser portion in the filament flow direction, located above the mounting device-, the diffuser outflow angle β is up to 30 °, preferably up to 25 °, and very advantageously. The maximum value of 20 ° is within the scope of the present invention.
The diffuser outflow angle β is therefore measured between the diffuser wall portion of the divergent diffuser portion and the longitudinal central axis M of the diffuser. Advantageously, the diffuser wall portion of the divergent diffuser portion forming the diffuser outflow portion is formed to be swivelable, so that the diffuser outflow angle β is variable or adjustable. As recommended, the width B of the diffuser outlet portion of the flared diffuser portion, stretching duct stretching apparatus or the stretching apparatus, the width V _B of the outlet gap, up to 300%, preferably not more than 250% the , And, advantageously, a value of up to 200%.
In a particularly advantageous embodiment of the present invention, the distance between the diffuser or the lower edge of the diffuser-especially the lowermost lower edge-with respect to the mounting device or the mounting screen belt-is from 20 mm to 300 mm, especially from 30 mm. It is characterized by values up to 150 mm and preferably from 30 mm to 120 mm.

It is within the scope of the present invention that the monomer suction device is arranged between the spinneret and the cooling device. With this monomer suction device, air is sucked from the filament forming chamber below the spinneret. By this, gases such as monomers, oligomers, decomposition products, and other products of the kind that occur alongside endless filaments can be removed from the apparatus according to the present invention.
The monomer suction device purposefully has at least one suction chamber, to which at least one suction fan is advantageously connected. At least one suction chamber is provided with at least one suction slit for suction of the gas towards the filament forming chamber.
For a particularly effective solution to technical challenges,
Between the spinneret and the monomer suction device, at least one first deformable sealant is provided for sealing the first gap formed between the spinneret and the monomer suction device. Cage and / or
At that time, at least one second deformable sealing material is provided between the monomer suction device and the cooling device for sealing the second gap formed between the monomer suction device and the cooling device. And / or
At that time, at least for sealing the third gap formed between the cooling device and the stretching device or the intermediate pipeline of the stretching device or the stretching device or the intermediate pipeline. A third deformable sealant is provided,
The advantageous embodiments of the invention characterized by this contribute.
Advantageously, the abutting properties, in particular the pressing force or pressing pressure of such deformable sealant, are variable or post-adjustable with respect to the boundary region or interface of the respective gap. An advantageous deformable sealant of this form extends over the entire width of the device according to the invention or across the entire CD width (laterally relative to the machine direction), as recommended. It is within the scope of the present invention that such a deformable sealing material covers or essentially covers and surrounds the entire circumference of the filament flow line.
Further, the vertical height h of the gap to be sealed with the deformable sealing material is a value from 3 mm to 35 mm, particularly from 5 mm to 30 mm, and at least one deformable sealing material. Sealing this gap over this height h is within the scope of the present invention. For the purpose, the unevenness with respect to the height h of the gap can be compensated by the change or post-adjustment of the contact characteristics of the sealing material in the height direction.
The sealing material can be filled or can be filled with a fluid medium, and post-adjustment or adjustment of the sealing material can be done by introducing a fluid medium into the sealing material, or by this. It is recommended that this be done by deriving a fluid medium from the sealant. Advantageously, at least one deformable sealant is an expandable sealant.
According to the deformation of other embodiments, the deformable sealant also has at least one sealing element pressed against the interface of the gap to be sealed using at least one spring element. It is also possible to be there. It is possible that the sealing element is, in particular, a sealing lip-like piece, and that the sealing material is associated with it a spring-loaded sealed lip-shaped piece. The spring element is then purposefully fixed at the interface of the gap to be sealed and presses the sealing element or closed lip-like piece against the opposing interface of the gap. Advantageously, at least one deformable sealant is provided with the condition that the seal is performed at a pressure of 2,000 Pa or more, particularly 2,500 Pa or more, in the filament flow conduit.
Embodiments with this deformable sealant have proven to be particularly useful within the scope of the teachings according to the present invention. In the combination of the remaining, according to the invention or advantageous features of the device according to the present invention, optimal, aerodynamic behavior is given within the device, and the device effectively follows the invention technically. Contribute to solving various problems.

The present invention is based on the recognition that non-woven webs or spunbonded non-woven fabrics of excellent quality can be produced with devices according to the present invention. In particular, using the teachings according to the present invention, a uniform filament mount and, along with it, a uniform non-woven web can be produced in the machine direction and in the transverse direction with respect to the machine direction. Optimal, uniform non-woven fabric mounts are also achievable, especially at relatively high or high production rates as well.
With a device according to the present invention, high filament velocities and, with concomitantly, low filament counts, are nevertheless (nichtsdestowenig) and are feasible in good, uniform filament placements. High filament speeds and low counts are achievable at high charge volumes or production rates of, for example, 400 m / min and above, without any problems.
It should be emphasized that the device according to the present invention is nevertheless relatively simple and composed of less effort or complexity.

Hereinafter, the present invention will be described in detail with reference to a diagram illustrating only one embodiment.

It is a schematic vertical sectional view of the apparatus according to this invention. FIG. 1 is a schematic enlarged view of portion A of the lower region of the apparatus according to the present invention of FIG.

The figure shows an apparatus according to the present invention for producing a spunbonded non-woven fabric from an endless filament 1, particularly an endless filament 1 made of a thermoplastic synthetic material.
This device has a spinneret 2 for spinning the endless filament 1 and a cooling device 3 for cooling the filament. A monomer suction device 4 is arranged between the spinneret 2 and the cooling device 3 according to a particularly advantageous embodiment of the present invention. With this monomer suction device 4, the interference gas generated during the spinning process can be removed from the device. At that time, what is being dealt with here is, for example, a monomer, an oligomer, or a decomposition product, and such a substance.
A gap 5 is formed between the monomer suction device 4 and the cooling device 3, and this gap usually surrounds the entire filament forming chamber or the filament flow chamber. According to a highly advantageous embodiment and an embodiment according to these figures, at least one deformable sealing material 6 for sealing the gap 5 is disposed between the monomer suction device 4 and the cooling device 3. (In particular, see FIG. 1). For the purpose of purpose, at least one deformable sealing material 6 covers and surrounds the entire filament forming chamber or filament flow chamber in the gap 5. At that time, it is within the scope of the present invention that the contact characteristics of the sealing material 6 with respect to the boundary surface of the gap 5, particularly the pressing force or the pressing pressure, can be changed or post-adjusted.
The vertical height h of the gap 5 is a value from 5 mm to 30 mm in this embodiment, and at least one deformable sealing material 6 is this over the vertical height h of the gap 5. The gap 5 is sealed. Advantageously, and in this embodiment, at least one deformable sealant 6 is a sealant 6 that is expandable with a fluid medium. The contact characteristics of the sealing material 6, particularly the pressing force or pressing pressure, can be changed by the supply or discharge of a fluid medium-preferably air.

In this embodiment (particularly with reference to FIG. 1), the cooling device 3 has two cooling chambers arranged one on top of the other or one after the other, in which the filaments are particularly. , Exposed to different temperatures of process air or cooling air. Basically, within the scope of the present invention, however, a cooling device 3 having only one cooling chamber is also possible.

A stretching device 7 for stretching the filament 1 is post-connected to the cooling device 3 in the filament flow direction FS.
Advantageously, and in this embodiment, an intermediate line 8 is connected to the cooling device 3, and this intermediate line connects the cooling device 3 to the stretching duct 9 of the stretching device 7. According to an advantageous embodiment, and in this embodiment, the mechanical unit consisting of the cooling device 3 and the stretching device 7, or the mechanical unit consisting of the cooling device 3, the intermediate pipeline 8, and the stretching duct 9 is closed. It is formed as a system. No further supply of air is made into this mechanical unit, except for the supply of cooling air in the cooling device 3.
The air guided through the stretching device 7 or stretching duct 9 is referred to here and below as primary air P.

According to the present invention, at least one diffuser 10 is connected to the stretching device 7 in the filament flow direction FS. Advantageously, and in this embodiment, two opposing secondary air inflow gaps 11 for the introduction of secondary air S between the stretching device 7 or stretching duct 9 and the diffuser 10. 12 is arranged. For purpose, these secondary air inflow gaps 11 and 12 extend over the full width or CD width (CD-Breite) of the apparatus according to the present invention.
According to the present invention, the secondary air passing through the secondary air inflow gap is supplied with a flow angle α, which is less than 100 °, purposefully less than 90 ° or the same, advantageously. Less than 80 ° and, in this example, less than 45 °. According to a highly recommended embodiment of the invention, this flow angle α is between 0 ° and 60 °, preferably between 2 ° and 50 °.
In order to realize the inflow angle α, in this embodiment (particularly, see FIG. 2), a correspondingly installed inflow guide portion 13 is provided, and these inflow guide portions are inclined in this embodiment. Therefore, it is formed as an inflow conduit 14 connected to the secondary air inflow gaps 11 and 12. At that time, the inflow conduit 14 forms one angle with the condition that the filament flow direction FS or the longitudinal central axis M and the secondary air can flow in under the above-mentioned inflow angle α. are doing.
According to a particularly advantageous embodiment, the secondary air flows in substantially parallel to the filament flow direction FS.

According to a highly recommended embodiment of the present invention, the volumetric flow rate of the secondary air supplied through the secondary air inflow gaps 11 and 12 can be adjusted. This can be achieved, in particular, by adjusting the cross-sectional areas of the secondary air inflow gaps 11 and 12. Basically, different volumetric flow rates of similarly supplied secondary air S can be adjusted for both opposite secondary air inflow gaps 11 and 12.
According to an embodiment of the present invention, the secondary air volumetric flow rate flowing through the secondary air inflow gaps 11 and 12-favorably with respect to the respective secondary air inflow gaps 11 and 12-is lateral to the machine direction. It can be adjusted or varied in the direction or across the CD width. At that time, the secondary air volumetric flow rate supplied in the edge region of the device or the secondary air inflow gaps 11 and 12 for the purpose is the central region of the device or these secondary air inflow gaps 11 and 12. It differs compared to the 12 central regions.

Based on the inflow of the secondary air S through the secondary air inflow gaps 11 and 12, the primary air P is subsequently mixed with the secondary air S in the diffuser 10. According an advantageous embodiment of the present invention, in the region of the secondary air inlet gap 11, the ratio V _{P /} V _S of the volume flow of the primary air and secondary air is less than 5, and preferably , Less than 4.5.

In this embodiment according to these figures, only one diffuser 10 is provided below the stretching device 7 in the filament flow direction FS. Basically, it is possible that two or more diffusers 10 are connected one after the other in the same way. The diffuser 10 provided in the present embodiment according to these figures has a convergent diffuser portion 15 behind or below the secondary air inflow gaps 11 and 12 in the filament flow direction FS according to an advantageous embodiment. There is.
Advantageously, and in this embodiment, the narrow position 16 of the diffuser 10 is connected to the convergent diffuser portion 15. In the filament flow direction FS, behind or below the narrow position 16, the diffuser 10 is advantageous and, in this embodiment, a divergent diffuser portion 17.
As recommended, and in this embodiment, the divergent diffuser portion 17 of the diffuser 10 is longer, or distinctly longer, in the filament flow direction FS than the convergent diffuser portion 15. Advantageously, and in this embodiment, the length l _K of the convergent diffuser portion 15 is less than 50% _{of the length l D} of the divergent diffuser portion 17.

As recommended and in this embodiment, the diffuser outflow angle β between the diffuser wall 18 of the divergent diffuser portion 17 and the longitudinal central axis M of the diffuser 10 is a value of up to 25 °. .. Expediently, and, in this embodiment, the width B of the diffuser outlet section 19, the width _{V B} of the outlet gap 20 of the stretching duct 9, up to 300%, advantageously 250% of the value.

The endless filament 1 flowing out of the diffuser 10 is placed on a filament mounting object or a non-woven fabric web 22 on a mounting device formed as a mounting screen belt 21. The filament mounting object or the non-woven fabric web 22 is then discharged, moved or carried out in the mechanical direction MD by the mounting screen belt 21.
According to the present invention, a suction device for sucking air or process air through a mounting device or a mounting screen belt 21 is provided. For this purpose, a suction region 23 is disposed below the diffuser outflow portion 19, which has one width b in the mechanical direction (MD). The width b of the suction region 23 is larger than the width B of the diffuser outflow portion 19 according to the present invention. In FIG. 2, widths b and B are shown.
According to an advantageous embodiment of the present invention, the width b of the suction region 23 is at least 1.2 times, preferably at least 1.3 times, the width B of the diffuser outflow portion 19. In this embodiment, the width B of the diffuser outflow portion 19 is measured as the horizontal spacing of the lower ends of the diffuser wall portion 18.
If the ends of the diffuser wall 18 of the divergent diffuser portion 17 are not terminated in the same horizontal plane or at the same vertical height, it is advantageous to have the same vertical orientation. The distance from the end of the extended virtual, shorter diffuser wall 18 at the height of is measured from the end of the longer diffuser wall 18.

The suction region 23 arranged on the lower side of the mounting screen belt 21 is bounded by two separation walls 27 and 28 arranged one after the other in the mechanical direction MD. The width b of the suction region 23 is measured as the distance between both separation walls 27, 28 and as the distance between the upper ends of both separation walls 27, 28.
In particular, from FIG. 2, the suction region 23, in the mechanical direction (MD), after the suction region of the filament 1, only the first suction portion 24, beyond the diffuser outflow portion 19, or the width B of the diffuser outflow portion 19. It can be seen that it protrudes beyond. Further, the suction region 23 exceeds the diffuser outflow portion 19 or the width B of the diffuser outflow portion 19 only by the second suction portion 25 in front of the suction region of the filament 1 in the mechanical direction (MD). Is protruding.
In the Figure 2, the first suction portion 24 is the width b _1, and a second suction portions 25 has a width b _2, it is recognizable. In one embodiment, and in this embodiment, the widths b ₁ and b ₂ are of the same size. Basically, these widths, however, can be configured differently as well.

In particular, based on the configuration of the suction region 23 according to the present invention, the suction through the mounting screen belt 21 is such that the tertiary air T is mounted along the outer surface 26 in the region of the diffuser outflow portion 19. It is done with the condition that it flows in the direction of.
According to a particularly advantageous embodiment, the flow of the tertiary air T is then parallel to or parallel to the mixed flow of the primary air P and the secondary air S flowing in the direction of the diffuser 10 to the diffuser outflow portion 19. , Is basically oriented in parallel.
Along with this, according to a very advantageous embodiment of the present invention, the primary air P and the secondary air S are sucked through the mounting screen belt 21, and similarly, the tertiary air T is also sucked.
Objectively, then, the flows of the primary air P, the secondary air S, and the tertiary air T flow through the mounting screen belt 21 in parallel or substantially parallel.

1 Filament, endless filament 2 Spinning cap 3 Cooling device 4 Monomer suction device 5 Gap 6 Sealing material 7 Stretching device 8 Intermediate pipeline 9 Stretching duct 10 Diffuser 11 Secondary air inflow gap 12 Secondary air inflow gap 13 Inflow guide 14 Inflow Pipeline 15 Convergent diffuser part 16 Narrow position 17 Spreading diffuser part 18 Diffuser wall part 19 Diffuser outflow part 20 Outflow gap of extension duct 9 21 Mounting screen belt 22 Non-woven fabric web 23 Suction area 24 First suction part 25 2nd suction part 26 Outer surface 27 Separation wall 28 Separation wall b Width of suction area 23 b ₁ width b ₂ width B Width of diffuser outflow part 19 FS Filament flow direction h Vertical height l _K Convergent diffuser Length of part 15 l _D Length of divergent diffuser part 17 M Longitudinal central axis MD Mechanical direction P Primary air S Secondary air T Tertiary air V _B Outflow gap 20 width α Inflow angle β Diffuser outflow angle

Claims (8)

In particular, it is an apparatus for producing a spunbonded nonwoven fabric from an endless filament (1) made of a thermoplastic synthetic material, and this apparatus is
At least one spinneret (2) for spinning the endless filament (1), and at least one cooling device (3) for cooling the filament.
With at least one stretching device (7) for stretching the filament, and
It comprises at least one mounting device for mounting the filament on a non-woven web, especially in the form of a mounting screen belt (21).
At least one diffuser (10) is disposed between the stretching device (7) and the pre-described device or the pre-described screen belt (21), so that the filament and the primary air are the same. At least two secondary units that reach into the diffuser (10) from the stretching device and are located on opposite sides of the diffuser (10) within the region of at least one diffuser (10). Air inflow gaps (11, 12) are provided, and secondary air reaches the inside of the diffuser (10) through the secondary air inflow gap.
At least one of the secondary air inflow gaps (11, 12), preferably at least two of the secondary air inflow gaps (11, 12), allow the secondary air to flow in the filament flow direction (FS). Alternatively, it is formed with the condition that it flows in at an angle (α) with respect to the longitudinal central axis (M) of the device or the diffuser (10), and the inflow angle (α) is from 100 °. Also small, purposefully less than 90 °, preferably less than 80 °, preferably less than 70 °, and especially less than 65 °.
A convergent diffuser portion (15) is connected behind or below the secondary air inflow gaps (11, 12) in the flow direction of the filament.
In the flow direction of the filament, the narrow position of the diffuser (10) is connected to the convergent diffuser portion (15), and at least one divergent diffuser portion (17) is connected to the narrow position. Is connected and
The convergent diffuser portion (15) is shorter or clearly shorter than the divergent diffuser portion (17), and the length of the convergent diffuser portion (15) is increased. It is a value of up to 60% of the length of the divergent diffuser portion (17).
The last diffuser portion in the filament flow direction (FS) has a diffuser wall portion (18) that diverges toward the above-described device, and these diffuser wall portions (18) are in the mechanical direction (MD). Forming a diffuser outflow portion (19) having a width (B) in the
At least one suction device for sucking air or process air through the pre-described device or the pre-described screen belt (21) is provided and below the diffuser outflow section (19). The disposed suction region (23) has a width (b) in the mechanical direction, and this width is larger than the width (B) of the diffuser outflow portion (19).
A device characterized by that. The width (b) of the suction region (23) is at least 1.2 times, preferably at least 1.3 times, and particularly preferably at least at least 1.2 times the width (B) of the diffuser outflow portion (19). The apparatus according to claim 1, wherein the value is 1.4 times. The suction region (23) protrudes beyond the diffuser outflow portion (19) only by the (first) suction portion (24) after the suction region of the filament in the mechanical direction (MD). And / or the suction region (23) in front of the suction region of the filament with respect to the mechanical direction (MD), the diffuser outflow portion (19) by the (second) suction portion (25). The device according to claim 1 or 2, characterized in that it protrudes beyond. The suction by the suction device causes the tertiary air to flow along the outer surface of the diffuser wall portion (18), at least within the region of the diffuser outflow portion (19), according to the pre-described device or the pre-described screen belt (21). ) With the condition that it flows in the direction of
The flow of the tertiary air is advantageously parallel to the mixed flow of the primary air and the secondary air flowing in the direction of the diffuser outflow portion (19) inside the diffuser (10). Or basically oriented in parallel, and
The device according to any one of claims 1 to 3, wherein the tertiary air is also sucked through the pre-described device or the pre-described screen belt (21). _{The volumetric flow rate (VT} ) of the tertiary air sucked by the suction device is at least 25%, preferably at least 40%, and particularly advantageous of the volumetric flow rates of the primary air and the secondary air sucked. The apparatus according to any one of claims 1 to 4, wherein the value is at least 50%. The mechanical unit including the cooling device (3) and the stretching device (7) is formed as a closed mechanical unit.
A claim characterized in that no further supply of fluid medium, or any further supply of air, into the closed mechanical unit other than the supply of cooling air in the cooling device. The device according to any one of 1 to 5. Any of claims 1 to 6, wherein the diffuser outflow angle (β) of the diffuser (10) with respect to the longitudinal central axis (M) is a value of a maximum of 30 °, preferably a maximum of 25 °. The device described in one. The distance between the diffuser (10) or the lower edge of the diffuser (10) with respect to the pre-described device or the pre-described screen belt (21) is from 20 mm to 300 mm, particularly from 30 mm to 150 mm, and advantageously. The apparatus according to any one of claims 1 to 7 , wherein is a value from 30 mm to 120 mm.

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