JP2000199164A - Apparatus for producing spun-bonded nonwoven fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a production apparatus capable of spinning two kinds of filament components having different sizes and melting points while increasing the treating amount per unit area. SOLUTION: Each rectangle or circular spinning nozzle package used for spinning a thermoplastic filament comprises a molten matter channel 12 and extrusion bores 8 for polymer compound with the high melting point, and a molten matter channel 13 and extrusion bores 7 for passing a polymer compound having a melting point 5-50 deg.C lower than that of the polymer compound with the high melting point, respectively. Insulating caves 10 and 11 with various structures thermally isolate these molten matter channels used in different temperatures.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing a spunbonded nonwoven fabric, that is, a planar structure composed of a large number of endless filaments. These filaments are formed by spinning or extruding molten plastic from an apparatus that includes a number of nozzles (bases). The molten plastic is formed into a filament via a nozzle, deposited and carried out. The integrity of the spunbond nonwoven is obtained by the filaments being more or less bonded to each other at their intersections.

More specifically, the present invention relates to a spinning nozzle package for a spunbonded nonwoven fabric manufacturing apparatus. The nonwoven fabric is composed of two types of endless filaments that differ at least in the melting temperature range and are bonded using heat.
These endless filaments are produced by simultaneously spinning or extruding two polymer compounds with different melting temperature ranges, then mixed and deposited simultaneously on a flat surface.

The planar structure thus obtained is heated to a temperature at which only one filament softens in the next step. After cooling, bonding is established at all intersections of the two filaments and at the intersection of the low melting filaments. In this way, the low melting filament acts as a binder.

[0004]

2. Description of the Related Art An example of an apparatus for producing a spunbonded nonwoven fabric is described in DE-C2 34 19 675. According to this, sometimes used in the construction industry for various large sealing applications, as a bitumen-coated substrate,
A stable spunbond nonwoven is produced. The structure of this nonwoven fabric is characterized by two types of endless filaments that are thermally bonded. One type (matrix filament)
Consists of a very high melting point polyethylene glycol terephthalate and is present in the nonwoven in a proportion of 70 to 90% by weight. The other type (binder filament) is polybutylene glycol terephthalate, 30 to 10% by weight
But acts as a binder because the melting temperature is only about 225 ° C. For these two types of filaments, a monofilament fineness of 4.5 to 6.5 dtex is mentioned.

[0005] The production of the nonwoven fabric described above is carried out by extruding two types of molten polymer materials for each filament from a side-by-side array of bases. In this case, specifically, in terms of material supply and temperature management, one type of polymer is assigned one base. The spun filament bundle is stretched by pneumatic pressure applied from the side under the nozzle, hits the guide plate or baffle plate,
This plate makes it possible to open the bundle. The filaments are then dropped and deposited on a grid endless belt. Alternatively, the filaments can be combined and pneumatically drawn together. In this case, a particularly good mixing of the two filaments is obtained.

[0006] It is preferable to perform a needling operation after the continuous deposition. Following this operation, thermal calendering is also performed continuously. The deposited planar structure then passes through a linear gap defined between two cylindrical rolls, at least one of which is heated. At the time of heating, a temperature at which only the low-melting-point filament is softened to such an extent that it can be bonded at the intersection of the filaments is selected. The combined planar structure is cooled between the cooling cylinders, followed by a winding operation. At this stage, the nonwoven according to DE-C2 34 19 675 has an areal weight of 100 to 180 g / m ² .

[0007] A flexible planar structure having excellent dimensional stability can be obtained by simultaneous spinning of a matrix filament and a binder filament and the above-described processing.
Further, by performing the thermal bonding step continuously, economical production becomes possible. Thermal bonding can reduce the energy cost associated with manufacturing by about eight times compared to chemical bonding. According to DE-C2 34 19 675, the values of tear strength and elongation are almost the same in various directions parallel to the plane of the nonwoven fabric.

[0008] However, while the above-mentioned technology has the above-mentioned advantages, a spinning nozzle suitable for each type of filament (high-melting-point matrix component, low-melting-point binder component) and capable of performing control operation and temperature control individually. There is a request to use (base). Since there is a limit to the minimization of the nozzle dimensions, there is also a lower limit on the minimum required location for each nozzle, and thus also on the mutual spacing immediately after the spun filament is discharged from the nozzle.
This places an upper limit on the specific amount of material that can be spun per unit area of each spinning head or spinning nozzle package of the manufacturing apparatus.

[0009] In particular, even when the fineness of the filaments is significantly different, if the distance between the matrix filaments and the binder filaments cannot be reduced, the ratio of the filaments in the deposited nonwoven web will fluctuate. In other words, areas with high and low binder filament content occur, which manifest themselves in corresponding undesirable fluctuations in the mechanical properties of the planar structure.
Thus, the possibility of applying the technology disclosed in DE-C2 3419 675 is limited to matrix filaments and binder filaments having the same fineness.

[0010]

Starting from the above problems, the present invention seeks to improve the prior art with respect to the following criteria:

First, even when using matrix filaments and binder filaments in which the characteristics of the polymer compound used as the material are significantly different, the spinning distance is smaller than that required by the individual geometric shapes of the spinning nozzles. It must be able to spin at a higher specific throughput per head. At the same time, a more thorough mixing of the two filaments must be obtained during the deposition.

[0012] In addition, at least the melting temperature range and the fineness parameter of a polymer compound having different physical properties of a spun material and a filament are determined by the above-mentioned prior art according to DE-C2 34 19 675 (hereinafter referred to as the prior art). Case values in parentheses). This includes, for example:

The melting temperature range of the binder filament is from 125 to 245 ° C. (225 ° C.). The matrix filament / binder filament fineness ratio is from 1: 1 to 1:10 (1: 1). 500 g / m ²
(100 to 180 g / m ² ) ・ 5 to 50% by weight of binder filament to matrix filament (10 to 180 g / m ² )
30% by weight).

Furthermore, in any event, if the above requirements are to be fulfilled, the ratio of matrix filaments to binder filaments after being deposited as a web must be very uniform over all surface and cross-sectional areas.

[0015] The requirement to vary the fineness significantly is imposed in applications where the problem is weak, especially at the many small junctions between the matrix filaments and the binder filaments. One example is carpet lining. In this case, the filaments must be sufficiently flexible in the tufting process, but at the same time it is necessary to finish the carpet with good adhesive bonds, without any free filaments there.

Another example is a roofing base. It is subjected to temperatures of up to 220 ° C. during the bitumen treatment and is subjected to tensile stress under these conditions. In this case, the longitudinal elongation in the stress direction must not exceed 5% of the initial value.

Further, in the case of a nonwoven fabric which must not lose its strength even under a high environmental temperature, such as a soundproof nonwoven fabric in an engine room of an automobile or a roofing base, the melting temperature range of the binder filament is 200 to 2
A high value of 45 ° C is required.

On the other hand, when the lining of the carpet is to be deformed at a low temperature, the melting range of the binder filament is reduced so as not to break the pile yarn of the finished carpet and to reduce the cycle time and cost. A low value of 125 to 180 ° C has to be chosen.

[0019]

According to the present invention, the above object is achieved by separately spinning two types of thermoplastic polymer compounds as filaments having different finenesses and melting temperatures differing from each other by 5 to 50 ° C. The problem is solved by providing and using a spinning nozzle that can be ejected. That is, according to the present invention, there is provided an apparatus for producing a spunbonded nonwoven fabric from a mixture of a high-melting-point thermoplastic matrix filament and a thermoplastic binder filament having a melting point of 5 to 50 ° C. lower, comprising a thermoplastic polymer A spinning nozzle package having a melt channel for the compound and a discharge bore from the channel is surrounded by a heating box for heating the thermoplastic polymer compound, wherein the spinning nozzle package has a high height for the matrix filament. A melt channel and a discharge bore for the molecular compound, and a melt channel and a discharge bore for the polymer compound for the binder filament, these melt channels and being thermally insulated from each other, for the matrix filament Polymer compounds and fibers Temperature sufficient to maintain each in a molten state of the polymer compound for down Zehnder filaments, and wherein the assigned individually to each of the melt channel and are provided.

In the spinning nozzle head or package of the apparatus of the present invention, the optimum temperature control for each kind of polymer compound, that is, the low melting point binder component and the high melting point matrix component, in the respective melting temperature ranges is ensured. To this end, for example, cavities or gaps are provided between the passages through which these polymer compounds are spun, so that the spun passages are thermally isolated from one another. This isolation is achieved, for example, by placing a solid insulator or insulation in the passageways, i.e. the cavities between the melt channels for at least the respective polymer components. Alternatively, the cavity can be filled with air. In this case, the air forms the heat insulating material. The cavities preferably run parallel between the spinning paths, at least between the melt channels.

The spinning passages through which the different polymer components pass, for example the spacing between the melt channel and the discharge bore, and the choice of solid insulator or air, depend on the specific different melting of the two polymer compounds used. Related to temperature. Therefore, at the optimum temperature suitable for each melting temperature, these two
A series of easy-to-run preliminary tests is essential for controlling and controlling species of polymer compounds. Of course, in this case, the difference in melting point is particularly important.

An example of the solid insulator or the heat insulating material is a ceramic material or a glass fiber cloth mat impregnated with a phenol resin or an epoxy resin and cured.

The spinning nozzle package can preferably have a rectangular or circular cross section. In the case of a rectangle, the melt channels and the discharge bores from these channels, when viewed in cross section, can be arranged in rows isolated from each other according to the type of polymer compound, or intermixed and evenly distributed with one another It is also possible. In the case of a circular cross section, the melt channel and discharge bore for the polymer compound for the matrix filament and the melt channel and discharge bore for the polymer compound for the binder filament are preferably with the latter inside. They may be arranged concentrically, or may be arranged irregularly and intermingled with each other. In the case of a concentric arrangement, it is preferable to arrange concentrically a cavity or a heat insulating bore filled with air or a solid insulator as described above to isolate them.

The spinning nozzle package is surrounded by a heating box, particularly to maintain the molten state of the high melting point polymer compound for the matrix filaments, but is preferably a melt channel for the polymer compound for the binder filaments, and furthermore, Preferably, the discharge bore is optionally isolated from the heating box by a cavity or adiabatic gap filled with air or a solid insulator as described above.

When the matrix filaments and the binder filaments are to have different finenesses, the discharge bore, the thin tube or the small tube for producing the thin filaments has a higher throughput than the higher fineness filaments spun in parallel therewith. Of course, the cross section must be designed so that a fine filament can be obtained while reducing the number of filaments. For example, the discharge bore extending from the melt channel may consist of a pre-discharge bore portion followed by a smaller diameter capillary. Also, the lower section of the capillary can be formed as a small tube surrounded by an annular gap filled with air or a solid insulator.

According to the present invention, it is possible for the first time to extrude a very large amount of filaments having a wide variety of types and melting points of polymer compounds in a very narrow place. That is, the spinning throughput per unit area of the spinning nozzle package can be increased. It has also been found that, immediately after leaving the spinning nozzle package, a premixing of the various polymer component filaments already occurs with one another, omitting the subsequent mixing means for the spun filaments. can do. In this case, the fibrillation of the mixed filament does not occur as the distance from the spinning nozzle package increases.

Also according to the invention, the spatial concentration of the spinning filaments already in the region of the spinning nozzle reduces the throughput of a spinning nozzle package or spinning head equipped with a plurality of such nozzles. It is only possible to increase it by a factor of two. Up to now, the increase in throughput was only known to be obtained by increasing the flow rate of the polymer material, but it caused serious problems such as the spun filaments being bundled and poorly cooled. Was.

With the use of an apparatus constructed in accordance with the invention, it was not foreseen that after exiting the spinning nozzle, the interaction of the matrix filaments and the binder filaments would take place below the nozzle. Since the speeds of the two filaments are clearly similar after leaving the spinning nozzle, a very smooth filament movement is observed, for example, up to being deposited on an endless belt running below.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of a manufacturing apparatus according to the present invention, in particular, a structure of a spinning nozzle (cap) package will be exemplarily described with reference to FIGS.

Referring first to FIG. 1, FIG. 1a shows an example of a production apparatus according to the invention in which a spinning nozzle package 1 and spinning points having cooling air 2 blown across the spinning direction are grouped. A side view of a typical embodiment is shown. The high melting point matrix filament is indicated by 3 and the low melting point binder filament is indicated by 4. These two filaments pass through the stretching member 5 and then reach the cooling cabinet 6. From here the two filaments 3 and 4 spread out conically and are discharged and deposited on a deposition belt 19 which moves horizontally in a direction perpendicular to the plane of the drawing. In addition, a suction device can be provided under the belt to further improve the filament deposition and arrangement on the belt.

FIG. 1b shows a plan view of the spinning nozzle package 1 as viewed from below. In this figure, the discharge bore 7 for the binder filament, the discharge bore 8 for the matrix filament, and the heating box 9 can be seen.

FIGS. 2a and 2b show various arrangements of filament discharge bores in a spinning nozzle package having a rectangular cross section. Here again, the discharge bore of the binder filament 7 is indicated by 7, and the discharge bore of the matrix filament is indicated by 8. Each of the spinning nozzle packages 1 is surrounded by a heating box 9. Figures 2c and d
A similar drawing of the spinning nozzle package 1 having a circular cross section
It is about.

In FIGS. 2a and 2c, a plurality of discharge bores 7 and 8 are grouped together, a being in rows isolated from one another with respect to the material, and c in concentric circles being isolated from one another with respect to the material. An arrangement in which the discharge bores 7 and 8 are intermingled and evenly distributed is shown in FIGS. 2b and 2d.

FIG. 3a is a plan view of the spinning nozzle package 1 including the discharge bore 8 of the matrix filament and the discharge bore 7 of the binder filament as viewed from below.
The heating box is again designated by 9. Between the spinning passage for the matrix filaments, i.e. the melt channel and discharge bore 8 not shown, and the spinning passage for the binder filaments, i.e. the melt channel and discharge bore 7 not shown, a cavity or insulating bore 10 is provided. There is. The spinning passage for the binder filament (only the discharge bore 7 is visible in the drawing) is again surrounded by a cavity or adiabatic gap 11. The insulation in these cavities, the insulation bore 10 and the insulation gap 11, may be solid, but may also be filled with air. The insulation gap 11 is
To reduce the effect of heat on the melt channels for the binder filaments and the discharge bore.

FIG. 3b shows an arrangement similar to FIG. 3a for a circular nozzle having concentric discharge bores 7 and 8. The spinning passages for the binder filaments, ie the melt channels and the discharge bores 7 not shown, are arranged in this case linearly at a sufficient distance from the cylindrical heating box 9 and furthermore for spinning the matrix filaments. Because of the passage, ie the arrangement of the melt channel and the discharge bore 8, not shown, from the heating box 9, this arrangement does not require the provision of such an auxiliary insulating gap 11 in FIG. 3a.

The above cavities, such as the insulating bore 10 and the insulating gap 11, are arranged in such a way that the mechanical stability of the spinning nozzle package is never impaired.

FIG. 4 shows a section AA of the spinning nozzle package of rectangular cross section according to FIG. 3a. Here again, the heating box 9 is seen, and the insulating bore 10 and the insulating gap 11 are shown. The insulating bore 10 separates a melt channel 12 for the polymer material of the matrix component and a melt channel 13 for the polymer material of the binder component. Immediately before exiting the nozzle, the melt of the matrix component passes through a melt distribution screen 14, followed by a predischarge bore 15 and a nozzle outlet capillary 16. The same applies to the structure for supplying the material of the binder component.

The lower part of FIG. 4 shows the relationship between the temperature level and the nozzle range corresponding to the cross section shown in the upper part. A sharp boundary between the control temperature for the matrix filaments and the control temperature for the binder filaments is clearly visible. Thus, in the manufacturing apparatus of the present invention, each molten polymer compound can have an ideal temperature for each.

FIG. 5 shows a possible melt feed structure for a spinning nozzle package with a rectangular cross section. In the discharge bore arrangement shown in FIG. 5, in the configuration in which the melt channel 13 for the binder filament and the discharge bore 7 are mixed with the melt channel 12 for the matrix filament and the discharge bore 8, the above-mentioned cavity, that is, the heat insulating gap 11 is provided. Provides thermal separation of the polymer compound for the matrix filaments and the binder filaments. In this case, the polymer compound for the binder filaments is passed through a capillary 16 which connects to the melt channel 13, the lower section of which is formed as a cannula or a small tube 18, respectively, constituting the discharge bore 7. The small tube 18 is an annular gap 17 filled with air or solid insulation.
Surrounded by FIG. 5A and FIG. 5B, which is a cross section taken along the line BB, show such a situation.

[0040]

It will now be described how the production apparatus according to the invention, in particular the spinning nozzle package, can fulfill all the requirements mentioned in the opening paragraph, but not in the context of the invention. Is shown based on an example without limitation.

Example 1 The spinning nozzle package of the embodiment of FIG. 2a is arranged as shown in FIG. 1 and 120 filaments of polyethylene terephthalate and 60 filaments of copolyester of polyethylene terephthalate are respectively extruded. The melting temperature of this copolyester is 180 ° C. The temperature of the polyethylene terephthalate nozzle was 290 ° C and the temperature of the copolymer nozzle was 270 ° C.
Adjust to ° C.

The material supply is selected so that the filaments obtained have a distribution of 90% by weight of polyethylene terephthalate and 10% by weight of copolyester. The fineness of the polyethylene terephthalate filament is 9 dtex.

The two groups of filaments are integrated under a nozzle, stretched together in a stretching device and then deposited in a random array on a horizontally moving sieve belt conveyor.
The loose web thus formed is pre-solidified in a calender by means of two steel rolls at a pressure of 3 t and a speed of 20 m / min. At that time, both rolls were heated to 120 ° C. The upper roll has an embossed surface.

Next, the web is sprayed with a silicone-containing finish, and the binder filaments are surface-melted at 195 ° C. in a passage furnace, and finally solidified. The characteristics of the obtained nonwoven fabric are as follows.

Width of non-woven fabric: 1.60 m Weight of non-woven fabric: 120 g / m ² Dispersion coefficient of material on surface: 5% or less (measured by a square of 10 × 10 cm) Longitudinal tear strength without tufting: 300
N / 5cm (test according to EN 290 73 T3) Longitudinal elongation without tufting: 40% (EN 2
90 73 T3 test) Lateral tear strength without tufting: 290
N / 5cm (Test according to EN 290 73 T3) Lateral elongation without tufting: 40% (EN 2
90 73 T3 test) Longitudinal notch tear strength: 160N (test according to DIN 53 859 third collection) After tufting at a needling density of 5/32 ",
The following characteristics result:

Longitudinal tear strength in tufted state: 270 N / 5 cm (test according to EN 290 73 T3) Longitudinal elongation in tufted state: 50% (EN 290 7
3 T3 test) Lateral tear strength in a tufted state: 210 N /
5cm (test according to EN 290 73 T3) Lateral elongation with tufting: 50% (EN 290 7
3 Test by T3) Longitudinal notch tear strength: 155N (test according to DIN 53 859 3rd) Example 2 The spinning nozzle package of the embodiment of FIG. 2c is arranged as shown in FIG. 1, and 100 polyethylene terephthalate filaments and melting temperature Extrudes 40 filaments of polyethylene terephthalate copolymer at 225 ° C. The nozzle temperature of polyethylene terephthalate is 290 ° C, and the nozzle temperature of the copolymer compound is 270 ° C. Filaments can be obtained with 75% by weight of polyethylene terephthalate and 25% by weight of polyethylene terephthalate copolymer. The fineness of polyethylene terephthalate filament is 11dtex
It is.

The two filament groups for each spinning nozzle package are integrated and drawn together in a drawing device. Subsequently, arrangement and deposition are performed on a horizontally moving sieve-shaped belt conveyor. The loose web thus formed is pre-solidified in a calender by means of two steel rolls at a pressure of 5 t and a speed of 15 m / min. The two rolls are heated to 150 ° C., one of which has an embossed surface. The final solidification of the web takes place in a pass-through furnace at 230 ° C., where the binder filaments are slightly surface-melted. The characteristics of the obtained nonwoven fabric are as follows.

Non-woven fabric width: 1.01 m Non-woven fabric weight: 230 g / m ² Dispersion coefficient of the material on the surface: 5% or less (measured by a 10 × 10 cm square) Thickness: 0.95 mm (test according to ISO 9073-2) Tear strength: 630N / 5cm (Test according to ISO 9073-3) Longitudinal elongation: 32% (Test according to ISO 9073-3) Lateral tear strength: 630N / 5cm (Test according to ISO 9073-3) Lateral direction Elongation: 32% (test according to ISO 9073-3) Longitudinal shrinkage: 0.6% at 200 ° C. and 15 minutes, Lateral shrinkage: 0.6% at 200 ° C. and 15 minutes Example 3 Spinning nozzle package according to FIG. Are arranged as shown in FIG. 1, and 200 polyethylene terephthalate filaments and 90 polyethylene terephthalate copolymer filaments having a melting temperature of 165 ° C. are extruded, respectively. The nozzle temperature of polyethylene terephthalate is 290 ° C, and the nozzle temperature of polyethylene terephthalate copolymer is 220 ° C.

Filaments can be obtained by distributing 85% by weight of polyethylene terephthalate and 25% by weight of polyethylene terephthalate copolymer. The fineness of the polyethylene terephthalate filament is 7 dtex.

The two filament groups of each spinning nozzle package are integrated and drawn together in a drawing device. Subsequently, they are arranged and deposited on a horizontally moving sieve-shaped belt conveyor. The loose web thus formed is pre-solidified in a calender by means of two steel rolls at a pressure of 1.5 t and a speed of 25 m / min. The two rolls are heated to 100 ° C., the lower roll having an embossed surface. The web is then sprayed with a silicone-containing finish and the binder filaments are softened and finally solidified at 180 ° C. in a pass-through furnace.
The characteristics of the obtained nonwoven fabric are as follows.

Width of nonwoven fabric: 1.60 m Weight of nonwoven fabric: 100 g / m ² Dispersion coefficient of material on surface: 5% or less (measured by 10 × 10 cm square) Longitudinal tear strength without tufting: 200
N / 5cm (test according to EN 290 73 T3) Longitudinal elongation without tufting: 31% (EN
290 73 T3 test) Lateral tear strength without tufting: 18
0N / 5cm (test according to EN 29073 T3) Lateral elongation without tufting: 35% (EN
290 73 T3) Notch tear strength in the longitudinal direction: 170 N (test according to DIN 53 859 3) After tufting at a needling density of 5/32 ", the following properties occur:

Tensile strength in the longitudinal direction under tufting: 250 N / 5 cm (test according to EN 290 73 T3) Elongation in the longitudinal direction under tufting: 65% (EN 290 7
3 T3 test) Lateral tear strength in the tufted state: 180N / 5c
m (Test according to EN 290 73 T3) Lateral elongation with tufting: 65% (EN 290 7
3 T3 test) Notch tear strength in the longitudinal direction: 250N (Test according to DIN 53 859 3rd collection)

[0053]

The manufacturing apparatus according to the present invention makes it possible to produce a mixture of matrix filaments and binder filaments having a very sufficient degree of mixing, even if the fineness is clearly different, especially due to the novel spinning nozzle package. Is evident in all three examples above. As mentioned above, this possibility results in a very high strength of the post-treated nonwoven.

[Brief description of the drawings]

FIG. 1a is a side view of a basic arrangement of a group of spinning points, and FIG. 1b is a corresponding plan view of a spinning nozzle package.

2a to 2d are plan views showing the arrangement of various discharge bores of a spinning nozzle package of rectangular and circular cross section.

FIGS. 3a and 3b are plan views of an embodiment of a spinning nozzle package with a rectangular and circular cross section, respectively, including insulation between the discharge bores for the different components.

FIG. 4 shows, on the top, AA of the spinning nozzle package of FIG. 3a;
A cross section is shown, with the corresponding temperature level change on the lower side.

5a and 5b show a plan view of the melt supply path and a BB section view of a, respectively, for a spinning nozzle package with a rectangular cross section.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spinning nozzle package 2 Cooling air 3 Matrix filament 4 Binder filament 7,8 Discharge bore 9 Heating box 10 Insulation bore 11 Insulation gap 12,13 Melt channel 16 Nozzle outlet narrow pipe 17 Annular gap 18 Small pipe 19 Deposition belt

 ──────────────────────────────────────────────────の Continuing on the front page (72) Norbert Goffing, Inventor: 66540 Neunkirchen, Lonestraße 64, Germany (72) Inventor, Yea Barabien, France Eff-68280 Sandoffen, Croix-en-Plaine, Roots de ゥSte, 8See (72) Inventor Peter Pfertner, Magellan Way, 5700-305, Raleigh, North Carolina, USA 27712 572-72 Inventor Georges Libre Eff-68000 Colmar, France Avignon Foch, 3 (72) Inventor Milton Williams 27713, North Carolina, USA High Driving Dalham, 4905 F-term (reference) 4L047 AA21 AA28 AB03 BA08 CB01 EA05

Claims (13)

[Claims] An apparatus for producing a spunbonded nonwoven fabric from a mixture of a high melting point thermoplastic matrix filament and a 5 to 50 ° C lower melting point thermoplastic binder filament, comprising a thermoplastic polymer compound. A spinning nozzle package having a melt channel and a discharge bore from the channel is surrounded by a heating box for heating the thermoplastic polymer compound, wherein the spinning nozzle package (1) is for a matrix filament. Melt channels for polymer compounds (1
2) and a discharge bore (8), and a melt channel (13) and a discharge bore (7) for the polymer compound for the binder filaments.
2) and (13) are thermally insulated from each other and a temperature sufficient to keep each of the polymer compound for the matrix filament (3) and the polymer compound for the binder filament (4) in the melt channel. An apparatus characterized in that it is individually assigned to each of (12) and (13). 2. The mutual thermal insulation of the melt channel (12) and the melt channel (13) runs between them and runs parallel to the melt channel (12,13), and a number of air-filled cavities. 2. The apparatus of claim 1, wherein the apparatus is performed by: 3. The thermal insulation of the melt channel (12) and the melt channel (13) mutually runs parallel to the melt channel (12,13) between them and is filled with solid insulator. 2. The apparatus of claim 1, wherein said cavity is formed by said cavity. 4. The apparatus according to claim 3, wherein the solid insulator comprises a ceramic material or a glass fiber cloth mat which is impregnated with a phenol resin or an epoxy resin and cured. 5. The apparatus according to claim 1, wherein the cross section of the spinning nozzle package is rectangular. 6. The melt channels (12, 13) and the discharge bores (8, 7) from these channels are isolated from one another according to the type of polymer compound when viewed in cross section of the spinning nozzle package (1). 6. The apparatus of claim 5, wherein the rows are arranged in rows. 7. The melt channels (12, 13) and the discharge bores (8, 7) from these channels are intermingled and homogeneously distributed in the cross section of the spinning nozzle package (1). The apparatus of claim 5, wherein 8. The spinning nozzle package (1) according to claim 1, wherein the cross section is circular.
Equipment. 9. In a cross section of the spinning nozzle package (1), a melt channel (12) for the polymer compound for the matrix filament and a discharge bore (8) are provided for the polymer compound for the binder filament. Device according to claim 8, characterized in that it is arranged concentrically with the melt channel (13) and the discharge bore (7). 10. A cross section of the spinning nozzle package (1), wherein a melt channel (12) and a discharge bore (8) for the polymer compound for the matrix filaments are provided.
9. Device according to claim 8, characterized in that the melt channel (13) and the discharge bore (7) for the polymer compound for the binder filaments are distributed irregularly and intermingled with one another. 11. A heating box (9) surrounding a spinning nozzle package (1) by means of an insulating gap (11) filled with air or solid insulation, wherein a melt channel (13) for the polymer compound for the binder filaments. 7. The apparatus according to claim 6, wherein the apparatus is isolated from the apparatus. 12. The melt channel (13) for the polymer compound for the binder filament is also arranged concentrically from the melt channel (12) for the polymer compound for the matrix filament which concentrically surrounds it. Device according to claim 9, characterized in that it is isolated by an insulating bore (10). 13. A melt channel (13) for the polymer compound for the binder filament is passed through a capillary (16) connected thereto, the lower section of which is filled with air or a solid insulator. Device according to claim 7 or 10, characterized in that a small tube (18) is formed which is surrounded by an annular gap (17).