GB2282393A - Producing spun-bonded webs - Google Patents
Producing spun-bonded webs Download PDFInfo
- Publication number
- GB2282393A GB2282393A GB9419685A GB9419685A GB2282393A GB 2282393 A GB2282393 A GB 2282393A GB 9419685 A GB9419685 A GB 9419685A GB 9419685 A GB9419685 A GB 9419685A GB 2282393 A GB2282393 A GB 2282393A
- Authority
- GB
- United Kingdom
- Prior art keywords
- filaments
- guide tubes
- web
- laydown
- take
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 claims abstract description 13
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 8
- 239000004416 thermosoftening plastic Substances 0.000 claims abstract description 4
- 229920000642 polymer Polymers 0.000 claims abstract description 3
- 238000009987 spinning Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 7
- 239000000155 melt Substances 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 230000002411 adverse Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
- D01G25/00—Lap-forming devices not integral with machines specified above
-
- 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
- D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
- D04H3/16—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic filaments produced in association with filament formation, e.g. immediately following extrusion
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
- Nonwoven Fabrics (AREA)
Abstract
A process for producing spunbonded webs comprises laying down at least some of the strands of drawn filaments coming from the take-off nozzles 2 at an angle. An apparatus for carrying out this process is also described in which guide tubes 3, through which the filaments are guided towards a belt 5, are disposed with an inclination wherein some of the guides are disposed at different angles. The webs are produced from thermoplastics polymers drawn from spinnerets 1. <IMAGE>
Description
Process for producing spunbonded webs
The invention relates to a process for producing
spunbonded webs and to an apparatus for carrying out the
process.
As is known for example from US Patent 3,692,618 or US
Patent 4,818,466, spunbonded webs can be produced by extru
sion of liquid melts of thermoplastics, e.g. polyolefins,
polyesters or polyamides, through multiple hole
spinnerets, cooling and drawing, for example by pneumatic
drawing via take-off nozzles using air, and laydown of
the resulting continuous filaments on a moving belt in
the form of a random web. These webs may subsequently be
consolidated, for example by needling. To obtain better
guidance of the drawn filaments, it is customary to guide the filaments coming in the form of strands from the
take-off nozzles downward through perpendicular guide
tubes toward the laydown apparatus where they are laid
down in the form of a web on a moving belt, for example with the aid of impingement panels. However, the linear
arrangement of the laydown systems, in which the indivi
dual laydown systems are disposed side by side in a row,
greatly restricts the capacity of such spinning plants.
True, there are processes in existence which utilize a plurality of successive rows of laydown systems to
increase the throughput, but there the row arrangement is
achieved by allocating to each row of laydown systems a
spinning plate or a row of spinning plates. This requires
either extremely complex spinning manifolds or even a plurality of separate spinning systems made up of an
extruder, pipework for the melt, and a spinning manifold.
Nor is it possible with these systems to use one row of
spinning plates to serve a plurality of laydown systems.
Moreover, the distances between the individual laydown
systems are very small. This limits the laydown footprint
associated with each laydown system. The individual
filament curtains come to interfere with- each other at
the boundary lines between the individual laydown sys
tems, which has an adverse effect on web properties.
It has now been found that the cited
disadvantages of existing spunbonded web processes can be avoided by guiding at least some of the filament strands downward at an inclined angle by means of inclined guide tubes. What was surprising here is that the running properties of the filaments are not adversely affected despite the inclined disposition of the guide tubes.
The invention accordingly provides a process for producing spunbonded webs by melting a thermoplastic polymer, spinning the melt downward through spinnerets to form filaments, cooling the filaments, drawing the cooled filaments by means of take-off nozzles in the form of filament strands, and passing the strands of drawn filaments through guide tubes to a laydown apparatus to lay them down in the form of a web, wherein at least some of the filaments are made by the guidance provided by the guide tubes to impinge on the laydown apparatus, for laydown in web form, at different angles CL relative to the perpendicular and inclined forward or rearward in the take-off direction of the web, adjacent filament strands having different angles a.
The present invention further provides an apparatus for producing spunbonded webs from thermoplastic polymers, comprising a melting means for the polymer, one or more downward leading spinneret orifices from which thermoplastic filaments are spun, a cooling zone for cooling the filaments, one or more take-off nozzles for the filaments, one or more downward leading filament-guide tubes downstream of the take-off nozzles, and a laydown apparatus for the filaments forming the spunbonded web, wherein at least some of the guide tubes are disposed at different angles a relative to the perpendicular and inclined forward or rearward in the take-off direction of the web, adjacent guide tubes having different angles a.
In a preferred process, the adjacent guide tubes are alternately inclined forward and rearward, so that the filament strands likewise impinge on the laydown apparatus alternately inclined forward and rearward, particularly preferably inclined forward by +a and rearward by -a. However, it is also possible for only every second guide tube to be inclined, with the inbetween guide tubes leading perpendicularly downward. It is further possible for the guide tubes to be inclined forward by different angles a and/or rearward by different angles CL. The angle CL ranges from about 1 to 50, depending on the nature of the web, the production speed, the length of the guide tubes, and the distance between the guide tubes. Preferably the angle a is set to not more than 20 , particularly preferably to not more than 100.
The at least partly inclined downward take-off direction of the filament strands according to the invention has the decisive advantage at laydown that it gives rise to two or more rows of laydown systems, and at the same time the distances between the laydown means of a row of laydown systems are greater. This makes it possible to lay down the filaments of a laydown apparatus over a broader area without affecting the other filaments. Additionally, this results in a more intensive crossing of the individual filaments or filament bundles and hence in improved mechanical properties and also a more uniform web.
Fig. 1 shows a diagram of a possible arrangement of the guide tubes in a spunbonded web plant. (1) designates the spinneret, (2) the take-off nozzles, (3) the forwardly and rearwardly inclined guide tubes, (cu) the angle of inclination of the guide tubes relative to the perpendicular, (4) impingement panels or deflectors, and (5) the moving belt on which the filaments are laid down in the form of a web. The arrow indicates the production direction. Depending on the web width, one or more spinnerets are arranged side by side in a row, each spinneret producing a web from about 10 to 100 cm in width, depending on the configuration of the plant.
The take-off nozzles may be disposed parallel to the spinnerets or else preferably be disposed perpendicularly on top of the guide tubes.
To increase the capacity of the spunbonded web plant further, it is also possible to arrange the spinnerets in a plurality of successive rows of spinning plates, each row of spinning plates being assigned at least two successive rows of laydown systems.
Claims (5)
1. A process for producing spunbonded webs by melting a thermoplastic polymer, spinning the melt downward through spinnerets to form filaments, cooling the filaments, drawing the cooled filaments by means of take-off nozzles in the form of filament strands, and passing the strands of drawn filaments through guide tubes to a laydown apparatus to lay them down in the form of a web, wherein at least some of the filaments are made by the guidance provided by the guide tubes to impinge on the laydown apparatus, for laydown in web form, at different angles CL relative to the perpendicular and inclined forward or rearward in the take-off direction of the web, adjacent filament strands having different angles cu.
2. The process of claim 1 wherein the filament strands impinge on the laydown apparatus alternately inclined forward and rearward.
3. The process of claim 1 wherein the angle of inclination a of the filament strands is not more than 200.
4. The process of claim 1 wherein the angle of inclination a of the filament strands is not more than 100.
5. Apparatus for producing spunbonded webs from thermoplastic polymers, comprising a melting means for the polymer, one or more downward leading spinneret orifices from which thermoplastic filaments are spun, a cooling zone for cooling the filaments, one or more takeoff nozzles for the filaments, one or more downward leading filament-guide tubes downstream of the take-off nozzles, and a laydown apparatus for the filaments forming the spunbonded web, wherein at least some of the guide tubes are disposed at different angles CL relative to the perpendicular and inclined forward or rearward in the take-off direction of the web, adjacent guide tubes having different angles CL.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPM196393 | 1993-09-30 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9419685D0 GB9419685D0 (en) | 1994-11-16 |
| GB2282393A true GB2282393A (en) | 1995-04-05 |
| GB2282393B GB2282393B (en) | 1997-08-27 |
Family
ID=3777292
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9419685A Expired - Fee Related GB2282393B (en) | 1993-09-30 | 1994-09-29 | Process and apparatus for producing spunbonded webs |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2282393B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1285381A (en) * | 1970-04-01 | 1972-08-16 | Toray Industries | Process for the manufacture of continous filaments |
| GB1584902A (en) * | 1977-02-16 | 1981-02-18 | Johns Manville | Method and apparatus for distribution of glass fibres |
| EP0122436A1 (en) * | 1983-03-19 | 1984-10-24 | Bayer Ag | Process and device for reducing the speed of flowing matter |
| GB2204886A (en) * | 1987-04-10 | 1988-11-23 | Neuberger Spa | Improved apparatus for the production of nonwoven fabrics |
-
1994
- 1994-09-29 GB GB9419685A patent/GB2282393B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1285381A (en) * | 1970-04-01 | 1972-08-16 | Toray Industries | Process for the manufacture of continous filaments |
| GB1584902A (en) * | 1977-02-16 | 1981-02-18 | Johns Manville | Method and apparatus for distribution of glass fibres |
| EP0122436A1 (en) * | 1983-03-19 | 1984-10-24 | Bayer Ag | Process and device for reducing the speed of flowing matter |
| GB2204886A (en) * | 1987-04-10 | 1988-11-23 | Neuberger Spa | Improved apparatus for the production of nonwoven fabrics |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2282393B (en) | 1997-08-27 |
| GB9419685D0 (en) | 1994-11-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20130929 |