Patent US4838774A successfully refreshed from Google Patents.
US4838774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for making a spun-filament fleece
Assignee: Reifenhaeuser GmbH and Co KG Maschinenenfabrik
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Filing: 1987-11-10
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Granted: 1989-06-13
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Expires: 2007-11-10
Abstract
Abstract The apparatus for making a spun-filament fleece from a stretched thermoplastic monofilament has a combined spinning unit made up of separate spinning units each having a plurality of spinning nozzles arranged in rows over a rectangular cross section, a blower shaft, a stretching shaft and a wire screen conveyor for the finished deposited fleece. The blower shaft is provided with air orifices for admission of stretching air simultaneously acting as a cooler. The stretching shaft has stretching shaft walls which are, if necessary, movable or adjustable with an accelerating device with a venturi nozzle like vertical cross section. At least two separate spinning units with separate groups of spinning nozzles are located above the blower shaft. At least one separating wall located between individual spinning units divides the blower shaft into separate portions for separate bands of monofilaments generated by the separate groups of spinning nozzles. The separate spinning units can be supplied with different thermoplastic materials from different extruders.
Inventors
- 👤 Hermann Balk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:15
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/08; D04H3/16; D01; D01D; D01D5/00; D01D5/08; D01D5/088
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
200 words
An apparatus for making a spun-filament fleece, comprising: a pair of separate spinnerets each having a plurality of spinning nozzles for emitting respective curtains of continuous thermoplastic filaments downwardly; means forming a cooling shaft below said spinnerets receiving said curtains of continuous thermoplastic filaments, said cooling shaft having walls respectively juxtaposed with outer sides of said curtains and extending therealong; a partition in said cooling shaft extending downwardly between said curtains, separating said curtains in said cooling shaft and juxtaposed with inner sides of said curtains; nozzle means formed on said walls for directing jets of cooling air into said shaft and inwardly along said curtains of thermoplastic filaments opposite and along said partition; a stretching shaft below said cooling shaft and formed with stretching-shaft walls narrowing to define a venturi-line air-accelerating stretching gap and thereafter widening downwardly from said gap, whereby said curtains merge in said stretching shaft and said thermoplastic filaments are stretched; an air-permeable receiving conveyor displaceable below said stretching shaft for receiving a fleece of said thermoplastic filaments depositing from said curtains; and an additional nozzle means formed on said partition and oriented to direct respective jets of cooling air outwardly against each of said curtains.
Claim 2
Independent Claim
200 words
An apparatus for making a spun-filament fleece, comprising: a pair of separate spinnerets each having a plurality of spinning nozzles for emitting respective curtains of continuous thermoplastic filaments downwardly; means forming a cooling shaft below said spinnerets receiving said curtains of continuous thermoplastic filaments, said cooling shaft having walls respectively juxtaposed with outer sides of said curtains and extending therealong; a partition in said cooling shaft extending downwardly between said curtains, separating said curtains in said cooling shaft and juxtaposed with inner sides of said curtains; nozzle means formed on said walls for directing jets of cooling air into said shaft and inwardly along said curtains of thermoplastic filaments opposite and along said partition; a stretching shaft below said cooling shaft and formed with stretching-shaft walls narrowing to define a venturi-line air-accelerating stretching gap and thereafter widening downwardly from said gap, whereby said curtains merge in said stretching shaft and said thermoplastic filaments are stretched; an air-permeable receiving conveyor displaceable below said stretching shaft for receiving a fleece of said thermoplastic filaments depositing from said curtains; and an additional nozzle means formed on said partition and oriented to direct respective jets of cooling air outwardly against each of said curtains.
Claim 3
Dependent Claim
17 words
The apparatus defined in claim 1, further comprising a single extruder connected to both of said spinnerets.
Claim 4
Dependent Claim
17 words
The apparatus defined in claim 1, further comprising a respective extruder connected to each of said spinnerets.
Claim 5
Independent Claim
215 words
An apparatus for making a spun-filament fleece, comprising: a pair of separate spinnerets each having a plurality of spinning nozzles for emitting respective curtains of continuous thermoplastic filaments downwardly; means forming a cooling shaft below said spinnerets receiving said curtains of continuous thermoplastic filaments, said cooling shaft having walls respectively juxtaposed with outer sides of said curtains and extending therealong; a partition in said cooling shaft extending downwardly between said curtains, separating said curtains in said cooling shaft and juxtapose with inner sides of said curtains; nozzle means formed on said walls for directing jets of cooling air into said shaft and inwardly against said curtains of thermoplastic filaments opposite and along said partition; a stretching shaft below said cooling shaft and formed with stretching-shaft walls narrowing to define a venturi-like air-accelerating stretching gap and thereafter widening downwardly from said gap, whereby said curtains merge in said stretching shaft to stretch said thermoplastic filaments, said stretching-shaft walls being movable relative to one another to adjust a width of said gap; an air-permeable receiving conveyor displaceable below said stretching shaft for receiving a fleece of said thermoplastic filaments depositing from said curtains; and an additional nozzle means formed on said partition and oriented to direct respective jets of cooling air outwardly against each of said curtains.
Claim 6
Independent Claim
215 words
An apparatus for making a spun-filament fleece, comprising: a pair of separate spinnerets each having a plurality of spinning nozzles for emitting respective curtains of continuous thermoplastic filaments downwardly; means forming a cooling shaft below said spinnerets receiving said curtains of continuous thermoplastic filaments, said cooling shaft having walls respectively juxtaposed with outer sides of said curtains and extending therealong; a partition in said cooling shaft extending downwardly between said curtains, separating said curtains in said cooling shaft and juxtapose with inner sides of said curtains; nozzle means formed on said walls for directing jets of cooling air into said shaft and inwardly against said curtains of thermoplastic filaments opposite and along said partition; a stretching shaft below said cooling shaft and formed with stretching-shaft walls narrowing to define a venturi-like air-accelerating stretching gap and thereafter widening downwardly from said gap, whereby said curtains merge in said stretching shaft to stretch said thermoplastic filaments, said stretching-shaft walls being movable relative to one another to adjust a width of said gap; an air-permeable receiving conveyor displaceable below said stretching shaft for receiving a fleece of said thermoplastic filaments depositing from said curtains; and an additional nozzle means formed on said partition and oriented to direct respective jets of cooling air outwardly against each of said curtains.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-12 | 1992-12-12 | 1993-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-12 | 1996-12-12 | 1997-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-12 | 2000-12-12 | 2001-06-13 | $7700.00 | Window Closed / Lapsed |