US3905734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous tube forming by melt blowing technique
Assignee: Beloit Corp
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Filing: 1973-12-26
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Granted: 1975-09-16
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Expires: 1993-12-26
Abstract
Abstract Apparatus for continuously making a tube of melt blown microfibers. The tubes are useful as filter elements. Melt blown microfibers deposited longitudinally upon a circumferential surface of a mandrel are axially withdrawn from one end of the mandrel tube. Weight is controlled by the rate at which a tube is drawn from a mandrel, the rate at which microfibers are deposited on the mandrel, the rate at which the mandrel revolves, and the like.
Inventors
- 👤 Eugene R Blair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:40
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/54; D04H1/56; D04H1/70; D04H1/76; Y; Y10; Y10S; Y10S55/00; Y10S55/05
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
129 words
Apparatus for continuously making a tube of melt blown microfibers comprising a. a mandrel having a circumferential surface, b. support means supporting said mandrel and adapted to permit said mandrel to rotate on its axis, c. means for rotatably driving said mandrel from one end thereof, d. means for continuously generating a generally planar configuration of melt blown microfibers, said means being adapted to deposit longitudinally upon a prechosen length of said circumferential surface a web of melt blow microfibers, and e. means for continuously withdrawing generally axially from the free end of said mandrel a tubular web of microfibers formed on said circumferential surface as said mandrel so rotates and as said mIcrofibers are so deposited, said withdrawing means revolving at substantially the same rate as said mandrel.
Claim 2
Dependent Claim
129 words
Apparatus for continuously making a tube of melt blown microfibers comprising a. a mandrel having a circumferential surface, b. support means supporting said mandrel and adapted to permit said mandrel to rotate on its axis, c. means for rotatably driving said mandrel from one end thereof, d. means for continuously generating a generally planar configuration of melt blown microfibers, said means being adapted to deposit longitudinally upon a prechosen length of said circumferential surface a web of melt blow microfibers, and e. means for continuously withdrawing generally axially from the free end of said mandrel a tubular web of microfibers formed on said circumferential surface as said mandrel so rotates and as said mIcrofibers are so deposited, said withdrawing means revolving at substantially the same rate as said mandrel.
Claim 3
Dependent Claim
19 words
The apparatus of claim 1 wherein said microfiber planar configuration is generally aligned with the axis of said mandrel.
Claim 4
Dependent Claim
71 words
The apparatus of claim 1 wherein said withdrawing means comprises an axially rotatably driven spindle adapted to wind convolutely thereupon in a collapsed, flattened form a tube of microfibers formed on said circumferential surface, the axis of said spindle being generally normal to the axis of said mandrel, said spindle being adapted to revolve end-over-end about the axis of said mandrel at a rate approximately the rotational speed of said mandrel.
Claim 5
Dependent Claim
55 words
The apparatus of claim 1 wherein said withdrawing means includes a forwardly conically tapered extension secured axially to said mandrel and a plurality of roller means positioned about said tapered extension in circumferentially spaced relationship, each said roller means being rotatably driven and adapted to remove from said mandrel a tube of microfibers formed thereon.
Claim 6
Dependent Claim
29 words
The apparatus of claim 3 further including drive means adapted to revolvably drive said spindle end-over-end at a rate substantially identical to the axial rotational speed of said mandrel.
Claim 7
Dependent Claim
65 words
The apparatus of claim 4 wherein each of said roller means is axially rotatably driven and wherein said plurality of roller means orbits about said tapered extension as said tapered extension axially revolves, the orbit rate being substantially identical to the rotational speed of said tapered extension, each of said roller means being yieldingly engaged with a different circumferential surface portion of said tapered extension.
References Cited (Backward Citations)
US2501584A
Cited
US3068517A
Cited
US3194645A
Cited
US3286007A
Cited
US3533884A
Cited
US3539666A
Cited
US3736086A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |