US4115498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for molding articles from fibrous material
Assignee: Owens Corning
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Filing: 1976-02-27
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Granted: 1978-09-19
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Expires: 1996-02-27
Abstract
Abstract Method of continuously molding articles from a fibrous material containing a hardenable bonding material wherein a quantity of fibrous material is supplied to a forming member that engages the surface of the fibrous material and shapes the material into the desired cross-sectional shape. The exterior surface of the shaped fibrous material is then heated so that the bonding material on the exterior surface of the fibrous material cures to form a hard, tough skin on the exterior surface of the fibrous material. Then, additional heat is supplied to the fibrous material to cure the remaining uncured bonding material on the fibrous material so the fibrous material will be held in the desired shape by the cured bonding material.
Inventors
- 👤 Ronald E. Kissell
- 👤 Ulysses T. Gambill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:06
CPC Classifications
B; B28; B28B; B28B1/00; B28B1/52
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
136 words
A method of continuously producing fibrous glass pipe insulation comprising: a. continuously advancing an elongated strip of fibrous glass wool between a forming shoe and a mandrel longitudinally of the strip and axially of the mandrel, the wool having uncured binder on glass fibers thereof; b. continuously forming the strip into a longitudinally split hollow cylindrical shape by advancing it through the forming shoe to form it around the mandrel; c. continuously advancing the formed strip through a curing chamber wherein the binder is cured while the strip is confined in the hollow cylindrical shape; and d. continuously cooling the formed strip immediately before it enters the curing chamber to prevent partial curing of the binder in upstream portions of the strip in the forming shoe and thereby prevent build-up of binder on the forming shoe.
Claim 2
Independent Claim
136 words
A method of continuously producing fibrous glass pipe insulation comprising: a. continuously advancing an elongated strip of fibrous glass wool between a forming shoe and a mandrel longitudinally of the strip and axially of the mandrel, the wool having uncured binder on glass fibers thereof; b. continuously forming the strip into a longitudinally split hollow cylindrical shape by advancing it through the forming shoe to form it around the mandrel; c. continuously advancing the formed strip through a curing chamber wherein the binder is cured while the strip is confined in the hollow cylindrical shape; and d. continuously cooling the formed strip immediately before it enters the curing chamber to prevent partial curing of the binder in upstream portions of the strip in the forming shoe and thereby prevent build-up of binder on the forming shoe.
Claim 3
Dependent Claim
45 words
A method as claimed in claim 1 wherein the advancing of the strip is effected at least partially by rotating the mandrel while confining the strip in the cylindrical shape and preventing rotation thereof, the mandrel having helical driving means thereon for advancing the strip.
Claim 4
Dependent Claim
26 words
A method as claimed in claim 1 wherein the curing of the binder is effected by passing hot air through the wool of the formed strip.
Claim 5
Dependent Claim
23 words
A method as claimed in claim 3 wherein hot air is supplied to both the interior and the exterior of the formed strip.
Claim 6
Dependent Claim
38 words
A method as claimed in claim 3 wherein the exterior of the formed strip is skin cured by contact with an electrically heated ring before the passing of the hot air through the wool of the formed strip.
Claim 7
Dependent Claim
28 words
A method as claimed in claim 5 wherein the edges of the formed strip are skin cured by contact with a blade joined to the electrically heated ring.
Claim 8
Dependent Claim
24 words
A method as claimed in claim 1 including spraying a silicone lubricant and release agent on the strip before it enters the forming shoe.
Claim 9
Independent Claim
133 words
A method of continuously producing fibrous glass pipe insulation comprising: a. continuously advancing an elongated strip of fibrous glass wool between a forming shoe and a mandrel longitudinally of the strip and axially of the mandrel, the wool having uncured binder on glass fibers thereof; b. continuously forming the strip into a longitudinally split hollow cylindrical shape by advancing it through the forming shoe to form it around the mandrel; and c. continuously advancing the formed strip through a curing chamber wherein the binder is cured while the strip is confined in the cylindrical shape, the advancing of the strip being effected at least partially by rotating the mandrel while confining the strip in the split cylindrical shape and preventing rotation thereof, the mandrel having helical driving means thereon for advancing the strip.
Claim 10
Independent Claim
133 words
A method of continuously producing fibrous glass pipe insulation comprising: a. continuously advancing an elongated strip of fibrous glass wool between a forming shoe and a mandrel longitudinally of the strip and axially of the mandrel, the wool having uncured binder on glass fibers thereof; b. continuously forming the strip into a longitudinally split hollow cylindrical shape by advancing it through the forming shoe to form it around the mandrel; and c. continuously advancing the formed strip through a curing chamber wherein the binder is cured while the strip is confined in the cylindrical shape, the advancing of the strip being effected at least partially by rotating the mandrel while confining the strip in the split cylindrical shape and preventing rotation thereof, the mandrel having helical driving means thereon for advancing the strip.
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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) | 1981-09-18 | 1982-03-20 | 1982-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-18 | 1986-03-20 | 1986-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-18 | 1990-03-20 | 1990-09-19 | $7700.00 | Window Closed / Lapsed |