Patent US3659987A successfully refreshed from Google Patents.
US3659987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for forming and curing continuous elastomeric strip
Assignee: Ball Corp
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Filing: 1969-12-24
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Granted: 1972-05-02
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Expires: 1989-12-24
Abstract
Abstract Continuously molding heat curable thermoplastic material into a strip of definite desired cross-section shape and area with means including a cure die in the form of an elongated tube having an entrance end and an exit end and a cross-section similar in shape to the desired shape and greater in area than the cross-sectional area of the desired strip, said cure die including heating means, an extrusion die spaced from the entrance end of said tube and having a cross-sectional area less than the cross-sectional area of said cure die but greater than or equal to the desired crosssectional area of the strip, a lubricating die including means for dispensing lubricant upon said strip, said lubricating die connecting said forming die with said entrance end of said cure die and having a passageway defined therein with a crosssectional area greater than the cross-sectional area of said cure die.
Inventors
- 👤 Ronald G Mixell
- 👤 Daryl D Cerny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:43
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/02; B29C33/04; B29C35/00; B29C35/02; B29C35/04; B29C35/06; B29C48/00; B29C48/25; B29C48/94; B29C35/041; B29C2035/042; B29C2035/043; B29C37/00; B29C2037/92; B29C48/03; B29C48/09; B29K; B29K2021/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
191 words
Apparatus for continuously molding heat curable thermoplastic material into a strip of definite desired cross-sectional shape and area and for continuously vulcanizing same, comprising an extrusion die having a forming passageway defined therein which is 0 to 5 percent larger in cross-sectional area than the desired strip, feeding means connected to one end of said extrusion die and arranged to continuously force said material through said forming passageway, a lubricating die having a passageway defined therein which is 15 to 20 percent larger in cross-sectional area than the desired strip and axially connected to said extrusion die at thE opposite side of said extrusion die as is said feeding means, lubricating means perimetrically disposed within said lubricating die and arranged to apply a thin film of lubricant to the surface of said strip, a cure die having an elongated curing passageway defined therein which is 3 to 6 percent larger in cross-sectional area than the desired strip, said curing passageway being axially aligned with said lubricating passageway, and heat transfer means arranged to apply sufficient heat to said strip to substantially cure same while it is moving through said curing passageway.
Claim 2
Dependent Claim
191 words
Apparatus for continuously molding heat curable thermoplastic material into a strip of definite desired cross-sectional shape and area and for continuously vulcanizing same, comprising an extrusion die having a forming passageway defined therein which is 0 to 5 percent larger in cross-sectional area than the desired strip, feeding means connected to one end of said extrusion die and arranged to continuously force said material through said forming passageway, a lubricating die having a passageway defined therein which is 15 to 20 percent larger in cross-sectional area than the desired strip and axially connected to said extrusion die at thE opposite side of said extrusion die as is said feeding means, lubricating means perimetrically disposed within said lubricating die and arranged to apply a thin film of lubricant to the surface of said strip, a cure die having an elongated curing passageway defined therein which is 3 to 6 percent larger in cross-sectional area than the desired strip, said curing passageway being axially aligned with said lubricating passageway, and heat transfer means arranged to apply sufficient heat to said strip to substantially cure same while it is moving through said curing passageway.
Claim 3
Dependent Claim
28 words
Apparatus as set forth in claim 1 wherein said lubricating die includes a porous ring and means for providing lubricant under pressure through said ring to said passageway.
Claim 4
Dependent Claim
34 words
Apparatus as set forth in claim 1 wherein a stripper die having a passageway therethrough of a smaller cross-sectional area than said cure die is positioned at the exit end of said cure die.
Claim 5
Dependent Claim
39 words
Apparatus as set forth in claim 1 for shaping and curing curable thermoplastic material into continuous strips wherein said extrusion die is about 1 to 2 percent larger in cross-sectional area than the desired final size of the strip.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |