Method of molding rubber articles
Abstract
Abstract A method of molding rubber articles in which uncured rubber is transferred from the chamber of a pot sprue plate into the cavities of a mold cavity plate by pot plunger pressure in a master press while the uncured rubber in the pot is maintained at a temperature considerably below curing temperature. The sprue plate retained by the master press is separated from the cavity plate, and the cavity plate then is removed from the master press. A mold lid with cavity pressure pads then is placed on the cavity plate with the cavities filled with uncured rubber. The mold lid and cavity plate as a mold unit is pressed in an auxiliary press to cure the rubber under pressure for the necessary time interval at the required curing temperature. the master press may serve a number of auxiliary presses. Fresh uncured rubber is added to the chamber of the master press sprue plate which is maintained at a temperature considerably below curing temperature, before each new cavity plate for a mold unit for one of the auxiliary presses is injected with uncured rubber. The procedure eliminates forming substantially any cured rubber scrap in producing molded articles.
Inventors
- 👤 H Church
Bibliographic Details
Claims Analysis
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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) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |