Direct digital control of rubber molding presses
US4344142A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 6, 1975 |
| Grant date | Aug 10, 1982 |
| Priority date | — |
| Expiry date | Aug 6, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/047
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Rubber-molding presses, which are closed manually upon installation of pieces of rubber compound, are opened automatically by a system which continuously calculates and recalculates the correct cure time and is actuated when the calculated cure time equals the elapsed cure time. An interval timer starts running from the time of mold closure, and the temperature within the mold cavity is measured often, typically every ten seconds. The temperature is fed to a computer which also is given access to the time-temperature cure data for the compound being molded, and the computer calculates and recalculates every time the data as to temperature is presented, until the total picture of time and temperature presents to the computer the time at which the material is fully cured. Then the computer signals for automatic opening of the mold press. Many presses can be controlled by a single computer, which still operates to recalculate the data about every ten seconds, and the time-temperature cure data for the compound can also be modified by information from a rheometer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.