Plastic and nonmetallic article shaping or treating: processes – With step of cleaning – polishing – or preconditioning...
Patent
1978-05-15
1979-03-27
Pavelko, Thomas P.
Plastic and nonmetallic article shaping or treating: processes
With step of cleaning, polishing, or preconditioning...
264297, 264325, 425339, B29H 501
Patent
active
041466004
ABSTRACT:
A process is disclosed for greatly improving the productivity of three-deck injection and compression and/or transfer molding presses used for making vulcanized rubber articles in which pressures are applied to both the upper and lower sets of vulcanizing molds for only short periods of time and one set of molds is locked together and continues to vulcanize the rubber parts while the other set is held open to permit unloading and reloading.
During each cycle each vulcanizing mold is held open for a period of time, such as 30 to 60 seconds, to permit unloading of the vulcanized rubber pieces, cleaning and/or coating of the mold surfaces, and reloading of the mold cavities as required while the other mold is locked in a closed position and heated to continue the curing of the rubber. After the open mold has been processed, the ram is advanced to close the mold and the mold is filled with rubber and then "bumped" as required one or more times and subjected to a high pressure, such as 1500 to 3000 pounds per square inch or more, over a short forming period, such as 20 to 30 seconds, to provide the uncured rubber with the desired shape and to eliminate entrapped gases. During the application of high pressure the power locking means are actuated to lock the freshly loaded mold in closed position and to unlock the other mold. The ram is then retracted to move the other mold to an open position for unloading, cleaning and reloading and the cycle is repeated.
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patent: 3809739 (1974-05-01), Gelin
Elly Robert A.
Foti Sam J.
Neff Perkins Company
Pavelko Thomas P.
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