US3878285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus arrangement for high speed injection molding and curing of large, thick cross-section objects of elastomeric material
Assignee: EIDP Inc
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Filing: 1973-09-07
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Granted: 1975-04-15
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Expires: 1993-09-07
Abstract
Abstract A high speed combination for injection molding and rapidly uniformly curing relatively large, heavy objects having at least one cross-section greater than one-quarter inch formed of elastomeric material having a minimum Mooney viscosity M/S at 250*F. of 5-60 and scorch value of 10-40 minutes to 10-point rise, the combination involving rapid mastication and heating of precompounded solid feed material, rapid injection and curing to a point permitting removal of molded objects from a mold cavity without significant damage, an important feature being a specified arrangement for rapid controlled heating of the masticated stock to a very rapid curing temperature by restricting a dimension of at least one transverse cross-section of the stream of material being injected into a mold cavity, the heating occurring internally uniformly and without significant heat addition otherwise, or losses, by reason of maintaining the mold cavity and injection passageways which restrict flow at about the same temperature as the temperature of the injected material which is at a rapid curing temperature, the details of the specified features of the combination cooperating to provide injection and curing in a very short time to allow molding cycle times of less than about 4 minutes, suitable for commercial production of said objects, and operation of the combination at maximum efficiency.
Inventors
- 👤 Robert David Souffie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:43
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/0001; B29C45/17; B29C45/46; B29C45/47; B29C45/50; B29K; B29K2021/00
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
32 words
A PROCESS FOR HIGH SPEED INJECTION-MOLDING OF ELASTOMERIC ARTICLES WEIGHING AT LEAST FOUR POUNDS AND HAVING AT LEAST ONE CROSS-SECTIONAL DIMENSION GREATER THAN ONE-QUATER INCH, SAID PROCESS COMPRISING THE FOLLOWING SEQUENTIAL STEPS:
Claim 2
Dependent Claim
32 words
A PROCESS FOR HIGH SPEED INJECTION-MOLDING OF ELASTOMERIC ARTICLES WEIGHING AT LEAST FOUR POUNDS AND HAVING AT LEAST ONE CROSS-SECTIONAL DIMENSION GREATER THAN ONE-QUATER INCH, SAID PROCESS COMPRISING THE FOLLOWING SEQUENTIAL STEPS:
Claim 3
Dependent Claim
54 words
SUPPLYING AT A TEMPERATURE WITHIN THE RANGE OF ABOUT ROOM TEMPERATURE TO 150*F. AT LEAST 4 POUNDS OF SOLID, UNCURED, PRECOMPOUNDED, HEAT-CURABLE, ELASTOMERIC STOCK HAVING A MINIMUM MOONEY VISCOSITY VALUE, M/S, AT 250*F. OF ABOUT 5-60 AND A MOONEY SCORCH VALUE OF 10-40 MINUTES TO 10-POINT RISE TO THE BARREL OF AN INJECTION-MOLDING MACHINE;
Claim 4
Dependent Claim
54 words
SUPPLYING AT A TEMPERATURE WITHIN THE RANGE OF ABOUT ROOM TEMPERATURE TO 150*F. AT LEAST 4 POUNDS OF SOLID, UNCURED, PRECOMPOUNDED, HEAT-CURABLE, ELASTOMERIC STOCK HAVING A MINIMUM MOONEY VISCOSITY VALUE, M/S, AT 250*F. OF ABOUT 5-60 AND A MOONEY SCORCH VALUE OF 10-40 MINUTES TO 10-POINT RISE TO THE BARREL OF AN INJECTION-MOLDING MACHINE;
Claim 5
Dependent Claim
69 words
MASTICATING AND HEATING THE ELASTOMERIC STOCK IN THE BARREL WHILE TRANSPORTING IT FORWARD BY MEANS OF A SCREW; THE BARREL BEING HEATED TO SUCH A TEMPERATURE THAT THE ELASTOMERIC STOCK, WHICH IS HEATED BOTH BY THE WALLS OF THE BARREL AND BY THE MASTICATION, REACHES IN THE FORWARD END OF THE BARREL A UNIFORM TEMPERATURE OF ABOUT 220*-260*F.; THE MASTICATING AND HEATING TIME BEING LESS THAN ABOUT 60 SECONDS;
Claim 6
Dependent Claim
69 words
MASTICATING AND HEATING THE ELASTOMERIC STOCK IN THE BARREL WHILE TRANSPORTING IT FORWARD BY MEANS OF A SCREW; THE BARREL BEING HEATED TO SUCH A TEMPERATURE THAT THE ELASTOMERIC STOCK, WHICH IS HEATED BOTH BY THE WALLS OF THE BARREL AND BY THE MASTICATION, REACHES IN THE FORWARD END OF THE BARREL A UNIFORM TEMPERATURE OF ABOUT 220*-260*F.; THE MASTICATING AND HEATING TIME BEING LESS THAN ABOUT 60 SECONDS;
Claim 7
Dependent Claim
69 words
masticating and heating the elastomeric stock in the barrel while transporting it forward by means of a screw; the barrel being heated to such a temperature that the elastomeric stock, which is heated both by the walls of the barrel and by the mastication, reaches in the forward end of the barrel a uniform temperature of about 220*-260*F.; the masticating and heating time being less than about 60 seconds;
Claim 8
Dependent Claim
69 words
masticating and heating the elastomeric stock in the barrel while transporting it forward by means of a screw; the barrel being heated to such a temperature that the elastomeric stock, which is heated both by the walls of the barrel and by the mastication, reaches in the forward end of the barrel a uniform temperature of about 220*-260*F.; the masticating and heating time being less than about 60 seconds;
Claim 9
Dependent Claim
26 words
The process of claim 1 wherein a new batch of elastomeric stock is introduced into the barrel within 30 seconds after step (3) has been completed.
Claim 10
Dependent Claim
70 words
forcing the elastomeric stock through a nozzle and one or more restricted passages in the mold at a sufficient pressure to heat the stock to about 320*-400*F. into a mold cavity maintained at substantially the same temperature as the incoming rubber stock, the temperature of the stock exiting from the nozzle being within the range of 270* to 300*F., and the mold filling time being less than about 30 seconds;
Claim 11
Dependent Claim
70 words
forcing the elastomeric stock through a nozzle and one or more restricted passages in the mold at a sufficient pressure to heat the stock to about 320*-400*F. into a mold cavity maintained at substantially the same temperature as the incoming rubber stock, the temperature of the stock exiting from the nozzle being within the range of 270* to 300*F., and the mold filling time being less than about 30 seconds;
Claim 12
Dependent Claim
70 words
FORCING THE ELASTOMERIC STOCK THROUGH A NOZZLE AND ONE OR MORE RESTRICTED PASSAGES IN THE MOLD AT A SUFFICIENT PRESSURE TO HEAT THE STOCK TO ABOUT 320*-400*F. INTO A MOLD CAVITY MAINTAINED AT SUBSTANTIALLY THE SAME TEMPERATURE AS THE INCOMING RUBBER STOCK, THE TEMPERATURE OF THE STOCK EXITING FROM THE NOZZLE BEING WITHIN THE RANGE OF 270* TO 300*F.; AND THE MOLD FILLING TIME BEING LESS THAN ABOUT 30 SECONDS;
Claim 13
Dependent Claim
70 words
FORCING THE ELASTOMERIC STOCK THROUGH A NOZZLE AND ONE OR MORE RESTRICTED PASSAGES IN THE MOLD AT A SUFFICIENT PRESSURE TO HEAT THE STOCK TO ABOUT 320*-400*F. INTO A MOLD CAVITY MAINTAINED AT SUBSTANTIALLY THE SAME TEMPERATURE AS THE INCOMING RUBBER STOCK, THE TEMPERATURE OF THE STOCK EXITING FROM THE NOZZLE BEING WITHIN THE RANGE OF 270* TO 300*F.; AND THE MOLD FILLING TIME BEING LESS THAN ABOUT 30 SECONDS;
Claim 14
Dependent Claim
27 words
ALLOWING THE STOCK TO REMAIN IN THE MOLD CAVITY FOR A PERIOD OF ABOUT 20-90 SECONDS, DURING WHICH TIME THE STOCK IS BOTH SHAPED AND UNIFORMLY CURED.
Claim 15
Dependent Claim
27 words
ALLOWING THE STOCK TO REMAIN IN THE MOLD CAVITY FOR A PERIOD OF ABOUT 20-90 SECONDS, DURING WHICH TIME THE STOCK IS BOTH SHAPED AND UNIFORMLY CURED.
Claim 16
Dependent Claim
27 words
allowing the stock to remain in the mold cavity for a period of about 20-90 seconds, during which time the stock is both shaped and uniformly cured.
Claim 17
Dependent Claim
27 words
allowing the stock to remain in the mold cavity for a period of about 20-90 seconds, during which time the stock is both shaped and uniformly cured.
References Cited (Backward Citations)
US3660552A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |