US3876736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of molding synthetic resins through high-pressure fluid cross-linking process and relevant apparatus
Assignee: Ikegai Corp
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Filing: 1972-09-18
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Granted: 1975-04-08
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Expires: 1992-09-18
Abstract
Abstract A method of molding a synthetic resin which comprises: kneading a mixture obtained by dispersing a cross-linking agent in said synthetic resin, while melting said resin, by applying such temperature and pressure as will not give rise to a cross-linking reaction, introducing the thus kneaded mixture into plural reaction chambers to effect cross-linking therein by applying an appropriate temperature and high pressure, and extruding the thus cross-linked material continuously from said reaction chambers through a head die for molding same; and a molding apparatus relevant to said method.
Inventors
- 👤 Mamoru Takiura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:21
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/46; B29C45/53; B29C45/54; B29C45/76; B29C2045/545
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
209 words
WITHIN A MAN REACTION CHAMBER HAVING A ROTATABLE AND AXIALLY RECIPROCATABLE PLASTICIZING SCREW THEREIN, FEEDING SAID RESIN AND AN AMOUNT OF CROSS-LINKING AGENT CAPABLE OF CROSS-LINKING SAID RESIN INTO SAID MAIN REACTION CHAMBER AND THEREIN ROTATING SAID SCREW AND SIMULTANEOUSLY IMPOSING A BACK PRESSURE ON SAID SCREW TO RESIST RETRACTING AXIAL MOVEMENT THEREOF SO THAT ROTATION OF SAID SCREW MELTS AND KNEADS SAID RESIN AND DISTRIBUTES THE CROSSLINKING AGENT UNIFORMLY THEREIN TO FORM A PLASTICIZED MIXTURE THEREOF AND FORWARDS THE PLASTICIZED MIXTURE INTO THE FORWARD END OF SAID MAIN REACTION CHAMBER, AND THE ACCUMULATION OF SAID PLASTICIZED MIXTURE IN SAID FORWARD END OF SAID MAIN REACTION CHAMBER FORCES SAID SCREW TO RETRACT IN SAID MAIN REACTION CHAMBER AGAINST SAID BACK PRESSURE, STOPPING THE ROTATION OF SAID SCREW WHEN SAID SCREW HAS RETRACTED TO A PREDETERMINED RETRACTED POSITION IN SAID MAIN REACTION CHAMBER AND CONTINUING TO APPLY SAID BACK PRESSURE ON SAID SCREW WHEREBY A CHARGE OF PLASTICIZED MATERIAL IS PRESENT IN THE FORWARD END OF SAID MAIN REACTION CHAMBER AND IS SUBJECTED TO SAID BACK PRESSURE, THE TEMPERATURE AND PRESSURE APPLIED ON SAID PLASTICIZED MIXTURE IN THE MAIN REACTION CHAMBER BEING INSUFFICIENT TO CAUSE THE CROSS-LINKING REACTION TO OCCUR SO THAT THE CHARGE OF PLASTICIZED MATERIAL IS NOT CROSS-LINKED,
Claim 2
Dependent Claim
209 words
WITHIN A MAN REACTION CHAMBER HAVING A ROTATABLE AND AXIALLY RECIPROCATABLE PLASTICIZING SCREW THEREIN, FEEDING SAID RESIN AND AN AMOUNT OF CROSS-LINKING AGENT CAPABLE OF CROSS-LINKING SAID RESIN INTO SAID MAIN REACTION CHAMBER AND THEREIN ROTATING SAID SCREW AND SIMULTANEOUSLY IMPOSING A BACK PRESSURE ON SAID SCREW TO RESIST RETRACTING AXIAL MOVEMENT THEREOF SO THAT ROTATION OF SAID SCREW MELTS AND KNEADS SAID RESIN AND DISTRIBUTES THE CROSSLINKING AGENT UNIFORMLY THEREIN TO FORM A PLASTICIZED MIXTURE THEREOF AND FORWARDS THE PLASTICIZED MIXTURE INTO THE FORWARD END OF SAID MAIN REACTION CHAMBER, AND THE ACCUMULATION OF SAID PLASTICIZED MIXTURE IN SAID FORWARD END OF SAID MAIN REACTION CHAMBER FORCES SAID SCREW TO RETRACT IN SAID MAIN REACTION CHAMBER AGAINST SAID BACK PRESSURE, STOPPING THE ROTATION OF SAID SCREW WHEN SAID SCREW HAS RETRACTED TO A PREDETERMINED RETRACTED POSITION IN SAID MAIN REACTION CHAMBER AND CONTINUING TO APPLY SAID BACK PRESSURE ON SAID SCREW WHEREBY A CHARGE OF PLASTICIZED MATERIAL IS PRESENT IN THE FORWARD END OF SAID MAIN REACTION CHAMBER AND IS SUBJECTED TO SAID BACK PRESSURE, THE TEMPERATURE AND PRESSURE APPLIED ON SAID PLASTICIZED MIXTURE IN THE MAIN REACTION CHAMBER BEING INSUFFICIENT TO CAUSE THE CROSS-LINKING REACTION TO OCCUR SO THAT THE CHARGE OF PLASTICIZED MATERIAL IS NOT CROSS-LINKED,
Claim 3
Independent Claim
31 words
A METHOD OF CROSS-LINKING AND EXTRUSION MOLDING A CROSSLINKABLE RESIN SELECTED FROM THE GROUP CONSISTING OF POLYOLEFIN RESIN AND POLYVINYL CHLORIDE RESIN, COMPRISING REPEATEDLY CARRYING OUT THE CYCLE OF STEPS OF:
Claim 4
Independent Claim
31 words
A METHOD OF CROSS-LINKING AND EXTRUSION MOLDING A CROSSLINKABLE RESIN SELECTED FROM THE GROUP CONSISTING OF POLYOLEFIN RESIN AND POLYVINYL CHLORIDE RESIN, COMPRISING REPEATEDLY CARRYING OUT THE CYCLE OF STEPS OF:
Claim 5
Dependent Claim
70 words
SIMULTANEOUSLY WITH THE RETRACTING MOVEMENT OF SAID SCREW, ADVANCING AT A CONSTANT MAXIMUM SPEED A RECIPROCATABLE FIRST PLUNGER IN A FIRST SECONDARY REACTION CHAMBER WHICH IS ISOLATED FROM SAID MAIN REACTION CHAMBER AND IS FILLED WITH A CHARGE OF PREVIOUSLY PLASTICIZED MATERIAL UNDERGOING CROSS-LINKING TO DISCHARGE THE LATTER CHARGE FROM SAID FIRST SECONDARY REACTION CHAMBER THROUGH A TRANSFER VALVE AND THENCE THROUGH AN EXTRUSION DIE TO FORM AN EXTRUSION MOLDING,
Claim 6
Dependent Claim
70 words
SIMULTANEOUSLY WITH THE RETRACTING MOVEMENT OF SAID SCREW, ADVANCING AT A CONSTANT MAXIMUM SPEED A RECIPROCATABLE FIRST PLUNGER IN A FIRST SECONDARY REACTION CHAMBER WHICH IS ISOLATED FROM SAID MAIN REACTION CHAMBER AND IS FILLED WITH A CHARGE OF PREVIOUSLY PLASTICIZED MATERIAL UNDERGOING CROSS-LINKING TO DISCHARGE THE LATTER CHARGE FROM SAID FIRST SECONDARY REACTION CHAMBER THROUGH A TRANSFER VALVE AND THENCE THROUGH AN EXTRUSION DIE TO FORM AN EXTRUSION MOLDING,
Claim 7
Dependent Claim
147 words
WHILE SAID FIRST PLUNGER IS STILL ADVANCING AT SAID CONSTANT SPEED, ADVANCING SAID SCREW AXIALLY IN SAID MAIN REACTION CHAMBER TO DISCHARGE THEREFROM THE FIRST-MENTIONED CHARGE OF PLASTICIZED MATERIAL AND FEEDING SAID FIRSTMENTIONED CHARGE OF PLASTICIZED MATERIAL THROUGH SAID TRANSFER VALVE INTO A SECOND SECONDARY REACTION CHAMBER WHICH IS ISOLATED FROM SAID EXTRUSION DIE AND HAS A RECIPROCATABLE SECOND PLUNGER THEREIN AND LOCATED CLOSE TO THE FORWARD END OF SAID SECOND SECONDARY REACTION CHAMBER, AND SIMULTANEOUSLY APPLYING A SECOND BACK PRESSURE ON SAID SECOND PLUNGER LESS THAN THE PRESSURE APPLIED TO ADVANCE SAID SCREW SO THAT THE PLASTICIZED MATERIAL FROM SAID MAIN REACTION CHAMBER FORCES SAID SECOND PLUNGER TO RETRACT AGAINST SAID SECOND BACK PRESSURE AND FILLS SAID SECOND SECONDARY REACTION CHAMBER AND IS CONTINUOUSLY SUBJECTED TO PRESSURE, AND TERMINATING ADVANCING MOVEMENT OF SAID SCREW WHEN IT REACHES A PREDETERMINED ADVANCED POSITION IN SAID MAIN REACTION CHAMBER,
Claim 8
Dependent Claim
147 words
WHILE SAID FIRST PLUNGER IS STILL ADVANCING AT SAID CONSTANT SPEED, ADVANCING SAID SCREW AXIALLY IN SAID MAIN REACTION CHAMBER TO DISCHARGE THEREFROM THE FIRST-MENTIONED CHARGE OF PLASTICIZED MATERIAL AND FEEDING SAID FIRSTMENTIONED CHARGE OF PLASTICIZED MATERIAL THROUGH SAID TRANSFER VALVE INTO A SECOND SECONDARY REACTION CHAMBER WHICH IS ISOLATED FROM SAID EXTRUSION DIE AND HAS A RECIPROCATABLE SECOND PLUNGER THEREIN AND LOCATED CLOSE TO THE FORWARD END OF SAID SECOND SECONDARY REACTION CHAMBER, AND SIMULTANEOUSLY APPLYING A SECOND BACK PRESSURE ON SAID SECOND PLUNGER LESS THAN THE PRESSURE APPLIED TO ADVANCE SAID SCREW SO THAT THE PLASTICIZED MATERIAL FROM SAID MAIN REACTION CHAMBER FORCES SAID SECOND PLUNGER TO RETRACT AGAINST SAID SECOND BACK PRESSURE AND FILLS SAID SECOND SECONDARY REACTION CHAMBER AND IS CONTINUOUSLY SUBJECTED TO PRESSURE, AND TERMINATING ADVANCING MOVEMENT OF SAID SCREW WHEN IT REACHES A PREDETERMINED ADVANCED POSITION IN SAID MAIN REACTION CHAMBER,
Claim 9
Dependent Claim
142 words
WHEN SAID FIRST PLUNGER REACHES A PREDETERMINED INTERMEDIATE ADVANCE POSITION IN SAID FIRST SECONDARY REACTION CHAMBER, REDUCING THE SPEED OF ADVANCING MOVEMENT OF SAID FIRST PLUNGER FROM SAID CONSTANT MAXIMUM SPEED TOWARD ZERO, AND SIMULTANEOUSLY INITIATING ADVANCING MOVEMENT OF SAID SECOND PLUNGER AT A SPEED INCREASING FROM ZERO TOWARD SAID CONSTANT MAXIMUM SPEED, AND SIMULTANEOUSLY SHIFTING SAID TRANSFER VALVE TO PLACE BOTH TO SAID FIRST AND SECOND SECONDARY REACTION CHAMBERS IN COMMUNICATION WITH SAID DIE WHEREBY THE EXTRUSION MOLDING CONTINUOUSLY BEING FORMED AT THIS TIME CONSISTS OF PLASTICIZED MATERIAL SUPPLIED FROM BOTH OF SAID SECONDARY REACTION CHAMBERS, THE SPEEDS OF THE FIRST AND SECOND PLUNGERS BEING COORDINATED WITH EACH OTHER SO THAT THE TOTAL AMOUNT OF PLASTICIZED MATERIAL EXTRUDED THROUGH THE DIE PER UNIT TIME IS SUBSTANTIALLY EQUAL TO THE AMOUNT EXTRUDED DURING SAID CONSTANT MAXIMUM SPEED ADVANCE OF SAID FIRST PLUNGER,
Claim 10
Dependent Claim
142 words
WHEN SAID FIRST PLUNGER REACHES A PREDETERMINED INTERMEDIATE ADVANCE POSITION IN SAID FIRST SECONDARY REACTION CHAMBER, REDUCING THE SPEED OF ADVANCING MOVEMENT OF SAID FIRST PLUNGER FROM SAID CONSTANT MAXIMUM SPEED TOWARD ZERO, AND SIMULTANEOUSLY INITIATING ADVANCING MOVEMENT OF SAID SECOND PLUNGER AT A SPEED INCREASING FROM ZERO TOWARD SAID CONSTANT MAXIMUM SPEED, AND SIMULTANEOUSLY SHIFTING SAID TRANSFER VALVE TO PLACE BOTH TO SAID FIRST AND SECOND SECONDARY REACTION CHAMBERS IN COMMUNICATION WITH SAID DIE WHEREBY THE EXTRUSION MOLDING CONTINUOUSLY BEING FORMED AT THIS TIME CONSISTS OF PLASTICIZED MATERIAL SUPPLIED FROM BOTH OF SAID SECONDARY REACTION CHAMBERS, THE SPEEDS OF THE FIRST AND SECOND PLUNGERS BEING COORDINATED WITH EACH OTHER SO THAT THE TOTAL AMOUNT OF PLASTICIZED MATERIAL EXTRUDED THROUGH THE DIE PER UNIT TIME IS SUBSTANTIALLY EQUAL TO THE AMOUNT EXTRUDED DURING SAID CONSTANT MAXIMUM SPEED ADVANCE OF SAID FIRST PLUNGER,
Claim 11
Dependent Claim
113 words
WHEN SAID FIRST PLUNGER REACHES A PREDETERMINED FINAL ADVANCE POSITION IN SAID FIRST SECONDARY REACTION CHAMBER, STOPPING ADVANCING MOVEMENT OF SAID FIRST PLUNGER, AND SIMULTANEOUSLY ESTABLISHING ADVANCING MOVEMENT OF SAID SECOND PLUNGER IN SAID SECOND SECONDARY REACTION CHAMBER AT SAID CONSTANT MAXIMUM SPEED, AND SIMULTANEOUSLY SHIFTING SAID TRANSFER VALVE TO PLACE SAID SECOND SECONDARY REACTION CHAMBER IN COMMUMICATION WITH SAID EXTRUSION DIE AND OUT OF COMMUNICATION WITH SAID MAIN REACTION CHAMBER AND TO PLACE SAID FIRST SECONDARY REACTION CHAMBER IN COMMUNICATION WITH SAID MAIN REACTION CHAMBER AND OUT OF COMMUNICATION WITH SAID EXTRUSION DIE, WHEREBY THE EXTRUSION MOLDING CONTINUOUES TO BE FORMED BY THE PLASTICIZED MATERIAL FROM SAID SECOND SECONDARY REACTION CHAMBER, AND
Claim 12
Dependent Claim
113 words
WHEN SAID FIRST PLUNGER REACHES A PREDETERMINED FINAL ADVANCE POSITION IN SAID FIRST SECONDARY REACTION CHAMBER, STOPPING ADVANCING MOVEMENT OF SAID FIRST PLUNGER, AND SIMULTANEOUSLY ESTABLISHING ADVANCING MOVEMENT OF SAID SECOND PLUNGER IN SAID SECOND SECONDARY REACTION CHAMBER AT SAID CONSTANT MAXIMUM SPEED, AND SIMULTANEOUSLY SHIFTING SAID TRANSFER VALVE TO PLACE SAID SECOND SECONDARY REACTION CHAMBER IN COMMUMICATION WITH SAID EXTRUSION DIE AND OUT OF COMMUNICATION WITH SAID MAIN REACTION CHAMBER AND TO PLACE SAID FIRST SECONDARY REACTION CHAMBER IN COMMUNICATION WITH SAID MAIN REACTION CHAMBER AND OUT OF COMMUNICATION WITH SAID EXTRUSION DIE, WHEREBY THE EXTRUSION MOLDING CONTINUOUES TO BE FORMED BY THE PLASTICIZED MATERIAL FROM SAID SECOND SECONDARY REACTION CHAMBER, AND
Claim 13
Dependent Claim
23 words
THEN RESTARTING ROTATION OF THE SCREW AND REPEATING STEPS 1 TO 5 WITH THE OPERATION OF THE FIRST AND SECOND CYLINDERS BEING REVERSED.
Claim 14
Dependent Claim
23 words
THEN RESTARTING ROTATION OF THE SCREW AND REPEATING STEPS 1 TO 5 WITH THE OPERATION OF THE FIRST AND SECOND CYLINDERS BEING REVERSED.
References Cited (Backward Citations)
US2505540A
Cited
US3158901A
Cited
US3288903A
Cited
US3591674A
Cited
US3706827A
Cited
US3660552A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |