US3870445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection molding machine controls
Assignee: Farrel Corp
•
Filing: 1974-01-21
•
Granted: 1975-03-11
•
Expires: 1994-01-21
Abstract
Abstract Method and apparatus for controlling the parameters of injection molding processes in a machine having a barrel with a plasticating chamber and a screw, rotatably and slidably disposed in said chamber, hopper means adjacent one end of said chamber communicating therewith and nozzle means disposed in the other end of said chamber communicating with a mold. Control of the injection molding process is achieved through an event recognition philosophy by sensing screw position, screw injection velocity, melt temperature, comparing the values at certain instances during the work cycle with known or desired values and using these values, changes of values and differences of values to monitor and initiate changes in the process parameters.
Inventors
- 👤 Peter Hold
- 👤 Angelo J Notte
- 👤 Marc A Rizzi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:38
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/76
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
359 words
A system for the adaptive control of a machine for injecting plasticated material into a mold, said machine having a heated barrel connected to the mold by a nozzle, means for inserting material into the barrel, a plasticating screw rotatably and slidably mounted in the barrel, and means, first, to rotate and retract said screw in order to plasticate the material and collect an amount thereof in front of the screw and, second, to force the plasticated material into the mold by a forward sliding thrust of the screw between charged and final positions, said system comprising: A. a first monitor for detecting the position of the screw and generating a signal relative thereto; B. a second monitor for detecting the sliding speed of the screw during injection and generating a signal relative thereto; C. a third member for detecting the temperature of the plasticated material and generating a signal relative thereto; D. means for setting predetermined standards for final screw position and for the temperature of the plasticated material and generating signals relative thereto; E. means for receiving and analyzing the speed monitor signal, and generating a timing signal when said speed signal indicates that the screw has substantially stopped; F. means for receiving and comparing the temperature monitor signal with the standard temperature signal, and generating a signal relative to the difference therein; G. means responsive to the timing signal for receiving and comparing the position monitor signal and the standard final position signal and generating a signal relative to the difference therein; H. means responsive to the position differential signal for Adjusting the charged screw position on recharge an amount which tends to reduce the final position differential signal to zero; I. a first regulator for adjusting the rotating speed of the screw during plastication; J. a second regulator for adjusting the sliding force which is applied to the screw during plastication; K. a third regulator for adjusting the supply of energy to the barrel heaters during plastication; and L. a selector, responsive to the temperature differential signal, to selectively activate the regulators in a manner which tends to reduce said temperature differential signal to zero.
Claim 2
Independent Claim
359 words
A system for the adaptive control of a machine for injecting plasticated material into a mold, said machine having a heated barrel connected to the mold by a nozzle, means for inserting material into the barrel, a plasticating screw rotatably and slidably mounted in the barrel, and means, first, to rotate and retract said screw in order to plasticate the material and collect an amount thereof in front of the screw and, second, to force the plasticated material into the mold by a forward sliding thrust of the screw between charged and final positions, said system comprising: A. a first monitor for detecting the position of the screw and generating a signal relative thereto; B. a second monitor for detecting the sliding speed of the screw during injection and generating a signal relative thereto; C. a third member for detecting the temperature of the plasticated material and generating a signal relative thereto; D. means for setting predetermined standards for final screw position and for the temperature of the plasticated material and generating signals relative thereto; E. means for receiving and analyzing the speed monitor signal, and generating a timing signal when said speed signal indicates that the screw has substantially stopped; F. means for receiving and comparing the temperature monitor signal with the standard temperature signal, and generating a signal relative to the difference therein; G. means responsive to the timing signal for receiving and comparing the position monitor signal and the standard final position signal and generating a signal relative to the difference therein; H. means responsive to the position differential signal for Adjusting the charged screw position on recharge an amount which tends to reduce the final position differential signal to zero; I. a first regulator for adjusting the rotating speed of the screw during plastication; J. a second regulator for adjusting the sliding force which is applied to the screw during plastication; K. a third regulator for adjusting the supply of energy to the barrel heaters during plastication; and L. a selector, responsive to the temperature differential signal, to selectively activate the regulators in a manner which tends to reduce said temperature differential signal to zero.
Claim 3
Independent Claim
359 words
A system for the adaptive control of a machine for injecting plasticated material into a mold, said machine having a heated barrel connected to the mold by a nozzle, means for inserting material into the barrel, a plasticating screw rotatably and slidably mounted in the barrel, and means, first, to rotate and retract said screw in order to plasticate the material and collect an amount thereof in front of the screw and, second, to force the plasticated material into the mold by a forward sliding thrust of the screw between charged and final positions, said system comprising: A. a first monitor for detecting the position of the screw and generating a signal relative thereto; B. a second monitor for detecting the sliding speed of the screw during injection and generating a signal relative thereto; C. a third member for detecting the temperature of the plasticated material and generating a signal relative thereto; D. means for setting predetermined standards for final screw position and for the temperature of the plasticated material and generating signals relative thereto; E. means for receiving and analyzing the speed monitor signal, and generating a timing signal when said speed signal indicates that the screw has substantially stopped; F. means for receiving and comparing the temperature monitor signal with the standard temperature signal, and generating a signal relative to the difference therein; G. means responsive to the timing signal for receiving and comparing the position monitor signal and the standard final position signal and generating a signal relative to the difference therein; H. means responsive to the position differential signal for Adjusting the charged screw position on recharge an amount which tends to reduce the final position differential signal to zero; I. a first regulator for adjusting the rotating speed of the screw during plastication; J. a second regulator for adjusting the sliding force which is applied to the screw during plastication; K. a third regulator for adjusting the supply of energy to the barrel heaters during plastication; and L. a selector, responsive to the temperature differential signal, to selectively activate the regulators in a manner which tends to reduce said temperature differential signal to zero.
Claim 4
Independent Claim
359 words
A system for the adaptive control of a machine for injecting plasticated material into a mold, said machine having a heated barrel connected to the mold by a nozzle, means for inserting material into the barrel, a plasticating screw rotatably and slidably mounted in the barrel, and means, first, to rotate and retract said screw in order to plasticate the material and collect an amount thereof in front of the screw and, second, to force the plasticated material into the mold by a forward sliding thrust of the screw between charged and final positions, said system comprising: A. a first monitor for detecting the position of the screw and generating a signal relative thereto; B. a second monitor for detecting the sliding speed of the screw during injection and generating a signal relative thereto; C. a third member for detecting the temperature of the plasticated material and generating a signal relative thereto; D. means for setting predetermined standards for final screw position and for the temperature of the plasticated material and generating signals relative thereto; E. means for receiving and analyzing the speed monitor signal, and generating a timing signal when said speed signal indicates that the screw has substantially stopped; F. means for receiving and comparing the temperature monitor signal with the standard temperature signal, and generating a signal relative to the difference therein; G. means responsive to the timing signal for receiving and comparing the position monitor signal and the standard final position signal and generating a signal relative to the difference therein; H. means responsive to the position differential signal for Adjusting the charged screw position on recharge an amount which tends to reduce the final position differential signal to zero; I. a first regulator for adjusting the rotating speed of the screw during plastication; J. a second regulator for adjusting the sliding force which is applied to the screw during plastication; K. a third regulator for adjusting the supply of energy to the barrel heaters during plastication; and L. a selector, responsive to the temperature differential signal, to selectively activate the regulators in a manner which tends to reduce said temperature differential signal to zero.
Claim 5
Dependent Claim
68 words
A system for the adaptive control of a machine for injecting plasticated material into a mold as described in claim 1 wherein the means for receiving and analyzing the speed monitor signal is constructed to generate a first timing signal when said speed signal indicates that the mold is full and to generate a second timing signal when said speed signal indicates that the screw has substantially stopped.
Claim 6
Dependent Claim
37 words
A system for the adaptive control of a machine for injecting plasticated material into a mold as described in claim 2 wherein the means for generating the temperature differential signal is responsive to the first timing signal.
Claim 7
Dependent Claim
48 words
A system for the adaptive control of a machine for injecting plasticated material into a mold as described in claim 1, further comprising means for continuously controlling the temperature of the barrel heaters to maintain a substantially adiabatic condition between the barrel and the interior of the barrel.
Claim 8
Dependent Claim
54 words
A system for the adaptive control of a machine for injecting plasticated material into a mold as described in claim 1 wherein the means for receiving and analyzing the speed monitor signal generates the timing signal upon the expiration of a predetermined period after said speed monitor signal indicates that the mold is full.
Claim 9
Dependent Claim
87 words
A system for the adaptive control of a machine for injecting plasticated material into a mold as described in claim 2, further comprising: A. means, responsive to the first timing signal, to adjust the forward pressure exerted by the screw during injection to a predetermined holding pressure level and to maintain said pressure level for a predetermined period; and B. means for initiating the resumption of the plasticating cycle, thereby retracting the screw to the charged position for subsequent injection cycling after the predetermined period has elapsed.
Claim 10
Dependent Claim
38 words
A system for the adaptive control of a machine for injecting plasticated material into a mold as described in claim 6 wherein the means for initiating resumption of the plasticating cycle is responsive to the second timing signal.
Claim 11
Dependent Claim
39 words
A system for the adaptive control of a machine for injecting plasticated material into a mold as described in claim 4 wherein the selector activates the regulators according to a priority sequence which maximizes the input of mechanical energy.
Claim 12
Dependent Claim
99 words
A system for the adaptive control of a machine for injecting plasticated material into a mold as described in claim 8 wherein the priority sequence for increasing the temperature of the plasticated material consists of sequentially activating the first, second and third regulators to, first, increase the rotating speed of the screw to obtain, if necessary, maximum compensation therefrom, second, if necessary, increase the sliding force which is applied to the screw during plastication to obtain maximum compensation therefrom, and, third, if necessary, increase the supply of energy to the barrel heaters during plastication to obtain maximum compensation therefrom.
Claim 13
Dependent Claim
99 words
A system for the adaptive control of a machine for injecting plasticated material into a mold as described in claim 8 wherein the priority sequence for decreasing the temperature of the plasticated material consists of sequentially activating the first, second and third regulators to, first, decrease the supply of energy to the barrel heaters during plastIcation to obtain, if necessary, maximum compensation therefrom, second, if necessary, decrease the sliding force which is applied to the screw during plastication to obtain maximum compensation therefrom, and, third, if necessary, decrease the rotating speed of the screw to obtain maximum compensation therefrom.
Claim 14
Independent Claim
444 words
A system for the adaptive control of a machine for injecting plasticated material into a mold, said machine having a heated barrel connected to the mold by a nozzle, means for inserting material into the barrel, a plasticating screw rotatably and slidably mounted in the barrel, and means to, first, rotate and retract the screw in order to plasticate the material and collect an amount thereof in front of the screw, and, second, to force the plasticated material into the mold by a forward sliding thrust of the screw between charged and final positions, said system comprising: A. a first monitor for detecting the position of the screw and generating a signal relative thereto; B. a second monitor for detecting the sliding speed of the screw during injection and generating a signal relative thereto; C. a third monitor for detecting the temperature of the plasticated material and generating a signal relative thereto; D. means for setting predetermined standards for final screw position and for the temperature of the plasticated material and generating signals relative thereto; E. means for receiving and analyzing the speed monitor signal, generating a first timing signal when said speed signal indicates that the mold is full, and generating a second timing signal when said speed signal indicates that the screw has substantially stopped; F. means responsive to the first timing signal for receiving and comparing the temperature monitor signal with the standard temperature signal, and generating a signal relative to the difference therein; G. means responsive to the second timing signal for receiving and comparing the position monitor signal and the standard final position signal and generating a signal relative to the difference therein; H. means responsive to the position differential signal for adjusting the charged screw position on recharge an amount which tends to reduce the final position differential signal to zero; I. a first regulator for adjusting the rotating speed of the screw during plastication; J. a second regulator for adjusting the sliding force which is applied to the screw during plastication; K. a third regulator for adjusting the supply of energy to the barrel heaters during plastication; L. a selector, responsive to the temperature differential signal, to selectively activate the regulators in a manner which tends to reduce said temperature differential signal to zero; M. means responsive to the first timing signal, to adjust the forward pressure exerted by the screw during injection to a predetermined holding pressure level and to maintain said pressure level for a predetermined period; and N. means for initiating resumption of the plasticating cycle, thereby retracting the screw to the charged position for subsequent injection cycling after the predetermined period has elapsed.
Claim 15
Independent Claim
444 words
A system for the adaptive control of a machine for injecting plasticated material into a mold, said machine having a heated barrel connected to the mold by a nozzle, means for inserting material into the barrel, a plasticating screw rotatably and slidably mounted in the barrel, and means to, first, rotate and retract the screw in order to plasticate the material and collect an amount thereof in front of the screw, and, second, to force the plasticated material into the mold by a forward sliding thrust of the screw between charged and final positions, said system comprising: A. a first monitor for detecting the position of the screw and generating a signal relative thereto; B. a second monitor for detecting the sliding speed of the screw during injection and generating a signal relative thereto; C. a third monitor for detecting the temperature of the plasticated material and generating a signal relative thereto; D. means for setting predetermined standards for final screw position and for the temperature of the plasticated material and generating signals relative thereto; E. means for receiving and analyzing the speed monitor signal, generating a first timing signal when said speed signal indicates that the mold is full, and generating a second timing signal when said speed signal indicates that the screw has substantially stopped; F. means responsive to the first timing signal for receiving and comparing the temperature monitor signal with the standard temperature signal, and generating a signal relative to the difference therein; G. means responsive to the second timing signal for receiving and comparing the position monitor signal and the standard final position signal and generating a signal relative to the difference therein; H. means responsive to the position differential signal for adjusting the charged screw position on recharge an amount which tends to reduce the final position differential signal to zero; I. a first regulator for adjusting the rotating speed of the screw during plastication; J. a second regulator for adjusting the sliding force which is applied to the screw during plastication; K. a third regulator for adjusting the supply of energy to the barrel heaters during plastication; L. a selector, responsive to the temperature differential signal, to selectively activate the regulators in a manner which tends to reduce said temperature differential signal to zero; M. means responsive to the first timing signal, to adjust the forward pressure exerted by the screw during injection to a predetermined holding pressure level and to maintain said pressure level for a predetermined period; and N. means for initiating resumption of the plasticating cycle, thereby retracting the screw to the charged position for subsequent injection cycling after the predetermined period has elapsed.
Claim 16
Dependent Claim
48 words
A system for the adaptive control of a machine for injecting plasticated material into a mold as described in claim 11, further comprising: means for continuously controlling the temperature of the barrel heaters to maintain a substantially adiabatic condition between the barrel and the interior of the barrel.
Claim 17
Dependent Claim
38 words
A system for the adaptive control of a machine for injecting plasticated material into a mold as described in claim 11 wherein the means for initiating resumption of the plasticating cycle is responsive to the second timing signal.
Claim 18
Dependent Claim
39 words
A system for the adaptive control of a machine for injecting plasticated material into a mold as described in claim 12 wherein the selector activates the regulators according to a priority sequence which maximizes the inpUt of mechanical energy.
Claim 19
Dependent Claim
99 words
A system for the adaptive control of a machine for injecting plasticated material into a mold as described in claim 14 wherein the priority sequence for increasing the temperature of the plasticated material consists of sequentially activating the first, second and third regulators to, first, increase the rotating speed of the screw to obtain, if necessary, maximum compensation therefrom, second, if necessary, increase the sliding force which is applied to the screw during plastication to obtain maximum compensation therefrom, and, third, if necessary, increase the supply of energy to the barrel heaters during plastication to obtain maximum compensation therefrom.
Claim 20
Dependent Claim
99 words
A system for the adaptive control of a machine for injecting plasticated material into a mold as described in claim 14 wherein the priority sequence for decreasing the temperature of the plasticated material consists of sequentially activating the first, second and third regulators to, first, decrease the supply of energy to the barrel heaters during plastication to obtain, if necessary, maximum compensation therefrom, second, if necessary, decrease the sliding force which is applied to the screw during plastication to obtain maximum compensation therefrom, and, third, if necessary, decrease the rotating speed of the screw to obtain maximum compensation therefrom.
Claim 21
Independent Claim
316 words
A system for the adaptive control of a machine for injecting plasticated material into a mold, said machine having a heated barrel connected to the mold by a nozzle, means for inserting material into the barrel, a plasticating screw rotatably and slidably mounted in the barrel, and means to, first, rotate and retract the screw in order to plasticate the material and collect an amount thereof in front of the screw, and, second, to force the plasticated material into the mold by a forward sliding thrust of the screw between charged and final positions, said system comprising: A. a first monitor for detecting the position of the screw and generating a signal relative thereto; B. a second monitor for detecting the sliding speed of the screw during injection and generating a signal relative thereto; C. means for setting a predetermined standard for final screw position and generating a signal relative thereto; D. means for receiving and analyzing the speed monitor signal, generating a first timing signal when said speed signal indicates that the mold is full, and generating a second timing signal when said speed signal indicates that the screw has substantially stopped; E. means responsive to the second timing signal for receiving and comparing the position monitor signal and the standard final position signal and generating a signal relative to the difference therein; F. means responsive to the position differential signal for adjusting the charged screw position on recharge an amount which tends to reduce the final position differential signal to zero; G. means responsive to the first timing signal to adjust the forward pressure exerted by the screw during injection to a predetermined holding pressure level and to maintain said pressure level for a predetermined period; and H. means for initiating resumption of the plasticating cycle, thereby retracting the screw to the charged position for subsequent injection cycling after the predetermined period has elapsed.
Claim 22
Independent Claim
316 words
A system for the adaptive control of a machine for injecting plasticated material into a mold, said machine having a heated barrel connected to the mold by a nozzle, means for inserting material into the barrel, a plasticating screw rotatably and slidably mounted in the barrel, and means to, first, rotate and retract the screw in order to plasticate the material and collect an amount thereof in front of the screw, and, second, to force the plasticated material into the mold by a forward sliding thrust of the screw between charged and final positions, said system comprising: A. a first monitor for detecting the position of the screw and generating a signal relative thereto; B. a second monitor for detecting the sliding speed of the screw during injection and generating a signal relative thereto; C. means for setting a predetermined standard for final screw position and generating a signal relative thereto; D. means for receiving and analyzing the speed monitor signal, generating a first timing signal when said speed signal indicates that the mold is full, and generating a second timing signal when said speed signal indicates that the screw has substantially stopped; E. means responsive to the second timing signal for receiving and comparing the position monitor signal and the standard final position signal and generating a signal relative to the difference therein; F. means responsive to the position differential signal for adjusting the charged screw position on recharge an amount which tends to reduce the final position differential signal to zero; G. means responsive to the first timing signal to adjust the forward pressure exerted by the screw during injection to a predetermined holding pressure level and to maintain said pressure level for a predetermined period; and H. means for initiating resumption of the plasticating cycle, thereby retracting the screw to the charged position for subsequent injection cycling after the predetermined period has elapsed.
Claim 23
Independent Claim
316 words
A system for the adaptive control of a machine for injecting plasticated material into a mold, said machine having a heated barrel connected to the mold by a nozzle, means for inserting material into the barrel, a plasticating screw rotatably and slidably mounted in the barrel, and means to, first, rotate and retract the screw in order to plasticate the material and collect an amount thereof in front of the screw, and, second, to force the plasticated material into the mold by a forward sliding thrust of the screw between charged and final positions, said system comprising: A. a first monitor for detecting the position of the screw and generating a signal relative thereto; B. a second monitor for detecting the sliding speed of the screw during injection and generating a signal relative thereto; C. means for setting a predetermined standard for final screw position and generating a signal relative thereto; D. means for receiving and analyzing the speed monitor signal, generating a first timing signal when said speed signal indicates that the mold is full, and generating a second timing signal when said speed signal indicates that the screw has substantially stopped; E. means responsive to the second timing signal for receiving and comparing the position monitor signal and the standard final position signal and generating a signal relative to the difference therein; F. means responsive to the position differential signal for adjusting the charged screw position on recharge an amount which tends to reduce the final position differential signal to zero; G. means responsive to the first timing signal to adjust the forward pressure exerted by the screw during injection to a predetermined holding pressure level and to maintain said pressure level for a predetermined period; and H. means for initiating resumption of the plasticating cycle, thereby retracting the screw to the charged position for subsequent injection cycling after the predetermined period has elapsed.
Claim 24
Independent Claim
316 words
A system for the adaptive control of a machine for injecting plasticated material into a mold, said machine having a heated barrel connected to the mold by a nozzle, means for inserting material into the barrel, a plasticating screw rotatably and slidably mounted in the barrel, and means to, first, rotate and retract the screw in order to plasticate the material and collect an amount thereof in front of the screw, and, second, to force the plasticated material into the mold by a forward sliding thrust of the screw between charged and final positions, said system comprising: A. a first monitor for detecting the position of the screw and generating a signal relative thereto; B. a second monitor for detecting the sliding speed of the screw during injection and generating a signal relative thereto; C. means for setting a predetermined standard for final screw position and generating a signal relative thereto; D. means for receiving and analyzing the speed monitor signal, generating a first timing signal when said speed signal indicates that the mold is full, and generating a second timing signal when said speed signal indicates that the screw has substantially stopped; E. means responsive to the second timing signal for receiving and comparing the position monitor signal and the standard final position signal and generating a signal relative to the difference therein; F. means responsive to the position differential signal for adjusting the charged screw position on recharge an amount which tends to reduce the final position differential signal to zero; G. means responsive to the first timing signal to adjust the forward pressure exerted by the screw during injection to a predetermined holding pressure level and to maintain said pressure level for a predetermined period; and H. means for initiating resumption of the plasticating cycle, thereby retracting the screw to the charged position for subsequent injection cycling after the predetermined period has elapsed.
Claim 25
Dependent Claim
38 words
A system for the adaptive control of a machine for injecting plasticated material into a mold as described in claim 17, wherein the means for initiating resumption of the plasticating cycle is responsive to the second timing signal.
Claim 26
Independent Claim
284 words
A system for the adaptive control of a machine for injecting plasticated material into a mold, said machine having a heated barrel connected to the mold by a nozzle, means for inserting material into the barrel, a plasticating screw rotatably and slidably mounted in the barrel, and means to, first, rotate and retract the screw in order to plasticate the material anD collect an amount thereof in front of the screw and, second, to force the plasticated material into the mold by a forward sliding thrust of the screw between charged and final positions, said system comprising: A. a first monitor for detecting the temperature of the plasticated material and generating a signal relative thereto; B. a second monitor for detecting the sliding speed of the screw during injection and generating a signal relative thereto; C. means for receiving and analyzing the speed monitor signal and generating a timing signal when said speed signal indicates that the mold is full; D. means for setting a predetermined standard for the temperature of the plasticated material and generating a signal relative thereto; E. means responsive to the timing signal for receiving and comparing the temperature monitor signal with the standard temperature signal, and generating a signal relative to the difference therein; F. a first regulator for adjusting the rotating speed of the screw during plastication; G. a second regulator for adjusting the sliding force which is applied to the screw during plastication; H. a third regulator for adjusting the supply of energy to the barrel heaters during plastication; and I. a selector responsive to the temperature differential signal to selectively activate the regulators in a manner which tends to reduce said temperature differential signal to zero.
Claim 27
Independent Claim
284 words
A system for the adaptive control of a machine for injecting plasticated material into a mold, said machine having a heated barrel connected to the mold by a nozzle, means for inserting material into the barrel, a plasticating screw rotatably and slidably mounted in the barrel, and means to, first, rotate and retract the screw in order to plasticate the material anD collect an amount thereof in front of the screw and, second, to force the plasticated material into the mold by a forward sliding thrust of the screw between charged and final positions, said system comprising: A. a first monitor for detecting the temperature of the plasticated material and generating a signal relative thereto; B. a second monitor for detecting the sliding speed of the screw during injection and generating a signal relative thereto; C. means for receiving and analyzing the speed monitor signal and generating a timing signal when said speed signal indicates that the mold is full; D. means for setting a predetermined standard for the temperature of the plasticated material and generating a signal relative thereto; E. means responsive to the timing signal for receiving and comparing the temperature monitor signal with the standard temperature signal, and generating a signal relative to the difference therein; F. a first regulator for adjusting the rotating speed of the screw during plastication; G. a second regulator for adjusting the sliding force which is applied to the screw during plastication; H. a third regulator for adjusting the supply of energy to the barrel heaters during plastication; and I. a selector responsive to the temperature differential signal to selectively activate the regulators in a manner which tends to reduce said temperature differential signal to zero.
Claim 28
Dependent Claim
48 words
A system for the adaptive control of a machine for injecting plasticated material into a mold as described in claim 19, further comprising: means for continuously controlling the temperature of the barrel heaters to maintain a substantially adiabatic condition between the barrel and the interior of the barrel.
Claim 29
Dependent Claim
39 words
A system for the adaptive control of a machine for injecting plasticated material into a mold as described in claim 20 wherein the selector activates the regulators according to a priority sequence which maximizes the input of mechanical energy.
Claim 30
Dependent Claim
99 words
A system for the adaptive control of a machine for injecting plasticated material into a mold as described in claim 21 wherein the priority sequence for increasing the temperature of the plasticated material consists of sequentially activating the first, second and third regulators to, first, increase the rotating speed of the screw to obtain, if necessary, maximum compensation therefrom, second, if necessary, increase the sliding force which is applied to the screw during plastication to obtain maximum compensation therefrom, and, third, if necessary, increase the supply of energy to the barrel heaters during plastication to obtain maximum compensation therefrom.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |