US3841147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for determining the inherent viscosity of a liquid
Assignee: Eastman Kodak Co
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Filing: 1973-02-05
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Granted: 1974-10-15
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Expires: 1993-02-05
Abstract
Abstract A method and apparatus is provided for use in a web producing system wherein a melted polymer resin is extruded to form the web, for automatically determining the inherent viscosity of the polymer resin based on the power consumed by the extruder. A number of physical operating conditions of the extruder are monitored and data produced therefrom which, after being converted into digital form, is used in a data processor for calculating inherent viscosity. The monitored conditions include power input to the drive motor for the extruder, the rotational speed of the extruder metering screw, the temperature of the barrel metal of the extruder, the temperature of the extruded product, and the filter pressure.
Inventors
- 👤 M Coil
- 👤 T Eder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:54
CPC Classifications
G; G01; G01N; G01N11/00; G01N11/02; G01N11/04; B; B29; B29C; B29C48/00; B29C48/25; B29C48/92; B29C2948/00; B29C2948/92; B29C2948/92009; B29C2948/92019; B29C2948/92047; B29C2948/92085; B29C2948/92095; B29C2948/922; B29C2948/92209; B29C2948/92323; B29C2948/92361; B29C2948/9238; B29C2948/9239; B29C2948/924; B29C2948/92428; B29C2948/92457; B29C2948/92466; B29C48/03; B29C48/07; B29C48/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
104 words
A machine method for determining the inherent viscosity of a liquid being processed in an extruder, said method comprising the steps of: 1. determining the value of actual power consumed by the extruder at a selected time during the extrusion process, and 2. converting the value of actual power into data representing the inherent viscosity of the liquid by a. determining the value of the theoretical power consumed by the extruder in extruding a liquid with a predetermined value of inherent viscosity, and b. comparing the value of the actual power consumed by the extruder with the determined value of the theoretical extruder power.
Claim 2
Dependent Claim
104 words
A machine method for determining the inherent viscosity of a liquid being processed in an extruder, said method comprising the steps of: 1. determining the value of actual power consumed by the extruder at a selected time during the extrusion process, and 2. converting the value of actual power into data representing the inherent viscosity of the liquid by a. determining the value of the theoretical power consumed by the extruder in extruding a liquid with a predetermined value of inherent viscosity, and b. comparing the value of the actual power consumed by the extruder with the determined value of the theoretical extruder power.
Claim 3
Dependent Claim
156 words
A machine method for determinG the inherent viscosity of a liquid resin, being processed in an extruder driven by an electrical motor, by means of an electronic data processor, comprising the steps of: detecting the electrical power being consumed by the motor at a selected time, detecting the operating speed of the motor, detecting the temperature at a selected point on the extruder barrel wall and the temperature of the liquid being extruded, converting the detected data to digital form, determining the actual power being consumed by the extruder from the digital data representing the detected electrical power, determining the theoretical power consumed by the extruder in extruding the liquid, when the liquid has a predetermined inherent viscosity, from the digital data representing the detected operating speed of the motor and the detected temperatures, and determining the inherent viscosity of the liquid as a function of the ratio of the determined actual power and theoretical power.
Claim 4
Dependent Claim
156 words
A machine method for determinG the inherent viscosity of a liquid resin, being processed in an extruder driven by an electrical motor, by means of an electronic data processor, comprising the steps of: detecting the electrical power being consumed by the motor at a selected time, detecting the operating speed of the motor, detecting the temperature at a selected point on the extruder barrel wall and the temperature of the liquid being extruded, converting the detected data to digital form, determining the actual power being consumed by the extruder from the digital data representing the detected electrical power, determining the theoretical power consumed by the extruder in extruding the liquid, when the liquid has a predetermined inherent viscosity, from the digital data representing the detected operating speed of the motor and the detected temperatures, and determining the inherent viscosity of the liquid as a function of the ratio of the determined actual power and theoretical power.
Claim 5
Dependent Claim
61 words
converting the value of actual power into data representing the inherent viscosity of the liquid by a. determining the value of the theoretical power consumed by the extruder in extruding a liquid with a predetermined value of inherent viscosity, and b. comparing the value of the actual power consumed by the extruder with the determined value of the theoretical extruder power.
Claim 6
Dependent Claim
61 words
converting the value of actual power into data representing the inherent viscosity of the liquid by a. determining the value of the theoretical power consumed by the extruder in extruding a liquid with a predetermined value of inherent viscosity, and b. comparing the value of the actual power consumed by the extruder with the determined value of the theoretical extruder power.
Claim 7
Dependent Claim
115 words
In a system for extruding a liquid polymer resin, including an extruder and a motor for driving the extruder, the combination comprising: means for determining the actual power being consumed by said motor in driving said extruder at a selected time, means for detecting the operating speed of said motor, means for detecting selected temperatures related to said extruder and said resin, means responsive to the detected motor operating speed and temperatures for determining a theoretical power consumption for said motor when said resin is assumed to have a selected inherent viscosity, and means responsive to the determined actual power and the determined theoretical power for generating data representing the inherent viscosity of said resin.
Claim 8
Dependent Claim
115 words
In a system for extruding a liquid polymer resin, including an extruder and a motor for driving the extruder, the combination comprising: means for determining the actual power being consumed by said motor in driving said extruder at a selected time, means for detecting the operating speed of said motor, means for detecting selected temperatures related to said extruder and said resin, means responsive to the detected motor operating speed and temperatures for determining a theoretical power consumption for said motor when said resin is assumed to have a selected inherent viscosity, and means responsive to the determined actual power and the determined theoretical power for generating data representing the inherent viscosity of said resin.
Claim 9
Dependent Claim
48 words
The system of claim 3 further including a filter for filtering the extruded resin and means for detecting the resin pressure in said filter, wherein the means for determining the said theoretical power consumption is further responsive to said means for detecting said resin pressure in said filter.
Claim 10
Dependent Claim
42 words
The system of claim 3 wherein the means for detecting temperatures further comprises: means for detecting the temperature at a selected point in the wall of said extruder, and means for detecting the temperature of said resin as it leaves said extruder.
Claim 11
Dependent Claim
53 words
The system of claim 3 wherein said means for detecting the operating speed of said motor further comprises: a tachometer mechanically coupled to said motor for generating a signal with a magnitude related to the value of said speed, nd means for converting the output of the tachometer output signal into digital signals.
Claim 12
Dependent Claim
40 words
The system of claim 3 wherein said motor is an electrical motor and the means for determining actual power further comprises: means for detecting the voltage applied to said motor, and means for detecting the current drawn by said motor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |